Research and Design of Automatic Control System of Hot Water Boiler Based On PLC

Xu Hui-jun 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.7

In this paper, there are three scheme of PLC+ PC control program have been put forward for l0T/h hot water boiler. The multi variable, nonlinear, uncertain complex process automatic control is realized, and the thermal efficiency of the hot water boiler is improved. Each boiler in the system is controlled by the respective PLC, the public part is controlled by a set of PLC, an industrial control computer as an engineer station, an industrial control computer as an operator station, field bus Profibus-DP network was comprised by Industrial control computer, PLC. Fameview software was designed to achieve the redundant control of the upper monitor of the two boiler.

Research on the Key Technologies of Boiling Flow and Heat Transfer Simulation Based on Two Fluid Model

Xu Hui-jun 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.7

Because of its high heat transfer efficiency, compact structure and many kinds of heat transfer characteristics, the plate fin heat exchanger has been widely used in the field of natural gas liquefaction. The interior of the plate fin heat exchanger, mainly composed of many small rectangular channels, and the heat transfer of hydrocarbon mixed refrigerant in the interior. For the research on the rectangular of hydrocarbon mixed refrigerant flow boiling and heat transfer in the minichannels of plate fin heat exchanger, explore the related mechanism of hydrocarbon mixed refrigerant boiling flow and heat transfer in the interior, which will assist in liquefied natural gas field of plate fin heat exchanger thermal performance design; at the same time, it is also driven by the China natural gas liquefaction systems for large thermal equipment, improve the energy saving of heat equipment or system is the key.

Association of Leptin Receptor Lys109Arg and Gln223Arg Polymorphisms with Increased Risk of Clear Cell Renal Cell Carcinoma

Mu, Hui-Jun,Zou, Jian,Xie, Ping,Xu, Zhuo-Qun,Ruan, Jun,Yang, Shu-Dong,Yin, Ying Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.10

Background: Although roles of genetic polymorphisms of leptin receptor (LEPR) gene in several cancers have been documented, the association between polymorphisms of LEPR and clear cell renal cell carcinoma (CC-RCC) remains unknown. The aim of this study was to explore any relation. Materials and Methods: The study population consisted of 77 patients with CC-RCC and 161 healthy control subjects. Polymorphism analyses of Lys109Arg and Gln223Arg were performed by direct DNA sequencing and PCR-restriction fragment length polymorphism approaches respectively. Results: Comparisons of allelic and genotypic frequencies in Lys109Arg and Gln223Arg showed no significant difference between the cases and controls. However, when evaluating the combined genotype of Lys109Arg and Gln223Arg, risk with GG/GG was increased (OR=1.85, 95%CI=1.04-3.30) and with GA/GG or GG/GA was decreased (OR=0.07, 95%CI=0.01-0.54; OR and 95%CI of the latter could not be calculated for a value of zero). Furthermore, the G-G haplotype frequency of Lys109Arg and Gln223Arg in the cases was higher (OR=1.68; 95%CI=1.02-2.76). In contrast, the A-G and G-A haplotype frequencies in the cases were lower than those in the controls (OR=0.06; 95%CI=0.01 to 0.47; OR and 95%CI of the latter could not be calculated for a value of zero). In addition, the Lys109Arg A allele was in LD with the Gln223Arg A allele (d'=0.9399) in the CC-RCC subjects, but not in the controls. Conclusions: Our data suggest that the GG/GG combined genotype and G-G haplotype of Lys109Arg and Gln223Arg can act as evaluating factors for CC-RCC risk.

중국 유학생 한국 관련 브이로그(VLOG)에 대한 시청동기가 시청만족도, 국가이미지 및 방문의도에 미치는 영향

서휘진 ( Jun Xu Hui ),김종무 ( Kim¸ Jongmoo ) 커뮤니케이션디자인학회 2021 커뮤니케이션 디자인학연구 Vol.76 No.-

본 연구에서는 중국 시청자들이 중국 유학생 한국 일상생활 관련 브이로그 콘텐츠 시청동기가 시청만족도 및 한국의 국가이미지와 방문의도에 어떤 영향을 미치는지를 분석하였다. 본 연구는 설문지를 이용하여 양적 데이터 분석과 조사 연구를 중심으로 진행되었으며 중국 내 대형 동영상 플랫폼 틱톡(TikTok)의 중국 유학생 한국 일상생활 관련 브이로그를 샘플로 선택하여 연구를 진행하였다. 연구 결과는 다음과 같다. 첫째, 시청 동기 요인 중 휴식/오락 요인, 사교적 필요성 요인, 정보 획득 요인은 시청만족도에 긍정적인 영향을 미칠 수 있는 것으로 나타났으며 휴식/오락 요인과 정보 획득 요인은 국가이미지에도 역시 긍정적인 영향력을 갖는 것으로 나타났다. 둘째, 시청 동기가 방문의도에 미치는 영향을 검증한 결과에선 사교적 필요성 요인과 정보 획득 요인이 방문의도에 정(+)의 영향력을 갖는 것으로 나타났다. 연구 결과에 따르면 정보 획득 요인은 가장 중요한 시청 동기 요인으로 나타났으며 휴식/오락 요인과 사교적 필요성 요인은 시청만족도 및 국가이미지 그리고 방문의도에 어느 정도의 영향력을 미치고 있는 것을 확인할 수 있었다. This study understands the Chinese audience's viewing motivation of watching VLOG content related to the daily life of Chinese students in Korea based on the network-based cross-cultural communication, and studies the influence of each viewing motivation on viewing satisfaction, South Korea's national image and visit intention. This study uses questionnaires, focuses on quantitative data analysis and investigation, and selects VLOGs related to the Korean daily life of Chinese students on TikTok, a large-scale video platform in China, as samples for research. The results are as follows. First, among the viewing motivation factors, rest/entertainment factors, social necessity factors and information acquisition factors have a positive impact on viewing satisfaction, and rest/entertainment factors and information acquisition factors also have a positive impact on the national image. Second, the results of verifying the influence of viewing motivation on access intention show that social necessity factors and information acquisition factors have a positive influence on access intention. According to the research results, obtaining information is the most important viewing motivation factor, and rest/entertainment factors and social necessity factors have a certain influence on viewing satisfaction, national image and visiting intention.

Deposition of Nd-Doped Fe2O3 Nanoparticles on Cenosphere by Hydrothermal Method

Hui Zhang,Yuanyuan Shi,Jun Xu,Runjun Sun 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.3

A layer of flake-like Fe2O3 particles doped with rare earth Nd3+ ions is homogeneously coated on the surface of cenosphere by using ferric nitrate as the iron source, tartaric acid as the precipitating agent, hexadecyl trimethyl ammonium bromide as the dispersing agent and neodymium nitrate as the dopant via a facile hydrothermal route. The as-prepared cenosphere is characterized by various analytical techniques such as field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy, vibrating sample magnetometry, thermal gravimetric analysis, differential scanning calorimetry, diffuse reflectance spectroscopy, photoluminescence spectroscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The performances of photocatalytic degradation of methylene blue dye are also investigated under ultraviolet and visible light irradiations. The experimental results indicate that the doping concentration of Nd3+ ions is optimized as 0.4% with respect to Fe3+ ions, and the rare earth Nd3+ ions are highly dispersed onto Fe2O3 particle surface. After being doped with Nd3+ ions, the photoactivity of the 0.4% Nd-doped Fe2O3 coated cenosphere is distinctly improved. The magnetic properties are also enhanced to a large extent.

De novo assembly of the transcriptome for Greenbug (Schizaphis graminum Rondani) and analysis on insecticide resistance-related genes

Jun-Jie LIU,Liu-Yang LU,Hui-Hui LIU,Ya-She LI,Xu SU,Bai-Zhong ZHANG,Xi-Ling CHEN 한국곤충학회 2019 Entomological Research Vol.49 No.8

The greenbug, Schizaphis graminum Rondani is a major pest species of wheat crops. In this study, a transcriptome sequencing, and the expression of the 12 genes related to insecticide resistance were conducted in S. graminum. The sequencing and subsequent bioinformatics analysis outputed 46,593 unigenes, among which 28,289 unigenes were annotated to corresponding functions by blasting with high homologous genes in database, giving annotation rate of 60.72%. To gain insight into the mechanism of insecticide resistance, the expression of the 12 genes related to insecticide resistance for S. graminum was investigated. The expression level of aminopeptidase N (AN), cytochrome P450 (CYP), acetylcholinesterase 1 (AC), catalase (CAT), cytochrome c oxidas (CCC), GABA receptor (GABA), glutathione S-transferase (GST) were highest in the apterous nymphs among different developmental stages; The expression level of AN, CBL, CYP, CA, SD, and GST were relatively more abundant in the abdomen compared to head and throax. The results could give out the key information about the relationship between the expression of these genes in different developmental stages, tissues, treatments and metabolism of insecticides. These genes that were co-up-regulated significantly in third instar nymphs of S. graminum induced by imidacloprid, were consistent with their putative involvement in insecticide resistance. This provides most comprehensive transcriptome data for S. graminum to further study and managenment.

Controllable tuning of the electronic transport in pre-designed graphene nanoribbon

Hui Zeng,Jun Zhao,Jianwei Wei,Dahai Xu,J.-P. Leburton 한국물리학회 2012 Current Applied Physics Vol.12 No.6

We make use of ab initio density functional theory calculation to explore the electronic and transport properties of zigzag-edged graphene nanoribbon (ZGNR) with peculiar designed electronic transport channels by tailoring the atomic configuration of the nanostructure. Tailoring the atomic structure has significant influences on the electronic transport of the defective nanostructure, and eventually the metal-semiconducting transition are identified with the increasing number of missing atoms. Our results demonstrate that pre-designed graphene nanoribbon by selective tailoring with high precision is expected to be served as the basic component for nanoelectronic device.

A Deep Investigation of the Thermal Decomposition Process of Supported Silver Catalysts

Jun Jiang,Tianhao Xu,Yaping Li,Xiaodong Lei,Hui Zhang,D. G. Evans,Xiaoming Sun,Xue Duan 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.6

A deep understanding of the metallic silver catalysts formation process on oxide support and the formation mechanism is of great scientific and practical meaning for exploring better catalyst preparing procedures. Herein the thermal decomposition process of supported silver catalyst with silver oxalate as the silver precursor in the presence of ethylenediamine and ethanolamine is carefully investigated by employing a variety of characterization techniques including thermal analysis, in situ diffuse reflectance infrared Fourier transform spectroscopy, scanning electron microscopy, and X-ray diffraction. The formation mechanism of supported silver particles was revealed. Results showed that formation of metallic silver begins at about 100 oC and activation process is essentially complete below 145 oC. Formation of silver was accompanied by decomposition of oxalate group and removal of organic amines. Catalytic performance tests using the epoxidation of ethylene as a probe reaction showed that rapid activation (for 5 minutes) at a relatively low temperature (170 oC) afforded materials with optimum catalytic performance, since higher activation temperatures and/or longer activation times resulted in sintering of the silver particles.

Dinuclear Triphenylphosphine-Cyclopalladated 2,4-Dichloropyrimidine Complex with a Pd–Pd Bond: Synthesis, Crystal Structure, and Application in Suzuki Reaction of 3-(Hydroxymethyl)phenylboronic Acid in Water

Hui Gao,Chen Xu,Hong-Mei Li,Xin-Hua Lou,Zhi-Qiang Wang,Wei-Jun Fu 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.9

Enhancing the Anaerobic Digestion of Corn Stalks Using Composite Microbial Pretreatment

( Xu Feng Yuan ),( Pei Pei Li ),( Hui Wang ),( Xiao Fen Wang ),( Xu Cheng ),( Zong Jun Cui ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.7

A composite microbial system (XDC-2) was used to pretreat and hydrolyze corn stalk to enhance anaerobic digestion. The results of pretreatment indicated that sCOD concentrations of hydrolysate were highest (8,233 mg/l) at the fifth day. XDC-2 efficiently degraded the corn stalk by nearly 45%, decreasing the cellulose content by 22.7% and the hemicellulose content by 74.1%. Total levels of volatile products peaked on the fifth day. The six major compounds present were ethanol (0.29 g/l), acetic acid (0.55 g/l), 1,2-ethanediol (0.49 g/l), propionic acid (0.15 g/l), butyric acid (0.22 g/l), and glycerine (2.48 g/l). The results of anaerobic digestion showed that corn stalks treated by XDC-2 produced 68.3% more total biogas and 87.9% more total methane than untreated controls. The technical digestion time for the treated corn stalks was 35.7% shorter than without treatment. The composite microbial system pretreatment could be a cost-effective and environmentally friendly microbial method for efficient biological conversion of corn stalk into bioenergy.