計測機器 硏究開發 戰略에 관한 硏究

최만용,윤석기 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.1

In the past few decades, the measuring instrument industries have made rapid progress with increase of the demand in industries such as precision instrument, chemistry, electronics, industrial measurement and automobile. Thus, development strategy and technical advancement are required for both securing the competitiveness of products in the world market and industrial development. Intensifying competitiveness of measuring instrument is needed in the world market. It can be achieved by development of measuring instrument holding comparative priority. A development strategy should be drawn up in the long-term point of view for coping with the increasing demand of measuring instrument and securing competitiveness in the world market.

단무지 공장에서 발생한 질식 사고의 원인과 방사선학적 소견: 중례보고 및 가스분석 결과

박충기,김만구,김흥철,안범규,박만수,황우철,최철순,강익원 江原大學校 附設 環境硏究所 1994 環境硏究 Vol.11 No.-

목 적:단무지 공장에서 질식사고를 일으켰던 가스의 종류를 알아내고, 이러한 가스중독의 방서선학적 소견을 소개하기 위하여 본 연구를 하였다. 대상 및 방법:단무지 공장에서 발생한 질식 사고자 3예중 생존자 1예를 대상으로 단순흥부X-선검사와 CT 소견을 분석하였으며, 가스의 종류를 알아내기 위하여 단무지를 유리병에 넣어 발생된 가스를 가스크로마토그래픽을 이용하여 분석하였다. 결 과:단무지 공장에서 발생한 질식사고자중 생존한 1명의 방사선학적 검사에서 신속히 호전되는 폐경결(consolidation)을 볼 수 있었으며 이는 폐부종의 소견임을 알 수 있었다. 협기성 상태에서 단무지를 담은 유리병의 상층부 가스를 실험 분석한 결과 이산화탄소, 에칠알코올이 다량으로 검출되었으나 독성가스는 주로 황화수소이였다. 결 론:단무지 공장의 질식 사고자에서 폐방사선학적 소견은 폐경결을 보이는 폐부증으로서 이는 실험을 통해 단무지에서 발생되는 유독가스인 황화수소 때문임을 입증하였다. Purpose: To identify the main toxic gas released from salted radish in rice bran(Dan-M-Ji) and to introduce the radiological findings of the patient who was exposed to the gas. Materials and Methods: Chest radiographs and CT scans of one survivor among three men who were exposed to the gas from Dan-Mu-Ji were reviewed. Gas obtained from the closed bottle containing Dan-Mu-Ji was analized by using the gas chromatography. Results: The radiographlc examinations of the survivor were suggestive of pulmonary edema with it's rapidly improving consolidations in both lung. The headapace gas within the bottle containing Dan-Mu-Ji was mainly composed with carbon dioxide, ethyl alcohol and hydrogen sulfide, of which hydrogen sulfide was considered the main toxic gas released. Conclusion: Under the anaerobic condition, Dan-Mu-Ji released toxic hydrogen sulfide. Inhalation of hydrogen sulfide might produce non-cardiogenic pulmonary edema.

과실 비파괴 검사용 초음파 트랜스듀서 개발

김기복,김만수,이상대,최만용 한국비파괴검사학회 2004 학술대회 논문집 Vol.- No.-

In this study, the ultrasonic transducers for contact measurement of whole fruits were developed. The design parameters for ultrasonic transducer such as acoustical impedance of fruits, kinds of piezoelectric materials, ultrasonic wave frequency, and transducer diameter were investigated. In order to match the impedance between piezoelectric material and fruit, various wear plates were fabricated and evaluated. And to control the bandwidth of ultrasonic wave of the transducer, various backing materials were fabricated and evaluated. The wear plate of the transducer was specially designed and fabricated considering the curvature of fruit. Two kinds of transducers such as 100 kHz of central frequency with 40 mm of transducer diameter and 200 kHz of central frequency with 20 mm diameter were developed. Nondestructive evaluation of the fruit will be possible with the developed ultrasonic transducers.

여성호르몬 대체요법후 체중변화와 베타3 아드레날린 수용체 유전자형의 연관성에 관한 연구

이기호,김상만,이득주,최희정,한인권 대한비만학회 2003 The Korean journal of obesity Vol.12 No.3

연구배경: 폐경 전후에서의 체중 증가와 여성호르몬과의 연관성이 지속적으로 논의되어왔다 교감 신경계는 지방대사를 촉진하여 대사적 열생산을 증가시키는 작용을 가지고 있으므로 이와 관련하여 베타3아드레날린 수용체의 유전자형이 폐경여성에서 여성호르몬 대체요법 이후의 체중증가와 연관이 있는지를 밝히고자 본 연구를 시행하였다. 방법: 1995년부터 2002년 5월까지 삼성제일병윈 비만클리닉 및 갱년기 클리닉에 방문하여 여성 호르몬 대체요법을 시행 받았으며, 폐경에 관련한 과거력, 여성 호르몬 투여 전후의 체중, 체질량 지수에 대한 자료를 확보할 수 있곤, 베타3 아드레날린 수용체 유전자의 다형성을 분석한 92명을 최종 연구 대상자로 하였다. 결과: 베타3 아드레날린 수용체 유전자 다형성 분포는 Trp64Trp형 39.1%, Trp64Arg형 25.0%,Arg64Arg형 34.8%,로 나타났다 여성호르몬 투여 전 체중의 평균은 61.07±7.06이었으며, 여성 호르몬대체요법 후 체중 변화의 평균은 1.28±3.20 증가로 나타났으나, 통계적으로 유의하지 않았다 β3 아드레날린 수용체 유전자 아형에 따른 체중의 평균 변화는 Trp64Trp형에서 1.86±2.94 증가, Trp64Arg형 0.74±2.97 증가, Arg64Arg형 1,00±3.61 증가로 나타났으나 이들 모두 통계적 유의성은 없었으며, 세 아형간의 변화량도 유의하지 않았다. 결론: 폐경여성에서 여성호르몬 대체요법 후 체중이 증가하였으나 통계적으로 유의하지 않았으며, β3아드레날린 수용체 유전자 아형에 따른 차이를 관찰할 수 없었다. Background: The study results to determine the relationship between postmenopausal estrogen use and weight gain have not been consistent. Genetic studies have reported the association of BMI with the beta3-adrenergic receptor gene polymorhism. This study as designed to indentify association of beta3-adrenergic receptor gene polymorhism with weight gain related to HRT in postmenopausal women. Methods: 192 postmenopausal women at a general hospital, Bariatric and climacteric clinic have been collected. Subtypes of beta3 adrenergic receptors were measured and physical, anthropomeric data including body fat and BMI was obtained before and after HRT. Results: Arg/Arg group was 34.8%, Trp/Arg group was 25.0%, Trp/Trp group was 39.1%. Mean weight gain in 192 postmenopausal women was 1.28±3.20 kg and the percent changes in weight gain between initial and final point was 2.32±5.66% but these resulst had no statistical significance (p>0.05). Weight gain(%) were 2.24%(95% C.I 0.35~4.13) in Arg/Arg group, 1.08%(-1.17~3.29) in Trp/Arg group and 3.18%(1.49~4.92) in Trp/Trp, but these results did not show statistical significance(F=1.13, p=0.03). Conclusion: Polymorphism of beta3 adrenergic receptor gene was not associated with weight gain after HRT in postmenopausal women. From these results, we may conclude that polymorhism of beta3 adrenergic receptor may not be the predicting factor to understand the weight gain after HRT in postmenopausal women.

국내 운동역학의 연구동향 고찰

김기운,최종만,박종학 청주대학교 학술연구소 2004 淸大學術論集 Vol.2 No.-

The purpose of this study was to analyzed the theses in The Korean Alliance for Health, Physical Education, Recreation, and Dance from 1993 to 2002 Sep. The results are as following; 1. There was published 154 pieces of studies since 1993, the least these was in 1993, only 1 piece and the largest these was in 2000, 36 pieces. 2. The current of studies by the kind of sports were showed by land sports(23 pieces), gymnastics, walking and Taekwondo. 3. The characteristics of the participants were 98 good players the most amount and was studied equally in 2000. 4. There were 115 in 20 ages which was showed the most ratios, and 2 young children. 5. The method was accomplished by video taping was 64 pieces and high-speed camera was 57 pieces and program developing was 8. 6. It was studied by using video camera, high-speed camera, motion tracing equipment, direct electromagnetic tracing equipment, MRI and X-ray. To improve the studies of Biomechanics area it must be accomplished by many kinds of sports and participants, connected with other studies to avoid the players injury by using simulation. It means that the study should be reflected by our daily life not study.

중학교 남자 테니스 선수의 운동기능수준별 시합 전 경쟁상태불안

남인수,최인태,전중기,윤재만,고성경,이종삼,임승현 대구대학교 인문과학연구소 2008 人文科學硏究 Vol.31 No.-

The purpose of this study was to investigate if there is any difference in the level of competitive state anxiety according to the level of motor skill before the game and to provide the players with basic data for the mental practice. The subjects of this study consist of 20 men's a middle school tennis players. The experimental group was divided into superior players group and inferior players group. And then by using a CSAI-2 questionnaire, three subfactors of competitive state anxiety, or cognitive state anxiety, somatic state anxiety and state self-confidence were measured. The method of measurement was carried out three times, or one week, one day and two hours before the game. The results of this study were as follows. First, About both cognitive state anxiety and somatic state anxiety, inferior players were significantly higher than superior players. Second, About state self-confidence, superior players were significantly higher than inferior players. Third, As the game was around, both cognitive state anxiety and somatic state anxiety which all the players including superior and inferior players had increased. But the state self-confidence of all players decreased.

폐결핵 환자의 우울 상태

홍정표,최선희,조만종,이성주,박종,김기순,김양옥 朝鮮大學校 附設 醫學硏究所 1997 The Medical Journal of Chosun University Vol.22 No.1

The main purpose of this study is to identify and evaluate the depressive states for the patients with chronic pulmonary tuberculosis. A questionnaire(Self-rating Depression Scale, SDS) survey was performed toward 57 pulmonary tuberculosis patients with initial treatment who started chemotherapy and 53 pulmonary tuberculosis patients with retreatment, admitted to one tuberculosis-centered hospital and two general hospital. Fifty three healthy persons as control group were investigated with the same questionnaire for comparison. The survey was performed from July to August 1996. The results are as follws : 1. The patients had significantly high scores in the depression than control and the patient with retreatment showed significantly high scores in the depression than the patient with initia1treatment(P<0.01). 2. The depressive levels of the patients were associated with duration of admission and the expectancy of recovery (P<0.05). 3. The percentage of the subjects with 40 or more scores tentatively classifiable as psychologically depressed was 67.1% of the total subjects, 48.4% of the control groups, 75.0% of the patient with initial treatment and 84.1% of the patient with retreatment. Because patient with pulmonary tuberculosis with initial treatment showed higher depression scores than normal persons, and patients with retreatment due to failure of initial treatment showed higher depression scores than initial treatment, it is necessary to give attention to depression of the patients during treatment of pulmonary tuberculosis.

잡음환경에서 구름 볼 베이링의 결함검출을 위한 ALE의 적용

김영태,최만용,김기복,박해원,박정학,김종억,류준 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

It is very important to detect the bearing defects in rotating machinery since the critical failure of bearing cause a machinery shutdown. However it is difficult to detect the vibration signal resulting from the initial defects of bearing because of the high level of broadband noise. A signal processing technique, called the adaptive line enhancer(ALE) as one of adaptive filter, is studied in this work. This technique is to eliminate broadband noise without a prior knowledge of the noise and signal characteristics. Also we propose the optimal methods for selecting the three main ALE parameters such as correlation length, filter order and adaptation constant used in the adaptative process. Vibration signals for three abnormal bearings, including inner and outer raceways and ball defects, were acquired from Anderon(angular derivative of radius on)meter. The experimental results showed that the proposed technique can reliably detect the bearing defective signals masked by broadband noise.

배열형 전력 MOSFET의 설계 및 제작

김진형,최연익,정상구,박찬광,김충기,성만영 亞洲大學校 1987 論文集 Vol.10 No.-

In this paper, the design of the array type power MOSFETs is discussed in terms of on-resistance, breakdown voltage, placement of FLRs(field limiting ring) and threshold voltage. Also, 9-cell(square-on square grid) VDMOSs are fabricated to confirm the feasibility of the design method. Existence of optimum p-well spacing for minimum on-resistance, which is anticipated by the theoretical results is confirmed by the experiment of the fabricated power MOSFETs. Breakdown voltage of power MOSFET is upgraded by using two FLR's and their optimum placement is determined from the experimental results of the diodes with FLRs. The threshold voltage is controlled by the ion implantation within the design specification. Experimental results are in good agreement with the design specification. Experimental results are in good agreement with the design values. Characteristics of the fabricated power MOSFETs are 190Ω in on-resistance, 270V in breakdown voltage and 2.9V in thershold voltage.

볼 베어링의 결함검출을 위한 Adaptive Line Enhancer의 적용

김영태,최만용,김기복,박해원,박정학,김종억,류준 한국공작기계학회 2005 한국생산제조학회지 Vol.14 No.2

The early detection of the bearing defects in rotating machinery is very important since the critical failure of bearing causes a machinery shutdown. However it is not easy to detect the vibration signal caused by the initial defects of bearing because of the high level of random noise. A signal processing technique, called the adaptive line enhancer(ALE) as one of adaptive filter, is used in this study. This technique is to eliminate random noise with little a prior knowledge of the noise and signal characteristics. Also we propose the optimal methods for selecting the three main ALE parameters such as correlation length, filter order and adaptation constant. Vibration signals for three abnormal bearings, including inner and outer raceways and ball defects, were acquired by Anderon(angular derivative of radius on) meter. The experimental results showed that ALE is very useful for detecting the bearing defective signals masked by random noise.