Piezocone과 Rowe Cell을 利用한 水平壓密係數 推定

권기복,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.1

Site characterization is one of the most important performances in projects with regard to solving geotechnical problems. Piezocone penetration test is a fast, economic, and accurate method of site characterization. Static cone penetrometer and the piezocone represents the most versatile tools currently available for soil exploration. The cone penetration and piezocone tests provide continuous sounding capability and repeatability. Rare of consolidation parameter may be assessed form the Piezocone test by measuring the dissipation or decay of pore pressure with time after a stop in penetration. And many researches have been developed to determine the horizontal coefficent of consolidation from the Piezocone test. Many of these researches using a theoretical solutions which is determined from either the cavity expantion theory or the stress path method. However, depending on assumptions and analytical techniques, the results can be varied considerably. For that reason, many researchers make their effort to improve and complement the defect of already established methods. In this dissertation, the correlation between the Coefficient of Consolidation from Piezocone dissipation test and the Coefficient of Consolidation Rowe Cell horizontal consolidation test in many cases was studied. The purpose of this study is to know the changing of the Coefficient of Consolidation by loading condition while Rowe Cell horizontal consolidation test is used

농촌지역의 생활폐기물 발생 특성 : 경북지역을 중심으로 Detailed Kyeongbuk Area

권기홍,조병락,전영국 영남이공대학 산업기술연구소 2003 産業技術硏究 Vol.15 No.-

This study was carried out to investigate the generation and physico-chemical composition of solid wastes in the Kyeongbuk area. As a result, the generation rate of municipal solid wastes(MSWs) in the Kyeongbuk area have been lower('96 : 43,757ton/day → '01 : 42,384ton/day), but recyclable wastes of them have been higher ('96 : 10,592ton/day →'01 : 12,828ton/day). The annual generation rate of MSWs in the country was 0.96kg in 1996, 0.92kg in 2001, respectively, it has maintained below 1.0kg, but it was 1.03kg in 1996, 0.94kg in 2001 in Kyeangbuk area, respectively. In MSWs, food wastes in the country and the Kyeongbuk area are 8,510kg and 493kg, and separation rate of food waste are 37.8% and 59.4%, respectively. Totally the generation rate of MSWs was decreased, but recyclable products of MSWs was increased. Three components, heating value, elements analysis in 2001 was similer to 1996's results.

중대산업사고 예방을 위한 종합위험관리체제(IRMS) 구축에 관한 연구

권혁면,성대현,김재현,임대식,김기영,편무욱,문일,고재욱,이영순,윤인섭 한국안전학회 2003 한국안전학회지 Vol.18 No.3

The Process Safety Management (PSM) by the Law of Industry, Safety and Health has been performed for preventing major accidents of chemical plants since 1996. In terms of preventing chemical accidents more precisely, it is essential to develop a tool for quantitative risk assessment. For this, KOSHA (Korea Occupational Safety and Health Agency) developed an Integrated Risk Management System (IRMS) . The system is designed to assimilate data on chemical plant hazards from external database, to integrate these data with location information (topographic and demographic), and to make them user-friendly accessible. The system consists of several main functions: display of five major Korean petrochemical complex layout, display of equipment layout with its information utilizing the external database, zonation of the hazard effected area with consequence analyses, the most probable accident scenario generation, accident/incident database and calculation of frequency of accident using equipment reliability database, etc. The highlight of IRMS is to provide the risk contours using GIS(Geographical Information System) technology. IRMS is intended to manage hazardous installation more systematically and effectively, to reduce the number of accident remarkably, further minimizing production loss in the plant. The system is now under application to about 500 PSM sites as well as and emergency authorities in Korea by KOSHA (Korea Occupational Safety and Health Agency)

복식에 나타난 양성성의 상징적 의미 연구

권기영 服飾文化學會 2002 服飾文化硏究 Vol.10 No.6

The purpose of this study is to observe the symbolic meaning and the values of the costume which express bisexuality through the definition from a culture point of view. The research method is to contemplate the documentary records such as world history. art history and clothing history. and to recognize the symbolic meaning of a bisexuality in modern fashion design. A definition the word 'man and woman' restricted the human being for a long time. This restrict is enforced by the costume, but this traditional fixed idea is retarded by the liberal sense of the human being and the design expresses a sex ambiguity This study insects the sex ambiguity and the meaning of that through a cultural background and a historical costume. The results are as follows The fist, the cultural background about bisexuality is classified into the etymological point. the mythplogic point. the art and philosophical point. the political and economic background, the mass media, and the custome and the regulation. A bisexuality is a concept in existence from ancient times. we have an open-minded attitude about bisexuality in the present than the past. The second. the function of costume is sex classification before 20th century. but since 20th century the costume expresses sex ambiguity. The third. the symbols of the bisexuaity are the interminancy. the unity and the dismantling. The costume which expresses bisexuality means coexistence of male sex and female sex. this is a kind of motion to embody a idea; body of the human being. This study makes a contribution to recognize the dignity of human body and to understand the phenomenon of modern society.

광촉매를 이용한 셀룰로오스섬유의 기능화에 관한 연구 : 항균·소취성 및 자외선 차폐성을 중심으로 Focusing on Antibacterial activity, Deodorization & UV cut ability

권오경,문제기,손부헌,최영희 한국의류산업학회 2003 한국의류산업학회지 Vol.5 No.4

In this study, we measured the antibacterial activities, deodorization, UV cut ability, whiteness and SEM, according to the size(5 μm, 15 ?m) of ThiO₂, concentration(3%, 5%, 10%) and dipping temperature(50℃, 70℃) with using anatase type of TiO₂ photocatalyst. Photocatalyst is the substance which carries out functions, such as decomposition, removal, deodorization, antibacterial, etc. of a contaminant, in a place with light based on an oxidation-reduction reaction. The results of this study were as follow. Antibacterial activities are increased with increasing of the TiO₂'s concentration, and TiO₂ has high antibacterial activities for Staphylococcus aureus but it has low antibacterial activities for Klebsiella pneumoniae. The deodorization and UV cut ability is very good, therefore be able to get good effects with usingonly 3% of TiO₂. Every effects are increased by using small size of TiO₂ and high dipping temperature.

전경대원에서 발생한 결핵의 임상 양상

문창기,박상준,조민구,김영중,김소연,김윤권,정준오,안석진,김은실,서승오,김지훈,최원제,이윤영,박형기,최규영,김현근 대한감염학회 2006 감염과 화학요법 Vol.38 No.6

Background: The purpose of this study was to document the incidence and clinical characteristics of patients with tuberculosis (TB) in combat and auxiliary police, living in a group, in Korea where the incidence rate of active TB in a general population is higher than in Western countries. Materials and Methods:We retrospectively reviewed the medical records of all tuberculosis patients diagnosed at National Police Hospital from January 2002 through December 2004. Results:In 2002-2004, a total of 156 cases of tuberculosis were identified with the mean (Standard deviation) age of 20.6 (±1.0) years. Of these, 134 (85.9%) patients were registered as new cases, 11 (7.1%) as relapse, 2 (1.3%) as failure, 5 (3.1%) as treatment-after-default cases whereas 4 (2.6 %) patients were not included in any categories. Average annual new TB rate and smear-positive TB rate were 86.5/10^(5) and 17.4/10^(5) person-years, respectively. In 12 of 31 smear-positive cases, time from onset of symptoms to diagnosis was more than 30 days. Two multidrug-resistance TB cases were identified and two suspected outbreak episodes of TB had occurred during 3 years. Conclusion:There was no statistically significant difference in the incidence rate of new cases of TB between the general population aged 20 to 29 years and combat and auxiliary police in Korea. 배경 : 국내 결핵의 발생은 감소 추세에 있으나 여전히 후진국형 발생양상을 보이고 있다. 특히 집단생활을 하는 젊은이들에서 발생하는 결핵의 유행이 간헐적으로 알려지고 있어 우려를 낳고 있다. 이에 저자들은 최근 전경대원의 결핵 발병 양상에 대해 알아보고자 본 연구를 시행하였다. 재료 및 방법 : 2002년 1월부터 2004년 12월까지 3년간 경찰병원에서 결핵 진료를 받은 전경대원의 의무기록을 후향적으로 분석하여 연도별 결핵 신환발생률, 도말양성결핵 신환율, 진단 지연, 집단발병, 다제내성결핵을 조사하였다. 결과 : 연도별 결핵 신환자 수(10만명당 발생추정치)는 2002년 50명(83.6명), 2003년 42명(83.7명), 2004년 42명(93.5명)이었고 도말양성 폐결핵 신환자 수는 2002년 10명(16.7명), 2003년 11명(21.9명), 2004년 6명(13.4명)이었다. 3년간 도말양성 폐결핵 환자는 31명이 있었고 그 중 12명은 호흡기 증상 발생 30일이 지나서 진단을 받았다. 다제내성 결핵은 2명이 있었으며 결핵의 집단발병이 의심되는 사례는 2차례 있었다. 결론 : 전경대원과 20-29세 연령군 일반인의 결핵 신환발생률, 도말양성 폐결핵 발생률의 통계적으로 유의한 차이는 없었다.

일부 세탁소의 유기용제 관리실태 및 공기중 노출농도에 관한 조사

노영만,권기범,박승현,정지연 한국산업위생학회 2001 한국산업보건학회지 Vol.11 No.1

This study was conducted to identify the current status of occupational safety and health by checklist and to evaluate the airborne exposure to chemicals and to provide the appropriate recommendation for safety and health of laundries. A total of 20 laundries located in the Gyungi district area were surveyed from July 20 to September 15, 2000. The prevalence of laundries having a stove and gas range were found to be 25 % and 55 %, respectively. Smoking is not allowed in 60 % of the laundries. Only 10 % of dry-cleaners were isolated. Ventilation system in laundries had not been annually inspected. Most of the workers didn't put on respirators, MSDS were not available, and storage bottles did not contain warning labels. The bulk samples of dry cleaning agent include many chemicals that are not controlled by the MOL in Korea. The detected airborne organic solvents in the laundries were benzene, toluene, p-xylene, m-xylene, o-xylene, perchloroethylene, and 2-butoxy ethanol. The airborne concentrations of organic solvents were much less than the occupational exposure limits proposed by the Ministry of Labor(MOL) in Korea. But the concentrations of benzene exceeded the TLV of ACGIH. This study showed that the current status of occupational safety and health was not appropriate for workers in laundries. It is recommended that laundry workers should be educated for the treatment and storage of hazardous organic solvents to improve the occupational safety and health of the working environment as well as MSDS usage. Also, extended research and survey for the organic solvents that are not controlled by the MOL has to be conducted.

하수 염소 소독시 소독부산물 발생 특성

백영석,송민형,정경훈,권동식,이기공 한국물환경학회 2004 한국물환경학회지 Vol.20 No.3

This study was performed to investigate the disinfection efficiency and the formation characteristics of disinfection by-products(DBPs) by chlorination in the sewage effluent. The effluent was sampled from the sewage treatment plants operated in the activated sludge process and the advanced sewage process. The type of DBPs investigated were Trihalomethanes(THMs), Dichloroacetonitrile(DCAN), Chloral hydrate(CH), Dichloroacetic acid(DCAA), Trichloroacetic acid(TCAA). Major findings are as follows. First, the optimum injection concentration for chlorination in sewage effluent were found to be in the range 0.5 ~ 1.0 ㎎ Cl₂/L. Also, It was found that the chlorine dosage in the effluent of activated sludge process was higher than in the effluent of advanced sewage process. Second, the maximum formation concentration of THMs were 12.7 μg/L. The THMs formation reaction was finished in a short time of several seconds and chloroform was mainly formed. Also, it was found that the concentration of ammonium nitrogen is higher, the concentration of THMs is lower. Third, it was found that DCAA and TCAA were mainly formed as DBPs by disinfection.

생활폐기물의 배출원별 발생량 및 질적 특성

박종웅,권기홍,박상철,유호원,이학영 경산대학교(대구한의과대학) 1998 環境硏究 Vol.3 No.1

This study aims to investigate generation and physicochemical characteristics of Municipal Solid Wastes(MSW) generated from different sources in Kyungju. The source are apartments(low, high-rise), single family houses(centra1, outer), traditional market, office(city hall), factory, school, Park. The unit waste discharge rate of residential MSW excluding recyclable solid wastes was 0.47 kg/(capita . day). The maximum coefficients of variation for month and season were 1.23, 1.17, respectively. The bulk density of solid wastes was largely different for each sampling site, and the bulk densities of apartment district, single family house district and public area were 232㎏/m, 247kg/m, 170kg/m, respectively. The load factory of vehicle was 457kg/m. The percentage of combustible material to solid wastes was 86.5%. The physical compositions of solid wastes were food of 36.2%, Paper of 32.3%, plastic of 11.9%, glass of 6.5%, metal of 4.6%, textile of 3.0%, rubber of 1.8% and wood of 1.3%. The proximate analysis results of solid wastes showed moisture of 45.7%, volatile solids of 45.2%, and ash of 9.1%. In case of moisture content, the maximum value showed 66.7% in high-rise apartment district and the minimum value 14.0% in school district. Carbon, hydrogen, oxygen, nitrogen, sulfur and chlorine contents of combustible solid wastes were 48.4%, 7.0%, 25.9%, 1.3%, 0.2% and 0.4%, respectively. The low heating values of combustible solid wastes were 1,365 ~ 2,896kca1/kg (average 1,892kca1/kg) in residential area and 1,200∼3,878kca1/kg (average 2,178kca1/kg) in public area. Especially, the generation rate and the moisture content of residential MSW separating food wastes decreased 2.7 and 1.7 times and the low heating increased 2.1 times in apartment district.

하부팽창형 임프란트의 유한요소 분석 및 골형성에 대한 연구

한석환,김영규,민경기,조완석,권종진 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.3

The aim of this study was to evaluate by finite element analysis influence of investigated expanding implant on stress distribution and to observe biocompatibility, bone formation feature and change in the bone contact area around the explanding implant through experimental animal study. FEA models of the mandible were constructed based on three-dimensional graphic data of the bone structure around an osseointegrated implant, analysis of stress distribution followed by 100N vertical, 50N horizontal was done. And in the animal study, expanding implant were placed in the mandibles of eight Korean mongrel dogs and analyzed the results with histomorphometric measurements. In finite element analysis, compressive stresses are produced at the bone tissue surrounding the implant, and the contact area between the implant and the bone tissue is increased, which result in increased resistance to horizontal and vertical pressure loads. In the histomorphometric analysis, the measured ratio of the contact surface and bon density between implant and bone was similar to those of the controlled group from 6 weeks. It is thought that increased horizontal and vertical resistance is a great help to the immediate loading on expanding implant and that there needs standardizing quantitative measurement of implant stability and osseointegration to determine whether or not to use the functional loading and to reduce the total treatment period reliably by placing functional loading on each implant based on both bone quality and implant stability.