Vibration characteristics of endodontic motors with different motion

Yeong-ju Jeon(전영주),Jin-Woo Kim(김진우),Kyung-Mo Cho(조경모),Se-Hee Park(박세희),Hoon-Sang Chang(장훈상) 대한치과의사협회 2014 대한치과의사협회지 Vol.52 No.12

Objectives: By introduced reciprocation motion file in dentistry, dentists benefit simple canal shaping procedure and time saving. But, reciprocation motion generates uncomfortable vibration to doctors and patients. Because there was no study about this consideration, this study compared vibration pattern and power generated from reciprocation motion motor and conventional rotary motor. Materials & Methods: One conventional rotary motor; X Smart (Dentsply Maillefer, Ballaigues, Switzerland); and two reciprocating motors; WaveOne Motor (Dentsply Maillefer, Ballaigues, Switzerland) and X SMART PLUS (Dentsply Maillefer, Ballaigues, Switzerland); were used in this study. Triaxial ICP Accelerometer (Model 356A12, PCB piezotronics, New York, USA) was attached on motor’s handpiece head, and was measured tri axial vibratory acceleration with NI Sound and Vibration Assistant 2009 software (National Instruments, Texas, USA). Mean vibratory acceleration and maximum vibratory acceleration was measured on fixed position and handed position. The results of vibratory acceleration were statistically analyzed using ANOVA and multiple comparisons are made using Turkey’s test at p<0.05 level. Results: Reciprocating motors showed higher mean vibratory acceleration and maximum vibratory acceleration than conventional rotary motor (p<0.05). Between reciprocating motors, X SMART PLUS had lower mean vibratory acceleration and maximum vibratory acceleration than WaveOne Motor (p<0.05). Conclusion: Reciprocating motors generate more vibration than conventional rotary motor. Further study about effect of vibration to dentist and patient is needed. And it seems to be necessary to make a standard about vibration level in endodontic motors.

영국해상보험법상 고지의무의 중요한 사항

김재형 ( Jae Hyeong Kim ),전영주 ( Yeong Ju Jeon ) 한국상사판례학회 2006 상사판례연구 Vol.19 No.4

Application of Chiral Bidentate Ligands to the RuHCl(CO)$(PPh_3)_3$ System: Unusual Isomerism Derived from the Chiral Ligands

박영준,허성,염경태,전영주,전무진,Park, Yeong Jun,Heo, Seong,Yeom, Gyeong Tae,Jeon, Yeong Ju,Jeon, Mu Jin Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.9

자살시도자들에서 충동성과 자살시도의 의학적 치명도와의 관계

박지원,서경훈,손경훈,한재현,전영주,정유진,이원준,성수정,한창환,조규종,황재연,Park, Ji Won,Suh, Kyung Hoon,Son, Kyung Hoon,Han, Jae Hyun,Jeon, Yeong Ju,Jung, Yu Jin,Lee, Won Joon,Seong, Su Jeong,Han, Chang Hwan,Cho, Gyu Chong,Hwang, J 대한생물정신의학회 2018 생물정신의학 Vol.25 No.4

Objectives Although impulsivity has long been thought as an important factor influencing suicidal behaviors, it is unknown whether impulsivity increases the risk of dying from suicidal behaviors and what specific component among constructs of impulsivity contributes to the risk of dying among suicide attempters. Methods To elucidate the association between impulsivity and medical lethality of suicide attempt among suicide attempters, we consecutively recruited 46 suicide attempters who visited an emergency room of a general hospital located in a metropolitan area, Seoul, Republic of Korea, due to suicide attempts and consented to participate in this study. Then we assessed medical lethality with the Beck Lethality Scale (LS) and impulsivity with the Korean version of the Barratt Impulsiveness Scale-11-Revised (BIS). Demographic variables were obtained from medical records and structured social work reports for suicide attempters. Results Although total scores of the BIS did not correlate with LS scores, only the scores of self-control, that is one of the Barrett's six theoretical constructs of impulsivity in which the higher score indicates less self-control and more impulsivity, had a significant positive correlation with scores of LS (p = 0.003). The association remained significant after adjusting for variables known to affect suicide lethality such as job status, recent alcohol consumption, diagnosis of depressive disorders, and having a plan for suicide (${\beta}=0.429$, p = 0.009). Conclusions Not impulsivity in general, but poor self-control, in particular, predicts lethal suicidal behaviors among suicide attempters. The degree of self-control should be evaluated when assessing patients with elevated suicide risk, and proper measures should be installed to prevent possible future lethal suicide attempts.

취약계층과 안전계층 노인에서 우울증상과 인지기능 저하가 자살의도에 미치는 영향

서경훈(Kyung Hoon Suh),최경화(Kyung-Hwa Choi),황재연(Jae Yeon Hwang),임경미(Kyung Mi Yim),전영주(Yeong Ju Jeon),김형준(Hyung Joon Kim),한창환(Chang Hwan Han),류성곤(Sung Gon Ryu) 대한사회정신의학회 2015 사회정신의학 Vol.20 No.2

연구목적 : 본 연구의 목적은 노인 인구 집단에서 취약성에 따라 우울 증상과 인지 장애가 자살 사고에 미치는 영향을 알아보고자 함이다. 방 법 : 총 347명의 65세 이상 지역사회 거주 노인들을 대상으로 모집하여 그들의 사회인구학적 정보, 가족관계, 건강 상태, CAGE 점수, 스트레스 정도, 단축형 노인우울척도 점수를 수집하였다. 인지 장애와 자살 사고는 각각 한국판 간이 정신상태 판별검사, 자살생각 척도를 이용하여 평가되었다. 결 과 : 취약 계층에서 자살사고의 유병률은 18.5%, 안전 계층에서는 8.2%였다. 취약계층에서의 우울 증상은 자살사고와 관련이 있었다(Odds ratio : 6.1, 95% confidence interval : 1.93 to 19.33). 결 론 : 본 연구에서, 낮은 사회경제적 상태에 있는 취약 계층의 노인이 안전 계층의 노인에 비해 자살 사고의 위험이 높았다. 이 결과는 미래의 정신 보건 정책이 낮은 사회경제적 상태에 있는 지역사회 거주 노인들의 중요성을 고려하여야 한다는 점을 시사한다. Objectives : The purpose of this study was to examine the influence of depressive symptoms and cognitive impairment on suicidal ideation in an elderly population, according to vulnerability. Methods : A total of the 347 community-dwelling elderly individuals aged 65 years or older were recruited and information on their sociodemographics, family relationships, health status, CAGE (Cut down, Annoyed, Guilty, Eye-opener) scores, stress levels, and scores on the Korean version of the Short Geriatric Depression Scale was collected using questionnaires. Cognitive impairment and suicidal ideation were evaluated by using the Mini Mental Status Exam-Korean version (MMSE-K) and the Scale for Suicide Ideation (SSI), respectively. Results : The prevalence of suicidal ideation in the vulnerable group was 18.5% and in the secure group was 8.2%. The presence of depressive symptoms in the vulnerable group was associated with suicidal ideation (Odds ratio : 6.1, 95% confidence interval : 1.93 to 19.33). Conclusion : In this study, the risk of suicidal ideation in the vulnerable group consisting of low-socioeconomic status elderly individuals was higher than that in the safety group. These results suggest that future mental healthcare policies should consider the importance of community-dwelling elderly individuals with low-socioeconomic status.

중동호흡기증후군(MERS) 환자와 접촉한 후 격리된 병원 근로자에게서 나타난 격리 방법에 따른 정신증상의 차이

김형준(Hyung Joon Kim),임경미(Kyung Mi Yim),황재연(Jae Yeon Hwang),성수정(Su Jeong Seong),박지원(Ji Won Park),손경훈(Kyung Hoon Son),전영주(Yeong Ju Jeon),한창환(Chang Hwan Han) 대한사회정신의학회 2016 사회정신의학 Vol.21 No.2

연구목적 : 유행성 감염질환 발생 시 환자와 밀접하게 접촉하는 병원 직원들은 우울, 불안, 급성 스트레스 장애 등 정신건강문제를 겪을 수있는데, 특히 격리된 직원의 경우 정신건강에 악영향을 받을 수 있다고 보고되어 있다. 이 연구에서는 병원 직원의 격리방법에 따라 정신건강문제 발생에 차이가 있는지를 확인하고, 정신증상의 관련 요인을 파악하는 것을 목적으로 한다. 방 법 : 2015년 중동호흡기증후군(MERS) 유행 시, 감염환자와 접촉한 병원 직원들은 집이나 병원 내 격리 병실에서 격리되었다. 서울의일 종합병원에서 격리되었던 병원 직원 전수 146명을 대상으로 설문조사를 시행하였다. 조사는 MERS 환자에게 노출된 지 약 1달후, 격리가 해제된 지 약 2주가 지난 시접에 진행되었으며, 인구학적 정보 및 격리 관련 정보를 파악하는 문항과, 우울, 불안, 급성 스트레스를 평가하기 위한 다음 설문이 포함되었다: 1) 환자 건강 질문지-9(Patient Health Questionnaire-9, PHQ-9), 2) 상태-특성 불안 검사(State-Trait Anxiety Inventory, STAI), 3) 스탠포드 급성 스트레스 반응 질문지(Stanford Acute Stress Reaction Questionnaire, SASRQ). 결 과 : 거주지에 자가 격리되었던 군에 비해, 병원 내 격리 군에서 유의한 우울증상(PHQ-9≥10점)을 더 많이 보였고(19.7% vs 70.0%, p< 0.001), 급성 스트레스 장애도 더 많은 것으로 나타났다(7.3% vs 25.0%, p=0.014). 우울 증상의 관련요인을 파악하기 위해 인구학적 요인 등을 보정한 회귀분석 결과, 병원 내에 격리될 경우(OR=6.342, 95% CI=1.853-21.708, p=0.003), 그리고 격리 기간이 길수록(OR=1.153, 95% CI=1.036-1.285, p=0.009). 유의하게 우울증상의 위험이 높았다. 결 론 : 병원 내 격리 방식과 긴 격리기간은 우울증상의 위험을 유의하게 높이는 것으로 나타났다. 병원 내 격리 시, 격리 후 정신건강문 제의 발생을 최소화하고 적절한 중재 가능성을 높일 수 있도록 면밀한 관찰과 적절한 격리방식의 검토가 이루어져야 할 것이다. Objectives : During the 2015 Middle East Respiratory Syndrome (MERS) outbreak in Republic of Korea, health care workers (HCWs) that had contact with infected patients were quarantined, either at home or within a hospital quarantine ward. The current study aimed to compare psychiatric morbidities of HCWs quarantined in different locations. Methods : Questionnaires were administered to all 146 quarantined HCWs in a general hospital in Seoul, Republic of Korea, about a month after exposure to a MERS patient and about 2 weeks after release from quarantine. Collected data included demographics and responses to the following instruments to assess depressive symptoms, anxiety, and acute stress, respectively : 1) Patient Health questionnaire-9 (PHQ-9), 2) Spielberger’s State Trait Anxiety Inventory (STAI), and 3) Stanford Acute Stress Reaction Questionnaire (SASRQ). Results : Hospital quarantined HCWs were more depressive (p<0.001), more likely to be diagnosed with acute stress disorder (p=0.014). There was significant association between depression and being hospital quarantined [Odd ratio (OR)=6.342, 95% CI=1.853-21.708, p=0.003], and between depression and longer quarantine duration (OR=1.153, 95% CI=1.036-1.285, p=0.009). Conclusion : Hospital quarantined HCWs were likely more depressed and having acute stress disorder. Being hospital quarantined and longer duration of quarantine were associated with depression. Within-hospital quarantine should be carefully installed and closely monitored to minimize psychological distress and maximize chance of timely intervention.

혈장 염증 시토카인과 치매, 경도인지장애 진단의 연관성

손경훈(Kyung Hoon Son),성수정(Su-Jeong Seong),이원준(Won Joon Lee),황재연(Jae Yeon Hwang),한채현(Jae Hyun Han),전영주(Yeong Ju Jeon),한창환(Chang Hwan Han) 대한생물치료정신의학회 2019 생물치료정신의학 Vol.25 No.1

Objectives:The aim of this study was to investigate the association of plasma levels of inflammatory cytokines with dementia and mild cognitive impairment. Methods:We compared serum levels of tumor necrosis factor-alpha(TNF-alpha), interleukin-6(IL-6), and insulinlike growth factor-1(IGF-I) in patients with dementia(n=8), mild cognitive impairment(MCI, n=15) and normal elderly (n=14). The diagnosis of dementia was made by the Diagnostic Statistical Manual of Mental Disorders-4th edition (DSM-IV). MCI was diagnosed based on the criteria of the National Institute of Aging and Alzheimer Association(NIAAA) working group. Results:When compared with normal controls, the levels of TNF-alpha and IL-6 were increased and level of IGF-I was decreased in MCI and dementia. Higher levels of TNF-alpha and IL-6 and lower level of IGF-I were also associated with increased age. However, when adjusted for age, the association between diagnosis and TNF-alpha, Il-6 and IGF-I was not significant. Conclusion:The difference in plasma levels of inflammatory cytokines in dementia and MCI may be associated with aging.