Introduction to Home Networking and Its Programming Environment as a Pervasive Computing Model

Hong, Gunho,Song, Hayoon Research Institute for Science & Technology HONG-I 2002 Hongik Journal of Science and Technology Vol.6 No.-

The traditional home appliances which were not considered as computing platform become smart devices with the advance of microprocessor technology. And the proliferation of Internet made the home as a major information consuming place. These phenomenon have converged into home networking. Home network can be defined as network of smart devices with access to broadband network. Smart devices with networking capabilities can provide various applications and service model. In this paper, the core characteristics of home network are described as a pervasive computing model. Then the standards and the problems addressed by the standard technologies are examined. By viewing the home network as software development environment, the programming environment of smart device for home network is presented in depth. The evolution of home networking and realization of pervasive computing environment are discussed at the end of this paper.

Anisotropic Propagation Nature of Electromagnetic Wave in a Magnetized Plasmas

Lee,Jeong-Hae Research Institute for Science & Technology HONG-I 1998 Hongik Journal of Science and Technology Vol.2 No.-

The fast magnetosonic wave(FW) utilized for RF noninductive current drive in magnetized plasmas has been investigated with both theoretical and experimental approach to improve the understanding of FW propagation and coupling. The calculation results with typical DⅢ-D experimental parameters represent that the FW propagates into magnetized plasmas with a low divergence angle. The X-mode reflectometry(65-73 GHz) as a experimental tool was employed to locally monitor the coherent fluctuations in density and magnetic field induced by the FW electric field inside a plasma. The experimental data illustrated that the FW propagates with a lower divergence angle, i.e., anisotropic propagation nature. This is consistent with theoretical expectations. It has been observed that multiple pass components are dominant near the plasma center and, thus, the FW reflectometer signals with co- and counter- phrasings are comparable. This excellent FW penetration capability into the plasma core is advantageous to RF noninductive current drive.

A Framework for an Implementation of a Software RAID file System on Workstation Clusters

Byun, Seok-Gyu,Noh, Sam H Research Institute for Science & Technology HONG-I 1997 Hongik Journal of Science and Technology Vol.1 No.-

A software RAID file system is defined as a system that distributes data redundantly across an array of disks attached to each of the workstations connected on a high-speed network. This configuration provides higher throughput and availability compared to conventional file systems. In this paper, we present a framework for an implementation of the HiS-RAID(Hong-Ik University Software RAID) file systems for a workstation cluster. To implement such a system, various practical issues must be considered. This paper does this on two specific issues, namely, the distribution of data among the cluster and efficient catching for such an environment. Through simulation studies we investigate various data distribution methods as well as anew catching scheme that may be implementable on HiS-RAID.

Synthesis of Several Organometallic Compounds as Electroluminescent Materials

Ha,Yun-kyoung Research Institute for Science & Technology HONG-I 1998 Hongik Journal of Science and Technology Vol.2 No.-

To develop practical electroluminescent devices, a lot of efforts such as finding a good candidate for emitter materials, employing a variety of hole transporting layers, and incorporating electron transporting materials to the devices have been made by many researchers. As one of there efforts, synthesis of eight organometallic complexes for the use as emitter materials in electroluminescent devices was performed here in. The compounds synthesized in this study include Be(bq)₂, Zn(bq)₂, Be(mq)₂, Zn(mq)₂, Be(box)₂, Zn(box)₂, Tb(MeOBB)₃, and Eu(MeOBB)₃[where bq = the anion of 10-hydroxybenzo[h]quinoline; mq = the anion of 8-hydroxyquinaldine; box = the anion of 20)20hydroxyphenyl)benzoxazole; MeOBB = 4-methoxy benzoylbenzoate] As a ligand for the lanthanide ions(Tb and Eu), MeOBB was also synthesized in this study. The luminescence colors of solid compounds listed above were reviewed through the 365nm light irradiation. These compounds will be applied to electroluminescence devices as emitter materials and/or electron transporting layers, and their applicability for the efficient electroluminescent devices will be shortly evaluated.

Representative Strain Value Based Adaptive Mesh Generation for Plane Stress Problems

Jeong, Yochan,Yoon, Chongyul Research Institute for Science & Technology HONG-I 2003 Hongik Journal of Science and Technology Vol.7 No.-

The finite element method is one of the most widely used method of structural analysis that has wide applications in diverse fields of engineering and science. The method has been proven effective and reliable in many practical problems. One of the reasons for the methods' popularity is its ease of use, but still the user has to input a finite element mesh which affects the accuracy of the results. The knowledge required to form an effective mesh for a given problem is somewhat complex and for sometime there has been research effort to automate the generation of the mesh and this is called the adaptive mesh generation scheme. A good adaptive mesh scheme seemed to require an accurate assessment of error and generally this requires some additional computation. This paper looks into the possibility of generating adaptive meshes based on representative strain values in each finite element. The proposed adaptive scheme does not require additional computations other than that used for looking up the data values already computed as finite element analysis results and simple manipulations of these data. Two plane stress problems, a plate with a hole and a deep beam with a concentrated load at the end, are considered to show the progress of the improved generation of adaptive meshes using the scheme.

Table extraction and analysis algorithm from document images

Lee,Kyoung Mu,Lee,Sang Hyeop Research Institute for Science & Technology HONG-I 1998 Hongik Journal of Science and Technology Vol.2 No.-

A new algorithm to detect a table and analyze its layout structure in a document image is presented in this paper. This technique enables intelligent and robust processing of table images, and hence greatly enhance the performance of the existing OCR system so that it can be applied efficiently to a lot of real applications. Moreover, since the proposed preprocessing techniques including noise cancelling, line extraction, and corner feature detection shows excellent performance, it can be applied efficiently to similar problems in document and form processing tasks. The experimental results with real images of tables show that the performance of the proposed algorithm is quite reliable and accurate.

Reactive Blending of Starch

Jun,Chang Lim Research Institute for Science & Technology HONG-I 1998 Hongik Journal of Science and Technology Vol.2 No.-

PLA was blended with starch using some kind of reactive agents during extrusion processing. Tensile strength and elongation at break of the products were investigated. Mechanical properties of blends of PLA and starch in conventional extrusion were very poor. But, it was much improved when the extrusions were processed with reactive agents and plasticizers.

Input Data Transform for Improving Machine Learning Capabilities

Park,Jong-suk,Lee,Kee-cheol Research Institute for Science & Technology HONG-I 1998 Hongik Journal of Science and Technology Vol.2 No.-

Real world data have many attributes, some of which are continuous, or redundant. It is well known that there may exist attributes which impede the machine learning capabilities. In this paper, two pre-processing schemes are studied. One is the automatic selection of attributes, and the other is the conversion of continuous to discrete attributes. The pessimistic error rates combined with FG-MIFS schemes are used to select the appropriate attributes automatically. What is important is that the number of attributes is also automatically decided. For the conversion of continuous to discrete attributes, entropy based methods are used with some heuristics. The resulting reduced continuous-attribute-free data set was successfully shown to be effective by massive experimentations.

Dimensionality and Feature Selection in Pattern Recognition

Choi,Kyung-Mee Research Institute for Science & Technology HONG-I 1998 Hongik Journal of Science and Technology Vol.2 No.-

Peaking phenomenon, optimal number of features based on the probability of misclassification, the probability of correct classification and several classification algorithms are reviewed, and compared. Some recent robust nonparametic location test are mentioned so that they can be further developed to be used for the feature extraction.

Implementing Distributed Optimal Power Flow Using the Alternating Direction Method

Park,Marn-Geun,Kim,Ho-Woong,Kim,Balho H. Research Institute for Science & Technology HONG-I 1998 Hongik Journal of Science and Technology Vol.2 No.-

This paper presents a mathematical approach to implementing distributed optimal power flow (OPE), wherein a regional decomposition technique is adopted to parallelize the OPF. Two mathematical decomposition coordination methods are introduced first to implement the proposed distributed scheme: the Auxiliary Problem Principle (APP), and the Alternating Direction Method(ADM). Then two alternative schemes for modeling distributed OPF are introduced ; the Dummy Generator-Dummy Generator(DGDG) scheme and Dummy Generator-Dummy Load(DGDL) scheme. We present the mathematical analyses of the proposed approach, and demonstrate the approach on several medium size systems, including IEEE Test Systems and parts of the ERCOT(Electric Reliability Council of Texas) system.