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20대 한국 직장인의 음주 심각도에 대한 직무 스트레스와 BDNF 유전자 다형성의 역할
김보아,이상익,김시경,신철진,손정우,홍주봉,남영우,주가원,Kim, Bo-Ah,Lee, Sang-Ick,Kim, Sie-Kyeong,Shin, Chul-Jin,Son, Jung-Woo,Hong, Joo-Bong,Nam, Yeong-Woo,Ju, Ga-Won 대한생물정신의학회 2012 생물정신의학 Vol.19 No.2
Objectives : The aim of this study was to examine the effects of brain-derived neurotrophic factor (BDNF) genetic polymorphism and job stress on the severity of alcohol drinking. It was hypothesized that individuals with the Met/Met BDNF genotype would be more vulnerable than those carrying the Val allele. Methods : Participants were 133 healthy Korean adults (mean age $28.2{\pm}1.1$). Job stress and the severity index of drinking were investigated through self-reported questionnaires. BDNF (rs6265) gene was genotyped. Results : There was no significant association between job stress and the severity of alcohol drinking. Although the severity of alcohol drinking was not associated with BDNF genetic polymorphism, there was a significant difference in men according to genotype and job stress. Men with homozygous BDNF Met allele were more severe in alcohol drinking when job stress was high, less severe in alcohol drinking when job stress was low than those carrying the Val allele (F = 4.47, p = 0.038). Also higher level of job stress was correlated with higher severity of alcohol drinking in men homozygous for BDNF Met allele (rs = 0.620, p = 0.005). Conclusions : These findings suggest the possibility that Met allele could have differential susceptibility, with men homozygous for BDNF Met allele being more susceptible to both more adverse and less adverse environmental influences.
지하수 유동 방향에 대한 관정배열이 분배추적자 시험에 미치는 영향 분석
김보아,김용철,여인욱,고경석,Kim, Bo-A,Kim, Yongcheol,Yeo, In Wook,Ko, Kyung-Seok 한국지하수토양환경학회 2014 지하수토양환경 Vol.19 No.3
Partitioning interwell tracer test (PITT) is a method to quantify and qualify a site contaminated with NAPLs (Non-Aqueous Phase Liquids). Analytical description of PITT assumes that the injection-pumping well pair is on the line of the ambient groundwater flow direction, but the test-well pair could frequently be off the line in a real field site, which could be an erroneous factor in analyzing PITT data. The purpose of this work is to study the influence of the angle of the test-well pair on the ambient groundwater flow direction based on the result from PITT. From the experiments, it was found that the obliqueness of the test-well pair to the ambient groundwater flow direction could affect the tracer test resulting in a decreased NAPL estimation efficiency. In case of an oblique arrangement of the test-well pair to the ambient flow direction, it was found that the injection of a chase fluid could enhance the estimation efficiency. An increase of the pumping rate could enhance the recovery rate but it cannot be said that a high pumping rate can increase the test efficiency because a high pumping rate cannot give partitioning tracers enough time to partition into NAPLs. The results have a implication that because the arrangement of the test-well pair is a controlling factor in performing and interpreting PITT in the field in addition to the known factors such as heterogeneity and the source zone architecture, flow direction should be seriously considered in arranging test-well pair.
낙동강변 지하수 및 지표수의 주요원소 용존 농도 결정에 대한 막필터 공극 크기의 영향 분석
김보아,고동찬,하규철,Kim, Bo-A,Koh, Dong-Chan,Ha, Kyoochul 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.4
Various types of inorganic and organic colloids are present in natural water including groundwater. Previous studies showed that Fe, Mn and Al are colloid-forming elements and dissolved concentrations can be erroneous for these elements if water samples are not properly filtered. Dissolved concentrations of elements including Ca, Na, Mg, K, Fe, Mn, Si and Al in groundwater from alluvial and bedrock aquifers, and surface water near Nakdong River were determined to evaluate effects of colloids on dissolved concentrations in natural water samples using various pore sizes of filters. Groundwater is mostly anoxic and have elevated concentrations of Fe and Mn, which provides a unique opportunity to observe the effects of colloids on dissolved concentrations of colloid-forming elements. Membrane filters with four kinds of pore sizes of 1000 nm, 450 nm, 100 nm, and 15 nm were used for filtration of water samples. Concentrations of dissolved concentrations in each filtrate did not show significant differences from 1000 nm to 100 nm. However, concentrations of all elements considered were decreased in the filtrates obtained using 15 nm pore size filters by 10 to 15% compared to those using 450 nm except for bedrock groundwater. Al in surface water showed a distinct linear decrease with the decrease of filter pore sizes. These results showed that 100 nm pore size had little effect to remove colloidal particles in alluvial groundwater and surface water in our study. In contrast, significant concentration decreases in 15 nm pore size filtrates indicate that the presence of 15 to 100 nm colloidal particles may affect determination of dissolved concentrations of elements in natural water.
Fast model predictive control for autonomous vehicle
Bo-Ah Kim(김보아),Young Ok Lee(이영옥),Seung-Hi Lee(이승희),Youngseop Son(손영섭),Chung Choo Chung(정정주) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In this paper, we present how model predictive control (MPC) is applied to lane change system based on the vision module. The proposed MPC reduces computing time in finding constrained optimal solutions. For the case of fast systems, real-time solution is very difficult to get in the sample time for the system having complexity MPC formulation or many constraints. Weighted forgetting factors are introduced to find effective active constraints. The proposed fast MPC is quickly computable for not only complex MPC formulation but also in the case of no solution. Performance of the proposed control method is validated via simulations implemented in MATLAB/ Simulink and CarSim in real-time environment.
국내 의류상품개발과정에서 직종별 업무관여도 비교 - 테크니컬 디자인 업무 중심으로 -
김보아 ( Bo Ah Kim ),남윤자 ( Yun Ja Nam ),이재일 ( Jaeil Lee ),윤미경 ( Mi Kyung Yoon ) 한국의류산업학회 2016 한국의류산업학회지 Vol.18 No.5
The purpose of this study is 1) to research how practitioners in fashion industry in South Korea perceive concepts of Technical Design/Designer, 2) to compare and analyze issues at work by occupation, 3) to research specific works in garment development process, and 4) to compare and analyze work involvement by occupation, type of a company and etc, and 5) to propose the role of Technical Designers in apparel companies in South Korea. There were two methods to conduct this study, which were in-depth interview and survey. Both methods were conducted to designers, merchandisers, pattern makers, technical designers, and production coordinators. Frequency analysis, ANOVA, Duncan test, and Factor analysis were performed to get results by using SPSS 18.0 program. The results are following. There were 50 works during garment development process from the result of in-depth interview, and 6 factors were obtained from the result of Factor analysis, which were ‘Works about Sample in Sample Development Process’, ‘Works about Product’s Pattern and Size Spec’, ‘Works about Development of Garment’s Design’, ‘Works about Planning of Product Development and Management of Product in Stock’, ‘Works about Production Process’, and ‘Preparation Works for Sample Development’. In conclusion, technical designer in apparel companies in South Korea should be in charge of works about sample in sample development process and decision making of product’ size spec, which is included in works about product’s pattern and size spec. Also, they should complete technical package after product is developed by designers.
비젼 기반 자율주행을 위한 다중비율 예측기 설계와 모델예측 기반 능동조향 제어
김보아(Bo-Ah Kim),이영옥(Young Ok Lee),이승희(Seung-Hi Lee),정정주(Chung Choo Chung) 대한전기학회 2012 전기학회논문지 Vol.61 No.5
In this paper, we present model predictive control (MPC) applied to lane keeping system (LKS) based on a vision module. Due to a slow sampling rate of the vision system, the conventional LKS using single rate control may result in uncomfortable steering control rate in a high vehicle speed. By applying MPC using multi-rate Kalman filter to active steering control, the proposed MPC-based active steering control system prevents undesirable saturated steering control command. The effectiveness of the MPC is validated by simulations for the LKS equipped with a camera module having a slow sampling rate on the curved lane with the minimum radius of 250[m] at a vehicle speed of 30[m/s].
김보아(Bo-Ah Kim),손영섭(Youngseop Son),강대헌(Dae-Hun Kang),이승희(Seung-Hi Lee),정정주(Chung Choo Chung) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Autonomous driving vehicle control system uses a vision sensor to get road information. Such vision sensor may provide poor detection performance due to different line intensities, and characters or imperfect lane marks on the road. In this paper, we propose a new lane estimator which uses a vehicle kinematics model. The estimator can provide predictive virtual lane even when vision system cannot provides reliable lane information due to poorly detected road images. The performance of the proposed control method is validated via simulations implemented with CarSim and Matlab/Simulink.