ppxscal/embedding_network huggingface dataset:
Data aggregation and routing in Wireless Sensor Networks: Optimal and heuristic algorithms
Authors: Jamal N. Al-Karaki, Raza Ul-Mustafa, Ahmed E. Kamal
Venue: Computer Networks: The International Journal of Computer and Telecommunications Networking (2009)

A fundamental challenge in the design of Wireless Sensor Networks (WSNs) is to maximize their lifetimes especially when they have a limited and non-replenishable energy supply. To extend the network lifetime, power management and energy-efficient communication techniques at all layers become necessary. In this paper, we present solutions for the data gathering and routing problem with in-network aggregation in WSNs. Our objective is to maximize the network lifetime by utilizing data aggregation and in-network processing techniques. We particularly focus on the joint problem of optimal data routing with data aggregation en route such that the above mentioned objective is achieved. We present Grid-based Routing and Aggregator Selection Scheme (GRASS), a scheme for WSNs that can achieve low energy dissipation and low latency without sacrificing quality. GRASS embodies optimal (exact) as well as heuristic approaches to find the minimum number of aggregation points while routing data to the Base-Station (BS) such that the network lifetime is maximized. Our results show that, when compared to other schemes, GRASS improves system lifetime with acceptable levels of latency in data aggregation and without sacrificing data quality.
New Adaptive Algorithm for Unbiased and Direct Estimation of Sinusoidal Frequency
Authors: Thomas Pitschel, Hing-Cheung So, Jun Zheng
Venue: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (2008)

A new adaptive filter algorithm based on the linear prediction property of sinusoidal signals is proposed for unbiased estimation of the frequency of a real tone in white noise. Similar to the least mean square algorithm, the estimator is computationally simple and it provides unbiased as well as direct frequency measurements. Learning behavior and variance of the estimated frequency are derived and confirmed by computer simulations.
Real-time fluid simulation using discrete sine/cosine transforms
Authors: Benjamin Long, Erik Reinhard
Venue: Proceedings of the 2009 symposium on Interactive 3D graphics and games (2009)

Recent advances in fluid simulations have yielded exceptionally realistic imagery. However, most algorithms have computational requirements that are prohibitive for real-time simulations. Using Fourier based solutions mitigates this issue, although due to wraparound, boundary conditions are not naturally available, leading to inconsistencies near the boundary. We show that slip boundary conditions can be imposed by solving the mass conservation step using cosine and sine transforms instead of the Fourier transform. Further, we show that measures against density dissipation can be computed using cosine transforms and we describe a new method to compute surface tension in the same domain. This combination of related algorithms leads to real-time simulations with boundary conditions.
Micro-estimation Based Global Collaborative Task Arrangement in Distributed Software Design
Authors: Hua Hu, Bin Xu, Yun Ling, Xiaohu Yang, Zhijun He, Albert Ma
Venue: Computer Supported Cooperative Work in Design IV: 11th International Conference, CSCWD 2007, Melbourne, Australia, April 26-28, 2007. Revised Selected Papers (2008)

Efficient Task arrangement is difficult in global collaboration especially for distributed software design. Since the software design is a kind of creative work and there are reworks almost all the time, the duration and even the task sequence is undetermined. On the basis of Micro-estimation method, here we present our solution to reschedule the global collaborative design tasks to shorten the software development cycle. The traditional schedule methods are also analyzed in global collaborative environment. The software engineers may enhance their collaboration in global software design with the suggested solution.
Color reduction for complex document images
Authors: Nikos Nikolaou, Nikos Papamarkos
Venue: International Journal of Imaging Systems and Technology (2009)

A new technique for color reduction of complex document images is presented in this article. It reduces significantly the number of colors of the document image (less than 15 colors in most of the cases) so as to have solid characters and uniform local backgrounds. Therefore, this technique can be used as a preprocessing step by text information extraction applications. Specifically, using the edge map of the document image, a representative set of samples is chosen that constructs a 3D color histogram. Based on these samples in the 3D color space, a relatively large number of colors (usually no more than 100 colors) are obtained by using a simple clustering procedure. The final colors are obtained by applying a mean-shift based procedure. Also, an edge preserving smoothing filter is used as a preprocessing stage that enhances significantly the quality of the initial image. Experimental results prove the method's capability of producing correctly segmented complex color documents where the character elements can be easily extracted as connected components. &copy; 2009 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 19, 14&ndash;26, 2009
Enhanced Link-Status Detection for High Speed Link Aggregation in Cognitive Radio Networks
Authors: Stefan Aust, Peter Davis, Akira Yamaguchi, Sadao Obana
Venue: IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences (2008)

The aggregation of Wi-Fi links has been identified as one way of taking advantage of available channels to achieve higher speed data transmission in future cognitive radio networks. However variations in link quality make it difficult to achieve stable performance from aggregated Wi-Fi links. In this paper we present a method for controlling aggregation of Wi-Fi links based on monitoring of link status. We first discuss the requirements for detecting bad-links which degrade the performance of aggregated Wi-Fi links. We then describe the implementation of an enhanced link-status detection algorithm based on monitoring of signal strength and number of retransmissions. In particular, we address the problems of monitoring and recovering links after they have been dropped from use, and adjusting decision thresholds to adapt to changing wireless conditions. Finally, we report the results of tests which demonstrate the effectiveness for attaining efficient aggregation of Wi-Fi links for high throughput under varying wireless conditions.
Regular variation and related results for the multivariate GARCH(p,q) model with constant conditional correlations
Authors: Begoña Fernández, Nelson Muriel
Venue: Journal of Multivariate Analysis (2009)

We establish the regular variation of the finite dimensional distributions of the multivariate GARCH(p,q) process with constant conditional correlations under mild assumptions on the noise distribution. We use this property for two main purposes: First, to describe the componentwise-maximum domain of attraction in which the process lies; and second, to relate the asymptotic behavior of the sample autocovariance function of the process to its regular variation index.
The RadioBSD Crier: 2007/01 Managing FreeBSD and NetBSD Firewalls
Authors: Jacek Artymiak
Venue:  (2007)

The RadioBSD Crier: 2007/01 brings you a 24-page article on managing FreeBSD and NetBSD IPFW, IPFW2, and IP6FW firewalls. This is a RadioBSD book. Join our community at http://www.radiobsd.com.
Musink: composing music through augmented drawing
Authors: Theophanis Tsandilas, Catherine Letondal, Wendy E. Mackay
Venue: Proceedings of the 27th international conference on Human factors in computing systems (2009)

We focus on the creative use of paper in the music composition process, particularly the interaction between paper and end-user programming. When expressing musical ideas, composers draw in a precise way, not just sketch. Working in close collaboration with composers, we designed Musink to provide them with a smooth transition between paper drawings and OpenMusic, a flexible music composition tool. Musink's built-in recognizers handle common needs, such as scoping and annotation. Users can also define new gestures and associate them with their own or predefined software functions. Musink supports semi-structured, delayed interpretation and serves as a customizable gesture browser, giving composers significant freedom to create their own, individualized composition languages and to experiment with music, on-paper and on-line.
A Data Collection Protocol for Local Mobile Sensor Network
Authors: Bin Zeng, Jun Wei, HaiQing Liu
Venue: Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 01 (2009)

In future pervasive computing environments, applications should be able to automatically adapt to their changing context such as environment status and system conditions. Therefore, context information collection is an ignored yet significant research area. An efficient sensor data collection protocol is studied in this paper for a sensor header (collector) to continuously collect data from mobile nodes in its local access area, where the mobile node refers to a relatively tiny sensor often fixed on a mobile object without high precision antenna to sense carriers emitted by other nodes. The protocol consists of registration phase when one-to-many access model is used to identify the local nodes and data collection phase when the efficient one-to-one access model can be incorporated based on the result of first phase. Furthermore, the critical performance parameters are derived to analyze and control the runtime execution of the protocol. Simulation results show that the protocol performance improves in a wide mobility range by appropriately controlling the system parameters.
Issues in Design and Implementation of Multimedia Software Systems
Authors: A. Bianchi, P. Mussio, P. Bottoni
Venue: Proceedings of the IEEE International Conference on Multimedia Computing and Systems - Volume 2 (1999)

This paper describes a user-centered approach to Multimedia Software System aimed at satisfying requirements of end-user computing. MSS design and development explicitly accounts for their capabilities of capturing and producing textual, pictorial, sound and haptic events and for the requirements of empowering users in the execution of their tasks and preventing them from getting lost in the multimedia virtual space and from the consequences of their incorrect operations.
People teaching people: a cooperative education venture
Authors: Edwin F. Kerr
Venue: Proceedings of the May 4-7, 1981, national computer conference (1981)

Personnel problems faced by DP executives will continue to be a major obstacle in developing systems for the 1980's. Both corporate and DP management are now viewing personnel development expenditures as an investment rather than an expense. This paper stresses the need for a career development program and a well planned education and training activity. It discusses the difficulty of providing the training, particularly classroom instructor-led courses. It next discusses a cooperative EDP Education Program (EDPEP) covering the concept, the establishing of a network of regional learning centers and the impact it has made. The program provides regularly scheduled classes to member companies at under $100/day. Since its inception in 1974, it has grown to 75 member companies. In 1980 over 3,600 students attended the courses.
MTV Our Noise
Authors: Fabio Berton
Venue: ACM SIGGRAPH ASIA 2008 computer animation festival (2008)

The ideas behind this short animation were to play with the music sync through the movements of the birds and use texture to give a look to the birds that is reminiscent of the 1980s band Kiss.
Single polarization guidance in liquid-crystal photonic bandgap fibers
Authors: J. Sun, C. C. Chan, Y. F. Zhang
Venue: Proceedings of the 2008 International Conference on Advanced Infocomm Technology (2008)

Bandgap formation in nematic liquid crystal photonic bandgap fiber made of high-index nonsilica glass has been investigated. Scalar wave approximation indicates the possibility of constructing the full bandgap structure through two isotropic simulations for the two polarization components. Furthermore, analogous to an isotropic photonic bandgap fiber, refractive index scaling laws are also valid. The anisotropic property of nematic liquid crystal opens up several practically interesting guiding regimes, which enable the construction of novel polarization controllers or switching devices.
Applying Multi-Swarm Accelerating Particle Swarm Optimization to Dynamic Continuous Functions
Authors: Yi Jiang, Wei Huang, Li Chen
Venue: Proceedings of the 2009 Second International Workshop on Knowledge Discovery and Data Mining (2009)

In this paper, the Particle Swarm Optimizer is modified to create the Multi-Swarm Accelerating PSO which is applied to dynamic continuous functions. Different from the existing multi-swarm PSOs and local versions of PSO, the swarms are dynamic and the swarms' size is small. The whole population is divided into many small swarms, these swarms are regrouped frequently by using various regrouping schedules and information is exchanged among the swarms. Accelerating operators is combined to improve its local search ability. The MSA-PSO recognizes changes in the search space and adjusts to these changes in the environment. The effectiveness of the modification is demonstrated by application to some dynamic continuous functions.
Managing Collaboration Using Agent Based Simulation
Authors: Utomo Sarjono Putro, Manahan Siallagan, Santi Novani, Dhanan Sarwo Utomo
Venue: Proceedings of the 11th Pacific Rim International Conference on Multi-Agents: Intelligent Agents and Multi-Agent Systems (2008)

The purpose of the present research is to identify, analyze and simulate dynamics of interaction and conflicts among agents using drama theory, and to apply it in Citarum river basin problem. To accomplish the purpose, we first model the process in terms of drama theory that is combined with emotional state model (PAD). One of the reasons why we adopt drama theory is that it primarily focuses on dilemma or paradox arising from rational goal seeking behavior. It also provides us with rigorous analytical and computational tools of conflict analysis.Then, we propose a simulation model to describe both of dilemma of conflict, i.e., persuasion and rejection dilemma among the agents, and the dilemma of collaboration (trust dilemma) among the agents. Finally, we conduct agent-based simulation by using SOARS (Spot Oriented Agent Role Simulator) to obtain some fruitful suggestions for encouraging their collaboration.
Haptic Teleoperated Robotic System for an Effective Obstacle Avoidance
Authors: Nadia Garcia-Hernandez, Vicente Parra-Vega
Venue: Proceedings of the 2009 Second International Conferences on Advances in Computer-Human Interactions (2009)

A novel haptic teleoperated scheme for an efficient obstacle avoidance under human guidance is introduced. A remote robot immersed in an environment with obstacles is guided by a user using the end-effector of a haptic device. The system provides force feedback to the user when he approaches a potential field surrounding an obstacle. The user assigns the potential fields to the obstacles based on subjective judgments, i.e. a loose fitting potential field whether the obstacle is fragile or tough, to avoid a close approach to it. Obstacle avoidance experiments under visual and force feedback were performance and the results confirm the effectiveness of this scheme.
Technical Section: Sketch-based modeling: A survey
Authors: Luke Olsen, Faramarz F. Samavati, Mario Costa Sousa, Joaquim A. Jorge
Venue: Computers and Graphics (2009)

User interfaces in modeling have traditionally followed the WIMP (Window, Icon, Menu, Pointer) paradigm. Though functional and very powerful, they can also be cumbersome and daunting to a novice user, and creating a complex model requires considerable expertise and effort. A recent trend is toward more accessible and natural interfaces, which has lead to sketch-based interfaces for modeling (SBIM). The goal is to allow sketches-hasty freehand drawings-to be used in the modeling process, from rough model creation through to fine detail construction. Mapping a 2D sketch to a 3D modeling operation is a difficult task, rife with ambiguity. To wit, we present a categorization based on how a SBIM application chooses to interpret a sketch, of which there are three primary methods: to create a 3D model, to add details to an existing model, or to deform and manipulate a model. Additionally, in this paper we introduce a survey of sketch-based interfaces focused on 3D geometric modeling applications. The canonical and recent works are presented and classified, including techniques for sketch acquisition, filtering, and interpretation. The survey also provides an overview of some specific applications of SBIM and a discussion of important challenges and open problems for researchers to tackle in the coming years.
A Verification Development Platform for UHF RFID Reader
Authors: Chen Ying
Venue: Proceedings of the 2009 WRI International Conference on Communications and Mobile Computing - Volume 01 (2009)

This paper introduces a verification development platform for RFID reader. The RFID reader is compatible with EPC Class-1, Generation-2 Standard, operating at the 915MHz band. The UHF RFID reader includes RF analog front end (AFE), the base band and clock. The RFID RF AFE contains transmitting circuit receiving circuit frequency synthesize, circulator, etc. The base band contains the FPGA chip, DDR SDRAM, FLASH, A/D, D/A, etc. the FPGA chip is inserted NiosII soft core. This architecture is an advantage for implementing various kinds of RFID standards, and efficiently reduces the design and development time and cost. The platform achieves rapid, flexible and efficient verification and development by changing the soft of NiosII core in FPGA.
Games on Strings with a Limited Order Relation
Authors: Elisabetta Maria, Angelo Montanari, Nicola Vitacolonna
Venue: Proceedings of the 2009 International Symposium on Logical Foundations of Computer Science (2009)

In this paper, we show how Ehrenfeucht-Fraïssé games can be successfully exploited to compare (finite) strings. More precisely, we give necessary and sufficient conditions for Spoiler/Duplicator to win games played on finite structures with a limited order relation, that lies in between the successor relation and the usual (linear) order relation, and a finite number of unary predicates. On the basis of such conditions, we outline a polynomial (in the size of the input strings) algorithm to compute the "remoteness" of a game and to determine the optimal strategies/moves for both players.
Performance Analysis of a Software Retrieval Service
Authors: Leïla Kloul
Venue: Electronic Notes in Theoretical Computer Science (ENTCS) (2009)

The work we present in this paper is based on an approach we have developed to model mobility and performance information at the design level. This approach consists in translating a UML2.0 model onto a process algebra, namely PEPA nets, model. Once the process algebra model generated, performance analysis of the modelled system can be carried out. In this paper, we show how to use this approach to investigate the performance of a software retrieval service.
Vision-Based Semi-supervised Homecare with Spatial Constraint
Authors: Tianqiang Liu, Hongxun Yao, Rongrong Ji, Yan Liu, Xianming Liu, Xiaoshuai Sun, Pengfei Xu, Zhen Zhang
Venue: Proceedings of the 9th Pacific Rim Conference on Multimedia: Advances in Multimedia Information Processing (2008)

Vision-based homecare system receives increasing research interest owing to its efficiency, portability and low-cost characters. This paper presents a vision-based semi-supervised homecare system to automatically monitor the exceptional behaviors of self-helpless persons in home environment. Firstly, our proposed framework tracks the behavior of surveilled individual using dynamic conditional random field tracker fusion, based on which we extract motion descriptor by Fourier curve fitting to model behavior routines for exception detection. Secondly, we propose a Spatial Field constraint strategy to assist SVM-based exception action decision with a Bayesian inference model. Finally, a novel semi-supervised learning mechanism is also presented to overcome the exhaustive labeling behavior in previous works. Experiments over home environment video dataset with five normal and two exceptional behavior categories shows the advantage of our proposed system comparing with previous works.
Robust tracking of weak GPS signals in multipath and jamming environments
Authors: M. Sahmoudi, Moeness G. Amin
Venue: Signal Processing (2009)

In this paper, we address the problem global positioning system (GPS) signals tracking in low signal-to-noise ratio (SNR) and multipath plus interference environments using a two-step approach: a block-averaging pre-processing (BAP) which converts the zero-mean interferences to colored Gaussian noise and a maximum likelihood (ML) based algorithm combined with a whitening transform. We apply the recently proposed BAP technique to improve the SNR. For code tracking with multipath mitigation, we exploit the fact that during a period with no data bit edges, the propagation delay causes only a circular shift to the C/A code block. This allows the decomposition of the averaged data vector into a constant C/A code component plus an undesired signal component. An efficient temporal whitening transform is derived from the sample covariance matrix and applied to suppress strong colored interferers, rendering the ML estimation problem of the multipath parameters tractable. A computationally efficient procedure for solving the complex ML optimization problem is considered using a finite difference maximization technique. By estimating the multipath signals and subtracting their contributions in a sequential scheme, the code synchronization is achieved. The resulting robust ML (RML) tracking procedure is more efficient in mitigating multipath and non-Gaussian interferences. The performance of the developed RML receiver is evaluated through computer simulations to show its superiority over that of narrow correlator and MEDLL approach.
Automating warm-up length estimation
Authors: Kathryn Hoad, Stewart Robinson, Ruth Davies
Venue: Proceedings of the 40th Conference on Winter Simulation (2008)

There are two key issues in assuring the accuracy of estimates of performance obtained from a simulation model. The first is the removal of any initialisation bias, the second is ensuring that enough output data is produced to obtain an accurate estimate of performance. This paper is concerned with the first issue, and more specifically warm-up estimation. A continuing research project is described that aims to produce an automated procedure, for inclusion into commercial simulation software, for estimating the length of warm-up and hence removing initialisation bias from simulation output data.