ppxscal/embedding_network huggingface dataset:
Website error analysis of colleges and universities on Long Island in New York
Authors: A. Ebrahimi, C. Schweikert, S. Sayeed, S. Parham, H. Akibu, A. Saeed, W. Parris
Venue: ACM SIGCSE Bulletin (2007)

Websites are an important means of communication for colleges and universities. Web-based presentations are replacing traditional ways of disseminating information. This study investigates the websites of 21 colleges and universities located on Long Island (Nassau, Suffolk) as well as five additional schools, four of which are Ivy League institutions. This research developed a technique of web site analysis known as 7X2 C's criteria, which are applied to seven separate layers of website application and development. The study concludes that the web sites of all the included institutions have errors across all the layers of the analysis to some degree that need to be corrected. Some of these errors are crucial, especially with regard to website search engines.
Some reflections on computer technology and higher education
Authors: Gordon R. Sherman
Venue: ACM SIGUCCS Newsletter (1976)

It is consistent with our times and the many troubled aspects of it that there is so much uncertainty over modern computer technology and its current and future effect on the general quality of human life. There is also, at least in the United States, much uncertainty concerning higher education and its future role in society's efforts to better things. The combination of these two major and important areas of activity, to my mind, makes a most vital subject for study and reflection by concerned persons.
Development of Collaboration Environments onWeb 1.0
Authors: Taro Yabuki, Hiroshi Sakuta
Venue: Proceedings of the Fifth International Conference on Creating, Connecting and Collaborating through Computing (2007)

In this study, a method to construct a collaboration environment is proposed and implemented. It has advantages such as (1) original web pages need not to be modified, and (2) the system requirement is adaptable, i.e. it is available on various operating systems and web browsers. Also, we will propose a way to utilize this method in e-Learning and how to enhance its efficiency.
Weighted least-squares blind deconvolution
Authors: S. Fiori
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 05 (1999)

This paper presents a new cost function for blind deconvolution of non-minimum phase systems. The proposed criterion arises as a natural consequence of a fundamental theorem proved by Benveniste, Goursat and Ruget (1980), and appears to be the weighted square of the difference among two spectra, thus its minimization leads to a weighted least-squares blind deconvolution technique. In order to assess the new theory some simulation results both on ideal (noiseless) and noisy channels are presented.
Automatic abstraction refinement for Petri nets verification
Authors: Zhenyu Chen, Conghua Zhou, Decheng Ding
Venue: Proceedings of the High-Level Design Validation and Test Workshop, 2005. on Tenth IEEE International (2005)

Model checking has emerged as a promising and powerful approach to analyze Petri nets automatically, but a main challenge is the state explosion problem. To obtain an efficient state space, we implement a series of formalisms based on Petri nets to achieve automatically predicate abstraction and refinement via new predicate discovery. However, the complicated predicates would slow down the abstraction refinement process. Novel Feature of our approach is minimizing the support of predicates, via diagnosing the failure reasons of transitions and projecting places on predicates to eliminate the dumb variables. In addition, a demonstrative example shows that our techniques could work efficiently on Petri nets.
Quantitative Analysis of Partition Statistics and their Impact on Data Replication in MANETs
Authors: Ke Shi, Zygmunt J. Haas
Venue: Proceedings of the Sixth International Symposium on Parallel and Distributed Computing (2007)

Data replication is, indeed, a widely used redundancy scheme for improving data accessibility in distributed systems at the cost of increased storage space and communication overhead. In this paper, we study the performance of data replication under mobile ad hoc networking environments in the presence of frequent network partitions by analytical modeling and by statistical analysis of simulation results. In particular, we examine the statistics of network partitions for a number of mobility models, and we propose distribution models to approximate the size of the network partitions. We then establish the relation between the network partitioning pattern and the effectiveness of the data replication scheme, which could be used to dynamically adjust the degree of replication depending on the current network operational conditions, while optimizing the trade-off between storage and data accessibility.
Modular communication subsystem implementation using a synchronous approach
Authors: Claude Castelluccia, Walid Dabbous
Venue: Proceedings of the High-Speed Networking Symposium on USENIX 1994 High-Speed Networking Symposium (1994)

The lack of flexibility and performance of current communication subsystems has led researchers to look for new protocol architectures. A new design philosophy, flexible and efficient, referred to in the literature as "function-based communication model" is emerging and seems to be very promising. It consists of designing application-tailored communication subsystems adapted to the specific requirements of a given application. The flexibility of such a solution leads to very efficient implementations integrating only required functionalities. In this paper, we propose a flexible model which uses a synchronous language to synthesize communication subsystems from functional building blocks. We prove the feasibility of our approach by implementing a data transfer protocol using Esterel, a synchronous language. Communication subsystem specifications in our model are very modular; they are composed of parallel modules, implementing the di erent functionalities of the communication subsystem, which synchronize and communicate using signals. The Esterel compiler generates from this parallel specification a sequential automaton by resolving resource conflicts. The design flexibility of our approach is demonstrated; modules are selected according the application requirements and compiled to generate an integrated implementation.
An evolutionary method for the design of generic neural networks
Authors: D. Edwards, K. Brown, N. Taylor
Venue: Proceedings of the Evolutionary Computation on 2002. CEC '02. Proceedings of the 2002 Congress - Volume 02 (2002)

Hybrid systems using evolution to optimize neural network design or training are usually limited in scope and effectiveness. A system is presented that permits the widest variety of networks to be evolved using a two-stage GA approach. Networks generated for a benchmark machine learning task compare favourably with alternative methods.
The DSP experiments for under graduate students
Authors: Y. Fuchiwaki
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 2000. on IEEE International Conference - Volume 06 (2000)

This paper describes digital signal processing (DSP) microprocessor experiments designed for university juniors majoring in electric and electronic (E&E) engineering. At the time of enrollment, most students have only studied the curriculum for analog signal processing which is taken in the prior semester. The proposed DSP microprocessor experiments are included along with analog signal processing. This early-on introduction to DSP technology allows students to realize that, in comparison with analog circuits, DSP microprocessors can process the same signals in real-time with broader flexibility. Such an understanding is considered important to instill strong incentive for students to become interested in the field of DSP.
Preserving salience by maintaining perceptual differences for image creation and manipulation
Authors: Jack Tumblin
Venue:  (2006)

Image creation is an attempt to record a scene for presentation to a viewer. However, there is a precarious mapping between how a scene would be perceived and how an image is perceived. For example, although the human visual system does not have a strong absolute sense of color or intensity, images are stored as a discrete set of color or intensity values at each pixel. The goal of this dissertation is to create perceptually salient images by more directly expressing perceived differences in scenes as displayed differences in images. This dissertation examines two methods of perceptual difference preservation for two long-standing problems: (1) a color to grayscale conversion algorithm that preserves all visible color changes through high-dimensional distance metrics; (2) hidden feature finding techniques that identify correspondences and mismatches between X-ray and visible light images of historically significant paintings through segmentation and local gradient statistics.
Network anomography
Authors: Yin Zhang, Zihui Ge, Albert Greenberg, Matthew Roughan
Venue: Proceedings of the 5th ACM SIGCOMM conference on Internet Measurement (2005)

Anomaly detection is a first and important step needed to respond to unexpected problems and to assure high performance and security in IP networks. We introduce a framework and a powerful class of algorithms for network anomography, the problem of inferring network-level anomalies from widely available data aggregates. The framework contains novel algorithms, as well as a recently published approach based on Principal Component Analysis (PCA). Moreover, owing to its clear separation of inference and anomaly detection, the framework opens the door to the creation of whole families of new algorithms. We introduce several such algorithms here, based on ARIMA modeling, the Fourier transform, Wavelets, and Principal Component Analysis. We introduce a new dynamic anomography algorithm, which effectively tracks routing and traffic change, so as to alert with high fidelity on intrinsic changes in network-level traffic, yet not on internal routing changes. An additional benefit of dynamic anomography is that it is robust to missing data, an important operational reality. To the best of our knowledge, this is the first anomography algorithm that can handle routing changes and missing data. To evaluate these algorithms, we used several months of traffic data collected from the Abilene network and from a large Tier-1 ISP network. To compare performance, we use the methodology put forward earlier for the Abilene data set. The findings are encouraging. Among the new algorithms introduced here, we see: high accuracy in detection (few false negatives and few false positives), and high robustness (little performance degradation in the presence of measurement noise, missing data and routing changes).
Automatic generation of Tcl bindings for C and C++ libraries
Authors: Wolfgang Heidrich, Philipp Slusallek
Venue: Proceedings of the 3rd Annual USENIX Workshop on Tcl/Tk - Volume 3 (1995)

In the past few years Tcl has found widespread interest as a extensible scripting language. Numerous Tcl interfaces for a variety of C libraries have been created. While most of these language bindings have been created by hand, others have made use of dedicated code generators designed for the specific library. In this paper we present a tool for the automatic generation of Tcl language bindings for arbitrary C libraries. Moreover, the mapping of C++ class hierarchies to [incr Tcl] classes will be described.
An inverse signal approach to computing the envelope of a real valued signal
Authors: R. Kumaresan
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 03 (1999)

We address the problem of estimating the envelope of a real valued signal, s(t), that is observed for a duration of T seconds. We model s(t) using a Fourier series, by considering periodic extensions of the signal. By using an analog of the autocorrelation method of linear prediction on the Fourier coefficients of s(t), the envelope of the signal is estimated without explicitly computing the analytic signal through Hilbert transformation. Using this method the envelope of a non-stationary signal can be computed by processing the signal through a sliding T-second window.
Path Selection for Communicating Tasks in a Wormhole-Routed Multicomputer
Authors: Sunggu Lee, Jong Kim
Venue: Proceedings of the 1994 International Conference on Parallel Processing - Volume 03 (1994)

In a multicomputer that uses wormhole routing or virtual cut-through circuit switching, the communication delay in sending a message between two processors along a path A increases significantly if the message is "blocked" by another message using one of the channels in path A. Such "blocking" can only occur if there is contention for a common channel by two or more paths. In this paper, we consider the problem of selecting contention-free or minimum-contention paths for a set of communicating tasks that have been mapped onto nodes in a multicomputer, This problem is formalized and shown to be an NPhard problem. thus, a heuristic solution is proposed for general static interconnection networks. Simulations results show that our method performs significantly better than alternative methods for this problem.
Teaching project development methodology to engineering technology students
Authors: L. P. Fabiano
Venue: Proceedings of the Frontiers in Education Conference, on 1995. Proceedings., 1995 - Volume 02 (1995)

Summary form only given. Today's competitive need to develop high quality products has redefined the development role of engineering technologists. Today, engineers and engineering technologists assume much broader responsibilities. Responsibility for achieving specific technical performance requirements is now coupled with achieving requirements for project management, concurrent engineering, interdisciplinary problem solving, and teamwork. In effect, a technologist assumes two development roles; project designer and project manager. The New Jersey Institute of Technology (NJIT) Engineering Technology (ET) department has implemented a senior project course which is responsive to the changing role of engineering technologists. Specifically, the senior project course for NJIT's Electrical Engineering Technology (EET) program emphasizes two aspects of project development: project design; and the development process associated with design and implementation. 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
The Design of Stateful Web Services Based on Web Service Resource Framework Implemented in Globus Toolkit 4
Authors: Laura Sebu, Horia Ciocarlie
Venue: Proceedings of the Eighth International Symposium on Symbolic and Numeric Algorithms for Scientific Computing (2006)

Web Services are the technology of choice for Internet-based applications with loosely coupled clients and servers. The state is kept in an entity called resource. Web Service Resource Framework is an open framework for modeling and accessing stateful resources using Web Services. The paper approaches the main issues that should be taken into consideration during the design process of stateful Web Services: using the factory design pattern for creating resources, registering resources in an index service, building a secure Web Service, accessing resource properties through the methods exposed in interfaces, lifetime management and notifications.
On the multichannel characteristics of a 1.8 GHz smart antenna system using a circular array in realistic non-stationary wireless scenarios
Authors: Weidong Yang
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 05 (1999)

In mobile communications, smart antenna systems that utilize an antenna array and perform advanced signal processing techniques can achieve greater channel capacity and improve link quality by selective reception/transmission at the base station. However, development of adaptive signal processing algorithms for smart antenna system applications require the accurate knowledge about the multichannel propagation characteristics. A few experimental results on the spatial signature variation of a uniform linear array (ULA) at 900 MHz have been reported. This paper presents the experimental results on the channel propagation characteristic variations of a 1.8 GHz smart antenna system using a uniform circular array (UCA) in moving mobile scenarios. The results indicate the stability of direction-of-arrival (DOAs) of multipath components in all scenarios, and the instability of the spatial signatures in scenarios with strong multipaths.
Access control to information in pervasive computing environments
Authors: Urs Hengartner, Peter Steenkiste
Venue: Proceedings of the 9th conference on Hot Topics in Operating Systems - Volume 9 (2003)

Many types of information available in a pervasive computing environment, such as people location information, should be accessible only by a limited set of people. Some properties of the information raise unique challenges for the design of an access control mechanism: Information can emanate from more than one source, it might change its nature or granularity before reaching its final receiver, and it can flow through nodes administrated by different entities. We propose three design principles for the architecture of an access control mechanism: (1) extract pieces of information in raw data streams early, (2) define policies controlling access at the information level, and (3) exploit information relationships for access control. We describe an example architecture in which we apply these principles. We also report how our earlier work about adding access control to a people location service contributed to the more general access control architecture proposed here.
An Authentication Model Involving Trusted Third Party for M-Commerce
Authors: Mingqiu Song, Xiangpei Hu, Jiahua Li, Guishi Deng
Venue: Proceedings of the International Conference on the Management of Mobile Business (2007)

In this paper, a new authentication model for MCommerce is proposed. The protocol has three novel characteristics as opposed to the existing protocols involving trusted third party in M-commerce. Firstly, it is minimal and can reduce the requirement of computational resources for mobile terminals. Secondly, it is manageable. The third party just provides security authentication, credit standing and session key for both the buyer and the seller, whereas it doesn't provide buyer's private payment information such as credit-card / debit-card information. In this way, it can avoid large scale of identity theft effectively. Thirdly, it can meet SSO of buyers. Its correctness is verified by using CSP/FDR. The checking result shows that this new protocol model satisfies the authentication and key distribution properties that it claimed.
A freshman electrical engineering course and laboratory for all engineering majors
Authors: J. Hatfield, D. Scott, D. Szmyd
Venue: Proceedings of the Frontiers in Education Conference, on 1995. Proceedings., 1995 - Volume 02 (1995)

Real and relevant are two adjectives that should apply to any engineering course, but the traditional first course in electrical engineering often appears to the students to provide little reality or relevance. This is particularly true for students in programs such as ours in which other engineering majors, including civil, mechanical, environmental, and computer science are in the course alongside electrical majors. At Northern Arizona University, we have addressed this issue by implementing major changes in the first course in the electrical engineering sequence. In this paper we describe the structure, content, equipment, computer tools, and teaching methods used in both the lecture and laboratory sections of the course.
Robust speech enhancement using amplitude spectral estimator
Authors: A. Wahab
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 2000. on IEEE International Conference - Volume 06 (2000)

This paper focuses on a class of speech enhancement systems using the amplitude spectral estimates of noisy speech and noise to drive a Wiener filter to suppress simultaneously the ensemble of degradations picked up by microphones. A simple stereo microphone set, with left and right channels can be used to provide enough separation that unwanted signals can be reduced significantly to yield an acceptable quality speech signal for hands-free telephony applications in a vehicular environment. A generalized transform approach was introduced and experimental results show great potential when using the DCT as alternatives to the traditional Fourier transform approach to derive the amplitude spectral estimates of the corrupted speech signals and the noise process.
Fast simulation of solid tumors thermal ablation treatments with a 3D reaction diffusion model
Authors: Daniele Bertaccini, Daniela Calvetti
Venue: Computers in Biology and Medicine (2007)

An efficient computational method for near real-time simulation of thermal ablation of tumors via radio frequencies is proposed. Model simulations of the temperature field in a 3D portion of tissue containing the tumoral mass for different patterns of source heating can be used to design the ablation procedure. The availability of a very efficient computational scheme makes it possible to update the predicted outcome of the procedure in real time. In the algorithms proposed here a discretization in space of the governing equations is followed by an adaptive time integration based on implicit multistep formulas. A modification of the ode15s MATLAB function which uses Krylov space iterative methods for the solution of the linear systems arising at each integration step makes it possible to perform the simulations on standard desktop for much finer grids than using the built-in ode15s. The proposed algorithm can be applied to a wide class of nonlinear parabolic differential equations.
Robust mixture modeling using the skew t distribution
Authors: Tsung I. Lin, Jack C. Lee, Wan J. Hsieh
Venue: Statistics and Computing (2007)

A finite mixture model using the Student's t distribution has been recognized as a robust extension of normal mixtures. Recently, a mixture of skew normal distributions has been found to be effective in the treatment of heterogeneous data involving asymmetric behaviors across subclasses. In this article, we propose a robust mixture framework based on the skew t distribution to efficiently deal with heavy-tailedness, extra skewness and multimodality in a wide range of settings. Statistical mixture modeling based on normal, Student's t and skew normal distributions can be viewed as special cases of the skew t mixture model. We present analytically simple EM-type algorithms for iteratively computing maximum likelihood estimates. The proposed methodology is illustrated by analyzing a real data example.