• 한국자동차공학회논문집
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• 제24권4호
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• pp.425-431
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• 2016

The usage of Friction Stir Welding(FSW) technology has been increasing in order to reduce the weight in automobile industries. Previous studies that investigated on the FSW have focused on the aluminum alloy. In this study, Al6061-T6 alloy plates having 5 mm of thickness were welded under nine different conditions from three tool rotation speeds: 900, 1000 and 1100 rpm, and three feed rates: 270, 300 and 330 mm/min. Specimen size of Micro Shear Punch(MSP) test was $10{\times}10{\times}0.5mm$. The mechanical properties were evaluated by MSP test and Analysis of Variance (ANOVA). The specimens were classified by advancing side(AS), retreating side(RS), and center(C) of width of tool shoulder. The optimal welding condition of FSW based on micro strengh was obtained when the tool rotation speed was 1100 rpm and the feed rate was 300 mm/min. The maximum load measured AS, RS, and C in the weldment was measured 554.7 N, 642.9 N, and 579.2 N, respectively.

• 한국CDE학회논문집
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• 제1권2호
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• pp.150-157
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• 1996

The hob is considered as an effective gear cutting tool for achieving the various gears such as spur gear, helical gear, worm gear and so on. To enhance the productivity and precision of hobs and the competitive ability of domestic CNC hob relieving lathes, a CAM system for CNC hob relieving lathe needs to be realized. In this study, the CAM system is developed based on the personal computer and C language. Besides the automatic generation of CNC data, the developed CAM system has the various capabilities related to the generation of tool path, the cutting simulation for verifying the generated CNC data and forecasting the cutting time, the DNC operation for communicating the CNC data with CNC controller by RS232C port, and the estimation of undercut length for verifying the hob cutting conditions.

• 대한전기학회논문지
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• 제35권6호
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• pp.209-216
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• 1986

This paper describes the design of multi channel data acquisiton system for industrial process automation. The prototype hardware assembly consists of Z-80A microprocessor, 10-bit A/D converter with 16-channel analog multiplexor and related interface circuitry. The first order lag filter, which can be implemented without any particular computational problem has implemented in software, and the simulation results are shown. The protype system can communicate with a central processor through RS-232C, and can be used either as an intelligent stand-alone controller or as a satellite controller which can be monitored and controlled by a central processor. The singal conditioners for various temperature and humidity sensors are designed and experimental results are shown.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.478-478
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• 2000

In this paper, presents the design of mobile field robot controlled by microcomputer. The computer works as the supervisory system for decision making and sending command to control the field robot. An information from encoder, infrared sensors using for control task of the robot that can be interconnected with the computer through the serial communication RS422 standard. In this case, the user can design the program algorithm base on microcomputer in order to control and define the routing of the mobile robot. Moreover, the robot can be installed other equipment fer collect data such as picture, sound, temperature etc., in order to working in the dangerous area.

• 한국안전학회지
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• 제8권4호
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• pp.54-60
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• 1993

The purpose of this study is to develop a CAD/CAM system for automatic creation and manufacturing of three dimension objects. The computer system used in this study made RAM 2M, CPU 80386, VGA graphic card. The results in this paper are as follows ; 1. By interconnect PC(personal computer) and NC(numerical control) milling machine with RS232C connector, we was constructed with CAD/CAM system. 2. The developed algorithm in this study is able to be design of three dimension object on the computer CRT and manufacturing of NC milling machine. 3. Because of design and modifying on the PC of objects, we can be saving time, cost and improvable precision of objects. 4. Essentially, we expect industrial accident to reduse according as we takes advantage of CAD/CAM system.

• Asian-Australasian Journal of Animal Sciences
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• 제27권1호
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• pp.46-54
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• 2014

This study was conducted to investigate the effects of eucalyptus (E. Camaldulensis) crude oils (EuO) supplementation on voluntary feed intake and rumen fermentation characteristics in swamp buffaloes. Four rumen fistulated swamp buffaloes, body weight (BW) of $420{\pm}15.0$ kg, were randomly assigned according to a $2{\times}2$ factorial arrangement in a $4{\times}4$ Latin square design. The dietary treatments were untreated rice straw (RS) without EuO (T1) and with EuO (T2) supplementation, and 3% urea-treated rice straw (UTRS) without EuO (T3) and with EuO (T4) supplementation. The EuO was supplemented at 2 mL/h/d in respective treatment. Experimental animals were kept in individual pens and concentrate mixture was offered at 3 g/kg BW while roughage was fed ad libitum. Total dry matter and roughage intake, and apparent digestibilites of organic matter and neutral detergent fiber were improved (p<0.01) by UTRS. There was no effect of EuO supplementation on feed intake and nutrient digestibility. Ruminal pH and temperature were not (p>0.05) affected by either roughage sources or EuO supplementation. However, buffaloes fed UTRS had higher ruminal ammonia nitrogen and blood urea nitrogen as compared with RS. Total volatile fatty acid and butyrate proportion were similar among treatments, whereas acetate was decreased and propionate molar proportion was increased by EuO supplementation. Feeding UTRS resulted in lower acetate and higher propionate concentration compared to RS. Moreover, supplementation of EuO reduced methane production especially in UTRS treatment. Protozoa populations were reduced by EuO supplementation while fungi zoospores remained the same. Total, amylolytic and cellulolytic bacterial populations were increased (p<0.01) by UTRS; However, EuO supplementation did not affect viable bacteria. Nitrogen intake and in feces were found higher in buffaloes fed UTRS. A positive nitrogen balance (absorption and retention) was in buffaloes fed UTRS. Supplementation of EuO did not affect nitrogen utilization. Both allantoin excretion and absorption and microbial nitrogen supply were increased by UTRS whereas efficiency of microbial protein synthesis was similar in all treatments. Findings of present study suggested that EuO could be used as a feed additive to modify the rumen fermentation in reducing methane production both in RS and UTRS. Feeding UTRS could improve feed intake and efficiency of rumen fermentation in swamp buffaloes. However, more research is warranted to determine the effect of EuO supplementation in production animals.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 춘계학술대회논문집
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• pp.404-409
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• 2004

A compressor loop pipe is the most important part in a refrigerator from the view of structural vibration and noise. Vibration energy generated from a compressor's inner body is transmitted to the shell and outside through the loop pipe. For this reason it is very important to design a compressor loop pipe. But, for geometrical complexity and dynamic nonlinearity of the loop pipe, analysis and design of the loop pipe is very difficult. So the statistical and experimental methods have to be used for design of this system. The response surface method (RSM) becomes a popular meta-modeling technique f3r the complex system as this loop pipe. As starting point of loop pile's optimization, FEA model and simple experimental model are used instead of the real loop pipe model. After RS model was constructed, using sensitivity-based optimizer performed optimization for the loop pipe. And the moving least square method (MLSM) was applied to reduce the approximation error.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2002년도 추계학술대회 논문집
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• pp.289-294
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• 2002

Unlike Tubular Steel Tower, This Composite Material Tower is a low-technology Component, whose design is easy to optimize, and which therefore during the design process-lends itself easily as an object for possible cost reduction at very little effort. This may come in useful as the cost of a tower usually significant part of the total cost of a structure. This paper is written by the Composite Materials Tower which loaded Complex loading in Off and On shore. This Composite Material Tower is made by the Method of Filament Winding, and the Component of Composite Material is used by the Roving RS220PE-535. When it loaded Complex trading, there is a results which is bigger than steel tower deflection. We controlled this 1a18e deflection by stiffeners which has thickness 20mm. At last, Off and On Shore Tower which used Composite Materials is compared with Off and On Shore Tower which used Steel.

• 한국항공우주학회지
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• 제38권1호
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• pp.80-86
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• 2010

본 논문은 현재 KAIST 인공위성연구센터(SaTReC)에서 개발하고 있는 과학기술위성3호 (STSAT-3) 위성본체의 S대역 통신채널 중 송신기 개발에 관하여 서술하고 있다. STSAT-3의 통신시스템은 위성제어 및 상태정보 전송을 위하여 S대역을 사용하며 임무수행용 통신채널로는 X대역을 사용하고 있다. S대역 송신기(S band Transmitter, STX)는 변조기, 주파수 합성기, 파워 앰프, 전력공급기 로 구성되어 있다. 변조 방법으로는 주파수 천이방식(Frequency Shift Keying, FSK)을 사용 하며 위성체와는 RS-422통신 방식을 이용한다. STSAT-3의 STX는 모듈화에 근거하여 설계 및 제작 되었으며 1.5W(31.7dBm) 송신 출력에 1E-5 비트오율(BER) 성능을 만족한다. 현재 성능시험, 환경시험(진동시험, 열진공시험)을 성공적으로 마쳤다.

• 전자공학회논문지SC
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• 제46권5호
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• pp.44-51
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• 2009

본 논문에서는 전력선 통신을 이용한 에어컨 피크 전력 제어 시스템을 개발하였다. 기존의 유선 RS-485통신 방식의 경우 별도의 통신 선로 설치가 필요하여 기존 건물에 설치하기 어려운 문제점과 무선 통신 방식의 경우 차폐된 공간에서는 설치가 용이하지 못한 문제점을 전력선 통신 방식을 채택하여 개선하였다. 기존에는 단상에만 적용된 것을 3상 4선식에도 적용할 수 있도록 개선하여 국내 모든 전기 환경에서 설치가 가능하도록 하였다. 전력선 통신을 이용한 타 시스템의 경우 전력선 모뎀을 별도로 부착하도록 되어 있으나 본 논문에서는 일체형으로 설계 구현하여 안정성 및 경제성을 높였다. 따라서 본 시스템의 가장 큰 장점인 설치의 용이성, 안전성과 경제성으로 인하여, 보다 확대 적용이 가능하여 에너지 절약이 절실히 필요한 현 시점에서 에어컨 피크 전력 관리 시스템의 활성화에 크게 기여 할 수 있을 것이다. 본 논문에서 구현된 시스템의 검증은 원격 에어컨 제어기 및 전력선 게이트웨이에 대한 설계 검증 시험과 전체 시스템의 필드 시험을 통해 성능 및 신뢰성의 우수함을 검증하였다.