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MODEL BASED OPTIMUM PID GAIN DESIGN OF ADAPTIVE FRONT LIGHTING SYSTEM
Shin Hyun Park,Byeong Uk Im,Dong Kyou Park 한국자동차공학회 2018 International journal of automotive technology Vol.19 No.5
Adaptive Front-Lighting System (AFLS) is a system which assists driver's field of vision by automatically controlling its brightness and illumination angle to adapt various driving conditions such as climate, traffic, road changes and so forth. This paper aims to propose novel model-based PID gain design method to improve the performances of Dynamic Bending Light (DBL) module that change horizontal angle of a system by applying Brent-Dekker algorithm that finds the root of nonlinear function and implementing Nelder-Mead simplex algorithm to the system reduction process. Along with the linear system model-based control theory, motor dynamics were modeled with frequency response. Validation of the prototype resulted in having less than 3 % error from the simulation, where position initialization and the real-time status monitoring function is available due to the closed loop control which enables over 3 times faster response than the conventional open-loop system.
Association between supervisors’ behavior and wage workers’ job stress in Korea
Shin Uk Kang,Byeong Jin Ye,ByoungGwon Kim,Jung Il Kim,Jung Woo Kim 대한직업환경의학회 2017 대한직업환경의학회지 Vol.29 No.-
Background: In modern society, many workers are stressed. Supervisors’ support or behavior can affect the emotional or psychological part of the worker. The purpose of this study is to investigate the effect of supervisor’s behavior on worker’s stress. Methods: The study included 19,272 subjects following the assignment of weighted values to workers other than soldiers using data from the Fourth Korean Working Condition Survey. Supervisors’ behavior was measured using 5 items: “supervisor feedback regarding work,” “respectful attitude,” “good conflict-resolution ability,” “good work-related planning and organizational ability,” and the encouragement of participation in important decision making. Job stress was measured using 1 item: “I experience stress at work.” Multiple logistic regression analysis was performed to examine the effects of supervisors’ behavioral, general, occupational, and psychosocial characteristics on job stress in workers. Organizational characteristics associated with supervisors’ behavior were also analyzed. Results: The results showed that supervisors’ provision of feedback regarding work increased workers’ job stress (OR = 1.329, 95% CI = 1.203 ~ 1.468). When a supervisor respect workers (OR = 0.812, 95% CI = 0. 722 ~ 0.913) or good at planning and organizing works (OR = 0.816, 95% CI: 0.732 ~ 0.910), workers’ job stress decreased. In particular, the two types of supervisor behaviors, other than feedback regarding work, were high in private-sector organizations employing less than 300 employees. Conclusion: Supervisors’ behavior influenced job stress levels in workers. Therefore, it is necessary to increase education regarding the effects of supervisors’ behavior on job stress, which should initially be provided in private-sector organizations with up to 300 employees.
( Byeong Ho Jeong ),( Jae Uk Song ),( Wooyoul Kim ),( Seo Goo Han ),( Yousang Ko ),( Junwhi Song ),( Boksoon Chang ),( Goohyeon Hong ),( Su Young Kim ),( Go Eun Choi ),( Sung Jae Shin ),( Won Jung Koh 대한결핵 및 호흡기학회 2013 Tuberculosis and Respiratory Diseases Vol.74 No.4
We report a rare case of lung disease caused by Mycobacterium lentiflavum in a previously healthy woman. A 54-year-old woman was referred to our hospital due to chronic cough and sputum. A computed tomography scan of the chest revealed bilateral bronchiectasis with bronchiolitis in the right middle lobe and the lingular division of the left upper lobe. Nontuberculous mycobacteria were isolated twice from three expectorated sputum specimens. All isolates were identified as M. lentiflavum by multilocus sequence analysis based on rpoB, hsp65, and 16S rRNA fragments. To the best of our knowledge, this is the first documented case of M. lentiflavum lung disease in an immunocompetent adult in Korea.
Melt-state miscibility of poly(ethylene-co-1-octene) and linear polyethylene
Shin, Kyusoon,Nam, Byeong Uk,Bang, Joona,Jho, Jae Young Wiley Subscription Services, Inc., A Wiley Company 2008 Journal of applied polymer science Vol.107 No.4
<P>On purpose to examine the effect of branch length on the miscibility of polyolefin blends, miscibility behavior of linear polyethylene/poly(ethylene-co-1-octene) blend was studied and compared to that of linear polyethylene/poly(ethylene-co-1-butene) blend. Miscibility of the blend was determined by observing the morphology quenched from the melt, and by using the relation between interaction parameter and copolymer composition. When the weight composition and molecular weight was the same, poly(ethylene-co-1-octene) was slightly more miscible with linear polyethylene than poly(ethylene-co-1-butene) was. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008</P>
( Byeong-gon Na ),( Gil-chun Park ),( Min-jae Kim ),( Sang-hoon Kim ),( Yong-kyu Chung ),( Sang-hyun Kang ),( I-ji Jeong ),( Jin-uk Choi ),( Hwui-dong Cho ),( Young-in Yoon ),( Shin Hwang ),( Ki-hun K 대한간학회 2020 춘·추계 학술대회 (KASL) Vol.2020 No.1
Aims: When the donor’s left lobe volume is <30%, donor selection for the right posterior section graft (RPSG) is based on the type III portal vein (PV) anatomical variation. Herein, we validated the selection of a donor with a type III PV variation for RPSG to prevent biliary complications (BCs) after single-graft (SG) and dual-graft (DG) living-donor liver transplantation (LDLT). Methods: The clinical data of recipients and donors with a type III PV variation for LDLT using an RPSG performed between January 2004 and June 2018 were retrospectively collected and analyzed to determine the occurrence of BCs. Results: The 26 LDLTs performed using an RPSG, including 20 DG LDLT cases, accounted for 0.6% of all LDLT cases (n=4,292). BCs developed in 6 recipients (23.0%), including biliary stricture in 4 (15.3%) and bile leakage in 2 (7.6%). No vascular complications occurred. The RPSG volume was significantly smaller in recipients with BCs than in those without BCs (400.8±79.9 vs. 504.1±96.5 ml, P=0.015). The bile duct types were A, B, C1, C2, and D in 6 (18.8%), 5 (15.6%), 3 (9.4%), 13 (40.6%), and 5 patients (15.6%), respectively. All the RPSGs had a single-orifice bile duct. The bile duct size of the RPSG was relatively smaller in recipients with BCs than in those without BCs (2.8±1.0 vs. 3.6±1.4 mm, P=0.237). Conclusions: When using an RPSG for SG and DG LDLTs, the selection of a donor with a type III PV variation can be feasible to prevent BCs.
Shin, Kyeong-Yong,Kim, Jin-Hyeok,Terner, Mathieu,Kong, Byeong-Ook,Hong, Hyun-Uk Elsevier 2019 Materials science & engineering. properties, micro Vol.751 No.-
<P><B>Abstract</B></P> <P>The effects of heat treatment conditions on the microstructure and the deformation behavior of Haynes 282 superalloy in tension at 750 °C were investigated. The standard 2-step aging heat treatment (1010 °C/2 h + 788 °C/8 h) was compared to alternative, more economical, 1-step aging treatment (800 °C/4 h). Moreover, three different cooling rates from the solution temperature of 1135 °C were studied to represent the effective cooling rates that large-scale components may experience. Regardless of the heat treatment conditions, as much as about 20% of fine spherical intragranular γ' particles were successfully precipitated with an average size between 12 nm and 39 nm. The average γ' particles size increased as the cooling rate from the solution temperature decreased. All four heat-treated alloys exhibited good mechanical properties at the high temperature of 750 °C with a yield strength in particular well over 620 MPa. As it could be expected, the yield strength increased and the ductility decreased as the average γ' particles size decreased. The alloys exhibited a mixed mode of deformation characterized by shearing and bypassing. However, the dominant deformation mechanism depended on the γ' characteristics resulting from different heat treatment conditions: only 1-step aged specimens with the largest γ' particles of 39 nm size, which was furnace-cooled from solution temperature, exhibited a plastic behavior typical of a dislocations shearing mechanism while the other alloys showed primarily an Orowan dislocations bowing and looping mechanism behavior. The major operative deformation mechanism could be well predicted by strength increment calculations based on the precipitation strengthening model. Our results suggest that wrought Haynes 282 produced by a more economical 1-step aging treatment may be a reliable candidate for high temperature applications under advanced ultra-super-critical (A-USC) conditions.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>