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YoungJong Kim,JinKyung Park,WonSub Kang,SuKang Kim,Changsu Han,HaeRi Na,HaeJeong Park,JongWoo Kim,YoungYoul Kim,MoonHo Park,JongWoo Paik 대한신경정신의학회 2017 PSYCHIATRY INVESTIGATION Vol.14 No.1
Objective-Mitochondrial dysfunction is a prominent and early feature of Alzheimer’s disease (AD). The morphologic changes observed in the AD brain could be caused by a failure of mitochondrial fusion mechanisms. The aim of this study was to investigate whether genetic polymorphisms of two genes involved in mitochondrial fusion mechanisms, optic atrophy 1 (OPA1) and mitofusin 2 (MFN2), were associated with AD in the Korean population by analyzing genotypes and allele frequencies. Methods-One coding single nucleotide polymorphism (SNP) in the MFN2, rs1042837, and two coding SNPs in the OPA1, rs7624750 and rs9851685, were compared between 165 patients with AD (83 men and 82 women, mean age 72.3±4.41) and 186 healthy control subjects (82 men and 104 women, mean age 76.5±5.98). Results-Among these three SNPs, rs1042837 showed statistically significant differences in allele frequency, and genotype frequency in the co-dominant 1 model and in the dominant model. Conclusion-These results suggest that the rs1042837 polymorphism in MFN2 may be involved in the pathogenesis of AD.
운행차 부하검사를 통한 매연도 및 NOx 상관성 분석 연구
김종우(Jongwoo Kim),김승열(Sungyul Kim),김계현(Gaehyun Kim) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
The current in-use vehicle emission legislation of diesel vehicle in Korea regulate smoke emission only. In this reason, questionable expedients ways are used to reduce the smoke emission to meet the emission standard at the periodic technical inspection emission test site. Cause of trade-off relationship between smoke and NOx, if smoke is reduced by intentional modified the emission system of the test vehicle, Nox emission increase remarkably at the test diesel vehicle. This paper describes the correlations of smoke and NOx characteristics of diesel vehicle that was removed EGR valve and air cleaner intentional purpose during Kd-147 mode, in-use emission testing mode of light-duty diesel vehicle in Korea, Results from these tests show that Nox emission increase 430% higher in the case of removing egr valve whereas smoke is reduced 76% at the test vehicle.
Effect of Glass Frit in TiO<sub>2</sub> Electrode for DSSCs
김종우(Kim, Jongwoo),전재승(Jeon, Jaeseung),김동선(Kim, Dongsun),황성진(Hwang, Seongjin),김형순(Kim, Hyungsun) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Dye sensitized solar cells(DSSCs) have been extensively studied due to their various advantages such as low production cost, colorful design, and eco-friendly process. Long optical path length is one of the most effective method to improve light harvest efficiency for DSSCs. Multi-layered TiO₂ nano-structured film with scattering layer has been studied to generate scattering effect by many researchers. It was expected that the difference of refractive index between TiO₂ particles and glass frit would generate the light scattering effect and provide the long optical path length. Therefore, to enhance the scattering effect, the frits of Bi₂O₃-B₂O₃-ZnO glass system that has the different refractive index were added to TiO₂ pastes in this study. First of all, the absorbance and haze factor of TiO₂ electrode with dyes and the refractive index of glass frit and TiO₂ were measured, respectively. To study the effect of frits, the efficiencies of DSSCs added glass frit and without glass frit were compared. Our results showed slightly higher efficiency with the different absorbance and haze factor of TiO₂ and glass frit. It was considered that the light scattering effect would be improved with adding frits to TiO₂ paste. Our preliminary studies will be useful for increasing efficiency of DSSCs.
관리도 성능평가모형을 통한 관리한계선 갱신주기 탐지기법
김종우(Jongwoo Kim),박정술(Cheong-Sool Park),김준석(Jun Seok Kim),김성식(Sung-Shick Kim),백준걸(Jun-Geol Baek) 대한산업공학회 2014 대한산업공학회지 Vol.40 No.1
Statistical process control (SPC) is an important technique for monitoring and managing the manufacturing process. In spite of its easiness and effectiveness, some problematic sides of application exist such that the SPC techniques are hardly reflect the changes of the process conditions. Especially, update of control limits at the right time plays an important role in acquiring a reasonable performance of control charts. Therefore, we propose the control chart performance evaluation index (CPEI) based on count data model to monitor and manage the performance of control charts. The CPEI could indicate the degree of control chart performance and be helpful to detect the proper update cycle of control limits in real time. Experiments using real manufacturing data show that the proper update intervals are made by proposed method.
SeungYup Lee,KyoungHoon Kim,Tae Kim,SunMin Kim,JongWoo Kim,Changsu Han,JiYoung Song,JongWoo Paik 대한신경정신의학회 2015 PSYCHIATRY INVESTIGATION Vol.12 No.4
Objective-Non-adherence to medication is a recognized problem in psychiatric patients and may be one of the most challenging aspects of treatment for patients with schizophrenia. Failure of follow-up care after discharge greatly increases non-adherence to prescribed medications, relapse and rehospitalization. However, it is still unknown whether and how much outpatient follow-up visits can mitigate the risk of rehospitalization. Therefore we sought to investigate the continuity and effectiveness of outpatient care after inpatient discharge and its effect on rehospitalization of patients with schizophrenia. Methods-Data were extracted from National Health Insurance Claim Database covering the period from 2007 through 2010. We identified 10,246 patients aged 18 years or older who were admitted in psychiatric facilities with the diagnosis of schizophrenia between January 1 and December 31 in 2007. The number of outpatient visits within 60 days after discharge from index admission was defined as the indicator for the continuous care and rehospitalization was inspected during the following 36-month period. Cox’s proportional hazard model was used to examine the factors affecting the risk of rehospitalization including the number of outpatient visits, age, sex, comorbidities, antipsychotics, and characteristics of medical institution. Results-We found that 12.7% (n=1,327) of the patients visited psychiatric outpatient department once within 60 days after hospital discharge, 34.8% (n=3,626) twice, and 27.8% (n=2,900) more than three times. Patients taking atypical antipsychotics showed higher proportion in 2 or more outpatient visits, whereas patients taking typical antipsychotics showed higher proportion in one or no outpatient visits. Cox hazard ratios of rehospitalization for the factor of 3 or more outpatient visits referenced to that of no follow-up visit were 0.567 (0.428–0.750, 95% confidence interval) within 90 days, 0.673 (0.574–0.789) within 180 days, 0.800 (0.713–0.898) within a year, 0.906 (0.824–0.997) within 2 years, and 0.993 (0.910–1.084) within 3 years. Conclusion-Although continuous outpatient treatment is important for relapse prevention, patients with schizophrenia showed a low rate of outpatient visit as 62.6% of total patients in 2 or more visits within 60 days after discharge. Lack of follow-up treatment might lead to increase psychotic symptoms and raised risk of relapse and rehospitalization. Our data suggest that the number of outpatient visits within 60 days after discharge in patients with schizophrenia is an important indicator of rehospitalization within a year. Therefore, further efforts to examine factors affecting failure of outpatient follow-up after discharge are warranted.
Jongwoo Park,Jongsu Kim,Sung-Phil Kim 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
Pervasive healthcare and wireless health monitoring has been a central area to innovate novel personal and precise medicine for individuals. Many recent wireless health monitoring systems draw upon physiological signals acquired from wearable wristbands. However, most studies have paid attention to monitoring physical health states and relatively few efforts have been made to develop pervasive healthcare solutions for mental health. This study investigates a plausibility of the development of a wireless monitoring system for mental health in individuals by collecting and analyzing physiological signals from a wristband in naturalistic daily life environments. In particular, we aim to predict one’s mental stress level using the short-term heart rate variability (HRV) that is estimated from photoplethysmography (PPG) signals. Day-to-day measurements of PPG signals over a week along with a daily log of stress level were conducted three times a day for a week in each participant, in which participants performed measurements by themselves in their own living circumstances. Measurement times were distributed across noon, evening and night. The recorded signals were wirelessly transmitted to a smartphone via the Bluetooth link. The HRV feature of the ratio of high-frequency (0.15Hz - 0.4Hz) power over low-frequency (0.04Hz - 0.15Hz) power was used to predict individual daily stress levels. Prediction with the night measurements showed the highest accuracy compared to the measurements in other times; individual prediction accuracy reached as high as >90% using the night measurements. Across-subject validation of the proposed system demonstrated fair correlations between true and predicted stress scores, implying a possibility to generalize the system for populations. The results of this study may prove the possibility of the development of wireless mental health monitoring system in ambient environments.