• 한국멀티미디어학회논문지
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• 제19권2호
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• pp.280-290
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• 2016

In this paper, we propose a layered pattern authentication scheme resistant to social engineering attacks. Existing android pattern lock scheme has some weak points for social engineering attacks. Thus, the proposed scheme improves the existing pattern lock scheme. In our scheme, pattern is recorded by touch screen, however, it is different with existing schemes because of the layered pattern. During the pattern registration process, users register their own pattern with many layers. Thus, registered pattern is 3D shape. When the smudge attack is occurring, the attacker can see the shape of user pattern through the smudge on smartphone screen. However, it is described on 2D surface, so acquired pattern is not fully determine to users original 3D shape. Therefore, our scheme is resistant to social engineering attack, especially smudge attack.

• 한국해양공학회지
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• 제6권2호
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• pp.143-150
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• 1992

Numerical simulation is made of a stably stratified salt-water solution due to lateral heating in an equilateral trapezoidal enclosure using boundary-fitted coordinate in grid generation. Results show four types of the global fluid pattern depending on the buoyancy ratio in the enclosure, i.e., unicell flow pattern for the low buoyancy ratio, layered flow pattern for the increasing buoyancy ratio, layered flow pattern with stagnant zone for the relatively high buoyancy ratio and stagnant flow pattern for the much higher buoyancy ratio.

• 융합신호처리학회논문지
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• 제2권2호
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• pp.111-118
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• 2001

본 연구에서는 패턴 인식용 다층 퍼셉트론 신경망을 순수 디지털 논리회로 모델로 구현할 수 있도록 새로운 논리뉴런의 구조, 디지털 정형 다층논리신경망 구조, 그리고 패턴인식의 응용을 위한 다단 다층논리 신경망 구조를 제안하고, 또한 제안된 구조는 매우 단순하면서도 효과적인 증가적인 가법적(Incremental Additive) 학습알고리즘이 존재함을 보였다.

• 한국정밀공학회지
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• 제31권3호
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• pp.269-275
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• 2014

Conventional machining technologies such as a milling process have limitations in accuracy to fabricate microstructures. Deep X-ray lithography using the synchrotron radiation is a promising micromachining process with an excellent accuracy, whereas there are difficulties in the fabrication of multi-layered structures. Therefore, it is mainly used for fabricating simple mono-layered microstructures with a high aspect ratio. In this study, a novel technology for fabricating multi-layered microstructures is proposed by combining two processes. In advance, an X-ray resist material is cut and machined into various shapes and heights by the micro milling process. Subsequent X-ray irradiation process facilitates the fabrication of multi-layered microstructures. The proposed technology can overcome the limitation of the pattern accuracy in conventional milling process and the difficulty of the multi-layered machining in x-ray process. The usefulness of the proposed technology is demonstrated in this study by applying the technique in the realization of various multi-layered microstructures.

• 복식문화연구
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• 제8권6호
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• pp.940-948
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• 2000

This paper analyzed the collections of Dries Van Noten and found the influences of oriental ethnic costumes. The oriental looks which he had shown in his collections are followings : Largely, the menswear designs of Van Noten took the concept of an easy and loose style which is a common shape in oriental ethnic costumes. Especially various transformations of layered look were found in his collections. Design ideas of Van Noten's womenswear style included variations of a sarong style, a kimono style, and etc. Also in his womenswear collections, various styles of layered look were shown. He often used lustrous fabrics like satin, brocade, and damask which are driven from the oriental region. His collections had Chinese dragon-or flower-pattern, Japanese geometric pattern, and Indian henna pattern. The patterns were embroidered or gilded.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(3)
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• pp.185-188
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• 2002

This paper proposes a efficient way to use Database that is constructed about attack-pattern. For IDS that activate confrontation, we reconstruct by Layered Attack Tree after constructing attack pattern by Attack Tree. And then this paper has designed IDS that Layered Attack Tree is applied, verified them.

• 보존과학회지
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• 제35권5호
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• pp.440-452
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• 2019

전통 제철 공정 중 단야공정에서 나타나는 다층구조 무늬의 선명도를 향상시키고자 재현실험을 통해 생산된 사철강(SI)과 탄소의 함량이 다른 3종류의 현대강인 경강(HS), 고탄소강(CS), 니켈탄소강(NiS)을 각각 단접한 소재 SIHS(사철강 + 경강), SICS(사철강 + 고탄소강), SINiS(사철강 + 니켈탄소강)을 대상으로 분석하였다. 사철강과 탄소의 함량이 다른 3종류의 현대강의 접합면에 대한 미세조직 관찰 결과, SINiS의 경우 다른 소재에 비해 단접면의 단접이 잘 이루어졌고 표면무늬 또한 두드러지게 관찰되었다. 결정립 크기는 소재별 큰 차이는 없었으나 경도는 SICS가 가장 높았다. 소재별 접합면에 대한 전자빔 미세분석법 측정 결과, SINiS의 경우 니켈과 탄소가 함유되어 표면무늬의 선명도가 다른 소재에 비해 높은 것으로 관찰된다. 이상의 결과를 통해 전통단접기술의 특징인 다층구조 소재에서 표현되는 표면무늬의 선명도를 높이기 위해서는 니켈이 함유된 탄소강이 가장 적합함을 확인할 수 있었다.

• 경영과학
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• 제18권2호
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• pp.25-38
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• 2001

The well-known back-propagation algorithm for multi-layered neural network has successfully been applied to pattern c1assification problems with remarkable flexibility. Recently. the multi-layered neural network is used as a powerful data mining tool. Nevertheless, in many cases with complex boundary of classification, the successful learning is not guaranteed and the problems of long learning time and local minimum attraction restrict the field application. In this paper, an Improved learning procedure of multi-layered neural network is proposed. The procedure is based on the generalized delta rule but it is particular in the point that the architecture of network is not fixed but enlarged during learning. That is, the number of hidden nodes or hidden layers are increased to help finding the classification boundary and such procedure is controlled by entropy evaluation. The learning speed and the pattern classification performance are analyzed and compared with the back-propagation algorithm.

• 소성∙가공
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• 제31권3호
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• pp.143-150
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• 2022

The purpose of this study was to investigate an innovative hydroforming process for the cost-effective manufacturing of double layered tube with circumferentially corrugated patterns. Conventional double pipe heat exchanger has relatively poor heat transfer efficiency because of the limited contact area resulting from the concentrically arranged simple cylindrical structure. As a promising alternative to enhance heat transfer efficiency, double layered tube with corrugated internal pattern was considered in this study. To fabricate corrugated inner tube, innovative tube hydroforming system was developed. The customized loading paths were established using the simulated forming pressure and contracting stroke at various bar diameters. Experimentally obtained cross-sectional profiles were analyzed to evaluate the reliability and applicability of the hydroformed tube with various patterns. The results demonstrate that the proposed hydroforming process can be a feasible alternative for manufacturing high-performance double-tube heat exchangers.

• ETRI Journal
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• 제25권6호
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• pp.517-522
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• 2003

This investigation confirms that silver stearate consists of an infinite-sheet, two-dimensional, nonmolecular layered structure. Scanning electron microscopy, X-ray diffraction, and infrared spectroscopy reveal the following: plate-like morphology is identified from the SEM image, XRD peaks can be indexed to the (0k0) reflections of a layered structure, and infrared peaks show that alkyl chains are present in an all-trans conformational state with little or no significant gauche population. Based on these structural characteristics, we demonstrate that silver stearate, a prototype of layered organic-inorganic hybrid material, can be grown not only in a designed two-dimensional pattern but also in three-dimensionally ordered ways by using carboxyl-group terminated nanoparticles as a template.