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강창식(Chang-Sik Kang),한상진(Sang-Jin Han),정진명(Jin-Myung Jung),이태현(Tae-Hyun Lee),구용완(Young-Wan Koo) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.1A
이동 컴퓨팅에서는 이동중인 호스트가 원활한 통신을 유지하도록 하는 위치 투명성을 제공하는 것이 중요하다. 본 논문은 위치 투명성, 위치 관리 및 다른 이동 호스트와 통신을 하기 위해 필요한 위치 관리 전략을 다루고 있으며, 이동 호스트(mobile host)를 이용하는 컴퓨터 네트워크 상에서 이동 호스트의 위치가 변경될 때, 이 위치를 관리하도록 하는 경로(routing) 기법에 관한 것이다. 기존의 대표적인 라우팅 기법에는 삼각 라우팅, 강화된 삼각 라우팅 및 정책 갱신 전략 등이 있는데, 본 논문에서는 이들 라우팅 전략 중에서 강화된 삼각 라우팅의 탐색 비용을 줄일 수 있는 방법을 제안하고 있다. 제안한 확장된 삼각 라우팅 기법은 이동 호스트의 위치 변경 시에 탐색 시간을 줄일 수 있으며, 원활한 통신을 할 수 있게 한다.
부산도시철도 1호선 전동차 ATC/ATO System 개량 연구
강창식(Chang-Sik Kang),박희철(Hee-Chul Park),김봉택(Bong-Teak Kim),김효상(Hyo-Sang Kim) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
On-Board Signaling equipment for the rail car is similar as a nerve network of human body which needs high reliability and stability. Busan metro line 1 was opened to the public on July 1985 and it is providing reliable and stable large-scale transportation for the Busan citizens up to the present. But, for 24 years of long operation, equipments are being obsolete and it is now facing several problems on maintaining and repairing the product because spare parts of the equipments are no longer manufactured. Specially, ATC/ATO train signaling equipments of Busan metro line 1 needs to have continuous support and functional upgrade because of relatively long runtime and unstable running environment which is different from ground signaling equipment. In this paper we have improved the difficulties of analysing and preventing recurrence of malfunction on the ordinary train signaling equipment which is unable to save and view the processing information data because limitations of circuit organization and usage of supplier's hardware & software. Specially our proposed platform is compatible with ordinary imported product in installation method and functional structure. Also it can be connected with ground signaling equipment of Busan metro line 1. In this research, we have studied overall improvement by means of "Function extend-type digital ATC/ATO train signaling equipment for Busan metro line 1" which has possibility of changing driving method according to the train stopping on regular position algorithm
강창식(Chang Sik Kang),신유환(You Hwan Shin),김광호(Kwang Ho Kim) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
Experimental study was conducted to reveal the instability such as leakage flow and rotating stall in an axial flow fan. For this study, unsteady total pressure probe and multi-hole pressure probe were specially designed for measuring the flow field upstream and downstream of rotor. The measured pressure signal was analyzed by Single and Double Phase Locked Averaging Technique. From the result of total pressure fields at inlet and outlet of the rotor, the useful information on the structure of the stall cell in radial direction was provided. Also, detailed flow measurements were carried out with a specially designed high frequency multi-hole pressure probe, providing some insight to the leakage flow and their interation.
김장규,강창식,임사준,이은종,이경휘,Kim Chang Kyu,Kang Chang Sik,Rim Sa Joon,Lee Eun Jong,Lee Kyung Hee Korean Society of Applied Entomology 1981 한국식물보호학회지 Vol.20 No.2
1976연, 1977년 및 1980연의 3개년간 진흥과 유신을 공시, 질소질보비구와 배비구로 나누어 6월 21일부터 9월 21일까지 생유 및 잎집무늬마름병의 발병조사를 실시한 결과, 1, 생육상황에 있어서는 진흥이 유신보다 초장이 길었으며 8월 1일 이후에는 질소시비수준에 관계없이 $18\~22cm$ 길었다. 그러나 분얼수에 있어서는 유신에서 많았다. 2. 초발은 6월하순 또는 7월상순으로 7월중순$\~$8월상순사이에 발병주율과 경율이 급속히 증가하였다. 3. 초장에 대한 병반높이의 백분율을 나타낸 병반고율에 있어서는 9월초순에 $50\%$ 내외였으며 유신배비구에서는 8월 11일이후에 $50\%$를 넘었다. 4.조사주에서 제일 높이에 병반이 위치한 엽립 또는 엽초위를 조사하여 병반지수로 나타낸 결과 성숙기에 가까운 9월 21일 조사에서 진흥배비구는 차엽의 중간, 유신배비구는 상엽의 엽초에까지 도달되어 있었다. 5. 상위 제1절부터 제5절까지의 절간장을 비교한 결과, 제 3,4,5절의 길이는 두 품종간에 별차이가 없었으나 제1절과 제2절에서는 진흥이 각각 $7\~6cm$ 길었다. 결론적으로 병반고율에 있어서는 같은 질소시비수준내에서 유신이 진흥보다 높았으며 같은 높이에서 발병이 시작되고 병반진전속도가 같아도 상위 제1, 제2절간장의 길이가 짧은 유신에서 피해가 많았다. The percentage of lesion height vs. plant height was higher in Yushin than Jinheung within the same nitrogen level. The infection occurred at the same level of waterline and the symptoms developed with the same speed for two varieties, but the damage was greater in Yushin as the symptoms reached faster to the top due to the short length of the 1st and 2nd internodes from the top.
유찬주(Chan-Ju Yu),강창식(Chang-Sik Kang),장동헌(Dong-Heon Jang) 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.3
This study analyzed tourists’ intention at Gangcheon Mountain, Sunchang-gun for local tourism. The contents of study included impression, characteristics, specialized resources, development direction, intention of visit and its form, destination prior and post visit, travelling expenses, and development form of tourism. The results were as following. Impression and characteristics showed that gochujang and fermentation industry established a strategic ground of local development. Intention of revisit of tourists was relatively high by 97.1%. Furthermore, tourists were mainly family units and they preferred family-based recreational type for the future local tourism development form. Therefore, a development strategy will be required that involves inexpensive accommodation, unique local food items, agricultural-specialty products and local tour packages. For invigoration of local tourism, recruitment of skilled managers for farm village experience will be necessary as well.
유찬주(Chan-Ju Yu),강창식(Chang-Sik Kang),장동헌(Dong-Heon Jang) 충남대학교 농업과학연구소 2013 Korean Journal of Agricultural Science Vol.40 No.3
This study analyzed tourists’ intention at Gangcheon Mountain, Sunchang-gun for local tourism. The contents of study included impression, characteristics, specialized resources, development direction, intention of visit and its form, destination prior and post visit, travelling expenses, and development form of tourism. The results were as following. Impression and characteristics showed that gochujang and fermentation industry established a strategic ground of local development. Intention of revisit of tourists was relatively high by 97.1%. Furthermore, tourists were mainly family units and they preferred family-based recreational type for the future local tourism development form. Therefore, a development strategy will be required that involves inexpensive accommodation, unique local food items, agricultural-specialty products and local tour packages. For invigoration of local tourism, recruitment of skilled managers for farm village experience will be necessary as well.
이두열(Du-Yeol Lee),강창식(Chang-Sik Kang),신유환(You-Hwan Shin),김광호(Kwang-Ho Kim) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
In this study, the instability of a centrifugal compressor with vaned diffuser was investigated. During unstable operation of the test compressor, pressure fluctuations at different diffuser radius ratios were measured by using high frequency pressure transducers. Two different types of stall, mild and deep stall, were observed alternately and irregularly at some flow rate where the compressor performance was steeply deteriorated. In this transient zone, the size of rotating stall cell was estimated through the Wavelet transform analysis. It was about 45 percents of rotor circumferential space at 3000 rpm and not dependent on flow rate.