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이영재(Lee, Youngjae) 한국산업경제학회 2022 산업경제연구 Vol.35 No.5
표준적으로 사용되는 노동생산성 개념은 간접고용 노동자(파견, 사내하청, 용역 등)를 포함하지 않기 때문에 간접고용 비중이 높을수록 기업의 노동생산성에 더 큰 편의를 유발한다. 본고는 간접고용을 보정한 노동생산성을 계산하고 이를 이용해 간접고용이 노동생산성에 미치는 영향을 분석하였다. 기업규모가 클수록 간접고용 사용비중이 높아져 더 큰 노동생산성 편의가 발생하였다. 편의 규모는 중소기업이 3.9~4.4%, 대기업이 8.7~11.2%로 계산되었다. 간접고용과 노동생산성의 관계는 기업의 소요기술 특성별로 다르게 나타났다. 간접고용이 노동생산성에 미치는 영향은 비숙련노동 위주의 제조기업에서는 단정 지을 수 없었으나 고숙련노동 위주의 제조기업에서는 노동생산성을 낮추는 것으로 작용하였다. 반면 기술변화가 빠르고 다양한 전문지식을 갖춘 노동력에 대한 수요가 있는 고위기술 서비스기업에서는 간접고용이 노동생산성을 높였다. 이러한 결과는 기업이 자신의 기술특성을 충분히 고려하여 간접고용 활용 정도를 결정할 필요가 있음을 시사한다. The standard labor productivity do not consider labor outsourcing, such as seconded workers, in-house contractors. It causes labor productivity bias when a firm heavily depends on labor outsourcing to produce its output. This paper estimates new labor productivity considering both directly hired and outsourced worker, and analyzes the impacts of labor outsourcing on labor productivity using the new measures. According to the results of an analysis of manufacturing firms, the larger the firm, the higher the level of labor outsourcing, resulting in a more significant upward bias for labor productivity. The level of such upward bias is around 3.9%-4.4% for small and medium-sized firms and 8.7%-11.2% for large firms. The relation between labor outsourcing and labor productivity is found to vary depending upon the characteristics of the technologies adopted by firms. We cannot draw certain relation about the impacts of labor outsourcing on the labor productivity of unskilled labor-driven manufacturing firms. Labor outsourcing, however, reduces labor productivity for high-skilled labor-driven manufacturing firms. On the other hand, for high-tech service firms that undergo rapid technological change and require labor with diverse expertise, labor outsourcing increases labor productivity. These results imply that a firm should make labor outsourcing decisions after sufficiently considering its technological characteristics (unskilled/skilled and low-tech/high-tech), instead of simply following what leading companies are doing.
운전조건이 하이브리드 자동차의 연비에 미치는 영향 연구
이영재(Youngjae Lee),김강출(Gangchul Kim),표영덕(Youngdug Pyo) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.3
In the present study, the influence of operating conditions on fuel economy for hybrid electric vehicle was analyzed. In order to accomplish this, vehicle speed, engine speed, battery current and voltage, SOC (state of charge), motor speed and torque, generator speed and torque, engine coolant temperature etc. were measured in real time. The tests were carried out under different driving cycles which are urban and highway cycles, KOREA CITY cycle and on-road driving. and also under various operating conditions such as different initial SOC, with or without regenerative braking etc.. Generally, conventional gasoline engines show a poor fuel economy at stop and go driving, because braking energy is wasted and the engine is operated in low thermal efficiency regions. However, in case of hybrid vehicles. higher fuel economy can be obtained because of utilizing the maximum thermal efficiency regions of engine, idling stop of engine, and regenerative braking etc..
가솔린엔진을 개조한 분산전원용 11㎾급 천연가스엔진의 성능 최적화
이영재(Youngjae Lee),표영덕(Youngdug Pyo),김강출(Gangchul Kim),오시덕(Sidoek Oh) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.3
Cogeneration is an energy conversion process, where electricity and useful heat are produced simultaneously in one process. Also, carbon dioxide emissions can be reduced as well. The cogeneration process may be based on the use of steam, gas turbines or combustion engines. However, there have been few models with an output of less than 100 kilowatt. In the present study, a spark ignited gas engine with generation output of 10 kilowatts was developed for micro cogeneration package. The gas engine shows 29.2% of thermal efficiency under Stoichiometric combustion and 33.6% of thermal efficiency under lean combustion. NOx emission shows less than 10ppm at 13% oxygen under stoichiometric combustion and about 100ppm at 13% oxygen under lean combustion.
이영재 ( Youngjae Lee ),김문기 ( Moongi Kim ),장형규 ( Hyeongkyu Jang ) 한국농공학회 2015 한국농공학회 학술대회초록집 Vol.2015 No.-
너울성 파도, 이안류 및 상어, 해파리, 깊은 수심으로부터 가장 안전한 소독약이 필요 없는 바다풀장의 안전성을 평가한 결과 바다풀장의 내벽은 0.5m가 가장 안전하였고 내구성 확보에는 40MPa가 외부 파고가 3m 때 안전성에 가장 유리한 것으로 나타났다.
뿌조 607 HDI 경유승용차의 매연여과장치 재생특성분석
이영재(Youngjae Lee),김강출(Gangchul Kim),표영덕(Youngdog Pyo),정요일(Youngil Jeong) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Diesel engines have advantages of not only durability and robustness but also lower fuel consumption and carbon dioxide emission compared to gasoline engines. However, diesel engines emit higher particulate matters(PM) and NOx, which is fatal disadvantage. In order to cope with PM emission, PSA Peugeot Citroen introduced the DPF equipped diesel passenger car, 607 HDI Sedan, in May 2000 at the ve교 first in the world. This DPF system is an active and passive combination type operated with a SiC filter, an oxidation catalyst, Cerium-Based Fuel-Borne Catalyst, and post injection technology. In the present study, the regeneration characteristics of DPF in Peugeot 607 HDI was examined on the chassis dynamometer and on-road driving test. Various parameters such as vehicle speed, engine rpm, exhaust gas temperature upstream DPF and differential pressure between DPF were measured, and fuel economy and exhaust emissions are analyzed as well.<br/>
이영재 ( Youngjae Lee ),장형규 ( Hyeongkyu Jang ),김문기 ( Moongi Kim ) 한국농공학회 2015 한국농공학회 학술대회초록집 Vol.2015 No.-
4대강에 건설된 자연형 우회수로형 어도의 개선을 위해 범용 구조해석 프로그램인 SAP2000으로 해석한 결과 1m×0.8m, 유속 0.8m/s일 때 1m×0.8m, 유속 1.6m/s일 때 보다 최대응력은 23.62% 전단응력은 20.18% 감소한 것으로 나타났다.