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조현병 환자에서 아미설프라이드에 의한 체중증가와 도파민 D2 수용체 유전자다형성의(rs1800497) 연관성
서민재(Min Jae Seo),우정민(Jung Min Woo),이종훈(Jong Hun Lee),최태영(Tae Young Choi),김지현(Ji Hyun Kim),최성민(Sung Min Choi) 대한생물치료정신의학회 2014 생물치료정신의학 Vol.20 No.3
Objectives:The aim of this study is to evaluate the association between antipsychotics-induced weight gain and the polymorphisms in the dopamine receptor D2(DRD2) genes. Methods:We measured the weight and height of 125 schizophrenia patients before and after treatment. The genotyping for rs1800497 was performed using TaqMan single nucleotide polymorphism(SNP) genotyping assay. Results:There was a significant difference in the amisulpride-induced change of body mass index(BMI) according to the frequency of rs1800497 genotype. Conclusion:This is the first positive association study between DRD2 gene and the amisulpride induced weight gain in Korean schizophrenia patients. A larger scale research on more SNP of the DRD2 gene will make a progress in the study of amisulpride induced weight gain.
서민재(Min Jae Seo),김기홍(Ki Hong Kim) 대한생물치료정신의학회 2015 생물치료정신의학 Vol.21 No.2
It is not easy to differentiate stereotypic movements from tics and obsessive-compulsive behaviors in clinical settings, because those are common not only in children with developmental delay, but in those with normal developing pattern. Since the definition of stereotypy is unclear, this term tends to be applied to involuntary, patterned, repetitive, and/or rhythmic movements. In this review, stereotypic movements were categorized into primary and secondary groups depending on the presence of underlying causes. Identification and evaluation of possible etiology should always be performed before starting treatment. For primary stereotypy, pharmacological therapy and/or training programs could be tried, but their efficacy is not well-established yet. On the other hand, removal of the underlying causes is the most essential and necessary for secondary stereotypy.
한국 청소년 정신병리와 스마트폰 중독 및 인터넷 중독의 상관성
서민재(Min Jae Seo),최태영(Tae Young Choi),우정민(Jungmin Woo),김지현(Jihyun Kim),이종훈(Jonghun Lee) 대한생물치료정신의학회 2013 생물치료정신의학 Vol.19 No.2
Objectives:Despite the benefits of smartphone, the adverse effects have emerged. While it is well known that the internet addiction could affect mental health in adolescents, the information about the effect of smartphone addiction is relatively limited. We evaluated the relationships among smartphone addiction, internet addiction and psychopathologies of adolescents. Methods:One hundred ninety four adolescents participated in this study. The severity of addiction was measured through the 2010 Smart-phone Addiction Rating Scales(SARS) and Young Internet Addiction Scale(YIAS). The psychopathologies of the subjects were evaluated with the Korea-Youth Self Report(K-YSR). We evaluated the correlations among SARS, YIAS and K-YSR using Pearson’s correlation and the differences of the K-YSR score depending on each degree of smartphone and internet addiction by one-way ANOVA. Results:The total score of the SARS(r=0.469, p<0.001) and YIAS(r=0.440, p<0.001) had positive correlations with the total problematic behavior score of K-YSR, respectively. We divided the subjects into four groups which were the L-L group(low smartphone addiction-low internet addiction), L-H group(low smartphone addiction-high internet addiction), H-L group(high smartphone addiction-low internet addiction), H-H(high smartphone addictionhigh internet addiction) group depending on the mean value of addiction. ANOVA revealed a significant difference among these groups on the nine of eleven subscales of the K-YSR. Conclusion:Our result showed that the more addicted, the more severe psychopathologies, regardless of addictive patterns. The number of adolescents who addicted to smartphone use must be increased as the popularization of smartphone is inevitable social trend. We should try to screen the smart-phone addiction as well as internet addiction in adolescents.
손목관절 CT 검사 시 자세 변화와 채널 변경에 따른 MTF평가 : Isocenter를 중심으로 X-축, Z-축 변화
서민재(Min Jae Seo),임종천(Jong Chon Lim),정다빈(Dabin Jung),한동균(Dong Kyoon Han) 한국방사선학회 2020 한국방사선학회 논문지 Vol.14 No.6
본 연구의 목적은 손목관절 CT 검사에서 환자 자세를 X-축, Y-축으로 변화시키고 CT 검사장치의 channel 변화에 따른 MTF 평가를 하는 것이다. CT 장치와 손목 팬텀을 이용하여 isocenter를 중심으로 X-축으로 0(일치), 5, 10, 15 cm 이동시켜 검사하고, Z-축은 반시계 방향으로 -20°, -40° 회전하여 검사하였다. 검사는 16, -40, 64 channel을 이용하여 channel 별 차이가 있는지도 확인하고자 하였다. 검사한 영상은 자뼈와 좌우측 노뼈의 MTF 값을 측정하여 비교하였다. isocenter를 중심으로 X-축으로 이동시킨 실험에서 이동 거리가 커질수록 MTF 값은 감소하였고, 이때 MTF 값은 channel과는 무관한 것으로 확인되었다. Z-축에서 반시계 방향으로 -20°, -40° 손목관절을 회전시킨 실험에서 회전정도와 MTF는 무관한 것으로 확인되었다. 또한 channel과도 무관하였다. 결론적으로 손목관절 CT 검사에서 손목은 X-축 방향으로 이동을 최대한 억제시키고, Z-축으로의 회전은 검사 대상자의 환경에 따라 변화하여도 영상의 MTF에는 큰 영향을 주지 않을 것이라 사료된다. This study aims to evaluate the Modulation Transfer Function (MTF) according to the change in the number of channels of the CT examination device by changing the posture of the patient to the X-axis and Y-axis in the wrist joint CT examination. Using a CT device and a wrist phantom, the test was performed by moving 0 (matched), 5, 10, and 15 cm in the X-axis around the isocenter, and the Z-axis was rotated by -20° and -40° . For the test, 16, -40 and 64 channels were used to check whether there was a difference for each number of channels. The examined images were compared by measuring the MTF values of the ulna and left and right sides of the radius. In the experiment where the isocenter was moved along the X-axis, the MTF value decreased with an increase in the moving distance, and the MTF value was found to be unaffected by the number of channels. In the experiment in which the wrist joint was rotated by -20° and -40° on the Z-axis, the degree of deviation and MTF were found to be irrelevant. It was not related to the number of channels either. In conclusion, the movement of the wrist along the X-axis should be restrained as much as possible for a wrist joint CT scan, whereas deviation around the Z-axis depending on the environment for the patient would not affect the MTF of the image.
서민재(Min-Je Seo),윤창민(Chang-Min Yoon),허재훈(Jae-Hoon Heo),김대제(Dae-Je Kim),이태훈(Tae-Hoon Lee),안진우(Jin-Woo Ahn) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.4
조이스틱 좌표 값을 전동휠제어 속도 값으로 변환하기 전 우선적으로 처리해야할 문제는 현재 조이스틱 좌표 값이 적절한 값인지를 판단하여 데이터를 처리하는 과정이 필요하다. 전동휠체어의 조작자가 장애인 및 노약자가 많은 점을 감안한다면 조작자의 실수 및 조작 미숙으로 인한 오작동이 빈번이 일어날 확률이 높다. 매번 이러한 실수를 제한 없이 사용하게 된다면 사용자는 큰 위험에 닥칠수가 있다. 기존의 조이스틱의 경우 일반적으로 조이스틱 입력 값을 수차례 합산을 하여 평균을 취하는 방식으로 동작을 해왔다. 이와 같은 방식은 조이스틱 좌표 값이 어떠한 변화를 가지더라도 그 출력 값의 변화가 적어 안정적이다는 장점이 있지만 사용자의 지령을 실시간으로 반영하지 못하는 단점이 있다. 기존 방식의 단점을 보완하기 위해 조이스틱 입력 값을 미분 입력 값의 변화량을 이용하여 데이터 작용 비율 및 평균 횟수를 조절하여 안정성과 함께 높은 응답성을 가지도록 구현하였다.