• Journal of the Korean Wood Science and Technology
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• v.34 no.3
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• pp.8-14
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• 2006

The object of this study was to investigate the carbonization of Quercus variabilis wood samples in pyrolysis system at temperature ranging from 250 to $740^{\circ}C$ to contribute to the knowledge of wood carbonization mechanism. Volume of wood sample decreased with increasing the carbonization temperature, and checks were developed along with radial direction. Weight loss increased with increasing carbonization temperature. During carbonization, tangential direction showed higher shrinkage of vessel diameter than radial direction. SEM observation indicated that the cell walls in wood fibers and parenchyma cells presented the layering structure at $250^{\circ}C$ and $300^{\circ}C$. However, the cross section of cell walls at $340^{\circ}C$ and over showed an amorphous- like structure without cell wall layering. X-ray diffraction presented that the cellulose crystalline substance was still remained in carbonization temperature at $340^{\circ}C$, but it was not detected at $540^{\circ}C$ and over.

• Journal of the Korean Chemical Society
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• v.58 no.3
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• pp.251-257
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• 2014

The stress relaxation of poly(methyl acrylate)-poly(acrylonitrile) copolymer samples were carried out in air and distilled water at various temperatures using the tensile tester with the solvent chamber. The rheological parameters were obtained by applying the experimental stress relaxation curves to the theoretical equation of the Eyring-Halsey non-Newtonian model. The self diffusion, hole volume, viscosities, and thermodynamic parameters of copolymer samples were calculated from rheological parameters and crystallite size in order to study of flow segments in amorphous region. It was observed that the rheological parameters of these copolymer samples are directly related to the self diffusion, hole volume, viscosities, and thermodynamic parameters of flow segments.

• Journal of architectural history
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• v.26 no.5
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• pp.7-18
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• 2017

The 1960s in Britain was the period of rapid economic and social change. Under this circumstance, the visionary architect Cedric Price designed the Fun Palace, of which idea came from the theatre producer, Joan Littlewood. They hoped this place to be an improvisational learning space, so Price proposed the building as 'kit of parts' which can respond to programmatic indeterminacy. Cybernetics was introduced to control this flexibility dramatically changed the character of the project from 'theatre of people' to 'interactive machine'. That resulted in the change of the status of user from subjective human beings to abstract data in the cybernetic algorithm as well, and led the project to a completely opposite direction from that Price intended. After Fun Palace, cybernetics technology could still be found in his other projects, and it can be assumed that this was because the algorithmic system of cybernetics were on the same line of thought of Price's idea - anti-building or 'kit of parts'. The effects of cybernetics varied in projects; Similar negative effect in Fun Palace can be found in Generator project, but on the other hand, in Potteries Thinkbelt project, cybernetics showed a positive aspect by contribution to the development of project on the formal analogy of algorithmic network.

• The Journal of the Korea Contents Association
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• v.15 no.11
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• pp.307-312
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• 2015

Mammography improves image quality that is on the increase day by day and get a picture with the pressure it is essential to reduce the dose. However, because due to the thickness of the cuff itself may increase the dose scattering lines is necessary study on the cuff material. Material that is currently being used in clinical Polycarbonate is a plastic and family. If you try to reduce the exposure of patients than itgie need to consider for the better material in this study to compare against a radiolucent line for amorphous plastic material of the plastic. results radiolucent and half layer, transmitting dose Pixel values HIPS, GPPS, ABS, Tritan, PC, PMMA showed high results in the net.

• Journal of KIISE:Computer Systems and Theory
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• v.26 no.2
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• pp.232-241
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• 1999

기존의 연구는 FSM을 기본으로 제어흐름만을 분석하거나 시험목적을 시험열 생성 단계에서 고려하지 않음으로써 시험열의 실제 적용에 있어 많은 문제점을 갖는다. 따라서 이 연구에서는 SDL로 기술된 프로토콜 명세서를 시멘틱 모델인 LTS로 변환 후 LTS로부터 서브투어 단위로 시험열을 생성하였다. 그리고 생성된 시험열을 TTCN으로 변환하고 단위 테스트를 위한 추가 정보로서 프리앰블, 포스트앰블, 리셋 정보등을 LTS로부터 생성하였다. 또한 LTS로부터 한 노드에서 전이 가능한 모든 경로를 트리로 표현함으로서 향상된테스트 커버리지를 갖는 서브투어를 생성하였으며 SDL을 시맨틱 모델인 STS로의변환 EH한 기존의 입력과 출력만을 고려하는 FSM에서 발생하는 비결정성 문제를 해결할 수 있다. 따라서 이 연구에서의 테스트 목적이 고려된 TTCN 표현의 테스트 케이스 생성은 적합성 시험을 위한 테스스 케이스의 실제 적용 및 프로토콜 구현의 생산성을 높일 수 있으며 테스팅 환경의 기반을 제공한다.

• Journal of the Korean Applied Science and Technology
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• v.36 no.4
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• pp.1050-1059
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• 2019

The self diffusion, hole volume, and flow thermodynamic parameters of polyamide fibers were calculated from rheological parameters and crystallite size in order to study of flow segments in amorphous region. The stress relaxation of polyamide filament fibers were carried out in air and various solvents at various temperatures using the tensile tester with the solvent chamber. The rheological parameters were obtained by applying the experimental stress relaxation curves to the theoretical equation of the Ree-Eyring and Maxwell non-Newtonian model. It was observed that the rheological parameters of these polyamide filament fibers are directly related to the relaxation spectra, self diffusion, viscosities, and activation energies of flow segments.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.5
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• pp.1108-1113
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• 2004

‘Set’ is a tool that is used frequently in designing computer programs. Because of the reason, ‘set constraints languages’ have been developed recently. In this research, we introduce ‘(Ab)(Cl) set unification’ problem and implement it using the ‘set equation rewriting in Prolog’. In this research we shows that the set unification, that is considered to be difficult to be implemented in procedural languages, ran be implemented easily using the non-deterministic control structure and the list data structure in logic language like Prolog. Our research uses the Ciao Prolog with GNU GPL, this is compared with other existing implementations which used expensive commercial Prolog, so anyone can use the result freely. Currently the result is being used for implementing a set constraint language.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.2
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• pp.289-295
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• 2010

Injection molding process is one of the most important methods to produce plastic parts with high efficiency and low cost. Today, injection molded parts have been increased dramatically the demand for high strength and quality applications. In this study, In-line skates are made of Al alloy and plastic materials to replace the frame for the optimization process is all about. I interpreted through mold design, Injection molding process that minimizes the runner and the gate dimension will determine the size and shape. Runner and gate dimensions of change based on availability of the product, I'll discuss the injection molding. This report investigates that the optimum injection molding condition for minimum of shrinkage. The FEM Simulation CAE tool, Moldflow, is used for the analysis of injection molding process.

• Journal of KIISE:Databases
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• v.27 no.1
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• pp.79-89
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• 2000

For processing signature file in parallel, an effective signature file declustering method is needed. The Linear Code Decomposition Method(LCDM) used for the Hamming Filter may give a good performance in some cases, but due to its static property, it fails to evenly decluster signature file when signature are skewed. In addition, it has other problems such as limited scalability and non-determinism. In this paper we propose a new signature file declustering method, called Inner-product method, which overcomes those problems in the LCDM. The Inner-product method declusters signature file dynamically based on the signature difference which is computed by using signature inner product. we show through the simulation experiment that the Inner-product outperforms the LCDM under various data workloads.

• Applied Chemistry for Engineering
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• v.20 no.5
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• pp.527-531
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• 2009

Periodic mesoporous organosilicas (PMO) were synthesized using bis(triethoxy silyl) benzene as the precursor and dodecyl trimethyl ammonium bromide (DTMA) as the templating agent. From these results of XRD, TEM, and NMR, the pore structure of the material was confirmed to have a well-organized hexagonal structure. Poly(ethylene oxide) (PEO) was penetrated into PMO. From the DSC and XRD experiments, the polymer melting transition of crystalline polyethylene oxide (PEO) decreased then finally disappeared. These results prove that the polymer chains penetrate into the PMO channels, and penetrated polymer chains are constrained inside channels of PMO.