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위성자료와 경험직교함수를 이용한 제주도 주변해역의 중국대륙연안수 영향 연구
윤홍주 ( Hong Joo Yoon ),조한근 ( Han Keun Cho ),안유환 ( Yu Hwan Ahn ) 大韓遠隔探査學會 2005 大韓遠隔探査學會誌 Vol.21 No.6
중국 대륙연안수(CCW;China Coastal Waters)는 해에 따라 다소 다르지만 보통 하계인 6월~10월 사이에 제주도 주변해역에서 두드러지게 나타난다. 즉 6월에 나타나기 시작하여 8월에 가장 큰 영향을 미치며 10월로 접어들면서 그 세력이 점차 소멸해간다. 해수면편차와 해수면온도의 경험직교함수 분석 결과 해수면편차는 1~3모드가 총 분산의 95.05%를 차지하였고, 해수면온도는 1모드가 총 분산의 98.70%를 차지하였다. 해수면편차 경험직교함수분석의 첫 번째 결과에 대한 파워스펙트럼분석에서는 중국대륙연안수에 의한 영향으로 동쪽해역보다 서쪽해역이 43일 주기의 세력이 더 강하게 나타났다. 해수면온도에 대해서는 양자강 하구를 비롯한 제주도 동쪽·서쪽해역의 주기가 모두 260일 주기가 나타남으로서 중국대륙연안수는 43일, 120일 등의 짧은 주기 보다는 비교적 장주기라 할 수 있는 260일 주기에 더 큰 영향을 미쳤다. China Coastal Waters (CCW) usually appears in the seas surrounding Jeju Island annually(June to October) and is very pronounced in August. Generally, low-salinity water appears to the western seas of Jeju Island from June through October and gradually propagates to the eastern seas, where CCW meets the Tsushima Current. Empirical orthogonal function (EOF) analysis of SLAs and SSTs indicated that the variance in SLAs and SSTs was 95.05%(the first mode to third mode) and 98.09%(the first mode), respectively. The PSD of the western waters for the first mode of EOF analysis of SLAs was stronger than that of the eastern waters because of the influence of CCW. The PSD for the EOF analysis of SSTs was similar in all areas (the Yangtze Estuary and the seas to the west and east of Jeju Island), with a period of approximately 260 days.
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김재명,최윤수,서창완,조한근,Kim, Jae-Myeong,Choi, Yun-Soo,Seo, Chang-Wan,Cho, Han-Keun 한국공간정보학회 2010 한국공간정보학회지 Vol.18 No.5
본 연구는 비도시지역 디지털 지리정보구축 추진을 위한 중장기 기본계획안에 대한 연구를 수행하여 도출된 제도적 기반 확립을 통해, 비도시지역을 중심으로 한 디지털 지리정보구축을 토대로 전국토가 세계화 개방화 정보화 시대에 대응할 수 있도록 기초자치단체의 정보화를 강화하고자 하는데 그 목적이 있다. 중장기 계획안은 1/1,000 수치지도와 영상지도, 수치표고모형을 동시에 제작함으로써 1단계에서 디지털 지리정보 구축 및 유지관리 조직 구성, 비도시지역 공간정보인프라 구축, 관련법규 정비 및 지역협의회 구성의 기반정보를 구축하고, 2단계에서는 디지털 지리정보 구축확산, 지리정보유통 활성화, 공간데이터웨어하우스 구축, 도시계획종합관리시스템 구축 및 3차원공간정보시스템 구축의 정보화 확산 및 3단계에서는 지리정보 현행화 및 유지관리, 부가가치정보 생산, 행정업무의 고도화 및 대민서비스 극대화를 통한 정보 고도화를 실현함으로써 시군구/시도/중앙정부의 통합지리정보의 기반이 되는 지리정보를 구축 방안을 제시하고자 한다. The construction of digital geographic information of Non-Urban Area have been needed to build a nationwide information infrastructure for the balanced development of nation to reduce a gap between city and Non-Urban Area due to the emphasis on a large scale digital map (1/1,000) implementation for cities. In this research, we researched the basic long-term blueprint for establishing digital geographic information in non-urban area. From the proposed institutional foundation, we want to build this information for Non-Urban Areas and to make a long-term plan to strengthen the national com petitiveness dealing with the globalization, liberalization, and information based on the digital geographic information in non-urban area. This study suggested 3 alternatives to implement digital geographic information of Non-Urban Area as follow. Firstly central government fund whole cost, secondly central government and local government fund a cost half and half, lastly combining first and second alternative. This study can be a basis on building national information infrastructure, provide core information for national projects and revitalize the use of spatial information for Non-Urban Area.
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최완규,조한근 충북대학교 농업과학기술연구소 2001 農業科學硏究 Vol.18 No.-
Surface crack detection is an important aspect in the quality control process of egg markets. The acoustic vibration of an egg could be used as a critical factor in evaluating the eggshell quality. The mode shape indicates the egg vibration behavior at different locations with respect to the input impulse and provides important information for the optimum sensor location to obtain the desired acoustic measurements. Theoretical analysis and experimental measurements were conducted to determine the acoustic vibration modes in eggs. The resonant frequencies of the first and second resonance mode of intact eggs were found to be distributed between 2kHz and 7kHz range. The measured mode shapes of an egg were similar to theoretical shapes of homogeneous, elastic spheres. An elliptical deformation at the equator ring of the egg was observed. The frequency peak of this mode was dominantly present in the frequency spectrum of an intact egg impacted at its sharp position. The mode shapes related to the first resonant frequency of an egg showed that the optimum location for the measuring sensor was the 180 degrees position. A optimum location for the egg support was found to be the 90 degrees position having the smallest vibration magnitude.
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송석진,조한근 忠北大學校 農業科學硏究所 2002 農業科學硏究 Vol.19 No.-
Chemical application is one of most important field operations in rice production. Rolling of a boom due to local unevenness and softness in fields causes a local under/over - application of spray This research was focused to develop a mathematical model for the boom sprayer based on active pendulum suspension control system The kinetic equation of the active pendulum suspension control system was expressed by Lagrange's equation The SIMULINK toolbox in the MATLAB software package was used for the simultaneous analysis The corresponding slope of boom with respect to ground was obtained by using a Runge - Kutta numerical integration algorithm By changing both rotational damping coefficient(msN/rad) of suspension with 400, 1000, and 2500, and the ground slope from 0 to 10 degree, it was observed that slope of the boom was controlled properly.
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