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        • KCI등재

          A review on angle resolved photoemission spectroscopy studies of Fe-based superconductors

          서정진,김창영 한국초전도.저온공학회 2014 한국초전도저온공학회논문지 Vol.16 No.2

          Since the discovery of iron-based superconductors in 2008, extensive and intensive studies have been performed to find themicroscopic theory for the high temperature superconductivity in the materials. Electronic structure is the basic and essentialinformation that is needed for the microscopic theory. Experimentally, angle resolved photoelectron spectroscopy (ARPES) is themost direct tool to obtain the electronic structure information, and therefore has played a vital role in the research. In this review, wereview what has been done so far and what is needed to be done in ARPES studies of iron-based superconductors in search of themicroscopic theory. This review covers issues on the band structure, orbital order/fluctuation, and gap structure/symmetries as wellas some of the theories.

        • KCI등재

          풍성 카테타를 이용한 식도 성형술

          서정진 대한영상의학회 1990 대한영상의학회지 Vol.26 No.2

          Most benign esophageal strictures can be successfully dilated with conventional bougienage technique. But occasionally strictures are so tight, lengthy, or sometimes irregular that this technique fail and surgical intervention is required. Since 1974 Gruentzig balloon catheter has succeeded when used for strictures in the cardiac and peripheral vasculatures, the biliary and urinary tracts, the colon of neonates after inflammatory disease and also in the esophagus. fluoroscopically guided balloon catheters were used to dilate 30 esophageal strictures in30 patients over 3 years at department of Diagnostic Radiology Chonnam University, College of Medicine. The distribution of age was from 7 years to 71 days and the ratio of male to female was 15 : 15. The causes of benign stricture (23 cases) were post-operative strictures (13), chemical (4), achalasia 93), chronic inflammation (2), esophageal rupture 91) and those 0f malignant stricture 97 cases) were post-radiation stricture of primary esophageal cancer 96) & metastatic esophageal cancer 91). The success rate of procedure was 93% (28/30). The causes of failure were the failure of passage of stricture due to markedly dilated proximal segment of esophagus 91 case) and too long segment of stricture (1 case). Complication of procedure was the diverticula-formation of esophagus in 3 cases, but has no clinical significance in follow-up esophagography. In conclusion, fluoroscoically guided ballon dilation of esophageal stricture appears to be safe, effective treatment and may be have theoritical advantages over conventional bougienage and also should be considered before other methods of treatment are used.

        • KCI등재
        • KCI등재

          저압배전선로 전압안정화를 위한 상태관측과 반복제어를 적용한 무효전력 보상기

          서정진,김영록,차한주 대한전기학회 2020 전기학회논문지 Vol.69 No.11

          In this paper, a new reactive power control algorithm using a stat observer and repetitive control for voltage adjustment to the low-voltage distribution line is proposed and verified by simulation and experiment. A reactive power compensator has a single -phase full bridge inverter structure and consists of DC voltage controller to maintain a constant DC voltage, and current controller for reactive power generation. A DC ripple compensation method use an output from the state observer and the output is used as the DC voltage controller feedback to regulate the DC voltage constant. In order to inject a stable reactive power, the fundamental component of current is controlled by a PI controller, and a repetitive controller is connected in parallel with the PI controller to compensate for lower-order harmonics. The repetitive controller, as implemented in the synchronous coordinate system, serves to eliminate low-order odd harmonic components. The proposed control technique is experimented with a ±5kVar single phase inverter system and verified the performance of the proposed algorithm by confirming that THD is reduced to 2% from 9%.

        • KCI등재

          PF대출 분석기법을 활용한 부동산개발사업 사업성 평가 개선 연구

          서정진,Seo,,Jeong-Jin 한국국토정보공사 공간정보연구원 2014 지적과 국토정보 Vol.44 No.2

          2002년 최초 도입된 한국의 부동산투자회사(이하, 리츠)는 크게 3가지 형태가 있다. 한국거래소에 상장된 각각의 리츠는 그 특성이 다르지만 모두 부동산투자회사 종목으로 분류된다. 현행 "부동산투자회사법"은 그 개별 특성을 반영하지 못하고 일률적으로 적용되고 있다. 일부 리츠는 입법취지와는 달리 상장폐지되어 투자자의 투자손실을 야기하는 등 개별 리츠에 따라서는 법제도 운영이 적절하게 이뤄진다고 보기 어려운 일이 발생하였다. 본 연구는 부동산투자회사의 사업타당성 측면에서 동제도의 활발한 운용지원 방안 마련을 목적으로 한다. 부동산 개발 관련 부동산금융기법으로서 PF 평가분석시스템을 개선하여 리츠사업 타당성을 제고시킴으로써 리츠부문 활성화를 위한 정책방향을 제시한다. 리츠 관련 정책은 리츠회사 종류에 따른 차이를 고려하지 않은 일괄적인 제도 운영으로 부동산 시장을 주도하지 못하고 시장상황에 따라 대응하는 대증처리방식으로 운용되어 왔다고 할 수 있겠다. 리츠를 활용한 부동산금융의 고도화를 통하여 건설자금의 원활한 흐름과 상장된 리츠종목에 대한 일반투자자의 적정한 투자를 위한 정책이 실현되어야 할 것이다. 본 연구 결과는 시중부동자금의 투자흐름을 적절하게 유도하고 간접금융투자의 활성화를 위한 부동산 관련 정책에 반영하기 위한 정책 기초자료로 활용하고자 한다. There are three forms of REITs company in Korea that was first introduced in 2002. Each REITs have been listed on the KRX, its characteristics are different, but it is classified as a REITs company in all events. REITs current methods are applied uniformly manner that does not reflect the characteristics of the individual. REITs some, that is not seen unlike legislative intent, it is delisted, such as generating an investment loss of investors. In this study it is an object of the invention from the point of view of REITs business validity, to draw up operational support aggressive plans of the scheme. By improving the PF assesment system, to improve the relevance of REIT business and presenting policy direction to the activation of REITs. Through the sophistication of real estate finance utilizing REITs, policy for proper investment of general investors REITs funds were listed with the smooth flow must be realized. The results of this study, it can be utilized as basic data for policy to reflect the real estate policy for activation of the indirect financial investments.

        • KCI등재
        • KCI등재

          1, 3-Oxazine화합물로부터 4-Hydroxy-2-Methyl-N-(Cyclohexyl)-2H-1, 2-Benzothiazine-3-Carboxamide-1, 1-Dioxide 의 합성

          서정진,홍유화 대한약학회 1987 약학회지 Vol.31 No.4

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          2-Cyclohexylimino-3-cyclohexyl-5-methyl-4-oxo-2H, 5H-1, 3-oxazino [5,6-C]-1, 2-benzothiazine-6,6-dioxide 2 was hydrolized in d-HCl/$CH_3$CN to give 5-methyl-3-cyclohexyl-2H, 5H-1, 3-oxazino [5, 6-C]-1, 2-benzothiazine-2, 4(3H)-dione 6, 6-dioxide 3 in 82% yield. The alkaline hydrolysis of 3 afforded to 4-hydroxy-2-methyl-N-(cyclohexyl)-2H-1, 2-benzothiazine-3-carboxamide-1, 1-dioxide 4 in 88% yield. On the other hand 3 was synthesized from 4 and ethylchloroformate on the reversed procedure.

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