갈륨액체금속 이온원과 인듐액체금속 이온원의 빔 특성에 대한 연구

현정우,임연찬,정강원,정원희,박철우,이종향,강승언 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-

본 연구에서는 인듐 액체금속이온원을 제작하여 빔 특성에 대해 연구를 하였으며, 기존에 연구를 하였던 갈륨 액체금속이온원의 빔특성과 비교 분석 하였다. 빔특성 분석을 위해 빔 안정도, 전류-전압특성곡선, 에너지 퍼짐을 측정하였다. 액체금속이온원에 사용되는 액체금속 저장소 및 바늘전극(tip)은 500μm의 직경을 갖는 텅스텐을 사용하였으며, 국내에서 제작된 제품을 사용하였다. 액체금속 저장소의 구조는 이전에 구상하여 연구가 이루어진 6개의 pre-etching된 텅스텐와이어(wire)가 묶여진 형태를 사용하였다.

한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.

초등학교 교실에서의 창의적 시 읽기 지도 방안 연구

강현국,정우기 대구교육대학교 2004 論文集 Vol.39 No.-

유자 중 limonoid 화합물의 정량 및 분리정제에 관한 연구

우강용,하정욱,우동균 慶南大學校 附設 工業技術硏究所 1997 硏究論文集 Vol.15 No.1

남해안에서 생산되는 유자의 씨와 과피중의 limonoid 함량을 HPLC (Spectra Physics 8800, U.S.A)에 의하여 분석 정량해 보았다. Limonoid 화합물 중 limonin과 nomilin은 methanol과 acetone에 의해 비교적 추출이 용이하였으며, acetone과 acetonitrile에 의해서 naringin이 거의 추출되지 않았으나 methanol에 의해서는 상당히 많은 양이 추출되었다. 유자씨에는 107.4mg%의 limonin과 85.39mg%의 nomilin이 함유되어 있으나, 유자 과피중에는 0.05mg%의 limonin과 0.034mg%의 nomilin이 함유되어 있었다. Amberite XAD-2 칼럼상에서 naringin 이 초기에 용출된 다음 100∼150㎖ 사이에서 limonin이 그리고 200∼250㎖ 사이에서 nomilin이 각가 최대의 용출율을 나타냄으로서 limonin과 nomilin의 분리정제 가능성이 확인되었다. Seeds and sarcocarp of citron from the southern part of Korean peninsula were analyzed for limonoid content by HPLC (Spectra Physics 8800, U.S.A) with the Nova-pak C18 column. Limonin and nomilin were well extracted by methanol and acetone, respectively, and little naringin was extracted by acetone or acetonitrile, but extracted in great quantity by methanol. Citron seeds contained 107.4 mg% of limonin and 85.39 mg% fo nomilin, and citron sarcocarp had 50 ppm of limonin and 34 ppm of nomilin. On the Amberite XAD-2 column naringin was elured at first, and then limonin and nomilin were eluted between 100㎖ and 150㎖, and between 200㎖ and 250㎖, respectively.

하수슬러지 건조공정 분석 및 개선에 관한 연구

강우정 忠州大學校 2005 한국교통대학교 논문집 Vol.40 No.2

A number of studies have been carried out to solve serious environmental problems occurred around the sorld. The natural environment has been destroyed by the continuous water pollution increase. Although fundamental technologies and waste-water disposal facilities have applied to solve this problem, additional sewage still increase gradually. Therefore various efficient disposal methods are needed to treat the sewage. Until now, the ways of simple reclaiming, dumping in the sea or incineration have been used to solve the problems, which are causing the sccondary environmental pollution. The sewage recycling is a solution for preventing environment pollution and maximzing economical values. In this study dryer plant for sewage sludge was investigate to efficiency. The dryter plant for sewage sludge was improved in vies of facility capacity, fuel esage and efficiency of environmental equipments.

펄스코로나 방전에서의 NOⅹ 저감 에너지 효율에 관한 실험적 연구

姜宇政,申昌均 충주대학교 산업과학기술연구소 2002 産業科學論文集 Vol.10 No.-

Rapid recent development in industry generated environmental issues. The NOx, the main cause for the air pollution, increases the Ozone-concentration and becomes a factor for the photochemical smog and acid-rain. Thus, the preventive method as well as the inhibitive technique for NOx have been demanded. The purpose of present study is to change the harmful gas using high voltage pulse system. In order to reduce the harmful NOx, experiments were done with changes in gas temperature, NOx initial concentration, C_2H_4 concentration, and the amount of pulse voltage.

회전건조로를 이용한 하수슬러지 건조 인자에 관한 실험적연구

姜宇政,李基福 충주대 2003 産業科學論文集 Vol.11 No.-

The general methods of sewage sludge disposal Simple reclaiming, Dumping in the sea, Incineration are causing so many problems, and sewage sludge dry for safety disposal can cut down on the delivery expense from reducibility effect of the volume and weight, also can prevent the several second environmental pollution. It is a necessary process of the multiple disposal method to raise a economization and efficiency of sewage sludge final disposal. Such a point of this view, dry is a simple method, but chemical properties, heat properties, physical properties by physical law of sewage sludge have brought a difficulty of dryer operation. Therefore in this study of several factors occurred during operating a dryer has been systematically formed, and as a result of the test to draw out the optimal drying process condition with the factor the amount use of fuel, pressure, over air amount, damper opening and shutting rate, rotary kiln revolutions, transfer device revolution in the rotary dryer, by using Taguchi method. It is achieved a hight efficiency of dryer that is decided the most suitable operating condition of swage sludge dryer

항정신병약물을 처음으로 사용하는 초발 정신증 환자에서 나타나는 체중 및 대사성 지표의 변화 : 후향적 연구

김우진,심주철,공보금,강제욱,문정준,김정은,김민걸,박민경,김성진,김현정,정도운 대한생물치료정신의학회 2011 생물치료정신의학 Vol.17 No.2

Objectives:This study was to identify weight & metabolic changes in first-episode psychotic patients with antipsychotics use and investigate the differences of weight & metabolic changes between first-episode psychotic patients and controls with antipsychotics use. Method:In this retrospective study, twenty eight first-episode psychotic patients and twenty eight controls with schizophrenia, schizoaffective or bipolar disorder defined by DSM-IV criteria were included. Information about demographic and clinical characteristics of the subjects was gathered from the medical records. Also body weight, sBP, dBP, fasting glucose, lipid profile and WBC count were evaluated before and after antipsychotics use. Rogistic regression was conducted to assess factors associated with weight gain. Results:First-episode psychotic patients showed more weight and BMI changes than controls after antipsychotics use, and these changes continue over 12 months. On the other hand, there were no significant factors associated with weight gain. Conclusion:The results of present study suggest that antispychotics is one of the major causes inducing weight gain of psychotic patients and antipsychotics-induced weight gain is more vulnerable to drug-naive first-episode psychotic patients.

LPF와 반복삽입을 이용한 효율적인 오디오 워터마크 추출

강혜원,이우선,정성환 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

We propose a method to decrease greatly the of original signal and improve efficiency in extraction process by modifying the existent audio watermarking extraction process. In the extraction process, we improve the efficiency of watermark extraction through repeated insertion of watermark and usage of a simple low frequency filter to remove a signal similar to an original signal as a preprocessing. As the result of experiment using some actuality audio data, we get watermark detection rate improvement of about 79%.

저온 플라즈마 장치를 이용한 NOx 및 SOx 저감에 대한 에틸렌가스의 첨가효과

강우정 충주대 산업과학기술연구소 1999 産業科學論文集 Vol.7 No.1

The following conclusions can be obtained. In the case when noxious materials are NOx and SOx that have the same concentration in the sample gas, the reduction rate of NOx and SOx is increased because the ionization works well in the reactor and the radical reaction among NOx, SOx and C2H4. When the initial concentration of NOx and SOx is lower, the additional amount of C2H4 is higher, the flow rate is lower, the oxygen concentration is higher, and the input voltage and the frequency are higher, the reduction rate of NOx and SOx are increased similarly.