• Proceedings of the Korean Operations and Management Science Society Conference
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• 2004.05a
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• pp.387-390
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• 2004

인터넷 기반의 글로벌 e-비즈니스 환경에서 고객과 실시간으로 납기를 확약할 수 있는 기능이 수주생산 기업의 경쟁력의 핵심요소로 부상하고 있다. 수주생산형 제조기업이 납기확약을 위해서는 수주시 생산능력을 고려하여 납기를 확약해줄 수 있는 생산능력 납기확약 시뮬레이션 엔진을 위한 알고리즘이 필요하다. 본 연구에서는 이를 위한 생산능력 납기확약 시뮬레이션 엔진의 알고리즘을 제시한다. 본 연구의 결과로 복수의 공장과 다양한 생산라인을 갖춘 복잡한 제조시스템의 스케쥴링을 빠른 시간 내에 도출해 냄으로써 고객에게 빠른 시간내에 정확한 납기확약이 가능해져 기업 경쟁력 강화에 크게 기여할수 있다.

• Journal of the Microelectronics and Packaging Society
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• v.18 no.4
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• pp.91-95
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• 2011

The light extraction efficiency in GaN based LED was analyzed qualitatively. The extraction efficiency was simulated with patterned shape, depth, size and spacing by using ray-tracing simulation. In simulation result, patterned shape and depth for the optimized extraction efficiency in PSS LED were in indented Hemi-sphere solid. Through the optimal patterning of the various factors, about 40% enhancement in extraction efficiency was obtained.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.386-390
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• 2004

유무선 혼합 망에서 GFR서비스의 최소대역, 효율 및 트래픽 제어를 위한 버퍼관리 기법 등을 유무선 혼합망의 셀기반 네트워크에서 가중치를 높이는 시뮬레이션을 통해 공평성을 입증하는 연구를 한다. GFR서비스는 TCP/IP 패킷의 품질보장과 베스트 에포트 트래픽에 대한 최소의 대역폭 보장을 하며, 가용 대역폭에 대한 공평성 있는 대역할당을 지원해야 하기 때문에 버퍼관리를 통한 셀 폐기와 셀 스케줄링 둥이 중요한 요소이다. 본 논문에서는 유무선 혼합 네트워크에서 MCR을 보장하기 위하여 버퍼의 사용 가능한 영역의 활성 VC에 각 VC가중치를 비례해 할당하는 per-VC 어카운트에 기초한 트래픽 제어의 버퍼관리에 대한 유동적 WBA알고리즘을 제안하고 GFR 서비스의 효율 및 공평성을 유무선 혼합 망 셀 기반의 스위치를 이용하여 시뮬레이션으로 결과를 보인다.

• Annual Conference of KIPS
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• 2019.10a
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• pp.401-404
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• 2019

최근 국가기반시설 산업제어시스템은 시나리오를 기반으로 시뮬레이션 훈련을 진행한다. 그러나 국내 ICS 보안 기술은 외부 경계 보호에 중점을 둔 시나리오가 대다수였기 때문에 내부에서 발생할 수 있는 시나리오 가이드라인이 상대적으로 부족하고 이를 평가하는 기준 또한 제대로 정의되어 있지 않다. 내부 공격이 증가함에 따라 국내에서도 사회공학적 기법에 초점을 둔 시뮬레이션 훈련을 진행할 필요가 있다. 이에 본 논문은 NEI 08-09 의 운영·관리항목 중 가장 빈번하게 발생하는 위협을 바탕으로 한 시나리오 및 구성요소를 개발하고, 이를 평가할 수 있는 명확한 기준을 제시하여 효과적인 비상대응 훈련을 수행할 수 있도록 한다.

• Journal of the Korea Society for Simulation
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• v.19 no.4
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• pp.235-247
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• 2010

An environmental factor is very important in a war game model supporting military training. Most war game models in Korean armed forces apply the same weather conditions to all operation areas. As a result, it fails to derive a high-fidelity simulation result. For this reason this study attempts to develop factor techniques for a high-fidelity war game that can apply distributed synthetic atmospheric environment modeling data to a military simulation. The major developed factor technology of this study applies regional distributed precipitation data to the 2D-GIS based Simplified Detection Probability Model(SDPM) that was developed for this study. By doing this, this study shows that diversely distributed local weather conditions can be applied to a military simulation depending on the model resolution from theater level to engineering level, on the use from training model to analytical model, and on the description level from corps level to battalion level.

• The Journal of Society for e-Business Studies
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• v.17 no.1
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• pp.91-110
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• 2012

Recently the effort of retailers improving the efficiency of store operations by using the information technology (IT) is increasing. Among them, the analysis of the shoppers' flow in retail stores is one of the critical tasks since it is an essential part in optimizing store layout and item grouping, and in developing the customized services specialized to shoppers' classification. Agent-Based Modeling and Simulation (ABMS) is one of the most promising methods which support analyzing the shoppers' flow. In this paper, we suggested a shopper's behavior model and developed an agent-based simulator for optimizing the operations of retail stores. In order to model the shoppers' behavior, we analyzed the behavioral characteristics of shoppers based on their shopping lists, suggesting BDI-based agent models of the shoppers' behavior. The shopping agent model were suggested, which has an additional mental state, the shopper's behavioral characteristic, as well as the original mental states of the BDI theory which has beliefs, desires and Intentions. The result of this study can be used in as a preliminary study for modeling and simulation of retail stores congestion and in the end the optimization of item grouping and store layout.

• Journal of Internet Computing and Services
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• v.17 no.4
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• pp.35-42
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• 2016

Recently many researches have been focused on the use of the markerless augmented reality system using face, foot, and hand of user's body to alleviate many disadvantages of the marker based augmented reality system. In addition, most existing augmented reality systems have been utilized rigid objects since they just desire to insert and to basic interaction with virtual object in the augmented reality system. In this paper, unlike restricted marker based augmented reality system with rigid objects that is based in display, we designed and implemented the markerless augmented reality system using deformable objects to apply various fields for interactive situations with a user. Generally, deformable objects can be implemented with mass-spring modeling and the finite element modeling. Mass-spring model can provide a real time simulation and finite element model can achieve more accurate simulation result in physical and mathematical view. In this paper, the proposed markerless augmented reality system utilize the mass-spring model using tetraheadron structure to provide real-time simulation result. To provide plausible simulated interaction result with deformable objects, the proposed method detects and tracks users hand with Kinect SDK and calculates the external force which is applied to the object on hand based on the position change of hand. Based on these force, 4th order Runge-Kutta Integration is applied to compute the next position of the deformable object. In addition, to prevent the generation of excessive external force by hand movement that can provide the natural behavior of deformable object, we set up the threshold value and applied this value when the hand movement is over this threshold. Each experimental test has been repeated 5 times and we analyzed the experimental result based on the computational cost of simulation. We believe that the proposed markerless augmented reality system with deformable objects can overcome the weakness of traditional marker based augmented reality system with rigid object that are not suitable to apply to other various fields including healthcare and education area.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.37 no.7
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• pp.7-16
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• 2000

This paper reports a methodology and its application for extracting cell capacitances and parasitic capacitances in a stacked DRAM cell structure by a numerical technique. To calculate the cell and parasitic capacitances, we employed finite element method (FEM), The three-dimensional DRAM cell structure is generated by solid modeling based on two-dimensional mask layout and transfer data. To obtain transfer data for generating three-dimensional simulation structure, topography simulation is performed. In this calculation, an exemplary structure comprising 4 cell capacitors with a dimension of $2.25{\times}1.75{\times}3.45{\mu}m^3$, 70,078 nodes with 395,064 tetrahedra were used in ULTRA SPARC 10 workstation. The total CPU time for the simulation was about 25 minutes, while the memory size of 201MB was required. The calculated cell capacitance is 24.34fF per cell, and the influential parasitic capacitances in a stacked DRAM cell are investigated.

• Journal of the Korea Society for Simulation
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• v.29 no.2
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• pp.63-72
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• 2020

Tank, which is a representative ground weapon system, is one of the most important weapon systems in each country. For the cost-effective acquisition of a tank based on scientific analysis, the operational concept and effectiveness should be studied based on engagement simulation technology. Besides physical capabilities including maneuver and communication, logical models including decision-making of a tank commander should be developed systematically. This paper describes a method to model a tank for engagement simulation based on Base System Model(BSM), which is the standard architecture of the weapon system model in AddSIM, an integrated engagement simulation software. In particular, a method is proposed to develop logical models by hierarchical and modular approach based on human decision-making model. The proposed method applies a mathematical formalism called DEVS(Discrete EVent system Specification) formalism. It is expected that the proposed method is widely used to study the operational concept and analyze the effectiveness of tanks in the Korean military in the future.

• Journal of the Korea Society for Simulation
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• v.21 no.1
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• pp.27-34
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• 2012

Proposed in the paper is an agent based and object-oriented methodology to create a virtual logistics support system model. The proposed virtual logistics support system model consists of three types of objects: the logistics force agent model(static model), the military supplies transport manager model(function model), the military supplies state manager model(dynamic model). A logistic force agent model consists of two agent: main function agent and function agent. To improve the reusability and composability of a logistics force agent model, the function agent is designed to adapt to different logistics force agent configuration. A military supplies transport manager is agent that get information about supply route, make decisions based on decision variables, which are maintained by the military supplies state manager, and transport military supplies. A military supplies state manager is requested military supplies from logistics force agent, provide decision variables such as the capacity, order of priority. For the implementation of the proposed virtual logistics force agent model, this paper employs Discrete Event Systems Specification(DEVS) formalism.