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  • Title/Summary/Keyword: heating control system

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Noise Reduction Method of Anyplace IH System with Alternative PDM Control Using PLL (PLL 기반 교번 PDM 제어를 통한 Anyplace IH 시스템의 용기 소음 저감 방안)

  • Kwon, Man Jae;Jang, Eunsu;Park, Sang Min;Lee, Byoung Kuk
    • Proceedings of the KIPE Conference
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    • 2020.08a
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    • pp.82-84
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    • 2020
  • 본 논문에서는 용기 소음 저감을 위해 Anyplace induction heating (lH) 시스템에 적합한 설계 방안을 제시한다. 다수의 워킹 코일 및 인버터를 적용한 Anyplace lH 시스템에서 인접한 코일들이 서로 다른 동작 주파수로 용기를 가열 할 경우 주파수 차이에 따른 용기 소음이 발생한다. 따라서 용기의 근접 가열 시 발생하는 소음을 저감하기 위한 방안들을 비교 및 분석하고 실험 및 시뮬레이션을 통해 phase locked loop (PLL)을 이용한 교번 pulse density modulation (PDM) 제어를 적용한 시스템 설계 방안에 대한 타당성을 검증한다.

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Development of A Validation System For Automatic Radiopharmaceutical Synthesis Process Using Network Modeling (방사성의약품 합성 프로세스 검증을 위한 네트워크 모델링)

  • Lee, Cheol-Soo;Heo, Eun-Young;Kim, Jong-Min;Kim, Dong-Soo
    • IE interfaces
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    • v.24 no.3
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    • pp.187-195
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    • 2011
  • The automatic radiopharmaceutical module consists of several 2-way valves, couple of syringes, gas supply unit, heating(cooling) unit and sensors to control the chemical reagents as well as to help the chemical reaction. In order to control the actuators of radiopharmaceutical module, the process is tabulated using spread sheet as like excel. Unlike the common program, a trivial error is too critical to allowed in the process because the error can lead to leak the radioactive reagent and to cause the synthesis equipment failure during synthesizing. Hence, the synthesis process has been validated using graphic simulation while the operator checks the whole process visually and undergoes trial and error. The verification of the synthesis process takes a long time and has a difficulty in finding the error. This study presents a methodology to verify the process algebraically while the radiopharmaceutical module is converted to the network model. The proposed method is validated using actual synthesis process.

A study on the Radiation Properties of Far-infrared and PTC Effect in the BaTiO3 system by MnO2 Amounts of Additives (MnO2 첨가량에 따른 BaTiO3계의 PTC효과와 원적외선 방사특성에 관한 연구)

  • Song, Min-Joon;Park, Choon-Bae;Kang, Dou-Youl
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1993.05a
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    • pp.3-5
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    • 1993
  • It is very important that a spectrum of reflectance is in accord wi th a spectrum of absorbance for a effective heating. Therefore. the objective of this study was to achieve a technical composite for material plan which PTC thermistor increase a radiation property of far-infrared and keep a characteristic of R-T The Ceramic speciman studies had the composition BaTiO3 with additive of 1.67 Al2O3, 3.75 SiO2, 1.25 TiO2, 0.15 Sb2O3 and 0.00-0.182 MnO2. MnO2 amounts of additives was both increase on the anomalous resistivity-temperature characteristics and high efficiency on the radiation properties bodies of far-infrared. This result shows that specimens produced high emissivity(average 0.8) of far-infrared at 4.5-15[μm] by measuring a characteristic of IR and R-T.

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Development of High Sensitive Integrated Dual Sensor to Detect Harmful Exhaust Gas and Odor for the Automotive (악취분별능력을 가진 자동차용 고기능 듀얼타입 집적형 유해가스 유입차단센서 개발)

  • Chung, Wan-Young;Shim, Chang-Hyun
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.7
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    • pp.616-623
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    • 2007
  • A dual micro gas sensor array was fabricated using nano sized SnO2 thin films which had good sensitivities to CO and combustible gases, or H2S gas for air quality sensors in automobile. The already existed air quality sensor detects oxidizing gases and reducing gases, the air quality sensor(AQS), located near the fresh air inlet detected the harmful gases, the fresh air inlet door/ventilation flap was closed to reduce the amount of pollution entering the vehicle cabin through HVAC(heating, ventilating, and air conditioning) system. In this study, to make SnO2 thin film AQS sensor, thin tin metal layer between 1000 and 2000\AA thick was oxidized between 600 and 800C by thermal oxidation. The gas sensing layers such as SnO2, SnO2(pt) and SnO2(+CuO) were patterned by metal shadow mask for simple fabrication process on the silicon substrate. The micro gas sensors with SnO2(+Pt) and SnO2(CuO) showed good selectivity to CO gas among reducing gases and good sensitivity to H2S that is main component of bad odor, separately.

Smart Thermostat based on Machine Learning and Rule Engine

  • Tran, Quoc Bao Huy;Chung, Sun-Tae
    • Journal of Korea Multimedia Society
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    • v.23 no.2
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    • pp.155-165
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    • 2020
  • In this paper, we propose a smart thermostat temperature set-point control method based on machine learning and rule engine, which controls thermostat's temperature set-point so that it can achieve energy savings as much as possible without sacrifice of occupants' comfort while users' preference usage pattern is respected. First, the proposed method periodically mines data about how user likes for heating (winter)/cooling (summer) his or her home by learning his or her usage pattern of setting temperature set-point of the thermostat during the past several weeks. Then, from this learning, the proposed method establishes a weekly schedule about temperature setting. Next, by referring to thermal comfort chart by ASHRAE, it makes rules about how to adjust temperature set-points as much as low (winter) or high (summer) while the newly adjusted temperature set-point satisfies thermal comfort zone for predicted humidity. In order to make rules work on time or events, we adopt rule engine so that it can achieve energy savings properly without sacrifice of occupants' comfort. Through experiments, it is shown that the proposed smart thermostat temperature set-point control method can achieve better energy savings while keeping human comfort compared to other conventional thermostat.

The study of the calculation of energy consumption load for heating and cooling in building using the Laplace Transform solution

  • Han, Kyu-Il
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.50 no.3
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    • pp.292-300
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    • 2014
  • The Laplace Transform solution is used as a mathematical model to analyse the thermal performance of the building constructed using different wall materials. The solution obtained from Laplace Transform is an analytical solution of an one dimensional, linear, partial differential equation for wall temperature profiles and room air temperatures. The main purpose of the study is showing the detail of obtaining solution process of the Laplace Transform. This study is conducted using weather data from two different locations in Korea: Seoul, Busan for both winter and summer conditions. A comparison is made for the cases of an on-off controller and a proportional controller. The weather data are processed to yield hourly average monthly values. Energy consumption load is well calculated from the solution. The result shows that there is an effect of mass on the thermal performance of heavily constructed house in mild weather conditions such as Busan. Building using proportional control experience a higher comfort level in a comparison of building using on-off control.

Essential oil impregnation into graphene sponges with electric desorption control

  • Mendez, Jose Antonio Cabello;Bueno, Jose de Jesus Perez;Valencia, Jorge Ivan Mendoza;Soto, Jonathan Soto;Lopez, Maria Luisa Mendoza;Guerrero, Mizraim Uriel Flores
    • Advances in nano research
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    • v.12 no.6
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    • pp.629-638
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    • 2022
  • This work shows the impregnation of scents using a graphene sponge (GS). This was functionalized by the modified Hummers method, pursuing to add different functional groups. It is proposed to achieve the release and seek to control it through electrical potential applied to the graphene sponge with essential oils. The graphene sponge was functionalized and steeped with two kinds of oil. The electrochemical study demonstrates the variation in the electrochemical behaviour of the functionalized graphene sponge without and impregnated with oil. The release of the oil and its aromatic scents was carried out by applying an electrical potential of 30 V, with a release rate of 1.86 mg/min. The heating of the sample that causes the release of oil, associated with the electrical resistance of the system, reaches temperatures of about 150℃. The essential oils, graphene sponge, surfactant, graphene sponge with essential oils, graphene sponge recuperated after applying electric potential, graphene sponge recovered by temperature and dipropylene glycol (DPG) were characterized using Fourier transformed infrared spectroscopy (FTIR), digital microscopy, and x-ray photoelectron spectroscopy (XPS).

A Study on Pill Temperature Control method and Hydrogen Production with 2-step Thermochemical Cycle Using Dish Type Solar Thermal System (접시형 태양열 시스템을 이용한 2단계 열화학 싸이클의 수소 생산과 PID 온도 제어 기법 연구)

  • Kim, Chul-Sook;Kim, Dong-Yeon;Cho, Ji-Hyun;Seo, Tae-Beom
    • Journal of the Korean Solar Energy Society
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    • v.33 no.3
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    • pp.42-50
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    • 2013
  • Solar thermal reactor was studied for hydrogen production with a two step thermochemical cycle including T-R(Thermal Reduction) step and W-D(Water Decomposition) step. NiFe2O4 and Fe3O4 supported by monoclinic ZrO2 were used as a catalyst device and Ni powder was used for decreasing the T-R step reaction temperature. Maintaining a temperature level of about 1100C and 1400C, for 2-step thermochemical reaction, is important for obtaining maximum performance of hydrogen production. The controller was designed for adjusting high temperature solar thermal energy heating the foam-device coated with nickel- ferrite powder. A Pill temperature control system was designed based on 2-step thermochemical reaction experiment data(measured concentrated solar radiation and the temperature of foam device during experiment). The cycle repeated 5 times, ferrite conversion rate are 4.49~29.97% and hydrogen production rate is 0.19~1.54mmol/g-ferrite. A temperature controller was designed for increasing the number of reaction cycles related with the amount of produced hydrogen.

Field Survey of Greenhouse for Strawberry Culture -Case Study Based on Western Gyeongnam Area- (딸기재배 온실의 현장조사 분석 -서부경남 지역을 중심으로-)

  • Jeong, Young Kyun;Lee, Jong Goo;Yun, Sung Wook;Kim, Hyeon Tae;Yoon, Yong Cheol
    • Journal of Bio-Environment Control
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    • v.27 no.3
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    • pp.253-259
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    • 2018
  • This study set out to select a system to realize an optimal environment for strawberry cultivation greenhouses based on data about the growth and development of strawberry and its environment and to provide basic data for the research of its improved productivity. For these purposes, the investigator conducted a field survey with greenhouses for strawberry cultivation in western Gyeongnam. The findings show that farmers in their fifties and sixties accounted for the biggest part in the age groups of strawberry farmers. While those who were under 50 were accounted for approximately 67.5%, those who were 60 or older accounted for 32.5%. As for cultivation experiences, the majority of the farmers had ten years of cultivation experiences or less with some having 30 years of cultivation experiences or more. All the farmers built an arch type single span greenhouse. Those who used nutrient solutions were about 75.0%, being more than those who used soil. All of the farmers that used a nutrient solution adopted an elevated hydroponic system. The single span greenhouses were in the range of 7.5~8.5m, 1.3~1.8m and 2.5~3.5m for width, eaves, and ridge height, respectively, regardless of survey areas. The rafters interval was about 0.7~0.8m. In elevated hydroponic cultivation, the width, height, and interval of the beds were about 0.25m, 1.2m and 1.0m, respectively. As for the strawberry varieties, the domestic ones accounted for approximately 97.5% with Seolhyang being the most favorite one at about 65.0%. As for the internal environment factors of greenhouses, 38 farmers measured only temperature and relatively humidity. As for hydroponics, the farmers used a hydroponics control system. Except for the farmers that introduced a smart farm system for temperature and humidity control, approximately 85.0% controlled temperature and humidity only with a control panel for side windows and ventilation fans. As for heating and heat insulation, all of the farmers were using water curtains with many farmers using an oil or electric boiler, radiating lamp or non-woven fabric, as well, when necessary.

A IoT simulation programs utilizing the Swing components (Swing 컴포넌트를 활용한 IoT 시스템 시뮬레이션 프로그램)

  • Hwang, Jong-sun;Lim, Hyeok;Jang, Jae-Myung;Kim, Han-Gyung;Jung, Hoe-Kyung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.10a
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    • pp.666-668
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    • 2015
  • Recent domestic IoT (Internet Of Things) technologies and research is being actively conducted, it actually provides power control, heating control such services in the home or office. Depending on the interest of the IoT so as to provide convenient services to users also increased their users are increasingly questioning or wondering about the operation of IoT system. The system representing an easy to understand the operation of the IoT system is required in order to meet the requirements of those users. For this purpose this paper, Swing utilization by user, sensor, SNS (Social Network Service) when an event occurs, such as the relationship between devices bearing the collaboration process can be monitored with a simulation program was designed and implemented.

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