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MOON, Seungil,OO, Thant Zin,KAZMI, S. M. Ahsan,PARK, Bang Ju,HONG, Choong Seon 'Institute of Electronics, Information and Communi 2017 IEICE transactions on information and systems Vol.100e.d No.5
<P>The increase in network access devices and demand for high quality of service (QoS) by the users have led to insufficient capacity for the network operators. Moreover, the existing control equipment and mechanisms are not flexible and agile enough for the dynamically changing environment of heterogeneous cellular networks (HetNets). This non-agile control plane is hard to scale with ever increasing traffic demand and has become the performance bottleneck. Furthermore, the new HetNet architecture requires tight coordination and cooperation for the densely deployed small cell base stations, particularly for interference mitigation and dynamic frequency reuse and sharing. These issues further complicate the existing control plane and can cause serious inefficiencies in terms of users' quality of experience and network performance. This article presents an SDN control framework for energy efficient downlink/uplink scheduling in HetNets. The framework decouples the control plane from data plane by means of a logically centralized controller with distributed agents implemented in separate entities of the network (users and base stations). The scheduling problem consists of three sub-problems: (i) user association, (ii) power control, (iii) resource allocation and (iv) interference mitigation. Moreover, these sub-problems are coupled and must be solved simultaneously. We formulate the DL/UL scheduling in HetNet as an optimization problem and use the Markov approximation framework to propose a distributed economical algorithm. Then, we divide the algorithm into three sub-routines for (i) user association, (ii) power control, (iii) resource allocation and (iv) interference mitigation. These sub-routines are then implemented on different agents of the SDN framework. We run extensive simulation to validate our proposal and finally, present the performance analysis.</P>
문철웅,정종훈,박천국,이승일,배학연,장경식,김만우,정춘해,홍순표,이병래,김호중 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1
Renal ischemia is one of the most common causes of acute renal failure. Four factors related to the pathogenesis of acute renal failure are vasoconstriction, decreased glomerular filtration rate, tubular back leak of filtrate, and intratubular obstruction. The cellular response to renal ischemic insults include decreased content of adenosine trihosphate, lipid peroxidation induced membrane degradation, alteration in cellular pH, and calcium or phospholipase induced mitochondrial dysfunction. Much attention has been given to the role of increased cellular calcium as a pathogenetic contributor to cell injury during ischemia. Author studied the protective effects of calcium antagonists on cellular injury during renal ischemia in rat. To investigate the protective role of these agents, author measured the amount of malondialdehyde(MDA) and the enzyme activities of free radical scarvengers-superoxide dismutase(SOD), catalase and glutathione peroxidase from non-pretreated group and calcium antagonists pretreated groups in control, ischemia and reflow subgroups. The results were summerized as follows: 1) The amount of MDA in non-pretreated group was higher in the reflow compared with the control(<p<0.01). But, in all pretreated groups, there was no statistically difference in the amount of MDA. 2) The SOD activity in non-pretreated group was lower in both the ischemia and the reflow compared with the control (P<0.05). But, in both verapamil and trifluoperazine-pretreated groups, there was no statistically difference in the SOD activity. 3) Both catalase and glutathione peroxidase activities in non-pretreated group were lower in both the ischemia and the reflow compared with the control (P<0.05). But in all pretreated groups, there was no statically difference in both catalase and glutathione peroxidase activities. These results suggest that free radical mediated ischemic injury by renal artery clamp in rat can be protected by intraperitoneal pretreatment with calcium antagonists. As trifluoperazine has a protective effect in renal ischemia, the calcium activated calmodulin dependent enzyme may play a role in renal ischemic injury.
중학교 이후 교육 및 고용 경로 유형과 결정요인: 한국교육고용패널 1-12차년도 자료를 중심으로
문인영(Moon in young),나승일(Na SeungIl) 한국진로교육학회 2021 진로교육연구 Vol.34 No.1
본 연구는 2004년도 중학교 3학년 학생의 중학교 졸업 이후 생애 단계별 교육 및 고용 경로 분포를 밝히고 그 유형과 유형별 결정요인을 구명하는 것을 목적으로 한국교육고용패널의 1차년도부터 12차년도까지의 자료를 분석했다. 중학교 이후 12년간의 생애 단계는 세 단계로 구분되고, 진학한 고교 유형에 따라 고용 비율이나 경로가 달라지는 것으로 나타났다. 중학교 이후의 교육 및 고용경로 유형은 최적일치법과 군집분석을 활용하여 특성화고-전문대-상용직(유형1), 일반고-4년제대,미상-4년제대-상용직(유형2), 일반고-4년제대(유형3), 일반고-4년제대-상용직/대학원(유형4), 일반고-전문대-상용직(유형5), 특성화고-전문대/상용직-상용직(유형6), 특성화고-4년제대-상용직(유형7)으로 구분할 수 있었고 각 유형별로 학업성취도, 교육포부, 월평균가구소득 및 사교육비 지출, 부모학력, 부모의 자녀교육 희망수준, 부모와의 진로대화에서 유의한 차이가 발견되었다. 이를 통해 중학교 이후 교육 및 고용 경로에 대한 개략적인 정보를 제공할 수 있고 각 유형별 학생 특성에 따른 진로지도에 시사점을 줄 수 있다. The purpose of this study is to determine the education and employment paths after graduating from middle school in 2004, to identify pattern of the paths and the determinants for each pattern. As a result of dividing after middle school into high school, college, university and work stages, the distribution of education employment after middle school differs according to the type of high school. Vocational high school, the rate that leads to employment is high, and the rate of admission after employment is high, indicating that the original purpose was achieved. Next, by clustering of education and employment paths, vocational high school-college-regular employment (pattern 1), general high school-university & unknown-university-regular employment (pattern 2), general high school-university (pattern 3), general high school-college-regular employment/graduate school (pattern 4), general high school-college-regular employment (pattern 5), vocational highschool-college/regular employment-regular employment (pattern 6), vocational highschool-university-regular employment (pattern 7). Each pattern was classified into gender, academic achievement, educational aspirations, monthly average household income and private education expenditure, parents’ academic background, parents aspiration of children’s education, and communication about career paths with parents. It is possible to provide outline information on education and employment paths after middle school, and to give implications to career guidance according to the characteristics of each pattern of student.
디젤기관과 촉매코팅필터를 이용한 NOx와 Soot의 동시저감에 관한 연구
채재우(JaeOu Chae),박창하(Changha Park),문승일(Seungil Moon),Vladimir Demidiouk,이대엽(Daeyup Lee),정태균(Taegyun Jung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
Recently, for the past ten years(1990-2000), the pollutant control of emitting exhaust gas for vehicles with internal engines has became more strict. The main harmful components of the pollutants in the exhaust gas of diesel engines are NOx, PM, HC and CO. Numerous researches have been made elsewhere in the world to reduce the pollutant components of the exhaust gas. But the problems were not yet cleared industrial for the appliances. Thus, the intensive studies in this fields are still being carried out.<br/> The aim of this study is for the reduction of NOx and Soot using Catalyst Coating Filter (CCF) with the experimental study on the factors which have influence on the continuous regeneration of the filter. The experiments were performed in this work at conditions of load(%) at ; 50, 75, 100, and speed(rpm) at ; 1000, 1250, 1500, 1750.
풍력발전기를 고려한 전력계통의 확률론적인 신뢰도 평가에 관한 연구
朴正濟(Jeongje Park),吳量(Wu Liang),崔在錫(Jaeseok Choi),文承逸(Seungil Moon) 대한전기학회 2008 전기학회논문지 Vol.57 No.9
This paper presents a study on reliability evaluation of a power system considering wind turbine generators (WTG) with multi-state. Renewable energy resources such as wind, wave, solar, micro hydro, tidal and biomass etc. are becoming importance stage by stage because of considering effect of the environment. Wind energy is one of the most successful sources of renewable energy for the production of electrical energy. But, reliability evaluation of generating system with wind energy resources is a complex process. While the wind turbine generators can not modelled as two-state model as like as conventional generators, they should be modelled as multi-state model due to wind speed random variation. The methodology for obtaining reliability evaluation index of wind turbine generators is different from it of the conventional generators. A method for making outage capacity probability table of WTG for reliability is proposed in this paper. The detail process is presented using case study of simple system
Power Tracing을 이용한 VSC HVDC 설치위치 선정
오세승(Oh Sea Seung),장길수(Jang Gilsoo),문승일(Moon Seungil) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
This paper presents a HVDC site selection algorithm to increase transfer capability using VSC HVDC system which can control active power as well as reactive power. Using normal powerflow results and simple index k<SUB>r</SUB> the HVDC site selection algorithm is enhanced and more tightly-coupled transmission lines are identified in a domain of generators.
오세승(Oh Sea Seung),장길수(Jang Gilsoo),문승일(Moon Seungil) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
Visualization has a strong capability to manage and display a large volume of data. It makes system analysis more intuitive and helps an operator In monitoring system status, understanding its phenomena, identifying its problems, and performing corrective action to maintain the security of the system. In this paper visualization program is developed based on a COTS-based software development concept in a distributed environment using open-source application software and development tools.