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김창수,유재원,박미라,이창근,홍재상,Kim Chang-Soo,Yoo Jae-Won,Park Mi-Ra,Lee Chang-Gun,Hong Jae-Sang 한국수산과학회 2006 한국수산과학회지 Vol.39 No.2(특별호)
We examined the effect of predation by observing the changes in macrobenthic communities in a tidal flat at Seonjae, Korea, following the exclusion of large predators such as birds, fishes and crustaceans using protective screens. We conducted two interference experiments in the field from April to November 2004: (1) Experiment 1 was conducted at a mid-tidal flat in the western part of Seonjae-do, Incheon, Korea, (2) Experiment 2 was set up at a low tidal flat in the eastern part of Seonjae-do. predator exclusion showed different effects in the two experiments. Both the number of species and density were reduced by 20% in Experiment 1. Whereas in Experiment 2, they increased by up to 13% and 69%, respectively. In Experiment 1, a high density of brachyuran crabs observed in the treatment may have caused the difference in community composition between the treatment and the control, and this probably resulted from active predation of macrofauna (e.g., small crabs) under protection from megafaunal predators such as birds and fishes. However, in Experiment 2, as typically observed in other predator exclusion experiments, a lower density of benthic predators and the subsequent reduction of over predation probably resulted in a more diverse and abundant benthic community in the treatment. We confirmed that predation was a contributing factor in the formation of the macrobenthic community. We also demonstrated relationships that exist among different trophic groups (large predators, macrobenthic predators and prey) and what effects and responses occur in each component of the tidal flats.
국립공원 관리를 위한 해양생태계 장기 모니터링 프로그램의 발전 방향
이채린(Chae-Lin Lee),유재원(Jae-Won Yoo),정병관(Byungkwan Jeoung),김창수(Chang-Soo Kim),안동식(Dong-Sik Ahn),김성태(Sungtae Kim),성은주(Eun-Ju Sung),김성현(Sung-Hyun Kim),정수영(Su-Yeoung Jeong),박영석(Young-Seuk Park) 국립공원연구원 2021 국립공원연구지 Vol.12 No.2
생태계 변화의 모니터링은 효율적 생태계 관리를 위한 기초 정보 수집을 위해 중요한 과정이다. 많은 생태 현상과 그 과정은 오랜 시간에 걸쳐 진행되므로 국립공원의 지속적인 보전 및 효율적 관리를 위해 생태계 모니터링은 장기적으로 이루어질 필요가 있다. 본 연구는 국내외 장기 모니터링 프로그램 사례 분석을 통해 성공적인 장기 모니터링을 위한 방법으로써, 최적화된 모니터링 설계, 표준화된 운용방안 마련, 인적 자원 및 DATA 관리 체계 수립, 안정적인 재정 마련 및 후속지원 등을 제시하였다. 이를 바탕으로, 현재 10년 넘게 수행되고 있는 ‘HS호 유류유출 사고 해역 장기 모니터링 프로그램’의 발전 방향으로 적응형 모니터링 방식이 적용된 표준화된 프로토콜의 정립, QA/QC와 지속적인 자료 관리, 조사 항목의 연계성 강화 등의 구체적 방안을 제안한다. Monitoring ecosystem changes is an important process for collecting basic information for ecosystem management. Since many ecological phenomena and their processes take place over a long period of time, it is necessary to conduct long-term monitoring of ecosystems for the continuous conservation and efficient management of national parks. This study suggested an optimized monitoring design, standardized operation plan, human resource and data management system, stable financial preparation and follow-up support as methods for successful long-term monitoring through case analysis of domestic and foreign long-term monitoring programs. Based on this, it proposes specific measures such as establishing a standardized protocol with adaptive monitoring methods, continuous data management with QA/QC, and strengthening the linkage of investigation items in the development direction of the “HS oil spill accident long-term monitoring program” that has been conducted for more than a decade.
800MPa 강재 및 100MPa 콘크리트를 적용한 매입형 합성기둥의 구조성능
김창수,박홍근,최인락,정경수,김진호,Kim, Chang-Soo,Park, Hong-Gun,Choi, In-Rak,Chung, Kyung-Soo,Kim, Jin-Ho 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.5
고강도강재 및 고강도콘크리트를 적용한 매입형 합성기둥의 편심압축시 거동특성을 연구하기 위하여, 항복강도 $f_{ys}$=913MPa 강재와 압축강도 $f_{ck}$97.7MPa 콘크리트를 사용하여 실험연구를 실시하였다. 주요변수는 횡철근의 종류, 항복강도, 배근간격, 그리고 편심하중거리이다. 거동특성을 분석하기 위하여 구속효과와 변형률적합조건을 적용한 비선형 단면해석을 실시하였으며, 현행 설계기준들의 적용성을 판단하기 위해 실험결과와 비교하였다. 횡구속효과에 의하여 콘크리트의 연성능력은 증가하였으며, 이에 따라 단면의 휨모멘트강도가 증가하였다. 비선형해석을 통해 합성단면의 축력-모멘트 상관관계를 예측한 결과는 실험결과와 잘 일치한 반면, 강재의 완전소성강도를 사용하는 Eurocode 4는 실험체의 성능을 과대평가하였으며, 콘크리트의 횡구속효과를 고려하지 않은 ACI 318은 과소평가하였다. Five concrete-encased steel columns using high-strength steel($f_{ys}$=801MPa) and high-strength concrete($f_{ck}$=97.7MPa) were tested to investigate the eccentric axial load-displacement relationship. Test parameters included the type, yield strength, and spacing of lateral reinforcement, and also the eccentricity of axial load. To analyze the behavior of the column specimens, the nonlinear sectional analysis using strain-compatibility and confinement effect was performed. To examine the applicability of existing design codes for the composite sections using high-strength materials, the test results were also compared with the predictions by the nonlinear analysis and the design codes. The confinement effect of lateral reinforcement increased the ductility of concrete, and the moment capacity of the column specimens increased with the ductility of concrete. The prediction by the nonlinear analysis gave good agreement with the test results. On the other hand, the ACI 318 neglecting lateral confinement effect underestimated the strength of the column specimens, and the Eurocode 4 using complete plastic capacity of steel section overestimated.
증기발생기 전열관 곡관부 덴트와 원주방향 외경노치가 혼합된 와전류신호 특성분석
김창수(Chang-Soo Kim),박병호(Byong-Ho Park) 한국비파괴검사학회 2020 한국비파괴검사학회지 Vol.40 No.3
증기발생기에서 곡률반경이 작은 U-bend 전열관을 제작하기 위한 굽힘 공정에서 덴트와 유사한 기하학적 형상변화를 유발하게 되며, 곡률반경이 상대적으로 큰 전열관 보다 굽힘 응력이 크게 발생한다. 전열관에 생성된 기하학적 형상변화는 가동 중에 응력이 집중되는 요인으로 작용하여 응력부식균열이 발생되기 쉬운 환경이 되며, 기하학적 형상변화의 영향으로 결함의 와전류신호 중간 부위가 꺾인 형태로 나타나게 된다. 본 연구에서는 이러한 특성을 분석하기 위하여 증기발생기 전열관의 1∼3열의 곡관부에 덴트와 원주방향 외경노치를 가공하여 생성되는 와전류신호의 특성을 분석하였다. Bending process of the steam generator U-bend tubes with small radius of curvature results in geometric changes similar to a dent. Such a tube generates a greater bending stress than a tube with a large radius of curvature. The change in geometric shape generated in the tube acts as a factor in which stress is concentrated during operation, marking it an environment where stress corrosion cracking is likely to occur, and the eddy current signal of defect is distorted due to the geometric shape change, marking detection difficult. In order to understand these characteristics, the dent and circumferential external diameter notches were machined in the tube of 1 to 3 rows, and the characteristics of the eddy current signal were analyzed.
박구곤(Park, Gu-Gon),임남윤(Lim, Nam-Yun),손영준(Sohn, Young-Jun),박진수(Park, Jin-Soo),이원용(Lee, Won-Yong),김세훈(Kim, Sae-Hoon),임태원(Lim, Tae-Won),김창수(Kim, Chang-Soo) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Water management in polymer electrolyte membrane fuel cells(PEMFCs) is one of the most challenging issues. Freeze start-up in the automotive applications is also important research topic in the PEMFC field. Transportation of proton and separation of reactant gases are main roles of polymer electrolyte membranes. It has been known that water in the membrane conducts as a vehicle for the proton transportation. At sub-zero temperature, the frozen water blocks the access of reactant gases to the active sites of electrode as well as occurs the physical destruction of fuel cell structures. In this study, property changes of electrolyte membranes in the freeze conditions (at;-25?C) were investigated. For the various amount of water contained membranes, the property changes, especially for the proton conductivity, were observed after several times of freeze/thaw(-25~80?C) cycle.
박진수(Park, Jin-Soo),백지숙(Baek, Ji-Suk),양태현(Yang, Tae-Hyun),김창수(Kim, Chang-Soo),임성대(Yim, Sung-Dae),박구곤(Park, Gu-Gon) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
This study presents preparation and characterization of composite membranes based on ionic liquids. The ionic liquids act as water in sulfonated membranes. On the behalf of ionic conduction through ionic liquid inside the membranes, non-aqueous membranes showed Arrenhius dependence on temperature with no external humidification. It was implied that hopping mechanism of proton was dominant in the ionic liquid based membranes. In addition, small angle X-ray (SAXS) studies provided the information on morphology of ionic clusters formed by the interaction between sulfonic acid groups of the polymers and ionic liquids. The SAXS spectra showed matrix peaks, ionomer peaks and Prodo's law for Nafion based composite membranes and only matrix peaks for hydrocarbon based ones. However, ionic conductivity and atomic force microscopy (AFM) images showed the clear formation of ionic clusters of the hydrocarbon based composite membranes. It implies for ionic liquid based high temperature membranes that it is important to use sulfonated polymers as solid matrix of ionic liquid which can form clear ionic clusters in SAXS spectra.
동결/해동 조건에서 기체확산층의 물성이 고분자전해질연료전지의 내구성에 미치는 영향
박구곤(Park, Gu-Gon),임수진(Lim, Soo-Jin),박진수(Park, Jin-Soo),손영준(Sohn, Young-Jun),임성대(Yim, Sung-Dae),김창수(Kim, Chang-Soo),양태현(Yang, Tae-Hyun) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
The effect of the kind of gas diffusion layers (GDLs) on the freeze/thaw condition durability in polymer electrolyte fuel cells (PEFCs) were investigated. For this purpose, three kinds of GDLs, i.e., felt, paper and cloth types with different basic properties have been first prepared, then the changes in the properties and performance of cells was observed during the freeze/thaw cycles ranging from -30 to 70 ?C. The single cells consisting of different GDLs were evaluated for performance. The performance degradation and the cell resistance increase could be directly correlated. The physical destruction of electrode was shown by SEM analysis. It was presented that mechanical supporting force of interface between materials can help enhancing the durability of PEFCs in the freeze/thaw condition.