Simulation of a 41-level inverter built by cascading two symmetric cascaded multilevel inverter

The main disadvantage for cascaded multilevel inverter is the high number of switching device it needs in an installation. To reduce total harmonics distortion (THD) of the output waveform, the number of output voltage level has to be increased, hence the higher number of switching devices. This consequently increases the installation cost, inverter size and voltage losses at the load terminals. In this paper a new cascaded multilevel inverter concept is proposed with a small number of switching devices and dc sources needed. The 41-level inverter consist of several high voltage and low voltage dc sources. The switching strategy of the inverter is the low voltage dc sources are switched in several times in a half cycle of the output. The 41-level cascaded multilevel inverter operation is then demonstrated by the Matlab simulation

A single DC source 41-level 115V, 400Hz cascaded multilevel inverter

Cascaded multilevel inverters are popular in fields such as oil and gas, power supply installations, and power quality devices. While there are many advantages of the cascaded multilevel inverter, its main disadvantage is the need for large numbers of multiple dc sources. In order to reduce total harmonics distortion (THD) of the output voltage waveform, the amount of output voltage level must be increased, hence the higher number of dc sources. This essentially complicated the inverter design, as most converter transform only one voltage source to another. In this paper a cascaded multilevel inverter topology with a single dc source is discussed. The topology is based on capacitors instead of cells as the multiple voltage sources. The cascaded multilevel inverter topology validity and functionality is verified by the Matlab Simulink simulation of a 100W and 1kW aircraft single phase 41-level inverter

Voltage notch analysis of a taps-based multilevel inverter in the event of one switch failure

There are many advantages of the cascaded multilevel inverter such as low voltage stress for each switching device and higher power quality. One of the drawbacks for this type of inverter is the series switching of the cells it used in its operation. In order to properly operate, all switches must be operational; failure of only one of the switches will result in the failure of the inverter operation. This can be clearly seen in the case of cascaded H-bridge multilevel inverter and other topologies derived from it. In this paper a series cascaded cells taps-based multilevel inverter topology with a minimum number of switching devices and driver circuits needed is discussed. The voltage taps-based topology also needs to turn on only three switching devices at any operation time for any output voltage level configurations. The failure of one of the switches on this topology does not cause total malfunction of the inverter, instead it only causes voltage notches to form on the resulting sine wave output. The notch effect is verified by the experimental results of a prototype single phase 41-level inverter

Designing a Production-oriented Approach-Based Mobile-Assisted Interpreting Learning Module Using Fuzzy Delphi Method

This research addresses a significant gap in the field of interpreting education. While interpreting is widely acknowledged as a complex language skill, it has received minimal attention in educational research. Despite the advancements in language education, mobile-assisted learning has gained popularity as an effective teaching method. However, it remains largely unexplored in interpreting education. This study stands out by introducing a novel mobile-assisted interpreting learning (MAIL) module based on the productionoriented approach, which combines mobile technology with language learning. To ensure the credibility of the module, a fuzzy Delphi method (FDM) involving fifteen experts was employed. This method resulted in a strong consensus on the elements, objectives, content, procedure, and design of the mobile device. Notably, 37 out of the 39 elements received unanimous approval from the experts. The final output is a practical and implementable module called production-oriented approach-based mobile-assisted interpreting learning (POMAIL). It includes a clear flowchart designed for educators and researchers. This research makes a significant contribution to the field of education by providing valuable guidance in mobile-assisted learning and language education. It has the potential to reshape the field

Endovascular Stenting in Superior Vena Cava Syndrome: A Systematic Review and Meta-analysis

PURPOSE: Endovascular stenting has been used to manage superior vena cava syndrome for several decades and has become standard firstline practice. This study aims to investigate the outcomes of endovascular stenting in the management of superior vena cava syndrome (SVCS). METHODS: MEDLINE, EMBASE and PUBMED online databases were searched, with studies involving more than ten adult patients included. Studies identified spanned 27 years, from 1993 to 2020. Meta-analyses were performed based on Clopper-Pearson estimation. RESULTS: Fifty-four studies were identified, for a total of 2249 patients, of which 2015 had malignant SVCS and 222 benign SVCS. Pooled technical success and clinical success rates were 96.8% (95% CI 96.0-97.5%) and 92.8% (95% CI 91.7-93.8%). Technical success and clinical success rates for studies investigating benign SVCS alone were identical at 88.8% (95% CI 83.0-93.1%). Pooled patency remained above 90% for the first year. Average complication and re-intervention rates were 5.78% (SD = 9.3182) and 9.11% (SD = 11.190). CONCLUSIONS: This review confirms the effectiveness of endovascular stenting in managing SVCS. Further directions of research may include specific outcomes of endovascular stenting in benign SVCS, and the impact of procedural characteristics, such as the use of anticoagulation and type of stent used, on outcomes. LEVEL OF EVIDENCE: Level III, systematic review of retrospective cohort studies

The analysis and implementation of remote production monitoring system in manufacturing industries

The emergence of the fourth industrial revolution (IR4.0) turns manufacturing process into digital environment. In this transition, new technology especially the Internet of Things (IoT) play an important part in the global market rivalry. In order to shift manufacturing companies to the Internet of Things, it is crucial to connect their activities to the digital world using smart sensor systems. To overcome with this problem, this project presents a remote monitoring system for shop-floor and based on the IoT standard. This project is also about analyzing and developing a Remote Production Manufacturing System (PMS) framework and online tool condition monitoring system according to the Internet of things requirements (IR 4.0). The system is designed to establish a data acquisition and monitor the production shop floor remotely. For further processing, visualization and analyses, the monitored data are transferred to a cloud server using MDC�MAX solution. The developed system follows the IoT model to connect physical manufacturing with the cyber world and offer integration capabilities with existing industrial manual systems. Monitoring device installation is validated using a CNC milling machine on an industrial laboratory shop floor

Penilaian kepuasan perkhidmatan pendidikan TVET berdasarkan bangsa di universiti awam Malaysia

Permintaan pasaran pekerjaan kini mengehendaki pekerja yang berdaya saing dan berkemahiran.Justeru itu, institusi pendidikan memainkan peranan penting dalam menawarkan perkhidmatan pendidikan yang benar-benar berkualiti untuk melatih sumber modal manusia mengikut keperluan pasaran.Oleh itu, pendekatan kajian kuantitatif dijalankan bertujuan untuk meninjau kualiti perkhidmatan pendidikan yang ditawarkan kepada pelajar bidang TVET di IPTA.Kajian ini menggunakan reka bentuk kajian tinjauan keratan rentas silang dan instrumen soal selidik digunakan sebagai kaedah pengumpulan data.Borang soal selidik terdiri daripada dua bahagian iaitu Bahagian A: Profil responden dan Bahagian B: Kualiti perkhidmatan pendidikan. Kajian rintis dijalankan melibabkan 50 responden yang mempunyai ciri-ciri yang hampir sama dengan populasi kajian. Kebolehpercayaan instrumen, penyelidik merujuk kepada nilai ketekalan dalaman alfa Cronbach kualiti perkhidmatan institusi pengajian pada nilai alfa Cronbach =0.887 dan kualiti perkhidmatan latihan dan amali pada nilai alfa Cronbach = 0.918. Analisis data yang dilibatkan secara deskriptif iaitu min, peratusan dan sisihan piawai.Sementara analisis inferensi pula melibatkan pengujian MANOVA.Hasil dapatan menunjukkan bahawa tahap kepuasan perkhidmatan pendidikan dalam kalangan pelajar TVET di IPTA adalah sederhana.Dapatan juga menunjukkan terdapat perbezaan yang signifikan kualiti perkhidmatan pendidikan berdasarkan demografi bangsa.Hasil dapatan kajian ini jelas membuktikan bahawa wujud perbezaan kepuasan perkhidmatan pendidikan dalam kalangan pelajar TVET di IPTA berdasarkan demografi bangsa yang boleh diteroka secara mendalam melalui pendekatan kualitatif

PERANCANGAN SISTEM INFORMASI AKADEMIK MOBILE DENGAN SCRUM FRAMEWORK

A mobile application-based academic information system is an information system that provides academic information for students and lecturers that can be accessed from mobile devices from anywhere. With the existence of a mobile application-based academic information system, students and lecturers can be given alternatives to carry out academic activities on an online academic information system from mobile devices so as to provide convenience and flexibility. The research method was carried out by conducting interviews with lecturers and several students to obtain information about the needs of the academic information system. Meanwhile, the system designer's method uses the Scrum. Scrum is a framework that is suitable to be implemented in making academic information systems because Scrum is used in a work context that is quite complicated where cases cannot be predicted. The result of the implementation is that some of the information in the academic information system that can be accessed is the siakad login page, the siakad dashboard, and others so that it can maximize academic activities which of course can also make it easier for students and lecturers to get services and information about academic matters

KEPUASAN PELAJAR TERHADAP PERKHIDMATAN PENDIDIKAN TEKNIKAL DAN LATIHAN VOKASIONAL (TVET) DI RANGKAIAN UNIVERSITI TEKNIKAL MALAYSIA

Modal manusia berpengetahuan dan berkemahiran merupakan indikator penggerak kepada perkembangan ekonomi negara. Justeru itu, institusi pendidikan memainkan peranan penting dalam penyediaan perkhidmatan pendidikan untuk melahirkan produk modal manusia seperti mana yang dikehendaki oleh industri. Tujuan kajian dijalankan adalah untuk membuat penilaian perkhidmatan pendidikan dalam kalangan pelajar aliran Pendidikan dan Latihan Teknikal dan Vokasional (TVET) di IPTA dalam aspek penerimaan dan perbandingan kepuasan perkhidmatan pendidikan berdasarkan demografi jantina. Populasi kajian yang dilibatkan seramai 6252 orang pelajar dengan saiz sampel seramai 448 sampel. Kajian ini melibatkan kaedah pensampelan rawak berstrata dengan menggunakan instrumen soal selidik sebagai kaedah pengumpulan data. Kebolehpercayaan instrumen adalah baik pada nilai alfa Cronbach = 0.887 bagi kualiti perkhidmatan institusi pengajian dan nilai alfa Cronbach = 0.918 bagi kualiti perkhidmatan latihan dan amali. Analisis deskriptif yang dilibatkan adalah min, peratusan dan kekerapan manakala analisis inferensi melibatkan pengujian MANOVA sehala. Hasil dapatan menunjukkan tahap kepuasan perkhidmatan pendidikan yang sederhana dan tidak terdapat perbezaan yang signifikan kepuasan perkhidmatan pendidikan berdasarkan demografi jantina. Penemuan kajian jelas menunjukkan bahawa IPTA perlu meningkatkan keberkesanan pelaburan dalam perkhidmatan pendidikan yang ditawarkan dalam usaha mempromosikan pendidikan tinggi di negara ini.   Kata kunci: Jantina, kepuasan perkhidmatan pendidikan, pendidikan tinggi, penilaian, TVET   ABSTRACT A knowledgeable and skilled human capital is a driving indicator of the country's economic development. Hence, educational institutions play an important role in the provision of educational services to produce human capital products as required by industry. The purpose of the study was to evaluate the educational services among Technical Vocational Education and Training (TVET) university students in terms of acceptance and delivery satisfaction based on gender demographic. The study population involved 6,252 students with a 448 sample size. This study involved random stratified method, and questionnaires were used to collect data. The reliability of the instrument is good as Cronbach's alpha value = 0.887 for the quality of the institution's services and the alpha value of Cronbach = 0.918 for the training and practical service quality. Descriptive analysis involved mean, percentage and frequency while inference analysis involved one-way MANOVA testing. The finding shows that the level of satisfaction of education services is moderate and there is no significant difference in satisfaction of educational services based on gender demographic. The findings clearly show that the universities need to increase the effectiveness of investment in education services offered in the efforts to promote higher education in the country.   Keywords: Assessment, education services satisfaction, gander, higher education, TVET   Cite as: Abd Majid, M. Z., Hussin, M., & Norman, M. H. (2019). Kepuasan pelajar terhadap perkhidmatan pendidikan teknikal dan latihan vokasional (TVET) di rangkaian universiti teknikal Malaysia [Learner satisfaction of service quality in technical vocational education and training (TVET) in Malaysian technical universities]. Journal of Nusantara Studies, 4(2), 410-428. http://dx.doi.org/10.24200/jonus.vol4iss2pp410-42