해양수산업 고용 동향 분석

김기수(Gisu Kim),최석우(Seokwoo Jake Choi),김주현(Juhyeoun Kim) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.5

본 연구는 경기적, 구조적 나아가 COVID-19와 같은 불가항력적 상황과 같은 급변하는 일자리 환경변화에 대응하고 해양수산 분야 주요 산업별 고용 현황을 파악하여 해양수산업의 일자리 정책 수립에 근간이 되는 객관적인 지표를 제공을 목적으로 한다. 하지만 기존의 통계청과 고용노동부 자료는 표준산업분류를 기준으로 하고 있으며 해당 분류 체계의 다양한 분야에 산재한 해양수산업의 고유한 특성을 반영한 일자리 현황을 파악하는 것은 제한적인 상황이다. 따라서 본 연구에서는 해양수산업 특수분류체계를 바탕으로 해양수산부 내부자료를 활용하여 2018년 4분기를 기준시점으로 2020년 4분기의 고용동향을 살펴보고자 한다. 조사 결과 2018년 4분기를 기준시점(=100)으로 2019년에는 소폭 감소하다 2020년 1분기 102.1로 가파른 상승 후 다시 지속적 감소하는 추세를 보였다. 2020년 2분기 이후 지속적 감소는 COVID-19에 따른 경기 침체와 소비 위축에 따른 결과로 해석된다. 게다가 해양수산업 사업체들은 사회 경제적 변화에 따른 영향 중 COVID-19 사태로 인한 매출 영향이 가장 큰 것으로 파악된다. 본 연구는 분기별 해양수산 특수분류체계에 따른 세부산업별 고용 동향을 살펴 실무적, 정책적 제언에 기여할 수 있는 바가 큼에도 불구하고 모집단의 특성상 사업체만을 대상으로 하고 있기에 어업인에 관한 구체적인 동향을 살피기에는 한계가 존재한다. 추후 연구에서는 사업체와 어업인들 모두 고려한 종합적인 해양수산업의 종사자 현황과 추세를 파악하고 시계열 데이터를 축적하여 유의미한 결론을 도출해야 한다. This paper aim to provide objective indicators that are the basis for establishing employment policies in ocean and fisheries by responding to rapidly changing job environments according to economic or structural and also irresistible force situations such as COVID-19 virus. However, traditional data from the Statistics Korea and the Ministry of Employment and Labor are based on standard industrial classification, and it is limited to understand the current status of jobs reflecting the unique characteristics of ocean and fisheries. Therefore, this study examined the employment trends of the Q4 2018 as of Q4 2020 by utilizing data from the Ministry of Oceans and Fisheries based on the basis of the special classification. As a result of analysis, the number decrease slightly in 2019 from base point (=100) in the fourth quarter of 2018 and continued to decline again after a steep rise at 102.1 in the first quarter of 2020. Continuous decrease after Q2 2020 is interpreted as a result of the economic downturn and shrinking consumption caused by COVID-19. Although this study can contribute to operational and political implications by looking at employment trends on detailed industries according to the special classification system of ocean and fisheries by quarter, there are limitations to analyze specific trends about fishermen. Further research may identify the status and trends of workers comprehensively in the ocean and fisheries industry considered by both businesses and fishermen, and accumulate time series data to draw more significant operational implications.

전기 자동차 냉각수 공급 모듈 시스템 기밀성능 해석에 관한 연구

김기수(Gisu Kim),이정선(Jeongsun Lee),김동철(Dongchul Kim),송명의(Myeongeui Song),조우연(Wooyeon Cho) 한국자동차공학회 2023 한국 자동차공학회논문집 Vol.31 No.3

In this paper, the sealing performance of the reservoir tank of the coolant supply module under the thermal management system was studied by using CAE, which considers the hyperelastic and viscoelastic properties of the O-ring. The type of rubber used in this research is the EPDM rubber, which was modeled under the Parallel Rheological Frameworks. The material model was drawn from the Marlow model that used uniaxial tension test data, and the hyperelastic properties, Mullins effect, and permanent set properties were considered. Moreover, in the O-ring sealing analysis, the viscoelastic properties according to time change were applied to the model, and leakage was determined based on the result of the contact pressure. In the analysis, the change in the temperature of the system over time was considered as a major factor. An experiment was conducted to verify the proposed method of analysis, and its validity was verified after confirming the correlation between the FEA result and the experiment. An analysis of various factors that were estimated to cause O-ring leakage was performed, and, finally, a design to improve contact pressure was proposed and verified. Through the method proposed in this paper, it became possible to analyze the sealing performance of thermal management system products that were operating in complex environmental conditions. It is expected that the level of product development will further improve as various design elements, such as product cost reduction and weight reduction, can be reviewed.

동적계획법을 이용한 자작 하이브리드 자동차의 용량 매칭

김기수(Gisu Kim),김진성(Jinseong Kim),박영일(Yeong-il Park) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.5

Generally, the fuel economy of hybrid electric vehicle (HEV) is effected by the size of each component. In this study the fuel economy for HEV of our own making is evaluated using backward simulator, where dynamic programming is applied. In a competition, the vehicle is running through the road course that includes many speed bumps and steep grade. Therefore, the new driving cycle including road grade is developed for the simulation. The backward simulator is also developed through modeling each component. A performance map of engine and motor for component sizing is made from the existing engine map and motor map adapted to the HEV of our own making. For optimal component sizing, the feasible region is defined by restricting the power range of power sources. Optimal component size for best fuel economy is obtained within the feasible region through the backward simulation.

시뮬레이터를 이용한 중형 저상버스의 주행성능 예측

김기수(Gisu Kim),김진성(Jinseong Kim),박영일(Yeong-il Park),이치범(Chibum Lee) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.5

In this study, the performance of a low-floor midsize bus under development is predicted through simulations. To predict the vehicle’s acceleration, maximum speed, and uphill driving performance, a forward simulator which calculates the vehicle power is developed. Also we verify the forward simulator by comparing simulations and test result for benchmarking vehicle. To predict the fuel consumption, we use a backward simulator for a specified road cycle. However, to predict the fuel consumption using the backward simulation the engine fuel-consumption map is needed. The engine fuel-consumption map extracting data from a similar sized diesel engine is used by re-scaling the maximum torque. As a result, we simulate the vehicle’s forward performance with a new engine. Further, we simulated the backward performance to optimize the fuel efficiency and gearshift timing.

공장의 매매가격 결정요인에 관한 연구

김기수(Gisu Kim),박문수(Munsu Park) 한국주거환경학회 2024 주거환경(한국주거환경학회논문집) Vol.22 No.1

Research on the factors influencing the sale price of industrial complex factories, which play a crucial role in the entire manufacturing industry in Korea, is still incomplete. In this study, we empirically analyzed the characteristics of factories in industrial complexes to determine their impact on the sale price. This empirical analysis is based on data collected from 333 factories in the three main industrial complexes of small and medium enterprises in the metropolitan area: Banwol, Sihwa, and Namdong. The analysis results are as follows. First, in terms of location characteristics, the distance from highway interchanges and the distance from the subway station have a negative (-) the transaction price, while proximity to a main road has a positive effect. Second, concerning the building's characteristics, a larger the land area and total floor area, as well as a more complex main building structure, have a greater positive impact on the transaction price. However, the useful life negatively affects the transaction price because of physical and functional depreciation. Third, it was confirmed that the industry factory's industry affects the transaction price in relation to industry characteristics. Fourth, concerning regional policy characteristics, the designation of a regeneration business district has a positive impact on the transaction price. Therefore, manufacturing companies interested in acquiring factories in industrial complexes should conduct precise calculations of sales prices and make purchase decisions based on a medium- and long-term valuation and analysis of industrial properties and manufacturing companies . This should involve thorough consideration of location, building, industry, buyer, and regional policy characteristics specific to the main industry.

전동식 워터펌프 진동 소음 특성에 관한 연구

김기수(Gisu Kim),이정선(Jeongsun Lee),송명의(Myeongeui Song) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11

동력 분배비를 이용한 경주용 하이브리드 자작자동차 주행 전략 분석

김기수(Gisu Kim),김진성(Jinseong Kim),박영일(Yeong-il Park) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5

디젤 중형저상버스의 병렬형 하이브리드화 및 용량 설계

김기수(Gisu Kim),김진성(Jinseong Kim),신재훈(Jaehoon Shin),박영일(Yeongil Park),이치범(Chibum Lee) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5

하이브리드 자동차 제작과 주행

김기수(Gisu Kim),장동국(Dongkuk Jang),김병수(Byungsu Kim),주문경(Moonkyung Joo),신현승(Hyunseung Shin),박영일(Yeongil Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11

This thesis covers consequence about driving on the road with hybrid vehicle that is designed by ourselves. We make successful result with Li-Ion batteries that replace previously existing lead storage batteries. It brings about innovation of weight lightening and vehicle performance. This vehicle is designed with careful consideration for driver. For example, slide-resist enables drivers to maintain a constant speed as cruise mode. In addition, Driver can check the batteries condition with S.O.C on dashboard. It is also possible that driver can easily switch driving mode (electric/engine/hybrid). With hybrid vehicle engineered like so, we drives on the real road. This test makes it clear about safety, efficiency and other performances of vehicle.

중형저상버스 병렬형 하이브리드화를 위한 동력전달계 용량매칭

김기수(Gisu Kim),박영일(Yeong-il Park),노윤식(Yun-sik Ro),정재욱(Jae-wook Jung) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.8

그 동안 하이브리드 버스에 대한 연구로 플러그인 하이브리드, 직렬형, 병렬형 하이브리드 등에 대한 연구가 많이 진행되어져 왔다. 하지만 연구가 진행된 대부분의 차량들은 대형 버스이며 현재 국내에는 중형저상버스에 대한 연구는 전무 한 실정이다. 또한 중형저상버스의 하이브리드화에 대한 연구 역시 미미한 실정이다. 본 논문은 MATLAB을 이용한 시뮬레 이션을 통해 디젤 중형저상버스의 연비 평가를 수행하였으며, 이를 하이브리드화하였을 경우에 대한 최적의 용량 조합과 기어비를 제시하고 내연기관 시뮬레이션 연비 결과와 비교 분석하였다. 하이브리드화를 위한 구조로 전륜과 후륜이 독립적 으로 동력을 전달하는 병렬형 하이브리드 시스템을 선택하였다. 동력원 용량 설계를 위해 목표 성능을 만족하는 요구파워를 계산하여 적용 가능한 동력원 용량 영역을 설계하였다. 설계 영역을 만족하는 각 단품들의 용량은 스케일링하여 구성하였으 며, 엔진과 모터에 대한 동력 전달계의 용량 설계 알고리즘을 제시하고 동적 계획법을 이용하여 최적화를 수행하였다. 최종적 으로 본 연구를 통해 내연기관 차량인 중형저상버스를 하이브리드화하였을 경우에 대한 연비 향상률과 최적의 동력원 용량, 기어비를 제시하였다. Most studies on hybrid buses are on large-sized buses and not mid-sized low-floor buses. This study uses MATLAB simulation to evaluate the fuel efficiency of such buses powered by diesel. Based on the results, a hybrid electric vehicle system is recommended for the best combination of power and gear ratio. A parallel hybrid system was selected for the hybridization, which transmits front and rear wheel power independently. The necessary power to satisfy the target performance was calculated, and the applicable capacity area was designed. Dynamic programing was used to create and optimize a component sizing algorithm, which was used to scale the capacity of each component of the power source to satisfy the design criteria. The fuel efficiency rate, optimum power source capacity, and gear ratio can be improved by converting a conventional bus into a parallel hybrid bus.