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The Software-Defined Vehicular Cloud: A New Level of Sharing the Road
Jang, Insun,Choo, SukJin,Kim, Myeongsu,Pack, Sangheon,Dan, Gyorgy IEEE 2017 IEEE vehicular technology magazine Vol.12 No.2
<P>A vehicular cloud (VC) is a type of mobile ad hoc cloud in which multiple vehicles share their resources and perform collaborative jobs. In this article, we propose a software-defined (SD) VC (SDVC) architecture to achieve flexible VC control and efficient resource utilization in a centralized manner.</P>
Joint Optimization of Service Function Placement and Flow Distribution for Service Function Chaining
Jang, Insun,Suh, Dongeun,Pack, Sangheon,Dan, Gyorgy IEEE 2017 IEEE journal on selected areas in communications Vol.35 No.11
<P>In this paper, we consider the problem of optimal dynamic service function (SF) placement and flow routing in a SF chaining (SFC) enabled network. We formulate a multi-objective optimization problem to maximize the acceptable flow rate and to minimize the energy cost for multiple service chains. We transform the multi-objective optimization problem into a single-objective mixed integer linear programming (MILP) problem, and prove that the problem is NP-hard. We propose a polynomial time algorithm based on linear relaxation and rounding to approximate the optimal solution of the MILP. Extensive simulations are conducted to evaluate the effects of the energy budget, the network topology, and the amount of server resources on the acceptable flow rate. The results demonstrate that the proposed algorithm can achieve near-optimal performance and can significantly increase the acceptable flow rate and the service capacity compared to other algorithms under an energy cost budget.</P>
A Proxy-Based Collaboration System to Minimize Content Download Time and Energy Consumption
Insun Jang,Gwangwoo Park,Dongeun Suh,Sangheon Pack,Dan, Gyorgy IEEE Computer Society 2017 IEEE TRANSACTIONS ON MOBILE COMPUTING Vol.16 No.8
<P>Mobile collaborative community (MCC) is an emerging technology that allows multiple mobile nodes (MNs) to perform a resource intensive task, such as large content download, in a cooperative manner. In this paper, we introduce a proxy-based collaboration system for the MCC where a content proxy (CProxy) determines the amount of chunks and the sharing order scheduled to each MN, and the received chunks are shared among MNs via Wi-Fi Direct. We formulate a multi-objective optimization problem to minimize both the collaborative content download time and the energy consumption in an MCC, and propose a heuristic algorithm for solving the optimization problem. Extensive simulations are carried out to evaluate the effects of the number of MNs, the wireless bandwidth, the content size, and dynamic channel conditions on the content download time and the energy consumption. Our results demonstrate that the proposed algorithm can achieve near-optimal performance and significantly reduce the content download time and has an energy consumption comparable to that of other algorithms.</P>
일개 기독교 대학 신입생의 지각된 스트레스, 신앙성숙도가 주관적 행복감에 미치는 영향
장인순(Insun, Jang) 한국응용과학기술학회 (구.한국유화학회) 2020 한국응용과학기술학회지 Vol.37 No.2
본 연구는 기독교 대학 신입생들의 주관적 행복감에 지각된 스트레스, 신앙성숙도가 어떤 효과를 나타내는가를 파악하기 위해 시도되었다. 서술적 조사연구로, 2018년 4월에 조사된 신입생 232명의 자가보고 설문 자료를 SPSS 프로그램을 이용하여 분석하였다. 주요 연구결과로 주관적 행복감에 영향을 주는 요인은 삶의 만족도, 지각된 스트레스, 동료지지, 가족지지, 신앙성숙도 순으로 나타났고, 이들의 설명력은 70.3%이었다. 따라서 대학에서는 스트레스 감소 및 사회적 지지체계 구축을 위한 노력과 신앙성숙을 위한 다양한 교육적 접근을 시도해야 할 것이다. The purpose of this study was to identify the predictors of subjective happiness of christian university freshman. The study was a cross-sectional descriptive survey. A self-report questionnaire was used to collect data from 232 freshmen in April, 2018. Data were analysed using descriptive statistics and t-test with SPSS win 21.0. Significant predictors of subjective happiness included life satisfaction (β=.515, p<.001), perceived stress (β=-.164, p<.001), peer support (β =.162, p<.001), family support (β=.153, p<.001) and faith maturity (β=.150, p<.001). The regression model explained 70.3% of subjective happiness. Based on these results, effective happiness promotion programs focusing on stress management and build social support system and faith-training program are highly recommended to promote the improved quality of life among christian university freshman.