까치에 의하여 發生하는 配電線路의 故障豫防에 관한 硏究

전시식,장석구,심재명 한밭대학교 2004 한밭대학교 논문집 Vol.21 No.-

In modern times, electricity is an essential energy and its dependence to people is more increased. The distribution line system in Korea consists of 22.9kV multi-ground connection. The 15.2% of distribution line troubles is being produced by birds' contact with distribution line. The cause of the interruption of electric power is mostly a magpie. To prevent the troubles by magpie, various kinds of prevention measures have been tried for 20 years. But the trouble continues to be happened by magpie's outstanding ability of learning. In this paper, the effectiveness of prevention equipments using a sense of touch, sight and hearing which have been used at Korean Electric Power Corporation is analyzed and more effective prevention measures is considered. As a results, to prevent the troubles, it is difficult to get good effectiveness when only one prevention measure is applied. However, when several measures are applied at the same time, the troubles can be reduced. Also, even though magpies build their nests, for not to make the troubles, a electric pole equipment should be corrected and its form should be improved. In addition, we have found the facts that the activity periods for moderating the number of magpie and for removing the nests, weather, and DB system are simultaneously considered as the effective prevention measures.

반달형 베플을 갖는 이중벽튜브 중기발생기의 특성 평가

위명환,김성오,전원대,어재혁,김진환 한국공업화학회 2004 응용화학 Vol.8 No.2

The DWTSG concept is proposed as a advanced steam generator of liquid metal reactor to avoid sodium-water reaction incidents in the SG. The optimization of steam generator from economic viewpoint is to minimize the total cost of heat transfer area and pumping power. The baffles are primarily used in shell and tube steam generator for inducing cross flow over tube bundles, and as a results, improving heat transfer performance. In this paper a computer based design method, which covers segmentally baffled steam generator is developed for preliminary DWTSG design. And parametric sensitivity studies are done to determine required heat transfer area to meet the specified heat capacity by calculating minimum or allowable shell-side pressure loss.

알코올의 섭취가 흰쥐의 혈액과 간의 지질대사에 미치는 영향

이명숙,김영연,김효숙,김매하,전진순,서진숙,송선미,양영재,윤원손,이미라,이효영,정승현 誠信女子大學校 生活文化硏究所 2004 生活文化硏究 Vol.18 No.-

To investigate the effects of ethanol on the lipid metabolism in blood and liver, twenty one male Sprague Dawley rats had orally taken the 25% alcohol and 50% alcohol by 5g per Kg of weight during 3 weeks after the adjusting period. For the energy balance, 85% sucrose and 45% sucrose was added in control group and 25% alcohol group each. The weight was reduced by alcohol treatment according to the levels, otherwise the weight of liver and heart was little increased in alcohol groups rather than in control without significance. Moreover, RBC, WBC, hemoglobin and hematocrit were increased by alcohol treatment according to the levels without significance. Otherwise, adjusted bilirubin levels by 100g of weight was significantly increased by alcohol treatment dose dependently. Alcohol induced RBC degradation and increased circulated bilirubin because of liver damage. For blood lipid profiles, blood cholesterol was increased in 50% of alcohol group compared to that of 25% and control groups, otherwise, blood triglycerides (TG) was increased by 30% in 25% alcohol groups rather than in control but not significantly different. The hepatic lipid composition, cholesterol levels in alcohol treatment groups was lower than those in control. The hepatic TG was not influenced by alcohol treatment. The two reasons of decreasing hepatic lipids were suggested by 85% sucrose of control for energy balance more synthesized cholesterol and TG than those in 25 or 50% alcohol groups, and by cholesterol and TG could not be synthesized because of liver damage from alcohol.

수치해석에 의한 복개터널 라이닝의 변위거동

이명욱,박병수,전용배,유남재 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.A

This paper is results of experimental and nunerical works on the behavior of the cut-and-cover tunnel. Centrifuge model tests were performed to simulate the behavior of the cut-and-cover tunnels having cross sections of national road and subway tunnels. Model experiments were carried out with changing the cut slope and the slope of filling ground surface. Displacements of tunnel lining resulted from artificially accelerated gravitational force up to 40g of covered material used in model tests, were measured during centrifuge model tests. In model tests, Jumunjin Standard Sand with the relative density of 80% and the zinc plates were used for the covered material and the flexible tunnel lining, respectively. Basic soil property tests were performed to obtain it's the property of Jumumjin Standard Sand. Shear strength parameters of Jumunjin Standard Sand were obtained by performing the triaxial compression tests. Direct shear tests were also carried out to find the mechanical properties of the interface between the lining and the covered material. Numerical analysis with the commercially available program of FLAC were performed to compare with results of centrifuge model experiment. In numerical modelling. Mohr-Coulomb elasto-plastic constitutive model was used to simulaye the behavoor of Jumunjin Standard Sand and the interface element between the lining and the covered material was implemented to simulate the interaction between them. Compared results between model tests and numerical estimation with respect to displacement of the lining showed in good agreements.

일부 중소병원 조직구성원의 갈등이 직무만족과 조직몰입에 미치는 영향

임경태,강명근,전재두,박계남,김기순 朝鮮大學校 附設 醫學硏究所 2004 The Medical Journal of Chosun University Vol.29 No.1

Objectives and Method : This study was conducted to identify the influences of conflict among hospital employees on job satisfaction and organizational commitment measured as the result variables of organizational conflict. The data for this study were collected from 305 employees who were employed as a physician, a nurse, an administrative personnel or other hcalthcare professional in 4 medium-sized general hopitals in 2 middle sized cities including Yeosu and Soonchcon. The survey instrument used in this study was a structured questionnaire developed from modifying those of some previous studies, for example, Minnesota Satisfaction Questionnaire for a measure of job satisfaction. Results : 1. The groups experienced relatively high degree of overall intra- organizational conflict were the female, the younger, the non-married or the divorced married, and the college-graduated. And according to the job-related variables, these groups were the lower-salaried employees with a lower job status, 3 or 5 years on their duties, especially the nurses. 2. The degree of conflict experienced by the hospital employees was highest in the intra-organizational conflict due to the factors such as a gap of goals, communication problems and were relatively lower in the conflict due to the factors such as a collective coherence, an interdependence, a leadership problem. And the degree of conflict due to the horizontal relationship with their colleagues was higher than that of vertical relationship with their bosses or subordinates. 3. Comparcd with the degree of conflict according to the general characteristics of our study subjects, the degree of job satisfaction and organizational commitment of them were reverse in that the male, the elderly, the married, the eradnated of praduate school, the physicians, and higher-salaried employees with a higher job status, 6 vears or more on their duties perceived the highest degree of the job satisfaction and the organizational commitment. As a result of correlation analysis, all values of correlation coefficients between the degree of intra-organizational conflict and the degree of the job satisfaction, the organizational commitment were negative. 4. As a result of a multiple regression analysis inputting the variables such as variable general characteristics and job-related variables as the putative confounders, the conflict scores due to the factors such as the communication problems, leadership problems, individual personality were the significant independent variables having negative influence on the overall, intrinsic, and extrinsic components of job satisfaction. 5. As a result of a multiple regression analysis inputting- the variables such as general characteristics and job-related variables as the putative confounders, the conflict scores due to the factors such as an interdependence, leadership problems, and an individual personality were the significant independent variables having negative influence on the score of organizational commitment. And as a result of a multiple regression analysis inputting scores of conflict factors, scores of conflict types, intrinsic and extrinsic components of job satisfaction, and above putative confounders altogether as independent variables, the significant independents having influence on the score of organizational commitment were conflict scores due to the interdependence (β=-0.379; p=0.026), the individual personality (β=-0.716: p=0.000), conflict score from vertical interpersonal relationships (β=-0.555; p=0.019), intrinsic (β=0.097; p=0.000) and extrinsic (β=0.076: p=0.049) components of job satisfaction. Conclusion : Our research had some limitations, which, for example, were an omitting some job related putative confounders such as a daily work loading measured by an individual. But the fact that all the regression models showed hig'h explanatory power suggested the bias due to this problem might be little. And we hope to be conducted more advanced researches with robust theoretical background and precise analytic tools, in this research area.

다시마 추출액의 점성과 향미 개선을 위한 볶음처리 조건

김나미,박명한,전병선,박채규,양재원 한국식품영양학회 1999 韓國食品營養學會誌 Vol.12 No.5

다시마 추출액의 향미와 물성을 개선하기 위하여 볶음처리에 의한 품질변화를 조사하고 최적 볶음조건을 선정하였다. 추출액의 상징액율과 고형분수율 및 조단백질 수율은 볶음온도와 시간이 증가할수록 높아졌다. Algin의 함량은 볶음온도 175℃에서 가장 높았고,회분의 함량은 볶음온도가 증가할수록 많아졌다. 추출액의 점도는 볶음온도와 시간이 증가함에 따라 낮아졌으며 175℃, 10분 볶음처리할 때 점도 감소가 뚜렷하였다. 추출액 의 pH는 볶음온도 150℃까지는 다소 낮아지는 경향이었으며 175℃ 이상의 볶음처리 시 볶음온도와 시간이 증가함에 따라 다소 높아졌다. 볶음온도와 시간이 증가함에 따라 명도(L값)은 감소하였고, 적색도(a값)과 황색도(b값)은 증가하다가 a값은 200℃ 15분처리, b값은 175℃, 30분 처리 이후에서 각각 감소되기 시작하였다. 다시마 추출액의 냄새는 175℃에서 볶음처리하였을 때 고소한 냄새가 크게 증가하고 메스꺼운 냄새가 뚜렷하게 감소되어 전체적인 기호도가 가장 높았다. 구수한 맛과 해조맛은 175℃에서 고소한 맛이 증가되면서 메스꺼운 맛이 뚜렷하게 감소되었고 200℃ 이상에서는 탄맛이 많아져 전체적인 맛의 기호도는 175℃에서 가장 좋은 것으로 평가되었다. 이상의 결과를 종 합하여 볼 때 다시마를 175℃에서 10분간 볶음처리하는 것이 다시마 추출액에서 좋지 않은 향미를 개선하고 점성을 감소시키기에 적합하였다. Roasting conditions for improvement of viscosity and sensory properties of sea tangle extracts were investigated. The supernatant %, solid yield and crude protein yield were increased by increasing of roasting temperature and times. The highest contents of algin was obtained in roasting temperature of 175℃, ash contents were increased by roasting temperature increasing. Viscosities of sea tangle extract were significantly decreased by increasing of roasting temperature and time upto 175℃ and 10 mins more than further roasting conditions. The pH of sea tangle extracts slightly decreased from 5.94 to 5.83 in the roasting of 150℃, however, at temperature more than 175℃, its pH was increased by increasing of temperature and time. According to increase of roasting temperature and time, Lightness (L value) were significantly decreased and redness (a value) and yellowness (b value) reached the highest value in the roasting of 200℃, 15 min. or 175℃, 30 min. and after that, its value were decreased. The odor characteristics showed that sea tangle extract prepared by roasting of 175℃, 10 min. was significantly low in intensity of nauseous odor and high in intensity of roasted odor and acceptability. The taste characteristics showed that sea tangle extract prepared by roasting of 175℃, 10mins was slightly reduced in intensity of savory and seaweed taste but significantly low in intensity of nauseous taste and high in intensity of roasted taste and acceptability. Overall data suggested 175℃, 10 min. was the most effective roasting conditions for improvement of viscosity and sensory properties of sea tangle extract.

單相 4象限 CONVERTER 運轉

박종덕,심재명,김영달,전승구 大田産業大學校 1996 한밭대학교 논문집 Vol.13 No.0201

In this paper, I have studied basic theory about the operation of single phase four-quadrant converter using MOSFET and theoretical study and efficient operation domain about each mode which is the operation of DC power mode and AC power mode. Especially I have done computer simulation about harmonic problems in conversion AC power and analysed this problem through the experiment. MOSFET in the converter has been used to make switching speed so fast for the purpose of decreasing lower harmonics in PWM. On the other hand, I have studied power-regeneration by experiment to convert 60Hz AC.

여러 가지 식품첨가제에 의한 Algin 용액의 유동 특성

김나미,박명한,전병선,박채규,양재원 한국식품영양학회 1999 韓國食品營養學會誌 Vol.12 No.2

알긴을 액상제품에 이용하기 위하여 algin의 농도와 수용액의 pH, 온도 변화에 의한 algin의 유동특성과 산미제, 감미제, 기타 첨가물이 algin의 점성에 미치는 영향을 조사하였다. 알긴 용액은 회전속도가 동일할 때는 농도가 높을수록 점도가 증가하였고 0.4% 농도까지는 dilatant형, 0.5% 이상에서는 pseudoplastic형 유체의 특성을 나타냈다. 알긴 용액의 pH가 5.5일 때 점도가 가장 높았고 pH 5.5 이하에서는 산성일수록 점도가 낮아졌으며, pH 7.0 이상에서는 점도의 변화가 없었다. 온도가 낮을수록 점도가 높았고, 가열함에 따라 용해시간이 단축되었으며 80℃이상의 가열에 의하여 점도가 다소 낮아졌다. 산미제에 의해 알긴의 점도는 pH 의존적으로 pH 3.2∼3.3에서 점도가 가장 낮았고 pH 3.0 이하에서는 gel이 형성되었다. 감미제는 알긴 용액의 점도에 영향을 주지 않았다. 무기염류 중 NaCl과 KCl은 점도를 감소시켰으며 MgCl_2와 CaCl_2는 점도를 증가시켰고, FeCl_3 첨가는 점도 증가효과가 커서 0.1% 첨가에 의햐여 gel이 형성되었다. 아미노산 중 glutamic acid는 1.0% 첨가 시에 점도 감소효과가 있었으며 다른 아미노산은 변화를 나타내지 않았다. In order to obtain data for use of algin in drink making process, solution properties of algin have been investigated at various condition of algin concentration, temperature, pH and various food additives. At same revolution velosity, viscosities of algin were increased as algin concentration raised. Algin solution showed dilatant type flow in concentration of 0.25% to 0.4%, but pseudoplastic type flow in above 0.5%. A maximum viscosity of algin was observed at pH 5.5 ad its viscosities were also decreased as the temperature increased and heating at 80℃ above. Organic acids affected on the viscosity of algin with pH dependently, and gel formed in pH below 3.0. Sweetners have no effect to the viscosity of algin. However, addition of NaCl and KCl upto 1.0% decreased a little its viscosity and CaCl_2, MgCl_2 and FeCl_3 increased the viscosity of algin. Glutamic acid decreased the viscosity of algin.

양측 하악과두 골절에 대한 관혈적 정보술후 나타난 근약화와 시력장애 : 증례보고

정기훈,신용길,김태열,신재명,윤규호,전인성 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.6

The condylar fracture show high occurrence rate in the following of symphysis and angle, because it is easy to have concentration of outer pressure due to its long and narrow anatomical shape and mouth opened state when trauma is attacked. For the clinical findings, there are trismus, opening deviation, mal-occlusion and open bite The classification of condylar fracture is varied due to the location of condylar bone fragment, fracture site. There are conservative and surgical methods for treatment modalities. Because of many advantages, conservative method is widely used it has no particular limits of treatment adjustment but the cases of absolutely surgical correction indication are easily found in clinical experience. Although many methods are suggested for treatments of condylar fracture, there are no particular surgical methods for precise reduction due to difficult accessibility in high condylar neck fracture. For precise reduction of condyle, we used Nam's method. However, in Nam's method, because condyle is fixed when once it is kept off externally reduced in avascular state, so complication such as condyle resorption is pointed out as a problem. In our clinic, we obtained some knowledge by treating a patient who had muscle weakness and vision disorder after temporary airway obstruction follownig the both condylar fracure operated using Nam's method, so here we reported the case with a study of documents.

흰쥐에서 염화비닐 폭로수준에 따른 소변내 thiodiglycolic acid 농도의 변화

왕승준,차봉석,노재훈,신동천,김명수,전근재 大韓産業醫學會 1999 대한직업환경의학회지 Vol.11 No.4

Objectives : It is the objective of this research to identify the variation of thiodiglycolic acid(TdGA) in urine with vinyl chloride monamer(VCM) exposure levels through methylation. Methods : After rats were exposed to vinyl chloride monomer of 4 levels, 0㎎/㎥, 50㎎/㎥, 150㎎/㎥, 500㎎/㎥, respectively, of which urine was sampled in each sampling time of 0 hour, 2 hours, 4 hours, 8 hours, 16 hours, 36 hours, 48 hours. After urine had been methylated with diazomethane in the preliminary experiment and the peak of 146 m/z had been verified, the main experiment was done. Results : In the variation of TdGA with sampling times, concentration of TdGA increased rapidly in 4 hours and then decreased after 8 hours. When the variation of urinary TdGA concentration in urine according to exposure level of VGM was verified through Kruskal-Wallis statistical method at each sampling time, the significant increment with the exposure levels at 2 hours, 4 hours, 8 hours after exposure was clarified. Conclusion : TdGA concentration in urine with increment of VCM exposure level increased, especially significantly at 2 hours, 4 hours, 8 hours of sampling time.