19,205 research outputs found
On co-authorship for author disambiguation
No full textAuthor name disambiguation deals with clustering the same-name authors into different individuals. To attack the problem, many studies have employed a variety of disambiguation features such as coauthors, titles of papers/publications, topics of articles, emails/affiliations, etc. Among these, co-authorship is the most easily accessible and influential, since inter-person acquaintances represented by co-authorship could discriminate the identities of authors more clearly than other features. This study attempts to explore the net effects of co-authorship on author clustering in bibliographic data. First, to handle the shortage of explicit coauthors listed in known citations, a web-assisted technique of acquiring implicit coauthors of the target author to be disambiguated is proposed. Then, a coauthor disambiguation hypothesis that the identity of an author can be determined by his/her coauthors is examined and confirmed through a variety of author disambiguation experiments. (C) 2008 Elsevier Ltd. All rights reserved.X1174sciescopu
OPTICAL DISPERSION OF ALXGA1-XAS AT CRYSTAL-GROWTH TEMPERATURE
No full textThe authors thank Dr. Bun Lee, Gunho Lee, and Ingak
Hwang for helpful discussions
Speech enhancement with MAP estimation and ICA-based speech features
No full textThe authors present a denoising algorithm based on Gabor-like speech features extracted by independent component analysis, that demonstrates much improved signal-to-noise ratio and recognition rates.This research was supported as a Brain Science Researc Center and Engineering department research programme by the Korean Ministry of Science and Technology. Te-Won Lee was partially supported by a National Science Foundation Grant (CCR-9902961)
An efficient multiuser detector with low decision delay for multiple chip rate DS/CDMA mobile radio systems
No full textIn this paper, an efficient multiuser detection scheme with low decision delay is presented for asynchronous multiple chip rate (MCR) DS/CDMA systems in mobile radio channels without any restrictions on processing gains and chip rates. An equivalent synchronous single bit rate DS/CDMA system is first formulated to break up the detection problem into the blocks of finite length called processing windows. Then, a low delay multipath-combining decision-feedback multiuser detector (LDMCDF) is proposed based on the equivalent system model. Since the LDMCDF makes the decisions for data bits in every processing window, the decision delay is less than the interval of one processing window. The effect of the processing window length on the performance of the LDMCDF is evaluated, and the simulation results show that the LDMCDF provides good performance with the negligible decision delay. (C) 2001 Elsevier Science B.V. All rights reserved
Cluster tool module communication based on a high-level fieldbus
No full textA cluster tool for semiconductor manufacturing is an integrated device that consists of several single wafer processing modules and a wafer transport module based on a robot. The distributed module controllers are integrated by an inter-module communication network and are coordinated by a centralized controller, called a cluster tool controller (CTC). Since the CTC monitors and coordinates the distributed complex module controllers for advanced process control, complex communication messaging and services between the CTC and the module controllers are required. A SEMI standard, CTMC (cluster tool module communication), specifies application-level communication service requirements for inter-module communication. We propose the use of high-level fieldbuses-for instance, PROFIBUS-FMS-for implementing CTMC since the high-level fieldbuses are well suited for complex real-time distributed manufacturing control applications. We present a way of implementing CTMC using PROFIBUS-FMS as the communication enabler. We first propose improvements of a key object of CTMC for material transfer and the part transfer protocol to meet the functional requirements of modern advanced cluster tools. We also discuss mapping objects and services of CTMC to PROFIBUS-FMS communication objects and services. Finally, we explain how to implement the mappings
Square-lattice photonic-crystal vertical-cavity surface-emitting lasers
Full text linkThe single mode square lattice photonic-crystal vertical-cavity surface-emitting lasers (PC-VCSELs) are proposed and demonstrated. Square-lattice photonic-crystal patterns of various lattice constants are introduced on top mirrors of VCSELs having two different current apertures. The maximum single mode output power of about 1 mW is obtained from the device with lattice constant of 5.0 mum and current aperture of 16 mum. The PC-VCSEL operates in a single transverse mode in an entire operating current range with a side-mode suppression ratio of over 20 dB. The asymmetric introduction of smaller air holes improves the polarization selectivity. (C) 2004 Optical Society of America.One of the authors, K. H. Lee, would like to thank S. H. Kim for the SEM observations and
the CAIBE etching. This work was supported by the National Research Laboratory Project
and the National R&D Project for Nano Science and Technology of KISTEP, Korea
Description technique for component composition focusing on black-box view
No full textAs component-based software is developed by integrating components that are implemented independently, expressing the usage protocols of each component is essential. However, there is no known proper way to describe them comprehensibly from the point of component user or developer. Black-box (external) point of view of component composition sees component-based development from the user's or the system assembler's point of view. But a description technique necessary to specify the dynamic constraint explicitly is necessary to define the external view more precisely. The key contribution of this paper is to present a technique for describing the structure of components in black-box view using UML 2.0. First, we present the relevant UML notations for describing the black-box point of view and then provide diagrams showing their usage. We further illustrate how this leads to a component based software specification of the structure of composition focusing on the black-box view
A real-time encoding and decoding system for nonlinear HDTV editor
No full textA real-time encoding and decoding system (REDS) for HDTV that can be used for nonlinear HDTV editing in studio has been developed. The intrapicture coding of motion JPEG is implemented and optimized in the REDS so that a high-quality image can be recovered for the nonlinear editing. The REDS has a parallel architecture with multiple programmable digital signal processors (DSP) and reconfigurable field programmable logic devices (FPLD). The HDTV Image is spatially partitioned and concurrently processed by the multiple processors. The programmable DSPs perform the discrete cosine transform and quantization to reduce the spatial redundancy of the HDTV image, whereas the FPLDs perform the variable length coding to reduce the statistical redundancy. In addition, field-based quantization matrices are developed for HDTV images. The REDS has the programmability and the random accessibility of image frames, the two most Important features for a nonlinear HDTV editing system. (C) 2000 John Wiley & Sons. Inc
A Branch and Bound Algorithm for Three-Machine Flow Shop with Overlapping Waiting Time Constraints * *This work was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2016R1D1A1B03930952), and supported by Konkuk University in 2017 (Corresponding author: Jun-Ho Lee)
No full textThis paper focuses on a three-machine flow shop scheduling problem with overlapping waiting time constraints for makespan minimization. In the problem, waiting times of each job between the first two machines and between the first and third machines are constrained by two distinctive time limits, respectively. Such overlapping waiting time constraints are one of the common scheduling requirements in semiconductor manufacturing since up to 20% of whole process steps are controlled with waiting time limits for better quality. For example, wafers completed with chemical treatment on a diffusion machine must be cleaned on a cleaning machine and then should be processed on another diffusion machine. In this case, two waiting time limits are independently applied between diffusion and cleaning machines and between two diffusion machines, respectively. We first identify several dominance properties of the problem and develop a branch and bound algorithm using the properties. We use heuristic algorithms to obtain a good initial solution and derive five different lower bounds. Computational tests are performed for evaluating the performance of the algorithm.
Identifying Top News Stories Based on their Popularity in the Blogosphere
No full textA huge volume of news stories are reported by various news channels, on a daily basis. Subscribing to all the stories and keeping track of the important ones day after day is very time-consuming. This paper proposes several approaches to identify important news stories. To this end, we take advantage of the blogosphere as an information source to evaluate the importance of news stories. Blogs reflect the diverse opinions of bloggers about news stories, and the attention that these stories receive can help estimate the importance of the stories. In this paper, we define the popularity of a news story in the blogosphere as the attention it attracts from users. We measure popularity of the stories in the blogosphere from two viewpoints: content and a timeline. In terms of content, we suggest several approaches to estimate language models for a news story and blog posts, and we evaluate the importance of the story using these language models. Furthermore, we generate a temporal profile of a news story by exploring the timeline of blog posts related to the story, and evaluate its importance based on the temporal profile. We experimentally verify the effectiveness of the proposed approaches for identifying top news stories.X1122sciescopu
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