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Rapid growth of Internet and availability of user reviews on the web for any product has provided a need for an effective system to analyze the web reviews. Such reviews are useful to some extent, promising both the customers and product manufacturers. For any popular product, the number of reviews can be in hundreds or even thousands. This creates difficulty for a customer to analyze them and make important decisions on whether to purchase the product or to not. Mining such product reviews or opinions is termed as opinion mining which is broadly classified into two main categories namely facts and opinions. Though there are several approaches for opinion mining, there remains a challenge to decide on the recommendation provided by the system. In this paper, we analyze the basics of opinion mining, challenges, pros & cons of past opinion mining systems and provide some directions for the future research work, focusing on the challenges and issues.

This paper presents, investigation on PQ based problems using DVR. Dynamic Voltage Restorer (DVR) is a series connected flexible AC Transmission System controller used to compensate PQ problems like voltage swells and sags. A DVR used to compensate deep PQ problems and harmonics. The control of DVR has been proposed by using dqo based Pseudo-inverse and Magnitude Conversions transformation for mitigation of PQ problems in power systems. The proposed article explains the load flow dqo transformation algorithm working for mitigation of PQ problems and used for increase power quality in efficient. The control of DVR was achieved by using proposed algorithm. Here the device used to the load with negligible effect on PQ compensation capability. The high oriented graphical representations are facilitates and topology was modeled, simulated using MAT Lab/Sim power systems.

Refactoring is a technique to make a computer program more readable and maintainable. A bad smell is an indication of some setback in the code, which requires refactoring to deal with. Many tools are available for detection and removal of these code smells. These tools vary greatly in detection methodologies and acquire different competencies. In this work, we studied different code smell detection tools minutely and try to comprehend our analysis by forming a comparative of their features and working scenario. We also extracted some suggestions on the bases of variations found in the results of both detection tools.

This experiment study aimed to investigate the physical, chemical and mechanical properties of fly ash cement concrete for road construction. Research has shown that 30% of fly ash and 70% of cement has a superior performance. Characteristics compared to the standard requirements conformable code. Moreover, the use of fly ash would result in reduction of the cost of materials in construction and the reduction of greenhouse gas emission. High strength of concrete can be made and the incorporation of admixture or substitute to improve the properties of concrete. Test result of specimens indicates the workability, and bonding strength of properties, and different reaction when the water ratio a change its content. Slump test having an appropriate workable mixing the slump of a concrete, gave sufficient compressive strength. Test results of 14 days specimens having different results but it only treated when it downs to minimum level of required conformable code.

Steganography is the skill of communicating secret data by embedding it into multimedia carriers like image, audio, videos. The ultimate goal here is to mask the very existence of the embedded data. Even though the term Steganography has been known for thousands of years, its digital form came about only lately and research was make stronger after the depressing event on 11th Sep 2001(Twin towers). In contrast to Steganography, Steganalysis is the official counter attack science used for detects and or estimate the hidden information with little knowledge of Steganography algorithms. Steganography’s ultimate intentions are robustness, undetectability, and size of the hidden data. This paper provides a survey review and analysis of the different existing methods of steganography along with some common standards and guidelines drawn from the literature. This paper completes with some recommendations and advantages of Steganography techniques and current research scopes.

This paper describes the simulation of arm movements of a stepper motor controlled pick-and-place robot using the mathematical model of a stepper motor. The model includes: a) a model of the stepper model driver board, b) a model of the hybrid stepper motor and load combination, and c) the interconnection of the two models which is used to simulate the motions of the base, shoulder, elbow, and wrist (pitch) motions of the pick-and-place robot. The model is simulated using Simulink and the results of angular displacement from the simulation and actual measurements show good uniformity.

This study is an extension of our last researches about the detection of transition zones based on multiresolution spectral analysis (MRS). In this paper we present the fourth step for the realization of an automatic system for Tunisian Dialect segmentation and analysis. The MRS is calculated over several Fast Fourier Transforms (FFT) of different length. It can provide a higher temporal accuracy in the upper spectral region and a better frequency resolution in the lower spectral range. We showcase the importance of this tool by attempt- ing to an automatic transition zones detection by calculating the Interquartile Range (IQR) of all frames of the MRS FFT. We applied our Visual Assistance of Speech Processing (VASP) System to a corpus. This corpus was in Tunisian Dialect pronounced by tunisian speakers. The analysis of the obtained results shows that the automatic detection of tran- sition zones based on MRS provides better results compared to classical spectral analysis of the corpora used.

The hydrated gel hyaluronic acid (HA) comprises repeating units of glucuronic acid and N- acetylglucosamine. HA production has a lot of significance in the present day scenario owing to its clinical applications. Fermentative optimization is carried out in two steps. Statistical optimization of media components for the production of HA using Taguchi and Response Surface Methodology (RSM) was studied using a mutant strain Streptococcus zooepidemicus 3523-7. Initial optimization was carried out using L27 - orthogonal array. The significance of each factor with respect to HA production was identified using Taguchi design (Glucose, Yeast extract, K2HPO4, NaH2PO4, NaCl, NH4Cl, 1M MgSO4 and Trace metal mix (TMM)) and the productivity was increased 1.34 folds (738 to 988 mg/L) over native production medium. The outcome of Taguchi results indicates the glucose, yeast extract, K2HPO4 and NH4Cl are most influencing factors in the production of HA. Final optimization was carried out using RSM (Central Composite Rotatable Design) and the production was significantly enhanced to 1.4 folds (988 to 1386 mg/L). For the first time statistical optimization was carried out using a mutant strain Streptococcus zooepidemicus 3523-7 and high yield (1386 mg/L) of HA was achieved.