This paper considers a resource allocation problem in the downlink of a multiuser, multicell OFDM cellular network with frequency selective fading and imperfect channel state information. Each user has a given data rate requirement. The task is to determine power and subcarrier allocations for users to ensure that users’ outage probabilities are low. A two-layer approach is used. The higher lay...

Requirements engineering is a critical task in the construction of correct computer systems. It is not however a certain task, and it causes serious problems in computer systems. This is due to the existence of a gap between users and the development process introduced by a manual interpretation of their needs. In order to ascertain an accurate translation from users requirements to spec-iicati...

In this paper we present an accessibility analysis framework for the specification of Web accessibility evaluation scenarios that differentiates the requirements of users with disabilities, in order to achieve personalised accessibility assessment. We apply this framework to evaluations of Web Accessibility (e.g., WCAG 2.0 conformance) and to usability evaluations with users with disabilities. ...

There has been intense effort in the past decade on developing multiuser receiver structures which mitigate interference between users in spread-spectrum systems. While much of this research is performed at the physical layer, the appropriate power control and choice of signature sequences in conjunction with multiuser receivers and the resulting network user capacity is not well understood. In...

There has been little research on end-user program development beyond the programming phase. Devising ways to address additional phases may be critical, because research shows that over one-half of the programs written by end users, at least in the widely used spreadsheet paradigm, contain errors. In this paper, we investigate whether providing end users with integrated support for requirement ...

This study analyzes mobile phone data derived from 10 million daily active users across the United States to better understand the spatio-temporal activity patterns of users in Central Park, New York. The aim of this initial investigation is to create quantifiable measures for understanding public space usage in regions of the city that have no natural data source for measuring activity. We ana...

We prove that for any positive integers n and k such that n≥ k≥ 1, there exists an [n, k] generalized Reed-Solomon (GRS) code that has a sparsest and balanced generator matrix (SBGM) over any finite field of size q ≥ n+ ⌈ k(k−1) n ⌉, where sparsest means that each row of the generator matrix has the least possible number of nonzeros, while balanced means that the number of nonzeros in any two c...

the present research was conducted to estimate the dietary lysine (lys) requirement of growing female quail base on performance and carcass constitutes at 24 to 42 d of age. a dose-response diet mainly based on corn, corn gluten and soybean meal was used. lys content was minimized in dose-response diet (10 g/kg) while assuring the minimum levels of all other essential amino acids in a manner th...

Cognitive radio (CR) can successfully deal with the growing demand and scarcity of the wireless spectrum. To exploit limited spectrum efficiently, CR technology allows unlicensed users to access licensed spectrum bands. Since licensed users have priorities to use the bands, the unlicensed users need to continuously monitor the licensed users’ activities to avoid interference and collisions. How...

April 1999 Identifying Requirements – How Will I Know One When I See One? Requirements begin their lives when first elicited from customers or users. Elicitation may occur using any of a variety of techniques such as interviews, brainstorming, prototyping, questionnaires, and quality function deployment or techniques. Typically, requirements start out abstractly, e.g., “I need a system that con...