• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2012년도 추계학술발표대회
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• pp.111-114
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• 2012

R&D에서 IPR(Intellectual Property Right)의 비중이 점차 늘어가는 시점에서 특허를 이해하고 이용할 수 있는 능력의 배양은 무엇보다 중요하다. 컴퓨터 사이언스 분야에서 차후 유망한 기술 중 하나로 대두되는 클라우드 컴퓨팅(Cloud Computing)에 관한 주요 기술들의 특허 지도를 작성해봄으로서 해당 기술의 현재 특허 상황을 알아보고 향후 대책을 모색한다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2013년도 추계학술발표대회
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• pp.1457-1460
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• 2013

We propose a flexible camera calibration system for mobile platform to calibrate the camera's intrinsic parameters which based on the geometrical property of the vanishing points determined by two perpendicular groups of parallel lines. The system only requires the camera to observe a rectangle card show at a few(at least four)different orientation. The experimental results of the real images show the proposed calibration system in this paper is easy to use and robust.

• 한국결정성장학회지
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• 제18권3호
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• pp.131-135
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• 2008

본 연구에서는 합성운모에 대한 코팅기술을 확립한 뒤, 비수성을 나타내는 합성운모를 제조하였다. 합성운모의 표면코팅은 고속교반기를 사용하여 행하였으며, 스테아린산으로 코팅된 합성운모의 특성은 침적실험, XRD 및 SEM을 이용하여 분석하였다. 본 연구 결과, 교반기의 내부온도는 $70^{\circ}C$를 유지하고, 10분 동안 1600 rpm/min을 행함으로써 운모 표면에 스테아린산의 코팅이 가능하였다. 또한 SEM 관찰결과로부터, 스테아린산과 운모의 혼합비율, 교반기 내부온도, 회전속도에 의해 특성이 변화하는 반면 코팅처리시간과는 무관함을 알 수 있었다.

• 한국컴퓨터정보학회논문지
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• 제20권9호
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• pp.137-145
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• 2015

The Criminal Law of South Korea has needed to cope with new kinds of crimes such as the fraud by use of computer efficiently in a legislative way because the society has witnessed the rapid progress of the industrialization and informatization after established in 1953. As a result, the Criminal Law revised on December 29, 1995, created the regulations of the crimes related to fraud by use of computer, work disturbance, and secret piracy by using information processing units. The regulation stipulated in Clause 347, Article 2 of Criminal Law is the most typical one against the new crimes. However, the new regulation of fraud by use of computer, established and revised to supplement the lacking parts of the current rules of the punishment of fraud, limits its object to "any benefits to property." not to "property" itself, and so cannot achieve the purpose of the revision of the law. This paper aims to suggest a new legislative measure about the object of the regulation of fraud by use of computer to solve this kind of problem efficiently.

• Journal of Biosystems Engineering
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• 제21권3호
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• pp.315-324
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• 1996

This study was one of a series of studies on application of machine vision and image processing to extract the geometrical features of plants and to analyze plant growth. Several algorithms were developed to measure morphological properties of plants and describing the growth development of in-situ lettuce(Lactuca sativa L.). Canopy, centroid, leaf density and fractal dimension of plant were measured from a top viewed binary image. It was capable of identifying plants by a thinning top viewed image. Overlapping the thinning side viewed image with a side viewed binary image of plant was very effective to auto-detect meaningful nodes associated with canopy components such as stem, branch, petiole and leaf. And, plant height, stem diameter, number and angle of branches, and internode length and so on were analyzed by using meaningful nodes extracted from overlapped side viewed images. Canopy, leaf density and fractal dimension showed high relation with fresh weight or growth pattern of in-situ lettuces. It was concluded that machine vision system and image processing techniques are very useful in extracting geometrical features and monitoring plant growth, although interactive methods, for some applications, were required.

• Korea-Australia Rheology Journal
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• 제19권3호
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• pp.133-139
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• 2007

Low density polyethylene nanocomposites were prepared by melt intercalating maleic anhydride grafted polyethylene and montmorillonite clay. It has been found that maleic anhydride has promoted strong interactions between polyethylene and montmorillonite, leading to the homogeneous dispersion of clay layers. Rheological experiments revealed that prepared nanocomposites exhibited shear thinning behaviour. Polyethylene nanocomposites exhibited an increase in steady shear viscosities compared to virgin polyethylene owing to strong polymer clay interactions. The tensile strength of nanocomposites was improved but elongation at break decreased considerably. Also, barrier properties improved significantly with montmorillonite content.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2005년도 춘계학술발표대회 개요집
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• pp.384-386
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• 2005

Initial oxide layer on the butt surface fragments during friction stir welding (FSW) and then often remains as a faint zigzag-line pattern on the cross section. When remnant of the oxide layer often adversely affects the mechanical properties in the weld, it is called as 'kissing-bond'. The present study systematically examines effect of oxide array on bend property in the root of friction stir (FS) welded Al alloy 1050 by transmission electron microscopy (TEM), and then clarifies identity of the kissing-bond.

• 방송공학회논문지
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• 제16권2호
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• pp.293-304
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• 2011

본 논문에서는 H.264/AVC 인코더에서 가장 많은 연산 시간이 소요되는 움직임 추정(motion estimation, ME) 동작을 위한 하드웨어의 구조를 제안하고 IP(intellectual property) 형태로 구현하였다. 고속 움직임 추정기의 구조는 버퍼(buffer), PU 어레이(processing unit array), SAD 선택기(SAD selector), MV 생성기(motion vector generator) 등으로 구성되어 있다. PU 어레이는 16개의 PU로 구성되어 있고, 각각의 PU는 16개의 PE(processing element)로 이루어져 있다. 제안한 하드웨어의 동작적인 특징은 외부메모리 접근량을 줄이기 위해 현재와 참조프레임의 데이터를 재사용한다는 것과 SAD연산을 수행할 때 클록의 손실 없이 계산을 할 수 있다는 것이다. 구현한 고속 움직임 추정기는 Altera 사의 FPGA인 StatixIII EP3SE80F1152C2에서 3%의 자원을 사용하였고, 최대 동작주파수는 446.43MHz이었다. 따라서 구현한 하드웨어는 1080p 영상을 최대 50fps로 처리할 수 있다.

• 소성∙가공
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• 제29권5호
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• pp.257-264
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• 2020

This paper is concerned with the influence of the plastic property of the rivet on the numerical prediction of the Self-Piercing Rivet (SPR) Joining. In order to predict the plastic property of the rivet, a ring compression specimen was directly fabricated from the rivet used for the mechanical joining of dissimilar materials, and the FE analysis together with the ring compression test was iteratively carried out by changing the plastic property of the rivet. For reliable FE analysis, a friction coefficient was estimated based on a friction calibration curve, measuring the reductions in inner diameter and height of the ring specimen after the compression test. From each simulation result, the force-displacement curves were then compared from each other so as to obtain the rivet plastic property that shows good agreement with the experimental result. The SPR joining between GA590 1.0t and Al5052 2.0t was conducted, and the numerical prediction was performed with the use of the plastic property evaluated based on the inverse analysis and the one referred from Mori et al. [11]. Comparison of the experiment and the numerical predictions in terms of the interlock and bottom thickness revealed that the reliable evaluation of the plastic property of the rivet is necessary for the trustworthy numerical prediction of the SPR joining.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.773-774
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• 2011