ppxscal/embedding_network huggingface dataset:
Delta Hedging Energy Portfolios: an Exploratory Study
Authors: Richard Goldberg, James Read, Art Altman, Remi Audouin
Venue: Proceedings of the 40th Annual Hawaii International Conference on System Sciences (2007)

Delta hedging, although widely used in commodity markets, needs to be further adapted to electricity markets. Given the extreme volatility of electricity prices, even a portfolio whose market value is perfectly hedged may still yield large and potentially unacceptable cash-flow swings in the short term. Thus, hedging strategies may need to meet multiple, if not conflicting, objectives: one is to secure the market value of a portfolio, and another is to avoid large cash-flow variations in a given time period. This paper analyses both objectives, explores several hedging strategies tailored to each, and compares their relative efficiency.
A test of MPEG using time-inverted spoken audio
Authors: T. McLaughlin
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 02 (1996)

We excerpted a 20 second sample from a DAT-mastered talking book segment and encoded it at 32 and 48 kbit/sec using MPEG I, layer 3. We also encoded the same segment at 80 kbit/sec. using MPEG I, layer 2. We then encoded a time-inverted version of the material in the same way. After decoding, we put the inverted segments back into normal sequence and compared them with the corresponding segments encoded in normal temporal order. We did the comparison by means of an ABX test with volunteer listeners. Naive listeners were unable to reliably distinguish between material coded in normal temporal order and the same material coded in inverted order. Trained listeners could reliably make the distinction in layer 3 at 32 and 48 kbit/sec. but not in layer 2 at 80 kbit/sec.
Techniques to incorporate the benefits of a hierarchy in a modified hidden Markov model
Authors: Lin-Yi Chou
Venue: Proceedings of the COLING/ACL on Main conference poster sessions (2006)

This paper explores techniques to take advantage of the fundamental difference in structure between hidden Markov models (HMM) and hierarchical hidden Markov models (HHMM). The HHMM structure allows repeated parts of the model to be merged together. A merged model takes advantage of the recurring patterns within the hierarchy, and the clusters that exist in some sequences of observations, in order to increase the extraction accuracy. This paper also presents a new technique for reconstructing grammar rules automatically. This work builds on the idea of combining a phrase extraction method with HHMM to expose patterns within English text. The reconstruction is then used to simplify the complex structure of an HHMM The models discussed here are evaluated by applying them to natural language tasks based on CoNLL-2004 and a sub-corpus of the Lancaster Treebank
Can user-centered interface design be applied to education?
Authors: V. Javier Traver
Venue: ACM SIGCSE Bulletin (2007)

The principles behind the discipline of Human-Computer Interaction (HCI) may have applications well beyond the design of artifacts or their interfaces. We argue that the philosophy (and practice) of user-centered design (UCD) can (and should) pervade most human activities. Indeed, not only human-computer (and computer-mediated human communication) but also human-human communication may benefit from this perspective. In this paper we are particularly concerned with the application of UCD to the educational setting. The novel view in this work is that formal teaching and learning (of anything, at any level), might be improved if instructional design, in analogy to the usual interface design, is student-centered. The brief, but illustrative, experience of the author in an HCI course for university computer-science students is at the core motivation of this reflective work.
Information Exchange in Mobile Encounter Network
Authors: Vesa A. Korhonen, Jani Kurhinen
Venue: Proceedings of the Third International Conference on Networking and Services (2007)

In this paper we analyze an information exchange method based on information diffusion in Mobile Encounter Networks, a form of mobile peer-to-peer networks. We utilize Dual Mobility Model which provides support for more realistic simulations compared to mobility models based only one method of movement. The distribution of the mobile device encounter intervals are discussed and analyzed via simulation runs. The logistic model is suggested to provide reasonably accurate estimates of the information diffusion process.
Stability bounds on step-size for the partial update LMS algorithm
Authors: M. Godavarti
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 03 (1999)

Partial updating of LMS filter coefficients is an effective method for reducing the computational load and the power consumption in adaptive filter implementations. Only in the recent past has any work been done on deriving conditions for filter stability, convergence rate, and steady state error for the partial update LMS algorithm. Douglas (see IEEE Trans. Circuits and Systems-II: Analog and Digital Signal Processing, vol.44, p.209-16, 1997) derived approximate bounds on the step-size parameter /spl mu/ which ensure stability in-the-mean of the alternating even/odd index coefficient updating strategy. Unfortunately, due to the restrictiveness of the assumptions, these bounds are unreliable when fast convergence (large /spl mu/) is desired. In this paper, tighter bounds on /spl mu/ are derived which guarantee convergence in the mean of the coefficient sequence for the case of wide sense stationary signals. 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
Disclosive computer ethics?
Authors: John G. Messerly
Venue: ACM SIGCAS Computers and Society (2007)

In his article "Disclosive Computer Ethics," Phillip Brey critiques mainstream computer ethics (MCE) and argues for a disclosive computer ethic (DCE) "which is concerned with the moral deciphering of embedded values and norms in computer systems, applications, and practices."1 In this article I argue that DCE simply shifts the focus of MCE toward issues Brey deems important.
Evaluating a motivational freshman course
Authors: B. Carlson, P. Schoch, M. Kalsher, B. Racicot
Venue: Proceedings of the Frontiers in Education Conference on 1995. Proceedings., 1995 vol 1. - Volume 01 (1995)

Rensselaer Polytechnic Institute has developed an elective laboratory course intended to motivate freshmen for further study of engineering in general and to spur interest in electrical and computer engineering in particular. The course philosophy is that hands-on laboratory and design experiences will build strident confidence, stimulate curiosity, and demonstrate the relevance of engineering work. These, in turn, should increase motivation and retention. To assess the impact of this course, a multi-dimensional evaluation process has been conducted consisting of: attitudinal surveys of the students at the end of the course; structured interviews with students in the course; surveys of the students in a subsequent design course; and pretests and posttests of student creativity. Evaluation results indicate that carefully structured hands-on experience is an effective way of motivating freshmen for further engineering study. The results also indicate that the course has increased student creativity and confidence in their abilities. Furthermore, the improvements in motivation and confidence can still be measured in subsequent semesters. Thus, since the new course is just a one-credit laboratory, it appears possible to address the problem of motivating engineering freshmen with only a modest impact on already crowded first-year programs.
WET: a prototype of an Exploratory Search System for Web Mining to assess Usability
Authors: Victor Pascual, Juan Carlos Dursteler
Venue: Proceedings of the 11th International Conference Information Visualization (2007)

Analysing the evolution of a site and the behaviour of its users has become a crucial work in order to let the webmasters and the owners of web sites to enhance their site in terms of structure and contents. Data mining techniques provide many metrics and statistics useful to understand the structure of a website, and the use its users make of it, but they are still not easy to interpret and to understand. Most of these metrics can also be combined, in order to discover new trends and patterns. We present a preliminary prototype of an exploratory search system for web mining which main goal is to provide a set of tools and visual representations that allow the user to explore and to decide how to represent the available data. This approach defines a system that will help us to evaluate the usability of the implemented interactions and visual metaphors.
A framework for element-based computer graphics
Authors: Katherine Merle Mason
Venue:  (2006)

There is an imbalance between personal and algorithmic control in existing techniques for element-based computer graphics. A refraining of the traditional graphics pipeline is used to address this. By turning modelling and rendering into an interactive process, and introducing semi-autonomous agents to manage elements, we develop a framework through which it is possible to build applications with a given control balance. Agents negotiate control of their representations on a canvas via interactions in agent space. Interaction with the rendered image on canvas is conveyed to agents responsible for that image, which interpret the interaction and adjust the underlying model appropriately. In addition, the concept of a coalition, as in game theory, provides a means for groups of agents to organise or be organised. This framework is realised as a prototype engine along with a series of examples that illustrate a broad range of variations in control balance that are possible within this framework.
Benchmarking XML Based Application Oriented Network Infrastructure and Services
Authors: Abdul Waheed, Jianxun Jason Ding
Venue: Proceedings of the 2007 International Symposium on Applications and the Internet (2007)

Common application infrastructure services are shifting from back-end hosts to the network edges. Cisco Systems Application Oriented Networking (AON) initiative is an example of this emerging trend. Benchmarking such infrastructure and services is expected to play an important role in the networking industry. We present AONBench specifications and methodology to benchmark networked XML application servers and appliances. AONBench is not a benchmarking tool. It is a specification and methodology for performance measurements, which leverages from existing XML microbenchmarks and uses HTTP for end-to-end communication. We implement AONBench specifications for end-to-end performance measurements through public domain HTTP load generation tool ApacheBench and Apache web server. We present three case studies of using AONBench for architecting real application oriented networking products.
Object rotation axis from shading
Authors: J. Stauder
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 06 (1999)

In this paper, a non-complex estimator is developed for the tilt angle of the rotation axis of an object that is illuminated by a point light source. The tilt angle defines the orientation of the 2D projection of the 3D object rotation axis in the image plane and is a strong clue for image understanding. The estimator evaluates two images of a video image sequence showing a moving object. Additionally, only a displacement vector field and the 2D object silhouette are required. No 3D information is required. Therefore, the object is assumed to be rigid, to be matte, to have equally distributed surface normals and to be illuminated by a distant point light source and ambient light. For estimation, the displaced frame ratio (DFR), i.e. the frame ratio after motion compensation, is evaluated statistically. The DFR depends only on the photometric effect of temporally changing object shading. Experimental results with real images show the proper performance of the derived estimator for real objects. 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
Integration of association rules and ontologies for semantic query expansion
Authors: Min Song, Il-Yeol Song, Xiaohua Hu, Robert B. Allen
Venue: Data Knowledge Engineering (2007)

We propose a novel semantic query expansion technique that combines association rules with ontologies and Natural Language Processing techniques. Our technique is different from others in that (1) it utilizes the explicit semantics as well as other linguistic properties of unstructured text corpus, (2) it makes use of contextual properties of important terms discovered by association rules, and (3) ontology entries are added to the query by disambiguating word senses. Using TREC ad hoc queries we achieve from 13.41% to 32.39% improvement for P@20 and from 8.39% to 14.22% for the F-measure.
Time-frequency analysis of seismic reflection signals
Authors: P. Steeghs
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 05 (1996)

We show the implementation of bilinear time-frequency representations in the interpretation of seismic data. In seismic stratigraphy the reflection patterns in seismic data are interpreted in terms of subsurface stratification and lithological properties. The time-frequency representation clearly elicits seismic reflection patterns and can thus provide useful information on subsurface stratification. A comparison of several t-f representations shows that the best results, from an interpretational point of view, can be obtained with a kernel that is adapted to the characteristics of the signal to be analyzed. We demonstrate that considerable improvement upon an existing method for seismic data analysis, complex-trace attribute analysis, can be achieved. The local frequency that is extracted from the t-f representation provides a better picture of the spectral variation in the data than the instantaneous frequency, that was derived from the analytic signal.
A lossless multi-partitioning successive zero coder for wavelet-based progressive image transmission
Authors: Chun-Ho Cheung
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 06 (1999)

This paper proposed an embedded image compression algorithm called lossless multi-partitioning successive zero coder (LMP-SZC) using the integer wavelet transform for progressive image transmission (PIT). By dynamically adjusting the partitions based on the space-frequency domain coefficients, our algorithm can achieve lower complexity and superior coding efficiency as compared with other well-known embedded lossless wavelet-based coder even without the zerotree analysis.
Towards Assessing Modularity
Authors: Hayden Melton, Ewan Tempero
Venue: Proceedings of the 29th International Conference on Software Engineering Workshops (2007)

It's noted in this workshop's call for papers that despite the emergence of a large number of "modularisation techniques" (e.g., aspects, design patterns, and so on), there are no standard approaches or "rules of thumb" for assessing the benefits and drawbacks of using these techniques in the construction of real software systems. In this paper we argue that the first step in assessing such techniques should be to determine their effect on modularity. Only then can we be sure that they have even been correctly classified as "modularisation techniques".
IP fault localization via risk modeling
Authors: Ramana Rao Kompella, Jennifer Yates, Albert Greenberg, Alex C. Snoeren
Venue: Proceedings of the 2nd conference on Symposium on Networked Systems Design & Implementation - Volume 2 (2005)

Automated, rapid, and effective fault management is a central goal of large operational IP networks. Today's networks suffer from a wide and volatile set of failure modes, where the underlying fault proves difficult to detect and localize, thereby delaying repair. One of the main challenges stems from operational reality: IP routing and the underlying optical fiber plant are typically described by disparate data models and housed in distinct network management systems. We introduce a fault-localization methodology based on the use of risk models and an associated troubleshooting system, SCORE (Spatial Correlation Engine), which automatically identifies likely root causes across layers. In particular, we apply SCORE to the problem of localizing link failures in IP and optical networks. In experiments conducted on a tier-1 ISP backbone, SCORE proved remarkably effective at localizing optical link failures using only IP-layer event logs. Moreover, SCORE was often able to automatically uncover inconsistencies in the databases that maintain the critical associations between the IP and optical networks.
OWL-Based Context-Dependent Task Modeling and Deducing
Authors: Hongbo Ni, Xingshe Zhou, Zhiwen Yu, Kejian Miao
Venue: Proceedings of the 21st International Conference on Advanced Information Networking and Applications Workshops - Volume 02 (2007)

In the near future, homes are envisioned to be equipped with numerous intelligent communicating devices. Such smart home needs to exhibit highly adaptive behavior to meet the inhabitants changing personal requirements and operational context of environment. To achieve this, smart home application should focus on the inhabitant's goal or task in diverse situation, but not the various complex devices and services. This paper proposes a context-dependent task approach to meet the challenge. The most important component is task model which provides an adequate high-level description of user-oriented tasks and their related contexts, and in such model multiple entities can easily exchange, share and reuse their knowledge. An OWL-based ontology to hierarchically model context-dependent task is presented, which facilitates sharing and reusing of smart space knowledge and logic inferences. The conversion of OWL task ontology specifications to the First-Order Logic (FOL) representations is described. Finally, the performance of FOL rule based deducing in terms of task number, context size and time is evaluated.
Objectively measured descriptors applied to speaker characterization
Authors: B. F. Necioglu, M. A. Clements
Venue: Proceedings of the Acoustics, Speech, and Signal Processing, 1996. on Conference Proceedings., 1996 IEEE International Conference - Volume 01 (1996)

Automatic speaker identification and verification systems can achieve impressive performance levels but the determination of what physical features of the speech waveform contribute to the perceptual characterization of speakers remains a topic of research interest. We present and investigate a variety of features objectively extracted from the speech waveform to characterize perceptual speaker differences. The features belong to three broad classes of glottal, vocal tract and prosodic measurements. They are first evaluated in the context of a speaker distinguishability task by two measures: (i) an invariant criterion of cluster scattering, and, (ii) the error rate achieved by a maximum likelihood same-or-different-speaker classification. Principal components analysis indicates an underlying dimensionality of 6 out of the 20 objective descriptors.
Using Domain Partitioning in Wrapper Design for IP Cores Under Power Constraints
Authors: Thomas Edison Yu, Tomokazu Yoneda, Danella Zhao, Hideo Fujiwara
Venue: Proceedings of the 25th IEEE VLSI Test Symmposium (2007)

This paper presents a novel design method for power-aware test wrappers targeting embedded cores with multiple clock domains. We show that effective partitioning of clock domains combined with bandwidth conversion and gated-clocks would yield shorter test times due to greater flexibility when determining optimal test schedules especially under tight power constraints.
The Influence of Online Brand Community Characteristics on Community Commitment and Brand Loyalty
Authors: H. Y. Jang, I. S. Ko, J. Koh
Venue: Proceedings of the 40th Annual Hawaii International Conference on System Sciences (2007)

Online community activities are becoming widespread thanks to the expansion of Internet use and the development of information technology. We highlight the importance of online brand, and investigate the relationship between an online community and the online brand. This study examines how online brand community characteristics affect community commitment and brand loyalty and, in particular, how the type of online brand community affects the relationships between the characteristics and community commitment. A survey of 250 respondents revealed that both interaction and reward for the activities significantly influenced the community commitment, while the community commitment was affected by neither information quality nor system quality. The results of analysis also showed that the hosting type of a community has a significant moderating effect and that the community commitment increases brand loyalty. Interpretations and implications of the findings, as well as future research directions, are discussed.
Can Lucas-Kanade be used to estimate motion parallax in 3D cluttered scenes?
Authors: V. Couture, M. S. Langer
Venue: Proceedings of the Fourth Canadian Conference on Computer and Robot Vision (2007)

When an observer moves in a 3D static scene, the motion field depends on the depth of the visible objects and on the observer's instantaneous translation and rotation. By computing the difference between nearby motion field vectors, the observer can estimate the direction of local motion parallax and in turn the direction of heading. It has recently been argued that, in 3D cluttered scenes such as a forest, computing local image motion using classical optical flow methods is problematic since these classical methods have problems at depth discontinuities. Hence, estimating local motion parallax from optical flow should be problematic as well. In this paper we evaluate this claim. We use the classical Lucas-Kanade method to estimate optical flow and the Rieger-Lawton method to estimate the direction of motion parallax from the estimated flow. We compare the motion parallax estimates to those of the frequency based method of Mann-Langer. We find that if the Lucas-Kanade estimates are sufficiently pruned, using both an eigenvalue condition and a mean absolute error condition, then the Lucas- Kanade/Rieger-Lawton method can perform as well as or better than the frequency-based method.
Predicting Defects for Eclipse
Authors: Thomas Zimmermann, Rahul Premraj, Andreas Zeller
Venue: Proceedings of the 29th International Conference on Software Engineering Workshops (2007)

We have mapped defects from the bug database of Eclipse (one of the largest open-source projects) to source code locations. The resulting data set lists the number of pre- and post-release defects for every package and file in the Eclipse releases 2.0, 2.1, and 3.0. We additionally annotated the data with common complexity metrics. All data is publicly available and can serve as a benchmark for defect prediction models.