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논토양에 3요소비료 시용시 이들 비료성분의 토양내 잔존 형태와 용탈에 의한 수질오염에 관한 연구
이창호,임수길 ( Chang Ho Lee,Soo Kil Lim ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.4
In order to investigate the behavior of N,P,K fertilizers applied in submerged paddy soils and the water pollution caused by these leachate, Ammonium sulfate(AS), Urea, Superphosphate(SP), Fused phosphate(FP), Potassium chloride(PC) were applied in three levels in the columns filled with silty clay loam(SiCL) and sandy loam(SL), respectively. Distributions of N,P,K in soil were detertmined, and concentrations of N,P,K in leachate were also analyzed, separately. The obtained results were summarized as follows. In terms of residual amounts in soils, AS induced decreasing amount NH₄-N from top to bottom whereas Urea revealed reverse phenomenon. SL soil rather than SiCL soil and AS rather than Urea had a much effect on the water pollution. Residual amount of NO₃-N showed higher amount in SL soil than in SiCL soil regardless of fertilizer and application rates. In SiCL soil, main source of soluble phosphorus was SP whereas FP was the one in SL soil. Conc. of phosphorus in leachate were very small due to high adsorption ability of soils for phosphorus, the soil pollution was more considered than the water pollution. Leaching conc. of K^+ was higher from SL soil than SiCL soil, leaching conc. of K^+ increased as fertilizer application rates increasing on both SiCL and SL soils. Leaching concentrations(Y) of K^+ decreased with increasing leaching frequency(X), fitting the equation of exponential function could be expressed as Y=aX^b egardless of soil textures and potassium fertilizer application rates. The value of b is in between 0.41 and 0.63.
이창호,이승훈,박명진,권오민,Lee, Chang-Ho,Lee, Seung-Hoon,Park, Myeong-Jin,Kwon, Oh-Min The Korean Institute of Electrical Engineers 2017 전기학회논문지 Vol.66 No.1
This paper investigates improved stability and stabilization criteria for sampled-data control systems. By using a suitable and newly constructed augmented Lyapunov-Krasovskii functional and some recent mathematic techniques such as auxiliary function-based integral inequalities, sufficient conditions for stability and stabilization conditions are derived within the framework of linear matrix inequalities(LMI) form. The superiority and validity of the proposed results are illustrated by three numerical examples.
알칼리성 Prottease를 생산하는 Xanthomonas sp. YL-37의 분리 및 조효소의 성질
이창호,권태종,강상모,서현효,권기석,오희목,윤병대,Lee, Chang-Ho,Kwon, Tae-Jong,Kang, Sang-Mo,Suh, Hyun-Hyo,Kwon, Gi-Seok,Oh, Hee-Mock,Yoon, Byung-Dae 한국미생물 · 생명공학회 1994 한국미생물·생명공학회지 Vol.22 No.5
A bacterial strain, which showed the high protease activity at low temperature and the high tolerance for the surfactant, was isolated from soil and identified as Xanthomonas sp. YL-37. The optimal temperature, initial pH, and cultivation time for the production of the alkaline protease by Xanthomonas sp. YL-37 were 20$\circC , 11.0, and 84 hours, respectively. In the jar fermenter culture of Xanthomonas sp. YL-37, the alkaline protease activity was about 15,000 DU/ml/-broth after cultivating for 108 hours. The optimal pH and temperature for the protease activity were 70$\circC and 11.0, respectively. The protease was relatively stable at the pH range of 7.0~12.0 and at the temperatures below 50$\circC . The protease activity at 20$\circC was about the level of 40% of its activity at 70$\circC . The enzyme was suggested as a serine protease because the enzyme activity was inhibited by phenylmethane sulfonyl fluoride, a serine modifier.
웹 서비스 애플리케이션의 동적 성장을 위한 ESB와 에이전트 기반 프레임워크
이창호,김진한,이재정,이병정,Lee, Chang-Ho,Kim, Jin-Han,Lee, Jae-Jeong,Lee, Byung-Jeong 한국정보처리학회 2007 정보처리학회논문지 A Vol.14 No.7
유비쿼터스 컴퓨팅 환경에서는 이기종 플랫폼간의 상호작용과 빠른 환경의 변화에 대처할 수 있는 능력이 필요하다. 웹 서비스는 이러한 문제를 위해 이종의 분산 서비스 또는 자원들을 활용하고 조직하기 위한 방법을 제공한다. 그렇지만 서비스 요청 시, 의미 정보의 부족으로 원하는 서비스를 찾기가 어렵다. 시맨틱 웹 서비스는 의미 정보는 제공하지만 다양한 매칭에 대한 방법은 지원하지 않고 있다. 또한 웹 서비스를 이용해서 소프트웨어에 적응과 확장 능력을 제공할 순 있지만, 서비스들을 관리하고 운영하는 방법이 필요하다. 따라서 본 논문에서는 웹 서비스 애플리케이션의 동적 성장을 위해 ESB(Enterprise Service Bus)와 에이전트 기반의 프레임워크를 제안하고 유용성을 보이기 위한 프로토타입을 제시한다. Software adaptation may be required to interact between heterogeneous platforms and to react to rapid change of environment in ubiquitous computing. Web service provides a way to use heterogeneous and distributed services or resources to utilize and organize them. But it is not easy to retrieve appropriate services when we search services because web service lacks of semantic information. Semantic web service provides additional information of services, but it does not support a method to match them in various ways. We can adapt and extend web applications by using web service, but a method for management and administration is still needed. Therefore in this paper, we propose a framework for dynamic growing of web service applications based on ESB(Enterprise Service Bus) and agent and provide a prototype to show its usefulness.
Representation of Interactions in Data Model for Hybrid Structural Experiments
이창호,Lee, Chang-Ho Computational Structural Engineering Institute of 2010 한국전산구조공학회논문집 Vol.23 No.2
하이브리드 구조실험에서는 전체구조물을 여러 개의 부분구조물로 나누어서 실험과 해석을 수행한다. 실험을 위한 부분 구조물들과 해석을 위한 부분구조물들은 지역적으로 서로 다른 장소에서 실험과 해석이 수행될 수 있으며, 이 부분구조물들의 실험과 해석은 시뮬레이션 코디네이터에 의하여 통제된다. 하이브리드 구조실험을 수행하는 동안에 시뮬레이션 코디네이터와 부분구조물들은 서로 간에 데이터 교환이 이루어지는 상호작용을 하게 된다. 본 논문은 이러한 상호작용을 기술하고 있는데, 하나의 하이브리드 구조실험 예제에 대하여 시뮬레이션 코디네이터와 부분구조물들 사이의 상호작용을 데이터 모델의 하나인 리하이 모델의 클래스와 객체를 통하여 표현하였다. 시뮬레이션 코디네이터와 부분구조물들은 각자의 데이터 저장을 위한 객체를 가지도록 구성하였고, 서로간의 연결은 동일한 형식의 인터페이스 링크를 사용하여 처리하였다. 본 논문에서 설명한 객체들은 일관된 방법에 의하여 구현하였는데, 하이브리드 구조실험을 위한 컴퓨터 시스템의 개발에 사용할 수 있다. The hybrid structural experiment decomposes a structure into independent substructures that can be tested or simulated. The substructures being tested or simulated may be distributed at different facilities of different locations, and are managed by the simulation coordinator. There exist interactions among the simulation coordinator and the substructures since they give and receive the commands and feedbacks during the experimental process. These interactions are described in this paper for an example hybrid structural experiment using the classes and objects in the Lehigh Model which is one of the data models for structural experiments. The simulation coordinator and the substructures have the objects for the interaction data files, and are linked together through the same types of the interface links. The objects for the interactions presented in this paper can be implemented in a consistent way, and be used for developing the computer system for the hybrid structural experiments.