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김창석,황석영,서진연,정삼용 조선대학교 동력자원연구소 1995 動力資源硏究所誌 Vol.17 No.1
This paper describes the proper selection method of the power system stabilizer(PSS) parameter for stabilizing operation of a synchronous machine which connected to infinite bus by using pole assignment method. The purpose of PSS is to enhance the damping capability at small frequency oscillation (0.5∼2㎐). It can be achieved by moving the real part of critical eigenvalue (pole) on left side of s-plane. The PSS parameter was selected by using the proposed method to match with a pre-assigned pole associated with poorly damped swing mode. This method has been studied to synthesize the PSS on Yong-Gwang N/P. And the simulation results show that the selected parameter by using proposed method is effective for dynamic and transient stability of power system.
沈相弼,李承洪,李楨烈,文善五 홍익대학교 1995 弘大論叢 Vol.27 No.-
Il 's agit d' une analyse succinte sur le syste´me mone´taire europe´en en place. Apre`s avoir etudie´ le me´canisme de ce que on appelle le "serpent mone´taire", nous avons e´largi nos e´tudes sur l' union e´conomique et mone´taire pour savoir si sa re´alisation serait possible. Le syste`me de l' ECU. comme moyen de paiement europe´en, et comme l' exemple de la future monnaie commune ou unique est analyse´ dans ses aspects divers. Pour conclure. nous avons analyse´ la situation actuelle, mone´taire et e´conomique afin de pouvoir pronostiquer sur l' avennir.
Lee, Jung-Sook,Chun, Chang-Ouk,Kim, Hong-Joong,Joo, Yun-Jung,Lee, Hun-Joo,Park, Chan-Sum,Park, Yong-Ha,Mheen, Tae-Ick The Microbiological Society of Korea 1996 The journal of microbiology Vol.34 No.3
The cellular fatty acid methyl esters (FAMEs) analysis data obtained for clusters defined at a Euclidian distance of 17.5, in the classification of lactic acid bacteria isolated from kimchi, described by Lee et al. (4), was used for the identification of 79 Leuconostoc isolates. The test strains were isolated using a selective isolation medium specific for the genus Leuconostoc. These strains were then characterized according to their fatty acid profiles. The results show that all seventy nine test strains were identified to the known Leuconostoc clusters B, C, and D. Cluster B had the highest relative amount of the saturated fatty acid 16 : 0. The saturated fatty acid 16 : 0 and summed feature 9 were found as a major components in cluster C, which had a higher level of summed feature 9 than cluster B. Cluster D is characterized by the highest relative amount of the unsaturated fatty acid 18 : 1 w9c. It is suggested that FAMEs analysis can be successfully applied in the identification of lactic acid bacteria isolated from kimchi.
Optoelectric Properties of Gate-Tunable MoS<sub>2</sub>/WSe<sub>2</sub> Heterojunction
Sum-Gyun Yi,Joo Hyoung Kim,Jung Ki Min,Min Ji Park,Young Wook Chang,Kyung-Hwa Yoo IEEE 2016 IEEE TRANSACTIONS ON NANOTECHNOLOGY Vol. No.
<P>Two-dimensional transition-metal dichalcogenides semiconductors are attractive materials for optoelectric devices because of their direct energy bandgap and transparency. To investigate the feasibility of transparent p-n junctions, we have fabricated heterojunctions consisting of WSe2 and MoS2 since WSe2 and MoS2 with proper electrode metals exhibit p-type and n-type behaviors, respectively. These heterojunctions showed rectifying behaviors, indicating that p-n junctions were formed. In addition, photocurrent and photovoltaic effects were observed under light illumination, which were dependent on the gate voltage. Possible origins of gate-tunability are discussed.</P>
Low and Intermediate Level Radioactive Waste Certification Program Plan
Sum-JIn Ahn,Tae-Kook Kim,Young-Hee Lee,Ill-sik kang,Jong-Sik Shon,Kwon-Pyo Hong 한국방사성폐기물학회 2006 방사성폐기물학회지 Vol.4 No.2
최근에 개정된 중 저준위 방사성폐기물 인도규정에서는 폐기물시설운영자는 처분 전 방사성폐기물이 인도규정에 적합함을 보장하기 위한 계획을 수립하여 운영할 것을 요구하고 있다. 앞으로 건설될 방사성폐기물 처분시설에서 방사성폐기물 인수 시에 충족되어야할 방사성폐기물인수기준이 수립될 것이며, 이 인수기준에는 물리화학적 및 방사선학적 특성규명, 물리화학적인 제한사항, 금지품목, 포장, 인식표, 라벨, 문서요건 등을 규정할 것으로 예상된다. 이들 규정을 준수하기 위하여 방사성폐기물 발생자는 방사성폐기물이 폐기물 인수기준에 만족하는지를 확인하는 폐기물 인증프로그램을 수행하여 방사성폐기물이 그 기준에 만족하는지 확인하여야 하며, 방사성폐기물에 대한 모든 인증서류를 폐기물 처분시설에 제출할 책임이 있다. 본 방사성폐기물 인증프로그램계획은 한국원자력연구소에서 발생되는 방사성폐기물의 인증프로그램에 대한 예비프로그램으로서 개발된 것이며 앞으로 처분장의 인수요건이 구체적으로 확립될 때까지 수정 보완되어야 한다. The regulation for the low and intermediate level radioactive waste to be transferred to the disposal facility, recently revised, require that radioactive waste generators should set up waste certification program to verify the radioactive waste conform to the waste acceptance criteria(WAC) before disposal. The radioactive waste disposal facility, scheduled to be constructed in Korea, will institute WAC for the wastes to be transferred to the facility. This WAC is expected to compose of the requirements for the radiological characterization, physical and chemical characterization, physical/chemical restriction, prohibited item, packaging, identification, labeling, and documentation. For the compliance with this regulation, The radioactive waste generators should verify that the waste meet WAC through performance of the waste certification program and are responsible for handing in all the certification documents to the disposal facility. This waste certification program plan was set up as a preliminary program for the certification of radioactive waste generated in Korea Atomic Energy Research Institute (KAERI) and should be further revised until preparation of WAC by disposal agent.
Gettig an 'Aha!' with Different Types of Hints
Sum Kwing Cheung,Yik Ching Kong,Yuk Lam Li,Wai Yin Wong,Catherine McBride-Chang 대한사고개발학회 2005 The International Journal of Creativity & Problem Vol.15 No.1
Several theories have proposed that changing representations of insight problems could help overcome mental blocks. Constraint relaxation is one of the effects brought about by hints. This study aimed at investigating the effects of different hints in changing problem representations. ‘SHOULD’ hints were hypothesized to lead participants to the correct path while ‘SHOULD NOT’ hints were hypothesized to eliminate one of the possible paths. Results showed that ‘SHOULD’ hints facilitated insight problem solving by increasing the speed and the number of correct answers given. This study points to the importance of thinking from a different perspective when faced with mental blocks.