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2축(軸)2타선(舵船)의 조종운동 추정(推定)에 관한 연구
이승건,김윤수,이승재,Lee, Seung Keon,Kim, Yoon Su,Lee, Seung Jae 대한조선학회 1996 大韓造船學會 論文集 Vol.33 No.4
1축 1타선에 대한 조종운동 수학모델은 통상적인 경우 이미 확립되어 널리 사용되고 있다. 또한 저속이나 천수역에서의 조종운동계산에도 응용되고, 새로운 국면의 조종운동 해석에도 기존의 조종수학 모델이 근간이 되고 있다. 한편 2축 2타선과 같은 특수선형에 대해서는 Lee 등에 의한 상세한 구속모형시험 결과로 그 특성이 알려지게 되었고, 1축 1타를 기본으로 하는 기존 수학모델에 약간의 수정을 가함으로서 충분이 조종운동을 추정할 수 있음을 보였다. 본 논문에서는 2축 2타선에 대한 Propeller Effective Wake($1-w_p$)와 유효중립타각 (Effective Neutral Rudder Angle) ${\delta}_R$에 대한 추정모델을 제안하고, Hull의 유체력에 관해서도 Inoue의 추정식을 사용하여, 초기설계단계에서 선박의 주요치수, Propeller 및 타 제원만으로서 개략적인 2축 2타선의 조종운동 계산을 가능하도록 하였다. 이 추정법에 의한 조종운동 계산결과를 엄밀한 구속모형 시험 Data에 의한 계산과 비교하여, 본 논문에서 제안된 추정법의 유용성을 검증하였다. Mathematical model of maneuvering motion for a single-screw single-rudder ship established and versatile applications to the special situations of maneuvering are attempted. While, the mathematical model for twin-screw twin-rudder ship is not presented so much, because that type of ship is not popular. Lee et al. have examined the characteristics of such ship by captive model tests in 1988. This paper treats new mathematical models for propeller effective wake ($1-w_p$) and effective neutral rudder angle ${\delta}_R$ in the case of twin-screw twin-rudder ship. And some maneuvering motions are calculated with proposed models and compared with exact simulations.
이승건,이경우,이승재,정성룡,Lee, Seung-Keon,Lee, Gyoung-Woo,Lee, Seong-Jae,Jeong, Sung-Ryong 한국항해항만학회 1997 한국항해학회지 Vol.21 No.4
Along with the rapid growth of shipping and transportation , the size of a ship larger and larger. Low speed maneuverabililty of a full ship has been received a great deal of attention concerting about the navigation safety, especially in the harbour area of waterway. And, the iperation of the full ship in harbour area is one fo tehmost difficult technique. Usually highly experienced experts can make a suitable decision considering various propeller ,rudder actions and environmental conditions. The Artificial Neural Network is applied to the automatic berthing control of a ship. The teaching data are made by the berthing simulation of a ship on the computer. And, the layer neural network is used and the 'Error Back-Propagation Algorithm' is used to teach the neural network. Finally, it is shown that the berthing control is successfully done by the established neural network.
VRF시스템을 통한 냉방 시 기류변화를 이용한 설정온도의 확장이 재실자의 쾌적성과 에너지 소비량에 미치는 영향 분석
이승건(Seung Keon Lee),박소현(So Hyun Park),김주욱(Joo Wook Kim),송두삼(Doo Sam Song) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.11
Variable refrigerant flow(VRF) systems are known as their high energy performance, and the number of installations of VRF systems in buildings is increasing. In this study, extension of the set-point temperature of VRF system was analyzed by field measurement. The extension of the set-point temperature of VRF system without sacrificing occupants’ thermal comfort can be achieved by adjusting the airflow characteristics in cooling. In this study, the effect of extending the set-point temperature of VRF system by using the airflow mode in cooling on occupants’ thermal comfort and energy saving were analyzed by field measurement in an office building. The results showed that the set-point temperature can be extended to 26.5℃ while ensuring occupants’ thermal comfort by using airflow mode proposed by this study. Energy consumption can be reduced by 25% compared to the case of set-point temperature was 26℃ and 35% for the case of set-point temperature was 25℃. In addition, about 88% of occupants reported to be thermally comfortable at extended set-point temperature conditions that adjust airflow in cooling mode of VRF system.
바닥 복사난방 구조체에 방열판 추가에 따른 축열능력 향상 및 에너지 절감효과의 분석
이승건(Seung Keon Lee),김민경(Min Kyung Kim),박병용(Beung Yong Park),송두삼(Doo Sam Song) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
Adding heat sink to the radiant floor heating structure, the floor surface temperature becomes uniform, indoor radiant temperature is ascend, and heating energy is also reduced. This is because adding a heat sink improves the heat storage capacity of the radiant floor heating structure. The purpose of this study is to analysis of the heat storage performance and energy saving effect by adding heat sink to the radiant floor heating system by full scaled field measurement. A lot of heat flow meter and thermocouples were installed on the floor and surround wall surface to measure the amount of heat dissipation into the room and the heat storage amount of the floor structure. The heat storage capacity was calculated by the thermal equilibrium equation and the structure temperature gradient. With the measuring the three item, boiler input heat flow, indoor heat dissipation, floor structure heat storage, the improvement of heat storage capacity and heating performance with adding the heat sink in radiant floor heating system were analyzed. By adding a heat sink, the heat storage capacity of the floor structure was improved by about 12%, and as a result, an energy saving effect of about 22% was obtained.
이승건(Seung Keon Lee),손경호(Kyung Ho Sohn),이상의(Sang Eui Lee),황성준(Sung Jun Hwang),서정호(Jung Ho Seo) 한국항해항만학회 2005 한국항해항만학회 학술대회논문집 Vol.3 No.-
본 논문에서는 수중운동체의 운동수학모형 정립 및 최적제어 방안 연구를 위해, 수중운동체의 6자유도 운동 방정식을 유도하고, UUV 모형의 사항시험을 통해 6방향의 유체력을 구하였다. In thi per 6-DOF moion eqatons of UUV (Unmanned Undersea Vehicles) are derived. Moreover, th hydrdynmic maneuverng derivatives are found rom the obliqu twing tests of te 2m Manta type UUV model.
이승건(Seung-Keon Lee),이용원(Yong-Won Lee) 한국항해항만학회 2002 한국항해항만학회지 Vol.26 No.2
우리나라 대부분의 어선은 침수 및 전복에 의해 야기되는 해양사고에 있어 그 빈도가 높으며, 특히 24m이하의 소형어선에서 두드러진다. 그럼에도 불구하고 소형어선에 대한 복원성 기준이 없을 뿐 아니라 소형어선의 복원성 자료를 찾기란 그리 쉽지 않다. 이에 본 연구에서는 90년 이후 표준어선으로 고시되어 건조 실적이 있는 실적선 10척에 대해 계측된 자료를 활용하여 이를 기초로 Genetic Programming을 이용한 GM 추정식을 도출하였다. 또한 국외 복원성 기준과 GP 추정식을 이용 각각에 대해서 GM을 평가하여, Genetic Programming에 의한 GM추정의 타당성을 보였다. 하지만, 이러한 결과값이 사용되기 위해서는 보다 많은 실적선 Data를 이용한 추론이 요구된다. In Korea, most of small fishing vessels whose lengths are under 24m frequently cause maritime accidents due to flood and capsize. In this situation, however, there are no stability criteria and data for small fishing vessels. In this paper, the authors investigated data of 10 real ships which were built since 1990, and derived equations for evaluating ship’s stability using Genetic Programming. Also, the validity of GM estimation using Genetic Programming was shown with comparison of GM value by foreign standards. More data of real ships are needed for the application of these theory to ship design process.
이승건(Seung-Keon Lee),손경호(Kyung-Ho Sohn),이상의(Sang-Eui Lee),황성준(Sung-Jun Hwang),서정호(Jung-Ho Seo) 한국항해항만학회 2005 한국항해항만학회지 Vol.29 No.8
본 논문에서는 수중운동체의 운동수학모형 정립 및 최적제어 방안 연구를 위해, 수중운동체의 6자유도 운동 방정식을 유도하고, UUN 모형의 사항시험을 통해 6방향의 유체력을 구하였다. In this paper, 6-DOF motion equations of UUV (Unmanned Undersea Vehicles) are derived. Moreover, the hydrodynamic maneuvering derivatives are found from the oblique towing test of the 2m Manta type UUV model.
장기측정을 통한 바닥복사난방에서 방열판 추가에 따른 실내 온열쾌적성 향상 및 난방에너지 절감효과 분석
이승건(Seung Keon Lee),김민경(Min Kyung Kim),박병용(Beung Yong Park),송두삼(Doo Sam Song) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
The purpose of this study is to improve heat transfer rate and heat storage capacity by adding the heat sink in radiant floor heating system, which is widely used in residential building in Korea. In this study, a long-term measurement was accomplished to analyze the effect of the heat sink on indoor thermal environment and energy consumption of the radiant floor heating. The experiment was conducted by 7.5m × 4.6m test cell. Cell #1 represents a set up of conventional radiant floor heating system without heat sink, and Cell #2 represents a set up of the analyzed radiant floor heating system with heat sink. One side of the test cell is exposed to the outdoor and three side of the test cell is on the indoor. The experimental conditions were the same. Indoor set-point temperature was 24℃ and the test cell was heated by electric boiler. As results of the long-term measurement, the total heating energy consumption was reduced about 11% when the heat sink was applied to the radiant floor heating system (Cell #2) compared to the conventional system (Cell #1). In addition, the indoor MRT(Mean Radiant Temperature) was ascended due to the uniformity of the floor surface temperature in Cell #2. This results in high OT(Operating Temperature) in Cell #2. The results show that the heating energy use can be reduced and indoor thermal comfort is improved by adding the heat sink in radiant floor heating system.