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Dump 소각기에서 CCl_(4) 분해에 대한 수치해석
채종성,엄태인,전영남,문승현 한밭대학교 생산융합기술연구소 2004 생산기반기술연구소 논문집 Vol.4 No.1
A major source of the hazardous waste generated is from chemical industries producing plastics, herbicides, pesticides and chlorinated solvents. All of these processes produce a class of hazardous waste termed the chlorinated hydrocarbons (CHCs), either directly or from undesirable side reactions. In this study, the destruction characteristics of hazardous waste through incineration is investigated by the development of a reliable computer program. Especially a nonequilibrium combustion model was used to describe the effect of the chemical kinetics due to the flame inhibition characteristics of CCl_(4) which was used as the surrogate of hazardous waste.
프라이버시 침해 방지 기능을 갖는 키 복구 시스템에 관한 연구
채승철,이임영 순천향대학교 부설 산업기술연구소 1998 순천향 산업기술연구소논문집 Vol.4 No.2
A properly designed cryptosystem makes impossible to recover encrypted data without knowledge of the correct key. In some cases, this property creates a potential problem for users of encryption themselves - risk of data loss, threat by crime. A technique which recover the key from encrypted data, as known as key recovery, can provide the solutions to above problems. In this paper, we proposed key recovery system with protecting user's privacy. In this system, No one can obtain illegally the secret key of users and law-enforcement always can obtain secret key with time-bound.
채진욱,김일희,권우성,이근미,정승필,문용 영남대학교 의과대학 2003 Yeungnam University Journal of Medicine Vol.20 No.1
Background: Body weight is an important factor that influence the bone density in postmenopausal women except estrogen dificiency. However, different results are reported about the relationship between body composition and bone density in the postmenopausal women. We have studied the relationship between age, body weight, body mass index (BMI), waist hip ratio (WHR), muscle mass, fat mass, fat free mass and bone density. Materials and Methods: We have studied 127 persons of postmenopausal women who visited university medical center and examined the inbody 3.0 and Dual Energy X-ray Absorptiometry (DEXA) from Jan, 2001 to Jun, 2002. they didn't have any disease and didn't received homone therapy, osteoprosis therapy or other medication that influence the bone density. Results: The numbers of study subjects is total 127 persons. Mean age is 56.9±5.14, mean weight is 59.3±8.7 kg, mean BMI is 25.37±3.16 (kg/㎡), mean fat mass is 20.02±5.05 kg, mean muscle mass is 37.49±4.50 kg, mean fat free mass is 39.80±4.70, mean BMD is 0.828±0.148 (g/㎠). In the result of linear regression analysis, age, height, weight, muscle mass, fat free mass, fat mass, BMI are significant determinants of BMD. In stepwise multiple regression analysis, age is the most significant determinant of BMD and besides age, fat mass is the most significant determinant of BMD among body composition. Conclusion: In postmenopausal women, age, height, weight, BMI, muscle mass, fat free mass, fat mass are significant determinants of BMD and besides age, fat free mass is the most significant determinant of BMD among the body composition. So, diet and exercise that increase fat free mass will contribute to bone density increment.
인천지역 한 대학병원에서 진단된 기관지천식 중 직업관련성 천식
채창호,진영우,김은아,최승원,강성규,최용휴 大韓産業醫學會 1999 대한직업환경의학회지 Vol.11 No.2
Bronchial Asthma could be developed by occupational origin. 4-16% of bronchial asthmas are known to be related to occupational exposure. However, occupational asthma has not been reported from the periodic occupational health examination, but reported through case report from clinicians. The authors analysed hospital records to find out work-related bronchial asthma and their occupational characteristics at a university hospital in Inchon. All records which were confirmed as bronchial asthma in adult by an allegist from June, 1996 to May, 1998 were selected. Through record reviewing, any suspected work related asthma was selected and the inteview was done by phone or at the out-patient clinic. The possible cases were confirmed by additional tests including specific bronchial provocation test. Sixteen(3.9%) out of 411 bronchial asthma were confirmed as work-related asthma. Eight cases out of 16 worked at furniture industry, three worked at dye manufacturing and two worked at musical instrument manufacturing industry. Others worked at farm and machinary industry. The confirmed asthmogen were toluene diisocyante(8), reactive dye(3), and grain dust(1). None of the cases was detected as work-related asthma in the periodic health examination. Twelve out of sixteen occupational asthma patients discontinued their work. The results suggested that many patients with occupational asthma were not reported and the periodic health examination was not an effective system for detecting the workrelated asthma. Thus setting up the surveillance system involving allergist or pulmonologist would be important to detect and prevent occupational asthma.
Trichloroethylen의 직업적 노출에 의한 독성간염 및 박탈성 피부염 1례
채홍재,이성관,이강진,김종율,이승철,신동현,문재동 大韓産業醫學會 2003 대한직업환경의학회지 Vol.15 No.1
28세 남자가 trichloroethylene을 이용한 세척 및 탈지작업에 종사한지 한 달만에 발열, 오한 및 홍반을 동반한 피부발진 등의 증상이 발현되었다. 황달을 동반한 간기능 부전의 소견을 보였으며 피부는 박탈되었다. 부신피질호르몬, 항히스타민제 및 간기능 보조제를 이용한 치료로 간기능 및 피부 병변은 호전되었다. 검사소견상 Ig E가 상승되었고 trichloroethylene에 의한 과민반응으로 추정되었다. Trichloroethylene을 사용하는 소규모 사업장에서의 노출억제 방안을 포함한 보건관리가 요구되며 특수건강진단 주기에 대한 변경이 필요하리라 사료된다. A 28-year-old male began working as a degreaser. The solvent used in the degreasing operation was trichloroethylene. Over the next month the man experienced fever, chills, and an erythematous skin rash and itching. At that time he had a marked elevation in his liver enzyme, with cholestasis. Over the next few days the rash persisted then peeled. There was an elevation of Ig E, and a positive patch test reaction to trichloroethylene. His dermatitis and hepatitis were considered to be mediated by a hypersensitivity mechanism.
학교문화예술교육의 교수 : 학습체계 구축을 위한 구성주의 학습이론 탐색
채승희 신라대학교 (부산여자대학교) 2013 예술연구 Vol.18 No.-
The purpose of this study is to examine the goals and practice patterns of school education of culture and arts, and based on elements and structures of educational technology of school, explore the significance and the process of designing a teaching-learning system which is a basic course for classes. Lastly, this paper discusses what the constructivist learning theory, among learning theories underlying public education, can contribute to establishing a learning system of school education of culture and arts. The significance of this study could be found in that is could help to draw the advantages of maintaining consistency of public education by striking a balance with existing learning systems, providing basis for collaboration between teachers ad art lecturers, and reducing the process for establishing of a teaching-learning system.
채희백,이수빈,홍진수,김승우 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.2
Nd-Yag pulsed laser(210mJ, 6ns) was focused on polymer to make craters in an atmosphere. The size of the crater has a trend to follow the ideal estimation. Laser-firing near the focal point in air could be an energy dissipation of laser and a possible cause of the crater size reduction. Multiple plasma image and normal eruption of the plasma was also studied with photographs.
채희창,강희용,유상훈,이승현,문홍렬 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.2
Nowadays, as the development period of new products becomes shorter and consumer's requirement is more various, the importance of Rapid Prototyping Technology has been rapidly increased. Rapid Prototyping makes prototypes or functional parts directly using the 3D CAD data. But RP machines can make protypes in limit size. For making large size prototype, we slice solid, which is made of STL file, and then glue sliced solid. And if contact area of part is small, union solid will be easily destroyed for going down of adhesion. So we need to expand contact area, I suggest making a section into stair shape. This paper is concerned with slicing solid on STL file and improving on adhesion.
채승철,이임영 순천향대학교 부설 산업기술연구소 1998 순천향 산업기술연구소논문집 Vol.4 No.2
One of the most important part in a cryptosystem is a key information. The key information and orignal message fundamentally keep the same value. If the key is damaged, it is able to cause all information to lose. Besides, another possible problem is that a dishonest internal user in a company could steal or destroy secret files by using a encryption system. In this paper, we proposed cyrptosystem that is able to offer key recovery in a emergency condition, and mechanism that is able to protect possible attack in the key recovery system.