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최영석,이경용,이창한,이종훈,Choi, Young-Seok,Lee, Kyoung-Yong,Lee, Chang-Han,Lee, Jong-Hun 한국유체기계학회 2003 한국유체기계학회 논문집 Vol.6 No.2
ADC (Automatic Discharge Connector) is commonly used for the easy maintenance of the submersible pumps. However, the small gap between the flange of the base plate and that of the pipe due to the head rise, the flow momentum change and the mis-installation make a leakage flow that may be a great loss to the pumping system. In this study, the performance degradation was predicted with the simple leakage flow model through the gap. The newly developed ADC was tested, and the leakage performance was compared with the old one and also no-leakage piping system. The newly developed ADC reduced the leakage flow in a satisfactory way in comparison with the old model.
최영석,김덕수,윤준용,Choi Young-Seok,Kim Deok-Su,Yoon Joon-Yong 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.4
In this study, the effect of flow settling means on the performance of fan tester were numerically investigated by using a computational fluid dynamics(CFD). The airflow rate was calculated from the pressure differential across a flow nozzle in the measuring plane and the flow settling means were generally installed in the chamber of the fan tester to provide proper airflow patterns ahead of the measuring plane. The predicted nozzle differential pressures with uniform inlet velocities were compared with the values of the ANSI/AMCA 210-99 to verify the performance of the commercial CFD code CFX 5.6. The influence of flow settling means on the measurement of airflow rate in a fan tester were discussed with various porosities and inlet jet velocities. The results obtained show that the proper band of porosities exist to meet the AMCA standard in a specified inlet jet velocity.
최영석,이용갑,홍순삼,강신형,Choi, Young-Seok,Lee, Yong-Kab,Hong, Soon-Sam,Kang, Shin-Hyung 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.1
A commercial CFD code is used to compute the 3-D viscous flow field within the impeller of a centrifugal pump. Several preliminary numerical calculations are carried out to determine the influence of the parameters such as the grid systems, the numerical schemes, the turbulence models and the shape of the vaneless diffusers at the design flow rate. The results of the preliminary study are used for the calculation of the off-design flow conditions. The circumferentially averaged results such as the radial and tangential velocities, the exit flow angle, the slip factor, the static pressure and the total pressure are compared with the experimental data at the impeller exit to discuss the influence of the prescribed parameters.
최영석,심재혁,강신형,Choi, Young-Seok,Shim, Jae-Hyeok,Kang, Shin-Hyoung 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.1
In this study, the performance prediction programs for centrifugal pumps are developed. To estimate the losses in the centrifugal pump impellers, a two-zone model and TEIS(two elements in series) model are applied to the program. The basic concept of a two zone model considers the primary zone that is an isentropic core flow and the secondary zone that has a non-isentropic region at the impeller exit. The flow goes through two different zones and is mixed out at the impeller exit and the mixing process occurs with an increase in entropy, a decrease in total pressure. The level of the core flow diffusion in an impeller was calculated using TEIS(two elements in series) model. The effects of various parameters which are used in this program on the prediction of head and efficiency are discussed. The correlation curves used to select the effectiveness of the primitive TEIS model were suggested according to the specific speed of the centrifugal pumps.
최영석,이경용,강신형,Choi, Young-Seok,Lee, Kyoung-Yong,Kang, Shin-Hyoung 한국유체기계학회 2003 한국유체기계학회 논문집 Vol.6 No.2
The periphery pump (or regenerative pump) has been generally applied in the automotive fuel pump due to their low specific speed (high heads and small flow rate) with stable performance curves. In this study, the performance prediction of side channel type periphery pumps has been developed. The prediction of the circulatory flow rate is based on the consideration of the centrifugal force field in the side-channel and in the impeller vane grooves. For the determination of performance curve (head-flow rate), momentum exchange theory is used. The effects of various geometric parameters and loss coefficients used in the performance prediction method on the head and efficiency are discussed, and the results were compared with experimental data.
공간구문론을 활용한 월미관광특구의 관광호텔 배치특성 분석 -월미도권 관광호텔의 위상학적 접근성을 중심으로-
최영석 ( Choi Young-seok ),성보현 ( Seong Bo-hyun ) 한국사진지리학회 2018 한국사진지리학회지 Vol.28 No.1
본 연구는 공간구문론을 활용하여 월미관광특구의 관광호텔 배치특성을 분석하는데 목적을 두고 수행되었다. 연구목적 달성을 위해 공간구문론, 관광특구에 대한 문헌연구와 월미도권의 관광호텔에 대한 기본분석 및 위상학적 접근성 분석을 실시하였다. 기본분석 결과, 월미도권의 관광호텔은 바다와 근접한 월미문화거리 후면의 도로를 중심으로 분포되어 있었다. 또한, 공간구문분석을 통한 관광호텔의 전체통합도는 1.0이상으로 접근성이 양호한 것으로 분석되었으며, 위상학적 접근성이 가장 높은 도로축 주변으로 배치되어 있었다. 한편, 본 연구에서는 도심지·휴양지와 같은 관광공간의 성격에 따라 관광호텔의 전략적 배치가 필요하며, 월미도권 내 위상학적 중심성과 교차점 등을 고려한 관광안내시설의 재정비 필요성을 제시하였다. The purpose of this study is to analyze the layout characteristics of Wolmido area tourist hotels using space syntax. In order to accomplish the purpose of research, we conducted literature research on space syntax and tourism special zone. Next, we analyzed the basic analysis and topological accessibility of Wolmido area tourist hotels. As a result of the basic analysis, the tourist hotels of Wolmido area was arranged around the road on the back of Wolmi cultural street near the sea. Also, the global integration of tourist hotels through space syntax analysis is above 1.0, which means that accessibility is good. In addition, it is analyzed that the tourist hotels are arranged around the road with the highest topological accessibility. On the other hand, this study suggests the strategic arrangement of tourism hotels according to the characteristics of tourist area like downtown and resort area. Also, the necessity of rearrangement of tourist information facilities considering the topological center point and crossing point in Wolmido area was suggested.
최영석 ( Choi Young-seok ),성보현 ( Seong Bo-hyun ),유기준 ( Ki Joon Yoo ) 한국사진지리학회 2017 한국사진지리학회지 Vol.27 No.3
본 연구는 제주 올레길의 환경적 특성이 다른 구간별 방문자들의 이용 밀집수준에 대한 인식의 파악을 목적으로 수행되었다. 이를 위해 제주 올레길의 생태적·물리적·사회적인 환경 특성을 고려하여 3가지 유형을 구분하여 각 구간별로 방문자 대상의 설문조사를 실시하였다. 분석결과, 자연성이 높은 구간인 지미오름에서 시야·소음·접촉·행동 등 밀집에 대한 인식요소에 대해 방문전보다 방문후에 보다 더 긍정적인 것으로 나타났다. 조사대상 구간 모두 현재 이용객 수에 대에서는 전반적으로 현재 이용밀도가 적정하다고 평가하였다. 또한, 방문자의 밀집에 관련하여 소음 항목이 만족도에 유의한 영향을 미치고 있는 것으로 나타났다. 이러한 결과는 외돌개 구간의 특정 혼잡구역에 대한 이용 밀도 조절 및 안전관리, 일반 관광객과의 이동동선 분리 등의 필요성을 시사하며, 이와 더불어 방문자 만족도 제고를 위해서는 특히, 방문자들에 의한 소음관리가 필요할 것으로 판단된다. The purpose of this study is to analyze the visitors’ perception of the crowding level in Jeju Olle trails. For this purpose, Olle trail routes were classified into three types based on it’s ecological, physical and social environment characteristics and a questionnaire was conducted for each type of trails. As a result, visitor perception level for visual, noise, contactual, and behavioral perceiving elements on site was more positive than expected level in Jimioleum route. In addition, it is assessed that the current crowding level is adequate in terms of number of visitors. A noise item in the visitor crowding have been shown to have a significant impact on the satisfaction level. These findings include the need to control visitor numbers, to separate genera travel routes, and to manage visitors’ safety in the congestion zones of the oedolgae section. And, there is necessary to manage noise by visitors, especially in order to improve visitor satisfaction.