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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.
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.
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.
이광열(Kwang-Yeol Lee),원종서(Jong-Seo Won),박승철(Seung-Chul Park) 국립공원연구원 2021 국립공원연구지 Vol.12 No.2
본 연구는 덕유산국립공원의 서식지에 따른 어류상 및 어류군집의 특성을 분석하기 위해 수행되었다. 덕유산국립공원의 주요 하천에서 공간균등계층추출법으로 총 16개 지점을 선정하였으며, 계절별로 3회 조사하였다. 각 서식지의 물리적 환경은 대부분 산간계류형(Aa) 및 중상류형(Aa-Ab) 하천이었으며, 하상구조는 큰돌과 자갈이 산재되어 있었다. 또한 평균고도는 540.9m, 평균 유수폭은 11.0m, 평균수심 47.3㎝로 대부분 1m를 넘지 않았으며, 하천차수는 2차~5차 하천까지 분포하였다. 서식지별 물리적 환경요인에 대하여 주성분 분석을 실시한 결과 고도에 따라 하상물질 특성이 달라지는 것으로 나타났다. 어류조사 결과 출현한 어종은 총 5과 9종 1,609개체가 확인되었으며, 우점종은 참갈겨니(72.0%), 아우점종은 버들치(18.5%), 한국고유종은 쉬리를 포함하여 6종(66.7%)이었다. 어류군집의 순위풍부도 곡선 모형을 분석한 결과 16개 지점 중 7개 지점에서 Zipf 모형이 적합한 것으로 나타났으며, 선점 모형 3개 지점, 무효 모형 지점 1개 지점, 그밖에 5개 지점은 1종만이 출현하여 분석이 불가능하였다. 환경요인에 따른 어류군집의 특성을 파악하기 위해 16개 지점과 출현종을 대상으로 정준상관 분석을 실시한 결과 고도와 유수폭, 하천차수 등의 차이로 인하여 어류군집이 구분되었다. This study was conducted to analyze the current status of fish fauna and characteristics of the fish community according to the habitat of Deokyusan National Park, Korea. The spatially balanced sampling selected 16 stations from major stream of Deokyusan National Park, and three surveys were conducted each season. The physical environments of the habitat were mostly mountain streams (Aa) and upper-middle stream (Aa-Ab), with large stones and gravels scattered over the stream. The average altitude of the habitat was 540.9m, the average flow width was 11.0m, and the average depth of water was 47.3㎝, being less than 1m in most stations, and the stream order was distributed from 2nd to 5th. The principal component analysis of the physical environmental factors by habitat showed that the substrate properties differed according to the altitude. The survey identified a total of 1,609 individuals in 9 species belonging to 5 families. The dominant species was Zacco koreanus (72.0%), subdominant species was Rhynchocypris oxycephalus (3.8%), and the Korean endemic species was 6 species (66.7%) including of Coreoleuciscus splendidus. Analysis of the rank abundance curve model in the fish community showed the Zipf at 7 out of 16 stations, the Preemption model in 3 stations, and the Null model in 1 station. The remaining 5 stations showed only 1 species and were not analyzed. The canonical correspondence analysis of 16 stations and fish species was performed to understand the characteristics of the fish community according to environmental factors. The fish communities were divided according to differences in habitat environment by the altitude, flow width and the stream order.