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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Academia-Industrial cooperation Society
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The Korea Academia-Industrial cooperation Society
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Volume & Issues
Volume 2, Issue 2 - Dec 2001
Volume 2, Issue 1 - Jun 2001
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A Study on the Snap-fit Design System in Injection Molding
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 1~5
One of the major advantages of using engineering plastics is ease of part assembly through a locking mechanism known as a snap fit. The typical snap fit involves a short cantilever beam with a projection at the free end. which slides over a one way ramp on the mating part to lock in place. The tightness of the mechanism is determined by the lateral interference of the two sliding members If too small they become loose and can't hold together. while if too large. excessive force can be generated. causing failure of the cantilever beam during the assembly operation. Therefore. the accurate determination of the force-deflection relationship for cantilever beams is a key element in snap fit design. And also. the process of injection molding should be considered when cantilever beam is designed. But it is not easy for novice designers to design them appropriately because of the profound knowledge related to injection molding. In this paper. an intelligent design program has been developed and proposed to improve a conventional empirical design method.
Method for Manufacturing Single Prong Pendant Jewelry Using Trench Process
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 7~10
Recently, most jewelry design employ multiple prongs that grasp the front surface of the jewel to the metal frame To keep up with recent trends in fashion. jewelry manufacturers need to produce single-prong neckalces and earings constructed with non-precious metals. In responce to this demand, Ameth Development Division and The University of Seoul researched jointly and developed a technique for setting the jewel safely using a single prong with less weight. The setting process consists of making a small trench through the jewel at the mounting point and using a low melting point tin solder, to fill the trench and bonding with the prong. The application or this technology in the setting of a natural amethyst to a single 18K gold prong resulted in a 40% reduction in cost and weight and improvement of feeling for wearing.
Design and Fabrication of High Potential Cenerator for Cathod-ray Apparatus
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 11~18
The design method of high potential generator of diagnostic X-ray apparatus by using inverter is presented. For the high potential generator, a line filter, a rectifier, a Pulse width modulation control, bridge drive, a high potential transformer and a high potential rectifier circuit were adopted. The high potential generator with switching frequency to be 40 KHz is fabricated by using design method presented in this method. The experimental results are as followings; variable volts of 0∼620 V and variable currents 50∼500 mA.
Performance Study of Separator for Solid and Liquid using Rice Chaffs
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 19~23
The paper presents the development of separating system from the slash with solid and liquid. The materials of filter are used rice chaffs, which are widely found in the agricultural village. The performance of separator is experimentally shown through new developed measurement apparatus. The flow rates of the system are evaluated by changing the inlet pressure of slash, thickness of filter and size of particle concentration of rice chaffs. In this work the optimal design parameters can be obtained for the separator for solid and liquid. And in the results rice chaffs filter improve the performance of separator solid and liquid.
The TRIZ Theory and it′s Application
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 25~31
The TRIZ theory which was invented by Russian scientist Genrich Altshuller provides a systematic methodology for innovative engineering design in place of brainstorming. synectics, analogical thinking, which seeming1y high efficiency are still variations of the trials and errors method. TRIZ theory gives designer the ability to explore design solutions in fields other than his (her) own experience. Among several TRIZ theories, most widely used techniques in engineering field are contradiction theory. Su-Field analysis, physical phenomenon and effect and directed production evolution. which are described in this thesis and its application to conceptual design of high-speed train is performed as a case study of TRIZ theory.
A Knowledge-Based CAD System for Gate in Injection Molding
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 33~37
The synthesis of gates of injection-molded parts has been done empirically, since it requires profound knowledge about the gate design,. which is not available to designers through current CAD systems. GATEWAY is a knowledge module which contains knowledge to Permit non-experts as well as mold design experts to generate acceptable gate design of injection-molded parts. A knowledge-based CAD system is constructed by adding the knowledge module, GATEWAY, for gate synthesis and appropriate CAE programs for mold design analysis to an existing geometric modeler to provide designers, at the initial stage, with comprehensive process knowledge for gate synthesis. Performance analysis and feature-based geometric modeling.
Manufacturing of Connecting Rod Die using CAD/CAM Systems
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 39~43
This paper aims to manufacturing of connecting rod die using CAD/CAM systems. CAD/CAM systems are consist of CAD(MDT4.0), CAM(Z-MASTER) software and CNC milling machine. CAM software is purpose to G-code generation for CNC programming. Then CAM software and CNC milling machine are connect to RS-232-C cable for data network.
Development of Realtime Monitoring System for Automatic GAS Control
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 45~48
It is a quite duality concerning to control the temperature of single crystalline growth as it does when we get most of heat treating products. It is also important factor to control the temperature when we make the
(single crystalline) used to artificial jewels. glass of watches, and heat resistant transparent g1asses. Thus, it is a major interest to get the proper temperature in accordance with the time process while we are making mixture of oxygen and hydrogen to have the right temperature. In this paper. we will study of electrical valve positioning system with DC-Motor for the gas mixture to improve the quality of products.
Transmitted Noise Reduction Performance of Piezoelectric Single Panel through Piezo-damping
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 49~56
The possibility of a noise reduction of piezoelectric single Panels is experimentally studied. Piezoelectric single panel is basically a plate structure on which piezoelectric patch with shunt circuit is mounted. The use of piezoelectric shunt damping can reduce the transmission at resonance frequencies of the panel structure. Piezo-damping is implemented by using a newly proposed tuning method. This method is based on electrical impedance model and maximizing the dissipated energy at the shunt circuit. By measuring the electrical impedance at the piezoelectric patch bonded on a structure, an equivalent electrical model is constructed near the system resonance frequency. Resonant shunt circuit for piezoelectric shunt damping is composed of register and inductor in series, and they are determined by maximizing the dissipated energy throughout the circuit. The transmitted noise reduction performance of single Panel is tested on an acoustic tunnel. The tunnel is a tube with a square cross section and a loud speaker is mounted at one side of the tube as a sound source. Panels are mounted in the middle of the tunnel and the transmitted sound pressure across Panels is measured. By enabling the piezoelectric shunt damping noise reduction is achieved at the resonance frequencies as well. Piezoelectric single panel with piezoelectric shunt damping is a promising technology for noise reduction in a broadband frequency.
A Study on the Technical Development for the Exterior Wall System of Container House
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 57~63
This paper aims at searching the attentiveness and method in planning. design and construction procedure of the container house system where container is used as core framework. For this. we try to produce researching fundamental materials for the construction performance and design standards of steel house, and finish the sample exterior wall system of the container house. By applying this sample system to the two case study of container housing construction we find out that there are considerable efnciency of the cost saving and catch up schedule compared with existing brick housing construction system. This study is significant in that it shows future direction of technical development and investment on the prefabricate housing market through development of the prefabricated container housing system.
A Study on the Properties of Modified Asphalt Mixtures Using Cold Recycling Method
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 65~71
Recently the quantities of waste asphalt concrete at construction sites have increased greatly, but the maintenance and final disposal is very difficult problem. Therefore, we were faced with a worsening environmental problem brought about illegal measures. One of the most effective recycling method is cold recycling. This method will satisfy treatment and recycling of construction wastes. Also it is very important question in the preservation of environmental and natural resources. So, in this paper, we dealt cold recycling modified asphalt mixtures using emulsified asphalt to concern the effect of adding reclaimed asphalt concrete 30, 40, 50% and using SBR Latex for modified asphalt mixtures.
Transmitted Noise Reduction of Piezoelectric Smart Panels using Passive/Active Method in Wide Range frequency
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 73~79
In this paper, the transmitted noise reduction performance of piezoelectric smart panels is experimentally studied. The proposed piezoelectric smart panels are comprised of plate structure on which piezoelectric sensor/actuators are bonded and sound absorbing material is provided. It is a combination of passive and active approaches utilizing a passive effect at high frequencies and an active effect at low frequencies. To prove the concept of piezoelectric smart panels, an acoustic measurement experiment is performed. An acoustic tunnel is designed and its acoustic characteristics are tested. Below 800Hz, the tunnel exhibits a plane wave guide characteristics. When an absorbing material is bonded on a single plate, a remarkable transmitted noise reduction in mid frequency range is observed except the first resonance frequency. By enabling the active control of single smart panel with negative feedback control. about 10dB noise reduction is achieved at the resonance frequencies. The double smart panel got 4dB at the first resonance frequency and has more potential to reduce the transmitted noise in a wide range frequency. Piezoelectric smart panels incorporating passive absorbing material and active piezoelectric devices is a promising technology for noise reduction in a wide range frequency.
The Simulation and Research of Information for Space Craft(Autonomous Spacecraft Health Monitoring/Data Validation Control Systems)
Kim, H ; Jhonson, R. ; Zalewski, D. ; Qu, Z. ; Durrance, S.T. ; Ham, C. ;
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 81~89
Space systems are operating in a changing and uncertain space environment and are desired to have autonomous capability for long periods of time without frequent telecommunications from the ground station At the same time. requirements for new set of projects/systems calling for ""autonomous"" operations for long unattended periods of time are emerging. Since, by the nature of space systems, it is desired that they perform their mission flawlessly and also it is of extreme importance to have fault-tolerant sensor/actuator sub-systems for the purpose of validating science measurement data for the mission success. Technology innovations attendant on autonomous data validation and health monitoring are articulated for a growing class of autonomous operations of space systems. The greatest need is on focus research effort to the development of a new class of fault-tolerant space systems such as attitude actuators and sensors as well as validation of measurement data from scientific instruments. The characterization for the next step in evolving the existing control processes to an autonomous posture is to embed intelligence into actively control. modify parameters and select sensor/actuator subsystems based on statistical parameters of the measurement errors in real-time. This research focuses on the identification/demonstration of critical technology innovations that will be applied to Autonomous Spacecraft Health Monitoring/Data Validation Control Systems (ASHMDVCS). Systems (ASHMDVCS).
Antibacterial Effect of Phosphate System as Ag
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 91~94
Glass ceramics composed of (5-X)
(X=1 to 5) were prepared by melting process and 2 step heat treatment for nucleation at
and crystallization at
, Fabricated crystal phases were
. Antibacterial effects and characterizations of the glass ceramics as
O content were investigated. Staphylococcus aureus and Salmonella typhi were used in this study. Staphylococcus aureus and Salmonella typhi bacteria were removed 5 hours added after glass ceramics.
Jewelry Design Automization using a 3D CAD
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 95~99
We can embody a variable size of high classic industrial material. and jewelry design within 5 hours. using a rapid prototype 3D CAD, which includes 30 kinds of database selected by jewelry designers. If the jewelry can be investigated and the customer can modify it right away ; then the qualify of the jewelry is much better. Based on our investigation. we can reduce 30
of the development cost by using a standard database. We can also create a new design with complex design element in the database. Therefore, we may reduce the production time to less than 5 hours by using a Powerful technique system rather than producing hand-made jewelry, which can take more than 27 hours.
A Study on feature-based Design System for Mold and Moldbase
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 101~106
The integrated design system for injection molding has been studied. The current CAD system do not provide mold designers with necessary function for CAD/CAPP/CAE interface except the geometric modeling capability. This paper describes a feature-based CAD system for mold and moldbase design which enables the concurrent design and CIM, with integrated design procedure, at the initial design stage of injection molding A new design methodology and resulting feature data files for this design system are also discussed.
Characteristics of MR Fluids with Different Working Modes
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 107~113
This work presents field-dependent Bingham and response characteristics of MR fluids under shear and flow modes. Two different types of magneto-viscometers are designed and manufactured for the shear and flow modes. respectively. For the MR fluid to be tested, MRF-132LD of Lord co. is employed. The field-dependent yield stress is experimentally distilled at various temperatures using the magneto-viscometers. Time responses of the MR fluids to step electric fields are also evaluated under two operating modes.
An Integrated Design System Using Knowledge-Based Approach for the Rational Design of Injection-Molded Part and Mold
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 115~119
The design and manufacture of injection molded polymeric parts with desired properties is a costly process dominated by empiricism, including the repeated modification of actual tooling. This paper presents an knowledge-based synthesis system which can predict the mechanical performance of a molded product and diagnose the design before the actual mold is machined. The knowledge-based system synergistically combines a rule-based system with CAE programs. Hueristic know]edge of injection molding. flow simulation, and mechanical performance prediction is formalized as rules of an expert consultation system. The expert system interprets the analytical results of the process simulation, predicts the performance, evaluates the design and generates recommendation for optimal design alternatives.
A Study on the Effects of Credit Card Usage on Money Demand and Consumption
Journal of the Korea Academia-Industrial cooperation Society, volume 2, issue 2, 2001, Pages 121~127
The purpose of this paper is to verify and statistically analyze the effect of credit card expenditure on money demand. Statistical analysis was Performed regarding credit spending volume. Ml, M2, M3, non-monetary banking deposit (OFI) and many other parameters based on time-series data for 14 years, from 1985 to 1998. The results suggest that credit card is not the main cause of inflation or increase of money supply but it would become an economic creation on contributing to human life in the coming century. Therefore the monetary authorities must develop the credit card industry, so as to improve positive function of credit cards and to keep controlling some of its negative functions minimally.