http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
커먼 시스템에서 DME-LPG 혼합연료의 거시적 및 미시적 분무특성에 관한 연구
김웅일 ( Woong Il Kim ),김형익 ( Hyung Ik Kim ),우승철 ( Seung Chul Woo ),이창식 ( Chang Sik Lee ),이기형 ( Ki Hyung Lee ) 한국액체미립화학회 2014 한국액체미립화학회 학술강연회 논문집 Vol.2014 No.-
This study is to investigate the Macroscopic and Microscopic spray characteristics of DME-LPG blended fuels in common-rail system. The visualization experiment was performed to analyze the macroscopic spray characteristics of test fuels. In addition, In order to compare liquid phase and gas phase, the experiment using BOS method is performed. Spray tip penetration, spray cone angle and spray area were measured. SMD and spray particle velocity were measured using the PDPA system to analyze the microscopic properties of test fuels. The results of this experiment showed that spray tip penetration, spray cone angle and spray area of DMELPG fuels are similar to those of DME fuel. When compared to results of experiment using BOS, significant differences of spray tip penetrations, spray cone angle and spray area are showed because of gas phase. SMD of DME-LPG blended fuels is smaller than that of DME fuel. Velocity of DME-LPG blended fuels is faster than that of DME fuel.
연료분무 및 연소 3 : 커먼레일 시스템에서 바이오디젤과 바이오디젤 혼합 디젤연료의 분사 및 분무특성
김웅일 ( Woong Il Kim ),이동곤 ( Dong Gon Lee ),이창식 ( Chang Sik Lee ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
The purpose of this study is to investigate the spray characteristics and visualization of spray behaviors of biodiesel (KB100) compare to blended fuel (KB50) and diesel. The experiments for spray characteristics are conducted on the injection mass, injection rate, spray visualization and macroscopic characteristics. In this work, injection rate experiment was performed for same injection mass by using Bosch method and spray characteristics such as spray tip penetration, spray cone angle and spray area were measured from the taken spray images. Spray development processes are carried out using high speed camera and visualized spray chamber. Spray tip penetration, spray cone angle and spray area were measured in the taken spray images. The experiment was performed by a common rail type high-pressure injector for diesel engines. In the same injection mass and 50MPa of injection pressure, the experimental results showed that biodiesel (KB100) indicated longest injection duration and lowest injection rate compared to those of KB50 and conventional diesel fuel. In the case of higher injection pressure 150MPa, the injection rate of undiluted biodiesel showed the shortest injection duration and highest injection rate for same injection mass compared to those of KB50 and diesel fuel. The results of visualization experiment show that spray tip penetration and spray area are increased with increasing injection pressure. With increasing ambient pressure, spray tip penetration decreased, and spray cone angle and spray area is increased. The pure biodiesel showed the highest spray tip penetration and lowest spray cone angle than those of blended fuel with 50% blending ratio and diesel, because of higher fuel density and viscosity.
양수진(Su-Jin Yang),김선영(Sun-Young Kim),김웅장(Woong-Jang Kim),김향화(Hyang-Wha Kim),김재민(Jae-Min Kim),김성완(Sung-Wan Kim),신일선(Il-Seon Shin),윤진상(Jin-Sang Yoon) 대한소아청소년정신의학회 2008 소아청소년정신의학 Vol.19 No.1
Objectives : This study aimed to examine current educational experiences, knowledge, intention to report, and requests for child abuse education in medical interns. Methods : A descriptive cross-sectional study was conducted in 2006 and 2007. The study sample consisted of 193 medical interns who served their internships at the university hospital. They answered 11 self-administered questionnaires related to child abuse. Results : Although respondents indicated a strong will to assist in eradicating abuse of children, about 90% had no educational experiences and knowledge of child abuse. Ignorance was a major factor for low reported cases of abused children. The preferred nominated reporting agency for child abuse was the National Child Protection Agency in 47.9% of female respondents, while 48.3% of males nominated Police Stations as their preferred option. In relation to sexual abuse, Police Stations were the preferred reporting agency by 49.2% of males and 37.0% of females. Medical school curricula were chosen by the majority of interns as the most appropriate stage where child abuse education should be introduced. Conclusion : This study found that medical graduates had limited experience and knowledge related to child abuse. The medical school curricula for child abuse needs to be further developed, implemented, and evaluated when appropriate.
에탄올/가솔린 혼합연료의 물리적 특성에 따른 분무 특성 비교
김웅일,김영근,이황복,이기형,Kim, Woong Il,Kim, Youngkun,Lee, Hwang Bok,Lee, Kihyung 한국액체미립화학회 2017 한국액체미립화학회지 Vol.22 No.3
The aim of this study is to investigate the effect of physical properties of fuels on spray characteristics in the gasoline direct injection system. Injection rate, spray visualization, and spray pattern experiments were performed to analyze the spray characteristics of ethanol, gasoline, and ethanol/gasoline blends. We measured injection rate of each fuel via the Bosch method. The spray visualization experiment was also carried out at atmospheric pressure using a high-speed camera. Finally, the average of drop surface area per unit volume was measured using the optical patternator. The experimental results from Bosch method showed that peak injection rate increased when the volume fraction of ethanol increased. In addition, higher viscosity of ethanol than that of gasoline leads to longer injection delay. At the initial injection region before reaching 0.8 ms, the spray tip penetration becomes longer as increasing the volume fraction of ethanol, but reversely shorter after 0.8 ms. It was found that ethanol makes spray angle become larger. The surface area per unit volume of the drop was decreased as the distance from the injection tip or the concentration of the gasoline increased.
고령화와 연관된 인지감퇴에 대한 혈관성 위험인자의 영향
신일선(Il-Seon Shin),김재민(Jae-Min Kim),김웅장(Woong-Jang Kim),최성구(Sung-Ku Choi),윤진상(Jin-Sang Yoon) 대한노인정신의학회 2002 노인정신의학 Vol.6 No.1
목 적: 본 연구에서는 인지감퇴와 고령화 간의 연관성, 그리고 그 연관성에 미치는 혈관성 위험인자(고혈압과 당뇨병) 의 영향을 조사하고자 하였다. 방 법: 65세 이상 노인 1134명이 1999년에 한국판 간이정신상태검사(Korean version of Mini-Mental State Examination;MMSE-K)로 평가를 받았고, 이들 중 686명(61%)이 2년 후에 MMSE-K로 재평가를 받았다. 연령과 혈관성 위험인자(고혈압과 당뇨병)에 대한 자료를 수집하였다. 결 과: 인지감퇴는 고령화와 유의한 연관성이 있었다. 층화분석에서, 인지감퇴와 고령화 간의 연관성은 혈관성 위험인자가 있는 경우 유의하였으나, 혈관성 위험인자가 없는 경우에는 유의하지 않았다. 결 론: 혈관성 위험인자에 대한 적절한 조절을 통해 고령화와 연관된 인지감퇴를 지연시킬 수 있음을 시사한다. Objective:This study aimed to investigate the association between cognitive decline and advancing age, and the potential effects of vascular risk factors on the associations. Method:1134 old persons aged 65 or over was assessed by the Korean version of Mini-Mental State Examination (MMSE-K) in 1999, and after two years 686 (61%) of the total subjects were reassessed with MMSE-K. Data on age and vascular risk factors (hypertension and diabetes) was obtained. Results:Cognitive decline was significantly associated with advancing age. The stratified analyses showed that the association of cognitive decline with advancing age was significant for those with vascular risk factors, but not significant for the subjects without vascular risk factors. Conclusion:We suggest that the cognitive decline with advancing age might be delayed by appropriate management for the vascular risk factors.
신홍철,김웅각,강정일,Shin, Hong-Cheul,Kim, Woong-Gak,Kang, Jeong-Il 대한물리치료과학회 2001 대한물리치료과학회지 Vol.8 No.2
This study is approached the early intervention of children with disability in the aspect of family. The family of didabled children are identified as special individual with responsibilities and roles beyond those of other family. Physical Therapy need of the disabled child should be sought in the context of the family and socio-cultural environment. The process of early developmental facilitation is defined as a approach of the family. As family is the most influential factor in the child developmental facilitation, treatment and education. The family tend to seek complete information about disabilities, desire accurate, straight foreward about their child.