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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Computational Design and Engineering
Journal Basic Information
Journal DOI :
Society of CAD/CAM Engineers
Editor in Chief :
Volume & Issues
Volume 15, Issue 6 - Dec 2010
Volume 15, Issue 5 - Oct 2010
Volume 15, Issue 4 - Aug 2010
Volume 15, Issue 3 - Jun 2010
Volume 15, Issue 2 - Apr 2010
Volume 15, Issue 1 - Feb 2010
Selecting the target year
Robust Optimization of a Lens System for a Mobile Phone Camera
Jung, Sang-Jin ; Min, Jun-Hong ; Choi, Dong-Hoon ; Kim, Ju-Ho ;
Korean Journal of Computational Design and Engineering, volume 15, issue 5, 2010, Pages 325~332
A lens system for mobile phone cameras is comprised of various lenses and designed so as to satisfy design requirements for responses such as a modular transfer function (MTF). However, it is difficult to manufacture and assemble camera modules to maintain the same performance compared with the designed camera modules, because of uncertainty. We should always design a lens system by considering uncertainty that can be caused by errors in the manufacturing and assembly process of mobile phone cameras. The robust optimization offers tools of making robust decisions with the consideration of design parameters, uncontrollable parameters, and the variance of the system. Using an efficient reliability analysis method and an optimization algorithm, we obtained robust optimization results that maximize the mean of MTF and minimize the standard deviation and proposed a new robust design process for a lens system.
Quantitative Discomfort Evaluation for Car Ingress/Egress Motions
Choi, Nam-Chul ; Shim, Ji-Sung ; Kim, Jae-Ho ; Lee, Sang-Muk ; Lee, Sang-Hun ;
Korean Journal of Computational Design and Engineering, volume 15, issue 5, 2010, Pages 333~342
This paper describes a novel quantitative discomfort evaluation method based on motion data and its application to discomfort analysis of ingress/egress motions for cars. To develop the discomfort evaluation model, we introduced the discomfort regression curve and the range of motion for each degree-of-freedom of the joints of a whole human body. The maximum discomfort value for the joints at a specific time is selected to represent the discomfort value of the whole body at the time. The results of the experiments and questionnaires support the claim that our discomfort measure matches experimental subjective discomfort levels.
A Study on Factory Review Using Virtual Reality Model based on P3R Information
Lee, Ju-Yeon ; Choi, Sang-Su ; Park, Yang-Ho ; Noh, Sang-Do ;
Korean Journal of Computational Design and Engineering, volume 15, issue 5, 2010, Pages 343~353
Time to market and cost-efficient production are some of the challenge that manufacturing industries face. Modern methods of engineering can't help such organizations attain competitive advantage. To help these situations, MEMPHIS (Middleware for Exchanging Machinery and Product Data in Highly Immersive Systems) was introduced as an approach that enables VE (Virtual Engineering) and links engineering applications with VR (Virtual Reality) solutions. Thus an environment is provided to implement virtual design reviews and enable the application of virtual prototyping methods. However MEMPHIS could just handle Product data for virtual design review and simulation. In this paper, we newly define and develop the extended MEMPHIS that enables virtual manufacturing with Process, Resource and Plant data as well as Product data.
Optimal Tool Length Computation of NC Data for 5-axis Ball-ended Milling
Cho, Hyeon-Uk ; Park, Jung-Whan ;
Korean Journal of Computational Design and Engineering, volume 15, issue 5, 2010, Pages 354~361
The paper presents an efficient computation of optimal tool length for 5-axis mold & die machining. The implemented procedure processes an NC file as an initial input, where the NC data is generated by another commercial CAM system. A commercial CAM system generates 5-axis machining NC data which, in its own way, is optimal based on pre-defined machining condition such as tool-path pattern, tool-axis control via inclination angles, etc. The proper tool-length should also be provided. The tool-length should be as small as possible in order to enhance machinability as well as surface finish. A feasible tool-length at each NC block can be obtained by checking interference between workpiece and tool components, usually when the tool-axis is not modified at this stage for most CAM systems. Then the minimum feasible tool-length for an NC file consisting of N blocks is the maximum of N tool-length values. However, it can be noted that slight modification of tool-axis at each block may reduce the minimum feasible tool-length in mold & die machining. This approach can effectively be applied in machining feature regions such as steep wall or deep cavity. It has been implemented and is used at a molding die manufacturing company in Korea.
Framework of Ship PLM System Based Upon Four-Tier Model
Kim, Seung-Hyun ; Lee, Jang-Hyun ; Lee, Kyung-Ho ; Suh, Heung-Won ;
Korean Journal of Computational Design and Engineering, volume 15, issue 5, 2010, Pages 362~374
Product Lifecycle Management (PLM) is an integrated business approach to manage the creation and distribution of product information throughout the product development process. From the product perspective, PLM encompasses a holistic approach to product development and product information management. It supports the integrated product information in conjunction with the efficient product structures and BOM (Bill Of Material), user interfaces, proper functions, design processes and enterprise integration. Therefore, PLM should not only satisfy required functions as an enterprise software but also offer a systematic method for the efficient application from the initial stage of its development. Recently, many shipyards have been considering the PLM as a strategic solution to get the efficient management of product information such as 3-D models, BOM, drawings, documents, and the other product data. Though many studies on PLM are performed, most of them are performed in a function-based approach adequate for mass productive assembly industries. It could not help having limitations on applying the proper PLM system to the shipbuilding business since the requirements of shipbuilding PLM are too diverse and huge to design the architecture. This study presents the PLM framework which effectively reflects the diverse requirements of shipbuilding PLM. In order to get the macroscopic architecture of shipbuilding PLM, authors suggest the four-tier architecture model which considers the various requirements collected from shipyards. Entities of ship design data are modeled BOM in terms of product structure and hierarchical class diagram. Applicable functions of shipbuilding PLM are also investigated by analysis of issues of ship design. Finally, by reflecting the design process of shipbuilding, To-Be ship design procedure cooperated with the suggested PLM framework has been summarized.
A Study on Augmented Reality based Interactive U-Manual for the Education of Transporter
Kim, Chung-Hyun ; Lee, Kyung-Ho ; Han, Eun-Jung ; Lee, Jung-Min ;
Korean Journal of Computational Design and Engineering, volume 15, issue 5, 2010, Pages 375~382
As the workers are getting old, they need to be expert in their fields. Expertise is an invaluable means of shipbuilding industries because of the technological advancements. Therefore, the workers have to attend training seminars and upgrade their technical knowledge. In shipbuilding industries, most workers operate transporters based on experience not on learning from specialization in the shipyard. It is needed for the workers of transporters to be educated technical manual and system. Thus, this research shows that educational system which is interactive and very effective with Augmented Reality(AR) for the non-specialist workers. The educational interactive system based on AR is very supportive and worth for the workers. This study considers the system which makes the workers reduce malfunction of the products and mistakes.
Judo-doll System Development for Enhancement of Judo's Performance
Park, Kang ; Shim, Cheol-Dong ; Kim, Eui-Hwan ; Kim, Sung-Sup ; Kim, Tae-Whan ;
Korean Journal of Computational Design and Engineering, volume 15, issue 5, 2010, Pages 383~392
The purpose of this study is to develop three Judo-doll systems for enhancement of Judo's performance. Traditional Judo training requires a human training partner. Unfortunately it is not always easy to find one. Multifunctional Judo-doll training system has therefore been developed, and is described here. The system consists of a dummy, a power generating mechanism, and kinematic links. The power-generating mechanism generates forces similar to those of a human, by adjusting deadweights and controlling powderbrake's forces. The powderbrake force is controlled by the microprocessor according to the exercise scenario. The kinetic links, which mimic a human training partner's motions, has been developed based on a
system's analysis of the movement of human training partners. This mechanism whose name is "L link-wire" consists of L type links, wire, roller, and dead weight. This mechanism generates the force that leads the link to the neutral position regardless the link is pushed or pulled. The lifting mechanism that lifts the doll when the one-armed shoulder throw skill is applied is also developed. A 32-bit microprocessor controls the whole system; it reads the loadcell data, controls the electromagnetic force, and communicates with a PC via Bluetooth. The training history, including loadcell data, date, and training time, is stored in the PC for analysis. This training system can be used to enhance the Judo performance of any self training player.
A Study on IDM Development for Automation of BIM-based Architectural Facade Design - Focused on Musical Proportion -
Heo, Kyu-Souk ; Choo, Seung-Yeon ;
Korean Journal of Computational Design and Engineering, volume 15, issue 5, 2010, Pages 393~402
Existing construction industry is composed of several processes with various characteristics. The tendency of current construction industry is getting complicated and diversified; it has limitation to solve problems through existing processes. As a problem-solving method, BIM (Building Information Modeling), environment to manage building life cycle from design and construction to management, is being suggested. Currently, BIM is only focused on technology development by engineers, and the automation of architectural theories is insufficiency except architectural design modeling. Therefore, this research aims to back up theses drawbacks through intellectual curtain wall arrangement by using musical proportions. In order to apply to construction automation, analysised of musical proportions method are performed. The BPMN-based Process Map is listed to develop IDM for the application to BIM Software.