• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2000년도 추계종합학술대회
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• pp.364-367
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• 2000

As computer system and information/communication technology develop rapidly, nowadays CSCW(Computer Supported Collaborative Work) system appears, through which it is available to work on virtual space without any restriction of time and place. Most of Un systems depend on a special network and groupware. The systems of graphics and CAD are not so many because they are characterized by Hardware and application software. In this paper, we propose a web-based collaborative CAD system which can be jointly worked on Internet WWW being independent from any platforms. It can generate and handle objects easily using lava 3D, and it can transmit, print, and store them. The interactive work for designing objects can be also carried out through dialling with each other. This system is executed in the environment of Client/server. Clients connect to the server through lava applet on WWW. The server is implemented by lava application, and it consists of three components : connection manager which controls the contact to users, work manager which keeps viewing in concurrency and provides virtual work space sharing with others, and solid modeler which generates 3D object.

• 천문학회보
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• 제37권2호
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• pp.75.1-75.1
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• 2012

Narrow-Line Seyfert 1 galaxies are arguably the most important AGN subclass in investigating the origin of the black hole mass-galaxy stellar velocity dispersion (MBH-${\sigma}$) relation because of their high accretion rates close to the Eddington limit. Currently, it is still under discussion whether NLS1s are off from the local MBH-${\sigma}$ relation. We select a sample of 325 NLS1 at relatively low redshift (z<0.1) from the SDSS DR7 by constraining FWHM of $H{\beta}$ in the range of 800-2,200 km/s. Among them, we measured stellar velocity dispersion of 40 objects which show strong stellar absorption lines, e.g. Mg b triplet(${\sim}5175{\AA}$), Fe($5270{\AA}$). In contrast, the other 285 objects show too weak stellar absorption lines to measure velocity dispersion. Using the sample of 40 objects with stellar velocity dispersion measurements, we investigate whether NLS1s follow the same MBH-${\sigma}$ relation as normal galaxies and broad line AGNs. We also test the reliability of the width of narrow lines as a surrogate of stellar velocity dispersion by comparing directly measured stellar velocity dispersion with ${\sigma}$ inferred from [O III], [N II], [S II] line widths, respectively. We will discuss the connection between AGN activity in NLS1s and galaxy evolution based on these results.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1913-1919
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• 2007

Substantive provisions of the concept of an estimation and safety of complex technical systems are envisaged. New problems are assume orientation to use of the formalized methods of an estimation of residual resources of reliability of objects, and also development of other methodological base in creation of complex technical systems that is connected with detailed elaboration of attention to a safety at all stages of creation of systems: from designing until operation. In this connection existing large objects should be provided by the developed systems of engineering monitoring and diagnostics.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2018년도 춘계학술대회
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• pp.358-359
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• 2018

이 논문에서는 opencv와 android studio를 이용하여 시각장애인이 앞에 사물이 있는지 유무를 구분해준다. 스마트폰의 카메라와 연결하여 차영상으로 움직임을 감지하면 해당 부분을 Labeling 작업을 수행하고 mean shift알고리즘을 이용하여 계속 tracking하는 작업을 수행하여 시각 장애인에게 물체가 앞에 있다는 것을 알려주는 방식의 어플리케이션을 제작하고 있다. 실시간 움직임 관측을 위하여 OpenCV 기반의 C++ 프로그램을 사용하였으며, 어플리케이션은 android studio에서 제작할 예정이다. 연구 결과 Labeling으로 움직이는 물체들을 판별하였으며, Mean-Shift 알고리즘으로 박스영역을 지정하여 물체가 움직이면 박스도 함께 이동하여 실시간으로 사물을 Tracking작업을 수행한다.

• 보존과학연구
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• 통권6호
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• pp.48-57
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• 1985

This report described the corrosion structure of excavated iron artifacts in terms of simple model based on the knowledge of the corrosion process. (Fig.1)(Table 1,2)In storing the objects, there are basically three ways in which they either break in wedges, flakes and dish-shaped flakes. Completely mineralized objects or those with only a small iron core tend to break into wedges and more solid objects either split small dish-shaped flakes or large flat ones.(Fig. 2,3,4)There are two ways, therefore, to prevent this from happening. One is to keep the artifacts rigorously dried in Silica-gel, never allowing the relative humidity to rise. This is feasible which the artifacts are in store but causes great difficulty if they are wanted for museum display. Because they still contain $ FeCl _2$ they are always at risk ; they contain the seeds of their own destruction. The other alternative is to use of washing process to dissolve out the $ FeCl _2$. In this connection, many different methods to stabilize the artifact have been employed; boiling iron in frequent changes of water, soaking in Na-sesquicarbonate solution, soaking in alkaline Na-sulphite solution. In this report, introduced the alkaline sulphite method by the N.A. North and C.Pearson.Finally, Let me extend my thanks to Ancient Monument Lab., Museum of London Conservation Lab., British Museum Conservation Div. and National Maritime Museum Conservation Lab. who have helped me and made many valuable suggestions.

• 한국멀티미디어학회논문지
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• 제21권12호
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• pp.1493-1503
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• 2018

We propose an object recognition system and experiential game contents using Kinect to maximize object recognition rate by utilizing underwater robots. we implement an ice hockey game based on object-aware interactive contents to validate the excellence of the proposed system. The object recognition system, which is a preprocessor module, is composed based on Kinect and OpenCV. Network sockets are utilized for object recognition communications between C/S. The problem of existing research, degradation of object recognition at long distance, is solved by combining the system development method suggested in the study. As a result of the performance evaluation, the underwater robot object recognized all target objects (90.49%) with 80% of accuracy from a 2m distance, revealing 42.46% of F-Measure. From a 2.5m distance, it recognized 82.87% of the target objects with 60.5% of accuracy, showing 34.96% of F-Measure. Finally, it recognized 98.50% of target objects with 59.4% of accuracy from a 3m distance, showing 37.04% of F-measure.

• 한국정보처리학회논문지
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• 제3권3호
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• pp.591-607
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• 1996

MuX서버는 다양한 멀티미디어 응용 프로그램 개발을 지원하기 위하여 멀티미디어 스트림의 생성 , 복제, 분할, 합성, 접합등의 멀티미디어 입출력을 위한 객체지향적이고 일관적인 인터페이스를 제공한다. 본 논문에서는 MuX의 요소객체를 이용하여 컴퓨터 영상회의 프로그램을 개발할 경우에 가능한 분산형과 집중형연결 구조에 대하여 지연, 동기 등 멀티미디어관련 성능에 따른 장단점을 비교 분석한다.

• 대한공간정보학회지
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• 제19권2호
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• pp.75-83
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• 2011

1995년 이후 국가지리정보구축사업의 일환으로 전국적으로 구축되었던 공간정보시스템의 통합과 연계에 대한 연구가 끊임없이 이어지고 있다. 하지만 공간정보연계와 통합을 위한 체계적인 기준이 모호할 뿐만 아니라 각각의 구축기관마다 공간정보에 대한 식별 ID가 상이하게 구축되어 있어 연계에 어려움을 주고 있는 실정이다. 본 연구에서는 국가표준의 공간정보참조체계를 기반으로 하는 UFID를 부여하기 위해 공간정보객체의 중첩방안을 제시하고 이에 대한 중첩률을 분석하고자 한다.

• 한국정보처리학회논문지
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• 제3권6호
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• pp.1515-1521
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• 1996

차세대 정보통신의 관리구조가 분산처리 환경 및 객체지향 개념을 적용하여 정립 되어 가고 있다. 본 고에서는 전달망에 대한 연결 서비스를 제공하는 연결관리 기능 에 망 간 연동을 위한 단계적 연합 기능을 설계 및 구현하고, 상이한 분산환경에서 개발된 이러한 서비스 객체 간의 상호운용성을 시험하기 위하여 유사 트레이더와 게 이트웨이 기능을 제작하였다. 이러한 기술들은 망관리가 다양한 환경에서 점차 통합 되어 가는 통신망 관리기능에 망 간 연동을 지원하는 실용적인 기술이 될 것이다.

• Journal of information and communication convergence engineering
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• 제3권2호
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• pp.93-95
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• 2005

In order to create security session, security keys are preconfigured between communication objects. For this purpose, Handshake Protocol exists. The pre-master secret key that is used in this process needs to interpreted by a server to create master secret key, whose process requires a big calculation, resulting in deteriorating system's transmission performance. Therefore, it is helpful in increasing transmission speed to reuse secret keys rather than to create them at every connection.