부직포활성슬러지법에 의한 하수와 침출수처리에 관한 기초연구

정유진,고현웅,김경순,윤태경,성낙창 한국환경과학회 2003 한국환경과학회지 Vol.12 No.10

In this study, it was performed using submerged nonwoven bioreactor(SNBR) for removal of organic matter, nitrogen and phosphate under different aeration intervals(intermittent aeration). We applied the SNBR at the cheap nonwoven fiber module instead of the expensive membrane. The SNBR was mainly made up of an activated sludge reactor and a transverse flow nonwoven module. with an innovative configuration being in application between them. In case of sewage, the aeration conditions experimented consist of continuous aeration and 60min/60min, 120min/60min, 120min/120min of aeration/nonaeration time intervals, respectively. In case of landfill leachate, the intermittent aeration condition was 120min/120min at aeration/nonaeration. Consequently. a high COD removal rate (about 94%) was achieved in sewage and leachate. Although nutrient removal rate was relatively high without any additional chemicals.

네일 디자인의 표현기법과 작품제작에 관한 연구

정해량,고정민,안현순 한국패션뷰티학회 2008 한국패션뷰티학회지 Vol.6 No.1

This study focused on the expression technique and work manufacturing of nail design. Any woman that wants to be pretty is interested in nail design which is considered as a means to express beauty, intelligence and sensuality. These days, nail design carries heavy weight in completion of total fashion coordination. Good dress, elegant hair style, bright make-up and well-trimmed nails are requirements of modern women. These days, the range of nail design is more expanding and its importance is getting bigger. To maintain and establish such developmental flow properly, we have to break our stereotyped view on nails and accept it in open view. And we have to actively participate in development of new products and technologies and perform academic research on nail design. For the purpose, we have to consider further studies which contribute to understanding exact meaning of nails and necessity and importance of nails.

SF6/N₂압축가스중에서 支持絶綠物의 沿面放電 特性

李鉉雨,高義石,金正達 慶南大學校 附設 工業技術硏究所 1987 硏究論文集 Vol.5 No.-

直流 平等電界중에서 電氣的 負性氣體인 SF?가스와 N₂가스를 混合시킨 경우 破壤電壓과 PMMA 스페이서가 존재하는 경우 沿面放電特性을 760〔torr·cm〕이하에서 조사 검토한 結果를 要約하면 다음과 같다. 1. SF?, N₂,SF?/N₂가스 混合가스중에서 스페이서가 없는 直流平等電界의 破壤强度는 파센곡선에 따랐으며 電極과 스페이서의 接觸狀態가 完全한 경우도 거의 직선적으로 증가했다. 2. 스페이서가 없는 경우와 스페이서와 電極이 完全한 경우는 가스 種類에 관계없이 極性效果는 나타나지 않고 電極과 스페이서간에 接觸缺陷이 있는 경우 負極性 閃絡電壓은 正極性의 경우보다 낮았다. 3. pd≥500〔torr·cm〕범위에서는 스페이서 效率이 낮게 나타나고 pd?200〔torr·cm〕범위에서는 閃絡電壓이 가스壓에 依存한다. 4. SF?30〔%〕N₂70〔%〕混合가스의 경우 N₂단독가스와 비교해 볼 때 약 2.2배의 絶綠强度를 나타내므로 N₂가스에 소량의 SF? 가스를 混合하여도 閃絡電壓은 매우 높게 된다. Surface Breakdown Characteristics of Spacer in SF?/N ₂Compressed Gas. The flashover voltages have been investigated for PMMA spacer and unbridged-gap in SF?/N₂gas mixtures up to the value of 760(torr·cm), The gap was stressed by DC source The results obtained are as follow; 1. The flashover voltages for an unbridged gap and for a spacer in SF?/N₂gas mixtures follow the Paschen's curve. 2. The polarity effects was not observed in both unbridged gap and a spacer which had perfect contacts with an electrodes. The flashover voltages for negative polarity are lower than those for positive polarity in case of imperfect contacts. 3. 3% flashover voltages is decreased by the putting a spacer which had perfect contacts with an electrodes. The spacer which has gap void shows the lowest flashover voltages. 4. The lowest spacer efficiency was obtained with higher gas pressure & large amount of N₂content. The flashover voltages depend on the gas pressure rather than the spacer efficiency at low valuse of pd. 5. The flashover voltage of gas mixtures of N₂with SF? are relatively high, even though the amount of SF? gas content is small.

변압기의 유동대전에 대한 유속 및 유온의 영향에 관한 연구

정원용,고희석,박상현,박재윤,김정달 慶南大學校 附設 工業技術硏究所 1992 硏究論文集 Vol.10 No.-

本 硏究에서는 固體-液體 界面에서 液體가 流動할 때 발생되는 유동대전에 대한 硏究로서 大容量 變壓器내에서 絶緣油가 통과하는 通路를 모델링한 帶電 파이프를 設計·製作하고 대전 파이프내의 油路形狀에 따른 流動電流를 側定·分析하였다. 이러한 實驗으로부터 얻은 결과는 다음과 같다. 1) 流動電流는 油速의 增加에 따라 線形的으로 增加하였으며, 油溫의 增加에 따라 약 46[℃]이하에서는 增加하고 그 이상에서는 感少한다. 2) 絶緣油의 흐름이 원활하게 되도록 油路形狀을 변화시키면 流動電流는 感少한다. In this paper, the streaming electrification generated at a solid-liquid interface is studied. Electrification pipe modeled on the oil path of the high power transformer is designed and manufactured. The Streaming current is measured as a function of oil velosity, temperature at each electrification pipe. From the result of this study the following conclusions are obtained. 1) The streaming current increases linearly with increasing of oil velocity and It increases at lower temperature than 46[℃]and decreases at higher temperature than 46[℃] 2) The smoother the flow of insulating oil is the less the streaming current decreases.

피로와 의료이용, 업무상 사고 및 질병결근

장세진,고상백,강동묵,김성아,정진주,이철갑,강명근,현숙정,조정진,차봉석,박종구 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Objectives: This study examined the relationship of fatigue to medical utilization, occupational accident and sickness absence. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project, 2002~2004). A total of 30,146 employees categorized within the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were recruited. A structured-questionnaire was used to assess the participants' sociodemo-graphics, job-related factors, health-related behaviors, personality trait, self=perceived fatigue (MFS) and the frequency of medical utilization, occupational accident and sickness absence. Data on medical utilization and occupational accident were confirmed from company health records. Chi-square test and logistic regression analysis were used to elucidate the relationship of self-perceived fatigue to medical utilization, occupational accident and sickness absence. Results: In logistic regression analyses, self-perceived fatigue was associated with medical utilization (outpatient), occupational accident and sickness absence although the strength of the associations was higher in the blue collar workers except for medical utilization. For medical utilization, the white collar worker's adjusted odds ratios of outpatient utilization for workers scoring in the third quartile and the highest quartile, compared to workers scoring in the lowest quartile were 1.50 (95% CI: 1.20-1.87) and 2.16 (95% CI: 1.69-2.75), respectively. The blue collar workers' adjusted odds ratios of outpatient utilization for workers scoring in the second (OR: 1.23, 95% CI: 1.06-1.43), third (OR: 1.42, 95% CI: 1.22-1.66) and highest quartile (OR:1.83, 95% CI: 1.55-2.17), respectively, compared to workers scoring in the lowest quartile were statistically significant. However, no associations were found between fatigue and inpatient utilization for either the white or blue collar workers. The blue collar workers' adjusted odds ratios of being injured for workers scoring in the second, third and highest quartile were 1.41 (95% CI: 1.00-2.00), 1.57 (95% CI: 1.10-2.22) and 2.41 (95% CI: 1.69-3.44), respectively, compared to those scoring in the lowest quartile, but, those of the white collar workers were not significant. There was more likely to an increased risk of sickness absence in workers scoring in the second, third and highest quartile compared to those scoring in the lowest quartile in both white and blue collar workers, but the magnitudes of risk were higher in the blue collar workers than the white collars workers. Conclusion: This result suggests that fatigue is a determinant predictor of medical utilization, occupational accident and sickness absence, and that the pattern of risks for the three outcomes differs according to the occupational type. Some limitations of this study and considerations for future study were also discussed.

청소년의 식이행태 조사 : 서울·양평 두 지역간 비교 The Comparison of Urban and Rural Areas

최준호,안동현,최보율,강윤주,백영석,조연규,고복자,남정현 漢陽大學校 精神健康硏究 1998 精神健康硏究 Vol.17 No.-

조혈모세포이식 후 발생한 주폐포자층 폐렴에 대한 고찰

주지현,최정현,이동건,백지연,고윤호,이혜정,김세희,신호진,박윤희,박지영,김유진,신완식,김춘추 대한감염학회 2001 감염 Vol.33 No.4

Background : Pneumocytitis cainii pneumonia (PCP) can occur in immunocompromised hosts especially such as AIDS or cancer patients. Although recent research had focused on PCP in AIDS patients, few studies have described the clinical presentations of PCP in recipients of stem cell transplantation (SCT). We evaluated the clinical manifestations of PCP in SCT patients admitted at St. Mary's hospital, Seoul, Korea. Methods : The medical records of 17 PCP patients undergoing SCT between Feb. 1998 and Feb. 2000 were reviewed. The diagnosis of PCP was confirmed through the demonstration of Pneumocytitis cainii via either cytology of brochoalveolar lavage (BAL) or histological technique of lung biopsy. CMV disease and CMV infection were confirmed by BAL culture and antigenemia respectively . Results : Seventeen patients were all recipients of allogeneic SCT and 7 of 17 patients were performed non-sibling SCT. Patients presented with symptoms including brief period (4 ∼23 days) of fever (76%), dyspnea (70%), cough (64%), and signs such as rare(58.8%), Sixteen patients (94%) had been receiving immunosuppressive agent such as cyclosporine A (64%) or Fk506 (35%) without PCP prophylaxis. Eleven patients (64%) were treated with corticosteroid with mean dose of 16 mg/day prednisolone and mean duration of 4.6 months after post-SCT period. Twelve patients were co-infected with CMV. Another co-infected miCroorganisms were Pseudomonas aeruginosa, Mycobacterium tuberculosis, herpes simplex virus, parainfluenza virus, Average duration of treatment with trimethoprim-sulfamethoxazole (TMP/SMX) was 21 ±9 days. Four patients died, and three of them were related with PCP. Conclusion : PCP developed frequently in patients who were taking immunosuppressive drug due to graft versus host disease or were not taking TMP/SMX prophylaxis. High risk patients showing fever, cough, or dyspnea should be considered to take early bronchoscopic intervention for detection of PCP. When treat for PCP, it also be considered to the possibility of coinfection such as CMV. (Korean J Infect Dis 33:273∼279, 2001)

청소년 식이태도와 식이행동의 횡문화적 연구

백영석,안동현,조연규,남정현,최보율,강윤주,고복자 大韓神經精神醫學會 1999 신경정신의학 Vol.38 No.3

연구목적 : 청소년을 대상으로 장애가 있는 식이태도 및 식이행동과 관련된 요인들에서 인종과 문화적 차이가 있는가를 보는 것이다. 방 법 : 1996년도에 3129명의 중고등학교 남녀 학생을 대상으로 학교 장면에서 신체 계측과 설문지를 통하여 수집하였으며 연령은 13세부터 16세 사이의 학생들로 분포되었다. 학생들의 분포는 서울 지역의 663명, 양평 지역의 821명, 조선족이 사는 연길 지역의 830명 그리고 한족이 사는 길림 지역의 815명이었으며, 그들은 모두 키, 몸무게, 신체질량지수, 부모의 수입, 아버지의 학력, 체중조절 설문지, 신체상 척도 및 식이태도검사 등의 내용을 완성하였다. 결 과 : 신체질량지수(BMI)에서는 지역, 성별, 사회경제적 상태에 따른 차이가 없었다. 연길과 길림 지역의 학생들이 서울과 양평 지역의 학생들보다 심한 저체중과 심한 과체중을 갖는 학생들이 많았다. 연길과 길림 지역의 학생들이 서울과 양평의 학생들보다 식이태도검사(EAT-26)의 평균치가 높아 식이태도와 식이행동이 나빴다. EAT-26의 20점 이상인 식이장애의 고위험군은 연길 지역의 학생이 6.9%로 네 집단 중에서 가장 많았다. 한국의 양평지역과 서울 지역의 학생들이 신체상 척도(BIS)의 평균치가 연길 지역과 길림 지역의 학생들보다 의미있게 높았다. 즉 한국의 학생들이 중국의 학생들보다 자신의 신체에 대하여 부정적인 생각을 갖고 있었다. 체중조절 행동의 유병율은 서울 지역 학생들이 26.7%, 양평 지역 학생들이 23.2%, 연길 지역 학생들이 10.6%, 그리고 길림 지역 학생들이 4.6%이었다. 식이조절과 운동은 한국의 학생들이, 식이조절과 약물사용은 중국의 학생들이 가장 많이 하는 방법이었다. 결 론 : 본 연구를 통하여 한국과 중국에서도 식이장애가 결코 적지 않을 것이라는 사실을 확인하였고, 식이장애는 인종과 사회문화적 요인에 의해 크게 영향을 받는다는 것, 마지막으로 식이태도와 식이행동 및 그와 관련된 요인들을 통해서 네 지역간의 문화전이 상태를 확인할 수 있었다. Objectives : The goal of this research was to attempt to examine ethnic and cultural differences in factors associated with disordered eating attitudes and behaviors. Methods : Data were collected from the four groups of 3,129 high school students aged between 13 and 16 years who completed school-based survey conducted in 1996. The students (663 Korean urban, 821 Korean rural, 830 Korean-Chinese and 815 Chinese adolescents) completed an instrument which assessed weight, height, Body Mass Index(BMI), parental income, father's level of education, weight control questionnaire, Body Image Scale(BIS), and eating attitudes and behaviors using the Eating Attitude Test-26(EAT-26). Results : BMI did not vary significantly by race, sex, and socioeconomic status. There were many severely underweight and severely overweight students among Korean-Chinese and Chinese than among Korean urban and Koran rural students. The EAT-26 mean scores of Korean-Chinese and Chinese subjects were significantly higher than those of Korean urban and Korean rural subjects. The EAT-26 mean score of Korean-Chinese was the highest among the four racial groups. The prevalence of high risk EAT-26(EAT-26≥20) students of Korean-Chinese was 6.9% which was the highest among the four groups. The BIS mean scores of Korean rural and Korean urban subjects were significantly higher than those of Korean-Chinese and Chinese subjects. The Korean subjects were more dissatisfied with their body than the Chinese. The prevalences of weight control behaviors were 26.7% in Korean urban, 23.2% in Korean rural, 10.6% in Korean-Chinese, and 4.6% in Chinese subjects. Dieting and exercise were most popular for weight reducing in Korean subjects. Dieting and drug use were most popular in Chinese subjects. Conclusion : These data suggest that there must be many eating disorder patients in Korea and China, and the eating attitudes and behaviors are influenced by ethnic and cultural factors. Implications for understanding sociocultural influence on eating attitudes and behaviors and acculturation are discussed.

유동대전에 의한 절연유중의 정전기 방전에 관한 연구

박재윤,박상현,김정달,고희석 경남대학교 신소재연구소 1993 論文集 Vol.3 No.-

本 硏究에서는 古體-流體 界面에서 流體가 유동할 때 발생되는 流動帶電에 의한 絶綠油中의 靜電氣 放電에 관한 硏究로서, 絶綠油中에 存在하는 正·負同數의 이온들이 電氣二重層을 이루고 있을 때 絶綠油가 帶電裝置를 통과하게 되면, 電荷分離, 電荷移動, 電荷緩和 및 蓄積現像이 일어나게 되므로 流動電流가 나타나게 된다. 流動電流는 유속의 증가에 따라 증가하고, 또 油溫이 증가함에 따라 약 50[℃]까지는 증가하고, 그 이상에서는 감소한다. 그리고 대전장치내에 가제(gauze)를 投入할 때 가제 장수가 8장까지는 流動電流가 증가하고, 그 이상에서는 감소한다. 또 7장까지는 측정탱크내면과 유면에서 방전이 일어나고, 8장일 때는 流動電流가 약 3×10^(-7)[A]가 되어 아크릴 방정관내부에 있는 絶綠紙와 絶綠油 界面에서 큰 전위차가 發生하여 부분 도는 연면방전이 일어나는 것을 觀察하였으며, 이 때 전류치를 측정·분석하였다. In this thesis, the electrostatic discharge in insulating oil by the streaming electrification, which is generated at a solid-liqid interface, has been studied. The streaming current is induced by charge-separation, charge-movement, charge-ralaxation and chargeaccumulation phenomena, when insulating oil having eletrical double layers of positive negative ions passes through an electrification apparatus. The streaming current increases linearly with increasing of oil velocity. The streaming current increases at lower than 50 C. The streaming current increases below eight sheets of gauzes and decreases above them, when gauzes are inserted into electrification apparatus. Also, electrostatic discharge at a measuring tank oil surface appears at seven sheets of gauzes and partial discharge of surface is shown at eight sheets of gauzes. This streaming current value was mearsured at this time.

유전치의 polyethylene fiber-post를 이용한 심미수복에 관한 증례 보고

서영주,조태식,김효석,고승백,정현구,이난영 조선대학교 구강생물학연구소 2002 口腔生物學硏究 Vol.26 No.2

In clinical practice, restoration of primary incisors severely affected by caries continues to be a challenge. Not only are these teeth difficult to restore. but the behavior of the patient can affect treatment negatively. An acceptable restoration for maxillary anterior incisors should have matching material color, durability, adhesive cementation that is biocompatible with the pulp, easily and rapidly placed. This Paper describes two cases showing an alternative technique for the construction of completely destroyed upper incisors with polyethylene ribbons for retention and stability for the resin crowns.