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삼나무 (杉) 내한성 (耐寒性) 품종 선발에 관한 연구
홍성각,조태환,황증 ( Sung Gak Hong,Tae Hwan Cho,Jeung Hwang ) 한국산림과학회 1981 한국산림과학회지 Vol.51 No.1
This study was designed to know difference in degree of dehardening and rehardening respectively by artificial high and low temperature treatments among different clonal seedlings and seedlings from different seed sources of Cryptomeria japonica which have been grown under the cold areas in Japan and Korea. High temperature treatment was done with 15 to 20℃ under 100% relative humidity for one to nine days and low temperature treatment was carried with -7℃ for one to three days. Occasionaly, high temperature treatment was combined and followed by low temperature treatment. The ability of stem section to delay dehardening by high temperature treatment and/or to hasten rehardening by low temperature treatment was used as an indicator of adaptability under extreme temperature fluctuation in nature. Clones and seedlings from different seed sources which showed greater freezing resistance than others after artificial high and/or low temperature treatments were selected over two to three time periods: early winter, mid winter and early spring in 1977 to 1980. These were Seoul #7, and #9, Namboo #3, and #4, Sung-Kang #11, Chung-Sam #8 and Huek-Suk #9. These selected seedlings might have survival advantage to withstand early and late frost damage, especially the critical frost damage of the basal stem, since it was known to be induced by lowering freezing resistance of the basal part when exposed to the high temperature near the ground during the day. Large variation in freezing resistance and degree of dehardening and rehardening was found among clonal or seed sources and among individuals within a seed source, but was not related to the difference in climatic conditions where the parent trees was selected. These indicated the possibility of future breeding work for more cold resistant family of Cryptomeria japonica.
Directing the Distribution of Potassium Cations in Zeolite-LTL through Crown Ether Addition
Cho, Hae Sung,Hill, Adam R.,Cho, Minhyung,Miyasaka, Keiichi,Jeong, Kyungmin,Anderson, Michael W.,Kang, Jeung Ku,Terasaki, Osamu The American Chemical Society 2017 CRYSTAL GROWTH AND DESIGN Vol.17 No.9
<P>We discover that the crystal morphology of zeolite-LTL could be modified by crown ether (21-crown-7, CE), where CE decreases the aspect ratio of zeolite-LTL while increasing the nucleation of domains on the (0001) face and hindering their growth along the c-axes. Moreover, the study using scanning electron microscopy supports that the ratio between the rates for generation of cancrinite columns and bridging cancrinite columns on the {10 (1) over bar0} face remains constant among the LTL frameworks with different amounts of CE molecules. In addition, X-ray diffraction analysis shows that potassium cations redistribute into pore cavities (t-lil) from cancrinite cages (t-can) and t-ste cages by the strong interactions between potassium and CE as the amount of CE molecules is increased. Additionally, Monte Carlo simulations clarify that stabilization of the t-lil cage via the redistribution of potassium cations at high CE concentration is attributed to the dominant effect in the crystal morphology changes observed. To understand the catalytic and adsorption properties of zeolites, it is important to investigate their structure/property relationships. Especially, studying the morphology of an anisotropic zeolite crystals has been of great interest because of the strong influence on controlling its properties. Thus, morphological control of the material with a particular crystallographic direction is highly desirable to obtain maximum properties for applications.</P>
Cho, Hyo Chang,Wang, Bo,Ahn, Cheol Hee,Go, Jeung Sang Elsevier 2017 Sensors and actuators. A Physical Vol.258 No.-
<P><B>Abstract</B></P> <P>Compact thermo-fluidic systems with complex and narrow gap flow passages, such as heat exchangers, are attractive for use in high energy efficiency applications. However, the narrow gap flow passage limits the experimental evaluations as a result of the size of the commercial sensors and the numerical evaluations of the full model due to massive computational meshes. This paper presents a new method to measure the distribution of the static pressure and wall temperature in the narrow gap. The 300μm-thick stainless steel plate embedded with thermocouple temperature sensors and pressure tapping holes connected with microchannels is fabricated, and the temperature and pressure measurements are calibrated through comparisons with commercial sensors. In the experimental evaluation, the 23 flat plates are stacked with a narrow gap and the sensor-embedded plate is placed in the center. Then, the stacked plate thermo-fluidic system is installed in a wind tunnel. The measurement of the static pressure and wall temperature distributions in the narrow gap is performed successfully for the increased inlet flow velocities. The static pressures are measured at five different micro tapping holes, and the measurements exhibit a standard deviation of ±3.51Pa for the same inlet velocity. Furthermore, the wall temperatures have good agreement with the reference temperatures measured at the inlet.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The pressure and temperature sensors-embedded thin metal plate is newly fabricated. </LI> <LI> Distribution of static pressure and wall temperature inside narrow gap is measured. </LI> <LI> Experimental measurements are compared with numerical results for evaluation. </LI> <LI> Sensors-embedded plate solves measurement limitation of compact and complex systems. </LI> </UL> </P>
Extremely low‐frequency magnetic fields modulate nitric oxide signaling in rat brain
Cho, Sung In,Nam, Yun Sung,Chu, Li Ying,Lee, Jong Hyuk,Bang, Joon Seok,Kim, Hye Ryoun,Kim, Hyoung‐,Chun,Lee, Yu Jeung,Kim, Hyeong‐,Dong,Sul, Jung Duk,Kim, Daejin,Chung, Yoon Hee,Jeong, Ji Wiley Subscription Services, Inc., A Wiley Company 2012 BioElectroMagnetics Vol.33 No.7
<P><B>Abstract</B></P><P>Our previous study has shown that an extremely low‐frequency magnetic field (ELF‐MF) induces nitric oxide (NO) synthesis by Ca<SUP>2+</SUP>‐dependent NO synthase (NOS) in rat brain. The present study was designed to confirm that ELF‐MF affects neuronal NOS (nNOS) in several brain regions and to investigate the correlation between NO and nNOS activation. The exposure of rats to a 2 mT, 60 Hz ELF‐MF for 5 days resulted in increases of NO levels in parallel with cGMP elevations in the cerebral cortex, striatum, and hippocampus. Cresyl violet staining and electron microscopic evaluation revealed that there were no significant differences in the morphology and number of neurons in the cerebral cortex, striatum, and hippocampus. Differently, the numbers of nNOS‐immunoreactive (IR) neurons were significantly increased in those cerebral areas in ELF‐MF‐exposed rats. These data suggest that the increase in NO could be due to the increased expression and activation of nNOS in cells. Based on NO signaling in physiological and pathological states, ELF‐MF created by electric power systems may induce various physiological changes in modern life. Bioelectromagnetics 33:568–574, 2012. © 2012 Wiley Periodicals, Inc.</P>
Extra adsorption and adsorbate superlattice formation in metal-organic frameworks
Sung Cho, Hae,Deng, Hexiang,Miyasaka, Keiichi,Dong, Zhiyue,Cho, Minhyung,Neimark, Alexander V.,Ku Kang, Jeung,Yaghi, Omar M.,Terasaki, Osamu Nature Publishing Group, a division of Macmillan P 2015 Nature Vol.527 No.7579
Metal-organic frameworks (MOFs) have a high internal surface area and widely tunable composition, which make them useful for applications involving adsorption, such as hydrogen, methane or carbon dioxide storage. The selectivity and uptake capacity of the adsorption process are determined by interactions involving the adsorbates and their porous host materials. But, although the interactions of adsorbate molecules with the internal MOF surface and also amongst themselves within individual pores have been extensively studied, adsorbate–adsorbate interactions across pore walls have not been explored. Here we show that local strain in the MOF, induced by pore filling, can give rise to collective and long-range adsorbate–adsorbate interactions and the formation of adsorbate superlattices that extend beyond an original MOF unit cell. Specifically, we use in situ small-angle X-ray scattering to track and map the distribution and ordering of adsorbate molecules in five members of the mesoporous MOF-74 series along entire adsorption–desorption isotherms. We find in all cases that the capillary condensation that fills the pores gives rise to the formation of ‘extra adsorption domains’—that is, domains spanning several neighbouring pores, which have a higher adsorbate density than non-domain pores. In the case of one MOF, IRMOF-74-V-hex, these domains form a superlattice structure that is difficult to reconcile with the prevailing view of pore-filling as a stochastic process. The visualization of the adsorption process provided by our data, with clear evidence for initial adsorbate aggregation in distinct domains and ordering before an even distribution is finally reached, should help to improve our understanding of this process and may thereby improve our ability to exploit it practically.
Cho, Kyung-Hyun,Lee, Jeung-Hee,Kim, Jin-Man,Park, Sang-Hyun,Choi, Myung-Sook,Lee, Yun-Mi,Choi, In-Ho,Lee, Ki-Teak The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.2
We recently reported that a synthetic edible oil-containing monoacylglyceride (MAG) and diacylglyceride (DAG) exerted anti-atherosclerotic effects. In order to further investigate the activities and individual effects of MAG and DAG on the atherosclerotic process, we prepared a structured oil with various MAG and DAG contents and tested them both in vitro and in vivo, using C57BL/6 mice. The structured oil to be tested was mixed (final concentration 5%, wt/wt) with a high-cholesterol high-fat diet (1.2% cholesterol/15% fat/0.5% sodium cholate) and provided to the mice for 7 weeks. After administration, the mice consuming MAG97%-oil and DAG50%/MAG10%-oil evidenced 17% and 24% decreases in plasma total cholesterol (TC) level, respectively, as compared to a group of mice fed on lard. The experimental mice also had reduced plasma triglyceride concentrations and elevated high-density lipoprotein-cholesterol to TC ratios, by up to 31% in the case of the DAG50%/MAG10%-oil fed mice. The mice fed on MAG97%-oil exhibited elevated plasma antioxidant activity and lecithin:cholesterol acyltransferase activity. Histological assessments of the livers of the mice showed that the consumption of MAG-containing oil attenuated the adhesion of inflammatory cells and also ameliorated fatty liver changes, as compared to what was observed in the case of DAG85%-oil consumption. In conclusion, the MAG-containing oil exhibited anti-inflammatory and antioxidant activities in vivo, as well as in vitro inhibitory activity against human cholesteryl ester transfer protein. These results provide us with new insights into MAG-containing oil in terms of hypocholesterolemic effects and antioxidant activities.
하이브리드 열교환기 적용 컴팩트 고압 스팀 유닛 개발에 관한 기초 연구
김정훈(Jeung-Hoon Kim),임계훈(Gye-Hun Lim),김승현(Seung-Hyun Kim),진철규(Chul-Kyu Jin),박재홍(Jae-Hong Park),조성열(Sung-youl Cho),홍인기(In-Ki Hong),이상래(Sang-Rae Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
In the various plants such as power plant and petro-chemical plant and industrial facilities such as unit factory, the demand of heating and hot-water supply system using steam are more and more increasing. Compact steam unit is one of good solution in terms of energy reuse as system for making hot water and hot-water supply water using closed-loop system. It was intended to understand the characteristics of heat transfer and pressure drop using hybrid heat exchanger to apply high pressure compact steam unit(CSU) for industrial plants and unit factory by experimental methods. The experimental results are the followings. Heat balance between hot side and cold side was within ± 5 %. j factor was increased linearly as the Reynolds number was increased. And, Overall heat transfer coefficient exceeded 4,750 kcal/㎡h℃ when the flow velocity was 0.5 m/s above on both first test(narrow gap side) and second test(wide gap side). And, f factor was decreased as the Reynolds number was increased. Finally, pressure drop per unit length was below 0.5 bar/m on both first test(narrow gap side) and second test(wide gap side).