• 대한전자공학회논문지TC
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• 제43권2호
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• pp.22-26
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• 2006

대칭형 암호알고리즘은 고속의 데이터 처리 및 구현상의 용이성 둥의 장점에도 불구하고 인증기능의 부재로 인하여 네트워크 환경에는 부적합하다. 그러므로 대칭형 암호알고리즘이 인증기능을 수행할 수 있도록 MAC와 MDC를 이용한 혼합형 인증알고리즘을 제안하였다. 제안된 알고리즘은 대칭형 암호알고리즘과 별개로 동작하는 것이 아니라 암호알고리즘 자체에 인증기능을 수행할 수 있도록 함으로서 보안이 확보된 통신채널의 범위를 넓힐 수 있도록 하였다.

• 한국전자통신학회논문지
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• 제2권3호
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• pp.150-156
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• 2007

본 논문에서는 정보화 사회와 더불어 네트워크 환경에서 사용하는 여러 시스템들의 정보보안을 위한 보안 시스템을 연구하였다. 이에 따라 복잡성 및 낮은 처리 속도 등의 문제를 해결하기 위하여 블록 및 스트림 방식을 적용한 대칭형 기반 혼합형 암호 시스템을 설계하였다. 인증 기능을 포함한 대칭형 기반 혼합형 암호 시스템은 처리 속도와 계산량이 비대칭형보다 우수한 성능을 가지고 있다. Synopsys 1999.10과 ALTERA MaxPlus 10.1로 시스템을 설계하여 시뮬레이션을 한 결과 제안된 혼합형 암호 시스템은 네트워크 환경에서 정보보안이 필요한 분야에 매우 효율적인 지원과 성능을 제공할 것이다.

• 대한수학회보
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• 제54권3호
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• pp.799-816
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• 2017

In this paper, we investigate the Bonnesen-style Aleksandrov-Fenchel inequalities in ${\mathbb{R}}^n$, which are the generalization of known Bonnesen-style inequalities. We first define the i-th symmetric mixed homothetic deficit ${\Delta}_i(K,L)$ and its special case, the i-th Aleksandrov-Fenchel isoperimetric deficit ${\Delta}_i(K)$. Secondly, we obtain some lower bounds of (n - 1)-th Aleksandrov Fenchel isoperimetric deficit ${\Delta}_{n-1}(K)$. Theorem 4 strengthens Groemer's result. As direct consequences, the stronger isoperimetric inequalities are established when n = 2 and n = 3. Finally, the reverse Bonnesen-style Aleksandrov-Fenchel inequalities are obtained. As a consequence, the new reverse Bonnesen-style inequality is obtained.

• ETRI Journal
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• 제32권1호
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• pp.166-168
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• 2010

We investigate the possibility of using adiabatic logic as a countermeasure against differential power analysis (DPA) style attacks to make use of its energy efficiency. Like other dual-rail logics, adiabatic logic exhibits a current dependence on input data, which makes the system vulnerable to DPA. To resolve this issue, we propose a symmetric adiabatic logic in which the discharge paths are symmetric for data-independent parasitic capacitance, and the charges are shared between the output nodes and between the internal nodes, respectively, to prevent the circuit from depending on the previous input data.

• 복식
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• 제57권9호
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• pp.161-176
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• 2007

The objectives of this study are to select and analyze unpublished wedding dresses in the 19th century, to investigate the design characteristics and making techniques of Victorian wedding dresses, and to examine the correlation between the wedding dress style and the fashion style in those days and the influence of the wedding dress style on contemporary's styles. The materials of this study were 9 wedding dresses owned by the Historical Costume and Textile Collection at the University of Connecticut in USA. The dresses were made during the mid and late Victorian Age. As for silhouette, the bustle style was popular in the 1870s and 1880s, and the hourglass style in the 1890s, and different from contemporary dresses there were no big differences in structural pattern and details between ordinary dresses and wedding dresses. In addition, colored wedding dresses were used until the mid and late Victorian Age, but since the wedding ceremony of Queen Victoria in 1840, white wedding dress was widely accepted and settled as the tradition of today's wedding dresses. While the Western dress style had been basically a one piece style, there appeared simple two piece designs in which the upper garment was separated from the lower one, from the mid Victorian Age. This is considered the reflection of those days' pragmatic social trend in dress style. It seems around 1875 when asymmetric design was first introduced in the Western dress style, which had been mostly symmetric. The asymmetric style that pursued atypical beauty, though not common during the late Victorian Age, shows a change in the typical Western dress style. With regard to dress making techniques, sewing machines were distributed widely during the early Victorian Age but they were not used in all parts of dress. Most of details and trimming works were done manually and some parts were attached and detached by hand sewing. In addition, not like today, there were no generalized rules of making such as the form of closings and composition.

• 대한원격탐사학회지
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• 제19권1호
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• pp.61-70
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• 2003

This paper proposes an autonomous approach to localize the center of fiducial marks included in aerial photographs without precise geometric information and human interactions. For this localization, we present a conceptual model based on two assumptions representing symmetric characteristics of fiducial area and fiducial mark. The model makes it possible to locate exact center of a fiducial mark by checking the symmetric characteristics of pixel value distribution around the mark. The proposed approach is composed of three steps: (a) determining the symmetric center of fiducial area, (b) finding the center of a fiducial mark with unit pixel accuracy, and finally (c) localizing the exact center up to sub-pixel accuracy. The symmetric center of the mark is calculated tv successively applying three geometric filters: simplified ${\nabla}^2$G (Laplacian of Gaussian) filter, symmetry enhancement filter, and high pass filter. By introducing a self-diagnosis function based on the self-similarity measurement, a way of rejecting unreliable cases of center calculation is proposed, as well. The experiments were done with respect to 284 samples of fiducial marks composed of RMK- and RC-style ones extracted from 51 scanned aerial photographs. It was evaluated in the visual inspection that the proposed approach had resulted the erroneous identification with respect to only one mark. Although the proposed approach is based on weak constraints, being free from the exact geometric model of the fiducial marks, experimental results showed that the proposed approach is sufficiently robust and reliable.

• 한국의류산업학회지
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• 제4권2호
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• pp.117-127
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• 2002

Patterns presented at baroque were mostly floral pattern. Abstract anonymous flower, tulip, Acandus leaf, pomegranate were blended with one another and had a distinct leaning toward continuation and repetition. Components of design could be classified into flower and leaf, flower and fruit, flower and circumferential ornament, bunch of flowers, flower and pot, flower and geometry, and flower and animal. Floral patterns in this era were mostly fullness type being large, simple, and having more formalized motive and were fronted with unit type and vine shape. Unit type shows reflection of baroque style which aims to present absolute unification rather than freedom, which was inherent property of baroque style, by using symmetric pattern. Vine type were unfolded with C type curved line which was main characteristics of that time and showed flowage as a whole and pliable beauty. Floral pattern was filled the whole surface of fabric, thus background of fabric can not be discerned. So, it showed extreme decorative tendency and lavishness.

• 한국전통조경학회지
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• 제32권2호
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• pp.159-166
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• 2014

본 연구는 미국의 대표적인 여류 조경가인 비트릭스 파란드의 덤바튼 오크의 정원분석을 통하여, 파란드의 작품경향 및 미국 1900년대 초의 신고전주의 양식의 특성을 파악하는 것을 목적으로 하였다. 분석 결과, 덤바튼 오크는 유럽의 고전주의 양식의 무조건적인 모방이 아닌, 아트 앤 크래프트의 기본철학을 배경으로 미국의 지역적 특성과 주변환경 및 문화에 맞게 해석하고 적용된 성공적인 사례라고 할 수 있다. 덤바튼 오크의 분석을 통해 도출한 미국 후기 신고전주의 양식의 특성은 다음과 같이 요약할 수 있다. 첫째, 여러 개의 가든룸이 연속적으로 이어진 정원공간은 다양한 지면의 높이를 갖는 테라스로 구성되어 있으며, 자연적 지형을 최대한 이용하였다. 둘째, 정형성과 비정형성의 공존, 대칭 및 의도적인 비대칭의 조화이다. 셋째, 식재선택 및 재식방법에 있어서도 유럽 고전주의 양식과 영국의 아트 앤 크래프트 양식이 공존하며, 공간구성 및 형태와 조화되도록 하였다.

• 복식
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• 제52권7호
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• pp.1-11
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• 2002

The shape of floral Pattern in the Period of Baroque could be divided single. bunch and vine. The style of representation was stylized, abstract and realistic. the most of style was stylized. The type of composition was fullness, independent and scattered. Floral patterns were shaped simple and complex and components of design could be classified into flower and leaf. flower and fruit. flower and band. bunch of flower, flower and geometry. flower and pot, flower and animal. flower and crest. Kinds of flower were tulip. common marigold, lily, carnation, small bel]flower. lotus, acandus leaf, pomegranate, strawberry. pine cone and abstract anonymous flower which were unfolded by repeat. Characters of floral Pattern were classical elegance, taste of royalty and lively and damask, velvet, brocade which made with gold and silver so, those were a very brilliant and gorgeous. Characters of design were illustrated plane style and stylization where developed arranged on front by repeat or repeat symmetric of vertical. Art, costumes and textiles in this era were a very rich and colorful. The result of study on Baroque's floral pattern will be used to develope a various textile design and chance to be adopted classical pattern into aesthetic value in our time.

• 전자공학회논문지CI
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• 제43권2호
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• pp.1-11
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• 2006

본 연구에서는 대칭 및 비대칭 암호화 알고리즘을 가속화하기 위해, 다수 혹은 긴 워드 연산을 위한 레지스터 파일 확장 구조 (Register File Extension for Multi-words or Long-word Operation: RFEMLO)라는 새로운 레지스터 파일 구조를 제안한다. 암호화 알고리즘은 긴 워드 피연산자에 대한 명령어를 통하여 가속화 할 수 있다는 점에 착안하여, RFEMLO는 하나의 레지스터 명을 통해 여러 개의 레지스터에 접근할 수 있도록 하여 여러 연산자에 대해 동일한 연산을 수행할 수 있도록 하거나, 여러 개의 레지스터를 하나의 데이터로 사용할 수 있게 한다. RFEMLO는 긴 워드 피연산자에 대한 명령어 집합의 추가와 이를 지원하는 기능 유닛을 추가함으로서 범용 프로세서에 적용할 수 있다. 제안된 하드웨어 구조와 명령어 집합의 효율성을 평가하기 위해 Simplescalar/ARM 3.0을 사용하여 대칭 및 비대칭의 다양한 암호화 알고리즘에 적용하였다. 실험 결과, RFEMLO을 적용한 순차적 파이프라인을 가진 프로세서에서 대칭 암호화 알고리즘의 경우 $40%{\sim}160%$의 성능 향상을, 비대칭 암호화 알고리즘의 경우 $150%{\sim}230%$의 높은 성능향상을 얻을 수 있었다. RFEMLO의 적용을 통한 성능 항상은 이슈 폭의 증가를 이용한 슈퍼스칼라 구현에 따른 성능 향상과 비교할 때, 훨씬 적은 하드웨어 비용으로 효과적인 성능 향상을 얻을 수 있음을 확인하였으며 슈퍼스칼라 프로세서에 RFEMLO를 적용하는 경우에도 대칭 암호화 알고리즘에서는 최대 83.6%, 비대칭 암호화 알고리즘에서는 최대 138.6%의 추가적인 성능향상을 얻을 수 있었다.