• Korean Journal of Computational Design and Engineering
• /
• v.12 no.6
• /
• pp.452-460
• /
• 2007

To achieve rapid developments and cost savings in manufacturing industries including automotive die shops, new paradigm and its supporting systems of information managements through total product life cycle are needed for concurrent and collaborative engineering. For manufacturing of automotive press dies, integrated and efficient managements of PPR information including product, manufacturing process and resource are essential. In this paper, we introduce a PLM approach to achieve engineering collaborations in product development and production of automotive dies. To prove concepts and benefits of PPR information managements, we implement new business workflow and detail procedures, PPR information management system and other related applications. By PPR information managements in PLM, improvements in quality of engineering results and savings in time from design to production of dies are possible.

• Annual Conference of KIPS
• /
• 2010.04a
• /
• pp.255-258
• /
• 2010

계산 집약적인 다양한 응용 프로그램들이 서로 유기적으로 통합되어 결과를 도출하는 컴퓨팅 환경에서는 응용들을 관리하기 위한 효과적인 워크플로우 기법과 컴퓨팅 자원관리 기술이 필요하다. 본 논문에서는 인체 생리기능 단위들을 모사한 신약개발 시뮬레이션을 지원하기 위한 OSICC (e-Organ Simulator-Integrated Cyber Computing) 시스템의 협업 기능을 평가한다. 제안하는 시스템은 워크플로우 관리자를 이용하여 시뮬레이션의 객체간 자원관리를 최적화하고 있으며, 프로토타입으로 구현되어 협업 컴퓨팅을 지원하는 OSICC 시스템에서 효율성을 확인하였다.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.42 no.4
• /
• pp.116-125
• /
• 2019

The Dynamic Vehicle Routing Problem (DVRP) involves a combinatorial optimization problem where new customer demands become known over time, and old routes must be reconfigured to generate new routes while executing the current solution. We consider the high level of dynamism problem. An application of highly dynamic DVRP is the ambulance service where a patient contacts the service center, followed by an evaluation of case severity, and a visit by a practitioner/ ambulance is scheduled accordingly. This paper considers a variant of the DVRP and proposes a decentralized algorithm in which collaborators (Depot and Vehicle), both have only partial information about the entire system. The DVRP is modeled as a periodic re optimization of VRP using the proposed decentralized algorithm where collaborators exchange local information to achieve the best global objective for the current state of the system. We assume the existence of a dispatcher e.g., headquarter of the company who can communicate to vehicles in order to gather information and assigns the new visits to them. The effectiveness of the proposed decentralized coordination algorithm is further evaluated using benchmark data given in literature. The results show that the proposed method performed better than the compared algorithms which utilize the centralized coordination in 12 out of 21 benchmark problems.

• Journal of the Society of Naval Architects of Korea
• /
• v.48 no.3
• /
• pp.215-221
• /
• 2011

To improve the naval ship acquisition process, systems engineering, modeling and simulation, etc. have been introduced, and there has been ongoing research on acquisition systems for effective support of it. However, due to characteristics of the naval ship acquisition process, development process mainly carried out at a shipyard such as basic design, detailed design, construction and test is difficult to integrate with the acquisition systems of IPT(Integrated Project Team). In addition, research aimed to improve this is rather lacking. In this paper, the naval ship product structure concept proposed in previous research was applied to the basic design system at shipyard, and basic research for expanding the coverage of naval ship acquisition systems to the basic design phase is performed. A data structure of modeling system appropriate to the basic design phase was proposed through research findings and the prototype system based on it was implemented.

• Korean Journal of Computational Design and Engineering
• /
• v.7 no.2
• /
• pp.110-120
• /
• 2002

This paper presents the method that allows easy and rapid integration of legacy resources within the company and between departments. The proposed system can easily construct a distributed environment for collaborative design between departments in the companies. It supports knowledge-based integration system, which allows designers to develop product with deep knowledge about product design. For the purpose, DOME (Distributed Object-based Modeling Environment)-which has been developed through various studies-was used in this paper. To overcome its problems and insufficiency, the Web-Integrator is proposed. The Web-Integrator is very suitable for an Internet environment because it uses HTTP (Hyper Text Transfer Protocol) and XML (extensible Markup Language) as its main communication method. By supporting the remote object access via URL (Uniform Resource Locator), the implementation of the integrated system makes the Web-Integrator systematic and intuitive. All the functions and resources provided by DOME could be used with the interface that enables bi-directional communication with the DOME system. Web-Integrator provides full web-based environments for the general designers, who do not have a full design knowledge and experience, and the proposed system allows design operations to happen at any place and anytime. Also it provides XML-RPC(Remote Procedure Call) based web service framework, which allows other systems to use easily the service that the DOME system supplies regardless the location and the platform.

• Journal of the Korea Convergence Society
• /
• v.9 no.8
• /
• pp.53-60
• /
• 2018

Domestic public e-procurement has been recognized excellence at home and abroad. However, it is difficult for procurement companies to check the related announcements and to grasp the status of procurement announcements at a glance. In this paper, we propose an e-Procurement Announcement Analysis Support System using the HDFS, HDFS, Apache Spark, and Collaborative Filtering Technology for procurement announcement recommendation service and procurement announcement and contract trend analysis service for effective e-procurement system. Procurement announcement recommendation service can relieve the procurement company from searching for announcements according to the characteristics and characteristics of the procurement company. The procurement announcement/contract trend analysis service visualizes the procurement announcement/contract information and procures It is implemented so that the analysis information of electronic procurement can be seen at a glance to the company and the demand organization.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2005.06a
• /
• pp.822-827
• /
• 2005

Recently engineering systems problems become quite large and complicated. For those problems, design requirements are fairly complex. It is not easy to design such systems by considering only one discipline. Therefore, we need a design methodology that can consider various disciplines. Multidisciplinary Design Optimization (MDO) is an emerging optimization method to include multiple disciplines. So far, about seven MDO methodologies have been proposed for MDO. They are Multidisciplinary Feasible (MDF), Individual Feasible (IDF), All-at-Once (AAO), Concurrent Subspace Optimization (CSSO), Collaborative Optimization (CO), Bi-Level Integrated System Synthesis (BLISS) and Multidisciplinary Optimization Based on Independent Subspaces (MDOIS). In this research, the performances of the methods are evaluated and compared. Practical engineering problems may not be appropriate for fairness. Therefore, mathematical problems are developed for the comparison. Conditions for fair comparison are defined and the mathematical problems are defined based on the conditions. All the methods are coded and the performances of the methods are compared qualitatively as well as quantitatively.

• Journal of Korean Institute of Industrial Engineers
• /
• v.41 no.2
• /
• pp.185-208
• /
• 2015

The explosive growth of the world-wide-web and the emergence of e-commerce has led to the development of recommender systems. Recommender systems are personalized information filtering used to identify a set of items that will be of interest to a certain user. This paper reviews recommender systems and presents their pros and cons.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2011.07a
• /
• pp.82-84
• /
• 2011

본 논문에서는 사용자의 개인적 취향에 맞는 음악을 추천할 수 있는 사용자 감성/상황 정보 융합 기반의 협업 필터링의 확장을 이용한 음악추천시스템을 소개한다. 본 논문에서 제안하는 시스템은 확장된 협업 필터링 방식을 사용하여 추천을 해준다. 이를 위해 본 논문에서는 추천의 근거가 되는 감성과 무드를 Thayer 음악 무드 모델을 이용하여 총 12 가지의 감성 정보, 8 cluster 의 무드 정보로 분류했다. 또한 사용자의 상황 정보, 활동 & 날씨 & 시간에 대해서도 분류하였다. 분류된 정보는 음악감상 UI 를 이용하여 사용자 별 감성, 상황 그리고 음원의 무드 정보로 수집이 되었고, 수집된 정보를 기반으로 사용자 감성과 청취 곡 횟수를 퓨전하여 평가치 매트릭스를 만들었으며, 이를 바탕으로 단계적 협업 필터링에 의해 사용자 취향에 맞는 음악을 추천해 주는 방법이다.

• Annual Conference of KIPS
• /
• 2017.11a
• /
• pp.450-453
• /
• 2017

현대사회가 발전함으로 인해 사람들의 질이 높아졌고 보다 행복한 삶을 찾는 사람들이 많아졌다. 그로인해 공연 문화의 시장은 커졌고 공연의 종류와 수가 매우 많아졌다. 이에 따라 사용자에게 만족되는 조건과 가격의 공연을 추천하기란 어려운 일이다. 따라서 본 논문에서는 개인화 요인과 협업 필터링 방법을 이용하여 사용자에게 보다 적합한 공연을 추천하며 협업필터링의 큰 단점 중 하나인 희소성 문제에 대해 보다 나은 추천 시스템을 제안한다.