Effects of depolarizing quantum channels on BB84 and SARG04 quantum cryptography protocols

We report experimental studies on the effect of the depolarizing quantum channel on weak-pulse BB84 and SARG04 quantum cryptography. The experimental results show that, in real world conditions in which channel depolarization cannot be ignored, BB84 should perform better than SARG04.Comment: 4 pages, 4 figure

Study of the Top-quark Pair Production in Association with a Bottom-quark Pair from Fast Simulations at the LHC

A large number of top quarks will be produced at the Large Hadron Collider (LHC) for Run II period. This will allow us to measure the rare processes from the top sector in great details. We present the study of the top-quark pair production in association with a bottom-quark pair (ttbb) from fast simulations for the Compact Muon Solenoid (CMS) experiment. The differential distributions of ttbb are compared with the top-quark pair production with two additional jets (ttjj) and with the production in association with the Higgs (ttH), where the Higgs decays to a bottom-quark pair. The significances of ttbb process in the dileptonic and semileptonic decay mode are calculated with the data corresponding to an integrated luminosity of 10 fb-1, which is foreseen to be collected in the early Run II period. This study will be an important input in searching for new physics beyond the standard model as well as in searching for ttH process where the Yukawa coupling with the top quark can be directly measured.Comment: 12 pages, 12 figure

Unpacking Japanese Culture in Children’s Picture Books: Culturally Authentic Representation and Historical Events/Political Issues

This study investigated culturally authentic representations and perspectives on historical events and political issues presented in children’s picture books on Japanese culture. Our analysis of the representation of Japanese culture in the texts and illustrations was based on a sample of 37 children’s picture books written in English or English/Japanese and published in the United States between 1990-2016 for ages 3-8. The majority of the sampled books were found to portray a visible and concrete level of Japanese culture, including clothes, food, holidays, festivals, and traditional activities, some of which had outdated and inaccurate descriptions and illustrations. Social customs and behaviors described in the children’s books reflected traditional Japanese values and beliefs well, including respect, harmony, and Wabi Sabi. Books dealing with the crossing of different cultures showed conflicts, confusion, or identity issues in young Japanese protagonists who were often immigrant or biracial. Stories showing Japanese historical events/political issues as background included the voices of the Japanese/Japanese-Americans with their perspectives, instead of mainstream European/American perspectives. Cultural authenticity, going beyond the superficial level to include marginalization at cultural crossings, and the focalization of historical events and political issues portrayed/illustrated in children’s picture books are discussed

Comment on ``Solution of Classical Stochastic One-Dimensional Many-Body Systems''

In a recent Letter, Bares and Mobilia proposed the method to find solutions of the stochastic evolution operator $H=H_0 + {\gamma\over L} H_1$ with a non-trivial quartic term $H_1$. They claim, ``Because of the conservation of probability, an analog of the Wick theorem applies and all multipoint correlation functions can be computed.'' Using the Wick theorem, they expressed the density correlation functions as solutions of a closed set of integro-differential equations. In this Comment, however, we show that applicability of Wick theorem is restricted to the case $\gamma = 0$ only.Comment: 1 page, revtex style, comment on paper Phys. Rev. Lett. {\bf 83}, 5214 (1999

A Study of Personal and Environmental Factors Influencing Bullying

This study aims to find out the differences in the bullying experience between boys and girls in different perspectives and to find out the predictive power of cognitive, social and environmental factors on students’ bully and victim tendencies. At last, through this research, this study aims to gain a synthetic perspective on bully phenomenon by considering various aspects in order to provide a theoretical and empirical reference for preventing and intervening bullying problem. The sample size of students used in the analysis was 405 (271 boys and 134 girls) between 12 and 14 years. They were in seventh and eighth grade at two middle schools in Mokpo Korea. 306 caregivers of the students participated in the survey. As the results of this study, there was no difference in perpetrating bullying or being bullied between boys and girls. Most students and bullies attribute the reason of bullying to the victims’ eye-catching characteristics or social skill problems. On the other hand, most victims did not know reason of bullying. Social support, self-concept, attributional style, and cultural beliefs could predict bully tendency and victim tendency. Above all, the most important factor, that relates to bully and victim tendency, is perceived social supports, especially parental supports. Parents concerning about their child can be most strongest prevention of students bullying problems

The Effect of Learner Proficiency and L1 Transfer on the Use of Make by Korean EFL Learners of English

The present study investigates how learner proficiency and L1 transfer affect Korean EFL learners use of the high frequency verb, make. Using the Korean learner corpus of English, which is composed of 1,030 argumentative essays, the study first analyzes the use of make and compares that with the findings of Altenberg and Granger (2001). Results showed that Korean learners overuse make in produce and causative uses. Study, secondly, examines the effect of learners proficiency and L1 transfer on the use of make. It was found that lower-proficiency learners misuse the verb make much more frequently than advanced learners. In addition, with regard to L1 transfer, the majority of learners misuse result from L1 transfer and even advanced learners are not free from interlingual interference. As a result, this study demonstrates that Korean EFL learners errors with the use of the verb make are largely a product of L1 transfer. Pedagogical implications are provided