Dislocation Density-Based Constitutive Model and Processing Map for T2 Copper During Isothermal and Time-Variant Deformation

Gang Chen,Yu Jin,Jing Wang,Cheng Zhang,Qiang Chen,Hongming Zhang,Xingjian Zhao,Zhiyong Li,Changhai Xie,Zhiming Du 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9

Isothermal compression tests were carried out to study the hot deformation behavior of T2 copper under various conditions. The deformation parameters, such as temperature and strain rate, have strong influence on flow stress and microstructureevolution of the alloy. A unified dislocation density-based model considering dynamic recovery and recrystallization wasestablished. And material parameters of the developed model were optimized by genetic algorithm. Comparisons betweenthe experimental and model data demonstrates that the developed model can precisely describe the flow behavior at quitewide range of deformation conditions. Meanwhile, the designed iterative procedure allows the model to be applied in timevariantdeformation conditions. Processing map and microstructure examination were constructed to optimize the processingwindow of the studied alloy. According to the processing maps, flow instability mainly appeared at low temperatures of500–650 °C and strain rates higher than 0.1 s−1. The optimum deformation parameters of T2 copper was concluded as thetemperature range of 700–800 °C and the strain rate of 0.1–1 s−1.

Fuel Economy Analysis of a Series Hybrid Electric Bus with Low-Speed Shutdown Control Strategy

Xiaogang Wu,Han Chen,Jiuyu Du,Chen Hu 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10

The series hybrid electric bus that is demonstrated operating in China has the problem of non-ideal fuel economy for the conventional auxiliary equipment can’t shut down the engine. Based on the series hybrid electric bus using electric auxiliary equipment, a control strategy is proposed based on the combination of engine low-speed shutdown and load following. The main control variables are battery SOC and vehicle speed, and the engine low-speed shutdown is realized. Three different driving cycles are employed: Chinese city driving cycle, Zhuzhou city of Hunan province driving cycle, and Hefei city of Anhui province driving cycle. By using the analysis method of the energy flow diagram, the fuel economy in different driving cycles is compared and analyzed. The simulation results show that the control strategy of the engine low-speed shutdown affects little on fuel economy in different driving cycles. All the fuel-saving ratios of the series hybrid system in different driving cycles can reach above 25%.

Uncovering the Face of Android Ransomware: Characterization and Real-Time Detection

Chen, Jing,Wang, Chiheng,Zhao, Ziming,Chen, Kai,Du, Ruiying,Ahn, Gail-Joon IEEE 2018 IEEE transactions on information forensics and sec Vol.13 No.5

<P>In recent years, we witnessed a drastic increase of ransomware, especially on popular mobile platforms including Android. Ransomware extorts victims for a sum of money by taking control of their devices or files. In light of their rapid growth, there is a pressing need to develop effective countermeasure solutions. However, the research community is still constrained by the lack of a comprehensive data set, and there exists no insightful understanding of mobile ransomware in the wild. In this paper, we focus on the Android platform and aim to characterize existing Android ransomware. Specifically, we have managed to collect 2,721 ransomware samples that cover the majority of existing Android ransomware families. Based on these samples, we systematically characterize them from several aspects, including timeline and malicious features. In addition, the detection results of existing anti-virus tools are rather disappointing, which clearly calls for customized anti-mobile-ransomware solutions. To detect ransomware that extorts users by encrypting data, we propose a novel real-time detection system, called RansomProber. By analyzing the user interface widgets of related activities and the coordinates of users’ finger movements, RansomProber can infer whether the file encryption operations are initiated by users. The experimental results show that RansomProber can effectively detect encrypting ransomware with high accuracy and acceptable runtime performance.</P>

Transcreation & Multidisciplinary Translation Theories

Chen Du 한국외국어대학교 통번역연구소 2019 한국외국어대학교 통번역연구소 학술대회 Vol.2019 No.07

Very often, translation involves rewriting and research. The writer of this article has found that due to the drastic differences between English thinking and Chinese thinking, between these two languages and between these two cultures, not all Chinese writings “equal” their English versions completely, that is, there are “imbalances” between them more or less, and this is especially true in the literary translation area. Further, the author of this article suggests that some “imbalances” are created purposely in order to retain “fidelity” to the source work and the source culture to some extent while integrating with the target language and the target culture. In addition, the author pointed out some “loopholes” in the traditional and classic Chinese translation theories, and proposed several transcreation theories to countermeasure the “loopholes” and to illustrate “imbalances”. In this article, the author coined a new word, “transwriting”, and dissected the translation process into two processes, that is, understanding and rewriting. In addition, the author proposed a novel translation theory that incorporates the writing field in both the source language and the target language, for the purpose of cultural transmission and integration, and further illustrated the relationship between translation and writing and especially literary writing. In this way, the author expands the transcreation field to include the writing field and especially the literary writing field. Moreover, the author suggests that the transcreation field develop some criteria, such as, stringency, accuracy, flexibility, and that all the science, social science and humanities subareas in the transcreation field are categorized according to these criteria. Also, the author suggests that the Chinese-English translation realm expand to incorporate the research theories and methods in other fields, such as, science (e.g., statistical methods), and that the translation realm restructure its system of theories and educational system to meet the demands of the era of global integration, for example, establishing a translation minor for each science major. Although this article mainly addresses the Chinese-English translation realm, it can also provide valuable ideas to other translation pairs. At last, this article may shed new light on the limitations of and possible solutions to machine translation in the various translation sub-areas and especially the literary translation area. For example, this article may answer questions like “Is understanding unimportant for machine translation?” In order to support the transcreation theories and multidisciplinary translation theories proposed in this article, some typical examples are provided.

Preparation of Si3N4-based antimicrobial coatings from suspensions with long-time stability

Du Songmo,Zhang Jie,Sun Siyuan,Lifei Zhang,Chen Zhanglin,Zhang Shijia,Zhao Shuo,Tian Zhaobo,Ning Xiaoshan,Chen Kexin,Cui Wei,Liu Guanghua 한국세라믹학회 2024 한국세라믹학회지 Vol.61 No.3

A Si 3N4-based antimicrobial coating was fabricated from suspensions with long-time stability. The stability of Si 3N4 sus- pension and the antimicrobial performance of coating were investigated. The viscosity of Si 3N4 suspension was found to be the key factor aff ecting both stability and antimicrobial performance. The Si 3N4 suspensions were modifi ed with HASE acrylic copolymer, PAA-NH 4, and Polyurethane, resulting in an improvement of the stability of Si 3N4 suspension from a few hours to six months. The coating produced using the modifi ed Si 3N4 suspension exhibited an antibacterial activity of 99.9%. This study highlights the crucial role of modifying the Si 3N4 suspension in improving its long-term stability and coating antimicrobial activity.

Architecture of LTE-WIFI Integration for SDN Towards IP Systems

Chen Yange,Zhang Zhili,Du Genyuan,Chen Shangbo 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.12

Against the background of a surge in software-defined network (SDN)as well as urgent demands for LTE-WIFI internetworking and IPv6 network integration, the paper integrates LTE mobile telecommunication technology, wireless local area network and 5G (the fifth generation mobile communication system)into one, in an attempt to complete routing, distribution, and transmission of different radio frequency signals (i.e.LTE, WIFI) on the SDN basis. As a result, large-area coverage of LTE-WIFI network signals is realized in a way that meeting the demands of reliability, safety,flexibility and extendibility for mobile internet. What is more, different complementary wireless telecommunication systems are closed combined with each other. Through the use of SDN integration technology, the paper designs network integration architecture of IP-LTE mobile internet and WIFI, and also studies on the application of SDN-based IP optical integration network, which has broad prospects.

Long-term continuously monocropped peanut significantly disturbed the balance of soil fungal communities

Chen Mingna,Zhang Jiancheng,Liu Hu,Wang Mian,Pan LiJuan,Chen Na,Wang Tong,Jing Yu,Chi Xiaoyuan,Du Binghai 한국미생물학회 2020 The journal of microbiology Vol.58 No.7

Balancing soil microbial diversity and abundance is critical to sustaining soil health, and understanding the dynamics of soil microbes in a monocropping system can help determine how continuous monocropping practices induce soil sickness mediated by microorganisms. This study used previously constructed gradient continuous monocropping plots and four varieties with different monocropping responses were investigated. The feedback responses of their soil fungal communities to short-term and long-term continuous monocropping were tracked using high-throughput sequencing techniques. The analyses indicated that soil samples from 1 and 2 year monocropped plots were grouped into one class, and samples from the 11 and 12 year plots were grouped into another, regardless of variety. At the species level, the F. solani, Fusarium oxysporum, Neocosmospora striata, Acrophialophora levis, Aspergillus niger, Aspergillus corrugatus, Thielavia hyrcaniae, Emericellopsis minima, and Scedosporium aurantiacum taxa showed significantly increased abundances in the long-term monocropping libraries compared to the short-term cropping libraries. In contrast, Talaromyces flavus, Talaromyces purpureogenus, Mortierella alpina, Paranamyces uniporus, and Volutella citrinella decreased in the long-term monocropping libraries compared to the shortterm libraries. This study, combined with our previous study, showed that fungal community structure was significantly affected by the length of the monocropping period, but peanut variety and growth stages were less important. The increase in pathogen abundances and the decrease in beneficial fungi abundances seem to be the main cause for the yield decline and poor growth of long-term monocultured peanut. Simplification of fungal community diversity could also contribute to peanut soil sickness under long-term monocropping. Additionally, the different responses of peanut varieties to monocropping may be related to variations in their microbial community structure.

Patterns and drivers of Vibrio isolates phylogenetic diversity in the Beibu Gulf, China

Chen Xing,Du Hong,Chen Si,Li Xiaoli,Zhao Huaxian,Xu Qiangsheng,Tang Jinli,Jiang Gonglingxia,Zou Shuqi,Dong Ke,Adams Jonathan M.,Li Nan,Jiang Chengjian 한국미생물학회 2020 The journal of microbiology Vol.58 No.12

Members of the genus Vibrio are ubiquitous in aquatic environments and can be found either in a culturable or a viable but nonculturable (VBNC) state. Despite widespread concerns as to how to define the occurrence and dynamics of Vibrio populations by culture-independent approaches, further physiological research and relevant biotechnological developments will require the isolation and cultivation of the microbes from various environments. The present work provides data and perspectives on our understanding of culturable Vibrio community structure and diversity in the Beibu Gulf. Finally, we isolated 1,037 strains of Vibrio from 45 samples and identified 18 different species. Vibrio alginolyticus, V. cyclitrophicus, V. tasmaniensis, V. brasiliensis, and V. splendidus were the dominant species that had regional distribution characteristics. The correlation between the quantitative distribution and community structure of culturable Vibrio and environmental factors varied with the Vibrio species and geographical locations. Among them, salinity, nitrogen, and phosphorus were the main factors affecting the diversity of culturable Vibrio. These results help to fill a knowledge gap on Vibrio diversity and provide data for predicting and controlling pathogenic Vibrio outbreaks in the Beibu Gulf.

Juvenile hormone regulation on the flight capability of Bactrocera dorsalis (Diptera: Tephritidae)

Chen Peng,Chen Min,Ye Hui,Yuan Ruiling,Du Chunhua,Ong Su Ping 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.4

The oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), is considered a major economic threat in many regions worldwide. In order to better understand the flight capacity of B. dorsalis and its physiological basis, the functions and regulatory roles of juvenile hormone (JH) in the flight muscle of B. dorsalis were studied under a controlled environment. JH titer of B. dorsalis varied with age and sex. Females have higher JH titers and better flight capabilities than males, given that the increase in JH also corresponded to the ovarian development and maturation in females. The flight duration and distance of both males and females increased with the gradual increase of JH titer after adult emergences. Both JH titer and flight capability peaked in 15-d-old adult and declined subsequently with age. Flight activity stimulated the production of JH as adults flown for 24 h on the flight mills have the highest JH titers compare to adults flown on shorter flight durations. Adults treated with 0.5 µg and 5 µg of JH III were able to fly long durations and long distances, nevertheless when JH titer was too low or too high, it would restrict the flight ability of the fly. The mutual reinforcement of JH and flight activity provides fundamental understanding on the physiological aspects of the flight capability and dispersal, which facilitates strategies for the long-term control of this destructive pest.

Neural correlates of the popular music phenomenon: evidence from functional MRI and PET imaging

Chen, Qiaozhen,Zhang, Ying,Hou, Haifeng,Du, Fenglei,Wu, Shuang,Chen, Lin,Shen, Yehua,Chao, Fangfang,Chung, June-key,Zhang, Hong,Tian, Mei Springer-Verlag 2017 European journal of nuclear medicine and molecular Vol.44 No.6

<P>Popular music Gangnam Style can arouse pleasure experience and strong emotional response. The left putamen is positively correlated with the mood arousal level score under the Gangnam Style condition. Our results revealed characteristic patterns of brain activity associated with Gangnam Style, and may also provide more general insights into the music-induced emotional processing.</P>