• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.11a
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• pp.409-412
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• 2002

In this paper, We present a designe method for the PC User Interface. Also, the system implementation for T33521 is a interface controller of MMC and SSFCD card which operated with limit speed 12Mbit/s in USB Ver.1.1 and under circumstances windows 95, 98 and Mac Os 8.1. Using this controller, we implemented functional design such as automatic reading, memory block read/write, and file property of 8M/16M flash memory and 32M SMC.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.28 no.4
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• pp.238-243
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• 2015

The vegetable insulating oils are substitute for the mineral oil in power transformer. Vegetable insulating oils has higher flash/fire point and biodegradability than conventional mineral oils. In this paper, we investigated the dissolved gas analysis of vegetable oils. In the experiment, I had to accelerated aging under the same conditions mineral oil and vegetable oils. Accelerated aging proceeded to about 100% of the life of oil-filled transformer. In addition, we performed gas analysis of insulating oil of accelerated aging progress. The experiment results of the five gases was measured with the exception of Hydrogen and Acetylene. The mineral oil and vegetable oils gas is generated in a similar tendency depending on the accelerated aging. As a result, vegetable oils, can be dissolved gas analysis by method such as mineral oil.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2004.04a
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• pp.250-253
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• 2004

Emphasis has been placed on thin plate fabrication of plain woven carbon fabric reinforced Al matrix composites using liquid pressing process. The composite has potential applications for PDP rear plate. The process is to use the low pressure for infiltration of Al melt into plain woven carbon fabric as the Al melt is pressurized directly. The minimum pressure required for the infiltration was calculated from force balance equation, permeability measurements and compaction behavior of carbon fiber. Also, the melting temperature and the holding time have been optimized. In order to measure coefficient of thermal expansion (CTE) of the composites, the thermal strain measurement using strain gage was performed and the thermal conductivity of the composites was measured using laser flash method. The constituent materials of the composite are PAN type carbon fibers as reinforcements and 6061 Al alloys as matrices.

• Journal of the Korea Society of Computer and Information
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• v.15 no.6
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• pp.153-158
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• 2010

This paper is implemented new shopping mall by using Ajax(Asynchronous Javascript and XML) technique which makes loading speed down and user-friendly user interface that is different to other Web sites dependent on only flash technique. So this paper is designed and implemented by using ajax technique that makes confirm with eyes of client instantly and insert/delete goods very easily. Additionally, it makes pay attention to shopping and service convenience by adapting simple drag and drop method.

• Journal of Institute of Control, Robotics and Systems
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• v.15 no.9
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• pp.899-905
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• 2009

There are many different types of surface defects on semiconductor Integrated Chips (IC's) caused by various factors during manufacturing process, such as Scratch, Flash, Resin bleed, and Melting. These defects must be detected and classified by an inspection system for productivity improvement and effective process control. Among defects, in particular, Resin bleed and Melting are the most difficult ones to classify accurately. The brightness value and the shape of Resin bleed and Melting defects are so similar that normally it is difficult to classify the Resin bleed and Melting. In this paper, we propose a segmenting method and a set of features for detecting and classifying the Resin bleed and Melting defects.

• Proceedings of the KIEE Conference
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• 2003.07c
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• pp.1508-1510
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• 2003

비접촉 방식인 광 삼각측량법(optic triangulation method)에 의한 고정도 변위센서를 반도체 레이저 다이오드와 리니어 CCD를 이용하여 구현하였다. 개발한 고유의 알고리듬을 채용하여 측정 분해능 보다 적은 CCD pixel(256 pixel)로 고분해능(2,560분해능, $4{\mu}m$)을 실현함으로써, 결과적으로 저가이며 소형의 고정도 변위센서를 개발하였다. 또 검출물체의 색상이나 재질에 따른 검출특성의 현저한 차이를 보상하기 위하여 LFTC(laser flash time control)과 AGC(auto gain control)을 적용하여 안정된 검출결과를 얻을 수 있었다. 개발된 변위센서의 특성은 다음과 같다. 측정 거리:30mm, 유효측정 범위: -5.09${\sim}$5.10mm, 분해능:4um, 직선성:${\pm}1%$.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2005.05a
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• pp.428-431
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• 2005

This paper describes the process design for hot forging of bearing hub. Forging processes of bearing hub are simulated using the rigid-plastic finite element method. In the process called closed die forging without flash, the design of blocker geometry is of critical importance. Forging processes designs are take advantage of computer aided Process planning and experts. But that is difficult to predict metal flow line. So the preform is designed by the expert, and modified through predict metal flow line by CAE. This paper is to approach preform design considered defect such as metal flow and unfitting etc. at the finisher process.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.1121-1124
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• 2012

열-지향 데이터베이스 시스템인 C-Store는 많은 상용 데이터베이스 시스템과는 달리 데이터를 행(row) 위주가 아닌 열(column) 위주로 저장을 하여, 데이터 웨어하우스와 같이 주로 읽기 IO를 유발하는 환경에서 데이터의 전송량을 줄임으로써, 높은 성능을 보였다. 본 논문에서는 대표적인 열 지향 저장 DBMS인 C-Store와 행 위주의 저장구조를 사용하는 기존 DBMS와의 차이점을 알아보고, C-Store의 저장장치로 하드디스크와 차세대 저장장치로 주목받고 있는 플래시 SSD(Solid State Disk)를 사용하였을 때, 발생할 수 있는 장단점에 대해 분석하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.317-320
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• 2016

In embedded system, if firmware code is opened by other company, must devise hardware copy prevention. That guard valuable product. Not used security IC, Suggested platform is source code open method that prevent core code and hardware copy. And that open firmware code for other company programmer. Suggest system security platform based on Corex-M3. that consist of IAP(In-application programing) and APP(Applicataion). IAP contain core code and security confirm code. APP is implement by other company developer using core function prototype.

• Journal of the Semiconductor & Display Technology
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• v.22 no.1
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• pp.43-48
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• 2023

This paper discusses the design of 32Mbyte asynchronous nonvolatile memory modules, which includes self-diagnosis and RTC (Real Time Clock) functions to enhance their data stability and reliability. Nonvolatile memory modules can maintain data even in a power-off state, thereby improving the stability and reliability of a system or device. However, due to the possibility of data error due to electrical or physical reasons, additional data loss prevention methods are required. To minimize data error in asynchronous nonvolatile memory modules, this paper proposes the use of voltage monitoring circuits, self-diagnosis, BBT (Bad Block Table), ECC (Error Correction Code), CRC (Cyclic Redundancy Check)32, and data check sum, data recording method using RTC. Prototypes have been produced to confirm correct operation and suggest the possibility of commercialization.