• Proceedings of the Korean Society of Computer Information Conference
• /
• 2016.07a
• /
• pp.195-197
• /
• 2016

시멘틱웹을 구축하는 표준언어인 RDF (Resource Description Framework)는 언어의 그래프 기반 특성으로 인해 일반적인 방식들로는 효과적인 저장과 추출이 어렵다. 더욱이 대용량 RDF 데이터의 저장과 추출에는 성능문제가 더욱 커지므로 많은 연구들이 이루어지고 있다. 본 논문에서는 SPARQL을 지원하면서 RDF 파일들을 효과적으로 저장하고 검색할 수 있는 저장방식에 대해 연구한 결과를 제시한다. RDF 데이터를 전처리를 통해 RDF의 트리플(주어:subject, 술어:property, 목적어:Object)에서 중복되는 주어(S)나 목적어(O)를 묶고, 사용자가 SPARQL 형식으로 검색했을 때 이용자가 주어부분을 변수로 두었는지 아니면 서술어 부분을 변수로 두어 찾는지에 따라 검색어와 유사한 단어 클러스터를 찾아준다. 동일 단어에 대해 여러 번 검색되던 부분을 한 번 검색으로 처리할 수 있기 때문에 효율이 높아진다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2008.11a
• /
• pp.255-257
• /
• 2008

본 논문에서는 최근 IT 기술의 발전에 따라 무수히 양산되고 있는 멀티미디어 데이터를 효율적으로 검색하기 위한 방법을 제안한다. 영상 검색 시스템에 사용되는 데이터베이스(DB) 영상들에 존재하는 각 객체들의 존재 영역을 기반으로 질의 영상 (query image)의 객체 영역을 추정해서 검색에 활용하는 것이다. 이는 질의 영상의 전체 영역으로부터 객체를 추정하는 것보다 데이터베이스 영상들로부터 추출한 통계적 객체 분포 범위를 기반으로 추정하기 때문에 빨리 객체 추출이 가능하도록 한다. 따라서 객체를 추출하기 위한 배경 지식이나, 사용자 입력이 전혀 필요 없다. 이렇게 추출된 객체 영역의 영상들로부터 GLCM 알고리즘을 이용해서 객체 영역의 특성이 잘 반영된 질감 특징 값을 바탕으로 검색에 활용 할 경우 원본 영상의 질감 특징을 활용한 경우보다, 객체의 질감 특징을 더 잘 반영한다는 것을 실험을 통해 확인할 수 있었다.

• Proceedings of the IEEK Conference
• /
• 2000.09a
• /
• pp.371-374
• /
• 2000

We propose an efficient method for content-based ultrasound image retrieval using magnitude frequency spectra and implement a retrieval system based on the proposed method. The target images are ultrasound images of adult organs. Trained users often acquire such images so that images of the same kind of organs are very similar, although their locations may not exactly coincide. Therefore, the magnitude frequency spectrum, which has a translation-invariant property, is used as a feature. All the object images in the image DB is pre-classified in the same kind organs. Experimental results show that the proposed method is superior to some well-known conventional methods.

• Journal of applied mathematics & informatics
• /
• v.31 no.5_6
• /
• pp.825-834
• /
• 2013

In this paper, we study the Yeh convolution of white noise functionals. We first introduce the notion of Yeh convolution of test white noise functionals and prove a dual property of the Yeh convolution. By applying the dual object of the Yeh convolution, we study the Yeh convolution of generalized white noise functionals, which is a non-trivial extension. Finally, we study relations between the Yeh convolution and Fourier-Gauss, Fourier-Mehler transform.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.10 no.1
• /
• pp.38-46
• /
• 2011

A study was performed to investigate the dynamic behaviors of fiber-reinforced composite materials subjected to transversely low-velocity impact. For this purpose, the simulation of modified beam finite element based on higher order beam theory for two(isotropic and anisotropic) materials is carried out according to the changes of material property, stacking sequence, geometric dimension and impact velocity of steel ball, etc. Main composite materials for simulation are composed of $[0^{\circ}/90^{\circ}/0^{\circ}/-90^{\circ}/0^{\circ}]_{2s}$, $[0^{\circ}/90^{\circ}/0^{\circ}/-90^{\circ}/0^{\circ}]_s$ and $[0^{\circ}/45^{\circ}/0^{\circ}/-45^{\circ}/0^{\circ}]_{2s}$, $[0^{\circ}/45^{\circ}/0^{\circ}/-45^{\circ}/0^{\circ}]_s$ stacking sequences. The effectiveness of this simulation for qualitative and quantitative evaluations in composite materials subjected to foreign object impact was established.

• Proceedings of the Korea Society for Industrial Systems Conference
• /
• 1998.10a
• /
• pp.655-662
• /
• 1998

This paper is on the anlaysis for real-time software requirement . This method can be used for TNPIN(Timed Numerical Petri Net) as a easy communication means with a real-users. It is based on the RTTL(Real Time Temporal Logic) for correctness fo the system. TNPN is used to represent a behavior specification language, the validity of specified behaviors in TNPN is expressed in RTTL , and analyzed through the reachability graph. Thus , the requirement of between user and system is satisfied. By the example of shared track, the validity of the property of real-time (safetiness, responsiveness, liveness, priority) is verified. Also, this framework is give to connection with a object natually.

• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 2003.05a
• /
• pp.199-203
• /
• 2003

Idler of excavator are large product with diameter 500 - 600 mm and parts of a power transmit device. The object of the paper is developed large products by hot closed-die forging. The forging process which is proposed from numerical analysis and various tests is developed a large products with good quality. To estimate the design process parameters such as working load, temperature and flash thickness so on, numerical analysis are used by DEFORM 2D. To obtain a flow stress data and optimal forging temperature is carried out hot compression and tensile test at a various temperature range. Developed product is tested mechanical properties of elongation, hardness and tensile strength so on. Test results are presented excellent mechanical properties.

• Journal of Korea Game Society
• /
• v.5 no.1
• /
• pp.19-24
• /
• 2005

To get the realistic deformation of fractal objects in computer games, fractal-like deformation property should be added to ordinary continuous deformations. We, here, suggest a fractal-like vector fields producing method using the code and its modification, and some examples are given.

• Journal of Applied Tourism Food and Beverage Management and Research
• /
• v.7
• /
• pp.7-39
• /
• 1997

Many of legislations related to tourism has been made up to now since the year 1961 when modern tourism studies started. In restropect of the year 1988, the year 2002 is expected to be another chance for tourism. In order to take this chance again, new laws and regulations are necessary. Therefore, the object of this study are decided as follows: 1) to put 'the right to go sightseeing' in statutory form at constitution. 2) to realise the private law of tourism 3) to make the environment law of tourism 4) to make the facility law of tourism 5) to make the transportation law of tourism 6) to make the cultural property law of tourism 7) to make the food law of tourism 8) to make the related law of tourism 9) to make the advertising law of tourism, the tax law of tourism, and the economy law of tourism As tourism laws like above exist, tourism industry would be developed more than now.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.9 no.6
• /
• pp.59-65
• /
• 2010

This study deals with the characteristic of refrigerant for heat-treatment deformation control of SCM415 steel. The control of heat-treatment deformation must need the progress of production parts for an industry machine. Most of the deformation is occurred on unequal cooling. The unequal cooling is occurred by a property of quenching refrigeration. When a heated metal is deposited in the refrigeration, the cooling speed is so slow in early period of cooling because of occurring a steam-curtain. After more cooling, the steam-curtain is destroyed. In this progress, the cooling speed is very fast. The object of this study is to control the deformation of heat-treatment for the part of the industry machine by improving the conditions of quenching. The cooling curves and cooling rates of water, oil and polymer solution are obtained and illustrated. From the characteristics of the quenching refrigerant, the effects of heat-treatments on the thermal deformation and fatigue strength are also investigated.