인지적 제조 시스템을 위한 공정 설계 전략-개념적 모형

김연민 울산대학교 1999 공학연구논문집 Vol.30 No.2

This study suggest conceptual models using experiential cognition, reflective cognition, and motivation variables and also develops propositions for empirical study by field observation. Job characteristic model for job design and recent cognitive engineering studies for process design are reviewed briefly. By using these concepts, lean production system was interpreted in terms of cognitive engineering and the latent dimensions of the lean production system are revealed as the application of cognitive engineering principles. Integrated process design framework for cognitive manufacturing system using job characteristic model is suggested for effective design of manufacturing system. Experiential cognition and reflective cognition make four possible modes of cognitive design-reactive mode, entrepreneurial mode, planning mode, adapting mode. Of which planning mode is regarded as the most important mode at the level of operator for manufacturing system design. By using dimensions of the task motivation potential and the experiential cognition, four process design strategies-machine resource centered process design strategy, human resource dependent process design strategy, machine resource dependent process design strategy, and human resource centered process design strategy-are suggested. In the complex and dynamic environment, human resource centered process design strategy is emphasized for effective manufacturing system. Propositions for empirical analysis of this model are also developed through theoretical analysis as well as field observation. Propositions are (1) experiential cognition and motivation potential affect the ability, role perception, and motivation of the operator in the manufacturing system (2) the ability, role perception, and motivation of the operator affect the manufacturing performance.

첨단제조기술의 타당성 평가를 위한 전문가 시스템의 개발

김연민 울산대학교 1993 공학연구논문집 Vol.24 No.1

본 연구는 첨단 제조기술의 평가를 위한 전문가 시스템을 INSIGHT 2 셀을 이용하여 개발하였다. 첨단 제조기술의 평가기법은 경제적 분석방법, 분석전 방법, 전략적 분석기법을 고려했으며, 실제로 점수법의 일종인 XVENTURE법을 이용, 첨단 제조기술의 도입 여부에 대한 평가를 하게 했다. In this study, expert system for the justification of advanced manufacturing technology was developed using Insight 2 shell. One of the justification approaches for advanced manufacturing technology, such as economic approach. analytic approach, and strategic approach could be selected in this expert system. Adoption of advanced manufacturing technology by xventure method was also protyped.

자동차 산업 생산 설비의 발전에 관한 연혁적 분석

김연민 울산대학교 1999 공학연구논문집 Vol.30 No.2

This study reveals the process of technology innovation in teh automobile industry which needs an integrated innovation, and suggests means for technological innovation in capital good by the longitudinal analysis and the deep case study of production processes and facilities of an automobile factory. This paper analyzes the course of the process innovation, its motives, the direction of its development, and compares the past processes with the present processes of the Hyundai Motor Company. An interview was conducted for a concrete and vivid understanding of the development of the production processes and facilities using predesigned interview form. As a result, the investment of the facilities and state of the in-house development of facilities, and the problems of localization were also revealed. In Conclusion, propositions for the technology innovation of capital goods industry and the means for fostering the capital goods industry were suggested.

Clinical effect of white matter network disruption related to amyloid and small vessel disease

Kim, Hee Jin,Im, Kiho,Kwon, Hunki,Lee, Jong-Min,Kim, Changsoo,Kim, Yeo Jin,Jung, Na-Yeon,Cho, Hanna,Ye, Byoung Seok,Noh, Young,Kim, Geon Ha,Ko, En-Da,Kim, Jae Seung,Choe, Yearn Seong,Lee, Kyung Han,Ki Ovid Technologies (Wolters Kluwer) - American Acad 2015 Neurology Vol.85 No.1

<P>We tested our hypothesis that the white matter network might mediate the effect of amyloid and small vessel disease (SVD) on cortical thickness and/or cognition.</P>

A Quick Sequencing Algorithm for a Mixed Model Assembly Line with Multiple Stations

Kim, Yearn-Min,Park, Changkwon,Choi, Wonjoon 한국경영과학회 2001 한국경영과학회 학술대회논문집 Vol.- No.1(1)

This paper addresses a quick sequencing algorithm for a mixed assembly line with multiple work stations where each product is characterized by the presence or absence of each of a set of available options. We compare the proposed algorithm with several heuristics of the sequencing problem that minimize the total utility works and show the computational experiences of the proposed heuristics.

Relative impact of amyloid-β, lacunes, and downstream imaging markers on cognitive trajectories

Kim, Hee Jin,Yang, Jin Ju,Kwon, Hunki,Kim, Changsoo,Lee, Jong Min,Chun, Phillip,Kim, Yeo Jin,Jung, Na-Yeon,Chin, Juhee,Kim, Seonwoo,Woo, Sook-young,Choe, Yearn Seong,Lee, Kyung-Han,Kim, Sung Tae,Kim, Oxford University Press 2016 Brain Vol.139 No.9

<P>Amyloid-beta deposition and cerebral small vessel disease are major contributors to age-related cognitive decline. In a longitudinal study of mild cognitive impairment, Kim et al. show that amyloid-beta and lacunes have differing effects on cognitive trajectories. Amyloid-beta has a greater impact on memory, and lacune number on frontal-executive function.Amyloid-beta and cerebral small vessel disease are the two major causes of cognitive impairment in the elderly. However, the underlying mechanisms responsible for precisely how amyloid-beta and cerebral small vessel disease affect cognitive impairment remain unclear. We investigated the effects of amyloid-beta and lacunes on downstream imaging markers including structural network and cortical thickness, further analysing their relative impact on cognitive trajectories. We prospectively recruited a pool of 117 mild cognitive impairment patients (45 amnestic type and 72 subcortical vascular type), from which 83 patients received annual follow-up with neuropsychological tests and brain magnetic resonance imaging for 3 years, and 87 patients received a second Pittsburgh compound B positron emission tomography analysis. Structural networks based on diffusion tensor imaging and cortical thickness were analysed. We used linear mixed effect regression models to evaluate the effects of imaging markers on cognitive decline. Time-varying Pittsburgh compound B uptake was associated with temporoparietal thinning, which correlated with memory decline (verbal memory test, unstandardized beta = -0.79, P < 0.001; visual memory test, unstandardized beta = -2.84, P = 0.009). Time-varying lacune number was associated with the degree of frontoparietal network disruption or thinning, which further affected frontal-executive function decline (Digit span backward test, unstandardized beta = -0.05, P = 0.002; Stroop colour test, unstandardized beta = -0.94, P = 0.008). Of the multiple imaging markers analysed, Pittsburgh compound B uptake and the number of lacunes had the greatest association with memory decline and frontal-executive function decline, respectively: Time-varying Pittsburgh compound B uptake (standardized beta = -0.25, P = 0.010) showed the strongest effect on visual memory test, followed by time-varying temporoparietal thickness (standardized beta = 0.21, P = 0.010) and time-varying nodal efficiency (standardized beta = 0.17, P = 0.024). Time-varying lacune number (standardized beta = -0.25, P = 0.014) showed the strongest effect on time-varying digit span backward test followed by time-varying nodal efficiency (standardized beta = 0.17, P = 0.021). Finally, time-varying lacune number (beta = -0.22, P = 0.034) showed the strongest effect on time-varying Stroop colour test followed by time-varying frontal thickness (standardized beta = 0.19, P = 0.026). Our multimodal imaging analyses suggest that cognitive trajectories related to amyloid-beta and lacunes have distinct paths, and that amyloid-beta or lacunes have greatest impact on cognitive decline. Our results provide rationale for the targeting of amyloid-beta and lacunes in therapeutic strategies aimed at ameliorating cognitive decline.</P>

Gray and white matter changes linking cerebral small vessel disease to gait disturbances

Kim, Yeo Jin,Kwon, Hun Ki,Lee, Jong Min,Cho, Hanna,Kim, Hee Jin,Park, Hee Kyung,Jung, Na-Yeon,San Lee, Jin,Lee, Juyoun,Jang, Young Kyoung,Kim, Sung Tae,Lee, Kyung Han,Choe, Yearn Seong,Kim, Yun Joong Ovid Technologies (Wolters Kluwer) - American Acad 2016 Neurology Vol.86 No.13

<P>Objective: To investigate the topographic changes of white matter (WM) integrity and cortical thickness related to gait disturbances and determine whether these neural correlates mediate the association between cerebral small vessel disease (CSVD) and gait disturbances. Methods: A total of 129 patients with subcortical vascular cognitive impairment were included. CSVD severity was quantified as global and regional WM hyperintensities (WMH) volume and lacune and microbleed numbers. Amyloid burdens were assessed using Pittsburgh compound B (PiB)-PET scanning. Gait score was measured using a standardized scale. WM integrity was assessed by applying tract-based spatial statistics. Cortical thickness was measured using surface-based methods. Path analysis for gait score was performed using regional CSVD markers as predictors and fractional anisotropy (FA) and cortical thickness as mediators. Results: Periventricular WMH (PWMH) volume was associated with gait score, regardless of other CSVD. PiB retention ratio was not associated with gait score. Gait score was correlated with FA in the frontal and parietal WM and bilateral corpus callosum and with cortical thinning in the bilateral frontal and lateral temporo-parieto-occipital regions. Path analysis for gait score showed that PWMH contributed to gait disturbances with the mediation of mean FA or cortical thickness. Conclusions: Our findings suggest that WMH-related cortical thinning as well as disrupted integrity of periventricular WM is linked to gait disturbances.</P>

Synergistic effects of longitudinal amyloid and vascular changes on lobar microbleeds

Kim, Yeo Jin,Kim, Hee Jin,Park, Jae-Hyun,Kim, Seonwoo,Woo, Sook-Young,Kwak, Ki-Chang,Lee, Jong Min,Jung, Na-Yeon,Kim, Jae Seung,Choe, Yearn Seong,Lee, Kyung-Han,Moon, Seung Hwan,Lee, Jae-Hong,Kim, Yun Ovid Technologies (Wolters Kluwer) - American Acad 2016 Neurology Vol.87 No.15

<P>Conclusions: Our findings suggest that amyloid-related pathology and hCSVD have synergistic effects on the progression of lobar microbleeds, providing new clinical insight into the interaction between amyloid burden and hCSVD on CMB progression and cognitive decline with implications for developing effective prevention strategies.</P>

모호인식도를 이용한 생산전략의 수립

김연민(Yearn-Min Kim) 한국시뮬레이션학회 1994 한국시뮬레이션학회 논문지 Vol.3 No.2

Parameter Extraction for the Static and Dynamic Model of IGBT

Han-Soo Kim,Young-Ho Cho,Il-Jung Kim,Byeong-Hoon Lee,Seong-Dong Kim,Yearn-Ik Choi,Min-Koo Han 전력전자학회 1992 ICPE(ISPE)논문집 Vol.1992 No.4

The static and dynamic models of IGBT for the SPICE simulation have been successfully developed. The various circuit model parameters are extracted from the I-V and C-V characteristics of IGBT and implemented into our model. The SPICE simulation employing new model results agree well with the experimental values.<br/>