ppxscal/embedding_network huggingface dataset:
Global grid monitoring: the EGEE/WLCG case
Authors: Alexandre Nóbrega Duarte, Piotr Nyczyk, Antonio Retico, Domenico Vicinanza
Venue: Proceedings of the 2007 workshop on Grid monitoring (2007)

Grids have the potential to revolutionize computing by providing ubiquitous, on demand access to computational services and resources. However, grid systems are extremely large, complex and prone to failures. In this paper we present a tool able to to check if a given grid service works as expected for a given user or set of users on the different resources available on a grid. Our solution deals with the grid services as single components that should produce an expected output to a pre-defined input, what is quite similar to unit testing. Our tool, called Service Availability Monitoring or SAM, is being currently used to monitor some of the largest (maybe the largest) production grids available today.
Implementing a secure rlogin environment: a case study of using a secure network layer protocol
Authors: Gene H. Kim, Hilarie Orman, Sean O'Malley
Venue: Proceedings of the 5th conference on USENIX UNIX Security Symposium - Volume 5 (1995)

This paper describes our experiences building a secure rlogin environment. With minimal changes to the rlogin server and the use of a secure network layer protocol, we remove the vulnerability of hostname-based authentication and IP source address spoofing. We investigate how applications such as rlogin interact with this new layer, and propose extensions to the rlogin server that can utilize these services. We believe rlogin presents a situation where the application layer seems the most appropriate location for enforcing security policy, instead of in a lower layer. Our layered approach to rlogin security achieves functionality similar to the Kerberos klogin client and the encrypted telnet packages, without their complexity or loss of generality. Implementing the application layer rlogin server extensions required fewer than ninety lines of code. Even if our rlogin application layer extensions are omitted, rlogin connections still benefit from secure network layer services.
A competitive information recommendation system and its rational recommendation method
Authors: Toshiki Sakamoto, Yasuhiko Kitamura, Shoji Tatsumi
Venue: Systems and Computers in Japan (2007)

Retrieval engines are widely used as a means for users to acquire information satisfying their requirements from the large amount of diversified Web information on the Internet. However, retrieval engines cannot be useful unless the requirements from the user are explicitly represented in terms of keywords. Consequently, information recommendation systems are attracting attention as a means of providing information which is likely to interest the user. This paper proposes a competitive information recommendation system, which recommends information to the user by competitive interaction of multiple agents, each having an individual character, with the user. In the competitive information recommendation system, if the agent simply recommends the information autonomously, information desired by the user may not be recommended, or many interactions may be needed before the user acquires the desired information. Therefore, this paper proposes a rational recommendation method in which the utility for the user that can be obtained from the recommended information is represented by a multi-attribute utility function, and the agent recommends only information desirable to the user while learning the weight for each attribute. Then the best profit strategy, in which the profit of the agent has priority, and the best learning strategy, in which learning of the utility to the user has priority, are presented as information recommendation strategies for the agent. An evaluation experiment shows that the best profit strategy is better. &copy; 2007 Wiley Periodicals, Inc. Syst Comp Jpn, 38(9): 74&ndash;84, 2007; Published online in Wiley InterScience (). DOI 10.1002&sol;scj.10662
Dynamic and Redundant Data Placement
Authors: A. Brinkmann, S. Effert, F. Meyer auf der Heide
Venue: Proceedings of the 27th International Conference on Distributed Computing Systems (2007)

We present a randomized block-level storage virtualization for arbitrary heterogeneous storage systems that can distribute data in a fair and redundant way and can adapt this distribution in an efficient way as storage devices enter or leave the system. More precisely, our virtualization strategies can distribute a set of data blocks among a set of storage devices of arbitrary non-uniform capacities so that a storage device representing x% of the capacity in the system will get x% of the data (as long as this is in principle possible) and the different copies of each data block are stored so that no two copies of a data block are located in the same device. Achieving these two properties is not easy, and no virtualization strategy has been presented so far that has been formally shown to satisfy fairness and redundancy while being time- and space-eflcient and allowing an efjTcient adaptation to a changing set of devices.
Equalisation of time variant communications channels: channel estimation based approaches
Authors: T. Shimamura
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 03 (1996)

For the purpose of tackling the problem of equalisation in a time variant environment, two novel approaches are developed in which the separation of the channel estimation process from the equalisation process is attempted. Two linear filters; channel estimator and equalisation filter, are used to reconstruct the transmitted sequence. The gradient algorithm with degree-1 least-square fading memory prediction is adopted for the channel estimator. Using the results produced by the channel estimator, the coefficients of the equalisation filter are indirectly updated. Computer simulation results show that the two channel estimation based adaptive equalisers provide significant improvement in the case of a second order Markov communication channel model.
Application for a Simple Device Authentication Framework: Device Authentication Middleware Using Novel Smart Card Software
Authors: Manabu Hirano, Takeshi Okuda, Suguru Yamaguchi
Venue: Proceedings of the 2007 International Symposium on Applications and the Internet Workshops (2007)

Our proposed simple device authentication framework [1] aims to provide device-oriented authentication and authorization mechanisms for non-PC Internet-ready information appliances. The purpose of the framework is to prevent device spoofing, and to restrict unauthorized access to the device in a future ubiquitous network. We have developed the novel smart card software to achieve peer to peer device-oriented PKI authentication and authorization on the secure tamper-resistant smart card. We assume that the smart card will be attached to a device such as an information appliance. In this paper, we show the prototype implementation of authentication middleware using our novel smart card software and the IKEv1 program. The IKEv1 program cooperates with our novel smart card software to achieve peer to peer production-level identity authentication for devices. Thus, our framework and its application shown in this paper will help to realize secure ubiquitous computing for Internet-ready home appliances.
Chip design of mel frequency cepstral coefficients for speech recognition
Authors: Jia-Ching Wang
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 2000. on IEEE International Conference - Volume 06 (2000)

The mel frequency cepstral coefficients (MFCC) is one of the mast important features, which is required among various kinds of speech applications. The chip for speech features extraction based on the MFCC algorithm is first proposed. The chip is designed with area efficient consideration and can achieve the following: (1) the reduction of table size and multiplication complexity by means of the symmetric property of the cosine function, (2) the decrease of the multiplication load and required constant memory in the calculation of the weighted energy spectrum by applying the mapping relationship between the mel scale and the frequency scale, (3) the minimization of the look-up table size for logarithm operations by modifying the partitioned table look-up method. The chip is fabricated with 0.6 /spl mu/m double-metal CMOS technology. It contains approximately 10,000 gates occupying 3.2/spl times/3.3 mm/sup 2/ area and the maximum clock rate is 50 MHz.
Scalable and progressive audio codec
Authors: M. S. Vinton
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 2001. on IEEE International Conference - Volume 05 (2001)

A source coding technique for variable, bandwidth-constrained channels such as the Internet must do two things: offer high quality at low data rates, and adapt gracefully to changes in available bandwidth. Here we propose an audio coding algorithm that is superior on both counts. It is inherently scalable, meaning that channel conditions can be matched without the need for additional computation. Moreover, it is compact: in subjective tests our algorithm, coded at 32 kb/s/channel, outperformed MPEG-1 Layer 3 (MP3) coded at 56 kb/s/channel (both at 44.1 kHz). We achieve this simultaneous increase in compression and scalability through use of a two-dimensional transform that concentrates relevant information into a small number of coefficients.
Convergence time to Nash equilibrium in load balancing
Authors: Eyal Even-Dar, Alex Kesselman, Yishay Mansour
Venue: ACM Transactions on Algorithms (TALG) (2007)

We study the number of steps required to reach a pure Nash equilibrium in a load balancing scenario where each job behaves selfishly and attempts to migrate to a machine which will minimize its cost. We consider a variety of load balancing models, including identical, restricted, related, and unrelated machines. Our results have a crucial dependence on the weights assigned to jobs. We consider arbitrary weights, integer weights, k distinct weights, and identical (unit) weights. We look both at an arbitrary schedule (where the only restriction is that a job migrates to a machine which lowers its cost) and specific efficient schedulers (e.g., allowing the largest weight job to move first). A by-product of our results is establishing a connection between various scheduling models and the game-theoretic notion of potential games. We show that load balancing in unrelated machines is a generalized ordinal potential game, load balancing in related machines is a weighted potential game, and load balancing in related machines and unit weight jobs is an exact potential game.
Mechatronics as a challenge for teaching technology in secondary education
Authors: S. Kocijancic
Venue: Proceedings of the Frontiers in Education Conference, 2001. on 31st Annual - Volume 01 (2001)

Teaching of technology in Slovenian lower-secondary schools has, in the past, been primarily focused on design and construction of simple everyday objects. The technology curriculum was renewed in 1999 emphasizing project based teaching. The changes in teaching technology were significantly influenced by positive experiences at the Faculty of Education in Ljubljana. The challenge of mechatronics, an interdisciplinary field, was to integrate electronic, mechanical, control and computer engineering into selected projects and to transfer these to secondary education practice. Some examples of these projects are summarized in this paper. One example is a control system for light intensity, utilizing computers. Transient phenomena are demonstrated by sudden changes in the required intensity of light; the required changes being mostly caused by the time delay in heating of the bulb's filament. Another example project involves the control of vehicle motion; this project begins with mechanical switches, continues with digital control and concludes with infrared remote control. 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
Augmenting amusement rides with telemetry
Authors: Brendan Walker, Holger Schnädelbach, Stefan Rennick Egglestone, Angus Clark, Tuvi Orbach, Michael Wright, Kher Hui Ng, Andrew French, Tom Rodden, Steve Benford
Venue: Proceedings of the international conference on Advances in computer entertainment technology (2007)

We present a system that uses wireless telemetry to enhance the experience of fairground and theme park amusement rides. Our system employs wearable technologies to capture video, audio, heart-rate and acceleration data from riders, which are then streamed live to large public displays and are also recorded. This system has been embedded into a theatrical event called Fairground: Thrill Laboratory in which riders are first selected from a watching audience and their captured data is subsequently presented back to this audience and discussed by experts in medical monitoring, psychology and ride design. Drawing on our experience of deploying the system on three contrasting rides, during which time it was experienced by 25 riders and over 500 audience members, we reflect on how such telemetry data can enhance amusement rides for riders and spectators alike, both during and after the ride.
Fall Detection from Human Shape and Motion History Using Video Surveillance
Authors: Caroline Rougier, Jean Meunier, Alain St-Arnaud, Jacqueline Rousseau
Venue: Proceedings of the 21st International Conference on Advanced Information Networking and Applications Workshops - Volume 02 (2007)

Nowadays, Western countries have to face the growing population of seniors. New technologies can help people stay at home by providing a secure environment and improving their quality of life. The use of computer vision systems offers a new promising solution to analyze people behavior and detect some unusual events. In this paper, we propose a new method to detect falls, which are one of the greatest risk for seniors living alone. Our approach is based on a combination of motion history and human shape variation. Our algorithm provides promising results on video sequences of daily activities and simulated falls.
Back Inside Cover [blank]
Venue: Proceedings of the High Performance Interconnects, 2004. on Proceedings. 12th Annual IEEE Symposium (2004)

IEEE 802.11 wireless LAN technology is mainly used as an access network within corporate enterprises. All the WLAN access points are eventually connected to a wired backbone to reach the Internet or enterprise computing resources. We aim to expand WLAN into an enterprise-scale backbone network technology by developing a multichannel wireless mesh network architecture called Hyacinth. Hyacinth equips each node with multiple IEEE 802.11a/b NICs and supports distributed channel assignment/routing to increase the overall network throughput. We present the results of a detailed performance evaluation study on the multichannel mesh networking aspect of Hyacinth, based on both NS-2 simulations and empirical measurements collected from a 9-node Hyacinth prototype testbed. A key result of this study is that equipping each node of a Hyacinth network with just 3 NICs can increase the total network bandwidth by a factor of 6 to 7, as compared with single-channel wireless mesh network architecture. 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
Development of a multi-layer microelectrofluidic platform
Authors: S. H. Ng, Z. F. Wang, R. T. Tjeung, N. F. de Rooij
Venue: Microsystem Technologies (2007)

We report on the development of process capabilities for a polymer-based, multi-layer microelectrofluidic platform, namely: the hot embossing process, metallization on polymer and polymer bonding. Hot embossing experiments were conducted to look at the effects of load applied, embossing temperature and embossing time on the fidelity of line arrays representing micro channels. The results revealed that the embossing temperature was a more sensitive parameter than the others due to its large effect on the polymer material&#x2019;s viscoelastic properties. Dynamic mechanical analysis (DMA) conducted on polymethyl methacrylate (PMMA) revealed a steep glass transition over a 20&#x00b0;C range, with the material losing more than 95% of its storage modulus. The data explained the hot embossing results, which showed large changes in the embossed channel dimensions when the temperature was within the glass transition range. It was demonstrated that the micro-printing of silver epoxy was a possible low-cost technique in the mass production of disposable lab chips. An interconnecting, three-dimensional network of electrical traces was fabricated, as well as a microfluidic device with interconnecting, three-dimensional network of micro channels.
Maneuvering Aid for Large Vehicle using Omnidirectional Cameras
Authors: Tobias Ehlgen, Tomas Pajdla
Venue: Proceedings of the Eighth IEEE Workshop on Applications of Computer Vision (2007)

Maneuvering large vehicles like trucks is a challenging task because their drivers often cannot see the closest surrounding area of the vehicle. This paper presents a system providing the driver with a bird's-eye view of the surrounding area on a single display. This view is constructed by stitching together cutouts from two omnidirectional images acquired by catadioptric cameras, which are placed below the side mirrors. The geometry of the cameras is analyzed with respect to the formation of blind spots. We illustrate how to select the cutouts in order to eliminate completely the blind spots in the bird's-eye view.
A Hybrid Program Model for Object-Oriented Reverse Engineering
Authors: Michael W. Godfrey
Venue: Proceedings of the 15th IEEE International Conference on Program Comprehension (2007)

A commonly used strategy to address the scalability challenge in object-oriented reverse engineering is to synthesize coarse-grained representations, such as package diagrams. However, the traditional coarse-grained representations are poorly suited to object-oriented program comprehension as they can be difficult to map to the domain object models, contain little real detail, and provide few clues to the design decisions made during development. In this paper, we propose a hybrid model of objectoriented software that blends the use of classes and entities at different levels of granularity. Each coarse-grained entity represents a set of software objects, and contains the complete static description of the objects it represents. This hybrid model allows maintainers to understand objects as independent units, and focus on the their external properties and their interrelationships at different levels of granularity. We show the usefulness of the hybrid model to program comprehension by means of an exploratory case study.
Project massive: the social and psychological impact of online gaming
Authors: Robert E. Kraut
Venue:  (2006)

Millions of people play online games around the world, some for forty hours per week or more. Speculation abounds about both the positive and negative effects such a popular and time intensive activity might have on those who take part in it. In order to investigate how participation in these virtual worlds and the communities surrounding them might affect the player, three general research questions are posed. What factors contribute to players reporting that gaming has gone beyond being an engaging pass-time and begun to cause problems in their real life? Does play lead to social isolation or, instead, to an expansion in the social connectedness a player feels? Does involvement in online gaming lead to depression or can participation reduce depressive affect? Following a pilot survey involving 1836 respondents, a revised online survey was used to gather information from avid gainers about their gaming habits, attitudes, and feelings. Employing a longitudinal design, three waves of data were collected over a 14 month period from a sample including 2883 online gainers. Prospective analysis was used to establish causal and temporal linkages among the repeatedly measured factors. While the data provide some indication that a player's reasons for playing do influence the development of problematic usage, these effects are overshadowed by the central importance of self-regulation in managing both the timing and amount of play. An individual's level of self-regulatory activity is shown to be very important in allowing them to avoid negative outcomes like problematic use and, more broadly, depression. Further, the results indicate that participation in online gaming can lead to decreased isolation and enhanced social integration for those players who use online gaming as a medium in which to spend time and interact with real life friends and relatives. No causal link between online gaming and depression is observed, even in those individuals who report viewing their use as problematic. With responsible use, online gaming appears to be a healthy recreational activity that provides millions of people with hours of social entertainment and adaptive diversion. However, failure to manage play behavior can lead to feelings of dependency. Strategies and tools for addressing these self-regulatory deficits and supporting self-regulatory activity with respect to gaming behavior are discussed.
Design error and reusabilty
Authors: Margot Small
Venue: ACM SIGCSE Bulletin (2007)

Failure to account for the placement of components of a complex system on different servers leads to problems in reusability. We examine a case involving an Enterprise JavaBean (EJB) application using Java 2 Platform, Enterprise Edition (J2EE). In creating an EJB entity bean class to represent persistent data, the designer assumed that all EJB client objects would be local. Attempts by developers, whose programs were on another server, to create an entity bean object, failed. Lack of documentation by the original designer and lack of training in use of entity beans led to long delays in construction of new applications.
A Family of Directional Relation Models for Extended Objects
Authors: Spiros Skiadopoulos Nikos Sarkas Timos Sellis, Manolis Koubarakis
Venue: IEEE Transactions on Knowledge and Data Engineering (2007)

In this paper, we introduce a family of expressive models for qualitative spatial reasoning with directions. The proposed family is based on the cognitive plausible cone-based model. We formally define the directional relations that can be expressed in each model of the family. Then, we use our formal framework to study two interesting problems: computing the inverse of a directional relation and composing two directional relations. For the composition operator, in particular, we concentrate on two commonly used definitions, namely, consistency-based and existential composition. Our formal framework allows us to prove that our solutions are correct. The presented solutions are handled in a uniform manner and apply to all of the models of the family.