Sentiment classification with concept drift and imbalanced class distributions

Document-level sentiment classification aims to automate the task of classifying a textual review, which is given on a single topic, as expressing a positive or negative sentiment. In general, people express their opinions towards an entity based on their characteristics which may change over time. User‘s opinions are changed due to evolution of target entities over time. However, the existing sentiment classification approaches did not considered the evolution of User‘s opinions. They assumed that instances are independent, identically distributed and generated from a stationary distribution, while generated from a stream distribution. They used the static classification model that builds a classifier using a training set without considering the time that reviews are posted. However, time may be very useful as an important feature for classification task. In this paper, a stream sentiment classification framework is proposed to deal with concept drift and imbalanced data distribution using ensemble learning and instance selection methods. The experimental results show the effectiveness of the proposed method in compared with static sentiment classification

Comparative study of the presence of latex and polychloroprene in the behavior of sintered powder EPDMCR, ethylene-propylenediene-monomer crumb rubber

In this work, the mechanical behavior of sintered waste material of ethylene-propylene-diene-monomer crumb rubber (EPDMCR) is analyzed, optimizing the temperature and compression pressure. The results obtained showed that an increase in temperature and compression pressure gives a significant improvement in the mechanical properties of the material. We later mixed the EPDMCR particles with different percentages of adhesives with the aim of further improving the mechanical performance obtained from the sintered particles. The adhesives used in this study were latex and polychloroprene, and the optimum mechanical performance obtained came from mixes with polychloroprene, using a mix with 50% adhesive. The study was concluded with an analysis of images of the material using a scanning electron microscope (SEM), in order to observe the EPDMCR-adhesive interaction.Crespo Amorós, JE.; Parres, F.; Nadal Gisbert, AV. (2012). Comparative study of the presence of latex and polychloroprene in the behavior of sintered powder EPDMCR, ethylene-propylenediene-monomer crumb rubber. Journal of Elastomers and Plastics. 44(2):127-144. doi:10.1177/0095244311418318S127144442Osman, H., Ismail, H., & Mariatti, M. (2007). The Effect of Recycled Newspaper Content and Size on the Properties of Polypropylene (PP)/Natural Rubber (NR) Composites. Polymer-Plastics Technology and Engineering, 47(1), 23-29. doi:10.1080/03602550701575961Crespo, J. E., Parres, F., & Nadal, A. (2009). Mechanical behavior analysis of sintered products of natural rubber crumb rubber (NRCR) using adhesives. Materialwissenschaft und Werkstofftechnik, 40(3), 211-217. doi:10.1002/mawe.200900429Setua, D. K., & Gupta, Y. N. (2007). On the use of micro thermal analysis to characterize compatibility of nitrile rubber blends. Thermochimica Acta, 462(1-2), 32-37. doi:10.1016/j.tca.2007.06.004Nakason, C., Kaesaman, A., Samoh, Z., Homsin, S., & Kiatkamjornwong, S. (2002). Rheological properties of maleated natural rubber and natural rubber blends. Polymer Testing, 21(4), 449-455. doi:10.1016/s0142-9418(01)00109-xJincheng, W., Yuehui, C., & Jihu, W. (2005). Novel Reinforcing Filler: Application to Natural Rubber (NR) System. Journal of Elastomers & Plastics, 37(2), 169-180. doi:10.1177/0095244305052010Sutanto, P., Picchioni, F., Janssen, L. P. B. M., Dijkhuis, K. A. J., Dierkes, W. K., & Noordermeer, J. W. M. (2006). State of the Art: Recycling of EPDM Rubber Vulcanizates. International Polymer Processing, 21(2), 211-217. doi:10.3139/217.1906Jacob, C., Bhowmick, A. K., De, P. P., & De, S. K. (2003). Utilization of Powdered EPDM Scrap in EPDM Compound. Rubber Chemistry and Technology, 76(1), 36-59. doi:10.5254/1.3547740Jacob, C., Bhattacharya, A. K., Bhowmick, A. K., De, P. P., & De, S. K. (2003). Recycling of ethylene propylene diene monomer (EPDM) waste. III. Processability of EPDM rubber compound containing ground EPDM vulcanizates. Journal of Applied Polymer Science, 87(14), 2204-2215. doi:10.1002/app.11474Jacob, C., Bhowmick, A. K., De, P. P., & De, S. K. (2002). Studies on ground EPDM vulcanisate as filler in window seal formulation. Plastics, Rubber and Composites, 31(5), 212-219. doi:10.1179/146580102225003029Jacob, C., De, P. P., Bhowmick, A. K., & De, S. K. (2001). Recycling of EPDM waste. II. Replacement of virgin rubber by ground EPDM vulcanizate in EPDM/PP thermoplastic elastomeric composition. Journal of Applied Polymer Science, 82(13), 3304-3312. doi:10.1002/app.2189Jacob, C., De, P. P., Bhowmick, A. K., & De, S. K. (2001). Recycling of EPDM waste. I. Effect of ground EPDM vulcanizate on properties of EPDM rubber. Journal of Applied Polymer Science, 82(13), 3293-3303. doi:10.1002/app.2188Grigoryeva, O. P., Fainleib, A. M., Tolstov, A. L., Starostenko, O. M., Lievana, E., & Karger-Kocsis, J. (2004). Thermoplastic elastomers based on recycled high-density polyethylene, ethylene-propylene-diene monomer rubber, and ground tire rubber. Journal of Applied Polymer Science, 95(3), 659-671. doi:10.1002/app.21177Mathew, G. (2003). Journal of Materials Science, 38(11), 2469-2481. doi:10.1023/a:1023965420749Morin, J. E., Williams, D. E., & Farris, R. J. (2002). A Novel Method to Recycle Scrap Tires: High-Pressure High-Temperature Sintering. Rubber Chemistry and Technology, 75(5), 955-968. doi:10.5254/1.3547695Rajeev, R. S., & De, S. K. (2004). Thermoplastic Elastomers Based on Waste Rubber and Plastics. Rubber Chemistry and Technology, 77(3), 569-578. doi:10.5254/1.3547837Yehia, A. A., Mull, M. A., Ismail, M. N., Hefny, Y. A., & Abdel-Bary, E. M. (2004). Effect of chemically modified waste rubber powder as a filler in natural rubber vulcanizates. Journal of Applied Polymer Science, 93(1), 30-36. doi:10.1002/app.20349Zhang, K., Shen, H., Zhang, X., Lan, R., & Chen, H. (2009). Preparation and Properties of a Waterborne Contact Adhesive Based on Polychloroprene Latex and Styrene-Acrylate Emulsion Blend. Journal of Adhesion Science and Technology, 23(1), 163-175. doi:10.1163/156856108x344658Park, S. W., Kim, B. C., & Lee, D. G. (2009). Tensile Strength of Joints Bonded With a Nano-particle-Reinforced Adhesive. Journal of Adhesion Science and Technology, 23(1), 95-113. doi:10.1163/156856108x344063Buchman, A., Dodiuk-Kenig, H., Dotan, A., Tenne, R., & Kenig, S. (2009). Toughening of Epoxy Adhesives by Nanoparticles. Journal of Adhesion Science and Technology, 23(5), 753-768. doi:10.1163/156856108x379209Likozar, B., & Krajnc, M. (2008). A study of heat transfer during molding of elastomers. Chemical Engineering Science, 63(12), 3181-3192. doi:10.1016/j.ces.2008.03.031Yan, L., Kou, K., Ji, T., Liang, G., & Ha, E. (2007). Application of a new modified epoxy adhesive for bonding fluorine rubber to metal. Journal of Adhesion Science and Technology, 21(15), 1483-1496. doi:10.1163/156856107782844792Smitthipong, W., Nardin, M., Schultz, J., & Suchiva, K. (2007). Adhesion and self-adhesion of rubbers, crosslinked by electron beam irradiation. International Journal of Adhesion and Adhesives, 27(5), 352-357. doi:10.1016/j.ijadhadh.2006.09.010Colom, X., Carrillo, F., & Cañavate, J. (2007). Composites reinforced with reused tyres: Surface oxidant treatment to improve the interfacial compatibility. Composites Part A: Applied Science and Manufacturing, 38(1), 44-50. doi:10.1016/j.compositesa.2006.01.022Liu, L., Luo, Y., Jia, D., Fu, W., & Guo, B. (2006). Structure and Properties of Natural Rubber-Organoclay Nanocomposites Prepared by Grafting and Intercalating Method in Latex. Journal of Elastomers & Plastics, 38(2), 147-161. doi:10.1177/0095244306057425Budrugeac, P. (2001). Thermal degradation of glass reinforced epoxy resin and polychloroprene rubber: the correlation of kinetic parameters of isothermal accelerated aging with those obtained from non-isothermal data. Polymer Degradation and Stability, 74(1), 125-132. doi:10.1016/s0141-3910(01)00112-4Arayasantiparb, D., McKnight, S., & Libera, M. (2001). Compositional variation within the epoxy/adherend interphase. Journal of Adhesion Science and Technology, 15(12), 1463-1484. doi:10.1163/156856101753213312Kim, J. I., Ryu, S. H., & Chang, Y. W. (2000). Mechanical and dynamic mechanical properties of waste rubber powder/HDPE composite. Journal of Applied Polymer Science, 77(12), 2595-2602. doi:10.1002/1097-4628(20000919)77:123.0.co;2-cCepeda-Jiménez, C. M., Pastor-blas, M. M., Ferrándiz-Gómez, T. P., & Martín-Martínez, J. M. (2000). Surface Characterization of Vulcanized Rubber Treated with Sulfuric Acid and its Adhesion to Polyurethane Adhesive. The Journal of Adhesion, 73(2-3), 135-160. doi:10.1080/00218460008029303Sutanto, P., Picchioni, F., Janssen, L. P. B. M., Dijkhuis, K. A. J., Dierkes, W. K., & Noordermeer, J. W. M. (2006). EPDM rubber reclaim from devulcanized EPDM. Journal of Applied Polymer Science, 102(6), 5948-5957. doi:10.1002/app.25153Yun, J., Yashin, V. V., & Isayev, A. I. (2003). Ultrasonic devulcanization of carbon black-filled ethylene propylene diene monomer rubber. Journal of Applied Polymer Science, 91(3), 1646-1656. doi:10.1002/app.13320Yun, J., & Isayev, A. I. (2003). Recycling of roofing membrane rubber by ultrasonic devulcanization. Polymer Engineering & Science, 43(4), 809-821. doi:10.1002/pen.10067Pandey, K. ., Setua, D. ., & Mathur, G. . (2003). Material behaviour. Polymer Testing, 22(3), 353-359. doi:10.1016/s0142-9418(02)00112-5Setua, D. K. (1985). Scanning electron microscopy studies on thermo-oxidative ageing of polychloroprene rubber. 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Combined Use of Sensitivity Analysis and Hybrid Wavelet-PSO- ANFIS to Improve Dynamic Performance of DFIG-Based Wind Generation

In the past few decades, increasing growth of wind power plants causes different problems for the power quality in the grid. Normal and transient impacts of these units on the power grid clearly indicate the need to improve the quality of the electricity generated by them in the design of such systems. Improving the efficiency of the large-scale wind system is dependent on the control parameters. The main contribution of this study is to propose a sensitivity analysis approach integrated with a novel hybrid approach combining wavelet transform, particle swarm optimization and an Adaptive-Network-based Fuzzy Inference System (ANFIS) known as Wavelet-ANFIS-PSO to acquire the optimal control of Doubly-Fed Induction Generators (DFIG) based wind generation. In order to mitigate the optimization complexity, sensitivity analysis is offered to identify the Unified Dominate Control Parameters (UDCP) rather than optimization of all parameters. The robustness of the proposed approach in finding optimal parameters, and consequently achieve a high dynamic performance is confirmed on two area power system under different operating conditions

Estimating the carrying capacity of tourism and the necessity of forest stands management (Case study: Darkesh forest, North Khorasan, Iran)

This study focuses on the carrying capacity estimation for Darkesh forest in Northeast Iran. Four factors were used for estimating the carrying capacity including tourist flows, size of the area, optimum space available for each tourist, and visiting time. Results showed that the physical carrying capacity was 2727 ha or 165 visitors day-1, while the real carrying capacity was 2719 ha or 132 visitors day-1. An average of 200 tourists per day visited the park during 2015, which was much higher than the estimated carrying capacity. Development of recreational uses in the study area would also affect the forest production and other benefits in long term. This study suggested that to prevent intense use of the forest area, a plan must be developed. On the other hand, the number of visitors has to be precisely calculated in order to maintain healthy forest stands and to secure the ecological benefits for future generations

Social media usage among wine tourism DMOs

Social media is an important tool for tourism destination promotion. The usage and the contents published on these platforms have an important role in visitors’ decision-making process. Information and communication technologies are changing DMOs’ markets and communication paradigm, since they allow the interaction between these organizations, visitors, and stakeholders. Therefore, social media are increasing their relevance on DMOs’ marketing strategies. This purpose of this study is to analyze comparatively social media platforms’ usage by six wine tourism DMOs. The results were provided by the analysis of secondary data available on these platforms and DMOs posts on the four most popular social media platforms to tourism industry: Facebook, Instagram, Twitter, and YouTube. Results indicate that DMOs use their official accounts on these platforms on different ways. This study also reveals that Facebook is more interactive than other platforms, and YouTube achieves less engagement levels.info:eu-repo/semantics/publishedVersio

Neurology

Contains reports on six research projects.U. S. Public Health Service (B-3055-4, B-3090-4, MH-06175-02)U. S. Air Force (AF49(638)-1313)U.S. Navy. Office of Naval Research (Nonr-1841(70)

Pecking order theory versus trade-off theory : are service SMEs’ capital structure decisions different?

This paper seeks to analyse if the capital structure decisions of service small and medium-sized enterprises (SMEs) are different from those of other types of firm. To do so, we consider four research samples: (i) 610 service SMEs; (ii) 126 service large firms; (iii) 679 manufacturing and construction SMEs; and (iv) 132 manufacturing and construction large firms. Using the two-step estimation method, the empirical evidence obtained in this study shows that the capital structure decisions of service SMEs are different from those of other types of firm. Service SMEs’ capital structure decisions are closer to the assumptions of Pecking Order Theory and further removed from those of Trade-Off Theory compared with the case of other types of firm