Vignan University

About: Vignan University is a education organization based out in Guntur, Andhra Pradesh, India. It is known for research contribution in the topics: Computer science & Control theory. The organization has 1138 authors who have published 1381 publications receiving 7798 citations.

LASSO-based feature selection and naïve Bayes classifier for crime prediction and its type

Abstract: For centuries, crime has been viewed as random because it is based on human behavior; even now, it incorporates an excessive number of factors for current machine learning models to forecast accurately. In this work, we tend to discuss the early crime prediction results from a model developed using the data from the Chicago crime dataset. In any case, with a superior execution future crime is to anticipated accurately, it is a testing assignment as a result of the increase in several crimes in present days. Therefore, the crime foreseeing method is foremost, and it identifies the future crimes and number of crimes are degraded. In this paper, we built up a model to anticipate future crime occurrences at a future time and also predict which type of crime may be happening in a given area. First, we analyze how certain crime features like given a date, time and some geologically important relevant features such as latitude and longitude. Second, we discuss several analytics techniques we used to find meaning in our data, such as LASSO feature selection analysis, classification models like naive Bayes and SVM. Finally, we select the best model for foreseeing crime type and seriousness of the crime for giving different features.

Purification and characterization of fibrinolytic enzyme from a bacterium isolated from soil.

Abstract: A novel extracellular enzyme with strong fibrinolytic activity, produced by Bacillus tequilensis, which was isolated from the soil of Zhuhai City (China) was purified and characterized. The enzyme was secreted by cultured B. tequilensis in solid state and purified at a high efficiency using the combination of salting out, ion exchange chromatography, and size exclusion chromatography. The enzyme was estimated to have a molecular weight of approximately 27 kDa, pI of 8.9 ± 0.1, to stable at pH 5.0–12.0 and up to 50 °C; the optimum pH and temperature are 10.5 and 45 °C (2373.59 ± 54.81 U/mg), respectively. The fibrinolytic activity was enhanced by K+, Na+, Mg2+, Mn2+, Ca2+, and Ba2+ and inhibited by Cu2+, Zn2+, and Fe3+. Moreover, the activity was slightly enhanced by PMSF and EDTA at low concentrations and inhibited by β-mercaptoethanol. The N-terminal amino acid sequence is AQSVPYGISQI. The enzyme has a higher enzymatic activity than most other fibrinolytic enzymes. The high thermal stability indicated that it is easy to preserve and could be activated under high-temperature conditions.

Corrosion Inhibitors Behaviour on Reinforced Concrete—A Review

Abstract: Corrosion is one of the major deterioration problems in the reinforced concrete industry. Approximately, more than 18 billion dollars per year is incurred on the repair and rehabilitation of corroded structures throughout the world. The occurrence of corrosion is because of chloride particles present in the atmosphere and carbonation process in concrete. Reinforcement corrosion is an electrochemical process that defines the concentrations between variations of dissolved ions in the concrete. This paper focuses on the corrosion inhibitors which are used as migration corrosion inhibitors (applied on the surface) of the concrete specimen and admixed into the concretes. An in-depth study on the mechanism of corrosion and the effect of migrated, cathodic and anodic on reinforced concrete has been performed. A critical review of the causes of the corrosion as well as preventions by using organic, inorganic and natural inhibitors is carried out.