Student Conference on Research and Development
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Đo lường không gian tự do của độ permittivity phức và độ từ thẩm phức của vật liệu từ sử dụng phương pháp mạch hở và mạch ngắn tại tần số vi sóng Dịch bởi AI
- Trang 394-398
Để đo lường các vật liệu dielectrics, chúng tôi đã phát triển một hệ thống đo lường không gian tự do trong khoảng tần số từ 8 - 12,5 GHz. Các thành phần chính của hệ thống đo lường gồm có một cặp ăng-ten giác hội tụ hình phễu, máy phân tích mạng và cáp đồng trục. Trong dự án này, mục tiêu là phân tích và đo lường các hệ số phản xạ phức tạp của các vật liệu dielectrics như các tấm cao su silicon tả...... hiện toàn bộ
#Microwave circuits #Magnetic circuits #Extraterrestrial measurements #Permeability #Magnetic materials #Microwave frequencies #Dielectric measurements #Antenna measurements #Permittivity measurement #Frequency measurement
Strategy to improve the indoor coverage for mobile station
- Trang 410-413
This paper presents an evaluation of whether the indoor signal strength for commercial buildings fulfills the cell planning requirement. In order to provide high quality cellular service, it is necessary to place an array of distributed antennas connected using feeder cable within the building. With the feeder cable approach, splitters and computer software, we develop using Visual Basic 6.0. The ...... hiện toàn bộ
#Enterprise resource planning #Power cables #Land mobile radio cellular systems #Land mobile radio #Floors #Building materials #Directive antennas #Antenna radiation patterns #Antenna arrays #Antenna feeds
Adaptive noise cancellation: a practical study of the least-mean square (LMS) over recursive least-square (RLS) algorithm
- Trang 448-452
This paper analyses two types noise cancellation algorithms (i.e. the least-mean square (LMS) algorithm and the recursive least-squares (RLS) algorithm) and tries to outlines their strengths and their weaknesses. We have implemented these algorithms in a "semi-hardware" fashion, using a microphone, two loudspeakers and a Sound Blaster sound card and the data from this hardware is processed via sof...... hiện toàn bộ
#Noise cancellation #Least squares approximation #Acoustic noise #Microphones #Resonance light scattering #Loudspeakers #Speech #Telephony #Tiles #Transversal filters
Channel management for WATM mobile satellite systems
- Trang 386-389
This paper presents a dynamic channel allocation scheme for wireless asynchronous transfer mode (WATM) satellite systems. Handoff schemes of WATM are utilized to deal with handoff issues in a WATM mobile satellite system. Here we investigate and simulate a dynamic channel allocation scheme for handoff in WATM mobile satellite networks, which improves the network resource utilization, by measuring ...... hiện toàn bộ
#Asynchronous transfer mode #Low earth orbit satellites #Routing #Channel allocation #Resource management #Artificial satellites #Personal communication networks #Satellite ground stations #Roaming #Systems engineering and theory
Radio resource and mobility management in GPRS network
- Trang 132-135
The General Packet Radio Service (GPRS) is a complex data network which upgrades current second generation GSM networks, offering true high-speed Internet (IP) and X.25 network connectivity over existing GSM cellular networks. The key benefits of GPRS are better use of radio and network resources and completely transparent IP support. The increasing population of mobile users leads to congestion p...... hiện toàn bộ
#Mobile radio mobility management #Ground penetrating radar #Radio spectrum management #Resource management #GSM #Packet radio networks #IP networks #Web and internet services #Land mobile radio cellular systems #Delay
Safety and performance compliance test of an infant incubator
- Trang 35-39
This paper describes the various aspects of safety and performance of a specific commercial infant incubator and its compliance with the set requirements and regulations according to IEC 601-1 and IEC 601-2-19. The qualitative and the quantitative tests of electrical safety have been carried out. In the electrical test, the grounding resistance, leakage current, line voltage, temperature control, ...... hiện toàn bộ
#Circuit testing #Pediatrics #IEC standards #Fasteners #Inspection #Biomedical engineering #Electrical safety #Thermostats #Safety devices #Grounding
Mathematical analysis of network traffic
- Trang 249-252
The level of complexity in computer networks is rising and the mathematics needed to model the network traffic behaviour is not an exact science. This paper aims to bridge the gap between mathematics and engineering by illustrating some of the problems that exist with conventional traffic modeling, and show how to obtain informative network statistics via mathematical tools such as the Hurst (1951...... hiện toàn bộ
#Mathematical analysis #Telecommunication traffic #Traffic control #Mathematics #Mathematical model #Computer networks #Bridges #Statistics #Autocorrelation #Protocols
Improving productivity and efficiency of a vehicle seat assembly line in a manufacturing company
- Trang 94-97
This project is carried out to improve the productivity and efficiency of a vehicle seat assembly line in a local automotive vehicle part manufacturer. The existing vehicle seat assembly line is studied first using a line balancing and simulation approach. The data collected from the existing line are operating time and processes, material handling system, workstation layout and equipment and bill...... hiện toàn bộ
#Productivity #Vehicles #Manufacturing #Automotive engineering #Production #Workstations #Torque #Assembly systems #Standards development #Manufactured products
Virtual reality on the WWW: simulating class I procedures in restorative dentistry
- Trang 360-363
The World Wide Web (WWW) is a very efficient way for information exchange. Advancement in Web technology now permits visualisation software to be shared across the Internet. This paper discusses the design and prototype development of a Web-based VR to create an interactive-simulation for the procedure of a Class I cavity preparation in restorative dentistry. The aim of this research is to find ou...... hiện toàn bộ
#Virtual reality #World Wide Web #Dentistry #Teeth #Web sites #Application software #Shape #Technological innovation #Diseases #Computer science education
Energy storage system to improve power quality and system reliability
- Trang 8-11
This paper embodies work at the Hong Kong Polytechnic University on the application of energy storage in general and BESS in particular to improve power quality and system reliability. This paper discusses the hardware configuration and the control strategy being used to implement the above objectives when a battery energy storage system is connected to the grid. The proposed three-phase multi-pur...... hiện toàn bộ
#Energy storage #Power quality #Power system reliability #Power systems #Uncertainty #Electricity supply industry #Demand forecasting #Power generation #Economic forecasting #Control systems