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박찬곤,이근만 淸州大學校 1982 論文集 Vol.15 No.2
This paper show the computerized method of Academic Administration. As computerizing the Course Registration and Grade Processing by this method, we can do the Academic Administration more accurately and more effectively with the advantage of cost down and simplicity in task processings.
MIcroprocessor 를 이용한 순간풍속의 측정방식에 관한 연구
이근만,박찬곤 淸州大學校 1982 論文集 Vol.15 No.2
This paper aims at discussing about a electronic measuring method of transient wind speed in contrast to the mechanic measuring method, which can only measure the average wind speed. By this method, transient wind speed can be measured at high speed owing to the minimal hardware and the shortest processing time. Thus this method will be considerably effective for the long-time monitoring of wind speed variation.
HFC-134a와 대체냉매 HFC-152a에 CF_3I를 혼합한 자동차냉매 특성
권일욱,박찬수,홍경한,문기선,최운수,서의경,윤갑식,이종인,하옥남 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
These days, an attention of environment has been increasing all over the world. to prevent the green house effect and destruction of an ozone layer, an ozone destruction potential(ODP) be zero and a refrigerant for low global warming potential(GWP) is needed. HFC-134a, in which hydrogen is mixed instead of chlorine is a refrigerant used for automobile conditioners and its destruction potential is ecologically zero. However, it is not considered as a perfect substitutive refrigerant as its GWP is high. It is studied refrigerant mixtures in which HFC-134a, HFC-152a and CF_3I with low GWP and zero ODP are mixed by experimentally and concluded as follows; 1. with the variation of speed of compressor outside temperature and flow rate, the heat of evaporator and compressor and coefficient of performance was varied, and influenced the air conditioner. 2. The pressure of evaporator was decreased with increasing the speed of compressor and that of the refrigerant HFC-134a was higher 21% than that of azotrope refrigerant mixed with CF_3I. The overall capacity of condensor and evaporator was increased and HGC-134a was higher than azotrope refrigerant mixed with CF_3I 3. The capacity of evaporator with the refrigerant HFC-134a was higher 6% than azotrope refrigerant mixed with CF31 and the required power with zaotrope refrigerant mixed with CF_3I was higher 11% than that of HFC-134a. 4. The COP of the refrigerant FHC-134a was higher 31% in 1000RPM. when outside temperature was increased, COP was decreased. 5. Performance of HFC-134a is better than azotrope refrigerant mixed with CF_3I but prefered zaotrope refrigerant mixed with CF_3I considering the environment.
( Chan Guk Park ),( Mei Jin Wu ),( Chansik Hong ),( Ju Yeon Jo ),( Han Yi Jiao ),( Hyun Park ),( Jae Yeoul Jun ),( Seok Choi ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2018 Journal of Neurogastroenterology and Motility (JNM Vol.24 No.1
Background/Aims We investigated the role of representative endoplasmic reticulum proteins, stromal interaction molecule 1 (STIM1), and store-operated calcium entry-associated regulatory factor (SARAF) in pacemaker activity in cultured interstitial cells of Cajal (ICCs) isolated from mouse small intestine. Methods The whole-cell patch clamp technique applied for intracellular calcium ions ([Ca<sup>2+</sup>]i) analysis with STIM1 or SARAF overexpressed cultured ICCs from mouse small intestine. Results In the current-clamping mode, cultured ICCs displayed spontaneous pacemaker potentials. External carbachol exposure produced tonic membrane depolarization in the current-clamp mode, which recovered within a few seconds into normal pacemaker potentials. In STIM1-overexpressing cultured ICCs pacemaker potential frequency was increased, and in SARAF-overexpressing ICCs pacemaker potential frequency was strongly inhibited. The application of gadolinium (a non-selective cation channel inhibitor) or a Ca<sup>2+</sup>-free solution to understand Orai channel involvement abolished the generation of pacemaker potentials. When recording intracellular Ca<sup>2+</sup> concentration with Fluo 3-AM, STIM1-overexpressing ICCs showed an increased number of spontaneous intracellular Ca<sup>2+</sup> oscillations. However, SARAF-overexpressing ICCs showed fewer spontaneous intracellular Ca<sup>2+</sup> oscillations. Conclusion Endoplasmic reticulum proteins modulated the frequency of pacemaker activity in ICCs, and levels of STIM1 and SARAF may determine slow wave patterns in the gastrointestinal tract. (J Neurogastroenterol Motil 2018;24:128-137)
Green Diacetoxylation of Alkenes in a Microchemical System
Park, Jeong Hyeon,Park, Chan Yi,Song, Hyun Seung,Huh, Yun Suk,Kim, Geon Hee,Park, Chan Pil American Chemical Society 2013 Organic letters Vol.15 No.4
<P>The palladium-catalyzed diacetoxylation and trifluoromethanesulfonic acid-catalyzed diacetoxylation using inexpensive and environmentally friendly hydrogen peroxide and peracetic acid were successfully conducted with the help of microchemical technology. Excellent yield and selectivity were achieved in significantly shortened reaction times without the decomposition of explosive oxidants and further transformation of unstable products, offering a safe and efficient alternative to traditional methods for alkene diacetoxylation.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2013/orlef7.2013.15.issue-4/ol3026445/production/images/medium/ol-2012-026445_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol3026445'>ACS Electronic Supporting Info</A></P>
Continuous-Flow Synthesis of <i>meta</i>-Substituted Phenol Derivatives
Park, Jeong Hyeon,Park, Chan Yi,Kim, Mi Jin,Kim, Min Uk,Kim, Young Joon,Kim, Geon-Hee,Park, Chan Pil American Chemical Society 2015 Organic process research & development Vol.19 No.7
<P>Two complementary microreactor technologies were developed for the study of biphasic gas–liquid reactions and preparation of <I>meta</I>-substituted phenol derivatives. The first capillary microreactor, composed of a T-junction and simple capillary, enabled oxidative Heck/dehydrogenation on a microgram scale with a shortened reaction time; the total sequence time for oxidative Heck/dehydrogenation reactions was optimized from 2160 min in a traditional batch system to 130 min in the microchemical system. The second tube-in-tube microreactor, composed of a gas-permeable inner tube and gas-nonpermeable outer tube, successfully performed a gram-scale synthesis under the optimized safety and economic conditions which were established from the first microgram-scale study. The two microreactors have great potential for exploring reactions involving gaseous and liquid reagents.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/oprdfk/2015/oprdfk.2015.19.issue-7/acs.oprd.5b00077/production/images/medium/op-2015-00077e_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/op5b00077'>ACS Electronic Supporting Info</A></P>
Park, Jong-Chan,Han, Sun-Ho,Byun, Min S.,Yi, Dahyun,Lee, Jun Ho,Park, Kyua,Lee, Dong Young,Mook-Jung, Inhee Frontiers Media S.A. 2017 FRONTIERS IN AGING NEUROSCIENCE Vol.9 No.-
<P>Alzheimer's disease (AD), characterized by progressive cognitive decline, is the most prevalent neurodegenerative disease in the elderly. Cerebral β-amyloid (Aβ) deposition is the major pathological hallmark of AD. Recent studies also have shown that the serum level of phosphorus correlates to the risk of incident dementia. To date, the linkage between cerebral Aβ deposition and the serum phosphorus level remains unknown. In this study, we analyzed the levels of serum phosphorus in 109 mild cognitive impairment (MCI) and 73 AD dementia (ADD) subjects. All subjects underwent Pittsburgh compound B positron emission tomography (PiB-PET) imaging to measure cerebral Aβ deposition. The results with Aβ deposition was compared with the serum levels of phosphorus. The subjects with cerebral Aβ deposition showed lower levels of serum phosphorus than those without Aβ deposition. Furthermore, multiple regression analyses showed that a low level of serum phosphorus correlated with cerebral Aβ deposition, even when age, sex, apolipoprotein E ε4 genotype, and MMSE z-score were controlled for. Serum levels of other ions, including calcium, iron, zinc, and copper, showed no such correlation. In conclusion, our results suggest that the serum level of phosphorus may be used as an easily accessible blood biomarker for cerebral Aβ deposition in a cognitively impaired population.</P>
Park, Chan-yi,Nguyen-Phu, Huy,Shin, Eun Woo Elsevier 2017 Molecular catalysis Vol.435 No.-
<P>La2O2CO3/ZnO catalysts for glycerol carbonation with CO2 to produce glycerol carbonate were prepared by two different methods - co-precipitation (conventional method) and ethylene glycol combustion (novel method) and investigated their catalytic properties and performance through characterization and reaction tests. La2O2CO3/ZnO prepared by the novel method (NLZ) showed higher yields of glycerol carbonate than La2O2CO3/ZnO prepared by the conventional method (CLZ) due to extremely high selectivity of glycerol carbonate by NLZ, even though NLZ exhibited lower glycerol conversions. Depending on the preparation method, predominant La2O2CO3 phases were different: monoclinic La2O2CO3 for NLZ and hexagonal La2O2CO3 for CLZ. From characterization of the spent catalysts, zinc glycerolate, an intermediate in this reaction, was formed in a large aggregate of nanoparticles over the spent CLZ, while the spent NLZ contained a trace amount of zinc glycerolate. These different catalytic behaviors were explained on the basis of catalytic reaction routes and La2O2CO3 structures. (C) 2017 Elsevier B.V. All rights reserved.</P>