The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Multicast enables efficient large-scale content distribution and has become more and more popular in network service. Security is a critical issue for multicast because many applications require access control and privacy. This issue is more sensitive to wireless network, which is lack of physical boundaries. IEEE 802.16 is the standard for next generation wireless network, which aims to provide the...
This paper describes the design and testing of a device that employs pre-built IEEE 802.11b wireless cards in a real-time audio application. IEEE 802.11b WiFi cards have been used for high data rate applications where latency is not of primary concern. The main goal was to investigate if IEEE 802.11b would be capable of handling the type of load created by audio transmission. The application for this...
Ad hoc network is often local area network or other small area network formed by wireless devices. In Latin, ad hoc literally means "for this," further meaning "for this purpose only," and thus usually temporary. The area of ad hoc networking has gathered much research interests in the past years. Bluetooth is one of the technologies that can be used for ad hoc networking. The...
Largely because of the complex nature of wireless communications research, academia has been slow to respond to strong industry and government demands for trained professionals to develop and apply novel wireless techniques to the rapidly-growing demand. There is a high demand for professionals with a background in wireless. Wireless engineers and scientists are needed to analyze, index, represent,...
Summary form only given. Since its inception in the mid 1990's Java has steadily gained acceptance by programmers, supplanting both C and C++ as the language of choice. NASA chose to use Java for processing Mars mission data because of increased productivity by their programmers. Other companies cite Java's portability, robustness, and well defined APIs as reasons for change. The December 2006 TIOBE...
Businesses face increasing expectations from a global market requiring new services that fit consumers' immediate needs with a high degree of reliability, scalability and performance. Traditional architectures can sometimes have trouble meeting these expectations, so more fault-tolerant architectures are needed to fulfil these needs. This article introduces the concept of computer clustering for a...
Security issues in the data link layer have not received much attention while network security problems have been studied and addressed in the application, transport, and network layers. This paper proposes a new security inter-layering approach to secure the data link layer in Internet protocol (IP) over Ethernet networks. In the data link layer, the authors propose to utilize secure namespaces instead...
This paper presents an approach to model the current gain in SiGe DHBTs, by using the fitting coefficients to modify the model parameters of Si BJTs in OrCAD PSPICE. The effect of dynamic retarding potential barrier at base-collector heterojunction in SiGe DHBTs is also modeled by using a resistor in parallel with internal base resistance RB.
Optical power degradation in AlGaN-based deep-UV LEDs treated with low pressure O2-plasma treatment is reported. This process was performed prior to the metallization of p-type contacts, with and without transparent layer using disk-LEDs geometry. Following the rapid thermal annealing (RTA) of Ti/Al/Ti/Au, (n-contact) and Ni/Au, (p-contact), their current-voltage characteristics were analyzed. A significant...
Variable frequency microwave (VFM) curing of polymer dielectrics can reduce process time compared to conventional thermal methods drastically without compromising intrinsic material properties. However, the interactions that occur during VFM curing are not well understood. This paper presents a statistical experimental design to determine the significance of VFM processing parameters. A D-optimal...
This paper reports on the development of a polymeric microfluidic multiplexer, which can be applied to perform a variety of functions involving liquid manipulation and control in microfluidics devices/systems, portable biosensors, and other miniaturized systems. The developed device was applied for 1times8 multiplexing of a test liquid, i.e., the test liquid was injected into the device through one...
As the Internet becomes more mature and a part of our daily life, technologies used to provide continuous services of the Internet under all circumstances become more crucial. Collectively, these technologies ensure that resources are always available and stable. Since network attack is very easy to deploy and has very low cost, it has become the main reason of network instability and is the most...
The accurate modeling of error sequences that occur in wireless channels is necessary for a better understanding of network performance and for improving the design of communication system under study. Hidden Markov models are widely used for simulating such error traces produced by wireless channels. The primary advantage of using these models is rapid experimentation and prototyping. Although the...
In this article, Huffman's idea has been extended to higher dimensions and magnitudes with greater redundancy (minimum to maximum) in the development of a new communication code. In this code, both coding and decoding are easier in comparison with Huffman code.
A novel CBR CR protocol (with fundamental theories and postulates for this protocol) based on the previously proposed user-group-division method is presented here. The CR protocol is used with a divided CBR network MAC protocol that initially divides the network into groups of users, and then continuously re-distributes and regroups the data slot (ds) and contention mini-slot (cms) resources depending...
Summary form only given. Bluetooth is being envisioned simply as a wire replacement technology. Its most commonly described application is that of a "cordless computer" consisting of several devices including a personal computer, possibly a laptop, keyboard, mouse, joystick, printer, scanner, etc., each equipped with a Bluetooth card. There are no cable connections between these devices,...
An experimental study of the comparative performance of a real-life HTML application and an AJAX application that implement the same user interface was done. Data was collected on the performance of each when presented with the same tasks. Response size and service time performance measures were computed for the applications. AJAX provided significant performance improvements in response size (56%),...
XML (Extensible Markup Language) is an amazingly powerful tool that is widely used for exchanging data files over the Internet and more generally for describing structured documents. This paper describes a novel application of XML to represent the active processing associated with a computer-assisted interview in addition to representing the structure, content, and format of the questionnaire. This...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.