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간섭 및 성능 분석을 위한 LTE 시스템 기반 펨토셀 시뮬레이터 개발
김창섭,최범곤,구본태,이미영,정민영,Kim, Chang-Seup,Choi, Bum-Gon,Koo, Bon-Tae,Lee, Mi-Young,Chung, Min-Young 한국시뮬레이션학회 2011 한국시뮬레이션학회 논문지 Vol.20 No.1
최근 가정 또는 사무실과 같은 실내 환경에서 음영지역을 해소하고 고품질의 서비스 제공을 위한 방안으로 초소형 기지국인 펨토셀(Femtocell)이 많은 관심을 받고 있다. 펨토셀은 사업자 및 사용자에게 다양한 이점을 제공하지만 펨토셀의 도입을 위해 서는 채널 선택에 따른 간섭제어, 네트워크 동기화, 자기 최적화 등 다양한 기술적 문제점이 해결되어야 한다. 이를 위해 본 연구에서는 펨토셀의 도입으로 인하여 발생 가능한 다양한 신호간섭 문제들에 대한 분석을 용이하게 하기 위한 LTE(Long Term Evolution) 시스템 기반 펨토셀 시뮬레이터를 개발하였다. 개발된 시뮬레이터는 단말 이동성, 스케줄러, 호 수락 제어, 트래픽 생성, MCS(Modulation and Coding Scheme) 결정의 5개의 블록과 이를 연결하고 관리하는 메인 모듈로 구성되어 있다. 또한 사용자의 편의성을 도모하기 위하여 시뮬레이션 결과를 실시간으로 관측할 수 있는 GUI(Graphical User Interface)를 적용하였다. 본 시뮬레이터는 실제와 유사한 환경에서 매크로셀과 펨토셀 사이의 간섭영향을 면밀히 분석하고 이동통신 시스템의 성능을 효과적으로 평가할 수 있도록 지원하며, 다양한 펨토셀 시스템을 개발하는데 크게 기여할 수 있을 것으로 예상된다. Recently, femtocell has been concerned as one of effective solutions to relieve shadow region and provide high quality services to users in indoor environments. Even though femtocell offers various benefits to cellular operators and users, many technical issues, such as interference coordination, network synchronization, self-configuration, self-optimization, and so on, should be solved to deploy the femtocell in current network. In this paper, we develop a simulator for evaluating performance of long term evolution (LTE) femtocell systems under various interference scenarios. The simulator consists of a main-module and five sub-modules. The main-module connects and manages five sub-modules which have the functionality managing user mobility, packet scheduling, call admission control, traffic generation, and modulation and coding scheme (MCS). To provide user convenience, the simulator adopts graphical user interface (GUI) which can observes simulation results in real time. We expect that this simulator can contribute to developing effective femtocell systems by supporting a tool for analyzing the effect of interference between macrocell and femtocell.
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Statistical Work-Energy Theorems in Deterministic Dynamics
김창섭 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.2
We theoretically explore the Bochkov-Kuzovlev-Jarzynski-Crooks work theorems in a finite system subject to external control, which is coupled to a heat reservoir. We first elaborate the mechanical energy balance between the system and the surrounding reservoir and then proceed to formulate its statistical counterpart under the general nonequilibrium conditions. Consequently, a consistency condition is derived, underpinning the nonequilibrium equalities, both in the framework of the system-centric and nonautonomous Hamiltonian pictures, and its utility is examined in a few examples. Also, we elucidate that the symmetric fluctuation associated with forward and backward manipulation of the nonequilibrium work is contingent on time-reversal invariance of the underlying mesoscopic dynamics.
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대학생의 여가유능감과 여가스포츠 참가 및 자아정체감의 관계
김창섭 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.4
The purpose of this study Is analysis to the relationship of variables among university student's leisure competence, leisure sports participation and perceived self-Identity, More specifically, this study Is mainly purposed to show the relationship of variables among university student's subfactor of leisure competence, leisure sports participation, and perceived self-identity-stability. This study was set up to university students as a mother group at the university which located In Seoul and Kyunggi-do, and whose sampling method was clustered sampling method and extracted number of 3B9, The results were as follows : The stability of leisure competence and leisure sports participation largely to Influence high effects on perceived self-Identity, More details In sub-factors, there was shown to effect of social, cognitive competence of leisure competence and leisure sports participation.
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탄소함량 변화에 따른 Fe-15Cr-5V-X%C 합금의 응고 조직 및 기계적 성질
김창섭,오규환,나형용,이희춘,조규섭 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.12
Fe-15Cr-5V-X%C(X=0.75, 1.2 and 2.3) alloys have been poured into sand mold, and quenched interruptly to study the solidification process and microstructures varied with carbon content. Solidified structures of Fe-15Cr-5V-X%C alloys were made of α-ferrite +MC+M_7C₃ in 0.75%C, α-ferrite+MC+M_(23)C_6+M_7C₃ in 1.2%C and α+MC+M_7C₃ in 2.3%C alloy. Hardness increased with increasing carbon content and wear resistance was dependent on the existance of eutectic M_7C₃ carbide. Eutectic was the most brittle structure in the solidified structures and primary phase supported the strength of Fe-15Cr-5V-X%C alloys.
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Electricity Pricing Policy Alternatives to Control Rapid Electrification in Korea
김창섭,신정우 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.2
Although South Korea experienced a rolling blackout in 2011, the possibility of a blackout in South Korea continues to increase due to rapid electrification. This study examines the problems of energy taxation and price distortions as possible reasons for the rapid electrification in South Korea, which is occurring at a faster rate than in Japan, Europe, and other developed countries. Further, we suggest new energy taxation and price systems designed to normalize electricity prices. In order to do so, we consider two possible scenarios: the first imposes a tax on bituminous coal for electricity generation and the second levies a tax to provide compensation for the potential damages from a nuclear accident. Based on these scenarios, we analyze the effects of a new energy system on electricity price and demand. The results show that a new energy system could guarantee the power generation costs and balance the relative prices between energy sources, and could also help prevent rapid electrification. Therefore, the suggested new energy system is expected to be utilized as a basis for energy policy to decrease the speed of electrification, thus preventing a blackout, and to induce the rational consumption of energy in South Korea.
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김창섭,박현곤 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
To address mounting concerns over global warming, the Paris Agreement was reached in December 2015, which aims to limit the increase in global average temperature. South Korea has set a highly ambitious target to reduce emissions and submitted an Intended Nationally Determined Contribution (INDC). Based on the INDC, we investigated the impact of limiting carbon emissions on the power system and the electricity market in Korea. Through detailed simulations on assumed plausible scenarios, this work highlights a) the effects of different carbon emission targets on the annual carbon emission volumes, generation costs, and carbon price; b) the generation mix changes induced by carbon emission limits; and c) the difference in system marginal price and payments for generator owners that carbon emission constraint creates in electricity markets under three different pricing rules.
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