자외서 살균장치용 AlGaN기반의 자외선 센서

손정환,권기영 公州大學校 工學硏究院 生産技術硏究所 2005 論文集 Vol.13 No.-

We studied AlGaN-based UV sensors for UV germicidal application. The crack-free AlGaN epitaxial layer was achieved by inserting thin AlN buffer layer between AlGaN layer and GaN layer. Good epitaxial quality was proved by PL spectrum which has the peak wavelength of 275nm and the FWHM of 8.7nm. The dark current of the fabricated device with Ni-Schottky contact was lower than 1pA for Vr=3V bias and the turn-on voltage was 2V at If=1uA. we also obtained that the responsivity was 0.067A/W at 260nm and the cut-off wavelength was 280nm. Under the UV exposure test, the fabricated sensor was not degraded for 200hrs at the UV-C power of 10mW/㎠

Study of Rehabilitation of Injured Knee Joint Applying Chaotic Theory in Human Body Motion

Moon, Byung Young,Son, Kwon,Park, Jung Hong Trans Tech Publications, Ltd. 2007 Key Engineering Materials Vol.342 No.-

<P>Gait analysis is essential to identify accurate cause and knee condition from patients who display abnormal walking. Traditional linear tools can, however, mask the true structure of motor variability, since biomechanical data from a few strides during the gait have limitation to understanding the system. Therefore, it is necessary to propose a more precise dynamic method. The chaos analysis, a nonlinear technique, focuses on understanding how variations in the gait pattern change over time. Healthy eight subjects walked on a treadmill for 100 seconds at 60 Hz. Three dimensional walking kinematic data were obtained using two cameras and KWON3D motion analyzer. The largest Lyapunov exponent from the measured knee angular displacement time series was calculated to quantify local stability. This study quantified the variability present in time series generated from gait parameter via chaos analysis. Gait pattern is found to be chaotic. The proposed Lyapunov exponent can be used in rehabilitation and diagnosis of recoverable patients.</P>

제지슬러지의 토지주입에 관한 연구

성낙창,김정권,손희정,김은호,김형석 東亞大學校生命資源科學大學附設 農業資原硏究所 1996 農業生命資援硏究 Vol.5 No.1

To examine the agricultural availability of paper sludge, this study investigated the degradation rate of sludge, CO₂ generation out of soil treated with sludge and the degration characteristics of sludge in soil 1. Degradation rate of paper in soil at weeks after treatment was 19.0% at natural temperature and 28.0% at incubation temperature(30℃) 2. The changes of T-C, T-N and C/N ratio of paper sludge in soil at 12 weeks after treatment were 15.5%, 0.22% and 71, respectively, at natural temperature, and 14.5%, 0.24% and 60, respectively at incubation temperature. 3. The changes of pH in soil treated with paper were 6.7∼7.4 at natural temperature and 6.1∼8.0 at incubation temperature. 4. CO₂ generations in soil treated with 1.0%, 3.0% and 5.0% of paper sludge at 12weeks after treatment were 247mg/100g, 334mg/100g and 458mg/100g, respectively, at natural temperature and 385mg/100g, 550mg/100g and 618mg/100g, respectively, at incubation temperature(30℃)

쌍태아에서 제 1태아의 분만 후 제 2태아의 지연분만 : 중례보고

김주환,서민정,유희정,노권일,조대현,박정규,이정헌,조성남,손영수 朝鮮大學校 附設 醫學硏究所 2005 The Medical Journal of Chosun University Vol.30 No.3

With the widespread use of fertility medications and techniques of in vitro fertilization, multiple gestation has become epidemic in modern obstetric practice. Delivery of the initial fetus in a multiple gestation usually is followed by delivery of the subsequent fetus or fetuses shortly thereafter. However in rare circumstances, the delivery is delayed for days due to disappearance of uterine contraction after delivery of the first fetus. When uterine activity ceases after the delivery of the first neonate, a policy of nonintervention may be considered in case of an immature or very premature delivery, in order to achieve a gestational age for the remaining fetus(es) more compatible with neonatal survival. We report a case of twin gestation with prolongation of the delivery interval between the twins for 46 days.

양전자방출단층촬영을 이용한 초점주의와 작동기억의 뇌 활성화 양상 비교

김재진,조상수,김명선,손정우,이재성,이동수,이명철,권준수 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.2

연구목적: 단순 초점주의 과제와 보다 고도의 집중을 요하는 작동기억 과제를 수행하는 동안의 뇌 활성화 양상을 비교하여, 두 인지기능 과정을 매개하는 정상적 신경회로의 특성과 차이를 알아보는 것을 목적으로 하였다. 방법: 정상인 14명을 대상으로 시각처리 대조 과제, 단순 초점주의 과제, 작동기억 과제 등 세 가지 인지과제를 주고, 과제 수행 동안 [□O]H₂O를 추적자로 한 양전자방출단층활영을 실시한 후 감산분석을 통해 초점주의와 작동기억의 신경회로 지도를 작성하여 비교분석하였다. 결과: 초점주의 동안 활성화되는 부위는 좌측으로 편측화되고 산발적으로 분포하는 양상이었고, 특히 전대상이랑과 운동영역을 포함한 전두엽, 일차 및 이차 시각피질 등의 활성화가 특징적이었다. 작동기억 동안의 뇌 활성화 역시 산발적 분포와 좌측 편측화 양상이 관찰되었으나, 시각피질보다는 전두엽의 활성화가 우세하였고, 특히 우측 전대상이랑의 현저한 활성화가 특징적이었다. 결론: 초점주의와 작동기억은 개념적으로 공통점과 차이점을 내포하고 있는 것처럼 매개 신경회로에서도 공통 혹은 특이한 영역을 각각 가지며, 전대상이랑의 역할이 두 기능에 공통적으로 중요하고, 이차 시각피질과 전전두피질이 두 기능 각각에 더 중요하게 작용하는 것 같다. Objectives:This study was undertaken to identify neural substrates for simple focused attention and more highly-focused working memory i normal people and investigate their characteristics and differences. Method: Fourteen normal subjects were studied with [□O]H₂O positron emission tomography during a visual processing baseline task, simple focused attention task and working memory task. Results were analyzed with the subtraction analysis to map the neural correlates of focused attention and working memory. Results: Activated areas during focused attention tended to be lateralized to the left and scattered over various regions including the anterior cingulate, motor area, and primary and secondary visual cortices. While the areas activated during working memory also show the left lateralization and scattered distribution, activation prevailed more in the frontal lobe than in the visual cortex, and was particularly remarkable in the right anterior cingulate. Conclusions: Focused attention and working memory do not have only conceptually commonalities and differences but also have common and specific areas in their neural substrates. The anterior cingulate may commonly play an important role in both cognitive functions, whereas secondary visual cortex and prefrontal cortex seem to be predominantly implicated in each function, respectively.

카오스 해석법을 이용한 전방십자인대 재건수술 환자와 정상인의 보행연구

고재훈(Jae Hun Ko),손권(Kwon Son),박정흥(Jung Hong Park),서정탁(Jeung Tak Suh) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.2

Anterior cruciate ligament(ACL) injury of the knee is common and a serious ACL injury leads to ligament reconstruction surgery. Gait analysis is used to identify the result of surgery. The purpose of this study is to numerically evaluate and classify knee condition of patients through the chaos analysis. Experiments were carried out for 13 subjects(8 healthy subjects, 5 ACL deficient patients) walking on a treadmill. Sagittal kinematic data of the right lower extremity were collected by using a 3D motion analysis system. The recorded gait patterns were digitized and then coordinated by KWON3D. The largest Lyapunov exponent from the measured knee angular displacement time series was calculated to quantify local stability. It was found that the Lyapunov exponent becomes larger as the knee condition becomes worse. This study suggested a method of the severity of injury and the level of recovery. The proposed method discerns difference between healthy subjects and patients.

입원한 정신분열병 환자의 가족에 대한 가족교육 단기 프로그램의 효과

이부영,신민섭,하규섭,권준수,손정우 大韓神經精神醫學會 1996 신경정신의학 Vol.35 No.6

정신분열병 환자의 가족은 많은 심리적 스트레스와 부담감을 지니고 생활하게 된다. 또한 환자와 그 가족 사이에 마찰이 생겨 결국 환자의 예후에 좋지 않은 영향을 끼치기도 한다. 이런 것들을 해결하기 위한 여러 정신과적 중재방법들 중 정신교육적 가족치료의 일환으로서 가족 교육 단기 프로그램의 유용성이 점점 부각되고 있다. 이에 우선 가족 교육 연구진을 구성하고 교육자료를 준비한 뒤, 1995년 9월 2일부터 입원한 정신분열병 환자의 가족을 대상으로 가족교육을 시행하였으며 교육적·후에 설문지 평가를 하였다. 이때 평가한 것은 일상생활에서의 가족의 전반적인 불안, 환자와 연관된 걱정, 환자에 대한 가족의 거부감, 정신분열병에 대한 전반적 지식 등이다(N=20). 또 대조군은 1996년 1월부터 5월까지 서울대학병원 신경정신과 폐쇄병동에 입원한 정신분열병 환자 가족을 대상으로 하였으며, 같은 종류의 설문지로 사전·사후평가를 하였다(N=10). 결과는 다음과 같다. 1) 교육군과 대조군의 사전평가 점수를 각 설문지별로 비교하였는데, 불안 설문지, 지식 설문지의 점수에서는 두 군간의 차이가 발견되지 않았으나, 거부감 설문지의 점수는 교육군에서 대조군보다 통계적으로 유의하게 높았다(F=9.50, df=1.28, p<0.01). 2) 교육군과 대조군 각 군 내에서 사전·사후평가 점수를 비교하였을 때, 교육군에서는 지식 설문지에서 사후평가 점수가 사전평가 점수보다 유의하게 높았으며(t=5.43, df=19, p<0.01), 걱정 설문지와 거부감 설문지에서는 사후평가 점수가 사전평가 점수보다 유의하게 낮았다(걱정 설문지의 t=-3.03, df=19, p<0.01 ; 거부감 설문지의 t=-2.34 df=19, p<0.05). 그러나 교육군에서 불안 설문지의 점수에서는 별다른 차이가 나타나지 않았다. 한편 대조군에서도 지식 설문지에서 사후평가 점수가 사전평가 점수보다 유의하게 높았지만 (t=1.86, df=19, p<0.05), 교육군에 비해서 그 차이는 경미하였다. 3) 각 설문지의 사전·사후평가 점수의 차이의 상관관계를 측정한 결과 교육군에서는 우선 불안 점수의 차(r=-0.56, p<0.01)와 걱정 점수의 차(r=-0.57, p<0.01)가 지식 점수의 차와 유의한 부적 상관관계를 보였으며, 불안 점수의 차와 걱정 점수의 차 사이에는 유의한 정적 상관관계(r=0.55, p<0.01)가 보였다. 대조군에서는 걱정 점수의 차와 지식 점수의 차 사이에 유의한 부적 상관관계가 존재하였다(r=-0.60, p<0.05). 4) 각 설문지의 사전·사후평가 점수의 차와 사회인구학적 특성 사이의 상관관계를 조사한 결과 교육군에서는 불안 점수의 차와 환자의 유병기간(r=0.39, p<0.05), 불안 점수의 차와 참가 가족의 교육 수준(rs=0.43, p<0.05), 걱정 점수의 차와 환자의 유병기간(r=0.45, p<0.05), 걱정 점수의 차와 참가 가족의 교육 수준(rs=0.49, p<0.05) 사이에 통계적으로 유의한 정적 상관관계가 존재하였으며, 대조군에서는 걱정 점수의 차와 참가 가족의 나이 사이에 정적 상관관계(r=0.64, p<0.05)를, 그리고 걱정 점수의 차와 참가 가족의 교육 수준 사이에 부적 상관관계가 존재하였다(rs=-0.74, p<0.01). Objects : The purpose of this study was to investigate the effectiveness of the brief program of family education in helping families of inpatients with schizophrenia. Methods : The education group consisted of twenty people who were families of inpatients with schizophrenia and who attended the brief program of family education. Ten people who were families of inpatients with schizophrenia and who didn't attend the brief program of family education comprised the comparison group. Four self=report questionnaires assessing global anxiety(Anxiety Questionnaire), worry related to patient(Worry Questionnaire), rejection feeling to patient(Rejection Questionnaire), and knowledge about schizophrenia(Knowledge Questionnaire) were administered to the education group and to the comparison group, twice at the pre-test and post-test. Results : 1) In the education group, scores of Knowledge Questionnaire(t=5.43, df=19, p<0.01) at the post-test were significantly higher than those at the pre-test. Scores of Worry Questionnaire(t=-3.03, df=19, p<0.01) and Rejection Questionnaire t=-2.34 df=19, p<0.05) at the post-test were significantly lower than those at the pre-test. In comparison group, scores of Knowledge Questionnaire were significantly higher at the post-test compared to those at the pre-test(t=1.86, df=19, p<0.05). However, the change in comparison group was not as divergent as in the education group. 2) Differences between the pre-test scores and the post-test scores in each questionnaire were sought. In the education group, significant negative correlation existed between calculated differences of Knowledge Questionnaire and Anxiety Questionnaire(r=-0.56, p<0.01), between Knowledge Questionnaire and Worry Questionnaire(r=-0.57, p<0.01), and significant positive correlation existed between Anxiety Questionnaire and Worry Questionnaire(r=0.55, p<0.01). In the comparison group, significant negative correlation existed between Knowledge Questionnaire and Worry Questionnaire(r=-0.60, p<0.05). 3) The author also assessed the relationship between calculated differences of the pre-test scores from the post-test scores in each questionnaire and demographic characteristics. In the education group, significant positive correlation existed between calculated difference of Anxiety Questionnaire nd duration of illness(r=0.39, p<0.05), between Anxiety Questionnaire and educational level of family(rs=0.43, p<0.05), between Worry Questionnaire and duration of illness(r=0.49, p<0.05) and between Worry Questionnaire and educational level of family(rs=0.45, p<0.05). In control group, significant positive correlation existed between Worry Questionnaire and age of family(r=0.64, p<0.05) and significant negative correlation existed between Worry Questionnaire and educational level of family(rs=-0.74, p<0.01). Conclusion : The brief program of family education was effective in increasing knowledge about schizophrenia, decreasing of worry related to the patients and rejection feeling about the patients in families of inpatienis with schizophrenia.

Verification of Pilot Scale Soil Washing Equipment on Nuclear Power Plant Soil

Jung-kwon Son,Ki-doo Kang,Hak-soo Kim,Kyoung-rock Park,Kyoung-doek Kim 한국방사성폐기물학회 2004 방사성폐기물학회지 Vol.2 No.4

원전의 정상운전이나 해체시 발생될 수 있는 토양의 제염을 위한 토양제염장치를 개발하였으며 실증 실험을 수행하였다. 제염장치를 이용한 제염실험을 종합해본 결과 제염조건에 큰 상관없이 이상의 제염율을 얻을 수 있었다. 방사능 준위 및 토양입도에 의한 실험결과를 보면 낮은 방사능 농도 및 고입도의 제염율이 다소 높음을 알 수 있었다. 제염용액과 토양질량의 비에 따른 제염율은 제염제 부피를 두배로 높였을 경우 방사능 농도가 높은 경우에 큰 것으로 나타났다. 반복 제염은 의 다소 작은 입자에 더욱 효과적으로, 제염이 어려운 작은 입자의 반복제염시 방사능 저감 효과가 비교적 크게 나타났다. 본 오염토양 제염장치를 활용하면 원전에서 발생되는 오염토양의 방사능 농도를 줄일 뿐 아니라 처분양을 줄여 저장공간의 확보에 기여할 뿐만 아니라 향후 원전의 해체시에도 유용하게 활용될 수 있으리라 생각된다. Soil washing equipment was developed for decontamination of radioactively contaminated soil generated during normal operation or decommissioning and verification experiments were performed. Decontamination effciency above was achieved. In case of low radiation level and large particle size, decontamination efficiency was higher. According to the ratio of volume of water to soil quantity, decontamination efficiency was higher in case of high radiation level. Re-decontamination using decontaminated soil was effective in case of small particles. Using soil washing equipment, radioactivity of contaminated soil generated in nuclear power plant can be decreased and volume of soil for disposal can be decreased. And this equipment can be used in decommissioning.

A <i>SMN2</i> Splicing Modifier Rescues the Disease Phenotypes in an In Vitro Human Spinal Muscular Atrophy Model

Son, Ye Seul,Choi, Kwangman,Lee, Hana,Kwon, Ohman,Jung, Kwang Bo,Cho, Sunwha,Baek, Jiyeon,Son, Bora,Kang, Sung-Min,Kang, Mingu,Yoon, Jihee,Shen, Haihong,Lee, Sangku,Oh, Jung-Hwa,Lee, Hyang-Ae,Lee, Mi- Mary A 2019 STEM CELLS AND DEVELOPMENT Vol.28 No.7

Thermal irritation of teeth during dental treatment procedures

Kwon, Su-Jung,Park, Yoon-Jung,Jun, Sang-Ho,Ahn, Jin-Soo,Lee, In-Bog,Cho, Byeong-Hoon,Son, Ho-Hyun,Seo, Deog-Gyu The Korean Academy of Conservative Dentistry 2013 Restorative Dentistry & Endodontics Vol.38 No.3

While it is reasonably well known that certain dental procedures increase the temperature of the tooth's surface, of greater interest is their potential damaging effect on the pulp and tooth-supporting tissues. Previous studies have investigated the responses of the pulp, periodontal ligament, and alveolar bone to thermal irritation and the temperature at which thermal damage is initiated. There are also many in vitro studies that have measured the temperature increase of the pulp and tooth-supporting tissues during restorative and endodontic procedures. This review article provides an overview of studies measuring temperature increases in tooth structures during several restorative and endodontic procedures, and proposes clinical guidelines for reducing potential thermal hazards to the pulp and supporting tissues.