To study the development trend of embedded platforms in home appliances Internet of Things, an application of embedded Linux in the design of IoT gateway is designed. ARM microprocessor S3C2410, EM310 radio frequency module, and Ethernet DM9000A module are used to realize the home network information-processing platform. The platform utilizes existing network facilities, RF modules, and network interface modules to realize the interconnection of the home perception network through wireless or wired links. For experimental analysis, Ping the central server (...) from the IoT node B is set to twice: The first time ttl = 255 time = 1.9 ms, the second time: ttl = 255 time = 2.4 ms. After application verification, the system has the characteristics of low cost, small size, low power consumption, and vital ease of use. It can not only integrate the home Internet and the IoT gateway but also directly run application-layer communication protocols such as HTTP/mqtt between IoT nodes and Internet terminals. The design supports multi-hop communication and significantly increases the deployment range of IoT nodes without signal relay equipment, hence reducing the cost of IoT networking and the complexity of the network architecture. (shrink)

On December 9, 1999, VA Linux issued shares to the public and left over $900 million on the table for investors. In the prospectus, the investment banker Credit Suisse First Boston (CSFB) stated it would receive a 7% gross spread as its compensation for underwriting the shares. Yet the SEC alleges some investors paid enormous commissions to CSFB in the form of a kick-back immediately after obtaining the IPO shares. Hence, CSFB had an economic interest in the IPO and (...) there was not a full distribution of shares. This apparent violation of NASD Rule 2110 raises questions as to the credibility of the financial markets. (shrink)

Aiming at the vulnerability of wireless network, this paper proposed a method of WiFi penetration testing based on Kali Linux which is divided into four stages: preparation, information collection, simulation attack, and reporting. By using the methods of monitoring, scanning, capturing, data analysis, password cracking, fake wireless access point spoofing, and other methods, the WiFi network penetration testing with Kali Linux is processed in the simulation environment. The experimental results show that the method of WiFi network penetration testing (...) with Kali Linux has a good effect on improving the security evaluation of WiFi network. (shrink)

To attract complementary assets, firms that sponsor proprietary de facto compatibility standards must trade off control of the standard against the imperative for adoption. For example, Microsoft and Intel in turn gained pervasive adoption of their technologies by appropriating only a single layer of the standards architecture and encouraging competition in other layers. In reaction to such proprietary strategies, the open source movement relinquished control to maximize adoption. To illustrate this, we examine the rise of the Linux operating system (...) from 1995–2001, particularly the motivations of organizational buyers and suppliers of complementary assets, and Microsoft’s reaction to its success. (shrink)

This article analyses a specific piece of computer code, the Linux operating system kernel, as an example of how technical operationality figures in contemporary culture. The analysis works at two levels. First of all, it attempts to account for the increasing visibility and significance of code or software-related events. Second, it seeks to extend familiar concepts of performativity to include cultural processes in which the creation of meaning is not central, and in which processes of circulation play a primary (...) role. The analysis concentrates on the practices and patterns of circulation of Linux through versions, distributions, clones and reconfigurations. It argues that technical ‘culture-objects’ such as Linux take on a social existence within contemporary technological cultures because of the authorizing contexts in which the reading, writing and execution of code occur. The ‘force’ or performance of certain technical objects, their operationality, can be understood more as the stabilized nexus of diverse social practices, rules and personae than as a formal property of the objects themselves. (shrink)

This electronic document serves as a guide on how to get a LAMP stack running on a Google Compute Engine virtual machine instance running Debian.

Hacker communities of the 1970s and 1980s developed a quite characteristic work ethos. Its norms are explored and shown to be quite similar to those which Robert Merton suggested govern academic life: communism, universalism, disinterestedness, and organized scepticism. In the 1990s the Internet multiplied the scale of these communities, allowing them to create successful software programs like Linux and Apache. After renaming themselves the `open source software' movement, with an emphasis on software quality, they succeeded in gaining corporate interest. (...) As one of the main results, their `open' practices have entered industrial software production. The resulting clash of cultures, between the more academic CUDOS norms and their corporate counterparts, is discussed and assessed. In all, the article shows that software practices are a fascinating seedbed for the genesis of work ethics of various kinds, depending on their societal context. (shrink)

__Language Proof and Logic_ is available as a physical book with the software included on CD and as a downloadable package of software plus the book in PDF format. The all-electronic version is available from Openproof at ggweb.stanford.edu._ The textbook/software package covers first-order language in a method appropriate for first and second courses in logic. An on-line grading services instantly grades solutions to hundred of computer exercises. It is designed to be used by philosophy instructors teaching a logic course to (...) undergraduates in philosophy, computer science, mathematics, and linguistics. Introductory material is presented in a systematic and accessible fashion. Advanced chapters include proofs of soundness and completeness for propositional and predicate logic, as well as an accessible sketch of Godel's first incompleteness theorem. The book is appropriate for a wide range of courses, from first logic courses for undergraduates to a first graduate logic course. The software package includes four programs: Tarski's World 5.0, a new version of the popular program that teaches the basic first-order language and its semantics; Fitch, a natural deduction proof environment for giving and checking first-order proofs; Boole, a program that facilitates the construction and checking of truth tables and related notions ; Submit, a program that allows students to submit exercises done with the above programs to the Grade Grinder, the automatic grading service. Grade reports are returned to the student and, if requested, to the student's instructor, eliminating the need for tedious checking of homework. All programs are available for Windows, Macintosh and Linux systems. Instructors do not need to use the programs themselves in order to be able to take advantage of their pedagogical value. More about the software can be found at lpl.stanford.edu. The price of a new text/software package includes one Registration ID, which must be used each time work is submitted to the grading service. Once activated, the Registration ID is not transferable. (shrink)

An intriguing development in the realm of commercial software has arisen over the last decade, from highly improbable beginnings. From its inception in the ‘hacker ethic’, freeware has had a huge impact on IT businesses around the world, most strongly in the guise of its spin‐off, open source software. The eventual consequences are that, for example, more than 60% of all the servers on the World Wide Web are running the Apache open source system, and Linux, the open source (...) cousin of Unix, is challenging Microsoft’s products as the most popular business server operating system. Major IT users such as multinational banks, and major IT companies including IBM, Hewlett Packard, Sun Microsystems, Dell, Oracle, Informix, Intel, Fujitsu, AMD and Computer Associates are investing in and supporting Linux. In 1998, Netscape Communications made public the source code for its Netscape web browser. In 1999 Apple published the source for the ‘Darwin’ core of its Mac OS X. The Perl freeware programming language continues to gain popularity for web‐based applications. (shrink)

This article examines a community producing complex space technology. We attempt to highlight which aspects of the community’s activities can help democratize high-tech development while providing a context for similar cases involved in developing and manufacturing nonhigh-technological artefacts. We discuss how this has been made possible by using a technology-determined organizational approach based on the CubeSat open platform infrastructure, blending formal and hands-on education, open communication, specific recruitment and working practices, and a genuine passion for technology. We identify as critical (...) enablers for community-based collaborative development of space technology the open-source architecture standard called CubeSat Design Specifications, the modularization of work in subsystems and between different organizations, and the open and participatory approach work tasks distribution and decision making. Moreover, we argue that the digital/informational aspect of this technology allows the community to implement organizational practices that resemble how open-source movements over the internet produce complex digital artefacts like Wikipedia or Linux. ESTCube can shed light on community-driven complex technology development, providing lessons on what a democratized version of high technology would resemble and how open and digitalized technology can help develop the capacities of a community. (shrink)

Wie unterscheidet sich ein Betriebssystem wie bspw. Linux von einer Mikrobe? Der Beitrag untersucht, wie technische Objekte im »Jahrhundert der Biologie« aufgefasst werden. Anhand des Werks von Gilbert Simondon wird gefragt, welche Existenzweisen biotechnische Objekte aufweisen. Die Prozesse von Abstraktion und Konkretisierung, die auf dem Feld der Synthetischen Biologie stattfinden, können einen Weg aufweisen, diese Fragen zu beantworten. How does a computer operating system such as Linux differ from a microbe? This paper explores how technical objects are envisaged (...) in the »century of biology«. Via the work of Gilbert Simondon, it asks what modes of existence biotechnical objects will display. The processes of abstraction and concretisation taking place in the field of synthetic biology offer one way to address these questions. (shrink)

Every year thousands of computers deemed obsolete by companies upgrading to newer models are kept out of landfills by organizations like World Computer Exchange 1 which recycle them to schools in developing countries. It is possible to set up at a very low cost, clusters of recycled PCs, using Linux software to substantially reduce the cost of establishing school‐based community Internet centers. In the case of such an implementation in Goa, India by a WCE partner‐NGO the key to its (...) success has been collaboration between the NGO and the private sector to encourage the growth of local Linux support skills and with the government sector ‐ the Goa State Education Department ‐ to ensure the acceptance of Linux in the curriculum, and the provision of teacher training. The Goa Schools Computers project 2 project provides an example of how low initial costs of infrastructure and linkages between different stakeholders can result in cost savings of up to 60% over a conventional community Internet center thereby increasing their chances for financial viability. (shrink)

This article helps to clarify and articulate the ideological, legal, and ethical attitudes regarding software as intellectual property (IP). Computer software can be viewed as IP from both ethical and legal perspectives. The size and growth of the software industry suggest that large profits are possible through the development and sale of software. The rapid growth of the open source movement, fueled by the development of the Linux operating system, suggests another model is possible. The large number of unauthorized (...) copies of software programs suggests that many people do not believe in laws regarding software copyright. There are many and varied views of software as IP, even within the information systems (IS) profession. In this article, four distinct subgroups of IS professionals are identified. The article describes the four subgroups and their respective ideological views on software ownership; it explores the subgroups' attitudes regarding software laws; and finally, it explains the ethical positions embraced by each subgroup. (shrink)

Application of the reliability of repairable systems on solving problems from constructing production systems takes an important place in the process of finding the optimal solution among the suggested system choices. The basic hypothesis when using the reliability of the repairable systems is that every machine is representing a component, a fact that is debatable when talking about technical sciences. However, considering the second assumption of the stationary process, the function of the availability is introduced. It represents the measure between (...) the reliability and the benefit of maintaining the components and the system as a whole one. An additional and the last reason for analyzing constructing machine as a whole one has an economic reason. From the aspect of the total cost and the capacity of the system, the function of the availability is catching more and more impact in the process of determinating the total cost in bill of quantities as the most important part of tender documents. Until former works, techno-economic optimisation usually ran over when choosing the system of the construction machines. In the work, there are shown the methodologies for gathering and analyzing the indicators of availabilities per unit of a company's machine park. The time of demission and reparation have been investigated among 34 components in the period of 6 years. Based on the obtained result for different conditions of machine exploitation and facilities, it is suggested the methodology of the future behaviour of the corresponding within the model optimization availability of constructing production system with the aim of eliminating extra criterion. The suggested model takes in consideration the total cost of the components when they are functional, and when they are not. This kind of approach enables the one who take choices decision of the height of profits, in the lenght of work in function of the projection of cash flow and managing with real indicators of functioning the system at the project level. Given the fact that the maintanance policy of machines is based on availability, and not on reliability of components, with the aim of maximizing the availability of different budget scenarios, a logical approach to the selection of the objective function in the terms of management of construction production systems is to minimize costs for a given availability of system constructing machinery is based on the use of historical data base with the values of the operational availability of components, conditions in which they function, in the process of forecasting the project availability for projects that follow. Ranking variant solutions is the result of the adopted function of the aim as a consequence due to enlargement methods of availability for serial parallel systems with the associated restrictions. For optimal system availability is taken a value that belongs to minimal total cost. However, it is predicted that after the end of the financial year, the real and projected indicators of system functions get compared to each other. Informational support to the proposed model is informational company system, which was built in the PHP programming language on the Linux software platform, and with data based in My SQL. The suggested model is tested on the system for the production and embedding bitumen bound materials on the specific project. Obtained results confirm the assumptions used in work. (shrink)

According to its supporters open source software is more secure and reliable than proprietary code, and even tends to foster more innovation. Its technical superiority can be linked to the ongoing peer review process which typifies the open source model. In addition, programs such as Linux offer a potential challenge to the hegemony of Microsoft. Open source holds out the possibility of restraining platform leaders such as Microsoft from acting opportunistically. Some even argue that the open source code model (...) is ethically superior to the proprietary model because of its transparency. Given these economic and social benefits, should government policy makers intervene, by tilting the playing field to open source programs? Would such government intervention truly be welfare‐enhancing? Before answering that question we note that some of the presumed technical and economic benefits of open source software are open to question. At the same time, the claims of moral superiority or social desirability are inflated and discount incentives necessary for software development. But even if this software were technically and morally superior, there is still no basis for government intervention. Our position is simple: the invisible hand of the market and not the visible hand of government should decide the fate of open source code. There is no identifiable market failure for the government to fix nor is there any plausible policy justification for giving open source software preferential treatment. (shrink)

Policy Interaction Graph Analysis is a Host-based Intrusion Detection tool that uses Linux MAC Mandatory access control policy to build the licit information flow graph and uses a detection policy defined by the administrator to extract illicit behaviour from the graph. The main limitation of this tool is the generation of a huge signature base of illicit behaviours; hence, this leads to the use of huge memory space to store it. Our primary goal in this article is to reduce (...) this memory space while keeping the tool’s efficiency in terms of intrusion detection rate and false generated alarms. First, the interactions between the two nodes of the graph were grouped into a single interaction. The notion of equivalence class was used to classify the paths in the graph and was compressed by using a genetic algorithm. Such an approach showed its efficiency compared to the approach proposed by Pierre Clairet, by which the detection rate obtained was 99.9%, and no false-positive with a compression rate of illicit behaviour signature database reached 99.44%. Having these results is one of the critical aspects of realizing successful host-based intrusion detection systems. (shrink)

What is there not to like about “openness”? The premise seems to have virtue, particularly in the space of critique of government. From totalitarianism through to oligarchies, it can be argued that it is opacity and secrecy that have contributed to abuses of power for many centuries. In other spaces, the notion has caught hold. In several scientific fields, it appears that a lack of openness can lead to misconduct and in some cases a slowness that may cost lives. In (...) the humanities, we might say that its absence fosters insularity. In computer software production, open-source paradigms have led to remarkable developments such as the Linux kernel and allowed us to see the inner machinations of the code that is.. (shrink)

Evolutionary applications of game theory present one of the most pedagogically accessible varieties of genuine, contemporary theoretical biology. We present here Oyun (OY-oon, http://charlespence.net/oyun), a program designed to run iterated prisoner’s dilemma tournaments, competitions between prisoner’s dilemma strategies developed by the students themselves. Using this software, students are able to readily design and tweak their own strategies, and to see how they fare both in round-robin tournaments and in “evolutionary” tournaments, where the scores in a given “generation” directly determine contribution (...) to the population in the next generation. Oyun is freely available, runs on Windows, Mac, and Linux computers, and the process of creating new prisoner’s dilemma strategies is both easy to teach and easy for students to grasp. We illustrate with two interesting examples taken from actual use of Oyun in the classroom. (shrink)

Hierarchies occur widely in evolving self‐organizing ecological, biological, technological, and social networks, but detecting and comparing hierarchies is difficult. Here we present a metric and technique to quantitatively assess the extent to which self‐organizing directed networks exhibit a flow hierarchy. Flow hierarchy is a commonly observed but theoretically overlooked form of hierarchy in networks. We show that the ecological, neurobiological, economic, and information processing networks are generally more hierarchical than their comparable random networks. We further discovered that hierarchy degree has (...) increased over the course of the evolution of Linux kernels. Taken together, our results suggest that hierarchy is a central organizing feature of real‐world evolving networks, and the measurement of hierarchy opens the way to understand the structural regimes and evolutionary patterns of self‐organizing networks. Our measurement technique makes it possible to objectively compare hierarchies of different networks and of different evolutionary stages of a single network, and compare evolving patterns of different networks. It can be applied to various complex systems, which can be represented as directed networks. (shrink)

This textbook/software package covers first-order language in a method appropriate for first and second courses in logic. The unique on-line grading services instantly grades solutions to hundred of computer exercises. It is specially devised to be used by philosophy instructors in a way that is useful to undergraduates of philosophy, computer science, mathematics, and linguistics. The book is a completely rewritten and much improved version of The Language of First-order Logic. Introductory material is presented in a more systematic and accessible (...) fashion. Advanced chapters include proofs of soundness and completeness for propositional and predicate logic, as well as an accessible sketch of Godel's first incompleteness theorem. The book is appropriate for a wide range of courses, from first logic courses for undergraduates to a first graduate logic course. The package includes four pieces of software: Tarski's World 5.0, a new version of the popular program that teaches the basic first-order language and its semantics; Fitch, a natural deduction proof environment for giving and checking first-order proofs; Boole, a program that facilitates the construction and checking of truth tables and related notions ; Submit, a program that allows students to submit exercises done with the above programs to the Grade Grinder, the automatic grading service. Grade reports are returned to the student and, if requested, to the student's instructor, eliminating the need for tedious checking of homework. All programs are available for Windows, Macintosh and Linux systems. Instructors do not need to use the programs themselves in order to be able to take advantage of their pedagogical value. More about the software can be found at lpl.stanford.edu. The price of a new text/software package includes one Registration ID, which must be used each time work is submitted to the grading service. Once activated, the Registration ID is not transferable. (shrink)

We describe a novel affect-inspired mechanism to improve the performance of computational systems operating in dynamic environments. In particular, we designed a mechanism that is based on aspects of the fear response in humans to dynamically reallocate operating system-level central processing unit (CPU) resources to processes as they are needed to deal with time-critical events. We evaluated this system in the MINIX® and Linux® operating systems and in three different testing environments (two simulated, one live). We found the affect-based (...) system was not only able to react more rapidly to time-critical events as intended, but since the dynamic processes for handling these events did not need to use significant CPU when they were not in time-critical situations, our simulated unmanned aerial vehicle (UAV) was able to perform even non-emergency tasks at a higher level of efficiency and reactivity than was possible in the standard implementation. (shrink)