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Development of a Scheduling Algorithm for Reconfigurable Manufacturing Cells
Jinwu Seo,Hanil Jeong,Jinwoo Park 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.1
RMCs (Reconfigurable Manufacturing Cells) are production systems which can rapidly change hardware configurations to respond to market variance. Given market demand, manufacturing performance may differ from hardware configurations. To evaluate and compare possible hardware configurations, scheduling may be required. Since schedules specify detailed resource allocation of hardware configurations in concern, managers may make decisions with certainty based on schedules. Previous studies, however, neither provided accurate evaluation of manufacturing performance, nor developed scheduling algorithms in consideration of hardware reconfiguration. The scheduling algorithms for hardware reconfiguration should perform consistent for various hardware configurations and generate schedules as fast as possible. This study aims to develop a scheduling algorithm for RMCs as a basic component of hardware reconfiguration. After a mathematical model which represents the scheduling problem is built, a lower boundbased look-ahead scheduling algorithm is proposed from the thorough analysis of the problem. Experimental result shows that the proposed algorithm generates schedules with performance near the lower bounds, higher than a constraint programming based search engine (iLOG CP) and benchmark dispatching rules, for various configurations and demands. It also appeared to generate schedules as fast as the dispatching rules.
Bias-dependent photoresponsivity of multi-layer MoS <sub>2</sub> phototransistors
Park, Jinwu,Park, Youngseo,Yoo, Geonwook,Heo, Junseok Springer US 2017 NANOSCALE RESEARCH LETTERS Vol.12 No.1
<P>We studied the variation of photoresponsivity in multi-layer MoS<SUB>2</SUB> phototransistors as the applied bias changes. The photoresponse gain is attained when the photogenerated holes trapped in the MoS<SUB>2</SUB> attract electrons from the source. Thus, the photoresponsivity can be controlled by the gate or drain bias. When the gate bias is below the threshold voltage, a small amount of electrons are diffused into the channel, due to large barrier between MoS<SUB>2</SUB> and source electrode. In this regime, as the gate or drain bias increases, the barrier between the MoS<SUB>2</SUB> channel and the source becomes lower and the number of electrons injected into the channel exponentially increases, resulting in an exponential increase in photoresponsivity. On the other hand, if the gate bias is above the threshold voltage, the photoresponsivity is affected by the carrier velocity rather than the barrier height because the drain current is limited by the carrier drift velocity. Hence, with an increase in drain bias, the carrier velocity increases linearly and becomes saturated due to carrier velocity saturation, and therefore, the photoresponsivity also increases linearly and becomes saturated.</P>
SiO<SUB>2</SUB>계열 젤화제 입자크기에 따른 니트로메탄 젤 추진제의 유변학적 특성 연구
장진우(Jinwu Jang),김시진(Sijin Kim),한승주(Seongjoo Han),김진곤(Jinkon Kim),문희장(Heejang Moon) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
본 연구에서는 이산화규소를 젤화제로 사용한 니트로메탄 젤 추진제의 유변학적 특성을 분석하였다. 니트로메탄 젤은 나노 또는 마이크로 입자 크기의 젤화제를 각각 5 wt%, 6.5 wt%, 8 wt% 함량으로 첨가하여 제작되였으며 점도 측정 실험은 회전형 점도계를 이용하여 측정을 수행하였다. 제작된 젤 추진제는 항복응력이 존재함을 확인하였고 측정 범위 전 구간에서 전단박화 거동을 보이며 나노 크기의 젤화제를 첨가한 젤 추진제의 경우 마이크로 크기 대비 낮은 전단속도(1 ~ 100 1/s) 영역에서 높은 점도를 보였다. 또한 니트로메탄 젤 추진제의 경우, Herschel-Bulkley 모델 보다는 Teipel과 Forter-Barth가 제시한 모델을 사용하는 것이 적합함을 확인하였다. In this study, the rheological properties of nitromethane gel propellants on nano/micron sized gelling agent are investigated. Silicon dioxide is used as the gellant with 5 wt%, 6.5 wt% and 8 wt% concentration, respectively, where the measurements are conducted under steady-state shear flow conditions using a rotational rheometer. The nitromethane/silicon dioxide gel showed non-Newtonian flow behavior for the entire experimental shear rate ranges. The gel fuels with nano-sized gellant had a slightly higher viscosity than the gel fuels with micron-sized one for low shear rate range. Additionally, it was found that Herschel-Bulkley model can hardly describe the rheological behavior of nitromethane gel propellant, but the NM model(by Teipel and Forter-Barth) is better suited to explain the rheological behavior of nitromethane gel propellant.
Xiaolei Ren,Jinwu Bai,Xingxing Gu,Hui Xu,Bochuan Tan,Shenying Xu,Jiangyu Hao,Fang Gao,Xin Li 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Imidazo-pyridazine and Bromo/Chloro-Imidazo-pyridazines are employed as the inhibitors for Al alloy in0.1 M HCl and 0.5 M HCl solutions. The electrochemical tests and adsorption model analysis revealed thatthree compounds are mixed-type inhibitors and Imidazo-pyridazine exhibited the best anti-corrosionperformance for Al electrode in HCl solutions by physicochemical. From electrochemical results, the bestanti-corrosion efficiency is 88.1 % for Al in 0.5MHCl with 2.0mMIP, while the efficiency is 75.5 % for Al in0.5 M HCl with 1.0 mM IP. The different inhibition behaviors result from the probability of the formationof AlCladsand N-onium ions. The formation of adsorption is due to the electrostatic attraction betweenAlCladsand N-onium ions. The surface topography test revealed that the Imidazo-pyridazine is the best corrosionbarrier for Al in 0.5 M HCl. The dynamic simulation demonstrated that the inhibition molecules andprotonated molecules can adsorb on the Al surface spontaneously with parallel adsorption configuration nomatter in more or less Cl- atmosphere.
Stability Analysis of Linear Uncertain Differential Equations
Xiaowei Chen,Jinwu Gao 대한산업공학회 2013 Industrial Engineeering & Management Systems Vol.12 No.1
Uncertainty theory is a branch of mathematics based on normolity, duality, subadditivity and product axioms. Uncertain process is a sequence of uncertain variables indexed by time. Canonical Liu process is an uncertain process with stationary and independent increments. And the increments follow normal uncertainty distributions. Uncertain differential equation is a type of differential equation driven by the canonical Liu process. Stability analysis on uncertain differential equation is to investigate the qualitative properties, which is significant both in theory and application for uncertain differential equations. This paper aims to study stability properties of linear uncertain differential equations. First, the stability concepts are introduced. And then, several sufficient and necessary conditions of stability for linear uncertain differential equations are proposed. Besides, some examples are discussed.
개방형 비즈니스 환경에서 주문 수용 수준 최대화를 위한 양방향 협상을 고려한 통합된 공급사슬계획 모델에 관한 연구
이성진(Sungjin Lee),서진우(Jinwu Seo),정한일(Hanil Jeong),박진우(Jinwoo Park) 한국경영과학회 2011 한국경영과학회 학술대회논문집 Vol.2011 No.5
본 연구는 개방형 비즈니스 환경 하에서 양방향 협상을 고려하는 공급사슬계획에 초점을 맞춘다. 본 연구에서 생산자는 자신의 생산능력과 공급자의 공급능력, 거래당사자간의 거래 주도권을 고려하고, 거래상에서 거래당사자간의 협상이 가능한 공급사슬계획 수립을 통해 효율적 생산계획 수립을 목표로 한다. 이 같은 요소들을 반영하기 위해 시나리오 기반으로 제시된 비즈니스 패턴별 공급사슬계획 문제를 도출한 후, 종합적으로 정리한 4가지 공급사슬계획 문제 유형 및 특징을 정의하였다. 또한 각 문제에 적용 가능한 수리모델을 제시하였으며, 실험을 통해 제안된 모델의 성능을 확인하였다.
Stability Analysis of Linear Uncertain Differential Equations
Chen, Xiaowei,Gao, Jinwu Korean Institute of Industrial Engineers 2013 Industrial Engineeering & Management Systems Vol.12 No.1
Uncertainty theory is a branch of mathematics based on normolity, duality, subadditivity and product axioms. Uncertain process is a sequence of uncertain variables indexed by time. Canonical Liu process is an uncertain process with stationary and independent increments. And the increments follow normal uncertainty distributions. Uncertain differential equation is a type of differential equation driven by the canonical Liu process. Stability analysis on uncertain differential equation is to investigate the qualitative properties, which is significant both in theory and application for uncertain differential equations. This paper aims to study stability properties of linear uncertain differential equations. First, the stability concepts are introduced. And then, several sufficient and necessary conditions of stability for linear uncertain differential equations are proposed. Besides, some examples are discussed.