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유병일,성규철,김의경,김사일 ( Byung Il Yoo,Kyu Chul Sung,Eui Gyeong Kim,Sa Il Kim ) 한국산림과학회 1985 한국산림과학회지 Vol.71 No.1
In the study, the log pricing process by region and marketing agencies was surveyed in order to analyze the domestic timber marketing situation, and to propose improvements. The results obtained show that the market channel configuration for domestic timber is simple compared with that for the agricultural products. The log felling contractor is the lead agency in the stumpage market because of the lack of market information of most forest owners. However, the log assembler, who has ample funds, seized leadership in the market channel because most felling contractors, deal only with small timber quantities, and are usually short of funds. Also the variety of log scaling methods is a serious factor confusing domestic timber marketing. Therefore, the following steps are proposed; 1) the provision of market information to forest owners, 2) the institutional control of felling contractors, 3) the establishment of cooperative log collection centers, 4) the improvement of log quality.
메타버스 기반 교육 콘텐츠 제작 및 기준 제시에 대한 연구 - 화학 원자 및 분자의 구조에 관해
윤경록(Kyeung-Rok Yun),권동영(Dong-Yeong Kwon),유병일(Byung-Il Yoo),김기훈(Gi-Hun Kim),김태헌(Tae-Heon Kim),이정우(Lee Jeong Wu),정설영(Seol Young Jeong) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.6
코로나19가 전 세계적으로 발병함으로써 비대면 교육이 확대되었다. 하지만 기존의 온라인회의플랫폼 및 화상강의로 실시하는 강의는 학습자의 교육 만족도를 저해하였고, 재학습이 가능하다는 장점이 있었지만, 수동적인 학습에 그쳤다. 본 논문에서는 메타버스 기반 교육 콘텐츠 적용 시 장점을 탐색하고, 이에 따른 콘텐츠 개발 기준을 확립한다. 그리고 기준에 부합하는 화학 교육 콘텐츠 원자와 분자의 구조를 개발함으로써 이에 따른 장점을 분석한다. As outbreak of COVID-19, Government extend online education policy. But prior online-meeting-platform and online lecture with it hinder student’s educational satisfaction. Though it has advantage of repetitive play, it just stopped passive education. In this study, we will search for educational advantage of metaverse educational contents, and suggest educational standard. With these standards, we develop metaverse educational contents – about atom and molecule structure and analyze it’s advantage.
75톤급 연소기 연소시험을 위한 지상시험설비 구축 현황
이광진(Kwang-Jin Lee),김승한(Seung-Han Kim),유병일(Byung-Il Yoo),정용갑(Yong-Gahp Chung),조남경(Nam-Kyung Cho),김성룡(Seong-Lyong Kim),한영민(Young-Min Han) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
본 논문은 75톤급 연소기의 연소시험을 위한 지상시험설비의 구축 현황을 다루고 있다. 이 시험설비는 유공압 시스템, 제어/계측 시스템, 테스트 스탠드 및 가스 덕트 냉각 시스템 등으로 구성된다. 현재 시험설비 내 필수 구성요소들의 기능 확인을 위한 시운전이 진행 중에 있으며, 이 시운전 단계가 종료되고 시험설비가 정상 가동되면 한국형발사체 개발을 위한 연소기 연구 일정과 비용 단축에 영향을 줄 것으로 기대된다. This paper covers construction status of ground test facility for hot-firing test of 75tonf-class combustion chamber. This facility consists of several systems: hydro-pneumatic system, control and measurement system, test stand and gas duct cooling system, etc. Start-up test is currently underway to confirm the function of the essential component in the test facility. After start-up test, performing of normal operation of this facility would be expected to have an effect on schedule and cost reduction of combustion chamber research for KSLV-Ⅱ development.
조남경(Nam-Kyung Cho),서대반(Dae-Bahn Seo),유병일(Byung-Il Yoo),김승한(Seong-Han Kim),한영민(Yeong-Min Han) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
극저온 액체산소나 액체수소를 사용하는 액체로켓 엔진의 경우 냉각이 충분하지 않을 경우 펌프 인입부에서 발생하는 케비테이션과 메니폴드부의 급격한 기화에 의한 서지현상이 발생할 수 있다. 극저온 추진제 사용을 위한 냉각은 크게 유로의 충전을 위한 냉각/충전단계와 충전 후 온도유지 단계로 구분된다. 냉각/충전 단계는 초기에는 액체가 전량 증발하여 생성된 기체가 냉각을 수행하며 이후 이상유동(two phase flow) 단계를 거쳐 단상 액체로 충전된다. 충전 후 온도유지 단계는 밀도차에의한 재순환과 배출방법이 있다. 본 논문에는 액체로켓 추진기관의 극저온 추진제 충전단계와 충전 후 온도 유지단계에 대한 전반적 내용을 소개한다. For liquid rocket using cryogenic liquid hydrogen or liquid oxygen, chilling is needed to avoid cavitation and surge problems. Chilling is categorized by initial chilling/filling stage and low temperature maintaining stage. During chilling and filling stage, initially all vapor, next two phase flow and finally single phase flow are revealed. For temperature maintaining stage, re-circulation by density gradient and drain are related. This paper describes overall aspects of filling and low temperature marinating stage
이정익(Jeong-ick Lee),이응석(Eung-seog Lee),유병일(Byung-il Yoo) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.10
Thin film manufacturing process is placed on the main technology of semiconductor manufacturing process, high resolution technology of hard and laser disk, plate disc player manufacturing process of LCD/PDP. Futhermore, this process is used as general technology in deposition and electric wave cover of mobile phone cover, reflecting plate of lamps, cosmetic vessel, optics surface coating of camera lens and coating film producing of several goods. In this research, the main purpose is developing in electric heat resistive using as basic material in semiconductor manufacturing process and many industrial processes. The developing process is as follows. Electron beam is emitted by heating of tungsten filament in high vacuum environment. Then electrons are accelerated in high voltage. The electrons are collided into opposite material. The opposite material is coating by producing heat. The first year of research is for mechanical property of filament wire per diameter and computer aided engineering for developing high efficiency electric heat resistive. The second year of research is focused on development of automatic inspection line for mass production. If electric heat resistive is developed through this project, the product could be having a product power because of high efficiency, high cost effective and comparing to foreign goods.
조남경(Nam-Kyung Cho),서대반(Dae-Bahn Seo),유병일(Byung-Il Yoo),김승한(Seong-Han Kim),한영민(Yeoung-Min Han) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.3
For rockets using cryogenic liquid hydrogen or liquid oxygen, chilling is required to avoid cavitation and surge problems. Chilling is categorized by the initial chilling/filling stage and the low-temperature maintenance stage. In addition, to improve satellite insertion capability, a multi-ignition capability is required and accordingly chilling to prepare for the next ignition during low-gravity coasting is also required. This paper describes the overall aspects of filling and low temperature maintain marinating for the booster and the upper stage engine including chilling for multi-ignition.