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이동길 ( Donggil Lee ),양용수 ( Yongsu Yang ),김병관 ( Pyungkwan Kim ),김성훈 ( Seonghun Kim ),김현영 ( Hyunyoung Kim ) 한국어업기술학회 2017 수산해양기술연구 Vol.53 No.2
The renewable energy sources can be thought of one of the major measures to reduce greenhouse gas emissions in the industries. However, the utilization technology for those sources is approaching in the different matters. One of them, thermoelectric generation might be applicable to fishing industry. A various of internal combustion engines are used in a wide range of fisheries. After the ignition process, the heat passed out from the exhaust outlet. Recycling the heat could be not only an energy source but also reduction of green gas emission. Therefore, this study was designed to verify the feasibility of generation from wasted exhaust gas and analyze the performance. The designed experiment devices were connected with a data logger and an electric loader to quantify the currency and voltage. The devices were installed in a coastal fishing vessel for a gillnet fishery. During the whole fishing trips, the amount of generation was measured by engine rpm and the fishing operation procedures including vessel operations. At the maximum 1,500 rpm in the practical range, the generation amount was 113.6 W. The amount difference in relation to connection method was within 5 W: serial connection was 111.4 W and parallel connection was 115.8 W.
태양광 발전장치 도입에 따른 소형어선 출어경비 절감 연구
이동길(Donggil LEE),정성재(Seongjae JEONG),김성훈(Seonghun KIM),김병관(Pyungkwan KIM),양용수(Yongsu YANG) 한국수산해양교육학회 2017 水産海洋敎育硏究 Vol.29 No.5
In fisheries, studies on development of technologies for reducing fuel consumption of fishing boat to reduce greenhouse-gas emissions have been extensively conducted. In particular, technologies for minimizing hull Resistance and electric ship propulsion with an electric motor have been being studied. Recently, a leisure boat propelled by electric power which is generated by solar power system has been developed. In this study, we investigate maximum daily energy and consumption energy of normal load and surplus power for a test fishing vessel equipped with 200-wattage photovoltaic power generation system. We suggest that maximum dump energy method based on result analysis of surplus energy by test fishing vessel and way of working should be used to reduce the cost of fishing trip effectively.
이동길(Donggil LEE),배봉성(Bongseong BAE),이정호(Jeong-Ho LEE),김석태(Sugtai KIM),김형수(Hyeongsu KIM) 한국수산해양교육학회 2021 水産海洋敎育硏究 Vol.33 No.2
Global marine fisheries resources are showing decreasing trends due to the overfishing and the climate change, and the seafood deficit by the fisheries is replaced by the products from aquaculture industries. However, the aquaculture industry in Korea is experiencing the negative consequences by the decreasing and aging population of fishing village, and the natural disaster such as annual algal blooms (red tide) and abnormally high water temperatures phenomena. The academia and industry of aquaculture are conducting research on the smart aquaculture technology that combines the 4th industrial revolution technologies such as information and communication technology and artificial intelligence (AI) technology to resolve the current difficulties of the aquaculture industries and to secure stable and sustainable aquaculture technologies of the organisms. However, it is not clear to define the concept and definition of the smart or advanced aquaculture technology since it is a new research subject in Korea. Also, there would be diverse ways to develop it. In this study, we suggest the methods how to approach and industrialize on the smart aquaculture technology for the Korean aquaculture environments and management structures. The methods aimed to reduce risks and to stabilize the adaptation process of the smart aquaculture technology.
차량 밸브용 내열강 STR3과 STR35 이종 마찰용접부의 피로수명 예측에 관한 연구
이동길(Donggil Lee),이상열(Sangryoul Lee),김건호(Gunho Kim),정재강(Jaekang Chung) 한국자동차공학회 2001 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The fatigue lifes were investigated and predicted for two kind of heat-resisting steels. STR3 and STR35, to look over the fatigue life of dissimilar friction welding zone by rotary bending fatigue test. A small circular defect were worked at weld interface, 0.5㎜ and 1.0㎜ distance from the interface to look over the fatigue crack propagation behavior according to the notch position.<br/> From the experiment, the fatigue limits of the STR3 and STR35 base metal were 429.0MPa and 409.4MPa respectably. The fatigue life of the STR3 showed about 99% for 1.0㎜ HAZ specimen, about 640% for 0.5㎜ HAZ specimen higher than that of the base metal. And the fatigue life of the STR35 showed about 25% for 1.0㎜ HAZ specimen, about 82% for 0.5㎜ HAZ specimen higher than that of the base metal. But the weld interface specimen was much lower fatigue life than the other specimens because of the weld interface separation.<br/> The fatigue lifes were predicted with an equation of the fatigue crack propagation proposed by Nisitani, d(da/dN) =C(2a)??, the results were found to be within about 5.0% error by comparison with experimented results.<br/> <br/> <br/>
문재인정부 가계통신비 인하 정책을 위한 단말기 유통 구조 개선법의 실효성에 관한 연구
이동길 ( Lee Donggil ),강인성 ( Kang In-sung ) 동의대학교 지방자치연구소 2018 공공정책연구 Vol.34 No.2
문재인정부의 ‘교통, 통신비 절감으로 국민 생활비 경감’이라는 국정 과제를 연구 주제로 선정하였다. 특히 통신비 관련 정책의 핵심이라 할 수 있는 단말기 유통구조 개선법에 대해 알아보고, 그 실효성을 투명성, 효과성, 체감성 측면에서 분석하고자 하였다. 분석결과 먼저, 투명성측면에서 단말기유통구조개선법 도입 후부터 지금까지 핵심 조항들인 지원금의 차별 지급 금지, 지원금의 과다지급 제한 및 공시, 지원금을 받지 아니한 이용자에 대한 혜택 제공, 공정한 유통환경 조성 등은 대체로 잘 지켜지고 있어 유통 과정상의 투명성이 개선되었다. 두 번째, 효과성 측면에서 평균 가계 통신비 지출액이 통계상 꾸준히 감소하였으므로 정책이 가계 통신비 절감이라는 효과성 측면에서도 어느 정도 도움이 되고 있는 것으로 나타났다. 끝으로 체감성 측면에서 통신장비(단말기) 지원금의 감소로 인한 비용의 상승 및 대다수 일반요금제 이용자들의 가용 트래픽 감소로 국민이 체감하는 효과가 크지 않고, 이에 따라 가계통신비에 대한 국민들의 부담감은 크게 줄어들지 않고 있다고 할 수 있다. This study focuses on one of national agendas in Moon Jae-in administration, ‘Saving Households Expenditure by Reducing Transportation and Communication Expenditure.’ In particulare, we attempts to understand and analyze the Mobile Terminal Distribution Act (MTDA) in terms of transparency, effectiveness, and sensitivity because this act is core part of communication expenditure related policies. As a result of analysis, main articles of the MTDA (ban on promotion subsidy discrimination, restriction and announcement on overpayment of promotion subsidy, benefit for the users not receiving promotion subsidy) have been well observed, so transparency of mobile terminal distribution has been improved. Second, the effectiveness through MTDA is proved since average household communication expenditure have reduced after MTDA. Finally, however, sensitivity of the households on the reduction of communication expenditure is weak because there is communication expenditure increase by promotion subsidy decrease and available wife data traffic decrease.
이동길 ( Donggil Lee ),김현영 ( Hyunyoung Kim ),배성윤 ( Sungyoun Bae ),김지연 ( Jiyeon Kim ),도용현 ( Yonghyun Do ),양용수 ( Yongsu Yang ) 한국수산해양기술학회(구 한국어업기술학회) 2018 수산해양기술연구 Vol.54 No.3
In this study, we developed a thermoelectric generation system for coastal fishing boats that allows for a high-density arrangement of thermoelectric modules, verified the improvement in performance by conducting comparative analysis between field test results and results from previous studies. The developed thermoelectric generation system was installed in a 3-ton gill-netter to analyze the engine revolutions per minute and energy production per day for each fishing process over a period of 20 days. From the experimental results, the maximum electric energy generated was 207.1 Wh, the minimum was 53.93 Wh and the average electric energy was 129.98 Wh. In accordance with the increasing of the engine r.p.m., the maximum electric production was 183 W at 1,500 r.p.m. It was approximately 80.5% of designed capacity, 227.2 W. Considering the result in the earlier research was 50.7% of designed capacity, 115.8 W. It was improved by 30% compared to the earlier one. The fishing operation was classified as departure, fishing and arrival. From the result on production analysis of electric energy, the composition of energy was 63% in fishing, 19.5% in departure and 17.5% in arrival. The electric energy production per unit hour was 42.8% in arrival, 32.9% in departure and 24.3% in fishing.
이동길(Donggill Lee),최광무(Kwang-Moo Choe),전길남(Kilnam Chon) 한국정보과학회 1985 정보과학회논문지 Vol.12 No.2
A compiler for the subset of CHILL (CCITT High Level Language) is designed and implemented, considering the developing environment of ESS (Electronic Switching Systems). The compiler developed provides a basis for developing the production quality CHILL compiler KAIST CHILL compiler is developed using the powerful compiler-compiler tools, such as KAIST Parser Generating System and Amsterdam Compiler Kits. 본 연구에서는 ESS 개발환경을 고려하여 production quality CHILL compiler개발의 환경조성을 위한 CHILL subset compiler를 설계 제작하였다. KAIST Parser Generating System 등을 이용하여 front end를 설계 제작하였으며 Amsterdam Compiler Kit로 부터 back end와 intermediate machine의 환경을 제공받아 CHILL subset을 위한 compiler를 설계 제작하였다.