• Title/Summary/Keyword: suggested temperature

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Fabrication and Characterization of High Temperature Electrostatic Chucks

  • Bang, Jae-Cheol
    • The Korean Journal of Ceramics
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    • v.5 no.1
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    • pp.87-90
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    • 1999
  • It was suggested that tape casting method can be used to fabricate high-temperature electrostatic chucks(HTESC) based on a metal substrate coated with a glass-ceramic insulating layer. The adhesion of the coating was excellent such that it was able to withstand temperature cycling to over $300^{\circ}C$ without spalling. The electrostatic clamping pressure reached a very high value of about 9 torr at 600V and generally followed the theoretical voltage-squared curve. Based on these results, we believe that we successfully developed a viable technique for manufacturing low cost HTESC.

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Over-Temperature Protection Circuit Modeling Using MOSFET Rds(on) Temperature-Resistance Characteristics (MOSFET Rds(on) 온도-저항 특성을 이용한 과열보호회로 모델링)

  • Choi, Nak-Gwon;Lee, Sang-Hoon;Kim, Hyoung-Woo;Kim, Ki-Hyun;Seo, Kil-Soo;Kim, Nam-Kyun
    • Proceedings of the KIEE Conference
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    • 2005.07d
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    • pp.3019-3021
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    • 2005
  • In this paper we suggest a novel temperature detection method utilized in direct over-temperature protection circuit modeling. The suggested model detects temperature variation using Rds(on) characteristics of MOSFET, while the conventional methods are using extra devices such as a temperature sensor or an over-temperature detection transistor. The temperature-dependant MOSFET model is implemented using Spice ABM(Spice Analog Behavior Model). The direct over-temperature protection circuit was designed including it. We verified effectiveness of the temperature dependant Rds(on) model characteristics and performance of the direct over-temperature protection circuit on PSpice simulation

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Estimation Model of the Change in Dairy Leaf Surface Temperature Using Scaling Technique

  • Eom, Ki-Cheol;Eom, Ho-Yong
    • Korean Journal of Soil Science and Fertilizer
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    • v.46 no.5
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    • pp.359-364
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    • 2013
  • This study was conducted to develop a model to estimate crop leaf surface temperature. The results were as following; A definition for the daily time based on elapsed time from the midnight (00:00) as "E&E time" with the unit of Kmin. was suggested. The model to estimate the scaled temperature ($T^*e$) of crop leaf surface temperature by scale factor ($T^*$) according to the "E&E time : Kmin."(X) was developed as eq. (1) $T^*e=0.5{\cdot}sin(X+780)+0.5$ (2) $T^*=(Tx-Tn)/(Tm-Tn)$, Tx : Daily leaf temperature, Tm : Daily maximum leaf temperature, Tn : Daily minimum leaf temperature. Relative sensitivity of the measured temperature compared to the estimated temperature of red pepper, soybean and persimmon was 1.078, 1.033 and 0.973, respectively.

A Study of BioSignal Analysis for Physical Activity of Wu-Shu Training (우슈 수련자의 신체활동에 따른 생체신호 분석에 관한 연구)

  • Kim Chang-Mo
    • The Journal of the Korea Contents Association
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    • v.5 no.6
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    • pp.230-237
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    • 2005
  • In this paper, we are suggested a method that's a major topics in sports medicine. It is disease control, control and management of chronic degenerative disease, and promotion of health. We are analyze physical activity to scientific and quantitative a trainee at Wu-Shu gymnasium, for a suggested method. We are measured a quantity of physical activity by SenseWear-PRO2-Armband which develop body-media company. Armband include to skin temperature sensor, near-body temperature sensor, accelerometer, heat flux sensor, galvanic skin response sensor. Acquired data was recorded to storage in Armband. We are analyzed using InnerView Wearer Software in the Stored data to skin temperature, calorie expenditure, quantity of physical activity. The result of this analyzed, we are know that a man of long-term exercise expenditure energy at short time and if liveliness of physical activity was Increase in expenditure energy with increase skin temperature. Also, we are know that the heat flux after increase expenditure energy with increase skin temperature. And, know that GSR was not affected a factors that physical activity, expenditure energy, increase skin temperature, and others.

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Seasonal Variation of Fish Catch Using a Fence Net in the Shallow Tidal Flat off Ganghwado, Korea (강화도 갯벌 천해의 건간망 어획 어류의 계절 변동)

  • HWANG Sun Wan;KIM Chong Kwan;LEE Tae Won
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.36 no.6
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    • pp.676-685
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    • 2003
  • Seasonal variation of the fishery resource in the shallow waters of Ganghwado tidal flat was investigated using monthly collected samples with a fence net from June 1998 to May 1999. Thirty-six species were found including 27 fish species, 6 crustaceans, and 3 molluscs. Of the fish, Konosirus punctatus, Sardinella zunasi Liza haematocheila and Synechogobius hasta dominated in the number of individuals $(92.1\%)$ and in biomass $(94.5\%).$ A few number of resident species, such as L. haematocheila and S. hasta, were collected only during the cold months. As the water temperature increased in the spring, the adult migratory fish such as K. punctatus and S. zunasi, were collected. In the summer, the juvenile fish recruited in the shallow water showing a peak in fish abundance. The data suggested that they grew until late autumn before moving to deeper waters for over-wintering. The principal component analysis showed that the seasonal variation in species composition was principally determined by water temperature and/or water temperature related factors. The species composition of the fish assemblage in the study area suggested that these species are highly adapted to extreme seasonal temperature variation and high water turbidity.

Thermal stress of concrete structure at high temperature considering inelastic thermal strain change (고온에서의 비선형 변형도를 고려한 콘크리트 구조물에서의 열응력 분포)

  • 강석원;홍성걸;신영수
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10b
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    • pp.1145-1150
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    • 2000
  • Concrete behaves as ductile material at high temperature. The existing stress-strain relationship is not valid at high temperature condition. Thus, stress-strain curve of concrete at high temperature is re-established by modifying Saenz's suggestion in this study. A constitutive model of concrete subjected to elevated temperature is also suggested. The model consists of three components; free thermal stain, mechanical strain and thermal creep strain. As the temperature increase, the thermal creep becomes more critical to the failure of concrete. The thermal creep strain of concrete is derived from the modified power-law relation for the steady state creep. The proposed equation for thermal creep employs a Dorn's temperature compensated time theorem

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Optimal Control Strategies for Energy Saving of Central Cooling System with Outdoor Air Temperature Changes (외기온도 변화특성을 고려한 중앙냉방시스템의 에너지 절감 최적제어에 관한 연구)

  • Park, Ki-Tae;Ahn, Byung-Cheon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.6
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    • pp.4260-4266
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    • 2015
  • In this study, the optimal control method for minimizing of energy consumption for central cooling system with proper occupant comfort level is researched by simulation. The optimal control method is that the optimal set temperatures such as the condenser water temperature, supply air temperature, and chilled water temperature with environment variable change such as outdoor air dry-bulb and wet-bulb temperatures are obtained by suggested optimal control algorithm with maximum and part building load. The TRNSYS program is used for system modeling and the control performances with the suggested optimal control method are compared with the existing control method of fixed set points. The suggested optimal control method shows better responses in energy consumption in comparison with existing control ones.

A Study of Rewetting Temperature in Cooling of Hot Surfaces (高溫表面의 冷却時 再水着 溫度 에 관한 硏究)

  • 정문기;이영환;박종석
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.9 no.4
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    • pp.463-470
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    • 1985
  • In this study a parametric analysis for the rewetting temperature was made with 572 data obtained from the single tube experiment. The rewetting temperature was also evaluated by measuring the vaporization time of a liquid drop on a hot surface at the elevated pressures. The results showed that the rewetting temperature increased with flooding rate, inlet subcooling pressure and initial wall temperature, and decreased with increasing axial elevation. Based on the results obtained, the rewetting temperature correlation was suggested. From the comparison of correlated rewetting temperatures with measured values, it showed that the correlated values fell within .+-.5% error from the measured values.

Study on Matter Production and Phothsynthetic Characteristics in Wild Vegetable(Chwinamul) (취나물류의 물질생산과 광합성특성에 관한 연구 II. 수분스트레스하에서 고온 및 저온처리가 취나물류의 광합성속도에 미치는 영향)

  • 조동하
    • Korean Journal of Plant Resources
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    • v.11 no.3
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    • pp.307-314
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    • 1998
  • The response of water stree under high and low temperatures, was shown differently according to the longer the suspension period of water supply. Leaf photosynthetic rate(LPS), leaf water potential(WP), relative leaf water content and relative soil water content were lower. At the higher temperatures, the percentate of reduction in LPS and WP was greater than at low temperatures. It is suggested that evaporation rate should be higher in the high temperature than the lower temperature. Also leaf water potential was lower at high temperature than at low temperature. After the 9 th day of treatment , LSP was remarkably reduced at high temperature, but the reduction of LPS was not significant at low temperature. Solidago virga-aurea var. asiatic that maintained LPS of 3rd day after treatment was more strong than other varieties at low temperatures. The silting and curling of leaves were observed symptoms of stress on the 9th day at the both temperatures. The leaves of aster scaber and Ligularia fischeri turned red on the 9th day after treatment at low temperature.

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Tissue Mimicking Phantom for Visualization of Temperature Elevation Caused by Ultrasound (초음파에 의한 온도상승 가시화용 생체 모의매질)

  • Jung, Ji-Hee;Kim, Jung-Soon;Ha, Kang-Lyeol;Kim, Moo-Joon;Cao, Yonggang
    • The Journal of the Acoustical Society of Korea
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    • v.33 no.5
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    • pp.291-299
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    • 2014
  • To probe the temperature elevation effect caused by ultrasound, a tissue mimicking phantom was newly suggested. A carrageenan gel was adopted to realize not only the required transparency for visualization but also acoustic characteristics similar to human tissue. To visualize the temperature elevation inside phantom, thermochromic film with a critical temperature of discoloration was introduced. Acoustic characteristics of the tissue mimicking phantom were examined when the concentrations of carrageenan and sucrose changed. As the results, the attenuation coefficient of the phantom could be controlled in the range of 0.44~0.49 dB/cm/MHz, and the acoustic impedance in the range of 1.52~1.77 Mrayls. We could control the acoustic characteristics of the phantom by different concentration of carrageenan and sucrose, and it was possible to examine the temperature elevation caused by ultrasound in the phantom. The suggested method was verified by noninvasively visualizing the temperature elevation due to planar and focused ultrasound using the fabricated phantom.