• Transactions on Control, Automation and Systems Engineering
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• 제3권2호
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• pp.133-138
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• 2001

This paper describes a system that can used to recognize an unknown material regardless of the change of ambient tem-perature using temperature response curve fitting and fuzzy neural network(FNN). There are some problems to realize the recogni-tion system using temperature response. It requires too many memories to store the vast temperature response data and it has to be filtered to remove noise which occurs in experiment. And the temperature response is influenced by the change of ambient tempera-ture. So, this paper proposes a practical method using curve fitting the remove above problems of memories and nose. And FNN is propose to overcome the problem caused by the change of ambient temperature. Using the FNN which is learned by temperature responses on fixed ambient temperature and known thermal conductivity, the thermal conductivity of the material can be inferred on various ambient temperature. So the material can be recognized by the thermal conductivity.

• 한국정보과학회논문지:정보통신
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• 제37권5호
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• pp.403-408
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• 2010

센서 노드는 사막, 도시, 데이터 센터등과 같이 온도의 변화가 심한 환경에 설치될 수 있다. 특히 온도가 증가하게 되면 설정한 파워에 비해 출력되는 파워가 감쇄되기 때문에 RSSI와 같은 링크 품질의 저하를 초래하며, 패킷 손실이 발생될 수 있다. 무선 환경에서 온도의 변화를 보상하기 위한 노드간에 링크 품질의 변화를 파악하고 일련의 피드백 과정을 통하여 전송파워 제어하는 기존의 방법이 있으나, 추가적인 제어 패킷들이 많이 발생하는 문제점이 있다. 본 논문에서는 이러한 온도 변화에 따른 링크품질의 유지를 위하여 T2PC(Temperature-aware Transmission Power Control)를 제안하였다. T2PC는 각 노드에서 자체적으로 얻을 수 있는 온도정보를 이용하여 전송파워를 제어함으로서 감쇄된 랭크 품질을 보상하도록 하였다. 또한 기존의 피드백을 이용한 전송파워 제어 기법보다 적은 컨트롤 패킷으로 패킷 수신율을 향상시켰다.

• 한국생산제조학회지
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• 제22권5호
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• pp.824-830
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• 2013

In ultra-precision machining, the inside temperature should be controlled precisely. The important factors are environmental conditions (outside temperature, humidity) and temperature conditions (cutting heat, spindle heat). Thus, in this study, an environmental control cell for the ultra-precision machine that could control the inside temperature and minimize effects of the surrounding environment to achieve a thermal deformation of less than 400nm of a specimen was designed and verified through C.F.D. Further, a method that could control the temperature precisely by using a blower, heat exchanger and heater was evaluated. As a result, this study established a C.F.D technic for the environmental control cell, and the specimen temperature was controlled to be within $17.465{\pm}0.055^{\circ}C$.

• 한국정밀공학회지
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• 제22권7호
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• pp.155-163
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• 2005

Pressure heating rollers with temperature control were mounted to a flat cable laminating machine (FCLM). Pressure heating rollers should be heated up to the setting temperature $(175^{\circ}C)$ and kept on to producing good quality flexible flat cables (FFC). Existing Pressure heating rollers took more than 70minutes to the setting temperature and did not keep on the setting temperature in production. Temperature controller, electric power controller, material and diameter of rollers and heat capacities were changed to improve the temperature control of the pressure heat rollers for better production of the FFC. Thus, the reaching time to the setting temperature (RT), temperature stability time (TST) and temperature hunting (TH) were measured and compared with the existing pressure rollers case. The RT of A roller was shortened by 50minutes, and B roller was shortened by 15minutes. The TST of A roller was shortened by 13minutes, and B roller was shortened by 15minutes. The THs of both A and B rollers were settled up to ${\pm}5^{\circ}C$. Finally, the productivity of the FCLM and the quality of the FFC were increased.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.169-173
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• 1997

In this paper, auto measuring system for evaluating sensing reliability of infrared temperature sensors is developed. A developed system is composed of temperature controller, measuring sysytem and operating S/W. A constant temperature control of a chamber is accomplished by multi-heater using PI control. It is shown that the control resulte of temperature are well followed to the desired temperature value. The developed untegrated measuring system will increase reliability and productivity of products.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1400-1404
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• 2005

This paper presents the temperature control of aluminum plate by using Peltier element. Peltier effect is heat pumping phenomena by electric energy as one of the thermoelectric effect. So if current is charged to Peltier element, it absorbs heat from low temperature side and emits heat to high temperature side. In this experiment, Peltier element is used to control the temperature of small aluminum plate with current control and operating cooling fan only while cooling duration. Operating cooling fan only while cooling duration is proper to get more rapid heating and cooling duration. As a result of experiment, it takes about 100sec period to repeating temperature between $35^{\circ}C$ and $70^{\circ}C$ and about 80sec from $40^{\circ}C$ to $70^{\circ}C$ in ambient air temperature $25^{\circ}C$ and while operating cooling fan only in cooling duration. Future aim is to apply this temperature control method in actuating SMHA(special metal hydride actuator) which is applicable in Siver project acting in low frequency range by using Peltier element for heating and cooling.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 제3회 압연심포지엄 논문집 압연기술의 미래개척 (Exploitation of Future Rolling Technologies)
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• pp.57-65
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• 1999

This document illustrates the way to control of coiling temperature(CTC) of stip tail part in minimill process. The coiling temperature (CT) is very important fact in hot rolling process because the mechnical properties of strip depend on it. In mini-mill pocess, the speed pattern of rolling is different from that of conventional hot rolling. We have a lot of difficulties in controlling the coiling temperature at strip tail part, because after the strip tail is passed out the final stand, it's impossible to control the coiling temperature by using coiling speed. So we have CT deveiation in this gauge, about 160$^{\circ}C$ below in comparison with target CT. It's clear that deviation of mechanical properties(tensile strength, vield ratio etc) of strip to direction of length is so large, so we could not produce middle carbon steel, like this temperature condition. New coiling temperature control of strip especially in strip tail was developed. An innovative method for calculate the deceleration speed of strip tail has been implemented in CTC program, so called

• 한국지열·수열에너지학회논문집
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• 제17권4호
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• pp.36-45
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• 2021

In this study, to improve the indoor thermal environment of the radiant floor heating system, a study was conducted on the temperature change characteristics and energy consumption according to the change of the indoor air set temperature, the supply hot water temperature and the outdoor temperature. As for the control method, the on/off control and the thermal difference proportional control method proposed through previous studies were applied. In addition, in consideration of field applicability, numerical analysis was performed for the case where the indoor air temperature sensor was affected by the wall temperature. As a result, it was found that the temperature difference proportional control method is more effective for thermal comfort and energy saving than on/off control.

• 설비공학논문집
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• 제9권4호
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• pp.472-483
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• 1997

An experimental facility consisting of two $3{\times}4.4{\times}3.8m$ rooms identical in construction is built. Each room has a control system and storage tank supplying hot water to the radiant floor heating system. The facility enables simultaneous comparision of two different control stratigies each implemented in a separate room. The operating performance of three kinds of flow control scheme is tested and compared in this study : (i) conventional on-off control based on feedback from room air temperature (ii) TPSC(two parameter switching control) (iii) TPOC(two parameter on-off control). Results show that TPSC and TPOC using room air and surface temperature sequentially as feedback signal to control hot water supply is the better temperature regulation scheme than conventional control based on feedback from only room air temperature. They are good candidates for the room with radiant floor heating system under continuous and intermittent heating mode.

• 실천공학교육논문지
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• 제9권2호
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• pp.149-153
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• 2017

자동차센서는 차량제어에 필요한 인자들을 모니터링하여 얻어진 정보로부터 최적의 제어가 가능하도록 하는 역할을 하고 있다. 이러한 센서 중에서 운전자의 주행환경을 결정 짓는 것은 차량 내부의 온도 및 습도이며, 순간적으로 급변하는 특성이 있다. 이에 따라 차량 공조 시스템은 온도제어가 매우 복잡한데, 그 중에서도 온도 및 습도에 대한 관계를 명확히 규명하면 제어변수를 줄일 수 있다. 따라서 본 논문에서는 차량 내 온도 및 습도의 관계에 대해 서술하고 차량 내부의 온습도 제어 방식을 사례를 들어 제어 기술 측면에서의 문제해결 방법에 대해 제시한다.