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기술사마당_기술해설 - 감속기 수명 연장을 위한 오일 순환시스템의 마모분석 해석
이재근,Lee, Jae-Keun 한국기술사회 2010 技術士 Vol.43 No.2
This analysis introduces a lube oil circulation system for a big reducer in the chemical process industries. We have been operating the system and found out that the system greatly helped us save the maintenance cost by increasing the lifetime of the reducer.
이재근,Lee, Jae-Geun 한국기술사회 2008 技術士 Vol.41 No.3
Recently most companies require various type of energy sources, in order to be more energy efficient in their plant due to the increasing current oil price. So, the multi-national companies are shaping ideas how to reduce energy costs and use substitute energy. The purpose of this study Is to attempt to save energy by making more valuable high pressure steam through TVR(Thermal Vapor Recompressor) from the surplus low pressure steam of HRB(Heat Recovery Boiler) in sulfuric acid plant.
뉴스초점 - 광유와 합성유의 에너지 소비량, 온도변화 등의 성능시험 비교 고찰
이재근,Lee, Jae Keun 한국기술사회 2012 技術士 Vol.45 No.6
Namhae chemical is one of the largest fertilizer manufacturing company in Korea which company has operating 4 unit agitator gear boxes and producing variety kinds of fertilizer production. The gearbox operating temperature of agitator is approximated in $55^{\circ}C{\sim}90^{\circ}C$ and required to keep operating continuous without stopping. The system required high performance oil and longer oil drain interval as limited workforce in maintenance team. It was lubricated by mineral gear oil of ISO VG 320 and also need to change to new oil frequently. Namhae Chemical would expect to keep stable operating condition without shut down and consider, lower cost of operation and equipment protection.
이재근,송해범,정선부,홍기창 ( J . K . Lee,H . B . Song,S . B . Jung,K . C . Hong ) 한국축산학회 1980 한국축산학회지 Vol.22 No.2
This experiment was carried out to determine the optimum amount of semen (sperm number) to use per injection in artificial insemination of hens. the experimental birds used were 240 hens of White Plymouth Rock inbred line and 20 cocks of Australorp pure line at 7 months of age. The four treatments compared were: 0.005 ㎖ or 16 to 18 million sperm per insemination (T1), 0.01 ㎖ or 32 to 36 million sperm (T2), 0.02㎖ or 64 to 72 million sperm (T3), and 0.03 ㎖ or 96 to 108 million sperm (T4). thirty birds were allotted per treatment within a replication, and there were two replications in the experiment. Ringer`s Solution were used for diluent of semen(1:3), and semen was inseminated within 30 minutes after collection. The hens were inseminated 4 times with the intervals of 4 days. The results obtained are summarized as follows. 1. The fertility for four days after the second insemination was 46.4% for the T1, 72.9% for T2, 73.3% for the T3 and 86.3% for the T4. The fertility of the T1 was significantly lower than the others, but the differences among T2, T3 and T4 were not significant. These results agree with the previous report (1978). 2. The fertility for 4 days after the 3rd insemination was 71.0% for the T1, 73.4% for the T2, 73.3% for the T3 and 77.1% for the T4, and t he fertility after the 4th insemination was 70.4% for the T1, 65.7% for the T2, 69.2% for the T3 and 79.3% for the T4. None of the differences among the treatments were statistically significant in each ease. It was concluded that the insemination of 0,005㎖ (16 to 18 million sperm per insemination) can attain the same level of fertility as the insemination of 0.01 ㎖ to 0.03㎖ after the 3rd or 4th insemination. 3. In view of the results obtained in this study, the least optimum dose of semen in the case of 4 days interval was estimated to be within the range from 0,005㎖ to 0.023㎖
정보기술의 진화과정 측면에서 본 중개형 e-마켓플레이스의 발전방향
이재근,Lee, Jae-Keun 한국정보기술전략혁신학회 2003 情報學硏究 Vol.6 No.1
In recent years, the number of public e-Marketplaces have grown according to the leap-frogging advancement of network technology based on open communication architecture named Internet. However, the transaction volume through public e-Marketplaces have been an immaterial increase, and some well-known sites closed their businesses. This study proposes the public e-Marketplace as an e-Business system which has been recognized the most strategic application of business information technologies (Barrett & Konsynski, 1982; Cash & Konsynski, 1985), and suggests some future strategic and technological direction which supports a firm's transaction infrastructure under internet architecture. For this purpose, it reviews evolution of business information technologies.