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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.
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.
High-Speed IP Routing Lookups with Fast Updates
Kim, Byung-Yeob,Kim, Kyung-Duk,Choi, Yoon-Hwa Research Institute for Science & Technology, Hong- 2001 Hongik Journal of Science and Technology Vol.5 No.-
Most of the existing IP address lookup schemes emphasize the table lookups with little attention to table updates. Updating the routing table often requires a considerable time overhead, especially for gigabit backbone routers. This paper presents a high-speed lookup scheme with a small bounded update time for IP forwarding engines in IP routers. It performs one IP address lookup per memory access by employing memory access pipelining and updates the table in the time bounded by the IP packet interarrival time on a gigabit link, regardless of the size of the database. The resulting design requires manageably small memories to be implemented using current SRAM technology.
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.
Heuristic technology mapping system for complex FPGAs
Lee, Jun-yong Research Institute for Science & Technology HONG-I 1997 Hongik Journal of Science and Technology Vol.1 No.-
이 논문은 복잡한 logic block 구조를 가진 FPGA 를 위한 technology mapper 를 기술한 것이다. 지금까지 개발된 대다수의 technology mappers는 XILINX XC4000 series와 같은 complex logic block architectures 에는 효율적이지 않았다. 제안된 mapper 는 area, timing, routability 등의 특성을 균형 맞추기 위해 constructive mapping algorithm과 fuzzy logic rules을 적용하였다. Mapper 의 성능은 MCNC benchmarks 의 set으로 실험해 보았다.
Flexural Characteristics of In-Plane Adhesively Bonded Sandwich Joints
Kim,Ik Tai Research Institute for Science & Technology HONG- 1999 Hongik Journal of Science and Technology Vol.3 No.-
This paper is concerned with the mechanical behaviour of in-plane joints in sandwich structures under flexural loads. The impetus behind research stems from the growing development in modular construction techniques that offer competitive global access to higher technology sandwich fabrications. Characterization of flexural response is therefore important, as in most instances the primary role of a sandwich is to impart flexural rigidity. A test program involving several commonly used joining methods, including scarf, internal spline and external tape, coupled with flexible and inflexible adhesives is used to demonstrate the mode of failure and strength of the joined sandwich.
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.
The Development of Software for Adsorptive Oxygen Separation
Choi,Min-Ho Research Institute for Science & Technology HONG- 1999 Hongik Journal of Science and Technology Vol.3 No.-
We developed the software for adsorptive oxygen separation by pressure swing adsorption (PSA) process and investigated the effects of variable valve coefficients on the separation performance. For rapid pressure changing steps such as blow down step and pressurization step, the effect of flow resistance through the valve was considered by valve equation. Linear driving force (LDF) model was used to describe mass transfer between two phases (gas and adsobate solid phase). Coupled Langmuir isotherm was used for each component as a nonlinear adsorption isotherm. In order to consider influence of temperature, energy balance was set up along with mass balance equation. These equations yielded partial differential equations and were solved by numerical method. Several assumptions were made for convenience of simulation. By controlling input data file, separation performance could be obtained for various operating conditions.
Surface Relaxation of Aluminum (100)
Han,Wone Keun Research Institute for Science & Technology HONG- 1999 Hongik Journal of Science and Technology Vol.3 No.-
Using a total energy method based on a first-principles electronic structure calculation, we determined the lattice constant of Aluminum as 3.96 Å and the outward relaxation of +2.46% to the surface layer. The results are consistent with the existing experimental results.
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.