ppxscal/embedding_network huggingface dataset:
A Conceptual Model of e-Government Acceptance in Public Sector
Authors: Sinawong Sang, Jeong-Dong Lee
Venue: Proceedings of the 2009 Third International Conference on Digital Society (2009)

The purpose of this paper is to develop a conceptual model for e-Government acceptance in public sector which is one of the least studied aspects of e-Government. The proposed model uses theories from technology acceptance and success and the diffusion of ICT-related innovations. It integrates constructs from the Technology Acceptance Model (TAM), the theoretical extension of the TAM (TAM2), the Diffusion of Innovation (DOI), the Updated DeLone and McLean (D&M) IS Success Model, trust and risk literature, to explain and analyze the factors influencing public officers’ acceptance of e-Government services. The conceptual model, as well as providing a foundation for further empirical testing, will have some practical issue to government decision makers as it synthesizes much of the current research regarding to e-Government acceptance into a single model. It will have important policy and strategy implications for helping government in increasing public officers’ acceptance of e-Government usage.
A Medium Access Control of Prioritized Contention Access in Ultra Wide Band Home Networks
Authors: Jin Tian
Venue: Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 02 (2009)

Wireless Personal Area Networks (WPANs) are becoming a popular way of networking computer equipments in the home and office. In order to support differentiated Quality-of-Service (QoS) in WPANs, the ECMA-368 Prioritized Contention Access (PCA) protocol allocates multiple Access Categories (ACs) with different priorities, inter-frame spaces, and contention window sizes. This paper presents an improved Medium Access Control (MAC) scheme to enhance the QoS of WPANs based on the idea of using the different increasing functions for each AC to enlarge the size of contention window in the case of transmission collision. The performance of this improved scheme under multimedia applications is extensively investigated and compared with the original ECMA-368 PCA using the well-known network simulator NS-2. The results show that this scheme is able to achieve higher throughput and medium utilization than the original ECMA-368 PCA. Moreover, it provides a good prioritization level between multiple ACs.
Blind identification of digital communication signals based on statistics of directional data
Authors: Lu Man-jun, Zhan Yi, Si Xi-cai, Yang Xiao-niu
Venue: Proceedings of the 2008 International Conference on Advanced Infocomm Technology (2008)

This paper presents a new clustering algorithm to solve the blind identification problem of digital communication signal modulation types. the algorithm utilized the instantaneous frequency and instantaneous phase of sampling circular statistical data as a training sample to extract classification feature based on the statistical theory of directional data. And use the characteristic parameters to achieve a variety of different types of communication signals in the modulation recognition on the two-dimensional plane. This method is not only able to make identification classes, but also to achieve recognition subclasses. Simulation results show that the algorithm simple and efficient, and high in accuracy, robustness better and has strong practicality and feasibility.
Watermarking, a Mature Technology --- Retrospect and Prospect
Authors: Bede Liu
Venue: Proceedings of the 6th International Workshop on Digital Watermarking (2008)

Digital Watermarking has been proposed to manage digital rights, for authentication, to recover lost information, to monitor performance, and other applications. The efforts of many researchers from different disciplines have helped us to understand the basic issues and the challenges, and to help guiding the community toward actual applications. As digital watermarking matures as a technology, it is time to review what has been accomplished and to speculate what may be expected. In this talk, we will try to highlight the key development in digital watermarking, to examine the effectiveness in some applications, and to offer some thoughts regarding future development of digital watermarking. The ACM Portal is published by the Association for Computing Machinery. Copyright © 2010 ACM, Inc. Terms of Usage Privacy Policy Code of Ethics Contact Us Useful downloads: Adobe Acrobat QuickTime Windows Media Player Real Player
In support of city exploration
Authors: Ben Bedwell, Holger Schnädelbach, Steve Benford, Tom Rodden, Boriana Koleva
Venue: Proceedings of the 27th international conference on Human factors in computing systems (2009)

The novel experience Anywhere allowed participants to explore an urban area, tying together information not normally available, new points of views and interaction embedded into physical places. Guided by 'unseen', on-the-street performers in an ongoing conversation maintained over mobile phones, they gained access to locative media and staged performances. Our analysis demonstrates how Anywhere produced engaging and uniquely personalised paths through a complex landscape of content, negotiated by the performer-participant pair around various conflicting constraints. We reflect our analysis through the lens of the key characteristics exhibited by mechanisms that support city exploration, before focussing on possible extensions to the technological support of teams of professional and amateur guides.
Computing discrete transforms on the Cell Broadband Engine
Authors: David A. Bader, Virat Agarwal, Seunghwa Kang
Venue: Parallel Computing (2009)

Discrete transforms are of primary importance and fundamental kernels in many computationally intensive scientific applications. In this paper, we investigate the performance of two such algorithms; Fast Fourier Transform (FFT) and Discrete Wavelet Transform (DWT), on the Sony-Toshiba-IBM Cell Broadband Engine (Cell/B.E.), a heterogeneous multicore chip architected for intensive gaming applications and high performance computing. We design an efficient parallel implementation of Fast Fourier Transform (FFT) to fully exploit the architectural features of the Cell/B.E. Our FFT algorithm uses an iterative out-of-place approach and for 1K to 16K complex input samples outperforms all other parallel implementations of FFT on the Cell/B.E. including FFTW. Our FFT implementation obtains a single-precision performance of 18.6 GFLOP/s on the Cell/B.E., outperforming Intel Duo Core (Woodcrest) for inputs of greater than 2K samples. We also optimize Discrete Wavelet Transform (DWT) in the context of JPEG2000 for the Cell/B.E. DWT has an abundant parallelism, however, due to the low temporal locality of the algorithm, memory bandwidth becomes a significant bottleneck in achieving high performance. We introduce a novel data decomposition scheme to achieve highly efficient DMA data transfer and vectorization with low programming complexity. Also, we merge the multiple steps in the algorithm to reduce the bandwidth requirement. This leads to a significant enhancement in the scalability of the implementation. Our optimized implementation of DWT demonstrates 34 and 56 times speedup using one Cell/B.E. chip to the baseline code for the lossless and lossy transforms, respectively. We also provide the performance comparison with the AMD Barcelona (Quad-core Opteron) processor, and the Cell/B.E. excels the AMD Barcelona processor. This highlights the advantage of the Cell/B.E. over general purpose multicore processors in processing regular and bandwidth intensive scientific applications.
Keyword search considering user's preference in P2P networks
Authors: Tomomi Miyazaki, Toshiki Watanabe, Akimitsu Kanzaki, Takahiro Hara, Shojiro Nishio
Venue: Proceedings of the 3rd International Conference on Ubiquitous Information Management and Communication (2009)

When a user searches data in a P2P network, it is general to use a keyword-search, which acquires data items whose keywords match keywords the user specified. In a naive keyword-search strategy, however, users usually get a large number of data items regardless whether they actually need these data items or not because this strategy returns data items without considering the user's preference. In this paper, we propose a novel search strategy considering user's preference in P2P networks. In our strategy, each peer predicts the user's preference based on keywords featured in the data items. When searching, a peer appends some additional keywords representing the user's preference to the query in addition to the keyword that the user specifies. Peers which receive the query calculate the similarity between their holding data items and the information on the user's preference appended by the query sender. As a result, if the similarity is high, the peer returns its holding data items whose keywords match the received query. Thus, users can avoid getting unnecessary data items. In addition, each peer learns the user's preference using keywords featured in data items that the user accesses.
Research on Mobility Management in DDQP Mechanism of SUPANET
Authors: Yu Gao, Huaxin Zeng, Haiying Wang
Venue: Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 03 (2009)

High-speed switching, QoS provisioning, security, and mobility are main challenges faced with existing networks and to be confronted by NGN researchers and developers. To address these challenges, SUPANET has been proposed in recent years. But all works on SUPANET have been mainly devoted to high-speed switching and QoS issues, so far, there is no research on the mobility management of SUPANET. To support QoS and mobility simultaneously, a new QoS support mechanism called Differentiated Dynamic QoS Provisioning (DDQP) based on SUPANET has been proposed. To address the mobility problem in DDQP mode, this paper researched the mobility management procedure integrated with MIPv6. Furthermore, an FMIPv6 based QoS-aware handover scheme has been proposed to reduce handover latency and reserve timeslots earlier.
DREP: A Requirements Engineering Process for Dependable Reactive Systems
Authors: Sadaf Mustafiz, Jörg Kienzle
Venue: Methods, Models and Tools for Fault Tolerance (2009)

Discovering and documenting potential abnormal situations and irregular user behavior that can interrupt normal system interaction is of tremendous importance in the context of dependable systems development. Exceptions that are not identified during requirements elicitation might eventually lead to an incomplete system specification during analysis, and ultimately to an implementation that lacks certain functionality, or even behaves in an unreliable way. This paper presents a requirements engineering process, DREP, that systematically guides the developer to consider reliability and safety concerns of reactive systems. After the discovery of normal system behavior by means of use cases, the developer is lead to explore exceptional situations arising in the environment that change the context in which the system operates and service-related exceptional situations that threaten to fail user goals. The process requires the developer to specify means that detect such situations, and to define the recovery measures that attempt to put the system in a reliable and safe state. The process is iterative, and refinements are carried out, if necessary, to achieve desired quality levels. To conclude the requirements phase, an extended use case diagram summarizes the normal interactions, exceptions, handlers and their relationships. The proposed process is demonstrated with the 407 Express Toll Route System case study.
Development of an epitaxial lift-off technology for II-VI nanostructures using ZnMgSSe alloys
Authors: R. Moug, C. Bradford, A. Curran, F. Izdebski, I. Davidson, K. A. Prior, R. J. Warburton
Venue: Microelectronics Journal (2009)

An epitaxial lift-off technique for removing wide bandgap II-VI heterostructures from GaAs substrates has previously been demonstrated using lattice-matched MgS as the sacrificial layer. However, using MgS as an etch release layer prevents its use as a wide bandgap barrier in the rest of the structure. Here, we describe the use of the etch-resistant alloy Zn.2Mg.8S.64Se.36 which we have developed as a replacement for MgS. We demonstrate that this alloy can be grown by MBE together with MgS in heterostructures and used as a barrier for ZnSe. A ZnSe quantum well with Zn.2Mg.8S.64Se.36 barriers shows no decrease in photoluminescence intensity after the etching process but shows a shift in emission wavelength associated with the changing strain state.
The TeeBoard: an education-friendly construction platform for e-textiles and wearable computing
Authors: Grace Ngai, Stephen C.F. Chan, Joey C.Y. Cheung, Winnie W.Y. Lau
Venue: Proceedings of the 27th international conference on Human factors in computing systems (2009)

The field of wearable computing and e-textiles has recently attracted much interest from the research and general community. Recent developments in this field raises the possibility of e-textile construction kits for hobbyists and novices alike. The unique nature of wearable computing and e-textiles also gives it a lot of potential as an educational computing topic, as it allows students to exercise their creativity and imagination while learning about computing and technology. However, there are numerous difficulties involved in deploying existing technology in an educational environment. Current state of the art technology and techniques are not yet robust or reliable enough to stand up to the demands of educational computing, and they require a high level of skill from the user. In this paper, we present the TeeBoard, a constructive platform for e-textiles and wearable computing that is designed specifically to "lower the floor" for the integration of e-textiles into educational computing.
UbiGreen: investigating a mobile tool for tracking and supporting green transportation habits
Authors: Jon Froehlich, Tawanna Dillahunt, Predrag Klasnja, Jennifer Mankoff, Sunny Consolvo, Beverly Harrison, James A. Landay
Venue: Proceedings of the 27th international conference on Human factors in computing systems (2009)

The greatest contributor of CO2 emissions in the average American household is personal transportation. Because transportation is inherently a mobile activity, mobile devices are well suited to sense and provide feedback about these activities. In this paper, we explore the use of personal ambient displays on mobile phones to give users feedback about sensed and self-reported transportation behaviors. We first present results from a set of formative studies exploring our respondents' existing transportation routines, willingness to engage in and maintain green transportation behavior, and reactions to early mobile phone "green" application design concepts. We then describe the results of a 3-week field study (N=13) of the UbiGreen Transportation Display prototype, a mobile phone application that semi-automatically senses and reveals information about transportation behavior. Our contributions include a working system for semi-automatically tracking transit activity, a visual design capable of engaging users in the goal of increasing green transportation, and the results of our studies, which have implications for the design of future green applications.
Semi-autonomous avatars in world of minds: a case study of AI-based game design
Authors: Mirjam Palosaari Eladhari, Michael Mateas
Venue: Proceedings of the 2008 International Conference on Advances in Computer Entertainment Technology (2008)

In this paper we describe the Mind Module (MM), a technical framework for modeling personality and emotion for both player and non-player characters, and describe the World of Minds (WoM), an MMORPG that employs an AI-based game mechanic designed around the MM. Where most research on character AI has focused on autonomous characters, the focus of this work is on a semi-autonomous agent architecture built to be used in a multiplayer environment as part of the player's avatar. The MM models personality using the Five Factor Model from personality psychology, and maintains emotional state as a function of the personality and the avatar's interactions with people and objects in the world. WoM is a prototype MMORPG where the personalities of the player characters are the base for the game mechanics. In this paper, we provide a case-study of AI-based game design, describing the Mind Module, the game mechanic designed around the Mind Module, and lessons learned for both the AI and the game design from a playtest of a paper prototype of the game.
On Embedding of a Hypercube in a Completely Overlapping Network
Authors: Sanpawat Kantabutra, Jakarin Chawachat
Venue: Theory of Computing Systems (2008)

In this paper a new theoretical network called Completely Overlapping Network or CON is introduced. We show that a d-dimensional hypercube network can be embedded into this new network. Taking advantage of faster and more powerful processors and a large gap between communication and computation speeds, we also show that the embedded d-dimensional hypercube can be scaled using latency hiding. Related mathematical properties are also shown for optimal scaling.
Augmented duality: overlapping a metaverse with the real world
Authors: Mark Wright, Henrik Ekeus, Richard Coyne, James Stewart, Penny Travlou, Robin Williams
Venue: Proceedings of the 2008 International Conference on Advances in Computer Entertainment Technology (2008)

The advent of metaverses provide exciting opportunities for augmented reality research. We have created a number of interactions between the metaverse Second Life and the real world. Camera phone image matching creates portals and triggers the metaverse to mimic real locations. Image processing, tracking, projection and 3D video sprites create varied possibilities for people and avatars to have presence in each others worlds. We argue that these multiform contacts and overlaps between multiple points in the real world and an extensive and distinct metaverse constitute a new class of augmented reality interaction. Such a system of multiple parallel social existences may point to a mass social networking phenomenon built on the overlapping of a metaverse with the real world which we call Augmented Duality.
Clustered Planarity: Clusters with Few Outgoing Edges
Authors: Vít Jelínek, Ondřej Suchý, Marek Tesař, Tomáš Vyskočil
Venue: Graph Drawing: 16th International Symposium, GD 2008, Heraklion, Crete, Greece, September 21-24, 2008. Revised Papers (2009)

We present a linear algorithm for c-planarity testing of clustered graphs, in which every cluster has at most four outgoing edges.
Acoustically-induced mode-coupling in photonic crystal fibers
Authors: Jian Ju, K. S. Hong, Wei Jin, H. Q. Zhu, Q. Li
Venue: Proceedings of the 2008 International Conference on Advanced Infocomm Technology (2008)

We report the results of our recent investigation on acoustically-induced mode-coupling in few-mode photonic crystal fibers. The potential applications of such acousto-optic devices in tunable optical filters, switches and interferometric sensors will be discussed.
A Markov Prediction Model Based on Page Hierarchical Clustering
Authors: Yao Yao, Lei Shi, Zhanhong Wang
Venue: International Journal of Distributed Sensor Networks (2009)

The Markov prediction model is the basis of Web prefetching and personalized recommendation. It can be used to extract connotative Web link hierarchy. The visualized site structure can not only help users understand the relationships between the pages they have visited, but also suggest where they can go next. But the existence of a large amount of Web objects results in data redundancy and model hugeness. Therefore, how to mine and improve the link structure of a website has become a chief problem and it has positive meanings for prefetching. This paper presents an improved method that simplifies the topology structure of a website and extracted the conceptual link hierarchy which can make the organization clearly and legibly. First, the Markov Tree is constructed for the reason that a more capable mechanism for representing past activity in a form usable for prediction is a Markov Tree. In this case the Markov chain model can be defined as a three-tuple (A, S, P), where A is the collection of operation, S is the state space consisting of all the states in a link structure, and P is the one-step transition probability matrix. The transition probability matrix is calculated based on the Markov tree. Second, an algorithm is given to extract the hierarchical tree from the above matrix. The website link hierarchy (WLH) is obtained accordingly. A WLH only contains a trunk link which is a hyperlink from a page on a higher conceptual level to a page on its adjacent lower conceptual level. With the levels increment, there must be more and more pages in each level. It may blur the structure of the website. In order to tackle the problem, a clustering algorithm is proposed to cluster conceptually-related pages on same levels based on their in-link and out-link similarities, which are measured by the concept of weighted Euclidean distance. After the pages in WLH have been clustered, WLC can be constructed. Finally, the simplified model will be used for Web page prediction. Three parameters, i.e. precision, recall, and PRS have been employed to measure the performance in the experiments. Experiments based on two real Web log data demonstrate the efficiency of the proposed method, which can not only have good overall performance and clustering effect but also keep the relative higher prediction accuracy and recall.
Computer based testing using "digital ink": Participatory design of a Tablet PC based assessment application for secondary education
Authors: Panagiotis Siozos, George Palaigeorgiou, George Triantafyllakos, Theofanis Despotakis
Venue: Computers Education (2009)

In this paper, we identify key challenges faced by computer-based assessment (CBA) in secondary education and we put forward a framework of design considerations: design with the students and teachers, select the most appropriate media platform and plan an evolution rather than a revolution of prior practices. We present the CBA application 'MyTest' which was developed using the participatory methodology We!Design, with the collaboration of 31 students and teachers. The application is targeted for the Tablet PC platform, provides ''digital ink'' capabilities and supports both closed-type and open questions, facilitating the transfer of traditional assessment practices to CBA. Both students and teachers were excited about the design sessions, and they asserted that they would rely more on educational software designed using this approach. The comparison of the 'MyTest' application with an assessment application developed with the same participatory methodology and the involvement of 40 undergraduate students revealed dissimilar expectations and needs of high school and undergraduate students that are often disguised or misinterpreted. A pilot evaluation of the application in real learning conditions was conducted with 31 students using Tablet PCs and with 37 students using traditional PCs. Interestingly, the Tablet PC platform rendered the 'MyTest' application more useful and usable to the students, validating our claims.