Статьи журнала - International Journal of Engineering and Manufacturing
Все статьи: 484
Smartphone Controlled Spy Robot with Video Transmission and Object Collector
Статья научная
Android, an operating system developed by Google for smartphones, tablets and such type of touchscreen phones. Android app is a software running on Android platform. Typically an app is designed for specific purpose on Android platform such as smartphones and tablets. In this work a designing and implementing process of an Android based spy robot is described. An Android based application, RC Bluetooth controller is used to control in this spy robot. This robot can be controlled with the help an app of Android phones. Arduino based microcontroller is used for instruction processing and giving proper instructions. Bluetooth technology is used to interface between Arduino and Android. A hand for collecting and holding objects and a camera for live video steaming is used to observe any object & movement of robot. This robot can move to any place and perform smartly within Bluetooth network range.
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Software Evolution of Next.js and Angular
Статья научная
Software evolution is the process of updating a software from it’s initial phase incorporating updates taken from the users. E-type software takes feedback and requirements from the users and updates the software accordingly. In the 70’s, Lehman proposed some laws of software evolution, which are still considered as the standards of measuring software evolution. Now-a-days, E-type softwares are getting very popular as users now use softwares by giving feedback. We are measuring Lehman’s laws of software evolution for two E-type softwares, Next.js and Angular. By downloading the source codes from github repositories, we analysed the source codes and evaluated if the softwares follow Lehman’s Laws of Software Evolution or not. This analysis completes the research which aims at measuring if the softwares evolve by maintaining Lehman’s Laws.
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Статья научная
Rickshaw is the most common three wheeler in Bangladesh. Easy availability, less fare, openness in structure etc. have made this very popular vehicle for short distance travel purposes. Two types of Rickshaws are seen plying on the road, one is manual peddling type another is an electric motorized type which needs to be charged using electricity from the national grid. Each type possess its own disadvantages. The first one need to be pulled by a man, which can be very hard & laborious for the pullers. The second one needs electricity for charging purposes which is a burden on the national grid. In this paper, we tried to represent a new model of Rickshaw by mitigating the disadvantages of both types. The features, working mechanisms, structure, components etc. of the Solar Powered Rickshaw is discussed briefly with the necessary figures in this paper. The main objective of this paper is to relieve Rickshaw pullers from this kind of laborious job by using Solar Power Rickshaw (SPR) and help improving the power crisis in Bangladesh.
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Spiral flows at the cardiovascular system as the experimental base of new cardiac-gadgets design
Статья научная
The results of studies of the functional mechanodynamics of the arteries of the cardiovascular system are presented. Methods of mathematical neural computer modeling, developed by the authors, were reproduced the features of blood flow in statics and dynamics, taking into account the spiral laying of vessels smooth muscle with the transfer of its relief through a thin endothelial membrane lining the inner surface. It is shown that the the nature of the blood flow significantly differs with the both quantitative and qualitative characteristics from the blood flow without regard to the spiral endothelial relief repeating helical laying of smooth shell. The developed methods of neurocomputer modeling allow reconstruct and detect events to recreate the picture of the functioning of living bio tissue. Based on the obtained results and neural networks modeling, a new paradigm for the design of implantable cardiac-gadgets purposed.
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Stability Analysis of Slope Based on Finite Element Method
Статья научная
Based on the finite element software as calculation tool, Mohr-Coulomb yield criterion and Drucker-Prager yield criterion were converted to equivalent area circle yield criterion, the elastic-plastic large deformation finite element method (FEM) was adopted, at the same time strength reduction technology combined with convergence criterion, catastrophe criterion and plastic zone penetrability criterion was used, and the problem of 2-D slope stability was analysed. Then based on finite element reduction strength method and three criterions, the homogeneous slope safety factors were calculated. The results showed that equivalent area circle D - P yield criterion was suitable for slope stability analysis and that strength reduction technology could be applied in simple homogeneous side slope stability analysis.
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Статья научная
We propose a stage structure predator-prey model with a partially dependent predator and prey conservation. It is taken that the environment has been divided into two disjoint regions, namely, unreserved and reserved areas, where a predator is not allowed to enter the latter. The first model describes four species: prey refuge (prey in the reserved zone), prey in the unreserved zone, mature and immature predators. The predator is partially dependent on the prey in the unprotected area. The existence of ecological equilibria and their local and global stability is investigated. By using the Lyapunov theorem, sufficient conditions on the global stability of the equilibriums are obtained. Some numerical simulations show the viability of our results. The results show that the reserved area has a stabilizing impact on the stage structure predator-prey model.
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Статья научная
A SMC for the ball-on-sphere system was designed in this work. The mathematical system’s model was first derived and a SMC was designed. Then, Lyapunov’s method was used to test for the convergence on the sliding surface, and convergence of the system's states to the sliding surface was guaranteed. To reduce chattering, a super twisting SMC was designed. A controller that is linear was first given to the system and the simulation results showed that, while there is disturbance, achieving origin’s asymptotic stability is not viable. A SMC was then applied next, while there is disturbance, origin’s asymptotic stability was attained in finite-time. Then a 2nd order SMC was applied and the results showed faster origin’s asymptotic stability in finite time. Therefore, the real effect of applying a 2nd order SMC is faster asymptotic stability of the origin1. To reduce chattering, a ST SMC was applied and the chattering was observed to be reduced efficiently.
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Start-up failures due to Quality Failures
Статья научная
Software start-ups are fundamentally different from traditional software development firms and boutique software services enterprises of all sizes. They develop software products with strict time and resource constraints and are focused on beating competitors to the market. They fail fast and often pivot their business models several times in their lifetimes. Their approach to designing, developing, testing, and shipping software products differs vastly from the established software engineering principles that emerged during the field’s earlier decades. One such principle is Software Quality Assurance. Start-ups tend to do away with procedures that ensure that their products are of the utmost quality. Instead, they focus on shipping their products to market as fast as possible, testing these products vis-a-vis real-life customers and use-cases, and eventually improving these products, repeating the process several times over. We hypothesize that this reluctance to adhere to software quality assurance principles can have adverse effects on the health of start-ups or their products. This paper investigates this hypothesis through over 20 questions presented to CEOs, CTOs, Technical Leads, and Product Managers of several start-ups. These questions focus on start-ups’ motivations, their levels of understanding and appreciation of software quality assurance principles, and the limitations they face due to time and resource constraints. Our research’s results indicate the surveyed start-ups’ problems are partially due to the absence of robust software quality assurance practices within their processes.
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Statics simulation of the buffer wastewater neutralization process
Статья научная
The pH value is a very common chemical measurement and is an indicator of water quality. For dilute solutions of strong acids and bases, the pH is related to their concentration, and therefore, it’s related to the required for neutralization dose of the reagent, a clear dependence. In this case, the pH value is quite reliable parameter to control the process of neutralization. However, when the wastewater components that have buffer properties, for example, mixtures of weak acids and bases and their salts in mixture with strong acids are present, the neutralization process is described already by a group of characteristics. In the last case, traditional automatic systems cannot cope with the qualitative pH regulation. The article is devoted to the mathematical statics model of a neutralization buffer of wastewater process development. Based on the formulated assumptions, this process was divided into stages. After considering the characteristics of each stage the mathematical model of the process was obtained. The theoretical research results are specified in the developed calculation algorithm of the total reagent dose which is required to neutralize the wastewater, which have strong and weak acids in its composition. The theoretical and practical research results were approbated in the design of automatic control system of the buffer wastewater neutralization process in the enterprise of low-waste technology.
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Step Motor Mode for Automobile Idle Adjuster
Статья научная
Automobile idle adjuster is mainly used to make the idle speed of engine be constant and reduce oil cost when automobile is in idle moving, which can increase idle speed and prevent engine from stopping. Automobile idle adjuster controls idle speed by controlling the mode of throttle valve channel. It also can increase idle speed automatically when the engine load is bigger. This can be happen when the air-conditioning unit, power steering or torque converter is introduced. In this paper, we mainly studied the effect, structure, working principle about step motor mode fro automobile idle adjuster. We also introduced the improvement about traditional automobile idle adjuster.
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Статья научная
The paper is devoted to the realization of scientific and technical ideas and knowledge in practice, and to the study and the structural analysis of the content of their transformation processes into innovation in technoparks. We show that the innovation processes are required to be analyzed and classified; their stages, as well as the system of indicators need to be improved. The need for the implementation of scientific and technological ideas is commented and considered as a process of innovation. The structure of the innovation process, its features and of stages are explained and classified in technoparks. The factors that affect the innovation processes are investigated; and the processes automation issues are considered, as well. Organizational and economical mechanisms used for the implementation of the innovation processes are analyzed and a number of recommendations are developed to improve the process.
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Structural Damage Identification Based on the Modal Data Change
Статья научная
This paper presents a method for structural damage identification based on the modal data change before and after the occurrence of damage. In this method, it is assumed that the reduction of structural stiffness due to damage as the summation of each elemental stiffness matrix multiplied by a damage coefficient. And then, the damage coefficient (damage extent) can be solved adversely from the vibration equation. Furthermore, the modal assurance criterion (MAC) is introduced to check the correlation of mode shapes between the damaged and the undamaged structure. An advantage of employing the MAC is that it can analyze the sensitivity of mode shapes to damage. To demonstrate the capability of the proposed method, an example of a six-span planar truss beam is used to verify the present method numerically. Results indicate that the proposed method is effective in locating single or multiple damage locations and quantifying damage extent in the truss structure.
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Studies on the performance of a GaInP/GaAs tandem solar cell at elevated temperatures
Статья научная
In this paper theoretical studies have been performed on a multijunction GaInP/GaAs based tandem solar cell. The top GaInP cell and the bottom GaAs cell were investigated separately. At an operating temperature of 300K, the current matching condition is fulfilled when the top cell and bottom cell base doping concentration and thickness are set to 5x1015/cm3, 1µm, and 2x1017/cm3, 0.127µm respectively. For the purpose of the investigation, a wide operating temperature range was chosen from 25ºC to 100ºC. The optimized tandem solar cell structure having a thickness of 1.847 microns is found to have VOC=2.2996V, ISC=0.0136Amp/cm2, FF=87.61% and ɳ=27.4% under AM1.5G one sun illumination. Studies have also revealed that when the cells are analyzed separately the current mismatch is less significant at low temperatures with the difference becoming notable at higher temperatures. Simulations of the solar cell were performed using PC1D.
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Study of Image Enhancement Techniques in Image Processing: A Review
Статья научная
Image denoising plays extremely important role in digital image processing. The primary objective of this paper is to explore highlighted challenges of the image filtering techniques. The comprehensive study has evidently shown that the one of most challenging issue in image filtering is edge preserving while removing the noise. Because edges deliver the most important information to the human visual system. This paper has compared different recent image filtering methods based upon certain factors. The comparisons have shown that the noise reduction using wavelet coefficients based on OMP has quite effective improvements over available methods. Challenging issue in image filtering technique is removing the multiplicative noise and high density of noises is still found.
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Study of PET Fiber Concrete in Beam-Column Joint under Cyclic Loading Using Finite Element Analysis
Статья научная
The failure behavior of beam-to-column connections can be minimized or avoided to some extent by using PET waste fibers. With the change of composition, different seismic performances of concrete joints can be adjusted. FEM analysis was performed in ABAQUS software to compare the performance of concrete beam-to-column connections reinforced with conventional concrete fibers and waste PET under cyclic loading. The concrete mix is designed to achieve a concrete grade of M25. Seven figures of the external beam-to-column connections were modeled as a quarter of the architectural prototype. The first joint is conventional concrete and designed according to IS 1893 (Part 1):2022 and the reinforcement in the joint part are specified according to the ductility requirements of IS 13920:2016. Six other samples were designed to contain different PET waste fibers (0.25% to 1.50%) in the seam area. Beam-to-column connections have 0.75% to 1.25% PET fiber inclusions that have better performance in terms of strength, load-carrying capacity, energy dissipation capacity, joint shear strength, and ductility in the joint area. Incorporating PET waste fibers into concrete can provide the best solution for waste management, and also has the potential to reduce the cost of reinforced concrete by 15%-20% holds economic significance, and concrete with PET waste fibers indeed demonstrates better seismic performance, and could lead to increased safety and longevity of structures in seismic-prone areas. This suggests that experimental work or studies might have explored how these fibers affect the concrete's properties, strength, durability, and other characteristics.
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Study on Calculation Method of Economic Velocity of Gas Phase Ethane Conveying Pipeline
Статья научная
Ethane is different from natural gas, crude oil, etc., its critical temperature is low, and it is easy to change phase with the change of ambient temperature. Therefore, it is necessary to increase the constraint condition to ensure that ethane is in the gas phase. Therefore, based on the optimization principle, the calculation model of the economical flow rate of the ethane transport pipeline including the ethane phase, the pipeline stability, and the compressor pressure ratio constraint is established with the lowest annual cost of the gas phase ethane pipeline. Solve the problem with the lowest cost. The gas-phase ethane transmission pipeline proposed in Tarim Oilfield is analyzed as an example. The results show that the economical flow rate of the pipeline under different working conditions ranges from 3 to 7 m/s, which guides the selection of the diameter of the Tarimethane pipeline. The economic design, safe operation and management of the ethane pipeline provide the basis.
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Study on Contact Fatigue Life Prediction for Clasp Joint Structure of Mooring Buoy
Статья научная
This paper focuses on predicting the contact fatigue life of the mooring buoy clasp joint structure by using the finite element program ANSYS/Fatigue. Mises equivalent stress is choosed as a stress-related fatigue criterion. An evaluation method of fatigue life under the pressure of buoyancy and wave force is established for the mooring buoy clasp joint structure. Firstly, wave force is treated as Morison dynamic force here and mooring buoys vibration model is conducted to analyze the dynamic response characteristics of vertical vibration of the mooring buoy. Secondly, dynamic contact stress calculations are conducted by directly exerting calculated vibration loads on the mooring buoy, and the stress spectrums of nodes are obtained. Finally, the S-N material fatigue curve and the Miner linear cumulative damnification principle are commonly applied to evaluate the contact fatigue life of the mooring buoy. The results show that the finite element program ANSYS/Fatigue can solve the contact fatigue problem simply, economically and efficiently. It also provides an effective engineering analysis method for these kinds of fatigue problems of the underwater mooring buoy.
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Study on the Application of Artificial Immunity in Virus Detection System
Статья научная
Artificial immunity, as a new technology, has been applied widely in virus detection system for its advantages. This paper emphasizes on these works as follows. Firstly, we analyze the disadvantages of traditional virus detection methods and new functions of artificial immune technology, and then review some typical algorithms of the existing virus detection system based on artificial immunity. Finally, a universal evaluating scheme is proposed. The purpose for this paper is to study the existent artificial immune methods and promote the new schemes emergence for virus detection system effectively.
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Статья научная
This research proposes an additional controller for load frequency control at a micro hydro power plant using PID-SMES. The PID-SMES parameters are optimized using smart methods, Imperialist Competitive Algorithms (ICA), which can find the optimal value of PID-SMES. From the analysis results, obtained on the P controller, overshoot of -0.0002176, with PI Controller -0.0002167, with PD Controller -0.0002128, with PID controller -0.0002118, with SMES controller -0.0001951, and with PID-SMES -4.11e-05. ICA optimization results obtained fitness function value of 1.79846040002633e-08, with 40 iterations. The minimum value of the system performance function at each iteration is plotted on the convergence graph shown. In the Figure it can be seen that the ICA algorithm can quickly converge on the 14th iteration or find the most optimal value at the 7th iteration. The PID-SMES controller proposed in this study has a significant influence in the damping of the oscillations. Therefore, it is proposed to be applied to micro-hydro.
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Supplier Selection through Application of DEA
Статья научная
In the increasing competition it has become important in business world to understand the different aspects of production and purchasing to understand the need for desired material in the organization. The managers have an important responsibility of selecting a good supplier by evaluating them on different parameters which is directly or indirectly associated with their overall performance. For decision making based on multiple criteria evaluation many methods of Multi-Criteria Decision Making (MCDM) is used by firms. Data Envelopment Analysis (DEA) is prominently used by firms nowadays. In this paper, analysis of DEA is done by measuring supplier performance of two firms: multi-national telecommunication corporation and a manufacturing firm. The firm uses the methodology according to their requirement and criteria for evaluating their suppliers and find best among them.
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