폴 크레의 건축에 나타난 보자르적 특성에 관한 연구

김정곤 건국대학교 산업기술연구원 2005 건국기술연구논문지 Vol.30 No.-

The purpose of this study is to analyze the Beaux-Arts model as modern educational system focused on Paul P. Cret's architecture. The study process is to investigate his writings on American Beaux-Arts system and his architecture indicating Beaux-Arts composition related to American classicism. It is Paul Cret who influenced the establish-ment of academic system a professional practice. The artistic and academic nature of architectural practice is the essence of Beaux-Arts movement to redefine a modern profession. By stressing the importance of the his achieved through a rigorous training in Beaux-Arts system, the formulation of a rational method and vocabulary of american modern made possible practice and architectural education through design methodology focusing on planar form.

일반적인 전원을 포함하는 평판구조에 대한 정확한 Closed-form 그린함수

강연덕,이택경,Kang Yeon-Duk,Lee Taek-Kyung 대한전자공학회 2004 電子工學會論文誌-TC (Telecommunications) Vol.41 No.6

정확한 closed-form 근린함수 계산방법은 공간영역 그린함수에 포함된 Sommerfeld 적분의 계산시간을 줄이기 위해 기존에 이용되어온 복소 영상법(Complex image method)과 2단계 근사화법(Two-level approach)에 비해 훨씬 적은 오차를 갖는다. 본 논문에서는 정확한 closed-form 그린함수 계산방법을 일반적인 전원을 포함하는 평판구조에 적용하는 방법을 제안하였다. In the integration of Sommerfeld type for space domain Green's function, a accurate closed-from Green's function method provides more exact solution than the typical complex image method and two-level method. The accurate closed-form Green's function method is applied to obtain the space domain Green's functions of planar structures with general sources. Please put the abstract of paper here.

Structural Design and Characterization of a Channel-forming Peptide

( Chartchai Krittanai ),( Sakol Panyim ) 생화학분자생물학회 2004 BMB Reports Vol.37 No.4

A 16-residue polypeptide model with the sequence acetyl-YALSLAATLLKEAASL-OH was derived by rational de novo peptide design. The designed sequence consists of amino acid residues with high propensity to adopt an alpha helical conformation, and sequential order was arranged to produce an amphipathic surface. The designed sequence was chemically synthesized using a solid-phase method and the polypeptide was purified by reverse-phase liquid chromatography. Molecular mass analysis by electro-spray ionization mass spectroscopy confirmed the correct designed sequence. Structural characterization by circular dichroism spectroscopy demonstrated that the peptide adopts the expected alpha helical conformation in 50% acetonitrile solution. Liposome binding assay using Small Unilamellar Vesicle (SUV) showed a marked release of entrapped glucose by interaction between the lipid membrane and the tested peptide. The channel-forming activity of the peptide was revealed by a planar lipid bilayer experiment. An analysis of the conducting current at various applied potentials suggested that the peptide forms a cationic ion channel with an intrinsic conductance of 188 pS. These results demonstrate that a simple rational de novo design can be successfully employed to create short peptides with desired structures and functions.

Structural Design and Characterization of a Channel-forming Peptide

Krittanai, Chartchai,Panyim, Sakol Korean Society for Biochemistry and Molecular Biol 2004 Journal of biochemistry and molecular biology Vol.37 No.4

A 16-residue polypeptide model with the sequence acetyl-YALSLAATLLKEAASL-OH was derived by rational de novo peptide design. The designed sequence consists of amino acid residues with high propensity to adopt an alpha helical conformation, and sequential order was arranged to produce an amphipathic surface. The designed sequence was chemically synthesized using a solid-phase method and the polypeptide was purified by reverse-phase liquid chromatography. Molecular mass analysis by electro-spray ionization mass spectroscopy confirmed the correct designed sequence. Structural characterization by circular dichroism spectroscopy demonstrated that the peptide adopts the expected alpha helical conformation in 50% acetonitrile solution. Liposome binding assay using Small Unilamellar Vesicle (SUV) showed a marked release of entrapped glucose by interaction between the lipid membrane and the tested peptide. The channel-forming activity of the peptide was revealed by a planar lipid bilayer experiment. An analysis of the conducting current at various applied potentials suggested that the peptide forms a cationic ion channel with an intrinsic conductance of 188 pS. These results demonstrate that a simple rational de novo design can be successfully employed to create short peptides with desired structures and functions.

Forming Limit Calculation based on the M-K Model with Yld96 yield function

Yanshan Lou,Hoon Huh,Seokbong Kim,Changsoo Lee 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

This paper deals with the forming limit diagrams (FLDs) of DP590 steels based the Marciniak-Kuczynski model (M-K model) using Barlat’s Yld96 yield function. Hill48 yield function is also used in the M-K model for the purpose of comparison. Uniaxial tension tests are carried out for the parameter characterization in the yield functions. The yield stress of the balance biaxial tension is referred from Lee et. al’s work. The Downhill Simplex method proposed by Nelder and Mead is used for calculating the anisotropic coefficients because of the high nonlinearity of the equations. Johnson-Cook (J-C) model is adopted to consider the dynamic material properties. The initial inhomogeneous factor in the M-K model is adjusted so that the predicted limit strain of the plane strain condition (FLD?) is the same as that from experiments. The yield loci, the directionalities of the Rvalues and the yield stresses based on Hill48 and Yld96 yield criteria are compared with experimental data. Yld96 yield criterion predicts the precise R-values and the yield stresses in rolling, diagonal and transverse direction and the yield stress of balanced biaxial tension condition. Hill48 yield criterion overestimates the FLDs and Yld96 yield function predicts the FLDs better comparing with hill48 yield criterion. However, the predicted FLDs using Yld96 yield criterion still overestimates the formability of the steel. This discrepancy might be caused by the slightly strain path change in the experiment, which is validated by the finite element computation.

화포탐지 레이다용 C-대역 평면형 능동위상배열 안테나 개발

김기호,김현,김동윤,진형석 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.12

This paper describes the development and measurement results of C-band planar active phase array antenna for detecting and tracking radar(weapon-locating radar). The antenna is designed with 14 sub-arrays(12 main channels and 2 sidelobe blanking channels and approximately 3,000 elements of transmit–receive channel) to generate transmit and digital receive patterns. Using a near-field measurements facility, G/N, transmit patterns, and received patterns are measured. Receive patterns are implemented with digital beamforming by signal processing. The measurement results demonstrate that antenna design specifications were fulfilled.

Vectorial Method of Minimum Zone Tolerance for Flatness, Straightness, and their Uncertainty Estimation

Roque Calvo,Emilio Gómez,Rosario Domingo 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.

Flatness and planar straightness are fundamental form tolerances in engineering design and its materialization through manufacturing processes. Minimum zone tolerance is a preferred approach of flatness and straightness for widely accepted ISO and ANSI standards. In this paper, we propose a novel accurate method of minimum zone tolerance based on vectorial calculus of point coordinates. The non-linear minimax formulation of the original flatness or straightness problem is transformed into a set of linear problems. Next, the optimal solution of the envelop planes or lines is reached through vectorial calculus for both flatness and planar straightness. Then, the developed algorithms are compared to a selection of methods with published tests in recent and classic literature on the topic, reaching the best attained accuracies or outperforming them in the trials. Finally, we propose a new decomposition of the uncertainty contributions for analysis and the improvement of sampling strategy. We conclude remarking the practical contributions of the proposals.

큐브위성용 평면배열안테나의 isoflux 방사특성유도에 관한 연구

정진우,표성민 한국전기전자학회 2020 전기전자학회논문지 Vol.24 No.3

In this paper, we studied the derivation method of isoflux radiation for a planar array antenna. The presented arrayantenna was designed for considering of 1U-sized CubeSAT with Ku-band communications. For the presented arrayantenna, 8×8 radiating elements were arranged, and the distance between radiating elements was set of half-wavelength. The excited current weighting for each radiating elements was calculated by the signal processing technique used in thedesign of the low-pass filter. As a result of analysis of the method proposed in this paper, it was confirmed that aseamless isoflux pattern can be derived. 본 논문에서는 Ku대역 통신시스템을 사용하는 큐브 위성에 장착이 가능한 평면배열안테나 있어, isoflux 방사특성을 유도하기위한 급전신호 가중치 분석에 관하여 연구하였다. 평면배열안테나는 큐브위성 장착성을 고려하여 8*8개의 방사소자를평면 배열하였으며, 각 축 기준 방사소자 간 간격은 0.5 lambda로 설정하였다. isoflux 방사특성 유도를 위한 급전신호 가중치는 저대역 통과필터 설계에 활용되는 신호처리 기법을 이용하여 산출하는 방법을 제시하였다. 본 논문에서 제안된 방법의분석 결과 원활한 isoflux 패턴을 유도할 수 있음을 확인하였다.

韓國 古代 木簡의 分類 方案

김재홍 한국목간학회 2022 목간과 문자 Vol.- No.28

This paper examines the meaning of number classification of ancient Korean wooden documents by stage after being excavated from the ruins and storing them in a storage(relic storage), and classifies the types of wooden documents based on the planar conformation. Thorough this, it was intended to promote the convenience of search by identifying the appearance of wooden documents, and to prepare a classification standard of wooden documents. The classification plan between wooden documents can be largely divided into number classification and type classification. The number of wooden documents is a classification that easily identifies the wooden documents with the name of wooden documents, and it is numbered step by step in the process of organizing. wooden documents will be given numbers such as ①The location number of the excavated site, ②The number of the organization, ③The number of the report, and ④The number of national attribution number(official number goven by the country). The type classification of wooden documents set up on consideration of the planar conformation, the upper and lower(upper and lower ends), and cross-sectional shape. Considering the planar conformation of the wooden documents, it was classified into Ⅰ: elongated square type, Ⅱ: bar type, and Ⅲ: crumb type for set as a standard. 이 글은 한국 고대 목간을 대상으로 유적에서 출토된 이후 수장고에 수장하는 단계별로 번호 분류의 의미를 살피고 평면 형태를 기준으로 목간의 형식을 분류하였다. 이를 통해 목간의 외형적인 특성을 파악하여 검색의 편리성을 도모하고 목간의 분류 기준을 마련하고자 하였다. 목간의 분류 방안은 크게 번호 분류와 형식 분류로 나눌 수 있다. 목간의 번호는 목간의 명칭과 더불어 목간을 쉽게 파악하는 분류 방식이며, 정리하는 과정에서 단계별로 번호가 부여된다. 목간은 ①출토 위치 번호, ②정리(임시) 번호, ③보고서 번호, ④국가귀속번호 등의 번호를 부여받게 된다. 출토 위치 번호는 목간의 출토 위치와 층위를 표현한 번호로서 학문적인 자료로서의 지위를 부여 받는다. 목간의 최종적인 번호는 소장 기관의 수장번호를 반영하는 국가귀속번호이며, 목간의 번호 분류의 기준이 되어야 한다. 목간의 형식 분류는 평면 형태와 상·하단 형태, 단면 형태 등을 고려하여 설정하였다. 먼저 목간의 평면 형태를 고려하여 Ⅰ: 장방형, Ⅱ: 봉형, Ⅲ: 부스러기로 분류할 수 있다. Ⅰ: 장방형의 하위 단위로 상단 형태는 알파벳 대문자, 하단 형태는 알파벳 소문자로 세분할 수 있으며, Ⅱ: 봉형의 하위 단위는 단면 형태를 기준으로 아라비아 숫자로 표현한다. 폐기 시의 상황을 고려하여 파손은 ‘×’로 표현하여 현존 상황을 나타낸다

Accuracy Analysis of Anisotropic Yield Functions based on the Root-Mean Square Error

Hoon Huh,Yanshan Lou,Gihyun Bae,Changsoo Lee 한국소성가공학회 2010 기타자료 Vol.2010 No.6

This paper evaluates the accuracy of popular anisotropic yield functions based on the root-mean square error (RMSE) of the yield stresses and the R-values. The yield functions include Hill48, Yld89, Yld91, Yld96, Yld2000-2d, BBC2000 and Yld2000-18p yield criteria. Two kind steels and five kind aluminum alloys are selected for the accuracy evaluation. The anisotropic coefficients in yield functions are computed from the experimental data. The downhill simplex method is utilized for the parameter evaluation for the yield function except Hill48 and Yld89 yield functions after the error functions are constructed. The yield stresses and the R-values at every 15°from the rolling direction (RD) and the yield stress and R-value at equibiaxial tension conditions are predicted from each yield function. The predicted yield stresses and R-values are then compared with the experimental data. The root-mean square errors (RMSE) are computed to quantitatively evaluate the yield function. The RMSEs are calculated for the yield stresses and the R-values separately because the yield stress difference is much smaller that the difference in the R-values. The RMSEs of different yield functions are compared for each material. The Hill48 and Yld89 yield functions are the worst choices for the anisotropic description of the yield stress anisotropy while Yld91 yield function is the last choice for the modeling of the R-value directionality. Yld2000-2d and BBC2000 yield function have the same accuracy on the modeling of both the yield stress anisotropy and the R-value anisotropy. The best choice is Yld2000-18 yield function to accurately describe the yield tress and R-value directionalities of sheet metals.