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정밀주조 프로세스에서 피드 스프루의 이상적 구조에 관한 연구
이광열,Lee, Kwang-Yeol 한국결정성장학회 2012 韓國結晶成長學會誌 Vol.22 No.2
정밀주조기술은 수공예에 의한 일품장신구가 규격화, 표준화된 제품으로 대량 생산될 수 있는 기틀을 만들어 주었고 또한 생산라인의 시스템 개선으로 업무의 분업화와 장비의 첨단화로 명실상부한 장신구가 산업으로서의 면모를 갖추는데 지대한 기여를 하였다. 본 연구자는 주조장비가 국내 도입된 이래 약 30여 년 동안 주조장비의 고급화와 업그레이드에 따른 제품의 질이 향상되었다고 볼 수 있으나 주조장비가 100 % 해결해 줄 수 없는 생산 프로세스를 직시하면서 정밀주조 과정에서 매우 중요하다고 판단되는 왁스트리(Wax Tree)공정 시 수행되는 장신구 사출물과 금속이 용해되어 흘러 들어가는 스프루(Sprue)의 연결은 여전히 수작업에 의해 진행이 되고 있고 이 과정에서 원하는 결과물이 나오는데 많은 영향을 미칠 수 있다는 문제점을 실험데이터를 바탕으로 하여 좀더 완벽한 정밀주조의 프로세스를 수행하기 위한 방안 제시를 하고자 한다. Maintenance training is generally provided to teach employees new knowledge and techniques in order to increase their qualities. It means that the purpose of maintenance training is to increase an employee's knowledge or technique level and to maintain or increase their performance level through continuous training in their field, and the methods, contents and the level of training vary depending on the type of job they perform. Maintenance training is more important for jobs that require continuous technical increases or research, or for professional jobs that continuously require new knowledge and techniques. The purpose of this study is to provide quality service to consumers by responding to the rapidly changing jewelry distribution environment and to quickly and accurately acquire new and advanced jewelry inspection and appraisal techniques, and to contribute to the healthy consumption culture through a general quality increase in the jewelry industry.
플라즈마 표면처리 지오텍스타일의 공학적 성능 평가 및 장기성능 고찰
이광열,고은희,김수경,오태환,한성수,전한용,Lee, Kwang Yeol,Ko, Eun Hee,Kim, Su Kyung,Oh, Tae Hwan,Han, Sung Soo,Jeon, Han-Yong 한국섬유공학회 2012 한국섬유공학회지 Vol.49 No.5
Woven and nonwoven geotextiles and geotextile composites were used to examine engineering property improvement by plasma surface treatment. Hydrophobic and hydrophilic plasma treatment were applied to these geotextile samples with plasma gas, electric power, plasma treatment time and gas flow rate. It is seen that tensile strength of geotextile samples increased after plasma treatment, but chemical resistance had not significantly changed. Finally, long-term performance of plasma treated geotextiles was reviewed through application of Arrehenius equation as an accelerated analysis.
폐기물 매립지 차수재 HDPE 지오멤브레인 보호용 토목섬유가 꿰뚫림 저항 평가
이광열,장용채,정진교,주창환,전한용,Lee, Kwang-Yeol,Chang, Yong-Chai,Chung, Chin-Gyo,Joo, Chang-Whan,Jeon, Han-Yong 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.3
This study is focused on the protection effects of geosynthetics installed on HDPE water barrier in waste landfill to resist against puncture loads. It was conducted by a model test with various types of puncture loads created by different shapes of tools. The puncture resistance of geosynthetics installed as a protective material on HDPE (High density polyethylene) water barrier is varied with the sizes of geosynthetics and types of puncture loads. Finally, it was found that the protection effect for all kinds of geosynthetics when a truncated cylindrical shape of puncture tool is used is lower than others. Also, geocomposite as is the most effective against puncture for all types of puncture loads.
어류폐사의 발생 이후 하천에서 수질의 변화 및 어류상 회복
이재용 ( Jae Yong Lee ),이광열 ( Kwang Yeol Lee ),이새로미 ( Sae Ro Mi Lee ),최재석 ( Jae Seok Choi ),이석종 ( Seok Jong Lee ),정성민 ( Sung Min Jung ),정명숙 ( Myoung Sook Jung ),김범철 ( Bom Chul Kim ) 한국하천호수학회 2013 생태와 환경 Vol.46 No.2
The species composition of the fish community was studied in four streams where fish kills have previously occurred in recent years; Worun Stream, Seo Stream, Jangnam Stream, and the Anyang Stream. The number of fish species varied from 22 to 86% compared to the number of fish species pre-fish kill. The recovery of fish populations in the streams seems to be determined by water quality and the presence of artificial structures in the streams. The Jangnam Stream, where alkaline pH caused a fish kill, showed a high recovery of fish species due to improvements in water quality. Anyang Stream had a low number of species, possibly because dissolved oxygen concentrations were intermittently low. Artificial structures in streams had a negative impact the recovery of fish species, particularly for benthic fish species. It appears that fish populations can recover rapidly when water quality improves or the movement of fish community is unimpeded. However, water quality and artificial structures in many streams in Korea still present adverse conditions for fish survival, deterring the recovery of fish populations. To conserve fish populations in streams, habitat all owing unimpeded movement for fish and controls on pollutant inputs are needed.
이광열(KY Lee),탁영오(YO Tak),김상경(SK Kim),김재욱(JU Kim),권기상(KS Kwon),하숙태(ST Ha) 대한산부인과학회 1991 Obstetrics & Gynecology Science Vol.34 No.6
Smooth muscle tumors of the female genital tract arise mostly from the uterine myometrium, and only rarely from the broad ligament. We experienced a case of leiomyoma and another case of leiomyosarcoma. For the case of leiomyosarcoma, 3 years of follow-up has been performed. In the respect of rarity, we report these two cases with a brief review of the literatures.