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Volume 6 Issue 6 (June 2019)

S.No. Title & Authors Page No View
1

Title : Design of the automatic warning device for running generator

Authors : Van Nam Bach, Duy Khanh Pham, Tuyet Hoa Thi Nguyen

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Abstract :

In this paper, the automatic warning devices for running generators in telecommunication stations are designed and implemented. These devices can be used for two cases: the generator is located inside Base Transceiver Station (BTS) and the generator is located far away from the BTS. These products have high applicabilities and competitive pricing. They are applied at BTSs of MobiFone Vietnamese telecom company.

1-4
2

Title : Auto-tuning controllers of a class of plants using gradient descent algorithm

Authors : Nguyen Trong Toan, Nguyen Nam Trung

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Abstract :

In industry, PID controller is widely used in the regulator of technology processes.  Many methods of designing conventional PID controllers do not work well for time-delayed linear, vague, and nonlinear systems. Therefore, PID parameter adjustment plays an important role. To solve this problem, many recent studies have focused on the development of auto-tuning controllers. Using the method of gradient descent algorithm to the parameter space of the controller whose coefficients developed by adaptive algorithms in this paper is adjusted automatically online to minimize the performance index without knowing the exact mathematical model of the plant. The simulation and test results on real plant are presented to illustrate the performance of the proposed auto-tuning PID controllers and a comparison with its traditional PID controller is made.

5-8
3

Title : Parameter distribution of crack growth rate in titanium alloy of manned submersible

Authors : Chunyang Zhao, Benyang Tu, Xuncheng Tu

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Abstract :

Based on the Paris and Walker theories of fatigue crack propagation in titanium alloys, a normal distribution model and a two-parameter weibull distribution model were established, and the results under different crack propagation models and different distribution characteristics were compared. The fatigue crack growth model was used to analyze the distribution characteristics of the uncertain material parameters n, m and C under the normal distribution and weibull distribution. Under the condition of crack propagation, the fitting stability of uncertain material parameters under normal distribution is better than weibull distribution with low dispersion.

9-14
4

Title : Comparative study of Joint Image Encryption and Compression Schemes: A Review

Authors : Behrooz Khadem, Reza Ahmadian

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Abstract :

With the development of imaging methods in wireless communications, enhancing the security and efficiency of image transfer requires image compression and encryption schemes. In conventional methods, encryption and compression are two separate processes, therefore an adversary can organize his attack more simply but if these two processes are combined, the output uncertainty increases. As a result, adversaries face more difficulties, and schemes will be more secure. This paper introduces a number of the most important criteria for the efficiency and security evaluation of joint image encryption and compression (JIEC) schemes. These criteria were then employed to compare the schemes. The comparison results were analysed to propose suggestions and strategies for future research to develop secure and efficient JIEC schemes.

15-20
5

Title : Simulation and Optimization Scheme of Hull Segment Manufacturing Planning Management

Authors : Li Jun

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Abstract :

Based on the modern system of shipbuilding planning management , taking the equipment of the hull workshop of a shipyard as the unit modeling, by combining the design of BOM, production plan, production process, production process and logistics with the Plant simulation, the genetic algorithm and process reengineering technology from the platform are used to optimize the production bottleneck and improve the utilization rate of equipment so that the plan can be balanced and continuous production.

21-23
6

Title : Interval Reliability Analysis of Titanium Alloy Fatigue

Authors : Benyang Tu, Chunyang Zhao

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Abstract :

The fatigue crack growth process of titanium alloy is affected by uncertain factors, which leads to uncertainty in the parameters of fatigue analysis, and it is necessary to carry out reliability analysis. Aiming at the limitations of the probabilistic reliability method on the high sample size and statistical information and the large computational complexity, a non-probabilistic reliability analysis method for fatigue crack growth interval of titanium alloy is proposed. The uncertain parameters in the Paris model are expressed as intervals, the interval non-probabilistic reliability index of fatigue crack propagation is defined and considered based on the fatigue life model characterizes, and uses the interval mathematics theory to solve the non-probabilistic reliability index. The example calculation results show that the non-probability reliability index decreases linearly from 99.231% to 90.846%, and the calculation result is more conservative than the probability reliability method, which is safer in engineering applications.

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7

Title : Global Behavior of the Fourth – Order Difference Equation

Authors : Mehmet Emre Erdogan

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Abstract :

In this article, the global asymptotic stability of the fourth order differential equation.

28-31
8

Title : A Study of Two-Wheel Vehicle Dynamics with Constant Speed

Authors : Der-Cherng Liaw, Chien-Chih Kuo, Yi-Tien Hung, Yi-Ming Hu

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Abstract :

This study explores the possible dynamical motions for a two-wheel vehicle with constant speed. Both of sufficient and necessary conditions for the existence of circular motion are obtained. Nine types of possible motion for two-wheel vehicle are then deduced from the obtained necessary condition. Numerical simulations are also given to demonstrate the analytical results and the usage of constant speed control for two-wheel vehicle’s motion.

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9

Title : Influence of different installation positions of keel on the resistance performance of pilot boat

Authors : Yu Xingpeng, Guan Yifeng

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Abstract :

Considering that the pilot vessel needs to be equipped with keel keel, pressure wave board and other attachments due to the ship's characteristics and improved navigation performance, these attachments have a greater impact on the total resistance of the hull. Since the bilge keel is widely used as the anti-rolling device for various types of seagoing vessels, its installation position has certain influence on the ship's resistance and anti-rolling performance. In this paper, the ship's resistance test and numerical calculation method are used to compare the resistance performance of the keel with different positions on a 16m pilot ship. That is, when the resistance is relatively small, the proper installation position of the keel is determined to achieve the best. Sailing effect. And verify the reliability of the calculation method and the specific impact of the keel on the total resistance performance.

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10

Title : The Wind Load Prediction of Asymmetric Semi-submersible Lifting Platform based on CFD

Authors : Zhenqiu Yao, Xiangyu Tang, Hongjie Ling

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Abstract :

In order to accurately predict the wind load of asymmetric marine structures, the 3d model of an asymmetric semi-submersible lifting platform was established by using SolidWorks software in this paper .The wind load based on 1:25 scale model was numerically predicted by using CFD software FINE/MARINE .The numerical simulation wind load is converted into the actual value through the similarity theory, and compared with the calculated value of CCS specification. The results show that The change trend of longitudinal force and transverse force of wind direction Angle of 0°~180° and 180°~360° basically remains the same, but the values are not the same due to the asymmetry of the platform. In addition ,  the standard calculation method cannot fully consider the effect of shading effect among the superstructure components, so the result is larger than the numerical simulation value. When the fluid meets the vertical windward surface of the superstructure, its velocity will plummet and flow into all directions. This paper provides an effective method for wind load prediction of asymmetric Marine structures and has certain reference value for the design and research of asymmetric semi-submersible lifting platform.

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11

Title : Code Smell Aware – Issue Prediction Model

Authors : S.Narasimhulu, CH.Lawrence Dheeraj, Dr.Madhu B.K

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Abstract :

Issues are the reasons for poor design. Previously we assess the impact of smells on code quality and it indicates their harmful impact on maintainability. In this paper we collect previous detections on issue-proneness to construct a specialized issue prediction model for code smell classes. Mainly focus on the involvement of a measure the severity of the code smells by adding it to the existing issue prediction model product based process based metrics, and comparing the results of the new model. The proposed model with the one of alternative approach which impacts metrics about the previous data of code smells in files. Identify that one proposed works usually better. However we observed the complementarities between the set of issues and smelly classes properly classified by the two models. On the basis of this result we assess a smell aware combined issue prediction model. We make obvious how such model classifies issue-prone code components with the harmonic mean of precision and recall.

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12

Title : Effect Of Agriculture Products On Inflation Rate, Exchange Rate And Interest Rate On Gross Domestic Product In Nigeria

Authors : Adekanbi Olukemi O.

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Abstract :

This paper effect of Agriculture products on  inflation rate, exchange rate and interest rate on gross domestic product in Nigeria is aim to identify the role of politics in National Development in Nigeria and determine if agriculture and politics really affect the National Development in Nigeria .Data was collected from abstract of Central Bank of Nigeria. Regression analysis is use to analyze the data .From the result of the analysis R-squared shows how close the data to the fitted regression line. The value of the R(0.735) 73.5% which implies that total variation in agricultural products is explain by explanatory variables. Based on the finding in this research we conclude that government should try to curb the inflation, to reduce the interest in order to improve on Agricultural products and Gross domestic Product in Nigeria.

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13

Title : Residual Stress Distribution in Butt Flat Welded Joint of High Strength Steel

Authors : Qianqian Jia, Gong Chen

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Abstract :

Modern ships and offshore engineering structures are usually welded by a large number of high-strength steel, and flat plate butt welding joint is the most common joint form in ship structures. These welded joints inevitably produce welding residual stress during welding process and have an impact on the fatigue strength of the whole structure, while high strength steel is more sensitive to welding residual stress. At the same time, due to long-term alternating loads caused by waves, waves and currents during service, the weld zone is prone to cracks, which will lead to fatigue fracture of the structure. In this paper, based on the theory of thermo-elastic-plastic and fracture mechanics, the residual stresses of welded joints of high strength steel plate are studied by programming with APDL language in ANSYS, and the distributions of residual stresses in different paths are obtained. The results show that the peak value of transverse residual tensile stress appears near the weld toe, while the stress far from the weld is relatively small. The research results in this paper can lay a foundation for the fatigue life study of ship welded structures.

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14

Title : A Design of RFID-Based Personnel Navigation Platform

Authors : Der-Cherng Liaw, Chien-Chih Kuo, Chiung-Ren Huang

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Abstract :

A simple personnel navigation platform is proposed in this study by using the radio frequency identification (RFID) technology and smart mobile device. In the design, the RFID devices play as locators for providing the location information and a smart mobile device acts as the trip guider for calculating the shortest routing path and giving the direction for the movement of personnel to the set desired destination. Experimental results on a selected campus environment are obtained to demonstrate the success of the proposed design.

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