The theory of granular partitions (TGP) is a new approach to the understanding of ontologies and other classificatory systems. The paper explores the use of this new theory in the treatment of task-based clinical guidelines as a means for better understanding the relations between different clinical tasks, both within the framework of a single guideline and between related guidelines. We used as our starting point a DAML+OIL-based ontology for the WHO guideline for hypertension management, comparing this with related guidelines (...) and attempting to show that TGP provides a flexible and highly expressive basis for the manipulation of ontologies of a sort which might be useful in providing more adequate Computer Interpretable Guideline Models (CIGMs) in the future. (shrink)

This paper addresses automatic partitioning in complex reinforcement learning tasks with multiple agents, without a priori domain knowledge regarding task structures. Partitioning a state/input space into multiple regions helps to exploit the di erential characteristics of regions and di erential characteristics of agents, thus facilitating learning and reducing the complexity of agents especially when function approximators are used. We develop a method for optimizing the partitioning of the space through experience without the use of a priori domain knowledge. The (...) method is experimentally tested and compared to a number of other algorithms. As expected, we found that the multi-agent method with automatic partitioning outperformed single-agent learning. (shrink)

An important part of the Unified Medical Language System (UMLS) is its Semantic Network, consisting of 134 Semantic Types connected to each other by edges formed by one or more of 54 distinct Relation Types. This Network is however for many purposes overcomplex, and various groups have thus made attempts at simplification. Here we take this work further by simplifying the relations which involve the three Semantic Types – Diagnostic Procedure, Laboratory Procedure and Therapeutic or Preventive Procedure. We define operators (...) which can be used to generate terms instantiating types from this selected set when applied to terms designating certain other Semantic Types, including almost all the terms specifying clinical tasks. Usage of such operators thus provides a useful and economical way of specifying clinical tasks. The operators allow us to define a mapping between those types within the UMLS which do not represent clinical tasks and those which do. This mapping then provides a basis for an ontology of clinical tasks that can be used in the formulation of computer-interpretable clinical guideline models. (shrink)

Differences in the ability of students to judge images can be assessed by analyzing the individual preference order of images. To gain insights into potential heterogeneity in judgement of visual abstraction among students, we combine Bradley–Terry preference modeling and model-based recursive partitioning. In an experiment a sample of 1,020 high-school students ranked five sets of images, three of which with respect to their level of visual abstraction. Additionally, 24 art experts and 25 novices were given the same task, while their (...) eye movements were recorded. Results show that time spent on the task, the students’ age, and self-reported interest in visual puzzles had significant influence on rankings. Fixation time of experts and novices revealed that both groups paid more attention to ambiguous images. The presented approach makes the underlying latent scale of visual judgments quantifiable. (shrink)

This paper addresses weighting and partitioning in complex reinforcement learning tasks, with the aim of facilitating learning. The paper presents some ideas regarding weighting of multiple agents and extends them into partitioning an input/state space into multiple regions with di erential weighting in these regions, to exploit di erential characteristics of regions and di erential characteristics of agents to reduce the learning complexity of agents (and their function approximators) and thus to facilitate the learning overall. It analyzes, in reinforcement (...) learning tasks, di erent ways of partitioning a task and using agents selectively based on partitioning. Based on the analysis, some heuristic methods are described and experimentally tested. We nd that some o -line heuristic methods performed the best, signi cantly better than single-agent models. (shrink)

This article aims to rethink the trauma of the 1947 Partition of British India through the figure of the border. It is at the border that we can see how the present is as much constituted by the concentration of new realities that call for shifting frameworks of understanding as it is by past events that continue to haunt memory. It undertakes this task through a close reading of the trope of borders in Saadat Hasan Manto’s 1953 short story, (...) ‘Toba Tek Singh’. Partition fiction serves as a fruitful ground for developing new approaches to that history because, in part, literature is uniquely situated between representation and theory, between what a text represents and how it represents. In Manto’s story, the border is embodied in its central protagonist, Bishan Singh, who experiences an ontological struggle between being and belonging that exceeds the particular historical, geographical, and national context of the Partition. I suggest that the division of British India signaled a unique rupture within the subcontinent in which the creation of borders became the defining traumatic event of that history. This article thus moves away from the familiar nationalist rhetoric that has otherwise dominated conversations about the 1947 Partition of British India. It focuses instead on the geographical border as a conceptual figure that is at once spatially and corporeally oriented to a collective identity that exceeds nationalist frameworks of reference. (shrink)

We analyse the computational complexity of comparing informational structures. Intuitively, we study the complexity of deciding queries such as the following: Is Alice’s epistemic information strictly coarser than Bob’s? Do Alice and Bob have the same knowledge about each other’s knowledge? Is it possible to manipulate Alice in a way that she will have the same beliefs as Bob? The results show that these problems lie on both sides of the border between tractability (P) and intractability (NP-hard). In particular, we (...) investigate the impact of assuming information structures to be partition-based (rather than arbitrary relational structures) on the complexity of various problems. We focus on the tractability of concrete epistemic tasks and not on epistemic logics describing them. (shrink)

This study investigates the performance of 21 monolingual and 56 bilingual children aged 5;6-9;0 on German-LITMUS-sentence-repetition (SRT; Hamann et al., 2013) and nonword-repetition-tasks (NWRT; Grimm et al., 2014), which were constructed according to the LITMUS-principles (Language Impairment Testing in Multilingual Settings; Armon-Lotem et al., 2015). Both tasks incorporate complex structures shown to be cross-linguistically challenging for children with Specific Language Impairment (SLI) and aim at minimizing bias against bilingual children while still being indicative of the presence of language (...) impairment across language combinations. Given the great variability in bilingual language exposure and the potential effect of language experience on language performance in bilingual children, we examined whether background variables related to bilingualism, particularly, the degree language dominance as measured by relative amount of use and exposure, could compromise the diagnostic accuracy of the German-LITMUS-SRT and NWRT. We further investigated whether a combination of the two tasks provides better diagnostic accurracy. To address this, we used an unsupervised machine learning algorithm, the Partitioning-Around-Medoids (PAM), for deriving a clinical category for the children as ±language-impaired based on performance scores on SRT and/or NWRT while withholding information about their clinical status based on standardized assessment in L1/L2. Subsequently, we calculated diagnostic accuracy and investigated which background variables (age of onset, length of exposure, degree of language-dominance, socio-economic-status, and risk factors for SLI) best explained clinical-group-membership yielded from the PAM-analysis based on NWRT and/or SRT scores. Results show that although language-dominance influences the performance of bilingual typically-developing children, especially in the SRT, the diagnostic accuracy of the tools is not compromised by language dominance: while risk factors for SLI were significant predictors for clinical group membership in all models, language dominance did not contribute at all to explaining clinical cluster membership as typically-developing or SLI based on any of the combinations of the SRT and NWRT variables. Additionally, results confirm that a combination of SRT scored by correct target structure and the structurally more complex language-dependent part of the NWRT yields better diagnostic accuracy than single measures and is only sensitive for risk factors for SLI and not to dominance levels or SES. (shrink)

Given a basic conditional of the form, If A then C, individuals usually list three cases as possible: A and C, not‐A and not‐C, not‐A and C. This result corroborates the theory of mental models. By contrast, individuals often judge that the conditional is true only in the case of A and C, and that cases of not‐A are irrelevant to its truth or falsity. This result corroborates other theories of conditionals. To resolve the discrepancy, we devised two new (...) class='Hi'>tasks: the “collective” truth task, in which participants judged whether sets of assertions about a specific individual, such as: If A then C, not‐A, C, could all be true at the same time; and one in which participants judged the truth of conditional predictions about specific future events. The results consistently matched the three possibilities, thereby corroborating the model theory. They also showed a massive violation of the probability calculus in estimates of the probabilities of the four cases in the partition of conditionals (A and C, A and not‐C, not‐A and C, and not‐A and not‐C), which summed to over 200%. (shrink)

One of the important measures of quality of education is the performance of students in academic settings. Nowadays, abundant data is stored in educational institutions about students which can help to discover insight on how students are learning and to improve their performance ahead of time using data mining techniques. In this paper, we developed a student performance prediction model that predicts the performance of high school students for the next semester for five courses. We modeled our prediction system as (...) a multi-label classification task and used support vector machine (SVM), Random Forest (RF), K-nearest Neighbors (KNN), and Multi-layer perceptron (MLP) as base-classifiers to train our model. We further improved the performance of the prediction model using a state-of-the-art partitioning scheme to divide the label space into smaller spaces and used Label Powerset (LP) transformation method to transform each labelset into a multi-class classification task. The proposed model achieved better performance in terms of different evaluation metrics when compared to other multi-label learning tasks such as binary relevance and classifier chains. (shrink)

Languages that have determiners often have a rich inventory of them. In English, indefinite determiners include a(n), some, a certain, this, one, another, cardinals, partitives, the zero determiner of bare plurals (in some analyses), and, according to Horn 1999 and Giannakidou 2001, any. Despite the attention indefinites have received in the literature, characterizing what is common to all of them and what is specific to each is still an elusive task. This paper investigates the first three determiners in this list, (...) attempting to provide a semantic characterization that accounts for their distribution. (For pertinent discussion of issues that overlap to some extent with those taken up below, see Kamp and Bende-Farkas 2002, and for a discussion of the French versions of some and a certain, see Jayez and Tovena (this volume).) The Ds that concern us here share two characteristics: (i) they are indefinite, and (ii) they are existential when not in the scope of any operator or quantifier. As seen in [1], they may occur as pivots in existential there constructions, and therefore all three form weak DPs. (shrink)

ABSTRACT Nietzsche and Schlegel both write about practical topics with more than merely descriptive intent. Their intent is also practical insofar as it aims to alter the life of the reader, setting her a task: be thus! Each, however, also evinces skepticism about the propriety of such task setting. This skepticism is more general than the explicitly signaled audience partitioning in which each also engages: it is not that some readers will not be able to make use of the text (...) in the intended way, but that the task setting itself is misplaced. In this article I describe the character of the tasks that give rise to this skepticism, and argue that in both Schlegel's and Nietzsche's cases we get truer and more satisfying interpretations if we take them as disclaiming practical intent: though it is seductive to think we could attain the states they describe through our own effort, they systematically elude such pursuit. (shrink)

The ability to identify the mineral composition of rocks and soils is an important tool for the exploration of geological sites. Even though expert knowledge is commonly used for this task, it is desirable to create automated systems with similar or better performance. For instance, NASA intends to design robots that are sufficiently autonomous to perform this task on planetary missions. Spectrometer readings provide one important source of data for identifying sites with minerals of interest. Reflectance spectrometers measure intensities of (...) light reflected from surfaces over a range of wavelengths. Spectral intensity patterns may in some cases be sufficiently distinctive for proper identification of minerals or classes of minerals. For some mineral classes, carbonates for example, specific short spectral intervals are known to carry a distinctive signature. Finding similar distinctive spectral ranges for other mineral classes is not an easy problem. We propose and evaluate data-driven techniques in two stages: first, evaluating algorithms to identify which components are probably present in a given rock; second, trying to improve this classification by automatically searching for spectral ranges optimized for specific classes of minerals. In one set of studies, we partition the whole interval of wavelengths available in our data into sub-intervals, or bins, and use a genetic algorithm to evaluate a candidate selection of subintervals. As an alternative to these computationally expensive search techniques, we present an entropy-based heuristic that gives higher scores for wavelengths more likely to distinguish between classes. Results are presented for four different classes, showing reasonable improvements in identifying some, but not all, of the mineral classes tested. (shrink)

Plato’s Socrates says in the Phaedrus that we should “cut up each kind according to its species along its natural joints, and to try not to splinter any part, as a bad butcher might” (265e). In the Statesman Plato’s interlocutors make the similar suggestion that kinds should be divided from one another “limb by limb, like a sacrificial animal” (287c). This jointing metaphor is often used to illustrate the divisibility of the natural world into objective kinds or natural categories—such as (...) into particles like electrons, species, such as Homo sapiens, or even into sociological kinds like care-giver or psychological ones like fear. It has been thought that by dividing the world at its joints, we can lay bare the natural kinds; when we fail to so divide we splinter the world’s kinds like an incompetent butcher. In accordance with the metaphor, each bone in the animal body is likened to a category of things in the natural world. The claim that there is one natural set of joints at which we can physically separate the parts of the animal parallels the claim that there is a unique set of natural categories into which we should partition objects into species. Some, such as David Hull, say that this metaphor is “apt” (Hull 1989, 153) and others, like Ian Hacking, that it is “unsavory rubbish” (Hacking 1991, 111). Philip Kitcher is equally critical, writing that: “Plato gave us a vivid metaphor, suggesting that our classificatory task is like that of carving a beast at its joints. But that is just metaphor. I find it hard to give substance to the notion that nature is a beast with joints or that it comes with neat fenceposts that our scientific language must respect.”. (shrink)

The ability to identify the mineral composition of rocks and soils is an important tool for the exploration of geological sites. Even though expert knowledge is commonly used for this task, it is desirable to create automated systems with similar or better performance. For instance, NASA intends to design robots that are sufficiently autonomous to perform this task on planetary missions. Spectrometer readings provide one important source of data for identifying sites with minerals of interest. Reflectance spectrometers measure intensities of (...) light reflected from surfaces over a range of wavelengths. Spectral intensity patterns may in some cases be sufficiently distinctive for proper identification of minerals or classes of minerals. For some mineral classes, carbonates for example, specific short spectral intervals are known to carry a distinctive signature. Finding similar distinctive spectral ranges for other mineral classes is not an easy problem. We propose and evaluate data-driven techniques in two stages: first, evaluating algorithms to identify which components are probably present in a given rock; second, trying to improve this classification by automatically searching for spectral ranges optimized for specific classes of minerals. In one set of studies, we partition the whole interval of wavelengths available in our data into sub-intervals, or bins, and use a genetic algorithm to evaluate a candidate selection of subintervals. As an alternative to these computationally expensive search techniques, we present an entropy-based heuristic that gives higher scores for wavelengths more likely to distinguish between classes. Results are presented for four different classes, showing reasonable improvements in identifying some, but not all, of the mineral classes tested. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:“We Need to Cut the Neck!”Confronting Psychological and Moral Distress during Emergency Cricothyrotomy1Stephanie CooperEnoughYou didn’t die in the ER, but rather, began your inexorable demise. The last, first, and only words I ever heard you utter was the weak mewl “tight, tight” as the blood pressure cuff constricted your left arm. You were 98–years–old, bed–bound, at the end. Your world was already partitioning itself from us, your brain tunneling (...) down the uneven corridors of consciousness. A concretion of otoliths muffled your hearing, and fatigue burdened your ancient heart.Your name–band encircled your skinny ankle like a bird. Deformed by arthritis, you were caged within yourself, imprisoned by senescence. You could not declare yourself to us. Words disintegrated into moans and your grimace became animal.When you came back from x–ray—hypotensive with multiple neck fractures confirmed—you could speak no more. Your pulse slowed, your blood pressure plummeted. I jammed a gloved finger against your femoral pulse, faint and tired. [End Page E5]“What’s her DNR status?” I gravely asked your nurse.The DNR paperwork for once had arrived with the patient. “No CPR” she said with relief. But then the paperwork went on, forcing me—the waitress of tragedy—to serve up the hash of an impossible menu.As health care providers, we are all often tasked with performing contradictory actions: the pain of IV insertion followed by the morphine push, drilling deeper into broken bone in order to plate it, the inadvertent cracking of ribs during chest compressions. We sometimes must perform violent action in the hope of sustaining and resurrecting life. We are asked to perform the impossible, the contradictory, the painful. And sometimes the actions we must take catalyze an inexorable chain reaction of actions, which can end in death–prolonging and painful interventions that we did not intend.Although our culture may imagine that one can choose one’s meal at the end–of–life fast–food franchise of death, such is not the case. You can’t suddenly decide you’re a vegetarian. You can’t order the cheeseburger without the cheese—and we all are getting the burger, in the end. Ordering the heart–squeezing drugs without the CPR to circulate them, or the antibiotics without the fluid to counter dehydration, is like ordering the burger without the bun. Sometimes the possible choices are not necessarily realistic choices. You get served what you get served, and perhaps we should question the assumption that we have the ability to choose at all.Your DNR form proclaimed no CPR but then said that antibiotics and intubation were okay—the cheeseburger without the cheese. An unfortunate choice for you, me, and the rest of us, as your death menu led to a very unhappy meal.You were comatose. I stuck a tongue blade deep into your desiccated throat. You did not gag. This means I should have intubated you, but morally, I couldn’t. To what end? You were 98 years old, broken, moribund. If you hadn’t suffered multiple neck fractures, or if you were a vibrant elder who had just walked off Mt. Rainier, maybe the story would have been different. But you? I doubted that you truly had a chance of ever feeling joy again. You were somebody’s wife, somebody’s mother. I knew this step would lead to the domino of unstoppable steps. I refused to flog your corpse.I called your daughter Kay on her cell phone, told her that you were in critical condition and that she should come to the ER immediately. But how to begin to tell a daughter her mother is dying, let alone over a cell phone? Gentle but surreal and impersonal, my voice tried to tell your daughter that the interventions you needed would likely kill you. I have seen enough human suffering to know. To me, the choices were clear: death by nature’s irrefutable course, versus a more painful, protracted, and violent death by what we’d do to you.Kay arrived in a wheelchair and scooted up to your bedside. Like all daughters, she wasn’t ready for you... (shrink)

We study how people attend to and memorize endings of events that differ in the degree to which objects in them are affected by an action: Resultative events show objects that undergo a visually salient change in state during the course of the event (peeling a potato), and non‐resultative events involve objects that undergo no, or only partial state change (stirring in a pan). We investigate general cognitive principles, and potential language‐specific influences, in verbal and nonverbal event encoding and memory, (...) across two experiments with Dutch and Estonian participants. Estonian marks a viewer's perspective on an event's result obligatorily via grammatical case on direct object nouns: Objects undergoing a partial/full change in state in an event are marked with partitive/accusative case, respectively. Therefore, we hypothesized increased saliency of object states and event results in Estonian speakers, as compared to speakers of Dutch. Findings show (a) a general cognitive principle of attending carefully to endings of resultative events, implying cognitive saliency of object states in event processing; (b) a language‐specific boost on attention and memory of event results under verbal task demands in Estonian speakers. Results are discussed in relation to theories of event cognition, linguistic relativity, and thinking for speaking. (shrink)

This paper offers an explanation of how collaboration leads to abstract and flexible problem solving. We asked the individual and paired subjects to indicate 3/4 of 2/3 of the area of a square sheet of paper and found that (1) they primarily folded or partitioned the paper rather than algorithmically calculating the answer, (2) they strongly tendened to backtrack and confirm their proto‐plans on externalized traces such as creases on the paper, and (3) only the paired subjects shifted to the (...) mathematical strategy in their second trials. Based on these results, we propose that two factors, individuals' activeness in choosing and confirming the initial strategies and the frequent role exchange between task‐doing and monitoring in collaborative situations, interact in collaboration to generate various solutions differing in the degree of abstraction, which are then reflected upon by the participants to lead them to abstraction. (shrink)

We analyze the cognitive strategies underlying performance in the Number task, a Math game that requires both arithmetic fluency and mathematical creativity. In this game all elements in a set of numbers have to be used precisely once to create a target number with basic arithmetic operations. We argue that some instances of this game are NP complete, by showing its relation to the well-known Partition problem. We propose heuristics based on the distinction in forward and backward reasoning. The (...) Number Game is part of Math Garden, a popular online educational platform for practicing and monitoring math skills using innovations in computerized adaptive testing. These educational games generate enormous amounts of rich data on children's cognitive development. We found converging evidence for the use of forward proximity heuristics in the data of Math Garden, consisting of more than 20 million answers to 1,700 items. Item difficulties and the structure of correct answers were analyzed. (shrink)

In this article we present a new experimental paradigm: comparative visual search. Each half of a display contains simple geometrical objects of three different colors and forms. The two display halves are identical except for one object mismatched in either color or form. The subject's task is to find this mismatch. We illustrate the potential of this paradigm for investigating the underlying complex processes of perception and cognition by means of an eye‐tracking study. Three possible search strategies are outlined, discussed, (...) and reexamined on the basis of experimental results. Each strategy is characterized by the way it partitions the field of objects into “chunks.” These strategies are: (i) Stimulus‐wise scanning with minimization of total scan path length (a “traveling salesman” strategy), (ii) scanning of the objects in fixed‐size areas (a “searchlight” strategy), and (iii) scanning of object sets based on variably sized clusters defined by object density and heterogeneity (a “clustering” strategy). To elucidate the processes underlying comparative visual search, we introduce besides object density a new entropy‐based measure for object heterogeneity. The effects of local density and entropy on several basic and derived eye‐movement variables clearly rule out the traveling salesman strategy, but are most compatible with the clustering strategy. (shrink)

Foundational ontologies, central constructs in ontological investigations and engineering alike, are based on ontological categories. Firstly proposed by Aristotle as the very ur- elements from which the whole of reality can be derived, they are not easy to identify, let alone partition and/or hierarchize; in particular, the question of their number poses serious challenges. The late medieval philosopher Dietrich of Freiberg wrote around 1286 a tutorial that can help us today with this exceedingly difficult task. In this paper, I (...) discuss ontological categories and their importance for foundational ontologies from both the contemporary perspective and the original Aristotelian viewpoint, I provide the translation from the Latin into English of Dietrich's De origine II with an introductory elaboration, and I extract a foundational ontology–that is in fact a single-category one–from this text rooted in Dietrich's specification of types of subjecthood and his conception of intentionality as causal operation. (shrink)

Electoral control refers to attempts by an election's organizer to influence the outcome by adding/deleting/partitioning voters or candidates. The important paper of Bartholdi, Tovey, and Trick [1] that introduces control proposes computational complexity as a means of resisting control attempts: Look for election systems where the chair's task in seeking control is itself computationally infeasible.We introduce and study a method of combining two or more candidate-anonymous election schemes in such a way that the combined scheme possesses all the resistances to (...) control possessed by any of its constituents: It combines their strengths. From this and new resistance constructions, we prove for the first time that there exists a neutral, anonymous election scheme that is resistant to all twenty standard types of electoral control. (shrink)

At conceptual and linguistic levels of cognition, events are said to be represented in terms of abstract categories, for example, the sentence Jackie cut the bagel with a knife encodes the categories Agent (i.e., Jackie) and Patient (i.e., the bagel). In this paper, we ask whether entities such as the knife are also represented in terms of such a category (often labeled “Instrument”) and, if so, whether this category has a prototype structure. We hypothesized the Proto-instrument is a tool: a (...) physical object manipulated by an intentional agent to affect a change in another individual or object. To test this, we asked speakers of English, Dutch, and German to complete an event description task and a sentence acceptability judgment task in which events were viewed with more or less prototypical instruments. We found broad similarities in how English, Dutch, and German partition the semantic space of instrumental events, suggesting there is a shared concept of the Instrument category. However, there was no evidence to support the specific hypothesis that tools are the core of the Instrument category—instead, our results suggest the most prototypical Instrument is the direct extension of an intentional agent. This paper supports theoretical frameworks where thematic roles are analyzed in terms of prototypes and suggests new avenues of research on how instrumental category structure differs across linguistic and conceptual domains. (shrink)

Clustering is one of the most fundamental and essential data analysis tasks with broad applications. It has been studied in various research fields: data mining, machine learning, pattern recognition and in engineering, economics and biomedical data analysis. Headache is not a disease that typically shortens one’s life, but it can be a serious social as well as a health problem. Approximately 27 billion euros per year are lost through reduced work productivity in the European community. This paper is focused (...) on a new strategy based on a hybrid model for combining fuzzy partition method and maximum likelihood estimation clustering algorithm for diagnosing primary headache disorder. The proposed hybrid system is tested on two data sets for diagnosing headache disorder collected from Clinical Centre of Vojvodina in Serbia. (shrink)

This research examined choice behaviour and probability judgement in a counterintuitive reasoning problem called the Monty Hall problem (MHP). In Experiments 1 and 2 we examined whether learning from a simulated card game similar to the MHP affected how people solved the MHP. Results indicated that the experience with the card game affected participants' choice behaviour, in that participants selected to switch in the MHP. However, it did not affect their understanding of the objective probabilities. This suggests that there is (...) dissociation between implicit knowledge gained from the task and the explicit understanding as to why switching was the best strategy. In Experiment 3, the number of prizes and doors were manipulated to examine how participants construed the problem space of the MHP. Results revealed that participants partition the probability judgement to reflect the number of prizes over the number of unopened doors. (shrink)

The formulation of the conditional probability in classical tasks does not guarantee the effective transmission of the independence of the hit rate from the base rate. In these kinds of tasks, data are all available, but subjects are able to understand them in the specific meanings proper to a specialized language only if these are adequately transmitted. From this perspective, the partitive formulation should not be considered a facilitation, but rather, a way of effectively transmitting the conditional probability.Consider (...) the following two phrases:1 The death-rate among men is twice that for women.2 In the deaths registered last month there were twice as many men as women.Are these two different ways of saying the same or are these different events? In fact, they are different events. (Lindley 1985, p. 44). (shrink)

Student performance prediction aims to evaluate the grade that a student will reach before enrolling in a course or taking an exam. This prediction problem is a kernel task toward personalized education and has attracted increasing attention in the field of artificial intelligence and educational data mining. This paper provides a systematic review of the SPP study from the perspective of machine learning and data mining. This review partitions SPP into five stages, i.e., data collection, problem formalization, model, prediction, and (...) application. To have an intuition on these involved methods, we conducted experiments on a data set from our institute and a public data set. Our educational dataset composed of 1,325 students, and 832 courses was collected from the information system, which represents a typical higher education in China. With the experimental results, discussions on current shortcomings and interesting future works are finally summarized from data collections to practices. This work provides developments and challenges in the study task of SPP and facilitates the progress of personalized education. (shrink)

The claim that conceptual systems change is a platitude. That our conceptual systems are theory-laden is no less platitudinous. Given evolutionary theory, biologists are led to divide up the living world into genes, organisms, species, etc. in a particular way. No theory-neutral individuation of individuals or partitioning of these individuals into natural kinds is possible. Parallel observations should hold for philosophical theories about scientific theories. In this paper I summarize a theory of scientific change which I set out in considerable (...) detail in a book that I shall publish in the near future. Just as few scientists were willing to entertain the view that species evolve in the absence of a mechanism capable of explaining this change, so philosophers should be just as reticent about accepting a parallel view of conceptual systems in science evolving in the absence of a mechanism to explain this evolution. In this paper I set out such a mechanism. One reason that this task has seemed so formidable in the past is that we have all construed conceptual systems inappropriately. If we are to understand the evolution of conceptual systems in science, we must interpret them as forming lineages related by descent. In my theory, the notion of a family resemblance is taken literally, not metaphorically. In my book, I set out data to show that the mechanism which I propose is actually operative. In this paper, such data is assumed. (shrink)

To apply reinforcement learning to difficult classes such as real-environment learning, we need to use a method robust to perceptual aliasing problem. The exploitation-oriented methods such as Profit Sharing can deal with the perceptual aliasing problem to a certain extent. However, when the agent needs to select different actions at the same sensory input, the learning efficiency worsens. To overcome the problem, several state partition methods using history information of state-action pairs are proposed. These methods try to convert a (...) POMDP environment into an MDP environment, and thus they are sometimes very useful. However, their computation cost is very high especially in large state spaces. In contrast, memory-less approaches try to escape from the aliased states by outputting actions stochastically. However, these methods output actions stochastically even in unaliased states, and thus the learning efficiency is bad. If we desire to guarantee the rationality in POMDPs, it is efficient to output actions stochastically only in the aliased states and to output one action deterministically in the other unaliased states. Hence, to discriminate between aliased states and unaliased states, the utilization of χ² -goodness-of-fit test is proposed by Miyazaki et al. They point out that, in aliased states, the distributions of the state transitions by random search and a particular policy are different. This difference doesn't occur owing to non-deterministic actions. Hence, if the agent can collect enough samples to implement the test, the agent can distinguish between aliased states and unaliased states well. However, such a test needs a large amount of data, and it's a problem how the agent collects samples without worsening learning efficiency. If the agent uses random search in the course of learning, the learning efficiency worsens especially in unaliased states. Therefore, in this research, we propose a new method called Extended On-line Profit Sharing with Judgement (EOPSwJ) to detect important incomplete perception, which doesn't need large computation cost and numerous samples. We use two criterions for detecting important incomplete perceptions to attain a task. One is the rate of transitions to each state, and the other is the deterministic rate of actions. We confirm the availability of EOPSwJ using two simulations. (shrink)

This paper describes a cubic water tank equipped with a movable partition receiving various amounts of liquid used to represent joint probability distributions. This device is applied to the investigation of deductive inferences under uncertainty. The analogy is exploited to determine by qualitative reasoning the limits in probability of the conclusion of twenty basic deductive arguments (such as Modus Ponens, And-introduction, Contraposition, etc.) often used as benchmark problems by the various theoretical approaches to reasoning under uncertainty. The probability bounds (...) imposed by the premises on the conclusion are derived on the basis of a few trivial principles such as "a part of the tank cannot contain more liquid than its capacity allows", or "if a part is empty, the other part contains all the liquid". This stems from the equivalence between the physical constraints imposed by the capacity of the tank and its subdivisions on the volumes of liquid, and the axioms and rules of probability. The device materializes de Finetti's coherence approach to probability. It also suggests a physical counterpart of Dutch book arguments to assess individuals' rationality in probability judgments in the sense that individuals whose degrees of belief in a conclusion are out of the bounds of coherence intervals would commit themselves to executing physically impossible tasks. (shrink)

William Petty's work has usually been regarded as an epistemic break in the history of statistical and politico-economic thought. In this paper, I argue that Petty's statistical notions stemmed from the natural-historical techniques he originally implemented to manage the Down Survey. Following Bacon, who viewed the description of trades as a paramount branch of natural history, Petty approached the art of surveying itself as an object of natural-historical analysis. He partitioned the surveying work into individual tasks and implemented a (...) meticulous division of labour, employing hundreds of disbanded soldiers as surveyors and using questionnaires to calibrate the responses of his ‘instruments’, as he called his specialized workers. By borrowing these methods from natural history to organize surveying work, Petty was able to conceptualize Ireland as a political body defined by tables of aggregate data. I then compare the Down Survey with John Graunt's observations on the bills of mortality to show that both are representative of a particular style of natural history, aimed at describing the natural and political state of a circumscribed territory. I close by considering other manifestations of ‘territorial natural history’, indicating a continuity between this research tradition and the appearance of statistics in the British Isles. (shrink)

We live in a fragmented environment where spatial information is scattered across rooms, streets, neighborhoods, and cities. To point out the direction to a currently non-visible location or to find novel shortcuts across previously untraveled terrain we need to rely on our spatial memory by piecing the experienced fragments together in our head. This thesis is concerned with the question of how our spatial memory for navigable space (also called survey knowledge) is structured. Two major theoretical approaches are contrasted. Euclidean (...) map approaches assume that spatial locations are represented in a map-like, globally embedded, Euclidean format. Enriched graph approaches propose a partitioned, unit-wise representation of places connected in a network. In four consecutive studies participants learned spatial relations between objects spread across virtual environments and solved survey tasks afterward (e.g., pointing to object locations from memory). The observed effects imply that our memory of navigable space is stored in the format of an Enriched graph, a network of local places connected by directed links, without the necessity of a global calibration. Survey estimates seem to be constructed incrementally along the memorized connectivity and are generally transient. Additionally, a general reference direction can be acquired, a main direction that is propagated across a sub-group of multiple local places (i.e., a region) or that can cover the entire environment. Taken together, our representation of navigable space seems to be best described as an impossible puzzle where the memorized pieces and connections do not necessarily match up on a global scale. (shrink)

Two experiments were conducted for the derivation of psychophysical scales of the following audio descriptors: spectral centroid, spectral spread, spectral skewness, odd-to-even harmonic ratio, spectral deviation, and spectral slope. The stimulus sets of each audio descriptor were synthesized and independently controlled through appropriate synthesis techniques. Partition scaling methods were used in both experiments, and the scales were constructed by fitting well-behaving functions to the listeners' ratings. In the first experiment, the listeners' task was the estimation of the relative differences (...) between successive levels of a particular audio descriptor. The median values of listeners' ratings increased with increasing feature values, which confirmed listeners' abilities to estimate intervals. However, there was a large variability in the reliability of the derived interval scales depending on the stimulus spacing in each trial. In the second experiment, listeners had control over the stimulus values and were asked to divide the presented range of values into perceptually equal intervals, which provides a ratio scale. For every descriptor, the reliability of the derived ratio scales was excellent. The unit of a particular ratio scale was assigned empirically so as to facilitate qualitative comparisons between the scales of all audio descriptors. The construction of psychophysical scales based on univariate stimuli allowed for the establishment of cause-and-effect relations between audio descriptors and perceptual dimensions, contrary to past research that has relied on multivariate stimuli and has only examined the correlations between the two. Most importantly, this study provides an understanding of the ways in which the sensation magnitudes of several audio descriptors are apprehended. (shrink)

The goal of this article is twofold. First, it revises the historiographic partition proposed by John Deely in Four Ages of Understanding (2001) by arguing that the moment marking the beginning of philosophical Modernity has been vividly recorded in Descartes’ Meditations on First Philosophy with the experiment with the wax. Second, an upshot of this historical study is that it helps make sense of Deely’s somewhat iconoclastic use of the words “subject” and “subjectivity” to designate mind-independent worldly things. The (...) hope is that successfully accomplishing these twin tasks will give semiotic inquiry a better appreciation of its own history, as well as resources genial to furthering its ongoing development. (shrink)

The ability to identify the mineral composition of rocks and softs is an important tool for the exploration of geological sites. For instance, NASA intends to design robots that are sufficiently autonomous to perform this task on planetary missions. Spectrometer readings provide one important source of data for identifying sites with minerals of interest. Reflectance spectrometers measure intensities of light reflected from surfaces over a range of wavelengths. Spectral intensity patterns may in some cases be sufficiently distinctive for proper identification (...) of minerals or classes of minerals. For some mineral classes, carbonates for example, specific short spectral intervals are known to carry a distinctive signature. Finding similar distinctive spectral ranges for other mineral classes is not an easy problem. We propose and evaluate data-driven techniques that automatically search for spectral ranges optimized for specific minerals. In one set of studies, we partition the whole interval of wavelengths available in our data into sub-intervals, or bins, and use a genetic algorithm to evaluate a candidate selection of subintervals. As alternatives to this computationally expensive search technique, we present an entropy-based heuristic that gives higher scores for wavelengths more likely to distinguish between classes, as well as other greedy search procedures. Results are presented for four different classes, showing reasonable improvements in identifying some, but not all, of the mineral classes tested. (shrink)

Imagine walking into Starbuck's, ordering a double latte, meeting a friend, drinking up, and leaving. In the course of this simple event, you would engage in a wide variety of cognitive activities, among them problem solving, face recognition, speech production and perception, memory, and motor control. How does the mind – an apparently unitary entity – accomplish such a diversity of tasks? Is the mind partitioned into diverse mechanisms, each responsible for a different job? Or are more uniform, general‐purpose (...) mechanisms deployed for different cognitive purposes? Which tasks even count as the same, and which as different? Is visual recognition a single task, or are the mechanisms that recognize objects fundamentally distinct from those that recognize faces? Is speech produced and perceived by similar processes or by different ones? More generally, how, and how much, do such different processes interact? (shrink)

This cutting-edge book brings together eminent experts who propose ways to bridge cultural and developmental approaches to human psychology. The experts heed the call of cultural psychology to study different peoples around the world and to recognize that culture profoundly impacts how we think, feel, and act. At the same time, they also take seriously the developmental science perspective that humans everywhere share common life stage tasks and ways of learning. Doing what has not previously been done, the experts (...) integrate key insights and findings from cultural and developmental research. The result is a book brimming with new and creative syntheses for theory, research, and policy. This book is in step with a world where culturally diverse peoples interact with one another more than ever due to migration, worldwide media, and international trade and travel. With these interactions come changes to cultures and the psychological development of their members, and the implications for scholarship and policy are thoughtfully examined here. The book covers a wide range of related topics. It addresses the intersection of development and culture for psychological processes such as learning and memory, for key contexts of development such as family and civil society, for conceptions of self and identity, and for how the life course is partitioned including a focus on childhood and emerging adulthood.With its inclusion of diverse life phases, diverse topics, and experts from diverse disciplines and cultures, this volume speaks to a broad range of developmental and cultural issues. The synthesis of cultural and developmental approaches should be exciting and eye-opening to anyone with an interest in human psychology in today's global world. (shrink)

Architecture is about to enter its first magical phase: a time when buildings actively co-operate with their inhabitants; when objects know what they are, where they are, what is near them; when social and physical space lose their type coupling; when wall and partitions change with mood and task. As engineers and scientists explore how to digitse the world around us, the classical constraints of design, ruled so long by the physics of space, time, and materials, are starting to crumble. (...) Documents can be laid down in one place, automatically cloned, and a copy picked up in another. Meetings scheduled for 9am to 10am can be joined by latecomers at noon, who then participate in a captured form of the event and are ‘edited into’ the past. People on the West coast of the USA can participate, in a telepresent way, with their colleagues on the East coast, and hold a meeting against a virtual backdrop, such as a production line in their Taiwanese factory. Walls seem to dematerialise, remote objects can be touched virtually, shaped, passed through one another. Technology is moving inexorably so that being in one place at a time no longer need dominate how we work and play. Material boundaries are losing their meaning, and interface and information space are catch words that architects must master. -/- In this article I will discuss some of the theoretical ideas shaping our new conception of form, function, and interactivity. My view is that of a cognitive scientist interested in how cognition is distributed throughout our environment. Since the ground rules defining the structure of environments are changing, our very idea of how we are embedded in the world is changing. Architecture is at a new frontier. (shrink)

Ethics consultation has become an integral part of the fabric of U.S. health care delivery. This article summarizes the second edition of the Core Competencies for Health Care Ethics Consultation report of the American Society for Bioethics and Humanities. The core knowledge and skills competencies identified in the first edition of Core Competencies have been adopted by various ethics consultation services and education programs, providing evidence of their endorsement as health care ethics consultation (HCEC) standards. This revised report was prompted (...) by thinking in the field that has evolved since the original report. Patients, family members, and health care providers who encounter ethical questions or concerns that ethics consultants could help address deserve access to efficient, effective, and accountable HCEC services. All individuals providing such services should be held to the standards of competence and quality described in the revised report. (shrink)

Avicenna holds that since God has existed from all eternity and is immutable and impassible, he cannot come to have an attribute or feature that he has not had from all eternity. He also claims for the simultaneous causation. A puzzle arises when we consider God’s creating this world. If God is immutable and impassible, then his attributes associated with his creating this world are unchanging. So, God must have been creating the world from all eternity. But then God’s creative (...) act, one might object, seems to be no different from a matter of natural necessity. This is a threat to divine freedom, for God would then have no choice concerning his creative action. Anthony Ruffus and Jon McGinnis argue that this puzzle can be solved in such a way that Avicenna can consistently affirm divine freedom along with divine simplicity. They suggest that Naṣīr al-Dīn Ṭūsī’s interpretation might help to show that it is false that Avicenna’s God cannot choose absolutely. For it is still open to him to choose either to create eternally or to refrain from creating anything at all. Ruffus and McGinnis argue that since creating or not creating anything at all do not correspond to two distinct concepts, Avicenna’s account of divine simplicity, which denies any multiplicity in divine mind, is safeguarded along with divine freedom. I claim that God’s omnirationality requiring that he always acts for reasons is a serious threat to such an interpretation. (shrink)

The basis of Islamic alchemy and matter theory is found in the works of Jābir ibn Ḥayyān (d. 200/815). Jābir developed an element theory similar to Aristotle’s system. Still, he interpreted matter and substance differently by transferring the basis of the theory from elements to qualities. In Jābir’s system, qualities are more often expressed by the term “natures” (ṭabā’iʻ). In Jābir’s thought, four na- tures precede the four elements, and due to the combination of two different natures with the sub- (...) stance each time, four distinct elements with different qualities occur. In Jābir, the “primary bodies” of the natural world are no longer the four Empedoclean elements but the “four natures”; air, water, earth, and fire are made up of these natures. Thus, Jābir gave the four primary Aristotelian qualities the role of genuine elements by making them tangible, independent, and corporeal entities. According to Jābir, the operation of transforming (transmutation) of ajsād (‘bodies’) such as iron, copper, tin, and lead, which is the primary purpose of the Art of alchemy, into silver and gold is carried out within the framework of the science of mīzān. The core of this transformation is based on an idea of causality in which the four natures and their specific proportions and measures are at the center. With the idea of causality that allows chemical transformation, Jābir also succeeded in extending the possibility of transformation in alchemy from the inorganic world to the organic world to an extensive range of entities. This study will discuss Jābir’s thoughts on body, substance, and experimental causality by ex- amining Jābir’s corpus through primary sources. (shrink)