• Title/Summary/Keyword: Heat and Cold

Search Result 1,965, Processing Time 0.029 seconds

A Research on the Deliria speech of "Sanghanmyeonglisoglon(傷寒明理續論)" ("상한명리속론(傷寒明理續論)" 중 섬어외 8증(證)에 대한 연구(硏究))

  • Choi, Dong-Su;Sheen, Yeong-Il
    • Journal of Korean Medical classics
    • /
    • v.19 no.4
    • /
    • pp.241-256
    • /
    • 2006
  • Aversion to wind is a feeling of cold when exposed to wind; aversion to cold is a feeling of cold. The distinction between aversion to wind and aversion to cold is ambiguous because in greater yang disease the two terms seem to be used indiscriminately. It is, however, worth noting that "aversion to wind" does not occur in the lines presenting disease of the three yin. In this text, we render as "heat effusion" rather than "fever," since the Chinese term is somewhat wider in meaning than familiar English term, Heat effusion is associated with many conditions and occurs both in externally contracted disease and miscellaneous disease (雜病), disease due to causes other than external evils). In externally contracted disease of the three yang channels, heat effusion is a manifestation of the struggle between right qi and evil qi; it does not necessarily indicate the presence of evil heat. In diseases of the three yin, right qi is not strong enough to counter evil qi; hence heat effusion is absent, and instead only aversion to cold is present. Sweating occurs in a variety of patterns. A distinction is made between spontaneous and night sweating(自汗). Spontaneous sweating is so called because it occurs spontaneously without exertion. it has numerous causes. Night sweating(盜汗) is sweating during sleep that ceases on awakening.

  • PDF

Computer Simulation Study of the Thermoelectric Cooling by Hybrid Method (하이브리드법을 이용한 열전냉각의 수치해석 연구)

  • Kim, N.J.;Lee, J.Y.;Kim, C.B.
    • Solar Energy
    • /
    • v.20 no.1
    • /
    • pp.97-108
    • /
    • 2000
  • The purpose of this study is to minimize the heat transfer surface area and cold fluid exit temperature of heat exchanger which applied to the refrigeration and air-conditioning system by utilizing the thermoelectric principle. Both uniform and non-uniform current distribution methods which applied to the analysis of the TE elements that incorporates heat exchanger were investigated. The non-uniform current distribution method had the better coefficient of performance and had the lower cold fluid exit temperature of the TE cooling system than the uniform current distribution method. It was found that if a TE cooling system incorporates a heat exchanger, a non-uniform current distribution should guarantee to the lowest cold fluid exit temperature. Also, the hybrid method (combination of the uniform and non-uniform current distribution method) is investigated to achieve the best results by combining the uniform and non-uniform current distributions. The results show that it can lower the cold fluid exit temperature and reduce the heat transfer surface area for the parallel flow arrangement if we apply the constant current in some entry region and the non-uniform increasing current in the direction of the cold fluid flow afterwards.

  • PDF

Value Engineering Approach for Heat Curing Method Under Cold Weather Condition (한중콘크리트 보온양생 공법에 대한 VE분석)

  • Woo, Dae-Hun;Kim, Tae-Cheong;Kim, Jong;Jeon, Chung-Keun;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2010.05a
    • /
    • pp.21-23
    • /
    • 2010
  • This study was conducted to draw various decisive elements of a reasonable heat curing method and to examine the importance in deciding a construction method when constructing cold weather concrete. As a result, the items proposed as important elements at the time of decision of a heat curing method included economy, workability, maintainability, insulation capability, reduced construction period and usability. As a result of importance by items under AHP technique, it was found the most important element was insulation capability, followed by reduced construction period and workability. As a result of comparison of a heat supplying and a heat insulation method by dual bubble sheet differed 2 times as much as a heat supplying method, especially the evaluation degree by insulation capability and reduced construction period was high.

  • PDF

A Study on the Correlation between the Cold-damage Six-meridian disease of Qibo (岐伯六經病證) and the Sasang Constitutional Symptomatology (四象體質病證) (기백육경병증(岐伯六經病證)과 사상체질병증(四象體質病證)간의 상관관계 연구)

  • Lee, Jun-Hee
    • Journal of Sasang Constitutional Medicine
    • /
    • v.33 no.1
    • /
    • pp.1-21
    • /
    • 2021
  • Objective The purpose of this study was to examine the correlation between the Cold-damage Six-meridian disease of Qibo (岐伯六經病證) and Sasang Constitutional Symptomatology (四象體質病證), presented in Discourse on the Origin of Eastern Medicine (醫源論) of Longevity and Life Preservation in Eastern Medicine (Donguisusebowon, 東醫壽世保元). Method The process of development from Cold-damage Six-meridian disease of Qibo (岐伯六經病證) to Six Meridians Physical Symptoms and Medicines (六經形證用藥) in the chapter Cold(寒門) of the Treasure Mirror of Eastern Medicine (Donguibogam, 東醫寶鑑) was investigated. And the correlation between Six Meridians Physical Symptoms and Medicines (六經形證用藥) and Sasang Constitutional Symptomatology (四象體質病證) was considered. Results and Conclusions 1. The Cold-damage Six-meridian disease of Qibo (岐伯六經病證) in the chapter Heat Treatise (熱論篇) of Basic Questions (素問) had evolved into Six Meridians Physical Symptoms and Medicines (六經形證用藥) in the chapter Cold(寒門) of the Treasure Mirror of Eastern Medicine (Donguibogam, 東醫寶鑑) through Book for Life Saving (Huorenshu, 活人書), a work of Zhu Gong (朱肱), Six Books on Cold Damage disease (Shanghanliushu, 傷寒六書), a work of Tao Hua (陶華) and Introduction to Medicine (YixueRumen, 醫學入門), a work of Li Chan (李梴). 2. The correlation between the Cold-damage Six-meridian disease of Qibo (岐伯六經病證) and Sasang Constitutional Symptomatology (四象體質病證) can be analyzed and understood through Six Meridians Physical Symptoms and Medicines (六經形證用藥) in the chapter Cold(寒門) of the Treasure Mirror of Eastern Medicine (Donguibogam, 東醫寶鑑). 3. Greater Yang meridian disease of Qibo (岐伯) is related to Soyangin early stage of Lesser-Yang Wind-Injury symptomatology and Soyangin early stage of Chest-Heat symptomatology, Yang Brightness meridian disease and Greater Yin meridian disease to Taeeumin Liver-Heat symptomatology, Lesser Yin meridian disease to Soyangin Chest-Heat symptomatology, Lesser Yang meridian disease to Soyangin early stage of Lesser-Yang Wind-Injury symptomatology and Reverting Yin meridian disease to Soeumin Reverting Yin symptomatology of Greater Yang disease.

The Study on Cooling Characterics of TMA Clathrate with Ethanol (에탄올을 첨가한 TMA 포접화합물의 냉각특성에 대한 연구)

  • 김창오;김진흥;정낙규;김석현
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.14 no.8
    • /
    • pp.634-640
    • /
    • 2002
  • The purpose of this study is to investigate the propriety of TMA clathrate as a cold storage medium. Particularly, this is to examine the extent of subcooling improvement when the additives is added to the TMA clathrate, because water used for cold storage ma terial has low phase change temperature and subcooling. This study has been analyzed and compared pure water with TMA 30 wt% clathrate how phase change temperature, subcooling and specific heat in the various concentrations are changed. This results prove low phase change temperature and subcooling control effect when the ethanol is added to the TMA 30 wt% clathrate than the TMA 30 wt% clathrate. In addition, it results low specific heat when there is added to the TMA 30 wt% clathrate over 0.5 wt% ethanol in the cold heat source temperature under $-7^{\circ}C$. The other side, it results high specific heat when the ethanol is added in it at the cold heat source temperature under $-5^{\circ}C$. Therefore, it is found that the additive must be controlled by available solution limit and study for new additive must be lasted to know its effect.

An Experimental Study on Thermal Properties of Clathrate for Cold Storage Applications (저온축열용 포접화합물의 열물성에 관한 실험적 연구)

  • 한영옥;정낙규;김진흥
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.12 no.8
    • /
    • pp.725-734
    • /
    • 2000
  • The objective of this paper is to investigate the thermal properties of TMA clathrate applicable to cold storage system for building air-conditioning. Especially, the test tube experiments are peformed by comparing and analyzing the temperature of phase change, specific heat and subcooling characteristic according to the variation of concentrations and temperature of heat source in TMA clathrate. The results are summarized as follows; 1) temperature of phase change is dropped as the temperature of heat source is lower, 2) the effect of subcooling suppression with about $9.3^{\circ}C$ is confirmed when the temperature of heat source is $-10^{\circ}C$ in case of 30wt%, while the temperature of subcooling is about $0^{\circ}C$ when the temperature of heat source is $-15^{\circ}C$ in case of 25, 29wt% and 30wt% . Thus, the effect of subcooling suppression is greater as the temperature of heat source is lower. Additionally, the concentrative study is needed on mass concentration causing the phase change without subcooling phenomenon when the temperature of heat source is $-15^{\circ}C$ Thus, it is concluded that TMA clathrate has proper properties as the cold storage medium for building air-conditioning.

  • PDF

Changes of Surface Temperature and Electromyography Activities by Local Heat and Cold (온열과 냉의 국소적용에 의한 체표면 온도와 근전도 활동의 변화)

  • Choi, Seok-Ju;Lim, Sang-Wan;Kim, Su-Hyon;Mun, Dal-Ju
    • Journal of the Korean Academy of Clinical Electrophysiology
    • /
    • v.5 no.2
    • /
    • pp.61-72
    • /
    • 2007
  • INTRODUCTION: Local heat and cold application has been frequently used as means of muscle relaxation and blood circulation or reinforcing muscle strength, relaxing muscle tension in clinical situation. In particular, it has been known that long-term heat and cold application for relaxing muscle tension inhibits muscle spasticity or tension. But, it has been rarely reported that what influences of heat and cold application on activation of muscle action potential. Therefore, this study aims to analyze surface temperature and electromyography activities according to the heat and cold application. METHODE: Subjects of this research were 10 normal men and women (5 men, 5 women). Hot pack and cold pack was applied to vastus medialis muscle of thigh and rectus femoris muscle for 20 min. Surface temperature of vastus medialis muscle and rectus femoris muscle was measured, knee joint of subjects was in $45^{\circ}$ flexion, sitting on a chair, maximal isometric contraction was induced, surface electromyography (sEMG) signals were collected and root mean square (RMS) and median frequency (MOF) were analyzed. All measurements were conducted before and immediately after experiment, 10 min., 20 min. and 30 min. after experiment. Data were analyzed with SPSS 12.0 program, comparison of changes in superficial temperature and sEMG signals through repeated measurement was conducted with repeated measures ANOVA and significance level $\alpha$ was 0.05. RESULTS: Changes of surface temperature of vastus medialis muscle according to cold application were radically decreased immediately after application, but it was recovered after 30 min. of application and it showed significant difference (F4. 36=72.216, P<0.001). Surface temperature of rectus femoris also showed radical decrease immediately after application, but it was recovered after 30 min. of application and showed significant difference (F4. 36=88.930, P<0.001). Changes of surface temperature of vastus medialis muscle according to heat application were radically increased immediately after application, but it was recovered after 30 min. of application and it showed significant difference (F4. 36=27.267, P<0.001). Surface temperature of rectus femoris also showed radical decrease immediately after application, but it was recovered after 30 min. of application and showed significant difference (F4. 36=19.774, P<0.001). Changes of sEMG by heat and cold application were no statistical difference. Surface temperature of skeletal muscle after heat and cold application showed significant change for 30 min., but it was found that increase or decrease of surface temperature had not great influence on sEMG activities.

  • PDF

A Study on the Pathogenic Factors and Treatments of Exogenous Febrile Disease with Time (외감열병(外感熱病)의 원인(原因)과 치법(治法)에 대한 통시적(通時的) 고찰(考察))

  • Yang, Kwang-Yeol
    • Journal of Korean Medical classics
    • /
    • v.21 no.1
    • /
    • pp.295-302
    • /
    • 2008
  • Until the middle of the 20th century, exogenous febrile disease was the most common disease that threatened the human health. For a long time, oriental medicine doctors developed many ways to cure this disease by studying pathogenic factors. The phthogenic factors and treatments of exogenous febrile disease with time are as followings. "Naegyeong(內經)" : Cold pathogen. Diaphoretic therapy, purgation therapy. Hwata : Cold pathogen. Diaphoretic therapy, emetic therapy, purgation therapy. Jangjunggyeong(張仲景) : Cold pathogen. Eight principal therapeutic methods except diaphoretic therapy with pungent and cool properties. Yuhagan(劉河間) : Fire pathogen. Diaphoretic therapy with pungent and cool properties. Idongwon(李東垣) : Improper diet and overstrain. Reinforcing therapy. Ouga(吳又可) : Epidemic pathogenic factors. Diaphoretic therapy with pungent and cool properties, Heat-reducing therapy. purgation therapy Seopcheonsa(葉天士) : Warm pathogen. diaphoretic therapy, Heat-reducing therapy, expel Heat therapy, cooling the blood and eliminating stagnation of blood. Oguktong(吳鞠通) : Six pathogenic factors. Eight principal therapeutic methods including diaphoretic therapy with pungent and cool properties.

  • PDF

Cold Rolling and Heat Treatment Characteristics of TiNi Based Shape Memory Wire (TiNi계 형상기억합금 선재의 냉간압연 및 열처리 특성)

  • Kim, R.H.;Kim, H.S.;Jang, W.Y.
    • Journal of the Korean Society for Heat Treatment
    • /
    • v.30 no.6
    • /
    • pp.251-257
    • /
    • 2017
  • The effect of annealing temperature on the martensitic transformation behavior, tensile deformation chracteristics and shape recovery etc., has been studied in TiNi based shape memory ribbon fabricated by coldrolling of wire. TiNi based shape memory wire (${\phi}=500{\mu}m$) of which structure is intermetallic compound could be cold-rolled without process annealing up to the reduction rate in thickness of 50%, but a few cracks appear in cold-rolled ribbon in the reduction rate in thickness of 65%. The $B2{\rightarrow}R{\rightarrow}B19^{\prime}$ martensitic transformation or $B2{\rightarrow}B19^{\prime}$ martensitic transformation occurs in annealing conditions dissipating lattice defects introduced by coldrolling. However, in case of higher reduction rate or lower annealing temperature, martensitic transformation in cold-rolled and then annealed ribbons does not occur. The maximum shape recovery rate of cold-rolled ribbons with the reduction rate of 35 and 65% could be achieved at annealing temperatures of 250 and $350^{\circ}C$, respectively. The shape recovery rate seems to be related to the stress level of plateau region on stress-strain curve.

Estimation of the Ammonia Refrigeration Cycle Using LNG Cold Heat (액화천연가스 냉열을 활용한 암모니아 냉동 사이클의 추산)

  • NOH, SANGGYUN
    • Transactions of the Korean hydrogen and new energy society
    • /
    • v.29 no.4
    • /
    • pp.357-362
    • /
    • 2018
  • In this study, computer simulation and optimization works have been performed for a refrigeration cycle using ammonia as a refrigerant and also how much power was saved when the liquefied natural gas cold heat is replaced for the refrigeration cycle. PRO/II with PROVISION release 10.0 from Schneider electric company was used, and Peng-Robinson equation of the state model was selected for the modeling of the refrigeration cycle and LNG cold heat utilization process.