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하니콤 샌드위치 구조물의 수리 시 반복 경화에 따른 강도 특성 평가
손영준(Y-J Son),이기현(K-E Lee),김국진(K-J Kim),한중원(J-W Han),김윤해(Y-H Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
Aerospace industries are widely using honeycomb sandwich structures that it has high specific strength and stiffness, chemical material resistance and fatigue resistance. But, in repairing process of damaged areas, one of the problems is that delamination can be occurred in the sound areas during and/or after the exposure to the elevated curing temperature in case that the repair process is repeated. Therefore, this study was conducted Flatwise tensile, Drum peel and Long beam flexural strength tests to evaluate the degree of degradation of mechanical properties of the honeycomb sandwich structures by affecting thermal aging. As the results, the decrease of mechanical strength was observed at the specific specimen which is exposed over 50hrs at 127℃.
전기분해장치를 이용한 선박평형수관리장치의 배출수에 대한 해양생태독성 및 해양환경위해성에 관한 연구
손명백(M.-B. Shon),손민호(M.H. Son),이지현(J. Lee),손영준(Y.-J. Son),문창호(C.H. Moon),임수연(S.-Y. Im),김영수(Y.-S. Kim) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회 학술대회논문집 Vol.2012 No.11
전기분해장치를 사용하여 선박의 평형수를 처리하는 AquaStar™ BWMS가 개발되었고, 이로부터 방류되는 배출수가 해양생태계에 미치는 영향을 파악하기 위하여 Skeletonema costatum, Brachionus plicatilis 및 Paralichtys olivaceus를 이용하여 배출수독성시험과 생성된 화학물질에 대한 환경위해성 평가를 수행하였다. 배출수독성시험결과 가장 민감한 생물은 S. costatum이었고 20 psu 배출수에 노출되었을 때 NOEC 25.00%, LOEC 50.00% 및 72hr-EC??이 69.97%였다. AquaStar™ BWMS에서 생성된 물질은 총 18개로, bromate, 7개의 volatile halogenated organic compounds, 7개의 halogenated acetic acids, 3개의 halogenated acetonitriles 및 chloropicrin이었다. 그러나 MAMPEC을 이용하여 생성된 18개 물질의 PEC 산출결과는 4.58E-04~4.87E+00 ㎍ L?¹였고, PNEC는 0.016~320.00 ㎍ L?¹였다. 18개 화확물질의 PEC/PNEC 비율은 1을 초과하지 않았고, PBT 특성을 보이지 않았다. 따라서 환경위해성평가결과는 AquaStar™ BWMS에 의하여 처리된 해수가 해양생태계에 수용 불가한 영향을 미치지 않을 것임을 시사하였다. In this study, WET (whole effluent toxicity) test with Skeletonema costatum, Brachionus plicatilis and Paralichthys olivaceus, chemical analysis and ERA (environmental risk assessment) were conducted to assess the unacceptable effect on marine ecosystem by emitting the discharge water treated with AquaStar™ BWMS (ballast water management system) using electrolyzer as main treatment equipment. The most sensitive test organism on discharge water treated with AquaStar™ BWMS was S. costatum that gave the NOEC value of 25.00%, LOEC value of 50.00% and 72hr-EC?? value of 69.97% from WET test result for 20 psu treated discharge water. In the chemical analysis results, total number of substances produced by AquaStar™ BWMS was 18 which were bromate, 7 volatile halogenated organic compounds, 7 halogenated acetic acids, 3 halogenated acetonitriles and chloropicrin. Eighteen substances did not consider as persistence and bioaccumulative chemicals. Uncertainty of toxic property of 18 substances was high. However, the PEC/PNEC ratio of 18 substances did not exceed 1. Therefore, ERA for produced substances indicate that the discharge water treated with AquaStar™ BWMS does not pose unacceptable effect on marine life.