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Social and Behavioral Sciences Commons™
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Articles 31 - 41 of 41
Full-Text Articles in Social and Behavioral Sciences
Mobile Locality-Aware Multimedia On Mobile Computing Devices, Matthew D'Souza, Adam Postula, Neil Bergmann, Montserrat Ros
Mobile Locality-Aware Multimedia On Mobile Computing Devices, Matthew D'Souza, Adam Postula, Neil Bergmann, Montserrat Ros
Faculty of Engineering and Information Sciences - Papers: Part A
This paper describes the implementation of a Bluetooth Village Guide Book (VGB) scenario for use in the Kelvin Grove Urban Village located in Brisbane, Australia. An Information Point Station Network (IPSN) was developed, along with software for two types of mobile computing devices. The implementation consists of several Information Point Stations (IPSs) placed at locations of significance, with access to information items on a centralized server. Once a user is registered on the network, he/she is given the opportunity to experience context- (and eventually user-) aware information on demand and in various multimedia formats. These information items are selected by …
Eliciting And Specifying Requirements For Highly Interactive Systems Using Activity Theory, Robert B. K. Brown, Peter Hyland, Ian C. Piper
Eliciting And Specifying Requirements For Highly Interactive Systems Using Activity Theory, Robert B. K. Brown, Peter Hyland, Ian C. Piper
Faculty of Engineering and Information Sciences - Papers: Part A
The processes of eliciting user requirements and formalising these into specifications are critical for the success of highly interactive systems. These processes are still poorly understood, partly because current methods are usually ad hoc and lack any theoretical basis. A number of researchers have used Activity Theory (AT) to refine these processes and have met with some success. To date, this approach has been more useful explaining the processes post hoc. This positional paper proposes an AT method for requirement elicitation and specification definition. The method is sufficiently prescriptive and well formed that it does not require any detailed understanding …
Development And Characterization Of A High-Resolution Microspect System For Small-Animal Imaging, Yujin Qi, Benjamin Tsui, Yuchuan Wang, Brian Yoder, R Wojcik, S Majewski, A G Weisenberger
Development And Characterization Of A High-Resolution Microspect System For Small-Animal Imaging, Yujin Qi, Benjamin Tsui, Yuchuan Wang, Brian Yoder, R Wojcik, S Majewski, A G Weisenberger
Faculty of Engineering and Information Sciences - Papers: Part A
We developed a high-resolution microSPECT system and investigated its performance characteristics for small animal imaging. The microSPECT system consists of a stationary compact gamma camera with interchangeable pinhole and parallel-hole collimators and vertical object rotation mechanism. The modular camera is based on a pixellated NaI(Tl) crystal array with 1.2 mm pixel size and 1.4 mm pixel pitch coupled to a 5” diameter Hamamatsu R3292 PSPMT. The pinhole collimator has a 10cm focal length fitted with keel-edge pinhole apertures with diameters of 1.0, 1.5 and 2.0 mm. The system performance was characterized by the measurements of the point source response function …
Ozchi 2005 Doctoral Consortium Application, Robert B. K. Brown
Ozchi 2005 Doctoral Consortium Application, Robert B. K. Brown
Faculty of Engineering and Information Sciences - Papers: Part A
Formal methods of generating and specifying requirements have a chequered past when it comes to dealing with interface design. The Human Computer Interface (HCI) community have not adopted formal methods with open arms [Paterno 96]. If the accurate determination of stakeholder requirements is a significant factor in determining software project success, this thesis turns to a theory based in psychology and sociology to understand these capricious actors, the misunderstanding of whose whims can bring down 70% of software projects. This thesis will deploy Activity Theory as a basis for a proposed system design method and present initial conceptions and some …
Turbo Equalization Based On Factor Graphs, Qinghua Guo, Li Ping, Hans-Andrea Loeliger
Turbo Equalization Based On Factor Graphs, Qinghua Guo, Li Ping, Hans-Andrea Loeliger
Faculty of Engineering and Information Sciences - Papers: Part A
This paper presents a factor graph approach to turbo equalization. Unlike the existing linear MMSE turbo equalization methods, which operate with truncated windows (sliding or extending window), the proposed is a full-window approach with low complexity. This approach supports a high-speed parallel implementation technique, which makes it an attractive option in practice.
Optimized Collimator Designs For Small Animal Spect Imaging With A Compact Gamma Camera, Yujin Qi
Optimized Collimator Designs For Small Animal Spect Imaging With A Compact Gamma Camera, Yujin Qi
Faculty of Engineering and Information Sciences - Papers: Part A
The aim of this study to design optimized pinhole and parallel-hole collimators for the development of a high-resolution microSPECT system using a compact pixelleted scintillation detector. The detector has a field-of-view of 11 cm with pixellated crystal elements of 1.0 mm pixel size and 1.12 mm pixel pitch. The relative resolution and sensitivity advantages of pinhole and parallel-hole collimators for mice and rats imaging were investigated using analytic formulations and Monte Carlo simulations. The optimized collimator designs were obtained by maximizing the system detection efficiency for a given object resolution. The collimator designs were optimized for 140 keV incident gamma …
A Simple Convergence Comparison Of Gallager Codes Under Two Message-Passing Schedules, Sheng Tong, Xinmei Wang
A Simple Convergence Comparison Of Gallager Codes Under Two Message-Passing Schedules, Sheng Tong, Xinmei Wang
Faculty of Engineering and Information Sciences - Papers: Part A
The convergence rate of iterative decoding of Gallager codes on the additive white Gaussian noise (AWGN) channel using the sum-product algorithm (SPA) under the flooding schedule (FS) is compared with that under the turbo-decoding schedule (TDS). Analyses using extrinsic information transfer (EXIT) charts show that TDS exhibits a much faster convergence behavior than FS.
Box-Minus Operation And Application In Sum-Product Algorithm, S Tong, P Wang, D Wang, X Wang
Box-Minus Operation And Application In Sum-Product Algorithm, S Tong, P Wang, D Wang, X Wang
Faculty of Engineering and Information Sciences - Papers: Part A
A new formula for box-minus operation, which separates the box-minus operation into sign and reliability operations, was derived. Its application in the sum-product algorithm (SPA) was also investigated. Both box-plus operation and box-minus operation were divided into sign operation and reliability operation. The results show that on using the box-minus operation, SPA can be implemented with less decoding latency and complexity.
Cmos-Aps For Hep Applications: Design And Test Of Innovative Architectures, Alessandro Marras, Daniele Passeri, Pisana Placidi, Guido Matrella, Marco Petasecca, Leonello Servoli, Gian Mario Bilei, Paollo Ciampolini
Cmos-Aps For Hep Applications: Design And Test Of Innovative Architectures, Alessandro Marras, Daniele Passeri, Pisana Placidi, Guido Matrella, Marco Petasecca, Leonello Servoli, Gian Mario Bilei, Paollo Ciampolini
Faculty of Engineering and Information Sciences - Papers: Part A
A set of innovative active pixel architectures has been conceived and implemented in standard CMOS technology. Active circuits are introduced into the pixel, to increase S/N ratio and to perform basic signal processing. Testing of such devices, however, becomes critical, due to the circuit relative complexity and to the need of accurately evaluating timing and position of the impinging radiation. A test strategy has thus been devised, exploiting a NIR laser source, which has been carefully characterized and tuned. The NIR laser allows for emulating, in a much more controllable fashion, a MIP event. This allow for validation of novel …
A Comprehensive Numerical Simulation Of Heavily Irradiated P-Type And N-Type Silicon Detectors, Marco Petasecca, Francesco Moscatelli, Daniele Passeri, Giorgio Umberto Pignatel, Carlo Scarpello, Giovanni Caprai
A Comprehensive Numerical Simulation Of Heavily Irradiated P-Type And N-Type Silicon Detectors, Marco Petasecca, Francesco Moscatelli, Daniele Passeri, Giorgio Umberto Pignatel, Carlo Scarpello, Giovanni Caprai
Faculty of Engineering and Information Sciences - Papers: Part A
In the framework of the CERN-RD50 Collaboration, the adoption of p-type substrates has been proposed as a suitable mean to Improve the radiation hardness of silicon detectors up to fluences of 1016n/cm2. In this work the simulated electrical characteristics of Irradiated p-type and n-type detectors are reported, for comparison with experimental measurements collected from the literature. The behaviour of the silicon devices at a fluence of 1016n/cm2 shows better results In term of charge collection efficiency using a p-type silicon detector.
Advanced Active Pixel Architectures In Standard Cmos Technology, Alessandro Marras, Daniele Passeri, Guido Matrella, Pisana Placidi, Marco Petasecca, Leonello Servoli, Gian Mario Bilei, Paolo Ciampolini
Advanced Active Pixel Architectures In Standard Cmos Technology, Alessandro Marras, Daniele Passeri, Guido Matrella, Pisana Placidi, Marco Petasecca, Leonello Servoli, Gian Mario Bilei, Paolo Ciampolini
Faculty of Engineering and Information Sciences - Papers: Part A
This paper aims at exploring and validating the adoption of standard fabrication processes for the realization of CMOS active pixel sensors, for particle detection purposes. The goal is to implement a single-chip, complete radiation sensor system, including on a CMOS integrated circuit the sensitive devices, read-out and signal processing circuits. A prototype chip (RAPS01) based on these principles has been already fabricated, and a chip characterization has been carried out; in particular, the evaluation of the sensitivity of the sensor response on the actual operating conditions was estimated, as well as the response uniformity. Optimization and tailoring of the sensor …