A Research on Information Science Applied to Regional Tourism Cooperation Performance

Wei Min 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.3

Information science is related to data-intensive, man-machine communication and interactional information application system with main aim to provide for both tourism enterprises and tourism consumers with high quality service. At present, there are two modes of information science roles which is popular used in tourism enterprises: one is mainly used in the international network marketing for their products (service) based on the information websites, the other is linked to the tourism cooperation organization with the demand of tourism products(service) in their special mode. Information science applied to regional tourism cooperation development always plays a more and more important role in the growth of tourism economy and development of tourism industry. In addition, the mature application of information science can effectively reduce the loss of benefits related to regional tourism industry development, but also bring about the asymmetry of the game rulers for the main economic interests of regional tourism cooperation. The findings are the application of information science for regional tourism industry can reduce the cost of the exchange between cooperative organizations and tourism economy growth, and the information science application also improves their own values of the main participants among the regional tourism cooperation performance.

An automatic test platform to verify the security functions for secure WIA-PA wireless sensor networks

Wei, Min,Kim, Keecheon Taylor & Francis 2016 INTERNATIONAL JOURNAL OF DISTRIBUTED SENSOR NETWOR Vol.12 No.11

Intrusion Detection Scheme Using Traffic Prediction for Wireless Industrial Networks

Wei, Min,Kim, Kee-Cheon The Korea Institute of Information and Commucation 2012 Journal of communications and networks Vol.14 No.3

Detecting intrusion attacks accurately and rapidly in wireless networks is one of the most challenging security problems. Intrusion attacks of various types can be detected by the change in traffic flow that they induce. Wireless industrial networks based on the wireless networks for industrial automation-process automation (WIA-PA) standard use a superframe to schedule network communications. We propose an intrusion detection system for WIA-PA networks. After modeling and analyzing traffic flow data by time-sequence techniques, we propose a data traffic prediction model based on autoregressive moving average (ARMA) using the time series data. The model can quickly and precisely predict network traffic. We initialized the model with data traffic measurements taken by a 16-channel analyzer. Test results show that our scheme can effectively detect intrusion attacks, improve the overall network performance, and prolong the network lifetime.

A Research on Tourism Market Forecast and Evaluation Based on the Application of Linear Regression Model

Wei Min 보안공학연구지원센터 2014 International Journal of u- and e- Service, Scienc Vol.7 No.6

Tourism market forecast is an important tool to analyze the tourism market trends, to understand the trends of the needs of tourism market, as well as to forecast tourism demand in the direction of regional tourism development, by which the great significance for tourism product development strategy and market strategy could be carried on. The traditional prediction methods paid much more attention to the accuracy of the forecasts, ignoring the results of the feasibility of forecasting and predicting operability, which had made it difficult to predict the results of scientific testing. This paper created a scientific evaluation system for predictive value, both to ensure the accuracy, stability of the predicted value, and to ensure the feasibility of forecasting and predicting the results of operation based on simple linear regression applied to the forecasts of the tourism market. Therefore, the outcome of the tourism market forecasts in this paper can provide a scientific basis for the government to develop the policy for tourism industry.

Individual Channel Design-based Modeling and Analysis of Three Phase Grid-tied Inverter with Unbalanced Grid Impedance

Weimin Wu,Yun Li,Jiahao Liu,Frede Blaabjerg 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

Three-phase grid-tied inverters are usually designed to operate in symmetric grid impedance. In actual operations, due to the imbalanced loads, three-phase systems with significant single-phase loads, imbalanced power line impedance or the imbalanced short-circuit impedance of the three grid power transformer, the equivalent three-phase grid impedance is unbalanced. It is, consequently, important to develop an effective model and stability analysis method to address three-phase grid-tied inverter with unbalanced grid impedance. Traditionally, the stability of unbalanced system can be analyzed by harmonic linearization technique, however, the model derivation is complex and the controller parameters need second designing. This paper develops the system model in a multivariable frequency domain, by using the individual channel analysis and design (ICAD), simplifying the stability analysis of the unbalanced system. The detailed study on the three-phase LCL filter-based grid-tied inverter under the unbalanced grid impedance condition is presented. Simulation and experiment analysis are carried out on a 380 V/50 Hz/6 kW grid-tied inverter prototype.

Microbial communities inhabiting oil-contaminated soils from two major oilfields in Northern China: Implications for active petroleumdegrading capacity

Weimin Sun,Yiran Dong,Pin Gao,Meiyan Fu,Kaiwen Ta,Jiwei Li 한국미생물학회 2015 The journal of microbiology Vol.53 No.6

Although oilfields harbor a wide diversity of microorganisms with various metabolic potentials, our current knowledge about oil-degrading bacteria is limited because the vast majority of oil-degrading bacteria remain uncultured. In the present study, microbial communities in nine oil-contaminated soils collected from Daqing and Changqing, two of the largest oil fields in China, were characterized through highthroughput sequencing of 16S rRNA genes. Bacteria related to the phyla Proteobacteria and Actinobacteria were dominant in four and three samples, respectively. At the genus level, Alkanindiges, Arthrobacter, Pseudomonas, Mycobacterium, and Rhodococcus were frequently detected in nine soil samples. Many of the dominant genera were phylogenetically related to the known oil-degrading species. The correlation between physiochemical parameters within the microbial communities was also investigated. Canonical correspondence analysis revealed that soil moisture, nitrate, TOC, and pH had an important impact in shaping the microbial communities of the hydrocarbon-contaminated soil. This study provided an in-depth analysis of microbial communities in oilcontaminated soil and useful information for future bioremediation of oil contamination.

Effect of a TiN alkali diffusion barrier layer on the physical properties of Mo back electrodes for CIGS solar cell applications

Weimin Li,Xia Yan,Armin G. Aberle,Selvaraj Venkataraj 한국물리학회 2017 Current Applied Physics Vol.17 No.12

Cu(In,Ga)Se2 thin-film solar cells have attracted strong interest in the photovoltaic community due to their high efficiency and demonstrated industrial relevance. As the most commonly used back electrode for CIGS solar cells, molybdenum (Mo) is typically deposited on soda-lime glass substrates by magnetron sputtering. During the high-temperature CIGS absorber formation process step, alkali (Na) atoms diffuse from the soda-lime glass substrate into the CIGS absorber via the Mo contact, a process that is known to improve the cell efficiency. However, Na diffusion from soda-lime glass sheets is an uncontrolled process, which adds to batch-to-batch variations due to fluctuations in the glass quality and process parameters such as the CIGS formation temperature. Hence, a diffusion barrier layer between the glass substrate and the Mo back electrode is required to prevent this uncontrolled impurity diffusion. In this study, a TiN diffusion barrier layer is deposited by reactive magnetron sputtering of a metallic Ti target, using various N2 flow conditions. It is observed that the adhesion, microstructure, and morphology of the Mo films get significantly improved by the introduction of a TiN barrier layer, which in turn leads to better cell efficiencies. Hence, the TiN/Mo bilayer design developed in this work seems to be a good choice for enhancing the efficiency of CIGS solar cells.

Risk Factors of Colorectal Stricture Associated with Developing High-Grade Dysplasia or Cancer in Ulcerative Colitis: A Multicenter Long-term Follow-up Study

Weimin Xu,Wenjun Ding,Yubei Gu,Long Cui,Jie Zhong,Peng Du 거트앤리버 소화기연관학회협의회 2020 Gut and Liver Vol.14 No.5

Background/Aims: The risk factors of colorectal stricture associated with ulcerative colitis (UC) carcinogenesis in the long-term disease duration remain unclear. Methods: This study included all UC patients registered from a prospectively maintained database between June 1986 to July 2018. The demographic data, clinical features, and outcomes in patients with dysplasia and stricture were assessed using univariable analysis and multivariate logistic regression models. Results: A total of 246 eligible patients were included in the analysis. The median follow-up time was 13.0 years (interquartile range [IQR], 9.0 to 16.0). There were 35 cases (14.2%) of colorectal stricture. Patients with stricture had worse clinical outcomes. Stricture formation (odds ratio [OR], 9.350; 95% confidence interval [CI], 2.842 to 30.762), inflammatory polyps (OR, 5.464; 95% CI, 1.692 to 17.638), disease duration of more than 10 years (OR, 3.223; 95% CI, 1.040 to 9.985), and age >40 years at diagnosis (OR, 8.499; 95% CI, 1.903 to 37.956) were significantly associated with high-grade dysplasia or colorectal cancer. In addition, disease duration of more than 5 years (OR, 3.211; 95% CI, 1.168 to 8.881), moderated anemia (OR, 3.373; 95% CI, 1.472 to 7.731), and primary sclerosing cholangitis (OR, 5,842; 95% CI, 1.395 to 24.468) were contributing factors for the development of colorectal stricture. Conclusions: Colorectal stricture had the highest risk for malignant transformation. Earlier initiation of colonoscopic surveillance in UC patients with risk factors for stricture should be considered to prevent stricture formation and further malignant transformation.

Texture characteristics of a warm rolled 0.085 wt%-P interstitial free (IF) steel with and without lubrication

Weimin Guo,Zuocheng Wang,Na Xu,Ning Ding,Junbo Shi 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7

A 0.085 wt% P micro - alloyed and Ti-stabilized high strength IF (interstitial free) steel was warm rolled under two conditions: One with lubrication and the other without. The results show that lubrication has a significant effect on texture evolution during warm rolling and the subsequent annealing process. Without lubrication, severe shear deformation occurs in the surface layer, which results in recrystallization and the formation of a <110>//ND (normal direction) texture, while the central layer undergoes plane strain deformation and forms a weak <111>//ND deformation texture (typical of bcc iron). With good lubrication, both the surface and central layer experience plane strain deformation and a strong <111>//ND texture is normally formed. The warm rolling texture (which contains both recrystallized and deformed grains) has a profound effect on the subsequent annealing texture. The final textures influence the draw - ability of the plates, i.e. the r - value (r-value: The ratio of the true width strain to the true thickness strain in a sheet tensile test) and |Dr|-value (planar anisotropy coefficient). After annealing, the lubricated plates are characterized by a higher r - value (1.27) and a much lower |Dr|-value (0.075) than those rolled without lubrication (i.e. 0.96 for the r - value and 0.465 for the |Dr|-value).

Exploring metal-organic frameworks in electrochemistry by a bibliometric analysis

Weimin Ye,Wang Yang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-

Considering the great significance of metal organic framework (MOF) in the field of electrochemistry andthe knowledge gap in its development trend and research direction, this study collects 2,353 related publicationsindexed by Web of Science Core Collection published in the past 20 years. The analysis and mappingresults reveal key information such as time series, countries/region, institutions, publication sourcesand citations. Furthermore, this study identifies the development trend and research hotspot of MOF,including nine valuable topics such as hydrogen storage, battery/capacitor materials, electrocatalysisand MOF composite energy storage. The findings and suggestions of this study can provide helpful referenceand guidance for understanding the application and prospect of MOF in electrochemistry.