서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)

김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2

Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.

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.

진상전류 추정에 의한 태양광 발전시스템의 최대출력제어

우정인,신동률,허태원,박지호,노인배 東亞大學校 大學院 1997 大學院論文集 Vol.22 No.-

Photovoltaic power may vary depending on the various solar cell has an optimal generating point to be able to get the maximum power tracking, in order to get the more power recovery on the switching control system. However the V-I characteristics of the solar array at the frequency have hysteresis, in such high frequency region the conventional controller based on no hysteresis can not be responsible for control of the photovoltaic power system. Therefore, in this paper we proposed a maximum power tracking technique to improve the operation in the region of high frequency[5KHz-30KHz] with added C-R differential circuit for zero cross switching. The distinguishing characteristics of this method is to be controlled by the estimated values of resistive current and sensed photovoltaic terminal voltage do not depend on the operating frequency. the experimental result of the power system is controlled by the proposed sampling.

반응성 스펏터링에 의한 TiO₂막의 제조 및 특성

우정옥,박욱동,박기철,김기완 경북대학교 센서기술연구소 1991 센서技術學術大會論文集 Vol.2 No.1

The goal of this thesis is to investigate the titanium dioxide (TiO_(2)) thin films for the color sensor application. The TiO_(2) thin films have been fabricated by RF reactive sputtering method. In this time, RF power, substrate temperature, O_(2)/(Ar+O_(2)) ratio and working pressure are 80~220W, 0~300℃, 10~70% and 50~200Torr, respectively. The electrical and optical properties are examined by different deposition conditions. The optical properties of the TiO_(2) thin films deposited on ITO film are examined by optical spectrophotometry in the wavelength range from 300 to 700nm. When RF power, substrate temperature and O_(2)/Ar+O_(2) ratio are 80W, 100℃. 50% and 50mTorr, the values of resistivity and transmittance of the TiO_(2) films in visible region are 5x10^(-3) Ω·cm and about 90s, respectively. The optical bandgap of TiO_(2) films is about 3.6eV.

Shrinkage Estimation of Parameters in a Linear Model

禹正秀,金東郁 嶺南大學校附設 基礎科學硏究所 1984 基礎科學硏究 Vol.4 No.-

In this paper we shall propose shrinkage estimator in a linear model. We shall find the condition that can be used in seeking the situations in which proposed estimator is superior to the least square estimator.

공간벡터변조에 의한 반송용 편측식 선형유도전동기의 센서리스 속도제어

우정인,노태균,신동률,고성현 東亞大學校 附設 情報通信硏究所 1997 情報通信硏究所論文誌 Vol.5 No.1

Space Vector control of linear induction motor without speed sensor is one of the most up-to-date researching subjects to the engineers in the fields of power electronics and control theory. A conveyance SLIM(Single-sided Linear Induction Motor) has required a stable speed and a soft start/atop when the goods convey. So, the close loop control method to use a speed sensor have been adopted and as the speed sensor, a linear encorder has been used. But when the speed sensor used, the application boundary is limited and the confidence of system is diminished because it is sensitive to external environment variations and its cost is very expensive. So to solve these problems, this paper deals with speed control of the conveyance SLIM using space vector without speed sensorless.

苦汁으로 부터 炭酸마그네슘과 酸化마그네슘의 最適合成條件에 關한 硏究

鄭東燻,辛宗根,申和雨 圓光大學校 1989 論文集 Vol.23 No.2

고즙과 탄산나트륨을 원료로 1)반응액의 온도, 2)반응액의 농도, 3)혼합비율(〔Bittern〕/〔Na₂CO₃〕), 4)작용시간 및 5)건조온도를 합성요인으로 하여 Box-Wilson 실험계획법에 의해 탄산마그네슘의 최적합성조건을 추구하고 그 중 우수제품에 대해 D.S.C.를 측정하여 이를 기준으로 하소시켜 산화마그네슘을 제조하여 용적시험, 제산도시험 및 광학현미경사진을 관찰한 결과 1. 탄산마그네슘의 최적합성조건의 범위는 ①반응액의 온도범위는 50∼70℃ ②반응액의 농도범위는 고즙은 37.3∼38.1%, 탄산나트륨은 9.9∼10.3%, ③혼합비율(〔Bittern〕/〔Na₂CO₃〕)의 범위는 1.485∼1.503, ④작용시간의 범위는 10∼12분, ⑤건조온도의 범위는 73∼83℃이다. 2. 시료탄산마그네슘의 D.S.C.측정결과 75℃정도에서 결정수의 이탈로 보이는 흡열Peak를 나타냈고, 290℃정도에서 구조수의 이탈로 생각되는 흡열Peak를 나타냈으며, 408℃정도에서 탄산깨스의 이탈로 생각되는 흡열Peak를 나타냈다. 3. 탄산마그네슘의 하소온도는 500∼600℃가 적당하겠으며, 용적시험결과는 모두 경질품이었고, 시판품보다 모두 용적시험치가 큰 결과를 나타냈다. 4. 제산도시험의 결과는 시판품의 제산능보다 모두 크며 광학현미경사진에 의한 관찰을 하였다. Optimal Synthesis Condition of Magnesium Carbonate were investigated from the viewpoint of bulkiness according to a randomized complete block design proposed by G.E.P. Box and K.B. Wilson. Bittern and Sodium Carbonate were utilized as reactants in order to prepare Magnesium Carbonate. It was found that optimum temperature range of reactant solutions was 50∼70℃ and the optimum concentration range of the reactant solutions was 37.3∼38.1%(Bittern), 9.9∼10.3%(Sodium Carbonate), on the viewpoint of bulkiness. The optimum mole ratio of Bittern to Sodium Carbonate was in the range of 1.485∼1.503and the optimum reacting time range was 10∼12minutes. The optimum drying temperature range was 73∼83℃. Magnesium Oxide comes two types of granules when prepared by calcination of Magnesium Carbonate. The outcome of D.S.C. indicated a desolvation of Magnesium Carbonate occurred at about 75℃. The dehydration of the compound ceased at about 290℃ and the decarboxylation ceased at about 408℃. The physical and chemical properties of Magnesium Oxide as medicine were studied by use of Volume Test, Optical microscopic photographs and Acid Consuming Capacity measurments.

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.

교류여자방식 브러시리스 동기전동기의 공간벡터에 의한 토오크제어

우정인,정영일,노태균,조용길,신동률 東亞大學校 附設 情報通信硏究所 1997 情報通信硏究所論文誌 Vol.5 No.1

In the paper, a vector control method for a AC-excited BLSM(Brushless Synchronous Motor) is proposed. The BLSM has a feature that separate exciter is not needed for excitation. The proposed method is described in two parts as follow, one is the design of drive and the other is a modeling for its imlpementation. Rotor flux is estimated using inditect sensing method based on voltage equation in the synchronously rotation reference frame. And rotor position os calculated from rotor angular velocity and stator current. Through computer simulation results of this prorosed system, it is shown that the BLSM drive has a ability of precision torque control from the static and dynamic performances.

반송용 편측식 선형기기의 추력제어에 의한 특성해석

우정인,신동률,조용길,노태균 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-

본 논문에서는 PWM 인버터 구동 편측식 선형유도 전동기(이하 SLIM)의 공간백터 제어와 PI 제어를 통한 추력 제어를 행한다. 1차측 권선과 SLIM의 2차측 구조 사이에서 발생하는 공극길이의 떨림은 빠른 응답특성을 얻기위해서 최소화 되어야 한다. 먼저, SLIM의 전압방정식이 추력과 수직력 특성을 해석하기 위하여 d-q축 등가회로로서 나타내어진다. 또한, d-q축 등가회로의 모델링과 해석은 등가회로상에서 전류변동에 따른 강인한 과도 추력특성을 얻을 수 있다. 지령속도와 추력에 의한 SLIM의 직접구동 결과는 실험을 통해서 확인된다.