능동역률보정방식의 도입에 의한 권선형 유도 전동기의 슬립전력 회수특성의 개선

추영배 거제전문대학 1998 論文集 Vol.6 No.-

Static Scherbius system is one of the latest winding induction motor drive systems which has many advantages such as high efficiency, excellent controllability and so on. But for more wide application of this system some conditions should be improved such as high reactive power and additive need of power transformer in the slip power recovery process. This paper deals with the high performance static Scherbius type slip power recovery system. In this system, active power factor correction method is used in DC side instead of transformer in AC side for the proper matching the rotor voltage with line voltage, and speed can be controlled by the chopper duty ratio, not by inverter firing angle. This results that the reactive power produced by phase controlled inverter and diode rectifier can be greatly reduced with linear speed regulation. Moreover, the harmonic components in the rotor current caused by the commutation of diode rectifier can be considerably suppressed.

전류용 보조권선의 적정여자에 의한 SRM에서의 진동과 소음의 저감

추영배 거제전문대학 1999 論文集 Vol.8 No.-

In spite of the simple and rugged motor structure and drive circuits, switched reluctance motor(SRM) has good overall performance over a wide torque-speed range. Most serious problem of SRM is the higher torque ripple compared with conventional machines, which is inherently generated because of the torque production mechanism by the step pulse m.m.f. and contributes to vibration and acoustic noise. This torque ripple is mainly induced by radial force on the phase commutation region and in the vibration and acoustic noise characteristics, the frequency or motor speed of peak vibrations and acoustic noises is coincided with the natural resonant frequency of the magnetic structure and frame materials. This paper suggest the new electromagnetic structure of SRM with auxiliary commutation winding and the technique which allows vibration and acoustic noise reduction through smoothing commutation by exciting the commutation winding with d.c. source. The laboratory drive demonstrates that the implementation of this noise cancellation technique is very useful in SRM drive.

고등학교 운동선수에서 최대하 Treadmill 운동시 심폐기능의 변화와 산소섭취량의 추산법

배옥석,김형진,박재식,주영은 慶北大學校 醫科大學 1990 慶北醫大誌 Vol.31 No.3

고등학교 운동선수에서 최대하 treadmill 운동시험시 심폐기능의 변화를 구명하고 운동부하, 운동시간 및 심박수로부터 산소섭취량을 추산할 수 있는 회귀방정식을 유도하고자 15∼18세의 남자 고등학생 운동선수 14명과 비운동선수 16명을 대상으로 하여 Bruce법에 따라 treadmill 상에서 최대 운동능력의 80%에 해당하는 최대하운동을 실시하고 운동전, 운동중 및 운동후에 심박수, 혈압, 분시환기량, 탄산가스생산량 및 산소섭취량을 측정하였으며 운동 전후에 폐환기역학 검사를 시행하였다. 심박수는 선수군에서 안정시의 71.9±1.3회로부터 운동중 178.0±2.0회까지 증가하여 최대심박수의 81.2±2.3%에 달하였고 비선수군에서는 안정시의 81.8±2.4회로부터 182.6±1.1회까지 증가하여 최대심박수의 79.6±2.0%에 달하였다. 선수군의 심박수는 비선수군에 비해 전 실험기간에 걸쳐 유의(P<0.01)하게 낮은 값을 유지하였다. 분시환기량은 선수군에서 안정시의 5.1±0.6 L/min로부터 운동중 63.0 L/min까지 증가하였고 비선수군에서는 안정시의 5.2±0.5 L/min로부터 51.2 L/min 까지 증가하였으며 양군 사이에는 유의한 차이가 없었다. 산소섭취량은 선수군에서 안정시 1.0±0.4 ㎖/㎏/min로부터 운동중 32.6 ㎖/㎏/min까지 증가하여 최대산소섭취량의 72.9%에 달했으며 비선수군에서는 안정시 1.4±0.3 ㎖/㎏/min로부터 28.9 ㎖/㎏/min까지 증가하여 최대산소섭취량의 70.3%에 달하였다. 선수군의 산소섭취량은 비선수군에 비해 계속 낮은 경향을 보였다. Treadmill 속도 및 경사도와 산소섭취량 간의 중회귀분석 결과 중상관계수 0.9998로서 높은 상관관계를 나타내었다. Bruce법에 따른 운동시간과 산소섭취량 간의 회귀분석 결과 1차함수 회귀식에 대한 상관계수는 0.999였으나 3차함수 회귀식에 대한 상관계수는 0.99999로서 극히 높은 상관관계를 나타내었다. 심박수와 산소섭취량 간에는 상관계수 0.998 및 0.992로서 대체로 높은 직선적 상관관계를 나타내었다. 폐기능검사 결과 안정시 FVC, FEF_(0.2-1.2L), FEF_25% 및 MVV는 선수군에서 비선수군에 비해 유의(P<0.05)하게 높았다. 운동후 폐기능검사 성적은 비선수군에서는 안정시보다 저하된 경향을 보인데 비해 선수군에서는 향상된 경향을 보였다. The cardiorespiratory function was evaluated during and after a submaximal treadmill exercise and some regression equations were derived for estimation of oxygen uptake from exercise load, exercise time and the heart rate. A total of 30 high school boys, of whom 14 were athletic and 16 non-athletic, performed a submaximal treadmill exercise according to the Bruce protocol to the point when 80% of their maximum exercising capacity were reached. The heart rate, blood pressure, minute ventilation, CO_2 production and O_2 uptake were measured before, during and after exercise, and the pulmonary function test was performed before and after exercise. Heart rate was increased from 71.9±1.3 beats/min at rest to 178.0±2.0 during exercise which was 81.2±2.3% of the maximum heart rate in athletes, and from 81.8±2.4 beats/min at rest to 182.6±1.1 which was 79.6±2.0% of its maximum in non-athletes. Athletes showed significantly (P<0.01) lower heart rate than non-athletes throughout the experimental period. Minute ventilation was increased from 5.1±0.6 L/min at rest to 63.0 in athletes and from 5.2±0.5 L/min to 51.2 in non-athletes. Athletes and non-athletes showed no significant difference. Oxygen uptake was increased from 1.0±0.4 ㎖/㎏/min at rest to 32.6 which was 72.9% of maximum oxygen uptake in athletes, and from 1.4±0.3 ㎖/㎏/min to 28.9 which was 70.3% of the maximum in non-athletes. Athletes showed consistently lower oxygen uptake than non-athletes. Multiple regression analysis between treadmill speed and grade and the oxygen uptake showed a high correlation coefficient of 0.9998. A first order regression analysis between exercise time and oxygen uptake showed a correlation coefficient of 0.999, while a third order regression analysis showed an extremely high correlation coefficient of 0.99999. The heart rate and oxygen uptake showed a linear regression with a reasonably high correlation coefficient of 0.998 and 0.992. The pulmonary function test revealed significantly(P<0.05) higher FVC, FEF_(0.2-1.2L), FEF_25% and MVV at rest in athletes than in non-athletes. After exercise, athletes showed enhanced pulmonary function compared with the resting state while non-athletes showed more or less decreased.

Rebounder 運動負荷後 恢復期의 心肺機能의 變化

裵玉錫,黃樹寬,金亨鎭,朱永恩 慶北大學校 醫科大學 1982 慶北醫大誌 Vol.23 No.2

20∼22歲의 男子大學生 61名을 硏究對象으로 하여 選手群(21名)과 非選手群(40名)으로 區分하였다 運動負荷는 rebouner에 垂直뛰기를 一分間에 80回程度로 3分동안 實施했으며, 運動後 恢復期 1, 3, 5, 10 및 20分에서 心搏數, 血壓, 呼吸數의 恢復樣相을 觀察하였다. 이로써 체력단속이 恢復期의 心肺機能에 미치는 影響을 分析하고 나아가서 恢復期의 心肺反應이 體力을 評價하는 指標가 될 것인가를 알고자 試圖한 本 硏究結果를 要約하면 다음과 같다. 安靜狀態의 心搏數는 選手群이 非選手群에 比해서 有意하게 낮았으며 血壓 및 呼吸數는 別 差異가 없었다. 運動負荷後 心搏數의 恢復은 選手群은 恢復 1分에 86.4±3.22回로서 非選手群의 118.0±2.81回에 比해 有意하게 낮았고, 兩群 모두 恢復初期에는 急速한 恢復을 보였으며 選手群이 非選手群에 比해 繼續有意하게 낮은 값으로 빠른 速度로 恢復되었다. 運動負荷後 收縮期血壓의 恢復樣相은 選手群이 非選手群보다 繼續 낮은 값으로 恢復되었으며, 特히 恢復 1分에 選手群은 161.2±1.78mmHg로 非選手群의 174.1±3.41mmHg에 比해 有意하게 낮았다. 兩群 모두 恢復初期에 急速히 恢復하여 恢復10分에는 安靜狀態로 恢復되었다. 그리고, 擴張期血壓은 非選手群은 期動後 安靜狀態보다 有意하게 높았으며, 選手群은 오히려 安靜狀態보다 낮았다. 平均動脈壓은 恢復初期에 選手群이 非選手群보다 높은 값으로 恢復되었으나 恢復10分부터는 거의 같은 값으로 恢復되었다. 脈壓은 選手群이 非選手群에 比해 繼續 有意하게 낮은 값으로 恢復되었다. 運動負荷後 呼吸數는 恢復 1分에 選手群에서는 27.1±1.23回로 非選手群의 35.5±1.17回에 比해 有意하게 낮았고, 兩群 모두 恢復 1,3分에 急速히 恢復되었으며, 選手群이 非選手群에 比해 繼續 有意하게 낮은 값으로 恢復되었다. 本硏究結果를 綜合하면 rebounder 運動負荷後 選手群의 心搏數, 血壓 및 呼吸數가 非選手群에 比해 有意하게 낮았으며, 그 恢復速度도 빨랐다. 특히 心搏數는 選手群과 非選手群 사이에 恢復初期부터 恢復 20分까지 繼續 有意한 差異를 나타낸 점은 體力을 客觀的으로 評價하는 重要한 資料가 될 것으로 思料되는 바이다. Sixty-one male subjects aged between 20-22 years were divided into the athletic and non-athletic groups. Exercise was performed as vertical jump on a rebounder at 80 times per min for 3min. The heart rate, blood pressure, and respiratory rate were measured at 1, 3, 5, 10, and 20min after exercise in an effort to analyze the effect of the physical training on the cardiopulmonary function during the recovery period, and to find out if the cardiopulmonary responses during recovery period can be an index of physical fitness. The results are summarized as follows. In resting state, the heart rate was significantly lower in athletes than in non-athletes, while blood pressure and respiratory rate showed no significant difference between the two groups. The heart rate at 1min after the exercise was 86.4±3.22 in athletes which was significantly lower than 118.5±7.85 in non-athletes. The heart rate at the initial stage after exercise showed a rapid recovery in both groups. In athletes, it showed a rapid recovery to reach a significantly lower level than that of non-athletes. The systolic pressure was lower in athletes than in non-athletes throughout the recovery period. In particular, systolic pressure at 1min after the exercise was 161.2±1.78 mmHg in athletes which was significantly lower than 174.1±3.41mmHg in non-athletes. Systolic pressure at initial stage after the exercise showed a rapid recovery, and the resting value was retored in 10 min in both groups. Diastolic pressure during the recovery period was significantly higher in non-athletes and lower in athletes than the resting level.

가변전압과 어드반스각의 조절을 이용한 SRM의 상전류 파형개선에 대한 연구

추영배 거제전문대학 1998 論文集 Vol.7 No.-

Although switched reluctance motor(SRM) has the electro-magnetic structure proper to be driven by pulse currents with the type of rectangular wave, actual phase currents by voltage-fed inverter has various waveforms according to the operating speed, the load torque and switching angle. In this paper, one variable-speed SRM system is presented in which the motor is driven by single pulse current with flat-topped waveform independently of load conditions and operating speed. In this system, exciting voltage is regulated to balance with the speed voltage in inductance increasing region first, and second advance angle is modulated by the difference of currents detected at two point in that region. The validity of this system are verified by the experimental results in various load conditions.

초기 톨루엔 농도가 톨루엔-NO_(x)-공기 혼합물의 광산화 반응에 미치는 영향 : II. 입자상 물질의 생성 및 성장 II. Aerosol Formation and Growth

이영미,배귀남,이승복,김민철,문길주 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.1

An experimental investigation of the gas-phase photooxidation of toluene-NOx-air mixtures at sub-ppm concentrations has been carried out in a 6.9 ㎡, indoor smog chamber irradiated by blacklights. Measured parameters in the toluene-NO_(x) experiments included aerosol, O₃, NO, NO₂, NO_(x), CO, SO₂, toluene, and air temperature. The initial toluene concentration ranged from 225 ppb to 991 ppb and the initial concentration ratio of toluene/NOx in ppbC/ppb was in the range of 5~20. It was found that the variation of aerosol number concentration with irradiation time caused by the photooxidation of toluene-NOx-air mixtures depended on the initial toluene concentration for similar concentration ratio of toluene/NO_(x). The dependency of initial toluene concentration on the photooxidation of toluene-NO_(x)-air mixtures for toluene/NOx=5~6 seemed to be opposite to that for toluene/NO_(x)= 10~11. The maximum number concentration of aerosols formed by photooxidation and the aerosol yield depended on both initial toluene concentration and initial concentration ratio of toluene/NO_(x). In this study, the aerosol yield, defined as aerosol formed per unit toluene consumed, was found to be 0.01~0.16.

ZnO:AI 과 ITO 투명전도막을 이용한 플랙시블 DSCs의 변환효율 특성

정기영,김지훈,성열문,곽동주,추영배 경성대학교 공학기술연구소 2010 공학기술연구지 Vol.16 No.-

In order to investigate the possible application of ZnO films as a transparent conducting oxide (TCO) electrode for film-typed dye sensitized solar cell(F-DSC), ZnO:Al films were prepared by RF magnetron sputtering method. The effects of gas pressure on the structural and electrical properties of ZnO films were mainly studied experimentally. F-DSC using either a ZnO:Al or indium tin oxide (ITO) electrode were also fabricated separately under the same manufacturing conditions. The electro-optical conversion efficiency and fill factor of the F-DSCs using both ZnO:Al and ITO transparent conducting electrodes were measured and compared with each other. ZnO:Al films showed the minimum resistivity of 2.6 x10^(-3)Ω-cm and a transmittance of 91.7% under the experimental conditions of doping concentration of 2 wt% of Al₂0₃ and gas pressure of 5mTorr. ITO films fabricated at 5mTorr of gas pressure also showed the minimum resistivity of 1.5x10^(-3)Ω-cm and transmittance of 92.1%. Although the electrical resistivity of ZnO:Al is higher than that of ITO, the conversion efficiency of F-DSC using ZnO:Al was comparable with that of F-DSC using ITO. The conversion efficiency of F-DSCs using ZnO:Al and ITO electrodes are about 2.8% and 2.9%, respectively.

초기 톨루엔 농도가 톨루엔-NOx-공기 혼합물의 광산화 반응에 미치는 영향 : I. 가스상 물질의 변화 I. Change of Gaseous Species

이영미,배귀남,이승복,김민철,문길주 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.1

An experimental investigation of the gas-phase photooxidation of toluene-NO_(x)-air mixtures at sub-ppm concentrations has been carried out in a 6.9 ㎥, indoor smog chamber irradiated by blacklights. Measured parameters in the toluene-NOx experiments included O₃, NO, NO₂, NO_(x), CO, SO₂, toluene, and air temperature. The initial toluene concentration ranged from 225 ppb to 991 ppb and the initial concentration ratio of toluene/NOx in ppbC/ppb was in the range of 5~20. It was found that the variation of gaseous species with irradiation time caused by the photooxidation of toluene-NOx-air mixtures depended on the initial toluene concentration for similar concentration ratio of toluene/NOx. The dependency of initial toluene concentration on the photooxidation of toluene-NO_(x)-air mixtures for toluene/NOx =5~6 seemed to be opposite to that for toluene/NOx=10~11. The arriving time at maximum ozone concentration depended on both initial toluene concentration and initial concentration ratio of toluene/NOx. However, the maximum concentration of ozone formed by photooxidation depended only on the initial toluene concentration.

필름형 염료감응태양전지용 AZO 투명전도막의 개발

박병욱,성열문,추영배,곽동주 경성대학교 공학기술연구소 2008 공학기술연구지 Vol.15 No.-

Recently, much interest has been paid in using plastic materials for replacing glass substrates with increasing applications for large scale flexible flat panel display and flexible film-typed dye sensitized solar cell(DSCs) In particular, flexible film-typed dye sensitized solar cell(DSCs) has attracted much interest because it can be applied to a smart window, a wearable PC as a supplementary power supplier and a winter clothes In this paper ZnO:Al thin film, which serves as a transparent conducting layer, was deposited on the polyethylene terephthalate(PET) substrate by the capacitively coupled r. f. magnetron sputtering method The effect of r. f. discharge power on the morphological, electrical and optical properties of ZnO:Al thin film were studied The film deposited on the PET substrate at r. f. discharge power of above 200 W and gas pressure of 5mTorr showed the minimum resistivity of about 2×10-3 Ω-cm, a transmittance of about 87% and optical band gap of 3.56 eV.

PWR에 使用되는 우라늄의 精製 및 濃縮에 關한 硏究(Ⅰ) : 國內産 우라늄 鑛石에서 黃酸浸出과 溶媒抽出에 依한 우라늄精製 Uranium concentration from the Domestic Uranium ores by Sulphuric Leaching and Solvent Extraction

金鍾一,朴永錫,丁梧鎭,李秀一,金熙峰,裵相龍,秋相根 조선대학교 동력자원연구소 1986 動力資源硏究所誌 Vol.8 No.2

This research was undertaken to study the mineralogy, and the optimum conditions for uranium leaching and extraction from the Okchon system graphite ores in the Kumsan areas. A research has been needed to study the refining process for the effective leaching and extraction from uranium ores in the Kumsan area which has more uranium deposits than any other area. By the mineralogical study with the powder X-ray diffraction method, primary uranium minerals are uraninite, brannerite, coffinite etc. and secondary uranium minerals are uranocircite, niobium uranium oxide, carnotite, toberite etc. has developed in the studied area uranium ores. The volumetric ratio of the primary and the secondary uranium minerals are approximatly 1 : 5. In this experiment, the uranium-bearing graphite in the Kumsan area was milled with a jaw crusher and ballmill. This milled uranium-bearing graphite was leached by sulfuric acid and from this sulfuric acid-leaching solution, uranium was extracted by Amberlite LA-1 in kerosene. The results are as follows: (1) The optimum results in the leaching process are : acidity pH = 1.0, temperature : 25.0℃, particle size : -80+120 mesh, leaching time : 24 hours, pulp density : 50% solid (2) A good pH range for uranium extraction was between 0.8 and 1.3. (3) The uranium distribution coefficient increases in direct proportional to the concentration of the Amberlite LA-1 as extractive agent. (4) The optimum time at 200rpm was 15 minutes.