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연료 품질에 따른 증발가스 배출 및 고온과 실도로 조건에서의 차량 퍼지 특성 분석
길기현,이민호,임재혁,정진도 한국에너지학회 2023 에너지공학 Vol.32 No.4
자동차는 엔진 가동 시 발생되는 배출가스 중 미연탄화수소 (Hydrocarbons ; HCs) 외에도 엔진정지 시 주변 대기온도 영향으로 증발되어 배출되는 휘발성유기화합물질 (Volatile Organic Compound ; VOCs)인 증발가스 가 발생된다. 이러한 증발가스는 총탄화수소 (Total Hydro-carbons ; THC)와 같이 휘발유를 구성하는 물질 중 상대적으로 비점이 낮고 분자량이 작은 탄화수소 물질이다. 배기가스 THC와 증발가스가 지표면 오존량 증가에 영향을 미치는 것으로 밝혀짐에 따라 제작 자동차에 대한 증발가스 배출량 규제가 시작되었고 이에 대응하기 위한 증발가스 제어기술 (EVAP system) 들이 도입되었다. 본 연구에서는 가솔린 연료의 증기압에 따른 증발가 스 배출 특성을 확인하였으며, 친환경 자동차 (HEV, PHEV)의 캐니스터 (Canister) 퍼지량 특성을 기존 내연기 관 차량과 다양한 조건에서 비교·분석하였다. 이러한 결과를 통해 차량기술의 발전 필요성과 향후 친환경 연료 적용 가능성을 검토하는 자료로 활용하고자 하였다. In addition to unburned hydrocarbons in the exhaust gas generated during engine operation, automobiles generate volatile organic compounds generated by evaporation under the influence of ambient temperature when the engine is stopped. The evaporative gas emission is a hydrocarbon material having a relatively low boiling point and a small molecular weight among substances constituting gasoline, such as total hydrocarbons. As it was found that exhaust gas THC and evaporative gas emission increase the amount of ozone on the surface, regulations on evaporative gas emissions for manufactured cars began, and evaporative emission control technologies were developed to cope with this. In this study, the evaporative gas emission characteristics according to the vapour pressure of gasoline fuel were confirmed, and the canister purge volume characteristics of eco-friendly vehicles were compared and analyzed with existing internal combustion engine vehicles under various conditions. Through these results, it was intended to be used as data to review the need for development of vehicle technology and the possibility of applying eco-friendly fuel. in the future.
바이오중유 적용에 따른 선박용 엔진의 성능 및 배출가스, 부식 특성에 관한 연구
길기현,이민호,정진도 대한기계학회 2023 大韓機械學會論文集B Vol.47 No.1
As the interest on environment pollution has been gradually increasing at home and abroad, fuel and engine researchers have been working on the exhaust and greenhouse gas emission reduction from engines through several approaches such as new device design, innovative after-treatment systems for example, scrubber, SCR, and DPF, clean (eco-friendly alternative) fuel usage, and fuel quality improvement. In this study, the characteristics of performance, exhaust emissions, and metal corrosion when biofuel oils are used in marine engines was studied. Compared with heavy oils, biofuel oils have excellent environmental improvement effects such as reducing sulfur oxides, PM, Co, THC, and greenhouse gases in the exhaust gas. Therefore, biofuel oil must be reviewed as a marine and industrial alternative fuel to cope with the regulation of sulfur content, PM, and reduction of greenhouse gases. 국내·외에서 환경오염에 대한 관심은 급격히 증가하고 있으며, 연료 및 엔진 연구자들은 새로운 장치의 설계 및 획기적인 후처리장치(스크러버, SCR, DPF 등), 클린연료(친환경 대체연료), 연료 품질 개선 등 다양한 접근을 통해 엔진으로부터 배출가스나 온실가스를 줄이기 위해 노력하고 있다. 본 연구에서는, 바이오중유를 선박용 엔진에 사용하였을 때 성능 및 배출가스, 금속 부식 특성에 대해 연구를 진행하였다. 중유 대비 바이오중유는 배출가스에서 황산화물 및 입자상물질, 일산화탄소, 총탄화수소, 온실가스 등 훌륭한 환경 개선 효과를 보여주고 있다. 이러한 결과를 통해서, 황산화물 및 입자상물질(black carbon) 규제 및 온실가스 감축의 관점에서 선박 및 산업용 대체연료로서 바이오중유에 대한 검토가 필요하다고 할 수 있다.
길기현,김미란,김장흡,정연지,조현희 대한독성 유전단백체 학회 2016 Molecular & cellular toxicology Vol.12 No.4
The aim of this study is analyze the gene expression of the F2 mouse in comparison with the control mouse after exposure of F0 mouse to Di-ethyl hexyl phthalate (DEHP) via the parenteral route during the perinatal period. For this purpose, pregnant F0 mice were injected subcutaneously with corn oil (control group, n=3) or DEHP (treatment group, 30 μg/kg/day, n=3) during pregnancy and lactation. No further treatment was given after weaning of F1 mice. F1 mice were mated and delivered. Six F2 female mice from each group were randomly selected and total RNA was extracted from the ovaries. Microarrays were used to identify the genes and pathways affected by DEHP exposure. As a result, genes related with certain gynecological diseases showed significant changes in expressions. Genes, which were involved in MAPK signaling pathway, p53 signaling pathway, cell cycle, and oocyte maturation, showed significant changes in expression, too.
길기현 ( Ki Hyun Kil ),김남희 ( Nam Hee Kim ),허성은 ( Sung Eun Hur ),장병우 ( Byung Woo Jang ),이성기 ( Sung Ki Lee ),정청일 ( Chung Il Jung ) 대한산부인과학회 2008 Obstetrics & Gynecology Science Vol.51 No.11
Ruptured corpus luteum can cause massive hemorrhage. Because its symptoms are similar to those of ectopic pregnancy and/or acute appendicitis, its diagnose in early stage is not easy. When massive hemorrhage breaks out, it is reported that operational treatment is required. However, when accompanied with autoimmune disease such as systemic lupus erythematosus (SLE) along with stable vital signs, a conservative treatments such as corticosteroids and immunoglobulins can be carried out. A 23-year-old female presented with lower abdominal pain and diagnosed as intraperitoneal hemorrhage through ultrasonography and CT. Physical examination and laboratory findings also indicated that the patient was carrying systemic lupus erythematosus (SLE). We experienced a case of systemic lupus erythematosus with ruptured corpus lutem which treated with conservative treatments without complications and present it with brief review of literatures.
금은화(Flos lonicerae) 추출물의 Fischer 344/N 랫드를 이용한 90일간 반복 경구투여 독성시험
한충택,장호송,강상철,길기현,공광한,김도형,안태환,배진숙,고현규,한명규,김학수,허현숙,박은미,송시환,김갑호,박찬구,이현걸,Han, Zhong-Ze,Zhang, Hu-Song,Kang, Sang-Chul,Gil, Ki-Hyun,Kong, Kwang-Han,Kim, Do-Hyung,Ahn, Tae-Hwan,Bae, Jin-Sook,Go, Hyeon-Kyu,Ha 대한수의학회 2008 大韓獸醫學會誌 Vol.48 No.4
This study was performed to evaluate repeated-dose oral toxicities of Flos lonicerae extract in Fischer 344/n rats. Flos lonicerae was administered orally to rats at dose levels of 0, 37, 111, 333, 1,000 and 2,000 mg/kg/day. Each group consisted of 10 rats of each gender. The Flos lonicerae extract was given once a day, 5 times a week, for 90 day repeatedly. This study was conducted in accordance with the Protocol of Korea National Toxicology Program and The Standards of Toxicity Study for Medicinal Products. In the present study, there were no toxicologically significant changes in mortality, clinical signs, body weight gains, ophthalmoscopy, urine analysis, hematology, serum biochemistry, necropsy findings, organ weights, histopathology, estrus cycle and sperm examination of all animals treated with Flos lonicerae extract. These results suggest that the oral no observed adverse-effect level of the test item, Flos lonicerae extract, in rats is higher than 2,000 mg/kg/day in both genders. The target organs were not established.