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Effects of the Frequency-degree Correlation on Local Synchronization in Complex Networks
Shijin Jiang,Wenyi Fang,Shaoting Tang,Sen Pei,Shu Yan,Zhiming Zheng 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.2
We investigate the effects of the frequency-degree correlation on local synchronization in complex networks with Kuramoto oscillators. We find that a discontinuous synchronization transition occurs in the local patterns for heterogenous networks while for homogenous networks, the local synchronization transition remains continuous. Then, we extend our study to a general frequency-degree correlation case and conclude that the positive correlation does not change the local synchronization patterns while in the case of a negative correlation, the local synchronization transition degenerates to second order. Moreover, the correlation parameter α is verified to have a strong influence on the synchronization level. In particular, smaller |α| results in higher synchronization ability and faster speed to a synchronized state. Our study provides a deeper understanding of the effects of the frequency-degree correlation on network synchronization.
Shijin Yoo,She-Woong Chung,Jin K. Han 연세대학교 동서문제연구원 2006 Global economic review Vol.35 No.2
premised upon identifying personal factors (e.g. demographics or psychographics) underlyingthe purchase decision. On a broader scope, however, consumer behavior is shaped by cultural andsocial factors, and our understanding would be incomplete without these considerations. To thisend, this study sets out to provide an integrative framework on durable consumption. Specifically,the proposed framework explores whether cultural differences do exist in the perception of aselected durable (e.g. automobile) on the symbolic/utilitarian dimension, which in turn, may affectthe length of the replacement cycle, likelihood of upgrading to a higher status model, as well as,van,pickup truck). Applying a multinomial logit model to Korean and US automobile transactiondata, the finding reveal that Korean consumers tend to have shorter replacement cycles, engage inmore upgrades but are less likely to change the product-type than American consumers.vers of the differences inperception and behavior are put forward. Managerial implications and directions for futureresearch are also discussed.
Pioneering New Markets: A Case study of SevenBräu
Yoo, Shijin,Kang, Myung Soo,Kim, Minjeong Korean Marketing Association 2019 ASIA MARKETING JOURNAL Vol.20 No.4
This paper reports a case study of SevenBräu, the first company to acquire a license for small and medium scale beer manufacturing in Korea. This study explores how SevenBräu analyzed its consumers, competition, and environment to set its target market and successfully positioned itself to explore new markets in Korea. The company accomplished this through a mixture of marketing strategies with differentiated products and consumer benefits. SevenBräu has been growing fast and establishing its image as a "high-quality craft beer locally produced in a traditional way" and a "beer with regional characteristics," with young consumers (aged 20 to 35) as the main target. Such remarkable growth of SevenBräu can be attributed to factors such as: (1) product differentiation to satisfy the needs of consumers for taste, flavor, diversity, and freshness, (2) developing brands with regional characteristics and actively communicating its strategy through earned and owned media, and (3) sustainable management, considering both social value creation and environmental performance. Lastly, this case study presents challenges in the areas of brand management, value delivery network, and communication that SevenBräu needs to address in the beer market that faces increasing competition.
화학물질 배출·이동량 자료를 이용한 유해기반 지수의 시공간 특성 연구
김시진(Shijin Kim),임유라(Yu-ra Lim),배현주(Hyun-Joo Bae) 한국환경보건학회 2021 한국환경보건학회지 Vol.47 No.2
Objectives: This study was intended to identify hazard contribution by region, media, and chemical by calculating a hazard-based index using pollutant release and transfer register (PRTR) data. Methods: PRTR data for the period 2011 to 2016 was analyzed to examine the regional trends in toxic releases in terms of quantity and to create a corresponding hazard-based index. For the hazard-based index, the Risk- Screening Environmental Indicators (RSEI) Model was used. Results: The results of the trend analysis show that total releases decreased slightly, but health hazard levels increased consistently. According to the outcome of regional contribution analysis of the hazard-based index, Chungcheongnam-do, Jeollabuk-do and Gyeonggi-do Provinces showed a high ratio in the index for air and water release pollutants, while Gyeongsangbuk-do and Gyeongsangnam-do Provinces showed a high ratio in the index of soil release and waste transfer pollutants. Also, as a result of the analysis of the top ranked substances in the hazard-based index, it was found that chromium, cobalt and its compounds, and ethylene oxide contributed greatly to air release substances, while chromium, benzene, and lead and its compounds contributed greatly to water release substances. Conclusion: These results showed considerable disparities between total release and health hazard levels, especially in the analysis of contribution by regions and by chemical substance. Therefore, the hazard-based index should be used both to support a more comprehensive and robust approach to screening of chemicals for environmental health policy and for management.
Zhu, Shijin,Li, Li,Liu, Jiabin,Wang, Hongtao,Wang, Tian,Zhang, Yuxin,Zhang, Lili,Ruoff, Rodney S.,Dong, Fan American Chemical Society 2018 ACS NANO Vol.12 No.2
<P>Two-dimensional birnessite has attracted attention for electrochemical energy storage because of the presence of redox active Mn<SUP>4+</SUP>/Mn<SUP>3+</SUP> ions and spacious interlayer channels available for ions diffusion. However, current strategies are largely limited to enhancing the electrical conductivity of birnessite. One key limitation affecting the electrochemical properties of birnessite is the poor utilization of the MnO<SUB>6</SUB> unit. Here, we assemble β-MnO<SUB>2</SUB>/birnessite core–shell structure that exploits the exposed crystal face of β-MnO<SUB>2</SUB> as the core and ultrathin birnessite sheets that have the structure advantage to enhance the utilization efficiency of the Mn from the bulk. Our birnessite that has sheets parallel to each other is found to have unusual crystal structure with interlayer spacing, Mn(III)/Mn(IV) ratio and the content of the balancing cations differing from that of the common birnessite. The substrate directed growth mechanism is carefully investigated. The as-prepared core–shell nanostructures enhance the exposed surface area of birnessite and achieve high electrochemical performances (for example, 657 F g<SUP>–1</SUP> in 1 M Na<SUB>2</SUB>SO<SUB>4</SUB> electrolyte based on the weight of parallel birnessite) and excellent rate capability over a potential window of up to 1.2 V. This strategy opens avenues for fundamental studies of birnessite and its properties and suggests the possibility of its use in energy storage and other applications. The potential window of an asymmetric supercapacitor that was assembled with this material can be enlarged to 2.2 V (in aqueous electrolyte) with a good cycling ability.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2018/ancac3.2018.12.issue-2/acsnano.7b03431/production/images/medium/nn-2017-03431b_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b03431'>ACS Electronic Supporting Info</A></P>