Distributed Map Animation Services for Spatiotemporal Datasets Modular Data Hiding as an Alternative of Classic Data Hiding for Web-based Applications Automatic White Balance Algorithms for Digital Still Cameras - a Comparative Study Adaptive Load Control of Service Oriented Architecture Server Zero Pronoun Distribution in Bulgarian: A Comparative Study
A. Sayar
Key Words:
Distributed systems; animation; GIS; animated map; spatiotemporal data.
Abstract:
Maps are an excellent way to present data that have spatial components. However, when the data being presented vary over time, a simple two-dimensional map ignores an important feature of the data. An animated map that shows a series of two-dimensional maps at successive points in time allows one to add a time dimension to the display of data. The study presented in this paper proposes a distributed service-oriented architecture to create map animations from spatiotemporal datasets. we extend open standards'GIS web services definitions with topic-based publish-subscribe paradigm, which best suits to the animation requirements. The effectiveness of the technique is demonstrated on exploratory data analysis on Turkey's earthquake seismic data records at the end of the paper.
S. Ilchev, Z. Ilcheva
Key Words:
Data hiding; digital steganography; digital watermarking; web-based applications; modularity.
Abstract:
Data hiding methods improve the security of the transmission and storage of information by embedded digital data inside the content of multimedia files. Classic data hiding methods, products and services reviewed in this paper are optimized for a specific purpose and have a monolithic design. Usually, they do not take into consideration some important requirements of the contemporary World Wide Web. Modular data hiding and a corresponding SaaS approach are being developed as a viable alternative oriented towards the needs for adaptability and reliability of modern web-based applications and their users.
G. Zapryanov, D. Ivanova, I. Nikolova
Key Words:
Automatic white balance; digital photography; color temperature.
Abstract:
Automatic white balance is an important function of digital still cameras. Failure to estimate illumination chromaticity correctly will result in invalid overall color cast in the final image. The goal of automatic white balancing is to estimate accurately the color of the overall scene illumination and to make the image look as if it is taken under canonical light. This article discusses some of the basic white balance algorithms, making a comparison between them, and proposes a modification of one of the methods. For comparison purposes, test images are used, taken at different settings of white balance of digital still camera, various color temperatures of the scenes, and under six calibrated illumination environments.
I. Atanasov
Key Words:
Service oriented architecture; application server; admission control; load balancing.
Abstract:
This paper presents an adaptive algorithm for improving the utilization of application server for open access to network functions. This type of application server deals with differently prioritized message flows from both 3rd party applications and the network.The application server model applies admission control and distributed processing and the control strategy takes into account the different activity patterns of the service providers.
D. Grigorova
Key Words:
Anaphora resolution; zero pronouns; zero pronoun resolution; corpus annotation.
Abstract:
Anaphora resolution is a problem which arises when the natural language processing program has to determine whether two words or phrases relate to the same entity. There exist no universal algorithms which definitely solve this problem and find the antecedent of the anaphoric pronoun. When the anaphor is not explicity lexically realized, i.e. zero anaphor, the task goes through its preliminary identification. This paper reports on the distribution of zero pronouns in Bulgarian. Z-corpora were created for this purpose. They consist of almost 35500 words and more than 1000 zero pronouns which have been manually annotated. The Z-corpora include texts from four different genres: legal, literary, news and encyclopedic. We not only established the distribution of zero pronouns in Bulgarian and compared it across different genres, but found typical Bulgarian heuristic rules, which will be used for improvement of our zero pronoun resolution algorithm.