싸이리스터 PWM정류기를 이용한 유도가열장치

崔泳道,李景彬,韓炳文 明知大學校 産業技術硏究所 2002 産業技術硏究所論文集 Vol.21 No.-

This paper proposes a new induction heating system composed of a thyristor PWM rectifier with a resonant commutation circuit. The operation of proposed system was first analyzed by a theoretical approach with equivalent circuits. And its verification was performed by computer simulations with EMTP. The proposed system can provide a solution for the power factor problem of the existing high-power induction heating system, which uses the line-commutated thyristor bridge in rectifier side.

간호과정의 적용과 전통적 임상실습 적용 학생간의 Progress note에 대한 비교 연구

崔榮熙,毛慶嬪 梨花女子大學校 韓國生活科學硏究院 1977 韓國生活科學硏究院 論叢 Vol.19 No.-

환자에게 보다 안전하고 효율적이며 개별화된 간호를 시도하는 데 있어 문제 해결 방법인 체계적인 간호과정의 필요성이 강조되어 왔다. 본 연구는 체계적 간호과정을 임상교육에 적용하는 그룹은 간호과정을 보다 잘 이해하고 적용하기 때문에 환자 기록에 있어서도 더 상세하고 체계적인 기록을 할 것이라는 점과 상세하고 체계적인 정보는 개별화된 간호화 문제 해결을 중심한 학습 경험이 될 것이라는 점을 밝히고자 1976년 6월 이미 체계적 간호과정을 시도하고 있는 간호학과 3학년 그룹과 체계적인 간호과정을 적용하지 않는 전통적 실습교육을 시도하고 있는 간호학과 3학년 그룹으로서 두 그룹 모두 성인 간호 분야에서 14주간 실습을 마친 학생 25명씩을 임의 선정하여 Bertucci 등에 의한 평가도구를 사용했다. 이 평가도구는 환자 간호에 대한 5가지 상황(담낭 적출, 심근경색증, 뇌출혈, 척수손상 및 당뇨병)으로 되었고 주관적 정보, 객관적 정보, 문제 확인, 직접 간호활동과 계획 및 간접 간호활동과 계획으로 구성된 5가지 평점기준에 의해 기록을 평점했다. 자료 처리에 있어서는 대상자의 상황별 두 그룹간의 평점 항목간의 차의 유의성을 검정했으며 결과는 다음과 같다. (1) 담낭적출 환자(상황Ⅰ)에서 실험군은 주관적 정보를 잘 파악하여 두 그룹간의 유의한 차이를 보였다(p<0.05). 반면 대조군 경우 객관적 정보를 잘 파악하여 그룹간 유의성을 보였다(p<0.05). 5가지 항목을 통해 볼 때 두 그룹 모두 문제 확인의 평점이 저조하였다. (2) 심근경색증 환자(상황Ⅱ)에서는 그룹간의 유의한 차이가 없었다(p<0.05). 5가지 항목을 통해 보면 두 그룹에서 모두 문제 확인과 간접 간호활동의 수행이 저조하였다. (3) 뇌출혈환자(상황Ⅲ)에 대조군은 직접 간호활동을 보다 잘하였다(p<0.05). 항목별 평점에서는 문제 확인과 간접 간호활동이 두 그룹 모두 저조하였다. (4) 척수손상 환자(상황Ⅳ)에서 실험군은 주관적 정보에서 우수하여 유의한 차를 보였고(p<0.05), 대조군에서는 간접 간호활동이 우수하여 그룹간의 유의한 차를 보였다(p<0.05)항목별 평점에서는 문제 확인 항목이 가장 저조하였다. (5) 당뇨병 환자(상황Ⅴ)에서 실험군은 주관적 정보에서 우수하여 유의한 차를 보였다(p<0.05). 항목별 성적은 문제 확인에서 두 그룹 모두 저조하였다. 이상의 5가지 상황을 통하여 항목별 그룹간의 차를 비교해 보면 실험군은 주관적 정보를 잘 찾아냈고(p<0.05), 대조군은 직접 간호활동을 더욱 잘하여 유의한 차를 보였다(p<0.05). 또한 실험군의 경우 이론을 배우고 실습을 했던 척수손상 상황에서 실습만을 했던 대조군에서 보다 좋은 성적을 보여 그룹간의 유의한 차를 보였다(p<0.05). 이에 반해 대조군의 경우 이론을 배우고 실습을 했던 당뇨병 상황에서 이론을 배우지 않고 실습을 했던 실험군과의 사이에 유의한 차를 보이지 않았다. This study was conducted to provide a appropriate clinical learning experiences for the students who could be capable of applying Nursing process in the field of clinical setting and a scientific, systematic, and humanistic nursing care for the patient, family, and community. In this study that compared the quality of progress notes obtained by problem oriented methods in Nursing process and traditional methods of charting in the student's nurses notes, two samples of student nurses, 25 in each groups were similar in clinical experiences and curriculum, but in educational institution. The assessment tool consisted of five patient situations considered common in medical-sugical units. The student nurses were instructed to react to each situation by writing nurses notes as though they were actually assigned to care for the patient. Five scoring criteria were used to evaluate the student nurses notes. Individual responses for each patient situation were abalysed and a score of one was given for each criterion included. Individual scores were totaled. The mean and standard deviation for each criterion were obtained for both groups. The .05 level of significance was specified for difference between two groups and five criteria The results were: (1) On the situation one in case of postcholecystectomy, mean values of the subjective data were revealed significant difference with experimental group showing higher mean value in subjective data(P<0.05), while with control group showing higher mean value in obyective data(P<0.05). Through the five scoring criteria, there were a lowest performance in criteria of assessment in both groups. (2) On the situation two in case of myocardial infarction, there were no statistically significant difference through the five scoring criteria and between group. But between two groups, there were also lowest performance in criteria of Indirect Intervention and plan in both groups. (3) On the situation three in case of cerebral hemarrhage, control group were revealed significant difference in criteria of direct intervention and plan(P<0.05). Criteria of assessment and Indirect Intervention and plan were also revealed lowest result in both groups. (4) On the situation four in case of spinal cord injury, mean value of the subjective data and assessment were revealed significant difference at the level 0.05 with experimental group showing higher mean value(P<0.05). While mesn value of the indirect intervention and plan were revealed significant difference with control group showing higher mean value(P<0.05). (5) On the situation five in case of diabetis mellitus, mean value of the subjective data were reveled significant difference at the level of .05 with experimental group showing higher mean value (P<0.05). Criteria of assessment has also showed lowest performance in both groups. (6) The difference between mean value of experimental and control group were revealed significant at level .05 in criteria of subjective data (P<0.05). While in criteria of objective information in control group were revealed significant (P<0.05). (7) The experimental group already had learned the spinal card injury in the class showed significant difference in progress note(P<0.05). While the control group had learned the diabetis mellitus in the class did not show significant difference in progress note.

구속운동을 받는 외팔보의 혼돈진동

최봉문,류봉조,윤충섭,임경빈 大田産業大學校 2000 한밭대학교 논문집 Vol.17 No.1

When the motion of vibrating structure is restrained by the adjacent objects, its vibration frequencies and mode shapes are changed. In general, the vibration characteristics of the system becomes unpredictable. Although the importance of the study on this type of vibration model increases in many engineering areas, most studies conducted to date were focused to the theoretical study on dynamic responses of the structure with stops, including a few experimental works. Specially, the study on the nonlinear phenomena due to the impact between a structure and stops have been mainly performed theoretically. It is, therefore, desired to find a way to have a better understanding on the vibration characteristics caused by the impact of a structure to stops. In the paper, both numerical analyses and experiments are conducted for a fixed-free beam that is restrained by the stops at the free end. The chaotic vibration characteristics of the nonlinear motion and the dynamic response of the system are investigated and presented for various magnetic forces between stops.

一部 農村地域 住民의 여름철 營養攝取狀態에 대한 調査

崔京子,宋東彬,李幸子,李成東 高麗大學校 倂設 保健大學 保健科學硏究所 1985 保健科學論集 Vol.14 No.1

In order to obtain basic information on nutrient intake of residents in rural community during the summer that can be used as reference material for making health policy in the future, a three day survey has been conducted at Jeomdong-Myun, Yeoju-Gun, Kyunggi province which is the pilot project area for the project implemented by the Community Health Development Committee, Korea University. The sample size was 46 households and the major findings were as follows; 1. The number of foods they were taking totalled 16 categories and 152 kinds. 2. Average amount of daily intake was 1,124 grams per person of which 93% was vegetable food, and animal food occupied only 7%. Amongst the animal foods, the intake amount of fishes and milk was lower than the national average. 3. The nutrient intake except fatty substance and calcium, namely protein, carbohydrate, phosphorus, iron and vitamines, was exceeding the recommended daily allowance for adult. The same fact was also found in terms of the total calorie intake. 4. The problems on the nutrient intake arisen from the study in this area were; a. The proportion of animal protein occupies 24% of the total protein intake whereas the national average of rural community stood at between 32.5%∼33.5% as a results of 1981∼1984 National Nurition survey. b. Insufficient intake of fat and oil, and c. Calcium intake occupies only 72% of the recommended daily allowance and 84.5% of the calcium intake was depending upon vegetable, which has a low absorbability. As described above, the intake of animal protein, fatty substance and calcium was low because of the high dependency on vegetable food in this community.

표면위에 분사되는 원형 충돌제트의 열전달에 관한 실험적 연구

임경빈,최상경,송시영 한밭대학교 생산기반기술연구소 2001 생산기반기술연구소 논문집 Vol.1 No.1

The heat transfer characteristics on curved surfaces with an obliquely impinging circular jet were studied. In this study, the flat plate and hemispherically convex and concave surfaces were used. The Reynolds number used was Re=23,000. The nozzle-to-surface distance was L/d=4, 6 and 8. The jet angle was α=0˚ and 30˚. As the results of this study, the Nusselt number at the stagnation point decreases as the jet angle increases and has the maximum value for L/d=6. The secondary maximum Nusselt numbers in the downstream direction occur at long distances from the stagnation point as the jet angle increases or the nozzle-to-surface distance decreases. The Nusselt number distributions exhibit a displacement of the maximum heat transfer from the stagnation point to the upstream direction.

치아 우식부의 기계화학적 제거 효과에 대한 연구

임순빈,최경규,박상진 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.3

Mechanical removals in decayed teeth have been performed using drill and sharp hand instruments. These methods have some disadvantages such as pain, local anesthesia and overextended cavities Therefore chemo-mechanical excavation of dentin carious lesions has been introduced. The purpose of this study was to evaluate the efficacy of traditional mechanical methods using burs and chemo-mechanical methods (Carisolv) of caries dentin. Mechanical caries removal was carried with low speed round bur Chemo-mechanical caries excavation was performed with Carisolv (Medi-team), using the Carisolv hand instruments. The mean time to remove caries with two different methods was evaluated and the data analyzed with SPSS software (ver 11.5) by t-test (p < 0.05). For histomorphometry of caries removal were also carried with mechanical or chemo-mechanical (Carisolv) methods from 20 extracted caries permanent molars. Complete caries removal was verified with a #23 sharp explorers, Caries Detector (Kuraray Co. Japan), and standard apical radiography. 1. Chemo-mechanical method was taken more times than mechanical method (1.5 fold) (p < 0.05) 2. Excavation for caries took more time for molar lesion than premolar lesion, and the least time was taken to remove the caries in incisor lesion (p < 0.05). 3. There were no significant differences to remove the caries between the maxilla and mandible (p > 0.05). 4. The remaining carious dentin was detected after the ckemo-mechanical removal of the carious dentin, and no smear layer were seen after the mechanical and chemo-mechanical removal of the carious dentin. 본 연구는 우식의 기계적 제거와 기계화학적 제거의 효과를 비교, 평가하고자 하였으며, 기계적 제거방법은 저속의 round bur로, 기계 화학적 제거 방법은 Carisolv로 우식을 제거한 후, 잔존 우식을 확인하여 소요시간을 측정하였고, 또 실험실에서 발치한 우식 대구치 20개를 위 두 가지 방법으로 우식을 제거 후, Villanueva bone stain액으로 염색하고 표본을 제작 후 관찰하여 다음의 결론을 얻었다; 1.우식제거에 평균소요시간은 기계화학적 제거가 기계적인 제거보다 1.5배 더 길게 나타났다 (P < 0.05). 2, 우식제거에 평균소요시간은 소구치보다 대구치에서 더 길었고, 전치에서 가장 적은것으로 나타났다 (P < 0.05) 3. 상 · 하악에서는 차이가 없었다 (P > 0.05) 4. 기계화학적 방법으로 우식 상아질을 제거 시 잔존 우식 상아질이 관찰되었으며 두 방법 모두 우식 상아질을 제거한 표면에서는 도말층을 관찰할 수 없었다.

내부 열경계조건을 고려한 채란 계사시설의 수치해석적 연구

임경빈,최상경 한밭대학교 산업과학기술연구소 2001 논문집 Vol.5 No.-

In this paper, the numerical study to predict air flow patterns and thermal environment characteristics in a window-less laying hen house was performed. The numerical model of this study was calculated with parameter for inlet velocity, inlet temperature reflecting upon interface thermal boundary condition. With 2.5% error, the calculated temperature distributions was predicted very well. Numerical results show that the case of 20∼23℃ inlet temperature with 7 ㎧ inlet velocity was better thermal environment condition. The results of this numerical study reflecting upon interface thermal boundary condition will be very useful for predicting thermal environment characteristics in laying hen house.

흄후드 내부의 유동장에 관한 수치적 연구

임경빈,최상경 한밭대학교 생산기반기술연구소 2001 생산기반기술연구소 논문집 Vol.1 No.1

A three-dimensional model for flow inside a fume hood enclosure with separating plate was developed and numerical computations were carried out to explore the flow pattern and possible path of contaminant transport under different operating conditions of the hood. The face velocity was maintained constant at its exhaust velocity value of 9.0 ㎧. The flow pattern and its contamination field for different window openings and shape of separating plate were studied. The result showed that with an increasing of the window opening, the velocity becomes slower and the recirculation region decreases. The results also showed that contamination performance in case of hood with separating plate was better than that without separating plate.

도시쓰레기를 통과하는 공기의 압력손실에 관한 연구

이세균,최경빈 충북대학교 건설기술연구소 2004 建設技術論文集 Vol.23 No.1

An experimental study on the pressure losses of air through the municipal solid wastes, either dry or wet, has been carried out in this study. Generally the pressure loss increases as the air velocity and depth of solid wastes increase. However, there are some unexpected phenomena for the dry wastes with high air velocity and low depth due to the strong floating effects of solid wastes. Such effects are also shown in wet wastes when the moisture content is not sufficiently high. The results of this study are useful in designing the dimension of second combustion chamber of multi-stage combustion incinerator.

PLT 절연층을 이용한 ZnS:Mn TFEL소자의 제조 및 특성

박욱동,박경빈,박재현,김영진,최병진,김기완 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1

Thin film electroluminescent(TFEL) device has been fabricated using ZnS:Mn phosphor and PLT insulator. The ZnS:Mn and PLT thin film for TFEL device was deposited by vacuum evaporation method and RF magnetron sputtering method, respectively. The TFEL device using ZnS:Mn(6000 Å) and PLT(1000 Å) thin films showed the threshold voltage of 50 Vrms at the driving frequency of 3 kHz. The brightness of TFEL device was 250 μW/cm^(2) at the applied voltage of 74 Vrms. Also the output current of TFEL device was linearly increased with applied voltage.