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A Study on the Backward Extrusion of Internal Spline
YongIl Cho(조용일),JongUng Choi(최종웅),Yuangen Qiu(추연근),Heayong Cho(조해용) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.9
Spline is a machine component using transmits rotating energy with grooves on internal of boss and external periphery of shaft. Internal spline is generally produced by machining process. However, to reduce manufacturing cost and save time, plastic deformation process such as backward extrusion is gradually adapted for spline production. In plastic deformation process, forming load, stress on tools and flow flaws should be taken into account to have sound products. For this purpose, kinematically admissible velocity fields for Upper Bound Method in backward extrusion of internal spline has been suggested, then forming load and relative pressure have been calculated. Internal spline forming experiments have been con-ucted under hydraulic press and the calculated forming load well predicts the load of experiment.
한국과 일본 대학교 구성원의 그린캠퍼스 인식 비교 연구
구자건(Jakon Koo),조용일(Yongil Cho),이승용(Seungyong Lee),김주향(Juhyang Kim),정종철(Jong Chul Jeong),김용범(Yong-Bum Kim) 한국환경교육학회 2012 環境 敎育 Vol.25 No.2
Green campus means the environmentally-conscious universities that are trying to increase campus sustainability by reducing carbon emissions, expanding eco-friendly activities. This study was carried out to compare the recognition level on green campus between Korea and Japan universities. For investigating the recognition level of students and faculties on green campus, the questionnaire surveys were conducted by personal interviews in Korea and Japan, separately. The 40% and 68% respondents in Korean A and B universities, respectively, pointed out the energy issue as one of the serious environmental problems while the corresponding ratio among Japanese respondents was 44% and 34%. The participation intention for green campus movement in Japanese universities was higher than Korean universities. The 70% or 52% of Korean students in A and B universities, respectively, replied that they did not participate the green campus movement. It is needed to strengthen the educational program to achieve the sustainability of campus in Korea.
Stabilization technology of biogas plant applied recovery system
장병인(Jang, Byoungin),정미화(Jeoung, Mihwa),조윤미(Cho, Yoonmi),조용일(Jo, Yongil),박경호(Park, Kyungho) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
We are to evaluate the stabilization technology of actual biogas plant facilities, which is operating currently. It describes the traits of the consistent facilities of mesophilic anaerobic digestion using Unison Biogas plant Recovery system(UBR). Also the economical efficiency is examined with the electric power sales earnings and applying the deserted heating by generating electric power, which is generated by operated combined heat and power using biogas produced by mesophilic anaerobic digestion. We have generated the 481,113kw for electric power and 1,376Gcal for thermal energy simultaneously. If these electric power and thermal energy are converted into diesel, we can achieve savings equal to 114,300L, and 152,109L in the quantity of heat. Finally, if CDM, RPS, liquid fertilizer sales business, etc. is activated, the earnings will be expected to improve dramatically and is considered to contribute a drop of the greenhouse gas.
착화탄 연소에 의한 가스 중독 환자에서 혈중 중금속 농도의 영향에 대한 예비연구
이상환 ( Sang Hwan Lee ),이준철 ( Juncheol Lee ),조용일 ( Yongil Cho ),고벽성 ( Byuk Sung Ko ),오재훈 ( Jaehoon Oh ),강형구 ( Hyunggoo Kang ) 대한임상독성학회 2021 대한임상독성학회지 Vol.19 No.2
Purpose: It is known that the most common cause of gas poisoning in Korea is suicide attempts by burning ignition coals. Ignition coals are made from waste wood, and studies have been reported that heavy metals are emitted when this coal is burned. However, there was no study on how much heavy metal poisoning occurs in the human body through this, so this study was planned to find out whether the concentration of heavy metals in the blood increased in patients exposed to ignition coal combustion. Methods: From April 2020 to April 2021, blood lead, mercury, and cadmium concentrations were investigated in carbon monoxide poisoning patients who visited one regional emergency medical center in Seoul, and their association with exposure time, source of poisoning, and rhabdomyolysis were investigated. Results: During the study period, a total of 136 carbon monoxide poisoning patients were tested for heavy metals, and 81 cases of poisoning by ignition coal were reported. When comparing poisoning caused by combustion of ignition coal and other substances, there was no difference in the concentrations of lead, mercury, and cadmium in the blood, and there was no difference in the number of patients above the reference range. However, the patients exposed to more than 5 hours of ignition coal gas exposure are more frequent than those in the group less than 5 hours in lead (51.4% vs. 23.9%, p=0.012). Conclusion: Compared to poisoning with other combustible substances, the blood concentration of lead, mercury, and cadmium does not increase further in patients with gas poisoning by ignition coal. However, prolonged exposure may result in elevated levels of lead.