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조남신(Cho Nam Shin),이진주(Lee Jin Joo) 한국경영학회 1980 經營學硏究 Vol.9 No.-
The modern decision environment is characterized by the presence of multiple objectives or goals, which are generally competing or conflicting. Therfore, it has been well established that virtually every decision making problem involves several key criteria. Mathematical programming techniques based on a single objective criterion such as cost minimization or profit maximization are restricted in application to real-world problems. Radford (14) contended that the goal of a global optimum solution should be discarded when considering complex and multiple objective decision problems. Under the modern complex decision environment, it is necessary to simultaneously consider all of the multiple and often conflicting objectives appropriately in selecting a best strategy or policy. Among the various techniques which have been developed to handle multicriteria decision making problems, goal programming is perhaps the most promising approach as it is an appropriate, powerful, flexible, and pragmatic tool. This technique was originally introduced by Charnes and Cooper (2, 3), and further developed by Ijiri (g) and Lee (11). The goal programming model can be solved through the use of a computer program based on an iterative algorithm. Currently, the most widely used computer program is Lee`s program (11) written in Fortran. Another popular algorithm was developed by Ignizio (7). Lee`s and Ignizio`s programs were designed using the modified simplex method. Lee`s and Ignizio`s programs did not consider efficiency in terms of the running time and storage requirements. Computational inefficiency results from unnecessary information being computed from iteration. to iteration. Recently Arthur (1) attempted to design a more efficient algorithm. This algorithm was tested in comparison with Lee`s algorithm in terms of computational time. Arthur`s goal partitioning algorithm is more efficient than the other two algorithms because it reduces the number of computations by modifying the matrix size when the number of subproblems increases and by eliminating unnecessary nonbasic variables. The critical disadvantage of this algorithm is its inability to provide the final optimal simplex tableau required to perform sensitivity analysis. This paper presents a new efficient GP algorithm based on the product represenation of the revised simplex method in order to overcome deficiencies of computational inefficiency on the part of the Lee and Ignizio algorithms and the lack of the final simplex tableau on the part of the Arthur algorithm.
Efficient DFT/DCT Computation for OFDM in Cognitive Radio System
진주,김정기,얀이얼,이문호,Chen, Zhu,Kim, Jeong-Ki,Yan, Yi-Er,Lee, Moon-Ho The Institute of Electronics and Information Engin 2008 電子工學會論文誌-TC (Telecommunications) Vol.45 No.2
본 논문에서는 Cognitive Radio 시스템에서의 DFT와 DCT에 근거한 OFDM을 제시한다. 적응 OFDM은 허가된 사용자의 주파수 간섭을 피하기위해서 개별적인 반송파를 무효화시키는 capacity를 갖는다. 그러므로 OFDM 송신기에서 IDFT/DFT, IDCT/DCT의 입력과 출력이 상당수의 0값을 갖는다. 따라서 DFT와 DCT의 표준 방법은 0에서 필요치 않은 연산 때문에 더 이상 효율적이지 않을 수 있다. 이러한 고찰에 근거하여, 본 논문은 IDFT/DFT, IDCT/DCT를 위한 2차원적(2-D) 단축된 정렬 변환 분해 방법을 보이고, 이 알고리즘이 Cognitive Radion 시스템 환경의 OFDM의 계산을 효율적으로 수행 할 수 있는 방법을 제시한다. In this paper, we address the OFDM based on DFT or DCT in Cognitive Radio system. An adaptive OFDM based on DFT or DCT in Cognitive Radio system has the capacity to nullify individual carriers to avoid interference to the licensed users. Therefore, there could be a considerably large number of zero-valued inputs/outputs for the IDFT/DFT or IDCT/DCT on the OFDM transceiver. Hence, the standard methods of DFT and DCT are no longer efficient due to the wasted operations on zero. Based on this observation, we present a transform decomposition on two dimensional(2-D) systolic array for IDFT/DFT and IDCT/DCT, this algorithm can achieve an efficient computation for OFDM in Cognitive Radio system
진주현(Ju Hyun Jin),유봉석(Bong Seok Yoo),이욱수(Wook Soo Lee),김규호(Gyu Ho Kim) 한국전자통신학회 2016 한국전자통신학회 논문지 Vol.11 No.5
교통사고의 발생의 주요 원인의 대부분은 운전자의 법규 위반 행위이며, 특히 과속 및 불법유턴은 대형 사고로 이어질 잠재적 위험성을 내포한다. 사업용 차량의 경우 불법유턴 위험성에 대한 지각이 부족하고, 단속장비 및 감시 인력 또한 부족한 실정이다. 이에 본 논문에서는 사업용 운전자의 불법유턴 위반행위를 예방하고, 안전운행 습관을 유도하고자, 맵 연동기반 운행행태 판단 기술을 개발에 대해 소개한다. 이를 위해 전국 총 26만개 링크자료 중 23,782 건의 유턴 허용 정보와 14만 6천 건의 제한속도 정보를 수집하였다. 또한 운행행태 분석을 위해 판단알고리즘을 구축하였으며, 최종적으로 안드로이드 기반 애플리케이션을 개발하였다. 개발된 애플리케이션의 맵 매칭, 운행행태 판단 및 기타 데이터 산출의 정확도를 평가하기 위해 테스트를 수행하였으며, 분석결과 맵 매칭은 86%, 운행행태 판단 정확도는 83%로 평가되었다. 또한 정보출력 표출에 대한 정확도는 모두 100%로 평가되었다. 향후 과제로서는 기술의 정확도 향상을 위해 모니터링 시스템 설계가 필요할 것으로 판단되며, 개발된 기술을 활용할 수 있는 서비스 시나리오의 검토가 필요하다고 판단된다. Driving behaviors such as speeding and illegal u-turn which violate traffic rules are main causes of car accidents, and they can lead to serious accidents. Bus drivers are less aware of dangers of illegal u-turn, and infrastructures such as traffic enforcement equipment and watchmen are deficient. This research aims to develop technology for estimating driving behaviors based on map-matching in order to prevent illegal u-turns. For this research, 23,782 of u-turn permit data and 146,000 of speed limit data are collected nationwide, and an estimation algorithm is built with these data. Then, an application based on android is developed, and finally, tests are conducted to assess the accuracy in data computations and GPS data map-matching, and to extrapolate driving behavior. As a result of the tests, the accuracy results in the map-matching is 86% and the assessment of driving behavior is 83%, while the display of the data output yielded 100% accuracy. Additional research should focus on improvement in accuracy through the development of a robust monitoring system, and study of service scenarios for technology application.
선천성 고혈압 흰쥐에서 두릅 에탄올 추출물의 항고혈압 효과
진주연,박은혜,전윤아,이영재,Jin, Ju-Youn,Park, Eun-Hye,Jeon, Yoon-A,Lee, Young-Jae 대한수의학회 2017 大韓獸醫學會誌 Vol.57 No.3
Antihypertensive effects of ethanol extracts of Aralia elata (Miq.) Seem. (AE) were investigated in spontaneously hypertensive rats (SHR). SHR aged 14 weeks were treated for 8 weeks with AE (10 or 50 mg/kg/day) or amlodipine besylate (Am; 10 mg/kg/day) orally. Hypertension results in injury to several organs and can produce a significant increase in malondialdehyde (MDA) content as a result of lipid peroxidation and endothelial dysfunction. In this study, oral administration of AE and Am significantly reduced systolic blood pressure, organ weight index, and MDA content in tissues but increased significantly the plasma nitrite and nitrate concentrations. The endothelium-dependent relaxant activities of acetylcholine ($10^{-10}-10^{-3}M$) in norepinephrine (NE)-precontracted aorta were increased in AE- and Am-treated rats. Particularly strong endothelium-dependent relaxant activities were observed in AE-treated (50 mg/kg) rats. The endothelium-independent relaxant activities of sodium nitroprusside ($10^{-10}-10^{-3}M$) in NE-precontracted aorta were not changed. The results of this study suggest that AE has both antihypertensive and end-organ protective effects in SHR.
진주현(Jin Ju Hyun),이은수(Lee Eun Soo) 성신여자대학교 경영연구소 2010 경영관리연구 Vol.3 No.2
본 연구는 (주)온네트의 국내 온라인 벤처게임기업의 해외진출 과정과 전략에 대한 이슈를 논의하였다. (주)온네트는 한국 온라인게임 산업에서 큰 비중을 차지하는 넥슨, 엔씨소프트, 네오위즈와 같은 1세대 온라인 게임 개발을 시작한 기업으로 소폭의 증가세를 보이면 꾸준히 성장하는 기업이다. 기업의 성장전략의 일환이 해외 진출은 과거 대규모 기업들의 전유물로 여겨졌지만, 최근 (주)온네트와 같은 중소기업의 생존 전략에도 큰 영향을 미치고 있다. 본 연구는 (주)온네트의 해외진출 과정과 전략을 통해 중소 벤처 온라인 게임들의 해외진출 과정과 진출 노력에 대해 알아보고자 한다. This study discusses the subject of overseas entry strategy and process form company of On-Net in Korea online venture. The Onnet corp. one of the first generation online game company with NCsoft, Nexon, and Neowiz Corp. Also, Onnet showed slow growth and stable organization in management performance. Meanwhile, Overseas entry was supposed to be had the large companies in the past. However, recently, it is important to been survived and growing up with building up overseas markets of the small companies such as Onnet Corp. Therefore, this study focused on understanding challenges and dynamics related to internationalization strategy and process of Onnet Inc. and to learn its solution against those challenges.
정량펌프내부 리필밸브의 개폐 간극에서 발생하는 압력강하 해석
진주석(Joo-Seok Jin),김상우(Sang-Woo Kim),신태석(Tae-Seok Sin),이도형(Do-Hyung Lee) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
A three-dimensional numerical analysis was carried out on incompressible flows in the refill valve of check valve type containing ball by using commercial code. A numerical simulation is a useful technique to investigate the physical phenomena of the flow field. This study focused on the flow analysis in the tiny gap between valve body and ball in order to prevent pressure drop of refill valve. Characteristics of complex flows including cavitation effect investigated for different gap's size. when length of tiny gap's size become smaller, speed of fluid is rising rapidly and pressure is on the ebb by Bernoulli's theorem. while the pressure fall off below the saturation vapour pressure, we can saw that happening the cavitation phenomenon in this research.