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Kwon, Byeong Wan,Oh, Joo Hyeng,Kim, Ghun Sik,Yoon, Sung Pil,Han, Jonghee,Nam, Suk Woo,Ham, Hyung Chul ELSEVIER 2018 APPLIED ENERGY -BARKING THEN OXFORD- Vol.227 No.-
<P><B>Abstract</B></P> <P>In this study, novel perovskite-type Sr<SUB>0.92</SUB>Y<SUB>0</SUB>.<SUB>08</SUB>TiO<SUB>3</SUB>-based catalysts were investigated for hydrogen production by the dry reforming of biogas (comprising CH<SUB>4</SUB> and CO<SUB>2</SUB>). Ni-doped Sr<SUB>0.92</SUB>Y<SUB>0</SUB>.<SUB>08</SUB>TiO<SUB>3</SUB> catalysts with improved catalytic activity were grown using the Pechini method. The prepared catalysts were characterized using X-ray diffraction to check for impurities introduced in the perovskite structure by doping method. The reforming of methane over perovskite-based catalysts has been extensively investigated; however, detailed understanding of the activating catalytic sites under different conditions is still lacking. To understand the details of the activating catalyst mechanism, transmission electron microscopy, temperature-programed reduction, X-ray photoelectron spectroscopic (XPS) analysis were performed under different activating conditions. XPS analysis of 5mol% Ni-doped Sr<SUB>0.92</SUB>Y<SUB>0.08</SUB>TiO<SUB>3</SUB> revealed that the H<SUB>2</SUB>-activated catalyst lost active lattice oxygen sites and Ni sites due to formation of Ni hydroxide. Thus, the H<SUB>2</SUB>-activated catalyst has lower catalytic activity than the N<SUB>2</SUB>-activated one.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The novel Ni-doped Sr<SUB>0.92</SUB>Y<SUB>0.08</SUB>TiO<SUB>3</SUB> was prepared via Pechini Method. </LI> <LI> The novel Ni-doped Sr<SUB>0.92</SUB>Y<SUB>0.08</SUB>TiO<SUB>3</SUB> was activated under N<SUB>2</SUB> or reduction condition. </LI> <LI> The N<SUB>2</SUB>-activated catalyst showed the better activity than the H<SUB>2</SUB>-activated case. </LI> <LI> The 5mol% Ni-doped Sr<SUB>0.92</SUB>Y<SUB>0.08</SUB>TiO<SUB>3</SUB> catalyst showed excellent long-term stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
척추마취시 Clonidine 이 마취작용시간에 미치는 영향
권재영,백승완,김해규,정규섭,김인세,김병덕 대한마취과학회 1995 Korean Journal of Anesthesiology Vol.29 No.1
Spinal anesthesia with hyperbaric tetracaine has short action duration, therefore it is inappropriate to long term operation. Clonidine has been shown to stimulate central and peripheral alpha two adrenergic receptors. By these central adrenergic action, clonidine decreases the MAC of anesthetics. Clonidine also has analgesic property following intrathecal administration. These properties may make clonidine as a useful adjunct to extend anesthesia time with spinal anesthesia. This study was undertaken to evaluate the effects of clonidine in spinal anesthesia. Thirty healthy adult patients who were scheduled for orthopedic operation below knee were divided into 3 groups: Group I (hyperbaric tetracaine 10 mg(2 ml)+N/S 1 ml), Group II (hyperbaric tetracaine 10 mg with clonidine 75 ug(0.5 ml)+N/S 0.5 ml) and Group III (hyperbaric tetracaine 10 mg with clonidine 150 ug(1 ml). We investigated the onset and duration of spinal anesthesia and hemodynamic changes (blood pressure and heart rate). The results were as follows 1) There were no significant changes between groups in hemodynamic data. 2) The onset of spinal anesthesia was more rapid in the group II (knee flexion 2.9±0.7, foot dorsiflexion 4.6±0.8 minutes) and III (knee flexion 2.0±0.4, foot dorsiflexion 4.1±0.7 minutes) than group I (knee flexion 4.9±1.6, foot dorsiflexion 9.1±3.4 minutes). 3) The time to recovery of nerve block was more prolonged in the group II (touch 256, pain 295, foot dorsiflexion 276, knee flexion 300 minutes) and III (touch 295, pain 312, foot dorsiflexion 339, knee flexion 385 minutes) than group I (touch 143, pain 176, foot dorsiflexion 178, knee flexion 195 minutes). 4) There were more sedation and dry mouth in group II and group III. From the above results, clonidine can be used as an effective adjunct in hyperbaric tetracaine spinal anesthesia to make rapid onset and prolonged anesthesia without significant hemodynamic changes. (Korean J Anesthesiol 1995; 29: 36~41)
식이와 심리요법을 병행한 CPT60 Exercise Program이 여대생들의 혈중지질에 미치는 영향
권정두(Kwon Jung-Doo),김병완(Kim Byeong-Wan),김창환(Kim Chang-Hwan),임순길(Lim Soon-Gil) 한국체육과학회 2009 한국체육과학회지 Vol.18 No.2
This research aimed to find out the physiological response(blood lipids) which appeared after applying CPT60 Exercise Program which was carried out with the diet(Chung-gook-jang) and psychology therapy(Broken windows Theory) to college women for 8 weeks. The subjects of this research were 25 college women in their twenties, who were classified into a control group(5) and experimental group(20). For the statistical processing of all data, SPSS Ver 14.0 program was used, and as the method of hypothesis testing, two-way ANOVA by repetitive measure were applied respectively. After testing the factors of blood lipids by measuring time according to exercise method(before, after 4 weeks, after 8 weeks) the results were as follows. 1. As a result of the effect of CPT60 Exercise Program which was carried out with the diet and psychology therapy on the difference in the change of blood lipid between measuring time according to exercise method showed no significant difference according to exercise method in T-C and HDL-C items. 2. There was effective difference in Tg and LDL-C items(p<.05). 3. As for the effect difference in the change of blood lipid according to the measuring time, there was an significant difference in all variables(T-C, Tg, HDL-C, and LDL-C)(p<.05).
Lee, Wonmi,Kwon, Byeong Wan,Kwon, Yongchai American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.43
<P>Alloxazine and ferrocyanide are suggested as the redox couple for an aqueous organic redox flow battery (AORFB). Alloxazine is further modified by carboxylic acid (COOH) groups (alloxazine-COOH) to increase the aqueous solubility and to pursue a desirable shift in the redox potential. For obtaining a better AORFB performance, the overall redox reactivity of AORFB should be improved by the enhancement of the rate-determining reaction of the redox couple. A carboxylic acid-doped carbon nanotube (CA-CNT) catalyst is considered for increasing the reactivity. The utilization of CA-CNT allows for the induction of a better redox reactivity of alloxazine-COOH because of the role of COOH within alloxazine-COOH as a proton donor, the fortified hydrophilic attribute of alloxazine-COOH, and the increased number of active sites. With the assistance of these attributes, the mass transfer of aqueous alloxazine-COOH molecules can be promoted. However, CA-CNT does not have an effect on the increase of the redox reactivity of ferrocyanide because the redox reaction is not affected by the same influence of protons that the redox reactivity of alloxazine-COOH is affected by. Such a behavior is proven by measuring the electron transfer rate constant and diffusivity. With regard to AORFB full cell testing, when CA-CNT is used as a catalyst for the negative electrode, the performance of the AORFB increases. Specifically, the charge-discharge overpotential and infrared drop potential are improved. As a result, the voltage efficiency affected by the potentials increases to 64%. Furthermore, the discharging capacity reaches 26.7 A h·L<SUP>-1</SUP>, and the state of charge attains 83% even after 30 cycles.</P> [FIG OMISSION]</BR>
Noh, Chanho,Kwon, Byeong Wan,Chung, Yongjin,Kwon, Yongchai Elsevier 2018 Journal of Power Sources Vol.406 No.-
<P><B>Abstract</B></P> <P>Phosphorylethanolamine (PHOS) doped carbon nanotube (CNT) is newly suggested as a catalyst for enhancing the redox reactions of vanadium ions and vanadium redox flow battery (VRFB) performance. For synthesizing the catalyst, CNT is linked to the phosphate group of the PHOS, forming phosphate functionalized carbon nanotube (POH-CNT). Its catalytic activity is then compared with those of pure CNT and carboxylic acid functionalized CNT (CA-CNT) catalysts. Regarding the redox reactivity of vanadium ions, POH-CNT exhibits superior catalytic activity and reaction reversibility for VO<SUP>2+</SUP>/VO<SUB>2</SUB> <SUP>+</SUP> reaction to CNT and CA-CNT because of (i) the chelation ability of phosphate group, (ii) its low electron delocalization capability and (iii) its high acid dissociation constant. By the role as chelating agent of phosphate group, the density of active sites for reaction of VO<SUP>2+</SUP> and VO<SUB>2</SUB> <SUP>+</SUP> ions in POH-CNT increase. Also, the low electron delocalization and high acid dissociation constant induce effective adsorption and desorption of VO<SUP>2+</SUP> and VO<SUB>2</SUB> <SUP>+</SUP> ions. Such effects facilitate the VO<SUP>2+</SUP>/VO<SUB>2</SUB> <SUP>+</SUP> reaction. In contrast, regarding V<SUP>2+</SUP>/V<SUP>3+</SUP> reaction, POH-CNT shows equivalent reactivity to CA-CNT because phosphate and carboxyl groups form similar active sites for the V<SUP>2+</SUP>/V<SUP>3+</SUP> reaction. The above results are supported by calculating kinetic parameters, such as charge transfer resistance and diffusion coefficient, while chemical bonding of the catalysts is examined by XPS. Finally, as the POH-CNT is used as catalyst for positive electrode prompting the VO<SUP>2+</SUP>/VO<SUB>2</SUB> <SUP>+</SUP> reaction, performance of VRFB single cell is improved.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Phosphorylethanolamine doped carbon nanotube (POH-CNT) is suggested as catalyst. </LI> <LI> POH-CNT exhibits superior catalytic activity for VO<SUP>2+</SUP>/VO<SUB>2</SUB> <SUP>+</SUP> redox reaction. </LI> <LI> Chelation ability of phosphate group promotes VO<SUP>2+</SUP>/VO<SUB>2</SUB> <SUP>+</SUP> redox reaction rate. </LI> <LI> Electron delocalization capability and acid dissociation constant are key factors. </LI> <LI> Performance of VRFB single cell using POH-CNT catalyst is improved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
김태권(Tae Kwon Kim),정원엽(Won Yeop Jeong),원동일(Dong Il Won),정경호(Kyeong Ho Jeong),조목량(Mok Lyang Cho),배병윤(Byeong Yoon Bae),배영완(Yeong Wan Bae) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
The present study is going to improve negative awareness and provide accurate information with customers by developing a tuning manual. The procedure of tuning manual development is divided into total 7 steps, which are suggesting its purpose, organizing theories, gathering information and components, undertaking the tuning, getting feedbacks from experts and the final manufacturing. Required components can be the suspension system, brake system, intake and exhaust system, aero parts and so on based on the type of a car. In each part, there are introductions of related laws, application theories, necessary tools and equipments as well as the work procedure and notices when working. The manual has been completed in 4 types of cars until now and will be continuously added in the different types of cars and components.