In the past decades, considerable attention has been paid to the chaos-based image encryption schemes owing to their characteristics such as extreme sensitivity to initial conditions and parameters, pseudo-randomness, and unpredictability. However, some schemes have been proven to be insecure due to using a single chaotic system. To increase the security, this work proposes a novel image encryption scheme based on the piecewise linear chaotic map and the standard map. To the best of our knowledge, it is the first chaos-based (...) image encryption scheme combining the PWLCM with the standard map, which adopts permutation-diffusion structure. Unlike the traditional scrambling way, a hierarchical diffusion strategy, which not only changes the pixel position but also modifies the value, is employed in the permutation phase. The operation model of row-by-row and column-by-column is further used to enhance the efficiency in the diffusion process. Consequently, a good trade-off efficiency and security can be achieved. Furthermore, the numerical simulations and performance analyses illustrate that the proposed encryption scheme can be used in practical application scenarios requiring lightweight security. (shrink)

미래주의적 시각에서 한국교육의 개혁방향을 모색한 연구서. 미래사회가 오늘의 교육에 어떠한 의미와 시 사를 던져주는지, 미래에 일어날 사회변동 추세에 맞 추어 한국교육을 어떠한 방향으로 개혁해야하는가 등 등을 검토하였다.

In his many best-selling books, Yi-Fu Tuan seizes big, metaphysical issues and considers them in uniquely accessible ways. _Human Goodness_ is evidence of this talent and is both as simple, and as epic, as it sounds. Genuinely good people and their actions, Tuan contends, are far from boring, naive, and trite; they are complex, varied, and enormously exciting. In a refreshing antidote to skeptical times, he writes of ordinary human courtesies, as simple as busing your dishes after eating, that make (...) society functional and livable. And he writes of extraordinary courage and inventiveness under the weight of adversity and evil. He considers the impact of communal goodness over time, and his sketches of six very different individuals—Confucius, Socrates, Wolfgang Amadeus Mozart, John Keats, Dr. Albert Schweitzer, and Simone Weil—confirm that there are human lives that can encourage and lead us to our better selves. Best Books for General Audiences, selected by the American Association of School Librarians, and Best Books for Special Interests, selected by the Public Library Association. (shrink)

Philosophy, Iranian. ; Mysticism -- Iran. ; Islamic philosophy--Iran. ; Philosophers -- Iran.

We clarify different definitions of the density matrix by proposing the use of different names, the full density matrix for a single-closed quantum system, the compressed density matrix for the averaged single molecule state from an ensemble of molecules, and the reduced density matrix for a part of an entangled quantum system, respectively. We show that ensembles with the same compressed density matrix can be physically distinguished by observing fluctuations of various observables. This is in contrast to a general belief (...) that ensembles with the same compressed density matrix are identical. Explicit expression for the fluctuation of an observable in a specified ensemble is given. We have discussed the nature of nuclear magnetic resonance quantum computing. We show that the conclusion that there is no quantum entanglement in the current nuclear magnetic resonance quantum computing experiment is based on the unjustified belief that ensembles having the same compressed density matrix are identical physically. Related issues in quantum communication are also discussed. (shrink)

The coronavirus pandemic has resulted in the recommended/required use of face masks in public. The use of a face mask compromises communication, especially in the presence of competing noise. It is crucial to measure the potential effects of wearing face masks on speech intelligibility in noisy environments where excessive background noise can create communication challenges. The effects of wearing transparent face masks and using clear speech to facilitate better verbal communication were evaluated in this study. We evaluated listener word identification (...) scores in the following four conditions: (1) type of mask condition (i.e., no mask, transparent mask, and disposable face mask), (2) presentation mode (i.e., auditory only and audiovisual), (3) speaking style (i.e., conversational speech and clear speech), and (4) with two types of background noise (i.e., speech shaped noise and four-talker babble at −5 signal-to-noise ratio). Results indicate that in the presence of noise, listeners performed less well when the speaker wore a disposable face mask or a transparent mask compared to wearing no mask. Listeners correctly identified more words in the audiovisual presentation when listening to clear speech. Results indicate the combination of face masks and the presence of background noise negatively impact speech intelligibility for listeners. Transparent masks facilitate the ability to understand target sentences by providing visual information. Use of clear speech was shown to alleviate challenging communication situations including compensating for a lack of visual cues and reduced acoustic signals. (shrink)

There is no notion of postmortem Heaven and Hell in both ancient Israeli and Confucian traditions, and the two traditions also share quite a number of similarities about the idea of immortal life after death. Therefore, a comparison of the commonness in this field, e.g. the Jewish Levirate Marriage custom and the Confucian custom of adopting one’s son as heir; the idea of name surviving death in Biblical Judaism and that of glorifying one’s parents by making one’s name famous in (...) future ages in Confucianism, can help us reveal the common pursuit in the two traditions: the postmortem fulfillment of an individual is realized in the form of the continuation of one’s family/ tribe/ nation of which they were, and forever remain, a generational link. In addition, this can help clarify a long faulted Confucian dogma of “Having no male heir being the gravest of the three cardinal offences against filial piety”. (shrink)