EMITTER-International Journal of Engineering Technology最新文献_第3页

Design Analysis of Array of Dipole Transmitters for Wireless Power Transfer 用于无线电力传输的偶极发射机阵列设计分析

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EMITTER-International Journal of Engineering Technology Pub Date : 2022-04-26 DOI: 10.24003/emitter.v10i1.638

Junior Milembolo Miantezila, V. Adewuyi, E. Owoola

{"title":"Design Analysis of Array of Dipole Transmitters for Wireless Power Transfer","authors":"Junior Milembolo Miantezila, V. Adewuyi, E. Owoola","doi":"10.24003/emitter.v10i1.638","DOIUrl":"https://doi.org/10.24003/emitter.v10i1.638","url":null,"abstract":"Considered in this work are the radiation aspects of a radio-frequency wireless power transfer system. Using the halfwave dipole as a candidate of choice, the current distribution on the antenna is first evaluated and presented using the versatile electromagnetic numerical Method of Moment technique (MoM). Using the current distribution obtained from the kernel of integration, the radiation fields for the single dipole element was obtained. Also, the analysis is extended to uniformly space linear antenna arrays using broadside and ordinary endfire arrays as candidates of interest. The simulation results for the broadside and endfire arrays were presented for 5, 6, 7, 10, 20 and 30 array elements at 0.3, 0.4 and 0.5 inter-element spacing. The peak directivity of broadside array occurs at 30 elements, 0.5λ spacing, and exceeds endfire array peak directivity by 11.27%. In addition to the advantage of an improved directivity achieved by the 7-element broadside array, an improved peak sidelobe level (PSLL) with the lowest PSLL for 7, 20, and 30 elements broadside array occurring at -12.0534 dB, -12.4298 dB, -12.6642 dB, -13.2246 dB, and -13.2747 dB respectively.","PeriodicalId":40905,"journal":{"name":"EMITTER-International Journal of Engineering Technology","volume":"11 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81852632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Improvement of Computer Based Test System Based on TCExam for Usage with A Large Number of Concurrent Users 基于TCExam的大并发用户计算机考试系统的改进

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EMITTER-International Journal of Engineering Technology Pub Date : 2022-04-07 DOI: 10.24003/emitter.v10i1.667

Yunarso Anang, Rahadi Jalu Yoga Utama, Masakazu Takahashi, Yoshimichi Watanabe

{"title":"An Improvement of Computer Based Test System Based on TCExam for Usage with A Large Number of Concurrent Users","authors":"Yunarso Anang, Rahadi Jalu Yoga Utama, Masakazu Takahashi, Yoshimichi Watanabe","doi":"10.24003/emitter.v10i1.667","DOIUrl":"https://doi.org/10.24003/emitter.v10i1.667","url":null,"abstract":"Computer-based test or assessment has been used widely, especially in the current COVID-19 pandemic, where many schools are conducting distance learning as well as distance examination. The need for a computer or software system to support education is inevitable. A range of solutions, from the free/open source software systems to the paid/proprietary ones have been publicly available. Still, an organization with limited resources prefers to find free or low-budget, while yet demanding reliable solutions. We have reported the use of the computer-based test in a new student recruitment test which is held country-wide. We developed the system based on TCExam, a free and open source computer-based test software, and successfully fulfilled the requirements, but with some tweaks. We found that the TCExam has a performance degradation when used by a large number of examinees concurrently, especially during specific phases during the test. This paper reports the result of our investigation to address the problem and suggests some modifications to the base codes as well as a recommendation of the hardware configuration. We evaluated the modified system in a simulated environment. We successfully achieved up to 56% performance gain using the modified system.","PeriodicalId":40905,"journal":{"name":"EMITTER-International Journal of Engineering Technology","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84344683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated Multi-view 3D Image Capture and Motion Parallax 3D Display System 集成多视图3D图像捕获和运动视差3D显示系统

IF 0.5

EMITTER-International Journal of Engineering Technology Pub Date : 2022-03-22 DOI: 10.24003/emitter.v10i1.604

M. Lal, Shadi Khan Baloch, Shoaib R. Soomro

{"title":"Integrated Multi-view 3D Image Capture and Motion Parallax 3D Display System","authors":"M. Lal, Shadi Khan Baloch, Shoaib R. Soomro","doi":"10.24003/emitter.v10i1.604","DOIUrl":"https://doi.org/10.24003/emitter.v10i1.604","url":null,"abstract":"We propose an integrated 3D image capture and display system using a transversely moving camera, regular 2D display screen and user tracking that can facilitate the multi-view capture of a real scene or object and display the captured perspective views in 3D. The motion parallax 3D technique is used to capture the depth information of the object and display the corresponding views to the user using head tracking. The system is composed of two parts, the first part consists of a horizontally moving camera interfaced with a customized camera control and capture application. The second part consist of a regular LCD screen combined with web camera and user tracking application. The 3D multi-view images captured through the imaging setup are relayed to the display based on the user location and corresponding view is dynamically displayed on the screen based on the viewing angle of the user with respect to the screen. The developed prototype system provides the multi-view capture of 60 views with the step size of 1 cm and greater than 40˚ field-of-view overlap. The display system relays 60 views providing the viewing angle coverage of ±35˚ where the angular difference between two views is 1.2˚.","PeriodicalId":40905,"journal":{"name":"EMITTER-International Journal of Engineering Technology","volume":"49 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84866432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermo mechanical and microstructural constituents of dissimilar S700MC-S960QC high-strength steel welded joints using overmatched filler wire 异种S700MC-S960QC高强度钢超配焊丝焊接接头的热力学和显微组织成分

IF 0.5

EMITTER-International Journal of Engineering Technology Pub Date : 2022-01-17 DOI: 10.14419/ijet.v11i1.31873

Francois Njock Bayock, Marius Tony Kibong, Sadrack Timba, Nji Nelson Che

{"title":"Thermo mechanical and microstructural constituents of dissimilar S700MC-S960QC high-strength steel welded joints using overmatched filler wire","authors":"Francois Njock Bayock, Marius Tony Kibong, Sadrack Timba, Nji Nelson Che","doi":"10.14419/ijet.v11i1.31873","DOIUrl":"https://doi.org/10.14419/ijet.v11i1.31873","url":null,"abstract":"In this study, a mechanical and microstructural constituent of welded joints of dissimilar high-strength and ultra-high-strength steels (S700MC/S960QC) using overmatched filler wire was evaluated. Three different heat inputs (18 kJ/cm, 8 kJ/cm, and 10 kJ/cm) and overmatched filler wire were applied using the GMAW process. Micro-hardness measurement was conducted using Vickers hardness test, tensile test, and microstructural constituents by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were performed in this analysis. A dissimilar welded sample with a cooling time of 51s (18 kJ/cm) showed a substantial hardness reduction in the fine grain heat-affected zone (HAZ) of the S700MC steel side, which was between 220-240 HV5. The cause could be the increase of heat input but also the use of overmatched filler wire, which can be the result of an increase of ferrite to austenite formation in the HAZ. SEM/EDS results confirmed the increase of carbide clusters, and tempered Martensite in the CGHAZ of the S960QC side, and ferrite-bainite on the S700MC side. An increase in the presence of high carbide content and the formation of Ni, Mo, and Mn were observed on the S960QC side. The increase of carbide formation in the CGHAZ of both sides reduced the hardness and strength of the welded joints. The tensile test confirms the softening observed in the FGHAZ of the S700MC side, which caused the joint fracture on this side during the test. ","PeriodicalId":40905,"journal":{"name":"EMITTER-International Journal of Engineering Technology","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90476875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

SDN-Based Network Intrusion Detection as DDoS defense system for Virtualization Environment 基于sdn的网络入侵检测作为虚拟化环境下的DDoS防御系统

IF 0.5

EMITTER-International Journal of Engineering Technology Pub Date : 2021-12-30 DOI: 10.24003/emitter.v9i2.616

Saifudin Usman, Idris Winarno, Amang Sudarsono

引用次数: 0

Analysis of control factors and surface integrity during wire-EDM of Inconel 718 alloy using T-GRA approach 用T-GRA法分析Inconel 718合金电火花加工的控制因素和表面完整性

IF 0.5

EMITTER-International Journal of Engineering Technology Pub Date : 2021-12-30 DOI: 10.24003/emitter.v9i2.633

Md Ehsan Asgar, A. Singholi

{"title":"Analysis of control factors and surface integrity during wire-EDM of Inconel 718 alloy using T-GRA approach","authors":"Md Ehsan Asgar, A. Singholi","doi":"10.24003/emitter.v9i2.633","DOIUrl":"https://doi.org/10.24003/emitter.v9i2.633","url":null,"abstract":"In today’s competitive modern manufacturing sectors, there is a vital need of utter precision and rigorous processing using various manufacturing approaches that directly influences the cost and processing duration of mechanized materials in addition to the consistency of the finished products. Therefore, it’s essential to figure out the required output by adjusting the control factors of any machining techniques which resulted in optimal values of the desired outcome. In this study, machining evaluation and process optimization is carried out on volumetric extraction of material namely material removal rate (MRR), kerf obtained during the machining (KW) and surface roughness (SR) of Inconel 718 superalloy during CNC controlled wire- electrical discharge machining. Four controllable factors- pulse interval, wire speed, pulse duration and peak current are considered to investigate the influence on performance measures. Taguchi's L16 has been used to construct the set of experiments before physical experimental runs and most influencing factors have been evaluated using ANOVA. SEM images and EDXS analysis have been resorted to examine the morphology of Inconel 718. These findings assist in identifying the topography of the machined surface. Further, the optimum integration has been obtained for the best yield and recorded using grey relational analysis integrated with Taguchi’s technique (T-GRA). The unfamiliarity of the work is based on consideration of zinc coated thin wire electrode and Taguchi-Grey combined approach of modelling with four levels of experimental design.","PeriodicalId":40905,"journal":{"name":"EMITTER-International Journal of Engineering Technology","volume":"3 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84106908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Series Arc Fault Breaker in Low Voltage Using Microcontroller Based on Fast Fourier Transform 基于快速傅立叶变换的单片机低压串联电弧断路器

IF 0.5

EMITTER-International Journal of Engineering Technology Pub Date : 2021-12-30 DOI: 10.24003/emitter.v9i2.615

D. O. Anggriawan, Audya Elisa Rheinanda, Muhammad Khanif Khafidli, Eka Prasetyono, N. Windarko

{"title":"Series Arc Fault Breaker in Low Voltage Using Microcontroller Based on Fast Fourier Transform","authors":"D. O. Anggriawan, Audya Elisa Rheinanda, Muhammad Khanif Khafidli, Eka Prasetyono, N. Windarko","doi":"10.24003/emitter.v9i2.615","DOIUrl":"https://doi.org/10.24003/emitter.v9i2.615","url":null,"abstract":"Series Arc Fault is one of the disturbances of arcing jump is caused by gas ionization between two ends of damaged conductors or broken wire forming a gap in the insulator. Series arc fault is the primary driver of electrical fire. However, lack of knowledge of the disturbance of series arc fault causes the problem of electrical fire not be mitigated. Magnitude current is not capable to detect of series arc fault. Therefore, this paper proposes fast fourier transform (FFT) to detect series AC arc fault in low voltage using microcontroller ARM STM32F7NGH in real time. A cheap and high speed of microcontroller ARM STM32F7NGH can be used for FFT computation to transform signal in time domain to frequency domain. Moreover, in this paper, protection of series AC arc fault is proposed in the real time mode. In this experimental process, some various experiments are tested to evaluate the reliability of FFT and protection with various load starts from 1 A, 2 A, 3 A, 4 A in resistive load. The result of this experiment shows that series AC arc fault protection with STM32F7 microcontroller and FFT algorithm can be utilized to ensure series AC arc fault properly.","PeriodicalId":40905,"journal":{"name":"EMITTER-International Journal of Engineering Technology","volume":"53 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82626455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimized Graph Search Algorithms for Exploration with Mobile Robot 移动机器人探索的优化图搜索算法

IF 0.5

EMITTER-International Journal of Engineering Technology Pub Date : 2021-12-30 DOI: 10.24003/emitter.v9i2.614

Aydin Gullu, H. Kuscu

{"title":"Optimized Graph Search Algorithms for Exploration with Mobile Robot","authors":"Aydin Gullu, H. Kuscu","doi":"10.24003/emitter.v9i2.614","DOIUrl":"https://doi.org/10.24003/emitter.v9i2.614","url":null,"abstract":"Graph search algorithms and shortest path algorithms, designed to allow real mobile robots to search unknown environments, are typically run in a hybrid manner, which results in the fast exploration of an entire environment using the shortest path. In this study, a mobile robot explored an unknown environment using separate depth-first search (DFS) and breadth-first search (BFS) algorithms. Afterward, developed DFS + Dijkstra and BFS + Dijkstra algorithms were run for the same environment. It was observed that the newly developed hybrid algorithm performed the identification using less distance. In experimental studies with real robots, progression with DFS for the first-time discovery of an unknown environment is very efficient for detecting boundaries. After finding the last point with DFS, the shortest route was found with Dijkstra for the robot to reach the previous node. In defining a robot that works in a real environment using DFS algorithm for movement in unknown environments and Dijkstra algorithm in returning, time and path are shortened. The same situation was tested with BFS and the results were examined. However, DFS + Dijkstra was found to be the best algorithm in field scanning with real robots. With the hybrid algorithm developed, it is possible to scan the area with real autonomous robots in a shorter time. In this study, field scanning was optimized using hybrid algorithms known.","PeriodicalId":40905,"journal":{"name":"EMITTER-International Journal of Engineering Technology","volume":"30 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82014205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Development of A Reliability Evaluation Application for Power Plant Steam Turbine Vibrations to Predict Its Failure 电厂汽轮机振动可靠性评估系统的开发及失效预测

IF 0.5

EMITTER-International Journal of Engineering Technology Pub Date : 2021-12-30 DOI: 10.24003/emitter.v9i2.619

Moch. Faqih, Nu Rhahida Arini, Hendrik Elvian Gayuh Prasetya

{"title":"The Development of A Reliability Evaluation Application for Power Plant Steam Turbine Vibrations to Predict Its Failure","authors":"Moch. Faqih, Nu Rhahida Arini, Hendrik Elvian Gayuh Prasetya","doi":"10.24003/emitter.v9i2.619","DOIUrl":"https://doi.org/10.24003/emitter.v9i2.619","url":null,"abstract":"A steam turbine is the most critical component in a thermal power plant. Due to its crucial function, it should be maintained to be able to operate without failure. This paper aims to develop an application that can be used to analyze the reliability and synchronization of vibrations in a single evaluation through the application. The application is helpful to decide the proper time the maintenance should be performed in order to provide a better maintenance strategy. In this paper, the application was used to make an ease in evaluating the reliability and vibration of a 670 MW power plant steam turbine. The reliability was analyzed by qualitative and quantitative methods. The vibration evaluation using Fast Fourier Transform (FFT) was done by diagnosing the failure symptoms from vibration spectrum. The analysis of synchronization of vibrations conducted by comparing the vibration frequency and the natural frequency of the system which can be calculated easily using the application. The algorithm program of both evaluations was built using GNU Octave software to make a friendly user interface. From the evaluation result, the most critical components of the steam turbine are coupling, labyrinth seals, bearing, diaphragm, turbine control valve, and turbine stop valve. The maintenance interval based on the expected reliability of 90% produces the highest reliability improvement. Based on the vibration analysis, there is no failure symptoms detected in the turbine bearings. Furthermore, the dominant frequencies of vibration are distant from the natural frequency. Therefore, the steam turbine condition is acceptable to operate.","PeriodicalId":40905,"journal":{"name":"EMITTER-International Journal of Engineering Technology","volume":"42 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80881403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Plant disease prediction using convolutional neural network 基于卷积神经网络的植物病害预测

IF 0.5

EMITTER-International Journal of Engineering Technology Pub Date : 2021-12-30 DOI: 10.24003/emitter.v9i2.640

H. M S, †, Niteesha Sharma, Y Sowjanya, Ch. Santoshini, R Sri Durga, V. Akhila

{"title":"Plant disease prediction using convolutional neural network","authors":"H. M S, †, Niteesha Sharma, Y Sowjanya, Ch. Santoshini, R Sri Durga, V. Akhila","doi":"10.24003/emitter.v9i2.640","DOIUrl":"https://doi.org/10.24003/emitter.v9i2.640","url":null,"abstract":"Every year India losses the significant amount of annual crop yield due to unidentified plant diseases. The traditional method of disease detection is manual examination by either farmers or experts, which may be time-consuming and inaccurate. It is proving infeasible for many small and medium-sized farms around the world. To mitigate this issue, computer aided disease recognition model is proposed. It uses leaf image classification with the help of deep convolutional networks. In this paper, VGG16 and Resnet34 CNN was proposed to detect the plant disease. It has three processing steps namely feature extraction, downsizing image and classification. In CNN, the convolutional layer extracts the feature from plant image. The pooling layer downsizing the image. The disease classification was done in dense layer. The proposed model can recognize 38 differing types of plant diseases out of 14 different plants with the power to differentiate plant leaves from their surroundings. The performance of VGG16 and Resnet34 was compared. The accuracy, sensitivity and specificity was taken as performance Metrix. It helps to give personalized recommendations to the farmers based on soil features, temperature and humidity","PeriodicalId":40905,"journal":{"name":"EMITTER-International Journal of Engineering Technology","volume":"46 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85218785","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1