ppxscal/embedding_network huggingface dataset:
An ultra-small anechoic box for rod array antenna measurement
Authors: Q. Han, K. Inagaki, K. Iigusa, R. Schlub, T. Ohira
Venue: Proceedings of the The 8th International Conference on Communication Systems - Volume 01 (2002)

The influence of RF absorbers in the vicinity of an antenna is investigated in order to find the minimum size for an ultra-small anechoic box necessary for measuring the reactive-near-fields of small rod array antennas. We use the return loss at the port of the antenna measured by changing the separation distance between the antenna and the absorber to evaluate the influence. We find that an antenna's performance is not influenced by nearby absorbers even if the absorbers are placed within the reactive-near-field region of the antenna when the absorbers are properly chosen. A prototype ultra-small anechoic box with outer dimensions of 5 /spl lambda/ is fabricated based on a reactive-near-field probing technique. To evaluate the proposed anechoic box, we compare a 1-GHz bandwidth return loss obtained from the ultra-small anechoic box with that obtained from a large anechoic chamber. They show good agreement and the maximum difference is only 0.28 dB. We also compare far-field radiation patterns obtained by calculating the reactive-near-fields measured in the ultra-small anechoic box with those obtained directly from far-field pattern measurement to confirm that the proposed ultra-small anechoic box is effective for use in measuring and characterizing the rod array antenna performance.
Graduate Training from an Industry Perspective
Authors: Marie Moloney
Venue: Proceedings of the 20th Conference on Software Engineering Education & Training (2007)

This talk presents an industry perspective on the issues and challenges that arise in recruiting and training graduates to work in software development. It describes various aspects of Fidelity Investment's experience to date, and explains the factors leading to the setup of its Graduate Training program (GIFT). It outlines how the programme is structured and how it was developed. It discusses the relationship between what is needed in industry and what is done in academia, and offers recommendations for the future to help ensure delivery of high calibre graduates.
How to choose a digital preservation strategy: evaluating a preservation planning procedure
Authors: Stephan Strodl, Christoph Becker, Robert Neumayer, Andreas Rauber
Venue: Proceedings of the 7th ACM/IEEE-CS joint conference on Digital libraries (2007)

An increasing number of institutions throughout the world face legal obligations or business needs to collect and preserve digital objects over several decades. A range of tools exists today to support the variety of preservation strategies such as migration or emulation. Yet, different preservation requirements across institutions and settings make the decision on which solution to implement very diffcult. This paper presents the PLANETS Preservation Planning approach. It provides an approved way to make informed and accountable decisions on which solution to implement in order to optimally preserve digital objects for a given purpose. It is based on Utility Analysis to evaluate the performance of various solutions against well-defined requirements and goals. The viability of this approach is shown in a range of case studies for different settings. We present its application to two scenarios of web archives, two collections of electronic publications, and a collection of multimedia art. This work focuses on the different requirements and goals in the various preservation settings.
An investigation of attitudes of k--12 teachers toward computer technology use in schools in a rural mississippi district
Authors: W. C. Johnson
Venue:  (2006)

This study investigates K-12 teachers' attitudes toward computer technology use in schools. The study looks at teacher variables that might affect the implementation of computer use in the learning environment.A sample of 179 teachers in a Northeast Mississippi school district participated in this study. The survey, the Computer Attitude Scale (CAS), consisted of two sections. In section one, teachers were asked to provide demographic information about themselves such as computer experience, access to a computer at home, age, gender, teaching level, teaching field, ethnicity, and education level. The second section was a 40-item questionnaire used to measure inservice teachers' attitudes toward computer technology.Analysis of variance (ANOVA) was used to analyze mean differences in attitudes based on computer experience, computer at home, teaching field, teaching level, and age. The result revealed that there were significant differences between teachers' attitudes as related to the teaching levels. No significant differences were found among computer anxiety, computer confidence, computer liking, and computer usefulness based on age, and teaching field.T-tests were used to analyze mean differences in attitudes based on gender and ethnicity. No significant differences were found among computer anxiety, computer confidence, computer liking, and computer usefulness based on ethnicity and gender.From these results, it was concluded that school districts could provide opportunities for inservice training and staff development for all teachers in educational technology with focus on computer use in the classroom and teachers attitude. It was also concluded that teachers should be trained in the ways that computer technology can be used in their work environment as well.
Evolving Extended Naive Bayes Classifiers
Authors: Frank Klawonn, Plamen Angelov
Venue: Proceedings of the Sixth IEEE International Conference on Data Mining - Workshops (2006)

Naive Bayes classifiers are a very simple, but often effective tool for classification problems, although they are based on independence assumptions that do not hold in most cases. Extended na¨ýve Bayes classifiers also rely on independence assumptions, but break them down to artificial subclasses, in this way becoming more powerful than ordinary na¨ýve Bayes classifiers. Since the involved computations for Bayes classifiers are basically generalised mean value calculations, they easily render themselves to incremental and online learning. However, for the extended na¨ýve Bayes classifiers it is necessary, to choose and construct the subclasses, a problem whose answer is not obvious, especially in the case of online learning. In this paper we propose an evolving extended na¨ýve Bayes classifier that can learn and evolve in an online manner.
Really, really small: the palpability of the invisible
Authors: Thecla Schiphorst
Venue: Proceedings of the 6th ACM SIGCHI conference on Creativity cognition (2007)

Our physical technology continues to grow smaller and smaller; so small that the computer itself is no longer seen as an object but a set of invisible distributed processes. Technology is becoming an inseparable aspect of experience, palpable yet invisible. At the same time, an extra-ordinary wealth of literature is emerging within human-computer interaction that is exploring experience, embodiment, subjectivity, and felt-life. This interest is often accompanied by research questions that are continuing to re-balance our understanding of the relationship between subjective and objective knowing, making, and doing. These emerging trends can be seen as a response to the phenomena of the really, really small: and marks a cognitive and creative shift from the visible to the invisible. This paper contextualizes the emerging recognition within HCI that there is value in designing for technology as experience, and offers a framework from the field of Somatics that can contribute to the discourse, particularly with regard to the body in everyday life. Somatics is exemplified through first-person methodologies and embodied approaches to learning and interacting. I present a set of design cases that demonstrate its application within HCI.
Application-Level Adaptive Congestion Detection and Control for VoIP
Authors: Teck-Kuen Chua, David C. Pheanis
Venue: Proceedings of the Third International Conference on Networking and Services (2007)

For decades, researchers have worked extensively in the area of congestion control for packet-switched networks. Many proposed solutions take advantage of the congestioncontrol mechanism in Transmission Control Protocol (TCP), and these approaches work well for networks that have heavy TCP traffic. However, these approaches are not universally effective they fail completely for protocols that do not implement congestion-control mechanisms. In particular, these approaches do not work with the User Datagram Protocol (UDP). Realtime media-streaming technologies such as Voice over Internet Protocol (VoIP) and video conferencing use UDP and therefore do not respond well to existing congestion-avoidance techniques. We propose a new, adaptive, responsive, end-to-end technique to implement application-level congestion detection and control for real-time applications such as VoIP. Unlike existing methods, which rely on packet loss as a signal to reduce the transmission rate, our solution reacts to network congestion to prevent packet loss, thus improving the QoS of applications that employ our algorithm.
Reflection as a Principle for Better Usability
Authors: Christof Lutteroth, Gerald Weber
Venue: Proceedings of the 2007 Australian Software Engineering Conference (2007)

This paper explores the principle of reflection, which is well-known from the world of programming languages, and its relation to HCI. We define reflection in a wider sense that can be applied to the world of user interfaces, and argue that the new, generalized notion of reflection can benefit the usability of a system significantly. The paper discusses concrete approaches for the design of reflective user interfaces, and shows that the reflection principle is in fact already used in many existing applications.
A nonlinear subband decomposition with perfect reconstruction
Authors: F. J. Hampson
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 03 (1996)

Multirate filter banks are of great interest for many applications in both signal and image processing. In particular, filter banks with critical subsampling and perfect reconstruction, have received special attention. Often such decompositions are restricted to linear analysis/synthesis filters possibly with some intermediate nonlinear treatment. We introduce a new structure which generates a variety of linear and nonlinear subband decompositions with critical subsampling. The structure is such that perfect reconstruction from the subband coefficients is guaranteed. As an example we consider applying it to image coding.
ECSEL Coalition techniques and results for improving retention
Authors: G. Kalonji
Venue: Proceedings of the Frontiers in Education Conference, on 1995. Proceedings., 1995 - Volume 02 (1995)

Summary form only given. ECSEL, one of the first of the NSF-sponsored Engineering Education Coalitions, has been engaged in an ambitious and multifaceted effort, woven around the twin goals of the transformation of the learning environment and improving attraction and retention rates, particularly for underrepresented groups. The diverse platform of schools in the coalition, as well as the diverse approaches that have been developed at the various schools, offer us the opportunity to gain insight into a variety of aspects of the interplay between these twin goals. We present results to date on the impact of changes in the learning environment, both in-class and out-of-class, on retention of students in engineering in our seven schools. The focus in our first five years has been primarily on the first two years of the undergraduate program, as well as on K-12 outreach efforts, while in Years 6-10, we are placing a heavy emphasis on upper level interdisciplinary design experiences. Our presentation outlines how what we have learned as a coalition in Years 1-5 informs the strategies for our newer efforts.
On Efficient Processing of Subspace Skyline Queries on High Dimensional Data
Authors: Wen Jin, Anthony K. H. Tung, Martin Ester, Jiawei Han
Venue: Proceedings of the 19th International Conference on Scientific and Statistical Database Management (2007)

Recent studies on efficiently answering subspace skyline queries can be separated into two approaches. The first focused on pre-materializing a set of skylines points in various subspaces while the second focus on dynamically answering the queries by using a set of anchors to prune off skyline points through spatial reasoning. Despite effort to compress the pre-materialized subspace skylines through removal of redundancy, the storage space for the first approach remain exponential in the number of dimensions. The query time for the second approach on the other hand also grow substantially for data with higher dimensionality where the pruning power of anchors become much weaker. In this paper, we propose methods for answering subspace skyline query on high dimensional data such that both prematerialization storage and query time can be moderated. We propose novel notions of maximal partial-dominating space, maximal partial-dominated space and the maximal equality space between pairs of skyline objects in the full space and use these concepts as the foundation for answering subspace skyline queries for high dimensional data. Query processing involves mostly simple pruning operations while skyline computation is done only on a small subset of candidate skyline points in the subspace. We also develop a random sampling method to compute the subspace skyline in an on-line fashion. Extensive experiments have been conducted and demonstrated the efficiency and effectiveness of our methods.
Mechanisms for object caching and consistency management in distributed systems
Authors: Anand Tripathi
Venue:  (2006)

To achieve good performance, distributed object systems must utilize caching. This dissertation presents object caching mechanisms for Java RMI-based distributed object systems. These mechanisms are compatible with RMI and are transparent to RMI client applications. We developed a set of tools to create the objects for the caching mechanisms. We created and used several RMI benchmarks to illustrate the caching mechanisms' utility. Our caching mechanisms use a framework to implement consistency policies. This framework uses an event/action model that permits consistency policies to control the caching mechanisms in response to consistency-related events. Using this framework, we implemented and evaluated five different consistency policies. Because an object's usage may change, our mechanisms permit the consistency policy used by an object to be changed. To accomplish this, we created a cost model that determines the cost of the current consistency policy and estimates the cost of other policies. If the model indicates that another policy will provide better performance, then the mechanisms will switch to use that policy. To effectively cache RMI objects, these mechanisms cache a reduced object; a modified form of the RMI object from which unused instance variables have been removed. We also create reduced collection objects which cache a portion of a collection object. A reduced object's primary advantage is the reduction of the communication cost required to cache an object. Recognizing that semantics-based consistency policies may provide better performance than traditional consistency policies, we introduce the concept of method group commutativity. Method group commutativity specifies the conditions under which a set of operations will commute, in contrast to previous approaches that consider pairs of operations. A formal definition of commutativity, in terms of Hoare logic expressions, guides the development of a methodology to create a method commutativity specification from the semantic specification of an object's methods. This methodology uses the PVS theorem prover to analyze and validate commutativity properties. We extend this methodology to express weakened semantics in the method commutativity specification that, in turn, enables greater commutativity. Finally, a semantics-based consistency policy is implemented using method group commutativity.
A Modular Software Haptic Interface for Teleoperated Nanomanipulation and AFM Probe Based Characterization of Carbon Nanotubes
Authors: Atanas Dobrinov, Volkmar Eichhorn
Venue: Proceedings of the Second Joint EuroHaptics Conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems (2007)

The purpose of this paper is to illustrate a design approach, implementation and application of a software interface for operating haptic devices. The proposed interface is modular in nature and allows for the operation of independently developed encapsulated software modules coupled only via a directly accessed and mutually shared memory space. This allows for easy integration/addition or exchange of different types of haptic device software modules without the need of substantial time investments or extensive modification of the existing code. The paper demonstrates a realized concrete software interface design, implemented and tested with a nanohandling station for the characterization of Carbon Nanotubes (CNT) inside a Scanning Electron Microscope (SEM). The paper describes the implemented software features and principle of operation of the interface as well as the experimental setup of the nanohandling station and results towards CNT Characterization.
A CABAC Encoder Design of H.264/AVC with RDO Support
Authors: X. H. Tian, Thinh M. Le, B. L. Ho, Y. Lian
Venue: Proceedings of the 18th IEEE/IFIP International Workshop on Rapid System Prototyping (2007)

In this paper, a HW CABAC encoder architecture is proposed targeting H.264/AVC main profile. CABAC and Rate Distortion Optimization (RDO) are two important coding tools that enhance coding efficiency of H.264/AVC. However, coding speed of CABAC encoder is limited by the coding data dependence and its serial coding procedure, and RDO requires large memory resource and costs long delay of memory access to backup and restore CABAC context state data. The CABAC encoder of this paper utilizes pipeline structure at top level to reduce data dependence, and coding speed of one symbol per cycle is achieved. A context managing mechanism is designed that fully supports RDO coding of H.264/AVC encoder. It significantly reduces context memory cost and operation delay for context backup and restore. 85% of context memory resource is reduced comparing to the reference design. Synthesis result shows that the encoder can work at 620 MHz targeting 0.13um CMOS process.
Outcomes based engineering education. II. The merits of continuous programme evaluation
Authors: J. Heywood
Venue: Proceedings of the Frontiers in Education Conference,1997. on 27th Annual Conference. Teaching and Learning in an Era of Change. - Volume 01 (1997)

For pt.I see ibid., p.121-8 (1997). The merits of course and programme evaluation in the implementation of 'new' courses in engineering are discussed. They are illustrated by the development and initial evaluations of a two year programme in engineering science with particular reference to laboratory and project work. A number of partial evaluations were undertaken. As a result the programme continually evolved within the established parameters. This study concentrates on the first five years of development. It emerged that the demands for practical work were too heavy. Consequently the requirements were reduced. Additionally the sections of the syllabus(content) were reduced from eight to seven. Two studies showed that some anticipated "outcomes" were not achieved while some unanticipated "outcomes" emerged. Among the reasons for this was a failure to ensure that instruction and objectives ("outcomes") were clearly linked. A systems approach is required for the design of "outcome" based curricula. The paper begins with a brief description of the examination, and the context in which it functioned in England and Wales. This is followed by a brief summary of an investigation into an examination in mechanical engineering which influenced the designers of the new examination. Thereafter. The objectives for the programme are listed together with the specific objectives for three kinds of practical work. Their translation into authentic "outcomes" assessment rubrics is described. 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
Exploring Trust among Globally Distributed Work Teams
Authors: Sue Newell, Gary David, Donald Chand
Venue: Proceedings of the 40th Annual Hawaii International Conference on System Sciences (2007)

Trust among team members has been identified as a crucial variable for the success of projects executed by virtual teams. This paper explores trust among IT work teams whose members are located at sites that are distributed in the United States, Ireland and India. Our case analysis suggests that trust among team members is problematic and it can be difficult to achieve among on-shore and off-shore sites when a "client/vendor" orientation frames the relationship. The key point of this paper is that management cannot expect team members to be able to build trust through competence and personal relationships when the social dynamics of the firm creates fragmentation, "Us versus Them" feeling and an environment of distrust. As a result, workers at distributed sites must find ways of overcoming this orientation and developing some measure of personal rapport to enable the formation of trust and accomplishment of collaborative work.
Performance of Redundant Disk Array Organizations in Transaction Processing Environments
Authors: Antoine N. Mourad, W. Kent Fuchs, Daniel G. Saab
Venue: Proceedings of the 1993 International Conference on Parallel Processing - Volume 01 (1993)

We study the performance of two redun dant disk array organizations in a transaction processing environment and compare it to that of mirrored disk organi zations and organizations using no striping and no redun dancy. Redundant disk arrays and mirrored disks are used for providing rapid recovery from mediafailures in systems requiring high availability. The disk array organizations examined are: data striping with rotated parity (RAIDS) and Parity Striping. RAIDS provides high data transfer rates by striping the data over multiple disks. It also pro vides better load balancing over the disks in the array. At the same time, data striping increases disk arm use which can lead to longer queuing delays. In transaction process ing environments, because of the nature of I/O requests, namely a large number of small size requests, disk arms are a more valuable resource than data transfer bandwidth. Hence, parity striping was proposed as an alternative to RAIDS. It provides rapid recovery from failure at the same low storage cost without interleaving the data over multiple disks. In this study, we use data from a large scale commer cial transaction processing site to evaluate and compare the performance of the above organizations. We consider both non-cached systems as well as systems using a non-volatile cache in the controller.