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Analytical Approach of Proxy-LMA Mobility System in Heterogeneous IP-based Mobile Networks
Cho, Chulhee,Choi, Jae-Young,Jeong, Jongpil The Institute of Internet 2015 International journal of advanced smart convergenc Vol.4 No.1
Mobile users want to be provided with undisrupted network services when they navigate on the Next-Generation (NG) wireless networks. For that, interlocking with a heterogeneous network is important, but there have been few studies on the method for guaranteeing global mobility. Thus, this paper proposes the Proxy-LMA technique, the mobile IP-based global inter-networking system, to enhance global mobility and interoperability within the Next-Generation (NG) network environment. The purpose of the proposed Proxy-LMA system is to expand the boundary of the mobility with regards to the existing mobility management protocol (PMIPv6 and MIPv6) in order to guarantee global mobility and interoperability within the heterogeneous network environment. The results of the performance evaluation showed that the proposed Proxy-LMA system was more efficient than other methods from the standpoint of signaling cost and delay in the heterogeneous network environment.
Analytical Approach of Proxy-LMA Mobility System in Heterogeneous IP-based Mobile Networks
Chulhee Cho,Jae-Young Choi,Jongpil Jeong 한국인터넷방송통신학회 2015 Journal of Advanced Smart Convergence Vol.4 No.1
Mobile users want to be provided with undisrupted network services when they navigate on the Next-Generation (NG) wireless networks. For that, interlocking with a heterogeneous network is important, but there have been few studies on the method for guaranteeing global mobility. Thus, this paper proposes the Proxy-LMA technique, the mobile IP-based global inter-networking system, to enhance global mobility and interoperability within the Next-Generation (NG) network environment. The purpose of the proposed Proxy-LMA system is to expand the boundary of the mobility with regards to the existing mobility management protocol (PMIPv6 and MIPv6) in order to guarantee global mobility and interoperability within the heterogeneous network environment. The results of the performance evaluation showed that the proposed Proxy-LMA system was more efficient than other methods from the standpoint of signaling cost and delay in the heterogeneous network environment.
Nickel 촉매를 사용한 Neopentyl Arenesulfonates와 Aryl Grignard Reagents의 C-C Cross-Coupling 반응
조철희,박광용 중앙대학교 미래신기술연구소 2001 미래신기술연구소 논문집 Vol.10 No.1
Biphenyl 유도체들은 천연물과 의약품 등에서 많이 발견되고 있는 구조로서 다양한 생물학적 활성을 갖고 있는 것으로 알려져 있다. 본 연구에서는 (dppf)NiCl_2 촉매를 사용하여 여러 가지 neopentyl arensulfonates 를 aryl Grignard 시약과 반응시킴으로써 다양한 biphenyl 유도체들을 우수한 수율로 합성하였다. Biphenyl derivatives, which are often found in natural products and pharmaceuticals, have been known to possess various biological activities. We synthesized a variety of biphenyls in good yields by the reaction of neopentyl arenesulfonate with aryl Grignard reagents in the presence of (dppf)NiCl_2 as a catalyst.
해수유동 수치모의를 활용한 조류에너지 잠재량 산정 연구
조철희(Chulhee Jo),이강희(Kanghee Lee),조봉근(Bongkun Cho),황수진(Sujin Hwang) 한국신재생에너지학회 2016 신재생에너지 Vol.12 No.S2
This paper describes the methodology and results of a tidal current resource assessment in Korea based on the mean surface velocities from tidal current observations and numerical simulations. The tidal current observation data from 1,938 measuring points was provided by the KHOA (Korea Hydrographic and Oceanographic Agency). A numerical simulation of ocean flow circulation in Korea was conducted to explore the detailed distribution of tidal currents in Incheon-Gyeonggi and Jeollanam-do where there are very high tidal energy potentials and suitable sites for tidal energy farm development. The theoretical tidal current potential was calculated using the API (Averaged Power Intercepted) method which is generally applied in wind power potential estimation in Korea. A numerical simulation of the flow circulation through narrow passages between the islands is very important for resource assessment study.
Turnover and Retention in Nonprofit Employment : The Korean College Graduates’ Experience
Kang, Chulhee,Huh, Sooyeon,Cho, Sangmi,Auh, Erica Yoonkyung SAGE Publications 2015 Nonprofit and voluntary sector quarterly Vol.44 No.4
<P>Korea’s nonprofit sector has undergone a sudden expansion in the last decade and its nonprofits experienced high employee turnover. This study is the first in Korean literature to examine workforce shifts in nonprofit organizations and explore influential factors that explain job changes from the nonprofit sector to other sectors. Using a three-wave panel data set of community college/university graduates, the Graduates Occupational Mobility Survey, we conducted a discrete-time survival analysis with the dependent variable of actual turnover. Our findings indicate that over half of employees left nonprofits within a year, and the majority found a new job in for-profit organizations. Different factors predicted turnover to for-profits, government agencies, and educational or research institutes. Age, wage level, employment type, and the size of nonprofit organizations explained employee shifts. Satisfaction with one’s overall job, job content, social reputation, and opportunities for career development were significant predictors. Implications for nonprofit organizations are discussed.</P>
Development of Ground Monitoring and Control System for Korea Augmentation Satellite System
Daehee Won,Chulhee Choi,Eunsung Lee,Hantae Cho,Dongik Jang,Eunok Jang,Heetaek Lim,Ho Sung Lee,Jungja Kim,Joohap Choi 사단법인 항법시스템학회 2023 Journal of Positioning, Navigation, and Timing Vol.12 No.2
The Korea Augmentation Satellite System (KASS) is the first satellite navigation enhancement system in Korea developed in compliance with international standards. Technologies accumulated during the development process should be spread to industries such as academia and serve as the basis for developing the domestic satellite navigation field. This paper introduces the development process from design to implementation, testing, and verification of KASS control systems (KCS). First, development standards, milestones, requirements, and interface standards are presented as KCS development methods, and major functional design, physical design, and hardware/software implementation are described based on the allocated requirements. Subsequently, the verification environment, procedures, and results of the development product are covered and the developed operational and maintenance procedures are described. In addition, based on the experience gained through the development, suggestions were made for beneficial technology development and organization when promoting satellite navigation projects in the future. Since this work has important historical value for the development of domestic satellite navigation, it is expected that the development results will be shared with academia and industry in the future and be used as basic data for similar development.