• Elastomers and Composites
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• v.42 no.4
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• pp.217-223
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• 2007

Thermomechanical and shape memory properties of dicumyl peroxide(DCP) cured semicrystalline EPDM($Nordel^{(R)}$ IP) were investigated. From gel content analysis, it can be seen that Nordel can be crosslinked by small amount of DCP and the degree of crosslinking increased with the increase of DCP content. DSC analysis revealed that the melting temperature and degree of crystallinity of the crosslinked rubber decreased with the increase of DCP. Tensile test showed that tensile modulus increased and elongation at break of the rubber decreased with an increase in the degree of cross linking. The chemically crosslinked semi-crystalline EPDM exhibited excellent shape memory behavior, i.e. the sample was easily deformed to have an arbitrary secondary shape above its melting temperature and was fixed well in its deformed state when it is cooled, and then the fixed shape was recovered to its original shape very fast upon heating above its melting temperature.

• Analytical Science and Technology
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• v.20 no.6
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• pp.502-507
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• 2007

X-ray diffraction method has been widely used for qualitative and quantitative analysis of a mixture of materials since every crystalline material gives a unique X-ray diffraction pattern independently of others, with the intensity of each pattern proportional to that material's concentration in a mixture. For determination of mixing ratios, extracting source spectra correctly is important and crucial. Based on the source spectra extracted, a regression model with non-negativity constraint is applied for determining mixing ratios. In some mixtures, however, X-ray diffraction spectrum has sharp and narrow peaks, which may result in partial negative source spectrum from independent component analysis. We propose several procedures of extracting non-negative source spectra and determining mixing ratios. The proposed method is validated with experimental data on powder mixtures.

• Archives of design research
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• v.16 no.2
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• pp.131-140
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• 2003

The input for computer interaction design is very limited for the users to control the interface by only using keyboard and mouse. However, using the basic electrical engineering, the input design can be different from the existing method. Interactive art using computer technology is recently emersed, which is completed by people's participation. The electric signal transmitted in digital and analogue type from the interface controled by people to the computer can be used in multimedia interaction design. The electric circuit design will be necessary to transmit very safe electric signal from the interface. Electric switch, sensor, and camera technologies can be applied to input interface design, which would be alternative physical interaction without computer keyboard and mouse. This type of interaction design using human's body language and gesture would convey the richness of humanity.

• Journal of Intelligence and Information Systems
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• v.14 no.4
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• pp.31-46
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• 2008

A stacking yard of a container terminal is a space for temporarily storing the containers that are carried in or imported until they are carried out or exported. If the containers are stacked in an inappropriate way, the efficiency of operation at the time of loading decreases significantly due to the rehandlings. The remarshaling is the task of rearranging containers during the idle time of transfer crane for the effective loading operations. This paper proposes a method of planning for remarshaling in a yard block of an automated container terminal. Our method conducts a search in two stages. In the first stage, the target stacking configuration is determined in such a way that the throughput of loading is maximized. In the second stage, the crane schedule is determined so that the remarshaling task can be completed as fast as possible in moving the containers from the source configuration to the target configuration. Simulation experiments have been conducted to compare the efficiency of loading operations before and after remarshaling. The results show that our remarshaling plan is really effective in increasing the efficiency of loading operation.

• The Journal of the Korea Contents Association
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• v.3 no.1
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• pp.14-20
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• 2003

In this paper efficient skew estimation and correction approaches are proposed. To detect the skew of text images, Hough transform using the perpendicular angle view property and shape moments are peformed. The resultant primary text skew angle is used to align the original text. The performance evaluations of the proposed methods with respect to running time are shown.

• Journal of the Korea Computer Graphics Society
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• v.5 no.2
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• pp.1-7
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• 1999

We present an algorithm to reconstruct a pipe surface from a set of unorganized points. A pipe surface is defined by a spine curve and a radius of a swept sphere. In this paper, by using the shrinking and moving least-squares methods, a point cloud is reduced to a thin curve-like point set that can be easily approximated with a spine curve of a pipe surface. The distance between a point in the thin point cloud and a corresponding point in the original point set represents the radius of a swept sphere of a pipe surface.

• Proceedings of the Korean Information Science Society Conference
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• 2000.04b
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• pp.565-567
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• 2000

필기 한글 인식에서 원래 패턴의 모양을 유지하는 골격선 추출은 중요하다. 세선화에 의존하는 기존 방법은 작은 잡음에 민감하다는 단점을 안고 있다. 본 논문은 필기 한글 패턴에 적합한 새로운 골격선 추출 방법을 제안한다. 먼저 한글 패턴은 T-접점과 B-접점이라는 두가지 모양 특징을 중심으로 분할할 수 있다는 관찰에 근거하여 유사블록으로 이루어진 부품 집합으로 분할한다. 또한 세 개 이상의 획이 복잡한 형태로 만나는 지점을 결합 부품으로 분할한다. 그런 다음, 각 부품에서 접점의 형태에 따라 결합 부품을 추가 탐지한다. 결합 부품과 인접한 부품들의 연관 관계에 따라 골격선을 구하고, 골격선의 연결성을 보장하기 위해서 선분 연장을 수행한다. 본 논문에서 기존의 방법과의 비교를 위해 다섯 가지 비교 기준을 설정하고, 이를 기반으로 비교 분석하였다. 본 논문에서 제안한 방법이 여러 기준에서 세선화-기반 방법보다 우수함을 보였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.613-616
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• 2002

본 논문에서는 메쉬를 편집하는 편집 기술을 위해서 결과 메쉬의 질을 항상시키면서도 다양한 형태로 표현 될 수 있는 편집기를 구현하고 있다. 구현한 편집기에서는 원래 3차원 메쉬가 가지고 있는 모양을 그대로 유지하면서 매핑하기 위해 Floater가 제시한 모양 유지 매개 변수화 방법을 사용한다. 그리고 다단계 B-스플라인 함수를 이용하여 결과 메쉬에 나타날 점들의 새로운 위치를 결정하도록 하며 메쉬의 헝태를 계층적으로 제어하여 다양한 형태를 만들 수 있도록 한다.

• Journal of KIISE:Software and Applications
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• v.37 no.7
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• pp.558-567
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• 2010

There is a large body of ongoing research to develop efficient prediction methods for data streams. These methods provide single prediction with a fixed time interval. It is necessary to develop a method for multi-interval prediction (MIP) because different prediction results may be obtained based on different intervals in many cases. In this paper, we propose a solution for MIP based on the Hierarchical Temporal Memory (HTM) model. In order to solve the problem of MIP with HTM, we present an Integrated Hierarchical Temporal Memory (IHTM) network by introducing a new node type Zeta1LastNode to the original HTM network. Using the hierarchical characteristic of the IHTM network, different levels in the network learn and model the features of a data stream with different intervals and generate prediction results for different intervals. Performance evaluation shows that the IHTM is efficient in the memory and time consumption compared with the original HTM network in MIP.

• Journal of Korean Society of Environmental Engineers
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• v.22 no.10
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• pp.1809-1816
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• 2000

The catalytic combustion of methanol as a model volatile organic compound(VOC) was been investigated over metal-phthalocyanine(PC) in a fixed bed flow reactor system. The catalytic activity of Co-PC pretreated with air and methanol mixture at $450^{\circ}C$ and 60 cc/min for 1 hr was very excellent. The order of catalytic activity on methanol combustion was summarized as follows: metal free-PC < Zn-PC < Fe-PC < Cu($\alpha$)-PC < Co-PC. By TG/DTA analysis, the tendency of thermal decomposition was increased as follows: metal free-PC < Zn-PC < Cu($\alpha$)-PC < Co-PC < Fe-PC. Under this pretreatment condition, the basic structures of Co-PC, Cu($\alpha$)-PC and Fe-PC were destroyed, and the new metal oxide such as $Co_3O_4$ from Co-PC was confirmed by EA and XRD analysis. But Zn-PC and metal free-PC were retained its basic structure under this pretreatment condition. On the combustion of methanol over Co-PC, HCHO and $HCOOCH_3$ were observed as an intermediate products in the high concentration of reactant or the short contact time(W/F).