ppxscal/embedding_network huggingface dataset:
Service value properties for service ecosystems: a reference model and a modeling guideline
Authors: Gregor Scheithauer, Stefan Augustin, Guido Wirtz
Venue: Proceedings of the International Workshop on Enterprises & Organizational Modeling and Simulation (2009)

With the rise of service-oriented computing and web service ecosystems, services and their electronic descriptions become crucial to foster significant value propositions toward potential service consumers. While there exist ample technical specifications to describe web services, conceptual approaches are rare. On top of this, an alignment between business models and information technology is lacking. This paper is a step toward this direction in that it offers a reference model to classify service value descriptions depending on their purpose, presents a generic model for service properties, proposes two meta models for conceptual modeling, and finally introduces a modeling guideline.
Twilight City: a virtual environment for MOUT
Authors: S. P. Zhou, S.-P. Ting, Z. Q. Shen, L. B. Luo
Venue: International Journal of Computers and Applications (2008)

We describe our work on Twilight City, a virtual training environment for Military Operations on Urbanized Terrain (MOUT). MOUT are often characterized by building-to-building, room-to-room, and person-to-person close combat, therefore the virtual training environment for MOUT requires high fidelity in 3D graphics and realistic behaviors of various objects. Twilight City is constructed on a commercial multi-player first-person shooter (FPS) game engine, the Unreal Tournament (UT). Various modifications to the UT game engine have been made to incorporate various aspects in real MOUT scenarios. Case studies show that the AI bots are able to demonstrate some human-like tactical behavior. Human factor tests are conducted to evaluate the performance of Twilight City. The results demonstrate the effectiveness of Twilight City as an urban warfare simulation environment. The lessons learned from these experiments are also discussed which provide directions for future improvement.
Widespread but not universal: improving the typological coverage of the grammar matrix
Authors: Emily M. Bender
Venue:  (2009)

The LinGO Grammar Matrix provides a foundation for building grammars of natural languages in HPSG. It includes a web-based questionnaire that allows a linguist to describe a natural language, and then creates a starter grammar for that language based on the answers. In this dissertation, I describe improvements I have made to the typological coverage of this system, including support for core case marking, agreement in person, number, and gender, direct-inverse languages, and a lexicon containing an arbitrarily large number of lexical types, lexical items, and inflectional morphemes. 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
One Laptop per Child: a misdirection of humanitarian effort
Authors: David Purington
Venue: ACM SIGCAS Computers and Society (2010)

The age-old adage "Give a man a fish; he'll eat for a day. Teach a man to fish he'll eat for the rest of his days", has truly manifested itself in Nicholas Negroponte's One Laptop per Child program. His organization seeks "To create educational opportunities for the world's poorest children by providing each child with a rugged, low-cost, low-power, connected laptop with content and software designed for collaborative, joyful, self-empowered learning" (OLPC Mission Statement). While it is seemingly a noble humanitarian effort for the enhancement of education, support for the "$100 laptop" has fallen short of its stated goal with only twenty-eight participating countries. The fact that only a limited number of countries are willing to enter the program demonstrates that it does not address the majority of problems faced by developing nations. Inadequate education is one of many pressing social concerns, but its necessity should not be placed above the immediate needs of developing nations. And for an organization devoted to a non-survival-essential cause to pursue such an ambitious objective brings its social significance and ethics under question.
Brief paper: Delay-dependent robust H∞ filtering for uncertain discrete-time singular systems with interval time-varying delay
Authors: Jong Hae Kim
Venue: Automatica (Journal of IFAC) (2010)

This paper focuses on the delay-dependent robust H"~ filtering for uncertain discrete-time singular systems with interval time-varying delay. The uncertainty considered is a convex compact set of polytopic type. The purpose is the design of a linear robust H"~ filter such that the resulting filtering error singular system is regular, causal, and asymptotically stable with a H"~ norm bound. By establishing a finite sum inequality based on quadratic terms, a new delay-dependent bounded real lemma (BRL) for delayed singular systems is derived. Based on the derived BRL, a sufficient condition for the solvability of this problem is obtained in terms of linear matrix inequality (LMI) without decomposing the original system matrices. Also, it is shown that the proposed filter design method is general for both singular systems and non-singular systems. Finally, illustrative examples are presented to show the applicability of the proposed method.
Context-aware access control in pervasive environments using semantic-based policies
Authors: Anand Dersingh
Venue:  (2009)

Computing is moving towards pervasive environments in which system components are expected to seamlessly integrate and deliver services in an anywhere and anytime fashion. In addition, technologies are expected to remain invisible from a user's point of view. The increasing use of portable devices helps to fulfill these expectations and creates a situation where a user's context, such as a user activity, is more dynamic. This introduces a new class of services called context-aware services which take the user's context into account. The idea of using contextual information comes from human to human communications where humans are able to use implicit situational information, or context, to increase the effectiveness of the communications. In terms of access management, in pervasive environments, it is also necessary to minimize access control complexities and at the same time to allow users to gain access to services pervasively without difficulties. Policy based network management approaches address these problems by providing a means by which an administrative process can be simplified and largely automated. However, pervasive environments are founded on context, which is dynamic and unpredictable, and cannot be configured beforehand. A challenge lies in the fact that there needs to be a policy system that fully understands and can interpret high-level notions. In pervasive environments, these high-level notions refer to contexts of the situation which can change unpredictably and must be interpreted semantically to maintain proper access control. This thesis addresses this challenge by designing and implementing a framework that supports a separation of context management and access management. Context management refers to the process of modeling, representing, monitoring, updating, and sharing contexts semantically by using Semantic Web languages. Access management focuses on using the contexts in attribute-based access control policies and enforcing them properly. A policy system is implemented by extending a standard attribute-based access control policy language, XACML, to incorporate the semantically defined contexts. This thesis is validated by a proof of concept implementation with performance measurement of the response time of the context management system and an analytical comparison of several different approaches compared with the approach taken in this thesis. 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
Prediction of Marshall test results for polypropylene modified dense bituminous mixtures using neural networks
Authors: Serkan Tapkın, Abdulkadir Çevik, ín Uşar
Venue: Expert Systems with Applications: An International Journal (2010)

This study presents an application of neural networks (NN) for the prediction of Marshall test results for polypropylene (PP) modified asphalt mixtures. PP fibers are used to modify the bituminous binder in order to improve the physical and mechanical properties of the resulting asphaltic mixture. Marshall stability and flow tests were carried out on specimens fabricated with different type of PP fibers and also waste PP at optimum bitumen content. It has been shown that the addition of polypropylene fibers results in the improved Marshall stabilities and Marshall Quotient values, which is a kind of pseudo stiffness. The proposed NN model uses the physical properties of standard Marshall specimens such as PP type, PP percentage, bitumen percentage, specimen height, unit weight, voids in mineral aggregate, voids filled with asphalt and air voids in order to predict the Marshall stability, flow and Marshall Quotient values obtained at the end of mechanical tests. The explicit formulation of stability, flow and Marshall Quotient based on the proposed NN model is also obtained and presented for further use by researchers. Moreover parametric analyses have been carried out. The results of parametric analyses were used to evaluate mechanical properties of the Marshall specimens in a quite well manner.
Proceedings of the International Workshop on Enterprises & Organizational Modeling and Simulation
Venue: International Workshop on Enterprises & Organizational Modeling and Simulation (2009)

In the era of continuous changes in the internal organizational settings and external business environments, such as new regulations and business opportunities, modern enterprises are subject to extensive research and study. A challenge that is already characterized as the futuristic aspect of the 21st century enterprise is complexity and agility. With globalization of economy, business processes are scattered not only throughout the labyrinth of their own enterprise, but also across different enterprises, and far beyond the national boundaries. The growing phenomenon of business process outsourcing is an obvious manifestation of this trend. Increasing competition, customer demands, and emerging technologies also take their toll on modern enterprise by requiring swift adaptation to the changes. Training of employees to learn their roles and see the role of others as they are enacted, imitating group decisions, and creating realistic virtual situations are other aspects of the overall study about modern enterprises. All this puts enterprises on ever-improving, redesigning, and adapting track that requires adequate tools, methods and approaches. As a complex socio-technical phenomenon, a profound understanding, analysis, and design of a modern enterprise and its interwoven business processes require tools that are effective, efficient, and practice proven. 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
Human coordination of robot teams: an empirical study of multimodal interface design
Authors: Juan Gilbert
Venue:  (2009)

Human Robot Interaction is an emerging area of interdisciplinary research that requires contributions from the areas of robotics, human computer interaction, cognitive sciences, multimodal interfaces and others. Due to the interdisciplinary nature of human robot interaction, the research proposed here advances not only the body of knowledge within human robot interaction but also in user interface design, information fusion, visual display and multimodal interaction. This research will focus on a comparative study between multimodal interfaces. Each interface style will require information fusion and multimodal interaction to provide the user with appropriate capabilities and awareness to manage their robot team. The study will determine which interface improves the user's ability to efficiently manage a robot team. The research proposed here will build upon findings, solutions and results provided by existing literature. This research will focus on the following human performance characteristics: (1) Mental Workload; (2) Task Completion Time; (3) Task Completion Rate. 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
Geometry of complex monge-ampere equations
Authors: Shing-Tung Yau
Venue:  (2009)

The K&auml;hler-Ricci flow is studied on compact K&auml;hler manifolds with positive first Chern class, where it reduces to a parabolic complex Monge-Ampere equation. It is shown that the flow converges to a K&auml;hler-Einstein metric if the curvature remains bounded along the flow, and if the manifold is stable in an algebro-geometric sense. On a compact Calabi-Yau manifold there is a unique Ricci-flat K&auml;hler metric in each K&auml;hler cohomology class, produced by Yau solving a complex Monge-Ampere equation. The behaviour of these metrics when the class degenerates to the boundary of the K&auml;hler cone is studied. The problem splits into two cases, according to whether the total volume goes to zero or not. On a compact symplectic four-manifold Donaldson has proposed an analog of the complex Monge-Amp&egrave;re equation, the Calabi-Yau equation. If solved, it would lead to new results in symplectic topology. We solve the equation when the manifold is nonnegatively curved, and reduce the general case to bounding an integral of a scalar function. 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
Efficient thermal management for multiprocessor systems
Authors: Tajana Simunic Rosing
Venue:  (2009)

High temperatures and large thermal variations on the die create severe challenges in system reliability, performance, leakage power, and cooling costs. Designing for worst-case thermal conditions is highly costly and time-consuming. Therefore, dynamic thermal management methods are needed to maintain safe temperature levels during execution. Conventional management techniques sacrifice performance to control temperature and only consider the hot spots, neglecting the effects of thermal variations. This thesis focuses on developing performance-efficient techniques to achieve safe and balanced thermal profiles on multiprocessor system-on-chips (MPSoCs). Modeling performance, temperature, and reliability of MPSoCs with high accuracy and reasonable simulation time is a challenge, because we need to keep track of instruction-level activities and also simulate sufficiently long real-time execution to have meaningful reliability estimates. The first contribution of this thesis is a fast simulation framework, which evaluates reliability of runtime policies or design-time decisions accurately in a matter of hours&mdash;whereas traditional architecture-level simulators would have to run for days. Job scheduling on an MPSoC has a significant impact on temperature and reliability. For systems with a priori known workloads, this thesis proposes a scheduling optimization method which outperforms other static energy or temperature management techniques in terms of reducing thermal hot spots and gradients. However, having an accurate design-time workload estimate is not possible for most systems. This work introduces dynamic techniques to address runtime variations in workload. The key aspects of these dynamic techniques are low-performance impact and adaptation capability. Reacting after thermal events occur reduces the efficiency of thermal management policies. This thesis proposes a novel proactive management approach to address this issue, and shows that utilizing a thermal forecast for temperature-aware scheduling achieves significant gains in both temperature and performance. All the novel management policies introduced in this thesis are evaluated using an experimental framework based on real-life systems and workloads. In the experiments on an UltraSPARC T1 processor, proactive thermal management achieves remarkable results with an average 60% reduction in hot spot occurrences, 80% reduction in spatial gradients and 75% reduction in thermal cycles in comparison to reactive thermal management, while also improving performance. 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
Access and service convergence over the mobile internet - A survey
Authors: Peyman TalebiFard, Terrence Wong, Victor C. M. Leung
Venue: Computer Networks: The International Journal of Computer and Telecommunications Networking (2010)

Next generation heterogeneous wireless networks are expected to interwork with Internet Protocol (IP)-based infrastructures. Conventional network services operate like silos in that a specific set of services are offered over a specific type of access network. It is desirable for users to be able to roam between fixed and mobile networks that employ different access technologies. Therefore, mobility management with quality of service (QoS) support is of particular importance and one of the driving forces of convergence. Since service providers often provide more than one service to their subscribers, it is important to facilitate convergence of network charging architecture through a common charging framework. One of the main issues of IP-based convergence is security and privacy. This requires coordination of different security policies in diverse networks that have different security levels and capabilities. The business case for migration to an IP-based platform motivates operators to deliver more powerful services for customers as well as a better user experience. This paper provides an overview of converged mobile Internet architectures and their implications on QoS, charging/billing and security, as well as emerging business models for telecommunication services.
Fuzzy preference based rough sets
Authors: Qinghua Hu, Daren Yu, Maozu Guo
Venue: Information Sciences: an International Journal (2010)

Preference analysis is an important task in multi-criteria decision making. The rough set theory has been successfully extended to deal with preference analysis by replacing equivalence relations with dominance relations. The existing studies involving preference relations cannot capture the uncertainty presented in numerical and fuzzy criteria. In this paper, we introduce a method to extract fuzzy preference relations from samples characterized by numerical criteria. Fuzzy preference relations are incorporated into a fuzzy rough set model, which leads to a fuzzy preference based rough set model. The measure of attribute dependency of the Pawlak's rough set model is generalized to compute the relevance between criteria and decisions. The definitions of upward dependency, downward dependency and global dependency are introduced. Algorithms for computing attribute dependency and reducts are proposed and experimentally evaluated by using two publicly available data sets.
Supply chain teaming: a knowledge intensive approach for finding and selecting partners
Authors: Yu-Liang Chi
Venue: Proceedings of the International Workshop on Enterprises & Organizational Modeling and Simulation (2009)

This study shows how the semantic rules in conjunction with ontologies can be used for managing the intricate network among supply chains partners. Nowadays, an enterprise is no longer a self-sufficient firm but an integral part of supply chain. When structuring a supply chain network, it is problematic to identify who the partners are across multiple supply chain tiers. Worst, an inclusion of potential partners may cause the links to become an intricate network. We introduce ontological knowledge framework which first building concepts for defining enterprises and products, describing instances with properties as facts, and developing semantic rules to infer inter- and intra relationships among facts. The major advantage of this design is its ease to implement that individual firm and its parts manage their direct and known knowledge. Small examples were presented using ontology and semantic rules.
Brief paper: Full-order observer design for a class of port-Hamiltonian systems
Authors: A. Venkatraman, A. J. van der Schaft
Venue: Automatica (Journal of IFAC) (2010)

We consider a special class of port-Hamiltonian systems for which we propose a design methodology for constructing globally exponentially stable full-order observers using a passivity based approach. The essential idea is to make the augmented system consisting of the plant and the observer dynamics to become strictly passive with respect to an invariant manifold defined on the extended state-space, on which the state estimation error is zero. We first introduce the concept of passivity of a system with respect to a manifold by defining a new input and output on the extended state-space and then perform a partial state feedback passivation which leads to the construction of the observer. We then illustrate this observer design procedure on two physical examples, the magnetic levitation system and the inverted pendulum on the cart system.
Efficient certificate-based signcryption scheme from bilinear pairings
Authors: F. Li, X. Xin, Y. Hu
Venue: International Journal of Computers and Applications (2008)

Signcryption is a public key cryptographic primitive that performs digital signature and public key encryption simultaneously, at lower computational costs and communication overheads than the signature-then-encryption approach. In this paper, an efficient certificate-based signcryption scheme based on bilinear pairings is proposed. As compared to traditional and identity-based signcryption schemes, the proposed scheme has the following advantages: it provides implicit certification; it does not have the private key escrow feature of identity-based signcryption schemes, we also analyze the proposed scheme from security and performance points of view.