• 한국자동차공학회논문집
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• 제5권2호
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• pp.13-22
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• 1997

Power flow characteristics of a hydro-mechanical transmission system(HMT) are investigated for tracked vehicle in steering. A HMT consisting of two hydrostatic pump motors(HST), several planetary gear trains and steer differential gear is considered. In order to obtain the direction and magnitude of the power flow of the HMT, network theory for the general power transmission is used. Network model for the HMT in steering is developed, which consists of shafts, nodes and transmission elements such as clutch, gear, etc. Power flow analysis procedure consists of two stages : (1) traction force analysis in steering, (2) power flow analysis in HMT. Torque and speed of every transmission element of the HMT is determined from the network analysis. Also, efficiency, mechanical and hydraulic power loss including HST, are obtained. In addition, the regenerative power flow resulting from steering can be studied in graphic display. The power flow analysis program(PCSTEER) developed in this work can be used as a useful design tool for the tracked vehicle with HMT.

• International Journal of Naval Architecture and Ocean Engineering
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• 제5권2호
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• pp.210-226
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• 2013

Ever since the Arctic region has opened its mysterious passage to mankind, continuous attempts to take advantage of its fastest route across the region has been made. The Arctic region is still covered by thick ice and thus finding a feasible navigating route is essential for an economical voyage. To find the optimal route, it is necessary to establish an efficient transit model that enables us to simulate every possible route in advance. In this work, an enhanced algorithm to determine the optimal route in the Arctic region is introduced. A transit model based on the simulated sea ice and environmental data numerically modeled in the Arctic is developed. By integrating the simulated data into a transit model, further applications such as route simulation, cost estimation or hindcast can be easily performed. An interactive simulation system that determines the optimal Arctic route using the transit model is developed. The simulation of optimal routes is carried out and the validity of the results is discussed.

• 한국실내디자인학회논문집
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• 제29호
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• pp.153-162
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• 2001

This study suggests the basic data required in setting up the standard for the architectural planning of Korean senior center by analyzing the standard and current situation of a senior center in Japan that has the welfare facility system similar to that of Korea and understanding its architectural characteristics. 1) Basic spaces that constitute the senior center in Japan are meeting room, lecture room, library, multipurpose meeting room, conference room, game-recreation room, kitchen, lounge, locker room and office. ADL, kitchen, relaxing room, private bathroom, and special bathroom are needed for adult day care as establishments as an annex and work room is also required for Job training. 2) The area of a senior center is calculated in consideration of its space organization that are required as basic. For the type "A", minimum area of 1,256.42 $m^2$2 and maximum area of 2,050.56$m^2$ and for the type "B", minimum area of 812000$m^2$ and maximum area of 1,604.14$m^2$ are suggested as optimum areas. 3) The circulation planning is presented by the connected between the space organization as well as the circulation system in day care center.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.375-378
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• 2007

In these days, Korea Railway apply simple catenary system to general lines and high speed lines of Korea Electric Railway. Circulation Current in catenary system frequently bring undesirable consequences. Namely, the Connector wire has many problems according to a flow of excessive circulation (or traction current) and a sudden rise of temperature on catenary when electric car or locomotive is running in high speed. The occurrence of events by the load increasement do considerable damages to peoples, organizations and systems. On a case by case accidents, the reeltype protective cover as part of various methods has some problems. In this project, we proposed the improved changes on the catenary system of a improvement and change of a messenger wire protector, improvement of connector wire's institution angle and of a replacement the connector wire with a dropper. Its tridimensional space limitation dictated the scale of the $32{\times}{\Phi}55$ to be as small as possible. It is easier to install than work by the existing cover on the messenger wire.

• 대한건축학회논문집:계획계
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• 제36권3호
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• pp.39-47
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• 2020

This study is preliminary and qualitative research to find out the possibility of using children's architectural work as projective test tools. The features of 21 works from the activity of built-environment education for children was analyzed and compared with MBTI psychological preference types. The key results are as follows: 1) Observation and communication was required to understand and analyze children's architectural works. 2) The results of children's work appeared in various ways, and were classified as indicators according to composition, shape, expression, program, circulation. These indicators also showed the independence of personal expression types regardless of age or gender. 3) The comparison between architectural expressions and MBTI preference types revealed a significant relationship between the indicators. The relationship only appeared in certain indicator pairs. Therefore, it can be said that the built-environment education could be used as a projection test tool to understand the psychological preferences of children. In conclusion, the meanings and limitations of this study and the possibility of future researches were discussed.

• 문화기술의 융합
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• 제9권5호
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• pp.291-298
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• 2023

본 연구의 목적은 김환기 작품 '우주'에 사용된 청색의 상징을 분석하고 고찰하여 추상미술을 깊고 풍부하게 감상하는 것에 있다. 연구 목적을 실현하기 위한 연구 문제는 다음과 같다. 첫째 김환기 작품 '우주'는 어떤 의미와 상징을 담고 있는가이며 둘째 우주를 품은 '청색'은 어떤 의미와 상징을 담고 있는가이다. 본 연구의 방법은 문헌연구를 통한 그림분석이다. 본 연구의 결과 김환기 작품 '우주'는 우주에 대한 내향적이며 수행적 표현으로 끊임없는 움직임, 순환, 반복을 보여주는 우주심을 담고 있었고 우주를 품은 '청색'의 주된 상징은 천상과 지하세계를 반복적으로 순환하는 푸른 소우주로서 작가의 환희와 절망을 한몸에 담고 하나의 전체를 향하는 내면을 담고 있었다.

• 한국근적외분광분석학회:학술대회논문집
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• 한국근적외분광분석학회 2001년도 NIR-2001
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• pp.3104-3104
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• 2001

The research described here was undertaken with the aim of monitoring, optimizing and ultimately controlling the production of heterofermentative microbes used as starters in the salami industry. The use of starter cultures in the fermented meats industry is a well-established technique used to shorten and standardize the ripening process, and to improve and control the organoleptic quality of the final product. Starter cultures are obtained by the submerged cultivation of suitable microorganisms in stirred, and sometimes aerated, fermenters where monitoring of key physiological parameters such as the concentration of biomass, substrates and metabolites suffers from the general lack of real-time measurement techniques applicable to aseptic processes. In this respect, the results of the present work are relevant to all submerged fermentation processes. Previous work on the application of on-line NIR spectroscopy to the lactic acid fermentation (Dosi et al. - Monreal NIR1995) had successfully used a system based on a measuring cell included in a circulation loop external to the fermenter. The fluid handling and sterility problems inherent in an external circulation system prompted us to explore the use of an in-line system where the NIR probe is immersed in the culture and is thus exposed to the hydrodynamic conditions of the stirred and aerated fluid. Aeration was expected to be a potential source of problems in view of the possible interference of air bubbles with the measurement device. The experimental set-up was based on an in-situ sterilizable NIR probe connected to the instrument by means of an optical fiber bundle. Preliminary work was carried out to identify and control potential interferences with the measurement, in particular the varying hydrodynamic conditions prevailing at the probe tip. We were successful in defining the operating conditions of the fermenter and the geometrical parameters of the probe (flow path, positioning, etc.) were the NIR readings were reliable and reproducible. The system thus defined was then used to construct and validate calibration curves for tile concentration of biomass, carbon source and major metabolites of two different microorganisms used as salami starters. Real-time measurement of such parameters coupled with the direct interfacing of the NIR instrument with the PC-based measurement and control system of the fermenter enabled the development of automated strategies for the interactive optimization of the starter production process.

• 한국항해항만학회지
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• 제30권1호
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• pp.97-104
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• 2006

최근 부산 신항만의 1단계 개발이 북 컨테이너 터미널쪽으로 가시적으로 나타나고, 12,000TEU 대형 컨테이너선을 서비스할 수 있도록 접근 수로 및 박지의 수심을 기존 15m 에서 18m로 준설작업을 통해 증심시킴과 아울러, 신항만의 웅동만 내 일부 수역을 매립하는 것으로 항만배후지 부분의 매립계획에 대한 수정이 논의되고 있다. 더구나 2003년 태풍 매미의 내습 이후 이곳 해역에서 항만구조물 설계의 기준이 되는 입사 파랑의 변화로 인해 각 부두에서의 극한파랑조건 및 항만 내 정온도에도 다소의 변화가 발생할 것으로 예상되어 각 부두에서의 정온도 분석이 뒤따라야 한다. 따라서 본 연구에서는 이들 변화에 대한 수치모델을 구성하고 실험을 수행한 후 현장 계측 자료와 함께 실험결과를 비교하였으며, 아울러 유동장에 대해서도 검토하였다. 결과, 전반적으로 항만의 반응이 증가되는 편이나 우려할 수준에 이르지는 않았지만 일부 구간에서는 태풍내습 시 대비하여야 하는 경우도 발생하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2005년도 추계학술대회 논문집
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• pp.117-124
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• 2005

최근 부산 신항만의 1단계 개발이 북 컨테이너 터미널쪽으로 가시적으로 나타나고, 12,000TEU 대형 컨테이너선을 서비스할 수 있도록 접근 수로 및 박지의 수심을 기존 15m 에서 18m로 준설작업을 통해 증심시킴과 아울러, 신항만의 웅동만 내 일부 수역을 매립하는 것으로 항만배후지 부분의 매립계획에 대한 수정이 논의되고 있다. 더구나 2003년 태풍 매미의 내습 이후 이곳 해역에서 항만구조물 설계의 기준이 되는 입사 파랑의 변화로 인해 각 부두에서의 극한파랑조건 및 항만 내 정온도에도 다소의 변화가 발생할 것으로 예상되어 각 부두에서의 정온도 분석이 뒤따라야 한다. 따라서 본 연구에서는 이들 변화에 대한 수치모델을 구성하고 실험을 수행한 후 현장 계측 자료와 함께 실험결과를 비교 하였으며, 아울러 유동장에 대해서도 검토하였다. 결과, 전반적으로 항만의 반응이 증가되는 편이나 우려할 수준에 이르지는 않았지만 일부 구간에서는 태풍내습 시 대비하여야 하는 경우도 발생하였다.

• 한국철도학회논문집
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• 제12권4호
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• pp.526-534
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• 2009

소형궤도차량(PRT)은 무인자동운전으로 중간역 정차 없이 궤도를 따라 운영되는 시스템이다. PRT는 교통체계내에서 철도역, 공항, 업무복합지구, 관광위락시설 및 쇼핑시설 등에서 교통상황에 따라 수요에 부응하는 지선교통체계로서의 역할에 적절하다. 이러한 PRT시스템은 대규모 교통시설간, 지선교통체계와 간선교통체계간, 중심업무지구내 일정 범위 안에서 또는 위락시설간 통행자들을 위한 교통수단으로 적절히 활용될 것으로 전망된다. 본 논문은 신교통시스템으로서 대중교통수단의 다변화에 기여할 수 있는 PRT시스템의 특성을 고려하여 PRT시스템 의 적정 지역 선정을 위한 정책적 검토 사항을 모색하였으며, 지속적인 기술의 발전을 통해 PRT가 대중교통시스템내에서 신뢰성과 효율성을 확보할 것으로 기대한다.