• Title/Summary/Keyword: 습의

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Hygroscopic characteristics and changes of quality attributes for composite seasoning with relative humidity (복합조미료의 상대습도에 따른 흡습특성 및 품질변화)

  • Kim, Hyun-Ku;Jo, Kil-Suk;Moon, Kwang-Deog;Park, Mu-Hyun
    • Applied Biological Chemistry
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    • v.35 no.3
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    • pp.186-190
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    • 1992
  • Composite seasoning was stored at the temperature of $40^{\circ}C$ and $50^{\circ}C$, the relative humidity of 11, 32, 57, 65, 75 and 95% without any packaging. The moisture content reached to equilibrium state within short period below 57% RH, but it increased rapidly above 65% RH. The hygroscopic characteristics of compoposite seasoning was similar to each temperature and the amount of absorbed water was decreased at the higher temperature. The optical density due to browning development was increased above 57% RH during storage. L and b value of composite seasoning was decreased according to the increase of temperature and relative humidity. Palatibility of color, taste and flavor, and caking of composite seasoning was sharply decreased above 57% RH during storage.

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An Experimental Study on Frosting of Humid Air-flow on a Surface with Local Cooling for Heat Exchanger Design (열교환기 설계를 위한 국소 냉각 표면위에서의 습공기 유동의 착상실험)

  • Kwon, Jeong-Tae;Lim, Hyo-Jae;Park, Kyoung-Woo;Kim, Chang-Eob;Kim, Kyung-Min;Kwon, Young-Chul
    • Journal of Energy Engineering
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    • v.17 no.1
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    • pp.1-7
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    • 2008
  • The present study has been conducted to understand the heat and mass transfer characteristics of humid airflow in frosting conditions. A flat plate of aluminum was used for the simulation of flat surface part of the fin of the heat exchanger. The aluminum surface temperatures were measured and analyzed to clarify the heat and mass transfer characteristics under frosting conditions. Also, the pressure drops were measured to clarify the air-blocking effect of frost in the mini channel of the air-side hoot exchangers. A data reduction method was developed far the analysis of local characteristics of humid air under frosting conditions.

Smart Plants Management System based on Internet (인터넷 기반 스마트 화초 관리 시스템)

  • Park, Hyunsook;Park, Chun-Kwan;Hong, You-Sik
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.15 no.5
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    • pp.193-199
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    • 2015
  • Recently the artificial intelligence green house system, which collects automatically the informations of plants cultivation circumstances and controls the growing circumstances, is studied using temperature, humidity and illuminance sensors. In this paper, the inference for plants cultivation of optimum circumstance conditions is simulated on the internet bases by predicting the temperature, humidity and illuminance. On the IOT circumstances, the plant cultivation conditions of temperature, humidity and illuminance, using Arduino sensor, are transmitted to the manager on realtime and if the optimum condition of temperature and humidity for plant cultivation is not equal to the values, the system transmits automatically the SMS warning messages on realtime. Although the sudden climite conditions(snow, rain, hot weather) are occurred, the optimum condition of plant cultivation can be controlled. In this paper, using Fuzzy rules and WEKA TOOL, although the same flora temperature zone is used, the simulation is produced for the optimum value of temperature, humidity and illuminance for the zone.

Effect of Humidity and Flooding on the Performance of Proton Exchange Membrane Fuel Cell (고분자전해질 연료전지의 성능에 미치는 습도와 플러딩의 영향)

  • Hwang, Byungchan;Chung, Hoi-Bum;Song, Myung-Hyun;Oh, Sung-June;Na, Il-Chai;Park, Kwonpil
    • Korean Chemical Engineering Research
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    • v.55 no.3
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    • pp.302-306
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    • 2017
  • Humidity affect performance and durability of proton exchange membrane fuel cell (PEMFC). High humidity of gases generally enhance the performance, but high humidity have the danger of flooding. I-V performance, linear sweep voltammetry, cyclo voltammetry, and impedance of micro-channel cell measured with change of relative humidity (RH). Flooding phenomena started at RH 70%. Ion conductivity of membrane reached maximum value at RH 80%. Maximum current density of $1,700mA/cm^2$ (at 0.6 V) was obtained at RH 80%. Therefore the effect of ion conductivity increasement was higher than that of mass transfer decrease by flooding at RH 80%.

Changes of quality in Pleurotus ostreatus during low-temperature storage as affected by cultivation temperature and relative humidity (느타리의 생육 온습도 및 저장기간에 따른 품질변화)

  • Lee, Yun-Hae;Lee, Han-Bum;Ju, Young-Cheoul
    • Journal of Mushroom
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    • v.9 no.1
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    • pp.34-38
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    • 2011
  • In this study, temperature and relative humidity during growth of fruit body were applied to oyster mushroom (Pleurotus ostrestus) to elucidate the prolongation effect of storage. Although there were not big differences among conditions of cultivation, weight loss and change of pileus color were slight increased and hardness and springness of fruit body were little decreased with storage period. When whole mushrooms (250~300g) were packaged with wrap and stored at $4{\pm}1^{\circ}C$, the shelf life of the oyster mushrooms were cultivated at $16^{\circ}C$ and at $13^{\circ}C$ was 18 day and 24days, respectively. Therefore, it was elucidated that the treatment of low-temperature at the step of fruit body development affected extension of shelf life in oyster mushroom.

Multi-physics Modelling of Moisture Related Shrinkage in Concrete (콘크리트 수분관련 수축에 관한 다중물리모델)

  • Lee, Chang-Soo;Park, Jong-Hyok
    • Journal of the Korean Society of Hazard Mitigation
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    • v.9 no.2
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    • pp.1-9
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    • 2009
  • Water binder ratio combine high-performance concrete shrinkage of less than 0.4 to determine the transformation to a total shrinkage of water to move outside and internal consumption of moisture due to drying shrinkage and autogenous shrinkage, and then, the relative humidity changes and strain to be approached by surface physics describe the relationship between self-desiccation and autogenous shrinkage was set. To verify the self-desiccation in the humidity shrinkage and humidity measurements performed, and the research model, Tazawa, CEB-FIP model than to let the measure and the most similar results in this study based on self-desiccation model, autogenous shrinkage didn't represent the linear shrinkage by the drying shrinkage of the external moving but exponential relationships, unlike with the nature and rapid in the early age properly describes the attributes in shrinkage could see. After this research to move moisture and to reflect the shrinkage model, temperature, moisture transfer, strain analysis by multi-physics model is very similar to the results of mock-up specimen measurements performed for this research, the value measured by the internal consumption of moisture, therefore self-desiccation and a multi-physics model considering autogenous shrinkage might be relevant.

Influence of Radioactive Contamination to Agricultural Products Due to Dry and Wet Deposition Processes During a Nuclear Emergency (원자력 사고 중 핵종의 건. 습침적에 따른 농작물 오염 영향)

  • Hwang, Won-Tae;Kim, Eun-Han;Suh, Kyung-Suk;Han, Moon-Hee;Choi, Pong-Ho;Lee, Chang-Woo
    • Journal of Radiation Protection and Research
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    • v.27 no.3
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    • pp.165-170
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    • 2002
  • Combined with deposition model onto the ground of radionuclides, the influence of radioactive contamination to agricultural products was analyzed due to wet deposition as well as dry deposition from radioactive air concentration during a nuclear emergency. The previous dynamic food chain model, in which initial input parameter is only radionuclide concentrations on the ground, was improved for the evaluating of radioactive contamination to agricultural products from either radionuclide concentrations in air or radionuclide concentrations on the ground. As the results, in case of deposition onto the ground, wet deposition was more dominant process than thy deposition. While the contamination levels of agricultural products were dependent on the a variety of factors such as radionuclides and rainfall rate. It means that the contamination levels of agricultural products are determined from which is more dominant process between deposition on the ground and interception onto agricultural plants.