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- 저자 : 여인식(In-sik Yeo) (검색결과 6 건)
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측두하악장애 치료결과의 예측에서 사회심리학적 요인의 영향
여인식,한경수,김윤희,Yeo, In-Sik,Han, Kyung-Soo,Kim, Yun-Hee 대한안면통증구강내과학회 2005 Journal of Oral Medicine and Pain Vol.30 No.4
The purpose of this study was to investigate the sociopsychological factors which might influence the course of the temporomandibular disorders and to develop models for prediction of treatment outcome related to pain, dysfunction and sound. For this study, 268 patients with temporomandibular disorders were selected from the patients presented to department of Oral Medicine, Wonkwang university dental hospital. Chief complaints of these subjects were largely grouped into three categories such as pain, dysfunction and sound, and 10 cm visual analogue scale(VAS) was used to record the state of the three complaints every visit and Treatment Index(VAS TI) was calculated from VAS. All the forty-two items obtained from clinical examination or questionnaire were statistically processed with $SPSS^{(R)}$ windows. The results of this study were as follows: 1. The items showed a difference between male and female subjects were maximum mouth opening, palpation score, jaw jerk during mandibular movement, and sleep disturbance. Among questionnaires such as SRRS, HAD scale and PSQI, the HAD scales showed the most highly significant correlation with the each scale item of the SCL-90R. 2. Among the groups classified by VAS TI, the group with the lowest VAS TI showed the highest VAS score in the start of treatment but showed the lowest score in the end of treatment, without respect to the type of chief complaint. From these results, it is assumed that the active treatment duration for the subjects with lower VAS score in the first visit would be longer than the subjects with higher score with the somewhat poor treatment outcome. 3. With regard to all the three complaints, the items showing significant effect in the model for prediction of treatment outcome were from questionnaire, except one item, maximum mouth opening, which suggest that the sociopsychological factors would be strongly related to development and progress of the symptoms.
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10/350㎲ 서지전류의 크기와 인가횟수에 따른 바리스터의 제한 전압 특성 고찰
여인식(In-Sik Yeo),고영민(Young-Min Ko),김동진(Dong-Jin Kim),김영선(Young-Sun Kim),이기식(Ki-Sik Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
본 논문은 ZnO 바리스터에 10/350㎲ 서지전류를 인가하였을 때 서지전류의 크기와 인가횟수에 따른 바리스터의 제한 전압에 미치는 영향에 관한 것으로 동일한 사양의 시료에 서지의 크기를 다르게 하여 바리스터가 소손될 때 까지 인가하였으며 그 때의 전압을 각각 측정하였다. 그 결과 10/350?? 서지전류의 크기가 증가함에 따라 제한 전압의 크기는 증가하였고 바리스터가 소손되기까지의 서지인가횟수는 감소하였다.
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서지전류 변화에 따른 ZnO 배리스터의 제한 전압 특성에 관한 연구
여인식(In-Sik Yeo),김형배(Hyoung-Bae Kim),위진우(Jinwoo Wee) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.2
In this paper, we are doing research on the effects of the injected number and amplitude of surge current on ZnO varistor limiting voltage versus change of injected surge current(10/350μs). We injected surge current under the same conditions until the varistor totally broke down and then took a measurement of voltage at that time. We analyze characteristics of surge currents on the performance of ZnO varistor, the measurement of voltage before and after the injection of the same surge current. As a consequence, the amplitude of average limiting voltage through ZnO varistor were increased with increasing surge currents. And we found that the number of injection on the surge current was increased for lower surge current.
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온도측정에 의한 SPD용 배리스터의 성능평가에 관한 연구(Ⅰ)
여인식(In-Sik Yeo),고영민(Young-Min Ko),이기식(Ki-Sik Lee) 대한전기학회 2009 전기학회논문지 P Vol.58 No.4
In this paper, how the temperature of a varistor changes when 10/350㎲ surge currents and/or DC leakage currents are applied on it, respectively, are investigated. The temperature change in varistor is related with injection energy and leakage current. which is the integration of power in time. By the surge current test, we found that the temperature jump is proportional to the level of surge current with slant 52.535 and has no relation with the ambient temperature. And by the DC leakage current test, the difference in temperatures between varistor and ambient is proportional to the magnitude of leakage current. The slope of measured line(the temperature difference vs. the leakage current) shows alteration around 100㎂. The varistors can not be used more than 100㎂ region any more. From the above experimental results, we can conclude that data of the surge current test and also those of DC leakage current test can predict the performance of varistors of which the surge protective devices are made.
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계통에 유입된 서지 양과 횟수에 따른 Varistor 성능에 관한 연구
김동진(Dong-Jin Kim),여인식(In-sik Yeo),이기식(Ki-sik Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.9
현대 산업에서 정밀기기와 정보기기의 사용이 증가되면서 전력품질의 중요성이 강조되고 있다. 또한 건축물 뇌 보호 관련 규정이 KS C IEC 62305로 개정되면서 선택사항에 불과했던 내부 뇌 보호 시스템 서지보호기(SPD)의 설치가 의무화 되었다. 그런데 사용자들이 실제 이용하고 있는 서지보호기를 현장에 적용하였을 때 많은 문제점이 드러났다. 첫째, 서지보호기를 설치 후 제대로 작동 하는지 동작 상태를 파악할 수 없고 단지 낙뢰가 몇 번 유입되었는지의 카운터 기능의 시각적 판단만 가능하다. 또한 시간이 지나면서 서지보호기의 특성 변화 파악이 불가능하다. 설치 후 제 성능을 얼마나 발휘하는 가를 알 수 없고 LAMP에 의해 SPD의 소손 여부만을 판단할 수 있어 SPD의 교체시기를 알 수 없다. 이런 문제점을 해결하기 위해서는 서지보호기에 유입되는 서지크기, 유입경로 및 횟수를 통한 서지보호소자의 성능에 대한 대책 마련을 가능케 하여 바람직한 서지보호 및 적용이 가능토록 하고자 한다.
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여인식,한경수 원광대학교 치의학연구소 2002 圓光齒醫學 Vol.11 No.3
This study was performed to investigate the effect of adaptation of snoring appliance on the change of size of pharyngeal space and position of the mandible, hyoid bone and the tongue, and to determine the least amount of mandibular anterior positioning, which can be used for treating of concomitant temporomandibular disorders(TMD) and snoring. For the study, 40 dental students were selected. They had no signs and symptoms of TMD except slight joint sound and also had no signs and symptoms of snoring. Two types of intraoral appliance were fabricated : mandibular anterior positioning splint(APS), commonly used for patients with TMD, and mandibular advancement device(MAD), which is one of major types of snoring appliance. The mean distance of mandibular advancement by each appliance was 3mm and 5mm, respectively. Cephalometric radiographs were taken in the three mandibular position, namely, without appliance, with APS, and with MAD, and were traced for the selected twenty-one items, related to cervical posture, size of pharyngeal space, and position of the mandible, hyoid bone and the tongue. The data were processed with SPSS windows?? program for the change of each item by intraoral device, the correlation among items, and the difference of change between high and low group divided by some parameters. The result obtained were as follows : 1. Increase of pharyngeal space(PS-A2) corresponding to nasopharynx, anterior inferior movement of the mandible, and increase of distance from palate to posterior part of dorsum of tongue were observed by adaptation of intraoral devices, especially by MAD. 2. Correlation among CVT angle, ABaB angle, mandibular plane angle, and PS-A2 were statistically significant in all the three mandibular position. There were positive correlation among CVT angle, ABaB angle, mandibular plane angle, meanwhile, these items showed negative correlation with PS-A2. 3. When all the subjects were divided into high and low group according to mean value of some parameters such as CVT angle, ABaB angle, and mandibular plane angle in ordinary position, low group generally showed more significant change by intraoral devices than high group did.
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