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이선기,Lee, Sun Ki 한국압력기기공학회 2016 한국압력기기공학회 논문집 Vol.12 No.2
The thermal stratification phenomenon in the nuclear power plant can cause abnormal deformation of the piping, contact with the support, damage to the support system. Repetition of the thermal stratification phenomenon or variation of the thermal boundary layer can cause thermal fatigue. Thermal stratification phenomenon in nuclear power plants is still an ongoing issue and active research has been carried out. In this paper, the current situation in Korean nuclear power plants is described, followed by the status of research and the future problems on the thermal stratification phenomenon in Korea.
이선기,정백순,김창호,Lee, Sun-Ki,Chung, Bag-Soon,Kim, Chang-Ho 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.2
Thermal output in a nuclear power plant is verified with calorimetric heat balance on the secondary plant. The calorimetry involves the precise measurement of the feedwater flow rate. However, the correct indication of feedwater flow rate obtained by a pressure-difference measurement across a venturi can be affected by instrument errors, fouling or a poorly developed velocity profile. This can result in an inaccurate mass flow rate and consequently an inaccurate estimate of power. The purpose of this study is to develop verification methods with accuracy better than $0.5\%$ for high precision flow measurement to be used for measuring feedwater flow rate. This chemical tracer method is a testing process that uses tracers which can be applied to quantify losses in electrical output due to the incorrect measurements of feedwater flow rate. And this system has good response to the variation of the flow rate. Accuracy of better than 0.5 percent can be expected for feedwater flow measurement, providing that the system can be stabilized during the test. This methodology is applicable to other flow systems well.
이선기,Lee, Sun-ki 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.1
For the improvement of the pump characteristics in the partial capacity range, it must be verified that the influence of the impeller design factor on the internal flows and the influence of the impeller internal flows on the pump characteristics. In this paper, in order to understand the influence of outlet angles on flow conditions and characteristics of a mixed flow pump, experiments were carried out for four kinds of impeller, which have the same inlet angle distributions and meridional section shapes. Results shown that separation and stall in the partial capacity range were enlarged by the outlet angles. The relationship between the separation and the stall at the impeller and the discharge flow conditions were clarified.
고온/고압용 집진장치 및 역세정 시스템 설계를 위한 전산 유동해석
이선기 ( Sun Ki Lee ),정석우 ( Seok Woo Chung ) 한국공업화학회 2010 응용화학 Vol.14 No.1
전산유체역학을 이용하여 집진 및 역세정 장치의 유동특성 해석을 진행하였는데, 해석에서는 고온/고압 시스템에 적용하기 위한 집진장치를 대상으로 하였으며, 이를 통해 집진시스템 전체의 유동 및 온도분포, 입자거동 등을 파악하였다. 해석결과에 의하면 집진장치 내부에 원통형 격벽을 설치함으로써 집진필터의 입자부하를 최소화 할 수 있는 것으로 나타났으며, 역세정 노즐 및 벤추리 부분은 기존의 방식과 본 연구의 설계안을 비교하여 장단점을 파악할 수 있었는데 분진이 누적되지 않은 상태에서는 기존의 벤추리 노즐 방식이 적은 양의 역세정 가스로 우수한 역세정 효과를 나타내지만, 일반적인 운전조건에서는 필터표면에 달라붙는 분진 부하에 의해 본연구의 설계안이 높은 효율을 가지는 것으로 확인되었다.
남자 프로배구 경기력 수준과 블로커 수에 따른 공격 성공확률 분석
이선기(Lee, Sun-Ki),김종원(Kim, Jong-Won),최형준(Choi, Hyong-Jun) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.5
This study aimed to analyze the successful rate of attack through team performance quality and the number of blockers in Korean men’s professional volleyball league during 2019/2020 season. A total of 30 matches from top quality two teams and bottom quality two teams were selected as a sample. Descriptive statistical analysis was firstly conducted to determine the frequency of attack attempt, completion and successful rate according to team performance quality and the number of blockers. And then Independent samples test, One-way ANOVA, and Two-way ANOVA test were performed to determine whether there were differences of performance indicators between different situations. The results showed that the successful rate of attack was the highest against one blocker whilst the lowest against three blockers. Also, top quality teams had higher successful rate of attack compared to low quality teams and the successful rate of attack of teams against top quality was higher than against low quality teams. The results could suggest when attempting an attack it is advantageous to use paint moves such as time-difference attacks, quick attacks, etc. to beat the blockers of defending team.
이선기(Sun-Ki Lee),이상국(Sang-kook Lee),김태룡(Tae-Ryong Kim),송택호(Taek-Ho Song),권종주(Jong-Ju Kwon),정일석(Ill-Suk Jung),홍승열(Seung-Ryul Hong) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
During the nuclear power plant periodical inspection, the crack was detected at the reduce pressure orifice down stream in the CVCS(Chemical& Volume Control System). This Paper examined the degradation mechanism of reduce pressure orifice of CVCS by the measuring vibration and frequency analysis, internal flow pattern analysis. Results show that the degradation of the reduce pressure orifice was caused cavitation, and suggest design improvement plan for damage prevention.
인센티브 시스템이 수입대리인의 성과에 미치는 영항 : 한국 중소기업을 중심으로
이선기(Sun-Ki Lee),최창범(Chang-Bum Choi) 한국국제상학회 2021 國際商學 Vol.36 No.1
본 연구의 목적은 한국 수출기업의 금전적 및 비금전적 인센티브가 해외 수입대리인의 규정준수, 헌신, 기회주의적 행동에 어떠한 영향을 미치는지와 나아가 이와 같은 행동이 긍정적 역할수행에도 영향을 미치는지 분석하는 것이다. 이를 위해 비금전적인 인센티브를 제공하면 수입대리인의 규정을 준수하고 헌신을 하는 수준이 높아지는 반면에 금전적 인센티브를 제공하면 기회주의적 성향이 높아질 수 있다고 가설을 설정하였다. 국내 189 수출기업을 설문해서 얻은 자료를 비추어 보면, 비금전적 인센티브를 지급 받았을 때 수입대리인의 규정준수와 헌신의 정도는 금전적 인센티브가 제공 되었을 때 보다 높은 현상을 보이며 연구가설을 뒷받침하였다. 전반적으로 연구결과는 수출기업이 비금전적 인센티브를 적극적으로 활용할 때, 수입대리인의 긍정적 역할 수행은 향상됨을 보여주었다. 본 연구는 비금전적, 금전적 인센티브 모두 효율적으로 제공이 되었을 때 수출기업과 수입대리인의 거래관계에 긍정적인 효과를 가지고 온다는 점을 시사했다. 이어서 수출기업이 보다 다양한 인센티브를 제공한다는 것은 수출을 통한 해외시장 진출 시 향상된 성과를 가져온 다는 것을 의미하였다. Purpose : The purpose of this paper is to investigate how the exporters’ compensation plan affects the importers’ role performance. The exporters’ compensation plan is examined along two dimensions: monetary vs. non-monetary incentives. Research design, data, methodology : The survey indicated that besides monetary incentives, non-monetary incentives also encourage importing agents to comply with regulations and commit to the exporters with a higher dedication. However, importers were found to act more opportunistically if they receive monetary incentives only. Results : The findings suggest that non-monetary incentives are as important as monetary incentives in improving the importers’ role performance. In short, the importers’ role performance is improved when non-monetary incentives are actively in place, and their levels of compliance, opportunistic behaviors, and commitment play the mediating roles. Conclusions : This paper outlines the effectiveness of each type of incentives provided by exporters as means to improve the importers’ role performance.