bluuebunny/crossref_metadata_2025 huggingface dataset:
Comparison of single and dual stator configurations of switched reluctance generator
Authors: Choi Dawoon , Li Jian , Sun Ning , Cho Yunhyun
Published: December 2018

This paper proposes a new structure of switched reluctance generator with dual stator (DSRG) for wind turbine application. It is conducive for wind turbine system to reduce the size and weight of nacelle. Advanced performance of DSRG can be verified by comparing with general structure of prototype SRG whose performance have been verified by result from several simulations and experimental measurement. To compare two types of SRG, experiment at same condition (3 kW 12/16 SRG with pole pitch of stator, rotor, and other dimensions) for accuracy of SRG's performance. As a result, we can reduce the weight and stack length at the same performance using DSRG so that compactness is available. In further study, Manufacture of DSRG will study and the effect of vibration and noise also study either for its structure.
Design of line-start permanent magnet motor with cost reduction and performance improvements
Authors: Choi Da-Woon , Li Jian , Cho Yun-Hyun
Published: December 2018

In this paper the cost reduction design of a three-phase line start permanent magnet synchronous motor (LSPM) due to increasing price of permanent magnet recently. Cost reduction can be effectively achieved by reducing PM material through optimization of the rotor structure using the response surface method. The PM volume was decreased by about 10%, while satisfying basic performance requirements and reducing torque ripple. Prototype machines with two the rotors were built and tested. Experimental results are compared in terms of efficiency, power factor.
Design of rotor shape for reducing torque ripple in interior permanent magnet motors
Authors: Seo Un-Jae , Chun Yon-do , Choi Jae-Hak , Han Pil-Wan , Koo Dae-Hyun
Published: December 2018

One of the major problems associated with interior permanent magnet machines is torque ripple, a problem that causes undesirable noise and possibly speed ripples. In this paper, rotor shaping near q-axis and its effects for torque ripple reduction are analyzed. Two new design variables are introduced for shaping the rotor pole. To verify the trade-off relationship between average torque and torque ripple by rotor pole shaping, the multi-objective optimization algorithm is employed to search the Pareto front of the problems. All results are obtained from 2D finite element analysis. The simulation results on two different lead angles are compared and the effect of rotor pole shaping is observed.
Design parameters and characteristics of aluminium and copper die casting induction motor for high efficiency
Authors: Han Pil-Wan , Chun Yon-Do , Choi Jae-Hak , Seo Un-Jae , Koo Dae-Yun , Lee Ju , Lee Won-Goo
Published: December 2018

A copper die casting motor (CDM) has better design flexibility than an aluminum die casting motor (ADM) because of the higher conductivity of copper. However, CDM has an economic and manufacturing weak point due to the high cost of copper and its high melting temperature compared to aluminium. This paper describes a comparison of the design parameters, specifications, performances and material cost between CDM and ADM of 2.2 kW_4P, 5.5 kW_4P, 7.5 kW_4P.
Development of a spherical stepping motor rotating around six axes
Authors: Gofuku Akio , Sasaki Ryo , Yano Tomoaki , Wada Yosuke , Shibata Mitsunobu
Published: December 2018

Spherical motors have an advantageous feature that they can rotate around multiple axes. From the advantage, spherical motors are expected to be applied to driving mechanisms of holonomic mobile robots, joints of robots, and so on. This study develops a spherical motor called 14–12 spherical stepping motor that can rotate around 6 axes. This paper describes the structure of the motor, rotation principle by five-phase ACs (Alternative Currents), a five-phase AC power supply, and rotation experiments to confirm the applicability of the motor.
Hall effect sensor based space vector PWM control of permanent magnet synchronous machine
Authors: Zhu Yu-Wu , Wang Dao-Han , Lee Sang-Geon , Cho Yun-Hyun
Published: December 2018

This paper proposes a space vector control of permanent magnet synchronous machine (PMSM) based on Hall effect sensor, which is very useful in practical applications due to the exactly same hardware structures between PMSM and brushless DC (BLDC) machine. This proposed method can be considered as an intermediate stage of development between the general incremental encoder based and sensorless based PMSM control methods. Because the Hall effect sensor is an absolute position sensor with 60-degree resolution, the position initialization process is not needed and the reversal rotation risk can be avoided. To improve resolution the interpolation method implemented by software is employed. Finally the high performance of this proposed method is validated by some experimental results.
Internal resonance of a flexible rotor supported by a magnetic bearing
Authors: Amano Ryosuke , Gotanda Hiroki , Sugiura Toshihiko
Published: December 2018

Magnetic bearings can support rotating rotors without any contacts. So it is possible to rotate a rotor at extremely high rotational speed. On the other hand, they can easily show elastic deformation with nonlinear oscillation, which is complicated and difficult to deal with. This study investigates nonlinear coupling of oscillation modes appearing in such a flexible rotor system with a magnetic bearing, by considering both the nonlinearity of the electromagnetic force and the continuousness of the rotor. First, an essential model of a rotor with an elastic shaft supported by a magnetic bearing was introduced. The numerical results indicate occurrence of internal resonance caused by the nonlinear coupling of the modes, if the ratio of their natural frequencies is 1 to 3 Experiments were also carried out and obtained results showed qualitative accordance to the numerical results.
Optimal design of permanent magnet linear synchronous motor for ultra low force pulsations
Authors: Wang Dao-Han , Zhu Yu-Wu , Lee Sang-Geon , Cho Yun-Hyun
Published: December 2018

The inherent drawback of iron-core type permanent magnet linear synchronous motor (PMLSM) is detent force that is dependent on several major factors such as pole-arc to pole-pitch ratio of magnet, slot clearance, and skewing. To minimize the detent force, this paper proposes a structure optimization using the combined computation of two dimensional (2-D) finite element method (FEM) and response surface methodology (RSM). The RSM, that is a collection of the statistical and mathematical techniques, is utilized to predict the global optimal solution based on the FEM calculated results of the detect forces for different combinations of factors. With the help of the combined computation the high capacity iron-core type PMLSM with more than 12000 N propulsion forces only contains less than 3 N detent forces.
Optimum design of an outer rotor and spoke type direct-drive machine for turret applications with large diameter
Authors: Hong Do-Kwan , Lee Ji-Young , Woo Byung-Chul , Chung Shi-Uk , Kang Do-Hyun
Published: December 2018

This paper deals with the optimum design focused on an LHS (Latin hypercube sampling) experiment with the many design variables of a developed motor and comparison of the optimum algorithm. The effective design variables are selected by screening and analysis of means (ANOM). In this paper, the optimum design is achieved by using the comparison response surface methodology(RSM) with the genetic algorithm (GA) method as the multiobjective optimum design. The torque ripple ratio is satisfied with a design goal within 3%. Therefore, multiobjective optimum design is considered between average torque and efficiency. The simulation results are compared with the experiment and show a deviation below 5%.
Permanent magnet linear synchronous motor with high air-gap flux density for transportation
Authors: Terata Mitusnobu , Fujii Nobuo
Published: December 2018

The characteristics of the high flux density linear synchronous motor (HFD-LSM) with the special field having V-letter array permanent magnets(PMs) are studied analytically by using a finite element method (FEM). For gap variation of plus or minus 4 mm to the typical gap 12 mm on the HFD-LSM with the thick PM of 40 mm, the change of thrust is only within 3% on the constant voltage drive. The change of efficiency is only within 0.5%. The efficiency considered only the copper loss exceeds 0.95 even in the case of the double length supply. The power factor is about 0.88 for maximum thrust drive. The influence of PM thickness appears remarkably on the power factor. For 10 mm thick PM, the reduction rate of the power factor is about 45% compared with 40 mm thick PM.
Reduction of inrush current by demagnetization of magnetic core
Authors: Horiszny Jacek
Published: December 2018

The peak value of three-phase transformer's inrush current depends, among other factors, on value of the residual flux in the iron core. Higher residual flux produces the inrush current of greater value. Diminishing of magnetism in the core can reduce value of the current. This article presents demagnetization of the transformer as a method of inrush current reduction. In the method proposed a condenser is the source of energy for demagnetization. Different condenser capacitances and voltages are implemented for calculation test to determine optimal values of these parameters. Later the residual flux established after demagnetization of the core is calculated for several initial values. Influence of the flux new value upon the inrush current is discussed.
Haptic perception mechanism of softness
Authors: Tsuchimi Daisuke , Okuyama Takeshi , Tanaka Mami
Published: December 2018

A palpation is convenient and it is a useful method to detect a cancer and to evaluate softness of skin. However, the palpation is skillful method, and the mental/physical conditions of the experts affect the result of the palpation easily. The result of palpation is subjective and it is hard to share the result with the other people. Therefore, the development of the sensor that can measure the softness of the body is demanded. In this paper, a relationship between physical properties of measured objects and the softness that human feel are investigated for a development of a tactile sensor system. At first, the relationship between tactile softness and stiffness of the measured objects is investigated. As a result, tactile softness decreases with the increase of stiffness of the objects. Next, the relationship between tactile softness and size of contact area of human finger are investigated. These results lead to the conclusion that there is a possibility that tactile softness of the objects are not only related to the contact force or displacement of a finger and the objects but also to the contact area of the finger and the measured objects.
Magnetic field inverse problem of grounding grid and its application
Authors: Yang Fan , Jiang Yan , Shi Qinyan , Chen Tao , He Wei
Published: December 2018

When the current distribution changes due to the breakage in the grounding grid, the magnetic field in the vicinity of the grounding grid will change, hence the magnetic field on the ground above the grounding can be used to detect the breakage of the grounding. In the paper, the magnetic field forward problem of the grounding grid is described firstly, and simulations were carried out when the breakage was located at different position. Results indicate that the maximum change of the magnetic flux density occurs at different measuring point when the breakage was located at different position. To achieve a more convenient method to detect the grounding grid fault, the magnetic field inverse problem of the grounding grid is presented, which is the process to calculate the current flowing in the grounding grid according to the magnetic field strength, and the method based on the global regularization and Damped Gauss-Newton method to solve the inverse problem is described, with which the ill-posed and ill-conditioning characteristic of the inverse problem can be diminished. Then the fault state of the grounding grid can be confirmed in the following way. Firstly, inject a 10∼30A current into the grounding grid, measure the magnetic field strength or the magnetic flux density at the measuring points on the ground above the grounding grid, then the current distribution can be obtained by solving the inverse problem. If the parameters of the soil are known, the resistance distribution can be obtained, with which the fault state of the grounding grid and the location of the fault can be confirmed. An equivalent model to verify the inverse problem was set up, and results indicate that the global regularization can diminish the ill-posed and ill-conditioning characteristic of the inverse problem.
Effect of electromigration on diffusional creep in polycrystalline materials
Authors: Shao Shan-Shan , Yang Fuqian , Xuan Fu-Zhen
Published: December 2018

An analysis was made of the diffusional creep in polycrystalline materials when subjected to simultaneous action of tensile stress and electric current. Incorporating the contribution of electromigration to atomic diffusion in grain boundaries, the problem of grain boundary diffusion was solved. A simple relationship was derived between diffusional creep rate and local electric field intensity (current density). The results showed that electromigration can enhance the diffusional creep in polycrystalline materials.
Time domain inverse scattering for a buried homogeneous cylinder in a slab medium using NU-SSGA
Authors: Chiu Chien-Ching , Huang Chung-Hsin
Published: December 2018

A time-domain inverse scattering technique for reconstructing a buried homogeneous cylinder with arbitrary cross section in a slab medium is proposed. For the forward scattering, the FDTD method is employed to calculate the scattered E fields. Base on the scattering fields, these inverse scattering problems are transformed into optimization problems. The non-uniform steady state genetic algorithm (NU-SSGA) is applied to reconstruct the location shape and permittivity of the two-dimensional homogeneous dielectric cylinder. The NU-SSGA is a population-based optimization approach that aims to minimize the objective function between measurements and computer-simulated data. A set of representative numerical results is presented for demonstrating that the proposed approach is able to efficiently reconstruct the electromagnetic properties of homogeneous dielectric scatterer even when the initial guess is far away from the exact one. In addition, the effects of Gaussian noises on the image reconstruction are also investigated.
Microwave imaging of a partially immersed non-uniform conducting cylinder
Authors: Chien Wei , Chiu Chien-Ching , Li Ching-Lieh , Sun Chi-Hsien
Published: December 2018

In this paper, we investigate the imaging problem to determine both the shape and the conductivity of a partially immersed non-uniform conducting cylinder from the knowledge of scattered far-field pattern of TM waves by solving the ill-posed nonlinear equation. Based on the boundary condition and the measured scattered field, a set of nonlinear integral equations is derived and the inverse problem is reformulated into an optimization one. The steady-state genetic algorithm is then employed to find out the global extreme solution of the object function. As a result, the shape and the conductivity of the conductor can be obtained. Numerical results are given to demonstrate that even in the presence of noise, good reconstruction can be obtained.
Mathematical modeling of induced current for electronic anti-fouling system and optimizing of the system parameters
Authors: Han Yong , Zhao Yongping , Chai Xin
Published: December 2018

A mathematical analytical modeling of induced current for electronic anti-fouling technology is deduced in the present study, which can directly measure induced electric field generated by excitation coil. Based on the analytical expression of induced current, average power density is presented to measure the force of electronic anti-fouling system acting on the aqueous solution, and the functional relationship between average power density and electronic anti-fouling system parameters is established, which can be made as the basis of the system parameters optimizing. By discussing the functional relationship it can be found: 1 when excitation signal frequency is higher than a certain frequency value, the increase of excitation signal frequency can't help increasing average power density effectively; 2 the coil radius is shorter or coil turns are less then the average power becomes larger. Furthermore, for proving the correctness of the proposed analytical model of induced current, an exact 2D finite element method is used to calculate induced current in a real electronic anti-fouling system, and the finite element calculation results can fit well with the results calculated by the proposed analytical model of induced current.
A numerically efficient method for the FDTD analysis of the shielding effectiveness of large shielding enclosures with thin-slots
Authors: Xiong Run , Chen Bin , Cai Zhaoyang , Chen Qiang
Published: December 2018

A numerically efficient method for the finite-difference time-domain(FDTD) analysis of shielding effectiveness (SE) of large shielding enclosures has been proposed in this paper. FDTD has been widely applied in the SE analysis, but it is difficult to analyze the SE using the standard FDTD method when large shielding enclosures with thin-slots are involved. To model the narrow apertures without involving too much memory occupation, the thin-slot formalism is adopted. The parallel implementation is induced into the simulation in order to overcome the limitation of a single processor's memory. To decrease the simulating time, windowing technique is used in the SE analysis. By using these artifices, the FDTD analysis of large shielding enclosures can be carried out efficiently.
Guided modes in the circular waveguide filled with uniaxial chiral medium
Authors: Dong Jian-Feng , Li Jie
Published: December 2018

The characteristics of guided modes in the circular waveguide filled with uniaxial chiral medium have been investigated. The dispersion equation of guided modes is derived. The dispersion curves, energy flux of guided modes for three kinds of uniaxial chiral media are presented. Abnormal dispersion characteristics and negative energy flux are found, i.e., backward wave is supported in the uniaxial chiral waveguide. It is also shown that the± m order guided modes have the same propagation constants.
The effects of rail coatings on melt-wave erosion in block armatures
Authors: Gong Fei , Weng Chun-Sheng
Published: December 2018

In this paper we investigate the influence of different rail coatings on melt-wave erosion (MWE) in block armatures. A two-dimensional numerical model is developed and the finite difference method is used to simulate the transient evolution of MWE. The results of numerical calculations show a local concentration of current and joule heating at the interface, and MWE occurs at the trailing corner of the block armature. Five different pure metals are used as the rail coatings to improve the launching performance of the railgun. Important electrical parameters of coatings are analyzed through comparing the axial erosion distance and the vertical gap thickness. It is observed that the coating materials with a higher electrical conductivity than that of rail material are helpful to delay the spread of MWE. The results are inspiring and contribute to apply the rail coatings to solid-armature railguns.
Flux-pinning-induced magnetostriction in a transversely isotropic functionally graded superconducting slab
Authors: Zhang Rong , Ma Peng , Li Qing Hui
Published: December 2018

Applying the plane strain approach, the flux-pinning-induced magnetostriction of a transversely isotropic functionally graded long rectangular superconducting slab is studied analytically. The effects of both the applied magnetic field and elastic property distribution on magnetostriction for different symmetric cases of the slab are shown graphically and discussed in detail. Results presented in this paper should have potential applications to the design of superconducting materials and devices.
Finite element analysis of a unimorph cantilever for piezoelectric energy harvesting
Authors: Wang Qingping , Pei Xuebing , Wang Qi , Jiang Shenglin
Published: December 2018

A finite model based on the classical laminated plate theory is presented for the unimorph piezoelectric cantilever. The formulations of static and dynamic analysis are derived from the variation principle. Three material parameter matrices of the PZT are taken into account in the present model. The static analysis of the piezoelectric cantilever is performed to investigate the influence of the geometric parameters on the output voltage, and model analysis is selected to determine the natural frequency and eigenmodes. To validate the simulation results, an experiment on a unimorph cantilver with brass substrate was carried out. The experiment results were found to be in good agreement with the simulation results. The results indicate that the finite model can be beneficial to designing ideal piezoelectric energy harvesting devices.
Numerical and experimental study on effect of process parameters on preparation of A356 aluminum alloy semi-solid slurry by electromagnetic stirring
Authors: Dao Vanluu , Zhao Shengdun , Lin Wenjie
Published: December 2018

A two-dimensional model coupling of the electromagnetic field, the temperature field and the flow field of preparation of A356 aluminum alloy semi-solid slurry by electromagnetic stirring (EMS) was established. The Power Law Cut-Off (PLCO) model was used to model the semi-solid slurry. The effect of process parameters such as stirring frequency, stirring current, pouring temperature and crucible preheated temperature on the electromagnetic field, temperature field and flow field were investigated by finite element code ANSYS combined with secondary development INTEL FORTRAN software and corresponding experimental verification. The results show that the electromagnetic field and flow field increase as stirring frequency and stirring current increase. Similarly, temperature field and flow field increase as pouring temperature and crucible preheated temperature increase. However, too high stirring frequency, stirring current, pouring temperature and crucible temperature may lead to rapid increase in the flow field, as a result, strongly turbulent flow might occur. The reasonable process parameters for preparation of A356 alloy semi-solid slurry by EMS were obtained. The simulation results are significantly approved with corresponding experimental ones, that verifying the reliability of the calculation models and the software algorithm.
Automated design of magnetic circuit of induction machines using multiobjective optimisation techniques and finite element method
Authors: Canova A. , Chiampi M. , Ragusa C. , Repetto M.
Published: December 2018

In this paper an automated multiobjective optimisation based on fuzzy logic is applied to the magnetic core design of induction machines. The fuzzy logic is used in order to merge all the objectives of the vector optimisation in a single scalar function, so that the problem can be handled through a scalar optimisation algorithm. The estimation of the objectives is obtained through the field analysis performed by the Finite Element Method (FEM). The proposed procedure is used to improve performances of industrial induction motors where iron losses, electromotive forces and weight are optimisation objectives, while airgap thickness, external stator radius and stator tooth width are considered as design parameters.
Comments on “Transient electromagnetic field of dipole source in chiral medium” by D. Cheng [Int. J. Appl. Electromagn. Mech. 8 (1997), 179–183]
Authors: Lakhtakia Akhlesh
Published: December 2018

Cheng obtained the electromagnetic fields radiated by a time-varying source in a homogeneous chiral material, but the results are unphysical because the essentially dispersive nature of chiral materials was totally ignored in the analysis.
Optimal design of windings for the continuous induction hardening process of steel bars
Authors: Di Barba P. , Dughiero F. , Trevisan F.
Published: December 2018

An inverse problem concerning the industrial process of steel bars hardening is considered. The associated optimization problem is formulated in terms of normalized membership functions and, for the sake of comparison, also in terms of quadratic residuals; both geometric and electromagnetic design variables have been considered. The numerical solution is achieved by coupling an electrothermal field simulator to a deterministic strategy of minimization.
Genetic algorithm for training dynamical object emulator based on RBF neural network
Authors: Sergeev S.A. , Mahotilo K.V. , Voronovsky G.K. , Petrashev S.N.
Published: December 2018

The combination of Genetic Algorithms (GAs) and Artificial Neural Networks (ANNs) has already resulted in researchers advancing in quite a few real world applications but it is in control that this alliance yields such appreciable benefit.

The paper reports a Radial Basis Function (RBF) network training technique which joins together global strategy of GAs and a local adjusting procedure typical for RBF networks. While activation function window centres and widths are processed via a “slow” numeric GA, output‐layer neurone synaptic weights are defined by a “fast” analytical method.

The technique allows to minimize not only the network hidden-layer size but also the pattern set required for training the adequate dynamical object neuroemulator.
Design sensitivity of electro-thermal systems for exciting-coil positioning
Authors: Kwak In-gu , Byun Jin-kyu , Park Il-han , Hahn Song-yop
Published: December 2018

This paper presents a design sensitivity algorithm for temperature distribution control in induction heating problems which require electro-thermal analysis. The eddy current distribution is calculated with the electromagnetic 2D finite element procedure. The obtained eddy current becomes a heat source which determines the temperature distribution, which is also obtained by the thermal 2D finite element method. In this paper, the goal of the design is to have the uniform distribution of the temperature on a surface of heated metal. The positions of exciting coils are taken as design parameters. The steepest descent method is used as an optimization algorithm. For the optimal design of an induction heating system, the design sensitivity is derived using the relation of two analysis system equations, and is applied to a numerical example.
Enhancing the range of waveguide measurement setups for chiral media by step discontinuities
Authors: Busse G. , Jacob A.F.
Published: December 2018

A key to expand the range of waveguide measurement setups for chiral materials is to introduce step discontinuities. Therefore, in this paper the discontinuity of a chiral section of differing diameter in an otherwise empty circular waveguide is analysed by means of a mode‐matching technique. The frequency‐dependent scattering parameters are calculated for some typical constitutive parameters and geometries. The validity of this concept is confirmed by the inversion of these results.
One-dimensional and two-dimensional microstrip periodic structures on the bianisotropic substrate
Authors: Nefedov Igor S.
Published: December 2018

An efficient spectral-domain full-wave algorithm based on a 4 x 4 transfer matrix and the integral equation method is developed for microstrip lines and microstrip discontinuities, embedded into multilayered bianisotropic media. A method for the reduction of singularity order of Green’s dyadic is proposed. An infinite array of microstrip lines and a 2D microstrip grating, formed by rectangular elements are considered. The dispersion characteristics of 1D slow‐wave structures and the resonant frequencies of 2D grating are computed. The dependence of these characteristics upon the chirality and nonreciprocity of bianisotropic media is studied.
Buckling of a piezoelectric plate
Authors: Yang J.S.
Published: December 2018

Equations for the buckling of a thin piezoelectric plate are obtained from an existing set of equations for the extension and flexure of piezoelectric plates. The equations for buckling are specialized for piezoelectric ceramic plates poled in the thickness direction. Solutions for the buckling of a ceramic plate into cylindrical shape and the buckling of a rectangular ceramic plate are obtained. The effect of piezoelectricity on the critical load for buckling of a ceramic plate is examined. Results show that the effect of piezoelectricity is not negligible.
Physiological response and susceptibility of strawberry cultivars to the charcoal rot caused by Macrophomina phaseolina under drought stress conditions
Authors: Sánchez S. , Grez J. , Contreras E. , Gil P.M. , Gambardella M.
Published: December 2018

BACKGROUND:

Charcoal rot of strawberry ( Macrophomina phaseolina) is an emerging disease difficult to manage, a desirable alternative is the use of resistant cultivars. However, little is known regarding the reaction of cultivars to the pathogen under water stress conditions.

OBJECTIVE:

The aims of this work were to study the effect of water stress on the physiology of four strawberry cultivars during the infection, and to determine the relationship between water stress and cultivar susceptibility.

METHODS:

Healthy and inoculated plants of ‘Monterey’, ‘Albion’, ‘Camarosa’ and ‘Sabrina’ were maintained under no irrigation and full irrigation regimes, in greenhouse conditions. Stem water potential (SWP) and stomatal conductance (gs) were evaluated. The disease severity was recorded weekly for seven weeks.

RESULTS:

The disease detrimentally affected the water relations in ‘Sabrina’, ‘Albion’ and ‘Monterey’. A significant correlation was detected between the evaluated parameters and the disease severity. The disease severity increases in plants with no irrigation, regardless of cultivar.

CONCLUSIONS:

Our results show that the infection caused by M. phaseolina increases the negative effects of water stress, depending on the genotype, and that the cultivars that were able to maintain more stable water relations respond better to the disease.
Electromagnetic scattering∼of metallic cylinders of arbitrary shape by using asynchronous particle swarm optimization and non-uniform steady state genetic algorithm
Authors: Li Ching-Lieh , Sun Chi-Hsien , Chiu Chien-Ching , Tuen Lung-Fai , Su Chien-Hua
Published: December 2018

Two techniques for the shape reconstruction of multiple metallic cylinders from scattered fields are investigated in this paper, in which two-dimensional configurations are involved. After an integral formulation, the method of moment (MoM) is applied to solve it numerically. Two separate perfect-conducting cylinders of unknown shapes are buried in one half-space and illuminated by the transverse magnetic (TM) plane wave from the other half space. Based on the boundary condition and the measured scattered field, a set of nonlinear integral equation is derived and the imaging problem is reformulated into optimization problem. The non-uniform steady state genetic algorithm (NU-SSGA) and asynchronous particle swarm optimization (APSO) are employed to find out the global extreme solution of the object function. Numerical results demonstrate even when the initial guesses are far away from the exact shapes, and the multiple scattered fields between two conductors are serious, good reconstruction can be obtained. In addition, the effect of Gaussian noise on the reconstruction results is investigated and the numerical simulation shows that the reconstruction results are good and acceptable, as long as the SNR is greater than 20 dB.
Modified stem cells algorithm for Loney's solenoid benchmark problem
Authors: Taherdangkoo Mohammad
Published: December 2018

In this paper, we propose a new method for solving the Loney's solenoid benchmark problem based on stem cells algorithm (SCA). The key idea of the algorithm is using a modified version of our proposed stem cells optimization method that can efficiently achieve the best solution for the position and size of two correcting coils in the famous Loney's solenoid problem. The results show the superiority of the proposed method on other previously proposed methods for electromagnetic optimization.
Dynamical characteristics of a ferrofluid acceleration sensor
Authors: Li Qiang , Yuan Zuobin , Yang Yongming , Lv Jun , Xiang Hui
Published: December 2018

In this paper the dynamical characteristics of a ferrofluid acceleration sensor are studied experimentally and theoretically. The stiffness coefficient and damping coefficient are key factors in dynamical characteristics of a ferrofluid acceleration sensor. The damping coefficient depends on the viscosity of ferrofluid. The experimental data is very close to theoretical calculation.
Robust design of a direct-drive PM hub motor by fuzzy-inference taguchi method
Authors: Gaing Zwe-Lee , Chiang Jui-An
Published: December 2018

In this paper, using the fuzzy-inference Taguchi method with multiple performance characteristics index (MPCI), a novel systematic approach is employed to obtain the robust design of a brushless permanent-magnet (PM) hub motor with both lower torque ripple factor and higher efficiency. According to the geometric parameters of the PM motor, we select the controllable factors and their levels, such as the permanent magnet thickness in rotor, air-gap width, opening slot width and slot tooth width at stator. The proposed method first establishes the orthogonal array (OA) that is required by the Taguchi method. Then, the multiple targets are coordinated by the fuzzy inference mechanism to obtain the better combination of the geometric parameters for achieving multiple quality targets. Finite element method (FEM) is employed as the tool for analyzing the torque ripple and performance of the PM motor, and results have indicated that the proposed method can obtain the suitable motor's geometric parameters for reducing the cogging torque and enhancing the operating efficiency.
THE INTERNATIONAL CONFERENCE ON INFORMATICS IN SCHOOLS ISSEP 2018
Authors: Bosova L. L. , Kaplan A. V.
Published: December 2018

The article describes the main areas of work of ISSEP — the international conference on school informatics, which has been held since 2005; in 2018 the conference was frst held inRussia. There is the summary of the main reports by sections: “Sustainable Education in Informatics for Pupils of All Ages. Role of Programming and Algorithmics”, “National Concepts of Teaching Computer Science. Research on Informatics in Schools”, “Teacher Education in Informatics”, “Contests and Competitions in Informatics”, “Socio-Psychological Aspects of Teaching Informatics”, “Computer Tools in Teaching and Studying Informatics”.
SOME FEATURES OF PROGRAMMING IN MATHCAD PRIME
Authors: Abukhba A. M.
Published: December 2018

Some distinctive features of programming in the system of computer mathematics Mathcad Prime are considered in the article. Examples of various programs that contribute to understanding the essence of these features are given.
THE VIDEOCOURSE “FACIAL ANIMATION IN BLENDER”
Authors: Chechko D. A. , Radionova A. V.
Published: December 2018

One of the most difcult areas of 3D computer graphics is a facial animation. To create it, you need knowledge of facial muscles anatomy, methods and techniques of facial animation, skills in a 3D modeling software. The article describes facial animation tutorials in Blender. The tutorials introduce two methods of facial animation: using shape keys and motion tracking. The tutorials can be used at school, but requires basic Blender knowledge.
THE EUROPEAN UNION FORUM ON KIDS’ SAFETY IN INTERNET SIF 2018
Authors: Bogdanova D. A.
Published: December 2018

The article provides an overview of the activities of the European Union Forum on kids’ safety in Internet Safer Internet Forum (SIF) 2018, which was held inBrussels,Belgium, in November 2018. The current Internet risks addressed by the World Wide Web users, especially children, are described.
Bireysel Yenilikçilik ve Algılanan Örgütsel Destek Düzeyi İlişkisi: İstanbul Otelleri Örneği
Authors: Işık Cem , Hajiyeva Tahmina
Published: December 2018

Bu çalışmada bireysel yenilikçilik ve algılanan örgütsel
destek düzeyi ilişkisi incelenmiştir. Bu amaçla İstanbul ilinde (Beyoğlu, Şişli
ve Fatih) faaliyet gösteren 3-4 ve 5 yıldızlı otel işletmeleri çalışanlarından
anket yoluyla toplanan veriler çeşitli istatistiki analizlere tabi tutulmuştur.
Araştırma sonuçları otel işletmelerinde çalışan bireylerin yenilikçiliğe
istekli olduklarını veya olabileceklerini gösterirken, bireysel yenilikçilik
ile algılanan örgütsel destek arasında ise pozitif yönde anlamlı bir ilişkiyi
teyit etmektedir.
A Review on Big Data Analytics in Business
Authors: Sandhu Manbir , Saini Purnima, Anuradha
Published: December 2018

Big data is a fast-growing technology that has the scope to mine huge amount of data to be used in various analytic applications. With large amount of data streaming in from a myriad of sources: social media, online transactions and ubiquity of smart devices, Big Data is practically garnering attention across all stakeholders from academics, banking, government, heath care, manufacturing and retail. Big Data refers to an enormous amount of data generated from disparate sources along with data analytic techniques to examine this voluminous data for predictive trends and patterns, to exploit new growth opportunities, to gain insight, to make informed decisions and optimize processes. Data-driven decision making is the essence of business establishments. The explosive growth of data is steering the business units to tap the potential of Big Data to achieve fueling growth and to achieve a cutting edge over their competitors. The overwhelming generation of data brings with it, its share of concerns. This paper discusses the concept of Big Data, its characteristics, the tools and techniques deployed by organizations to harness the power of Big Data and the daunting issues that hinder the adoption of Business Intelligence in Big Data strategies in organizations.
建筑工程成本影响因素及降低成本控制策略
Authors: 袁 志强
Published: December 2018

随着经济建设的发展,我国的城市化进程也在不断推进,在一定程度上带动了建筑行业的发展,但同时也加大了建筑行业的市场竞争,而面对激烈的市场竞争,建筑企业想要确保自身的竞争优势,需要在保证工程质量的同时,对工程成本进行有效的控制,以此来提升自身的经济效益,使自身的平稳发展得到保证,因此,本文围绕建筑工程中的成本控制进行讨论,对该项工作中的影响因素加以了解,并探讨成本控制的具体措施,希望能够有效提升建筑企业的成本控制水平,使其发展目标得以实现。
强化水电安装施工监理的有效途径与方法
Authors: 李 艳
Published: December 2018

作为一名专业、杰出的工程监理人员,其在注重工作效率的同时,也要具备良好的现场监理执行力,要用自身专业技能以及专业的态度,对工程进行全过程监控。在具体实践过程中,监理人员不仅需要妥善做好表面上的监理工作,同时还要对隐藏工程进行重点关注,确保自身能够对施工图纸有一个详细、深入的了解,如此才能为工程建立质量提供保障。本文主要对强化水电安装施工监理的有效途径进行了分析研究。
新型绿色建筑工程造价预算与成本控制
Authors: 赵 凯
Published: December 2018

我国经济的飞速发展,致使我国城镇化建设和工业化建设脚步也越来越快。但是在这种高速发展的背后,国家也面临着严重的环境污染和能源紧缺问题。随着人们生活水平和文化程度的提高,对环境保护的关注度也越来越高。因此,在建筑企业的发展过程中,想要实现稳定发展,就必须注重对新型绿色建筑工程的关注程度。在其整体建设过程中,设计方案必须着考虑多种因素,同时也要加强对绿色能源的使用,这也进一步增大了建筑工程成本控制和造价预算的难度。本文首先对新型绿色建筑工程的基本内容和概念进行分析,其次就其成本控制和造价预算的特点和意义进行阐述,最后提出了如何做好新型绿色建筑工程成本控制和造价预算工作的具体措施,希望具有一定参考价值。
装配式建筑工程管理的影响因素与对策
Authors: 张 玉林
Published: December 2018

在建筑行业当中,装配式建筑在工程施工方面具有一定的系统性和复杂性,会涉及到诸多工序,因此,在施工当中可能会出现各种各样的质量问题或安全隐患问题,而这些问题不仅关系到建筑行业的发展,同时还会对人们的生活水平造成相应的影响,而为了确保建筑行业的可持续发展,必须要对其工程管理工作进行不断的强化,只有如此,才能为建筑行业的发展提供驱动力,所以,文章围绕装配式建筑中的工程管理进行讨论,对装配式建筑进行深入的了解,明确其工程管理过程中的相关影响因素,并对强化工程管理的具体措施加以探讨和描述,希望能够使装配式建筑的工程管理水平得到进一步的提升。
小议门式刚架结构工程常见质量问题及预防措施
Authors: 张 晓旭
Published: December 2018

门式刚架结构在我国应用十分广泛,但是在工程建设的过程中也容易出现质量问题,造成较大的财产损失,影响工程性能,因此我们必须正确认识门式刚架结构工程中常见的问题,并采取有效的预防措施保证工程建设的质量。
探讨人防工程深基坑中土钉支护的技术分析
Authors: 徐 柳
Published: December 2018

在人防工程深基坑支护施工中,土钉支护法应用较为广泛,其可十分有效地提升不良土层的稳定性,优势十分明显。本文就将分析重点放在人防工程中的深基坑土钉支护技术上,以供参考。
MODEL KEBIJAKAN IMPLEMENTASI REKRUTMEN PEJABAT STRUKTURAL PADA JABATAN KARIR PEGAWAI NEGERI SIPIL DI KABUPATEN BOLAANG MONGONDOW UTARA
Authors: Harun Nur Istiyan
Published: December 2018

Penelitian ini bertujuan untuk menggambarkan serta menganalisis bagaimana pola penataan jabatan struktural yang ada di kabupaten Bolaang Mongondow Utara. Adapun aspek yang dilihat dalam konteks penataan jabatan struktural ini ada tiga aspek yakni; kompetensi dari pejabat struktural, proses rekrutmen pejabat struktural dan kendala yang dihadapi dalam rekrutmen pejabat struktural di Kabupaten Bolaang Mongondow Utara.

Peraturan Pemerintah Republik Indonesia nomor 13 tahun 2002 tentang perubahan atas Peraturan Pemerintah Republik Indonesia nomor 100 tahun 2000 tentang pengangkatan pegawai negeri sipil dalam jabatan struktural pada bab III tentang pengangkatan, pemindahan, dan pemberhentian dalam dan dari jabatan struktural pasal 5 dan 6 serta bab V tentang penilaian dan pertimbangan pengangkatan dalam jabatan dijelaskan bahwa pengangkatan pejabat struktural didasarkan pada senioritas dalam kepangkatan, usia, pendidikan dan pelatihan jabatan dan pengalaman yang dimiliki. Dalam hal ini, peneliti ini menggambarkan sejauh mana Pemerintah Daerah Bolaang Mongondow Utara menerapkan aturan tersebut dalam proses rekrutmen pejabat struktural.

Penelitian ini menggunakan metode studi kasus sebagai langkah untuk membantu peneliti dalam merekam dan dalam pengambilan data. Karena spesifik penelitian ini ingin menjelaskan bagaimana pola penataan jabatan struktural yang ada di kabupaten Bolaang Mongondow Utara. Dengan metode ini peneliti dapat mengakrabkan diri dengan subyek penelitian secara langsung dalam waktu tertentu dengan menerapkan teknik pengumpulan data melalui observasi, dokumenter dan wawancara mendalam.

Dari hasil penelitian menunjukan bahwa: 1). Terkait dengan kompetensi dan keahlian yang dimiliki oleh setiap pegawai, dapatlah dikatakan masih rendah, alasannya adalah sejauh ini banyak pegawai Golongan III yang direkruit, tetapi didominasi oleh tenaga fungsional, seperti guru dan dokter serta keperawatan. Sehingga ada beberapa jabatan yang harus diisi level struktural belum ditempati, karena belum ada pegawai yang memenuhi syarat untuk posisi tersebut, khususnya terkait dengan kepangkatan. 2). Proses perekrutan pejabat eselon secara teknis tetap mengacu pada Peraturan Pemerintah Nomor 13 Tahun 2002 yang mengatur tentang mekanisme pengangkatan pejabat struktural. 3) Terdapat 3 kendala utama didalam pelaksanaan rekrutmen pejabat struktural di Kabupaten Bolmong Utara , yaitu sumber daya manusia (SDM), kondisi fasilitas kerja, dan program kerja yang memberikan dampak yang begitu besar terhadap kinerja institusi. Kabupaten Bolmong Utara adalah kabupaten yang sementara membangun karena baru dimekarkan pada tahun 2007,sebagai daerah pemekaran terdapat keterbatasan kapasitas sumber daya manusia (SDM) yang kompeten, yakni banyaknya aparatur pemerintah daerah yang di rekrut tidak berdasarkan analisis kebutuhan masing-masing di Satuan Kerja Perangkat Daerah (SKPD), di tambah pula kompetensi dan keterampilan tidak menjadi pertimbangan utama di dalam proses perekrutan.
ANALYSIS OF FACTORS THAT INFLUENCE THE QUALITY OF INFORMATION OF REGIONAL GOVERNMENT FINANCIAL STATEMENTS, POHUWATO REGENCYANALISIS FAKTOR - FAKTOR YANG MEMPENGARUHI KUALITAS INFORMASI LAPORAN KEUANGAN PEMERINTAH DAERAH KABUPATEN POHUWATO
Authors: Lamuda Ilyas , B Ng Syamsiah
Published: December 2018

AbstractThe purpose of this study  To analyze the competence of Human Resources  effect the quality of information financial statements. To analyze the Regional Financial Supervision affect the quality of information financial statements. To analyze the System Internal control affects the quality of financial statements.   This research takes place at the Government  Pohuwato District.  Data collection method was done by distributing questionnaires. Data obtained in though by using descriptive statistic ie percentage and frequency, then processed data quality test analysis techniques and hypothesis test using Software Statistical Product and Service version 20.  The result of the test shows that together the independent variable of human resource competence, the supervision of regional finance and the internal control system have an effect on the quality of the financial report information of the local government of Pohuwato Regency. Penelitian ini  bertujuan; Untuk menganalisis kompetensi Sumber Daya Manusia (SDM) mempengaruhi kualitas informasi laporan keuangan. Untuk menganalisis Pengawasan Keuangan Daerah berpengaruh terhadap kualitas informasi laporan keuangan. dan Untuk menganalisis Sistem Pengendalian Intern mempengaruhi kualitas informasi laporan keuangan Pemerintah Daerah Kabupaten Pohuwato. Obyek penelitian pada Satuan Kerja Perangkat Daerah Pemerintah Kabupaten Pohuwato. Metode pengumpulan data dilakukan dengan membagikan kuesioner kepada responden dilingkungan Pemerintah Daerah Kabupaten Pohuwato. Data yang diperoleh diolah dengan menggunakan statistic deskriptif yakni persentase dan frekuensi, kemudian diolah teknik analisis uji kualitas data dan uji hipotesis menggunakan Software Statistical Product and Service versi 20. Hasil pengujian menunjukkan bahwa secara bersama-sama variabel bebas kompetensi sumber daya manusia, pengawasan keuangan daerah dan sistem pengendalian intern berpengaruh terhadap kualitas informasi laporan keuangan pemerintah daerah Kabupaten Pohuwato
A Computer-Assisted Systematic Search for Melatonin Derivatives with High Potential as Antioxidants
Authors: Reina Miguel , Castañeda-Arriaga Romina , Perez-Gonzalez Adriana , Guzman-Lopez Eduardo Gabriel , Tan Dun-Xian , Reiter Russel J. , Galano Annia
Published: December 2018

A systematic rational search for newly designed melatonin derivatives, was performed using a computer-assisted protocol. A total of 116 derivatives were generated by adding functional groups (i.e., -OH, -NH2, -SH and -COOH) to the melatonin structure. A selection score (SS) was built to sample the search space, simultaneously considering ADME (absorption, distribution, metabolism, excretion) properties, toxicity and manufacturability (i.e., synthetic accessibility). The search characterized the whole set of designed melatonin derivatives and allowed the selection of a reduced subset of 20 melatonin derivatives that are expected to be the most promising, regarding drug-like behavior. For this subset, several reactivity indices were estimated, as well as their pKa values. According to the gathered data, 5 melatonin derivatives have been identified as the most likely candidates to act as chemical antioxidant (directly scavenging free radicals, by electron transfer and/or H transfer). All of them are predicted to be better for that purpose than melatonin itself or trolox (water soluble vitamin E analog). The findings from this work are expected to motivate further investigations on these molecules, using both theoretical and experimental approaches.
Melatonin plays a pivotal role in conferring tolerance against endoplasmic reticulum stress via mitogen-activated protein kinases and bZIP60 in Arabidopsis thaliana
Authors: Lee Hyoung Yool , Back Kyoungwhan
Published: December 2018

Melatonin has diverse roles as a signaling molecule that activates a number of downstream defense systems against various biotic and abiotic stresses in plants. However, there have been no reports regarding a direct protective role of melatonin against endoplasmic reticulum (ER) stress. Here, we report that exogenous melatonin treatment attenuated ER stress damage by preserving ER structure and enhancing secretory protein folding capacity in response to tunicamycin treatment. Further transgenic experiments indicated that melatonin-deficient snat1 mutant was hypersensitive to ER stress, whereas melatonin-proficient SNAT1 overexpression (OE) was tolerant to ER stress, as evidenced by reduced ion leakage and higher transcript levels of ER chaperones, including luminal binding protein (BIP) 2, BIP3, and CNX1, compared to wild-type controls. Moreover, this melatonin-mediated ER stress tolerance was dependent on the bZIP60 transcription factor and mitogen-activated protein kinase. Our data suggest that melatonin is actively involved in maintaining homeostasis of the ER during normal plant growth, and also has a protective effect against many environmental stressors that induce ER stress.