ppxscal/embedding_network huggingface dataset:
Hierarchical sensor fusion for building a probabilistic local map using active sensor modules
Authors: Gon woo Kim, Ji min Kim, Nosan Kwak, Beom hee Lee
Venue: Robotica (2008)

An algorithm for three-level hierarchical sensor fusions has beenproposed and applied to environment map building with enhanced accuracy and efficiency. The algorithm was realized through the two new types of sensor modules, which are composed of a halogen lamp-based active vision sensor and a semicircular ultrasonic (US) and infrared (IR) sensor system. In the first-level fusion, the US and IR sensor information is utilized in terms of the geometric characteristics of the sensor location. In the second-level fusion, the outputs from the US and IR sensors are combined with the sheet of halogen light through a proposed rule base. In the third-level fusion, local maps from the first-and second-level fusion are updated in a probabilistic way for a very accurate environment local map. A practical implementation has been carried out to demonstrate the efficiency and accuracy of the proposed hierarchical sensor fusion algorithm in environment map building.
ASR post-correction for spoken dialogue systems based on semantic, syntactic, lexical and contextual information
Authors: Ramón López-Cózar, Zoraida Callejas
Venue: Speech Communication (2008)

This paper proposes a technique to correct speech recognition errors in spoken dialogue systems that presents two main novel contributions. On the one hand, it considers several contexts where a speech recognition result can be corrected. A threshold learnt in the training is used to decide whether the correction must be carried out in the context associated with the current prompt type of a dialogue system, or in another context. On the other hand, the technique deals with the confidence scores of the words employed in the corrections. The correction is carried out at two levels: statistical and linguistic. At the first level the technique employs syntactic-semantic and lexical models, both contextual, to decide whether a recognition result is correct. According to this decision the recognition result may be changed. At the second level the technique employs basic linguistic knowledge to decide about the grammatical correctness of the outcome of the first level. According to this decision the outcome may be changed as well. Experimental results indicate that the technique enhances a dialogue system's word accuracy, speech understanding, implicit recovery and task completion rates by 8.5%, 16.54%, 4% and 44.17%, respectively.
The two-equal-disjoint path cover problem of Matching Composition Network
Authors: Pao-Lien Lai, Hong-Chun Hsu
Venue: Information Processing Letters (2008)

Embedding of paths have attracted much attention in the parallel processing. Many-to-many communication is one of the most central issues in various interconnection networks. A graph G is globally two-equal-disjoint path coverable if for any two distinct pairs of vertices (u,v) and (w,x) of G, there exist two disjoint paths P and Q satisfied that (1) P (Q, respectively) joins u and v (w and x, respectively), (2) |P|=|Q|, and (3) V(P@?Q)=V(G). The Matching Composition Network (MCN) is a family of networks which two components are connected by a perfect matching. In this paper, we consider the globally two-equal-disjoint path cover property of MCN. Applying our result, the Crossed cube CQ"n, the Twisted cube TQ"n, and the Mobius cube MQ"n can all be proven to be globally two-equal-disjoint path coverable for n>=5.
An integrated aspect-oriented model-driven software product line tool suite
Authors: Iris Groher, Christa Schwanninger, Markus Voelter
Venue: Companion of the 30th international conference on Software engineering (2008)

Software product line engineering is mostly about the systematic management of commonality and variability between product line members. The effectiveness of this approach thus very much depends on how well variability within the family of similar products is implemented and managed. Variability often has widespread impact, crosscutting not only multiple parts of individual artifacts but also multiple artifacts in multiple stages of the product line lifecycle. This demonstration presents an approach that facilitates variability implementation, management, and tracing by integrating aspect-oriented and model-driven software development. We demonstrate means for effectively dealing with variability on model, model transformation, and code generation level. The concepts are illustrated with a case study of a home automation system.
Cryptanalysis of cascaded convolutional transducers with local propagation
Authors: Mohammad Ali Oromiehchi, Seyadeh Fahimeh Mohebipoor
Venue: Proceedings of the 2nd WSEAS International Conference on Computer Engineering and Applications (2008)

Recently, the idea of design of dynamic symmetric cryptosystems is proposed. According to this idea, the property of cipher system is varied related to secret key. but unfortunately this cipher is not safer than whatever is claimed. In this paper, two attacks on the proposed design are investigated. The first attack is a partial key recovery which for a (k,k,m) q- cascaded convolutional transducers is determined a fragment of ciphertext without calculating master key with complexity O(k6). In addition, a weak key on this system is announced that one can recover longer fragment of plaintexts with complexity O(2×k6)..
DeMOR: decentralized model order reduction of linear networks with massive ports
Authors: Boyuan Yan, Lingfei Zhou, Sheldon X.-D. Tan, Jie Chen, Bruce McGaughy
Venue: Proceedings of the 45th annual Design Automation Conference (2008)

Model order reduction is an efficient technique to reduce the system complexity while producing a good approximation of the input-output behavior. However, the efficiency of reduction degrades as the number of ports increases, which remains a long-standing problem. The reason for the degradation is that existing approaches are based on a centralized framework, where each input-output pair is implicitly assumed to be equally interacted and the matrix-valued transfer function has to be assumed to be fully populated. In this paper, a decentralized model order reduction scheme is proposed, where a multi-input multi-output (MIMO) system is decoupled into a number of subsystems and each subsystem corresponds to one output and several dominant inputs. The decoupling process is based on the relative gain array (RGA), which measures the degree of interaction of each input-output pair. Our experimental results on a number of interconnect circuits show that most of the input-output interactions are usually insignificant, which can lead to extremely compact models even for systems with massive ports. The reduction scheme is very amenable for parallel computing as each decoupled subsystem can be reduced independently.
Cloaker: Hardware Supported Rootkit Concealment
Authors: Francis M. David, Ellick M. Chan, Jeffrey C. Carlyle, Roy H. Campbell
Venue: Proceedings of the 2008 IEEE Symposium on Security and Privacy (2008)

Rootkits are used by malicious attackers who desire to run software on a compromised machine without being detected. They have become stealthier over the years as a consequence of the ongoing struggle between attackers and system defenders. In order to explore the next step in rootkit evolution and to build strong defenses, we look at this issue from the point of view of an attacker. We construct Cloaker, a proof-of-concept rootkit for the ARM platform that is non-persistent and only relies on hardware state modifications for concealment and operation. A primary goal in the design of Cloaker is to not alter any part of the host operating system (OS) code or data, thereby achieving immunity to all existing rootkit detection techniques which perform integrity, behavior and signature checks of the host OS. Cloaker also demonstrates that a self-contained execution environment for malicious code can be provided without relying on the host OS for any services. Integrity checks of hardware state in each of the machine's devices are required in order to detect rootkits such as Cloaker. We present a framework for the Linux kernel that incorporates integrity checks of hardware state performed by device drivers in order to counter the threat posed by rootkits such as Cloaker.
A compiler framework for optimization of affine loop nests for gpgpus
Authors: Muthu Manikandan Baskaran, Uday Bondhugula, Sriram Krishnamoorthy, J. Ramanujam, Atanas Rountev, P. Sadayappan
Venue: Proceedings of the 22nd annual international conference on Supercomputing (2008)

GPUs are a class of specialized parallel architectures with tremendous computational power. The new Compute Unified Device Architecture (CUDA) programming model from NVIDIA facilitates programming of general purpose applications on their GPUs. However, manual development of high-performance parallel code for GPUs is still very challenging. In this paper, a number of issues are addressed towards the goal of developing a compiler framework for automatic parallelization and performance optimization of affine loop nests on GPGPUs: 1) approach to program transformation for efficient data access from GPU global memory, using a polyhedral compiler model of data dependence abstraction and program transformation; 2) determination of optimal padding factors for conflict-minimal data access from GPU shared memory; and 3) model-driven empirical search to determine optimal parameters for unrolling and tiling. Experimental results on a number of kernels demonstrate the effectiveness of the compiler optimization approaches developed.
Can priced options solve the exposure problem in sequential auctions?
Authors: Lonneke Mous, Valentin Robu, Han La Poutré
Venue: ACM SIGecom Exchanges (2008)

The exposure problem appears whenever an agent with complementary valuations bids to acquire a bundle of items sold sequentially, in independent auctions. In this letter, we review a possible solution that can help solve this problem, which involves selling options for the items, instead of the items themselves. We provide a brief overview of the state of the art in this field and discuss, based on recent results presented in [Mous et. al. 2008], under which conditions using option mechanisms would be desirable for both buyers and sellers, by comparison to direct auctioning of the items. The paper concludes with a brief discussion of further research directions in this field.
Optimization methods and stability of inclusions in Banach spaces
Authors: Diethard Klatte, Bernd Kummer
Venue: Mathematical Programming: Series A and B (2008)

Our paper deals with the interrelation of optimization methods and Lipschitz stability of multifunctions in arbitrary Banach spaces. Roughly speaking, we show that linear convergence of several first order methods and Lipschitz stability mean the same. Particularly, we characterize calmness and the Aubin property by uniformly (with respect to certain starting points) linear convergence of descent methods and approximate projection methods. So we obtain, e.g., solution methods (for solving equations or variational problems) which require calmness only. The relations of these methods to several known basic algorithms are discussed, and errors in the subroutines as well as deformations of the given mappings are permitted. We also recall how such deformations are related to standard algorithms like barrier, penalty or regularization methods in optimization.
Slide image retrieval: a preliminary study
Authors: Guo Min Liew, Min-Yen Kan
Venue: Proceedings of the 8th ACM/IEEE-CS joint conference on Digital libraries (2008)

We consider the task of automatic slide image retrieval, in which slide images are ranked for relevance against a textual query. Our implemented system, SLIDIR caters specifically for this task using features specifically designed for synthetic images embedded within slide presentation. We show promising results in both the ranking and binary relevance task and analyze the contribution of different features in the task performance.
How do bicyclists intercept moving gaps in a virtual environment?
Authors: Benjamin Chihak, Sabarish Babu, Timofey Grechkin, Christine Ziemer, James Cremer, Joseph Kearney, Jodie Plumert
Venue: Proceedings of the 5th symposium on Applied perception in graphics and visualization (2008)

Coordinating one's actions with the movements of other objects in the environments is important for both interception and avoidance tasks. Recent experiments show that performance in some interception tasks is well explained by a motion control strategy based on adjusting speed to maintain a constant bearing angle (CBA) between an individual's direction of motion and the object to be intercepted [Lenoir et al. 2002]. When the object and observer travel on intersecting, linear trajectories and the object travels with constant speed, then an observer employing the CBA strategy will move with constant speed.
Business transformation to SOA: aspects of the migration and performance and QoS issues
Authors: Liam O'Brien, Paul Brebner, Jon Gray
Venue: Proceedings of the 2nd international workshop on Systems development in SOA environments (2008)

Organizations face challenges to be more adaptable and transform to meet new customer demands with fewer resources and streamlining of its business activities. There is a growing move to introduce SOAs with their promise of cost-efficiency, agility, adaptability and legacy leverage. However there are many aspects of transforming an organization to use SOA and many obstacles and issues that the organization has to address when introducing SOAs. In this paper we outline some of the major aspects of SOA introduction and focus on some of the open issues that still need to be tackled. In the discussion on the various aspects of SOA introduction we focus in on performance and QoS which are major pieces to get right if the SOA implementation is to be successful. We outline some of the work that we are doing in this area and some problem areas where further research is needed.
A proportional differentiated QoS scheduling algorithm in OFDMA systems
Authors: Beom-Gon Yu, Kyoung-Duk Kim, Jitae Shin
Venue: Proceedings of the 2nd international conference on Ubiquitous information management and communication (2008)

Orthogonal Frequency Division Multiple Access (OFDMA) is considered as a key multiple access method in next generation mobile system. Tremendous research have been carried out in this field, especially focusing on various scheduling algorithm for users' quality of service (QoS). However, it is hard to fulfill multiple QoS parameters because these algorithms aim for focusing on satisfying a certain QoS parameter. In this paper, we propose a subcarrier allocation method that offers proportional QoS service to different classes of user while sustaining baseline users' QoS in OFDMA environment. Proposed algorithm can offer adaptive service to different user classes according to the classes' proportional rate ratio while satisfying user's minimum throughput. Simulation results show that the proposed scheduling algorithm has higher efficiency in differentiated resource allocation for premium service than previously proposed scheduling algorithms for QoS in such systems.
JWS: a flexible web service
Authors: Andrew Cho, Paresh Deva, Ewan Tempero
Venue: Proceedings of the thirty-first Australasian conference on Computer science - Volume 74 (2008)

Web services have been proposed as means to provide more convenient access to computation services. An issue that still must be dealt with is what to do if there is no web service with the desired functionality. Deploying a new web service requires expertise in the relevant technologies as well as access to a web services server. In this paper we present the Java Web Service, a web service that allows the provision of almost arbitrary functionality by means of uploading the functionality as a plug-in at run-time. Plug-ins can also be combined through a simple scripting mechanism.
Services surround you: Physical-virtual linkage with contextual bookmarks
Authors: Niels Henze, Ren&#x00e9; Reiners, Xavier Righetti, Enrico Rukzio, Susanne Boll
Venue: The Visual Computer: International Journal of Computer Graphics (2008)

Our daily life is pervaded by digital information and devices, not least the common mobile phone. However, a seamless connection between our physical world, such as a movie trailer on a screen in the main rail station and its digital counterparts, such as an online ticket service, remains difficult. In this paper, we present contextual bookmarks that enable users to capture information of interest with a mobile camera phone. Depending on the user&#x2019;s context, the snapshot is mapped to a digital service such as ordering tickets for a movie theater close by or a link to the upcoming movie&#x2019;s Web page.
No-reference noticeable blockiness estimation in images
Authors: Guangtao Zhai, Wenjun Zhang, Xiaokang Yang, Weisi Lin, Yi Xu
Venue: Image Communication (2008)

Blocking artifact is a prevailing degradation caused by the block-based Discrete Cosine Transform (BDCT) coding technique under low bit-rate conditions. In this paper, we propose an efficient no-reference noticeable blockiness estimation algorithm for BDCT coded images. The difference on block boundaries is first measured and then transformed into the block discontinuity map. We consider the effects of luminance adaptation and texture masking on blocking and integrate them using a nonlinear operator to form an overall masking map. This map is finally incorporated with the discontinuity map to generate Noticeable Blockiness Map (NBM), which can be used to guide perceptual quality assessment, codec parameter optimization, post-processing, etc. We have demonstrated the validity of the NBM through its applications in no-reference image quality assessment and image deblocking.
Empirical evaluation of VoIP aggregation over a fixed WiMAX testbed
Authors: Kostas Pentikousis, Esa Piri, Jarno Pinola, Frerk Fitzek, Tuomas Nissilä, Ilkka Harjula
Venue: Proceedings of the 4th International Conference on Testbeds and research infrastructures for the development of networks & communities (2008)

The WiMAX Reference Network Architecture can be used in point-to-point and point-to-multipoint network topologies, and is suitable for providing last-mile, building-to-building, and residential broadband connectivity. Another major application, and the main focus of this study, is the use of fixed WiMAX as backhaul for voice and data services. We evaluate voice over IP (VoIP) performance over a fixed WiMAX testbed and quantify the benefits from employing applicationand network-level aggregation. We examine such aggregation schemes using our fixed WiMAX testbed and report the results for both uplink and downlink. If we use objective mean opinion scores (MOS) as the main gauge of overall performance, application-layer aggregation appears to be the best scheme, allowing our fixed WiMAX testbed to sustain nearly three times more flows in the downlink and over two times more flows in the uplink than when no aggregation is used, at comparable MOS values.
Introduction to recommender systems
Authors: Joseph A. Konstan
Venue: Proceedings of the 2008 ACM SIGMOD international conference on Management of data (2008)

Recommender systems help users find the information, products, and other people they most want to find. This tutorial provides participants with a hands-on learning experience about using recommender system technologies. After completing this tutorial, participants will understand the range of technologies being used for recommender systems, including collaborative filtering, rules-based systems, and information filtering.
Performance evaluation of supercomputers using HPCC and IMB Benchmarks
Authors: Subhash Saini, Robert Ciotti, Brian T. N. Gunney, Thomas E. Spelce, Alice Koniges, Don Dossa, Panagiotis Adamidis, Rolf Rabenseifner, Sunil R. Tiyyagura, Matthias Mueller
Venue: Journal of Computer and System Sciences (2008)

The HPC Challenge (HPCC) Benchmark suite and the Intel MPI Benchmark (IMB) are used to compare and evaluate the combined performance of processor, memory subsystem and interconnect fabric of five leading supercomputers-SGI Altix BX2, Cray X1, Cray Opteron Cluster, Dell Xeon Cluster, and NEC SX-8. These five systems use five different networks (SGI NUMALINK4, Cray network, Myrinet, InfiniBand, and NEC IXS). The complete set of HPCC Benchmarks are run on each of these systems. Additionally, we present Intel MPI Benchmarks results to study the performance of 11 MPI communication functions on these systems.
A web-based multi-agent system for distributed digital manufacturing
Authors: M. Mahesh, S. K. Ong, A. Y. C. Nee
Venue: International Journal of Computer Integrated Manufacturing (2007)

A framework for a web-based multi-agent system (WebMAS) is proposed to facilitate collaborative product development and production among geographically distributed functional agents using digitalized information. Considering the complexity of products created in a distributed manufacturing scenario, this often requires close collaboration among a number of facilities. In this research, a prototype system where different distributed functional agents, namely, a manufacturability evaluation agent, manufacturing resource agent, process-planning agent, manufacturing scheduling agent, shop-floor agent, fault diagnosis agent, etc., interact coherently to realize the development of physical parts. With specific agents having unique functionalities, a manufacturing managing agent acts as the centre of the system thus coordinating the activities of the participating agents while ensuring seamless work flow and collaboration. This facilitates optimization of the part production cycle from product design to final manufacturing because all the production procedures are correlated and considered logically. The agents communicate through the knowledge query manipulation language, which includes many pre-defined performatives to aid the participating agents in carrying out their tasks intelligently by interpreting commands from one another. In this paper, a case study based on the developed prototype WebMAS system is discussed to illustrate the system.
Nanophotonic crystals with chiral elements by a hot embossing process in SU-8
Authors: Bing-Rui Lu, Jing Wan, Shen-Qi Xie, Zhen Shu, Yan Sun, Yifang Chen, Xin-Ping Qu, Ran Liu
Venue: Microelectronic Engineering (2008)

We report a novel nanoprocess to fabricate 2D metallic and non-metallic nanophotonic crystals on SU-8 using hot embossing combining with a UV-curing process. The fabricated photonic crystals were characterized by optical diffraction experiments. Theoretical simulation of the light diffraction through such kind of artificial crystals agrees with the measured optical property very well, indicating that the developed fabrication technique is able to produce large area nanosize photonic crystals at economic costs. The success of this work not only provides scientists with a good opportunity to pioneer novel photonic physics in metallic and non-metallic chiral as well as photonic crystal systems, but also bridges the gap between laboratory and industrial application for mass production of photonic nanostuctures.