ppxscal/embedding_network huggingface dataset:
Improving retention and graduate recruitment through immersive research experiences for undergraduates
Authors: Teresa Dahlberg, Tiffany Barnes, Audrey Rorrer, Eve Powell, Lauren Cairco
Venue: Proceedings of the 39th SIGCSE technical symposium on Computer science education (2008)

Research experiences for undergraduates are considered an effective means for increasing student retention and encouraging undergraduate students to continue on to graduate school. However, managing a cohort of undergraduate researchers, with varying skill levels, can be daunting for faculty advisors. We have developed a program to engage students in research and outreach in visualization, virtual reality, networked robotics, and interactive games. Our program immerses students into the life of a lab, employing a situated learning approach that includes tiered mentoring and collaboration to enable students at all levels to contribute to research. Students work in research teams comprised of other undergraduates, graduate students and faculty, and participate in professional development and social gatherings within the larger cohort. Results from our first two years indicate this approach is manageable and effective for increasing students' ability and desire to conduct research.
Secure DACS Scheme
Authors: Kazuya Odagiri, Rihito Yaegashi, Masaharu Tadauchi, Naohiro Ishii
Venue: Journal of Network and Computer Applications (2008)

When customers with different membership and position use computers as in the university network systems, it often takes much time and efforts for them to cope with the change of the system management. This is because the requirements for the respective computer usage are different in the network and security policies. In this paper, a new destination addressing control system scheme (DACS Scheme) for the university network services is shown. The DACS Scheme performs the network services efficiently through the communication management of a client. As the characteristic of DACS Scheme, only the setup modification is required by a system administrator, when the configuration change is needed in the network server. Then, the setup modification is unnecessary by a customer, which shows a merit for both a system administrator and a customer. However, there is a problem to be solved. In existing DACS Scheme, it is assumed that DACS Client for controlling the communication must be implemented on all clients. If the client without DACS Client is connected to the network, each network server can be accessed from the client. Therefore, in this paper, secure DACS Scheme with the function to prevent the communication from the client without DACS Client is proposed and examined.
Towards a unified framework for the monitoring and recovery of BPEL processes
Authors: Luciano Baresi, Sam Guinea, Liliana Pasquale
Venue: Proceedings of the 2008 workshop on Testing, analysis, and verification of web services and applications (2008)

Web services have proven to be a viable solution for interoperability issues. Since end users do not buy services, but only interact with them remotely, such complex systems end up having a distributed ownership, meaning different parts of a system can evolve independently. This has brought researchers to concentrate on run-time management issues such as dynamic monitoring and self-recovery. However, we advocate that no silver bullet has been found. All the major approaches have advantages and disadvantages. In this paper we propose a unified framework for monitoring and recovery that provides a clear separation between data collection and analysis, a common management infrastructure, and a common recovery system. Separating monitoring from recovery allows the framework to integrate different monitoring approaches seamlessly through a plug-in approach. The common management infrastructure allows us to dynamically manage the multiple monitoring approaches being used, while the common recovery approach allows us to activate advanced recovery techniques both on process instances and process definitions.
Multi-document summarization using cluster-based link analysis
Authors: Xiaojun Wan, Jianwu Yang
Venue: Proceedings of the 31st annual international ACM SIGIR conference on Research and development in information retrieval (2008)

The Markov Random Walk model has been recently exploited for multi-document summarization by making use of the link relationships between sentences in the document set, under the assumption that all the sentences are indistinguishable from each other. However, a given document set usually covers a few topic themes with each theme represented by a cluster of sentences. The topic themes are usually not equally important and the sentences in an important theme cluster are deemed more salient than the sentences in a trivial theme cluster. This paper proposes the Cluster-based Conditional Markov Random Walk Model (ClusterCMRW) and the Cluster-based HITS Model (ClusterHITS) to fully leverage the cluster-level information. Experimental results on the DUC2001 and DUC2002 datasets demonstrate the good effectiveness of our proposed summarization models. The results also demonstrate that the ClusterCMRW model is more robust than the ClusterHITS model, with respect to different cluster numbers.
Contract-Based Approach to Analyze Software Components
Authors: A. Zitouni, L. Seinturier, M. Boufaida
Venue: Proceedings of the 13th IEEE International Conference on on Engineering of Complex Computer Systems (2008)

Component-based software development focuses on building large software systems by integrating existing software components to reduce cost, risk and time. However, behavioural and compositional conflicts among components constitute a crucial barrier to successful software composition. In this paper, we present a contract-based approach to analyze and model the properties of components and their composition in order to detect and correct composition errors. With this approach we characterize the structural, interface and behavioural aspects, and a specific form of evolution of these components. Enabling this, we propose the use of the LOTOS language as an Architecture Description Language (ADL) for formalising these aspects.
A novel DTC scheme for a five-level voltage Source inverter with GTO thyristors
Authors: R. Zaimeddine, E. M. Berkouk
Venue: Proceedings of the 9th WSEAS International Conference on Systems (2005)

The object of this paper is to study a new control structure for sensorless induction machine dedicated to electrical drives using a three-level voltage source inverter (VSI). The output voltages of the three-level VSI can be represented by four groups : the zero voltage vectors, the small voltage vectors, the middle voltage vectors and the large voltage vectors in (d, q) plane. Then, the amplitude and the rotating velocity of the flux vector can be controlled freely. Both fast torque and optimal switching logic can be obtained. The selection is based on the value of the stator flux and the torque. This paper investigates a new control structure using a five-level voltage source inverter. Compared to classical Field Oriented Control (FOC), which necessitates generally three feedback loops with PI regulators, a current-regulated PWM converter, and two coordinate transformations, Direct Torque Control (DTC) uses only a couple of hysteresis comparators to perform both torque and flux dynamic control. Both approaches are simulated for a induction motor. The results obtained with a novel DTC structure show superior performances over the FOC one without need to any mechanical sensor.
The problem of equivalent transformations for homogeneous multitape automata
Authors: V. E. Khachatryan
Venue: Programming and Computing Software (2008)

A complete system of equivalent transformations is constructed for homogeneous multitape automata. Decidability of the equivalence problem is established.
Modeling of NBTI-Induced PMOS Degradation under Arbitrary Dynamic Temperature Variation
Authors: Bin Zhang, Michael Orshansky
Venue: Proceedings of the 9th international symposium on Quality Electronic Design (2008)

Negative bias temperature instability (NBTI) is one of the primary limiters of reliability lifetime in nano-scale integrated circuits. NBTI manifests itself in a gradual increase in the magnitude of PMOS threshold voltage, resulting in the degradation of circuit performance over time. NBTI is highly sensitive to operating temperature, making the amount of degradation strongly dependent on the thermal history of the chip. In order to accurately predict the amount of threshold voltage increase, the precise temperature profile must be utilized. The existing models are based on the simplified analysis which assumes that the temperature takes up to two possible fixed values over time. These models are inaccurate when predicting the impact of continuously-changing temperature that spans a large range. Our experiments show that proposed model accounting for temperature variation provides a significantly tighter bound for the simulation than that from the model that ignores the temperature variation and assumes a constant (worst-case) temperature. In our experiment, the amount of degradation predicted by the proposed dynamic temperature model is on average 46% less conservative compared to the model based on the worst-case temperature.
A Transport-layer Approach for Achieving Predictable Throughput for Internet Applications
Authors: Go Hasegawa, Kana Yamanegi, Masayuki Murata
Venue: Proceedings of the Seventh International Conference on Networking (2008)

We propose a transport-layer approach to provide predictable throughput for applications requiring stable bandwidth resource, such as video streaming and VoIP. The proposed mechanism deploys an end-to-end approach: it dynamically sets the increase degree of the congestion window size of a TCP connection according to the measurement results of the available bandwidth of the network path, which is obtained by inline network measurement technique developed in our research group. In the present paper, we briefly introduce the proposed mechanism and show the performance evaluation results in the experimental network and in the commercial Internet environment. We exhibit that the proposed mechanism can achieve the required throughput with high probability without any support from intermediate network nodes.
Bringing IT All Together
Venue: Queue (2007)

A piecemeal approach to building data centers that relies on commodity servers, switches and systems management software only leads to inefficient systems that add unnecessary cost and management overhead to IT operations. In an interview with Queuecast host Mike Vizard, Liquid Computing CTO and co-founder Mike Kemp offers a fresh approach to enterprise computing. 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
Heme Oxygenase Induction Confers Cellular Adaptive Response against Multi-walled Carbon Nanotubes-induced Cytotoxicity in A549 Cell
Authors: Liming Zhong, Shefang Ye, Yihui Wu, Qiqing Zhang
Venue: Proceedings of the 2008 International Conference on BioMedical Engineering and Informatics - Volume 02 (2008)

Carbon nanotubes currently attract intense attention for various biomedical applications due to their large surface areas, high electrical conductivity, and excellent strength. However, these attractive properties of nanomaterials are also the main factors for their potential toxicity. The present study was undertaken to determine the toxicity exhibited by multi-walled carbon nanotubes (MWCNT) in A549 lung epithelial cells. Treatment with increasing doses of MWCNT decreased the cell viability. The glutathione concentration decreased and intracellular reactive oxygen species (ROS) increased in a dose- and time-dependent manner, suggesting that the cytotoxicity on A549 cells was due to oxidative stress. Expression of heme oxygenase (HO)-1, a redox regulator and heat shock protein, increased with dose after MWCNT treatment. Pretreated with zinc protoporphyrin IX (ZnPP IX), a competitive HO inhibitor, underwent cell viability decrease and ROS accumulation increase to a greater extent than cells with MWCNT treatment alone, but these effects were reversed by co-treatment with bilirubin, a product of HO catalysis. Taken together, these findings suggest that MWCNT induce oxidative stress and HO-1 expression in A549 cells, and HO-1 induction may confer a cellular adaptive response against MWCNT-induced cytotoxicity.
Boosting Markov Reward Models for Probabilistic Security Evaluation by Characterizing Behaviors of Attacker and Defender
Authors: Zonghua Zhang, Farid Nait-Abdesselam, Pin-Han Ho
Venue: Proceedings of the 2008 Third International Conference on Availability, Reliability and Security (2008)

While Markov Reward Models (MRMs) have been widely used for system dependability evaluation, their application for evaluating security still poses as a challenge. It is observed that attacker behavior plays a key role in causing models of security evaluation to be complicated. Another observation is that representing attacker behavior in terms of attack effects instead of attack itself enables the system security to be indirectly evaluated by identifying families of attacks rather than individual instantiations. Furthermore, an attacker behavior tends to be affected by defense mechanisms (we say defender) due to their close interactions. These observations motivate us to boost MRMs to the security context by extracting the behaviors of attacker and defender. To do that, we present a general yet simple state-based approach to characterizing and inferring the behaviors of attackers and defenders in typical network attacks. It specifically contributes in two folds: 1) two objective-oriented models are developed to measure the attacker's and defender's behaviors, respectively; 2) the objectives, actions, and the resultant effects by the attacker and defender, along with the underlying system states, are then integrated and formulated as Partially Observable Markov Decision Processes. The developed models and analysis allow the behaviors of attacker and defender to be characterized in a fine-grained way, and specific attack-defense strategies to be inferred approximately via existing model-based algorithms. The system security hereby can be indirectly validated on the basis of the aggregated effects resulted from the interactive behaviors of attacker and defender. A real trace study is conducted to show feasibility and effectiveness of our proposed approach.
Breast cancer malignancy identification using self-organizing map
Authors: Sudhir D. Sawarkar, Ashok A. Ghatol
Venue: Proceedings of the 5th WSEAS International Conference on Circuits, Systems, Electronics, Control & Signal Processing (2006)

An artificial neural network (ANN) is an information-processing paradigm inspired by the way the densely interconnected, parallel structure of the mammalian brain processes information. The key element of the ANN paradigm is the novel structure of the information processing system. Learning in ANN typically occurs by example through training, or exposure to a set of input/output data where the training algorithm iteratively adjusts the connection weights. The Kohonen self-organizing map neural network performs a mapping from a continuous input space to a discrete output space, preserving the topological properties of the input. For training and testing the neural network various databases available on the Internet as well as gathered information from hospitals is used.
Permutation Routing in All-Optical Multistage Clos Network
Authors: Ming-Jye Lee, Chi-Chang Chen, Chien-Ning Yeh
Venue: Proceedings of the Fifth International Conference on Information Technology: New Generations (2008)

Permutation routing is a popular communication pattern in the interconnection networks. Most of previous works consider routings on Multistage Interconnection Networks (MINs) which consist of 2x2 switches. We considered all-optical rearrangeable permutation routing for Clos networks. The signal in the optical switch with the same wavelength will cause the crosstalk problem, so our proposed algorithm is to rearrange the same wavelength signals, so that no duplicate wavelength in any single middle switch. To avoid wavelength crosstalk, we use wavelength domain approach, and then to solve blocking condition by space domain approach.
Perceptual evaluation of position and orientation context rules for pedestrian formations
Authors: Cathy Ennis, Christopher Peters, Carol O'Sullivan
Venue: Proceedings of the 5th symposium on Applied perception in graphics and visualization (2008)

In this paper, we evaluate the effects of position and orientation on the plausibility of pedestrian formations. In a perceptual study we investigated how humans perceive characteristics of virtual crowds in static scenes reconstructed from annotated still images where the orientations and positions of the individuals have been modified. We found that by applying rules based on the contextual information of the scene, such as the type of scene being portrayed, the presence of nearby individuals and objects and the constraints of the walking areas in the scene, we improved the perceived realism of the crowd formations. Results from this study can help in the creation of virtual crowds, such as computer graphics pedestrian models or architectural scenes.
Full-order and multimode flutter analysis using ANSYS
Authors: X. G. Hua, Z. Q. Chen
Venue: Finite Elements in Analysis and Design (2008)

This paper presents the full-order and multimode methods for analyzing coupled flutter of long-span bridges using commercial finite element (FE) package ANSYS. In the full-order method of flutter analysis, a novel FE model is developed to model the coupled wind-bridge system, in which a specific user-defined Matrix27 element in ANSYS is adapted to model the aeroelastic forces and its stiffness or damping matrices are parameterized by wind velocity and vibration frequency. Variation of complex eigenvalues of the coupled system with wind velocity is then depicted by using this model together with complex eigenvalue analysis, and flutter instability can be determined from the variation diagram. In the multimode method, equations of motion for the coupled wind-bridge system are first represented using a modal superposition technique. This formulation leads to a single-parameter searching technique without iteration to determine the conditions of flutter instability when structural damping is not considered in solution. The contribution of participating modes to flutter instability is given in terms of modal amplitude and modal energy in the multimode method. Numerical studies are provided to validate the developed methods as well as to demonstrate both the procedures for flutter analysis using ANSYS. The proposed methods enable the bridge designers and engineering practitioners to analyze bridge flutter in commercial FE package ANSYS.
Software engineering approach in the design and development of the industrial automation systems
Authors: Adnan Salihbegovic, Zoran Cico, Vlatko Marinkovi, Elvedin Karavdi
Venue: Proceedings of the 2008 international workshop on Software Engineering in east and south europe (2008)

The objective of the paper is to present generalized approach in design and development of industrial automation systems based on software engineering principles including unified modeling language UML and concept of reusable software and COTS software modules. The said generalization is illustrated on the case example of the design and engineering of the software for one real life project that Faculty software engineering group has completed for local engineering firm. The said project involves monitoring and control system for the refinery oil terminal with truck loading and pipeline shipping of petroleum products. System architecture is based on PLC controllers and can be part of the any larger, network-based, SCADA/HMI system. In the first part of the paper, we present the overall hardware architecture for the system as well as its software structure described with variety of UML diagrams presenting underlying processing logic and communication and human interfaces between systems distributed parts. These formal representations of the system functional requirements are then used, in conjunction with the software tools, for configuring and programming of the controllers as well as designing and coding its interface modules and drivers and HMI interface screens and underlying functionalities. The modeling of both automatic control sequences (for truck loading applications) and programming units that enable operator input from HMI screens (for pipeline shipping) are presented to demonstrate the idea of reusable software approach, further applied in modeling of the user-designed building blocks for the control and monitoring of pumps and MOV's (Motor Operated Valves). Furthermore, some of the real-time performance requirements on communication subsystem and protocols are first defined and tested in developed UML RTD diagrams and then implemented and tested in the target hardware and software integration in commissioning and start-up phase of the developed system.
Automated Ontological Web Service Management A New Approach in Semantic Web
Authors: Sedigheh Khajouei Nejad, Amir Najafi-Ardebili, Ali Ghazinezhad, Vahid Salmani
Venue: Proceedings of the 2008 Second Asia International Conference on Modelling & Simulation (AMS) (2008)

Nowadays, an increasing amount of companies and organizations only implement their core business and outsource other application services over Internet. Besides, statistics show surprising details on the decline in the growth of the number of web servers being set up throughout the world. Real-Time characteristic of the web is an important issue in the use of web services. Moreover, the process of web service registration is time consuming and needs human interference. In this paper a framework was proposed which discovers and registers new web services automatically. In addition an ontological fuzzy graph, which is used for web service composition, was presented. This graph is formed and modified during the update of the main registry.
Data Discovery and Dissemination with DIP
Authors: Kaisen Lin, Philip Levis
Venue: Proceedings of the 7th international conference on Information processing in sensor networks (2008)

We present DIP, a data discovery and dissemination protocol for wireless networks. Prior approaches, such as Trickle or SPIN, have overheads that scale linearly with the number of data items. For T items, DIP can identify new items with O(log(T)) packets while maintaining a O(1) detection latency. To achieve this performance in a wide spectrum of network configurations, DIP uses a hybrid approach of randomized scanning and tree-based directed searches. By dynamically selecting which of the two algorithms to use, DIP outperforms both in terms of transmissions and speed. Simulation and testbed experiments show that DIP sends 20-60% fewer packets than existing protocols and can be 200% faster, while only requiring O(log(log(T))) additional state per data item.