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Yan, Shi Run,Lee, Kyu Wan,Jun, Ki Won,Lee, Sang Bong,Choi, Myoung Jae,Hong, Ji Sook 한국화학공학회 1999 Korean Journal of Chemical Engineering Vol.16 No.3
The hydrogenation of CO₂ to hydrocarbons over a precipitated Fe-Cu-Al/K catalyst was studied in a slurry reactor for the first time. Reducibility of the catalyst and effect of reaction variables (temperature, pressure and H₂/CO₂ ratio of the feed gas) on the catalytic reaction performance were investigated. The reaction results indicated that the Fe-Cu-Al/K catalyst showed a good CO₂ hydrogenation performance at a relatively low temperature (533 K). With the increase of reaction temperature CO₂ conversion and olefin to paraffin (O/P) ratio in C₂-C₄ hydrocarbons as well as the selectivity to C₂-C₄ fraction increased, while CO and CH₄ selectivity showed a reverse trend. With the increase in reaction pressure, CO₂ conversion and the selectivity to hydrocarbons increased, while the CO selectivity and O/P ratio of C₂-C₄ hydrocarbons decreased. The investigation of H₂/CO₂ ratio revealed that CO₂ conversion and CH₄ selectivity increased while CO selectivity and O/P ratio of C₂-C₄ decreased with increasing H₂/CO₂ ratio.
Improvement Research on S-MAC Protocol in Wireless Sensor Network
Yan Shi,Jing Jin,Jianxian Cai 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.12
This paper strengthens the application of adaptive listening technology in S-MAC. When the nodes have no data to process, they are in dormancy state for most of the time, while when the data is coming, they become active quickly and participate in data transmission actively. The nodes which can feel the transmission is just around will participate in adaptive transmission as much as possible and make continuous adaptive listening within one dormancy period. In this way, realize the purpose of deceasing end to end delay greatly on the basis of not increasing additional energy consumption. For applications which are sensitive to system response time, the improved S-MAC is with greater application value.
Yan Lan,Yan-Zhao Yang,Xian Jiang,Guang-Shi Jin,김민선,박병림,Yuan-Zhe Jin,Li-Wei Li 대한약리학회 2013 The Korean Journal of Physiology & Pharmacology Vol.17 No.4
Contribution of the vestibular end organ to regulation of arterial pressure was quantitatively compared with the role of baroreceptors in terms of baroreflex sensitivity and c-Fos protein expression in the rostral ventrolateral medulla (RVLM). Baroreflex sensitivity and c-Fos protein expression in the RVLM were measured in conscious rats that had undergone bilateral labyrinthectomy (BL) and/or baroreceptor unloading. BL attenuated baroreflex sensitivity during intravenous infusion of sodium nitroprusside (SNP), but did not significantly affect the sensitivity following infusion of phenylephrine (PE). Baroreflex sensitivity became positive following sinoaortic denervation (SAD) during infusion of PE and attenuated sensitivity during infusion of SNP. Baroreflex sensitivity also became positive following double ablation (BL+SAD) during infusion of PE, and attenuated sensitivity during infusion of SNP. c-Fos protein expression increased significantly in the RVLM in the sham group after SNP administration. However, the BL, SAD, and SAD+BL groups showed significant decreases in c-Fos protein expression compared with that in the sham group. The SAD group showed more reduced c-Fos protein expression than that in the BL group, and the SAD+BL group showed less expression than that in the SAD group. These results suggest that the vestibular system cooperates with baroreceptors to maintain arterial pressure during hypotension but that baroreceptors regulate arterial pressure during both hypotension and hypertension. Additionally, afferent signals for maintaining blood pressure from the vestibular end organs and the baroreceptors may be integrated in the RVLM.
지각된 글로벌성/지역성의 선행요인과 구매가능성에 미치는 효과에 관한 연구
( Yan Shi ),김현순 ( Kim Hyun-soon ) 한국유통경영학회(구 한국유통정보학회) 2016 유통정보학회지 Vol.19 No.5
Purpose: In this study, we focuses on the relationship between antecedents factors (perceived hedonic value and perceived functional value) and consequences of perceived brand globalness(PBG)/perceived brand localness (PBL) in China. Research design, data, and methodology: This study theoretically analyzed relationship between functional/hedonic value and PBG/PBL and relationship between PBG/PBL and purchase intention. 695 sample data is collected in China to empirical test. For measurement model test, confirmatory factor analysis (CFA) and correlation analysis were conducted and to test hypotheses, OLS analysis is conducted using Process macro proposed by Preacher and Hayes (2008). Results: This study show that both functional value and hedonic value have positive effect on PBG/PBL. However, hedonic value affect PBG more strongly than functional value while functional value affect PBL more strongly than hedonic value. And PBG have more strong effects on purchase intention than PBL. Conclusions: The result show that hedonic value is more important to establish PBG and functional value is more important to establish PBL. Therefore managers need to reinforce functional or hedonic attributes of their brand in line with their positioning strategy. Global franchise brands are able to convince consumers more strongly of their global positioning through reinforcing attributes related to hedonic value, while local brands are able to convince consumers of their local positioning through reinforcing attributes related to functional value.
Yan Lan,Huan-Jun Lu,Xian Jiang,Li-Wei Li,Yan-Zhao Yang,Guang-Shi Jin,박주영,김민선,박병림,Yuan-Zhe Jin 대한약리학회 2015 The Korean Journal of Physiology & Pharmacology Vol.19 No.2
Input signals originating from baroreceptors and vestibular receptors are integrated in the rostralventrolateral medulla (RVLM) to maintain blood pressure during postural movement. The contributionof baroreceptors and vestibular receptors in the maintenance of blood pressure following hypotensionwere quantitatively analyzed by measuring phosphorylated extracellular regulated protein kinase(pERK) expression and glutamate release in the RVLM. The expression of pERK and glutamate releasein the RVLM were measured in conscious rats that had undergone bilateral labyrinthectomy (BL)and/or sinoaortic denervation (SAD) following hypotension induced by a sodium nitroprusside (SNP)infusion. The expression of pERK was significantly increased in the RVLM in the control groupfollowing SNP infusion, and expression peaked 10 min after SNP infusion. The number of pERKpositive neurons increased following SNP infusion in BL, SAD, and BL+SAD groups, although theincrease was smaller than seen in the control group. The SAD group showed a relatively higherreduction in pERK expression when compared with the BL group. The level of glutamate release wassignificantly increased in the RVLM in control, BL, SAD groups following SNP infusion, and thispeaked 10 min after SNP infusion. The SAD group showed a relatively higher reduction in glutamaterelease when compared with the BL group. These results suggest that the baroreceptors are morepowerful in pERK expression and glutamate release in the RVLM following hypotension than thevestibular receptors, but the vestibular receptors still have an important role in the RVLM.
Dimensionless study on dynamics of pressure controlled mechanical ventilation system
Yan Shi,Jinglong Niu,Maolin Cai,Weiqing Xu 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2
Dynamics of mechanical ventilation system can be referred in pulmonary diagnostics and treatments. In this paper, to convenientlygrasp the essential characteristics of mechanical ventilation system, a dimensionless model of mechanical ventilation system is presented. For the validation of the mathematical model, a prototype mechanical ventilation system of a lung simulator is proposed. Through thesimulation and experimental studies on the dimensionless dynamics of the mechanical ventilation system, firstly, the mathematical modelis proved to be authentic and reliable. Secondly, the dimensionless dynamics of the mechanical ventilation system are obtained. Last, theinfluences of key parameters on the dimensionless dynamics of the mechanical ventilation system are illustrated. The study provides anovel method to study the dynamic of mechanical ventilation system, which can be referred in the respiratory diagnostics and treatment.