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확산텐서 MR 영상을 이용한 백질의 비등방성 측정 및 백질섬유 트래킹: 확산경사자장의 방향수가 미치는 영향
전우선,김재형,홍성우,이종세,김성현 대한자기공명의과학회 2006 Investigative Magnetic Resonance Imaging Vol.10 No.1
Purpose : Recent development of diffusion tensor imaging enables the evaluation of the microstructural characteristics of the brain white matter. However, optimal imaging parameters for diffusion tensor imaging, particularly concerning the number of diffusion gradient direction, have not been studied thoroughly yet. The purpose of this study was to evaluate the influence of the number of diffusion gradient direction on the fiber tracking of the white matter. Materials and methods : 13 healthy volunteers (ten men and three women, mean age 30 years, age range 23-37 years) were included in this study. Diffusion tensor imaging was performed with different numbers of diffusion gradient direction as 6, 15, and 32, keeping the other imaging parameters constant. The imaging field ranged from 1 cm below the pons to 2-3 cm above the lateral ventricle, parallel to the anterior commissure-posterior commissure line. FA (fractional anisotropy) maps were created via image postprocessing, and then FA and its standard deviation were calculated in the genu and the splenium of the corpus callosum on each of FA maps. Fiber tracking of the corticospinal tract in the brain was performed and the number of the reconstructed fibers of the tract was measured. FA, standard deviation of FA and the number of the reconstructed fibers were compared statistically between the different diffusion gradient directions. Results : FA is not statistically significantly different between the different diffusion gradient directions. By increasing the number of diffusion gradient direction, standard deviation of FA decreased significantly, and the number of the reconstructed fibers increased significantly. Conclusion : The higher number of diffusion gradient direction provided better quality of fiber tracking.
전우선(Jeon, Woo-Seon),이응현(Lee, Eung-Hyun),오덕성(Oh, Deog-Seong) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.4
본 연구는 저탄소 녹색도시의 조성을 위해 주요 계획부문과 계획기법을 살펴보고,그 적용실태를 파악해 봄으로서 저탄소 녹색도시 구현에 요구되는 계획적 주안점이 무엇인지 살펴보고자 하였다.이를 위해 저탄소 녹색도시 및 유사 개념에 대한 문헌 및 선행연구 고찰을 통해 주요 계획부문 및 계획요소를 정리하고,전문가 FGI분석을 통해 적합성을 검정하여 계획기법을 도출하였다.또한,전문가 설문조사와 AHP분석을 통해 계획기법의 중요도를 파악해 봄으로서 저탄소 녹색도시 계획의 주요 특성을 파악해 보았다.이와 함께 국내외 사례를 선정하여 도출한 계획기법의 적용실태를 분석하여 계획기법의 중요도와 비교해 봄으로서 계획과 실제의 차이를 살펴보고자 하였다.주요 계획기법으로는 5개 부문,15개의 계획기법을 도 출할 수 있었다.또한,이에 대한 중요도 분석과 사례분석을 종합해 보면,분산집중형 압축개발,보행친화적 교통체계,신재생 에너지 적극 활용,폐기물의 재활용 시스템 구축이 저탄소 녹색도시 계획의 주요한 요소로 파악되었다. The main objective of this study is to find out the main fields and methods to create a low carbon green city. Through the findings, we hope to figure out the matters that must be focused on in order to realize a low carbon green city. In order to accomplish this, we organized the main fields and methods of fulfilling this accomplishment by taking a look at recorded documents and past studies related to the creation of low carbon green cities and related concepts. Then a FGI analysis was performed in order to examine suitability and deduct a planning technique. Also, through professional surveys and AHP analysis, we figured out the importance of planning techniques to understand the main characteristics of planning a low carbon green city. We also selected domestic and foreign cases, analysed the actual conditions of applying the deducted planning techniques, and compared the importance of planning techniques in order to see the difference between our plans and real results. 15 planning techniques were deducted and divided into 5 groups. The importance analysis and case analysis showed the following to be the main elements in planning the creation of a low carbon green city: compact high-density development, a traffic system revolving around pedestrians, active utilization of new and renewable energy, and establishment of a recycling system for waste.
전우선,정원지,김원제,남경원 國立 昌原大學校 産業技術硏究所 2000 産技硏論文集 Vol.14 No.-
HILS(Hardware In Loop Simulation) is an effective means of testing unmanned underwater vehicle under extreme operational conditions and a variety of operational environments. In order to verify the vehicle performance under time-varying pressure conditions, a reliable pressure simulator is vital to an integrated system for the HILS. This paper presents the results of design research for the pressure simulator using pneumatic pressure (nitrogen), a high speed solenoid valve and a PWM control method. The test and evaluation results of the pressure simulator show that the simulator can generate an appropriate level of desired pressure with an average error below 1m depth for time-varying pressure change conditions corresponding to vehicle dynamics. In addition, the levels of overshoot and vibration have been shown to be under the requirements of design specifications.
이중 협상 해법을 이용한 새로운 다중 접속 네트워크에서 자원 할당 기법
전우선 ( Chon Woo Sun ),김승욱 ( Kim Sung Wook ) 한국정보처리학회 2021 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.10 No.8
이중 연결 네트워크(Dual Connectivity Network)는 소몰 셀 기지국(SBS: Smallcell Base Station)의 제한된 자원 문제와 간섭 문제를 완화하기 위해 스몰 셀 기지국과 매크로 셀 기지국(MBS: Macrocell Base Station)이 협력하여 서비스를 지원하는 기술이다. 하지만 이중 연결 네트워크 역시 한정된 자원을 분배해주는 기술이기 때문에 자원 할당 방식은 매우 중요한 문제이다. 그래서 본 논문에서는 이중 연결 네트워크에서 효율적이고 공정한 자원할당을 위해 일반화된 강한 포부 협상 해법(GTABS: Generalizing Tempered Aspiration Bargaining Solution)과 굽타 리빈 협상 해법(GLBS:Gupta and Livne Bargaining Solution)을 이용한 두 단계 자원 분배 알고리즘을 제안한다. 단계 자원 분배 알고리즘은 다음과 같다. 첫 번째 단계인 그룹 자원 분배 알고리즘에서는 GTABS를 이용하여 각 기지국의 무선 자원을 실시간 그룹과 비 실시간 그룹에게 효율적으로 할당한다. 두 번째 단계인 사용자 자원 분배 알고리즘에서는 GLBS를 이용하여 각 그룹으로 나누어진 자원을 각 그룹의 사용자들에게 최적으로 할당한다. 이러한 두 단계 자원 분배 방식은 5G 무선 자원을 최적으로 할당하여 네트워크 시스템 성능 최대화와 사용자 만족도를 동시에 보장한다. 마지막으로 본 논문에서는 성능 평가를 통해 제안된 방식이 서비스 요청 증가에 따라 전체 시스템 처리량, 공정성, 통신 장애율 측면에서 비교 방식들 보다 모두 10% 이상의 효율성을 입증했다. In order to alleviate the limited resource problem and interference problem in cellular networks, the dual connectivity technology has been introduced with the cooperation of small cell base stations. In this paper, we design a new efficient and fair resource allocation scheme for the dual connectivity technology. Based on two different bargaining solutions - Generalizing Tempered Aspiration bargaining solution and Gupta and Livne bargaining solution, we develop a two-stage radio resource allocation method. At the first stage, radio resource is divided into two groups, such as real-time and non-real-time data services, by using the Generalizing Tempered Aspiration bargaining solution. At the second stage, the minimum request processing speeds for users in both groups are guaranteed by using the Gupta and Livne bargaining solution. These two-step approach can allocate the 5G radio resource sequentially while maximizing the network system performance. Finally, the performance evaluation confirms that the proposed scheme can get a better performance than other existing protocols in terms of overall system throughput, fairness, and communication failure rate according to an increase in service requests.