• Journal of IKEEE
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• v.19 no.4
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• pp.500-505
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• 2015

Through Montecarlo simulation, this study compares how accurately the existing three phase deviation models estimate the time-varying variance of a planar oscillator perturbed by Gaussian noises. The comparison reveals that Kaertner model estimates the time-varying variance with about 1000 times higher accuracy than ISF or PP model exhibits. Additionally, it finds that the estimation accuracy of PP model is somewhat higher than that of ISF model.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.7 no.1
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• pp.105-126
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• 1997

충분한 보안 메카니즘과 보안 통신 능력이 없는 지능망에서는 우연이든 고의적이든 민감한 정보에 대한 적법하지 못한 노출이나 변경이 가능성이 더 높게 존재한다. 암호화 및 복호화 알고리즘과 같은 보안 메카니즘이 존재한다는 가정하에서 이 논문은 현재의 지능망에 보안 통신 능력을 추가하기 위한 포괄적인 프레임웍을 제안하다. 이를 위해, 서비스평면(SvP: Service plane), 총괄기능평면(GFP: Global Functional Plane), 분산기능평면(DFP: Distributed Functional Plane) 및 물리평면(Physical Plane)으로 구성되는 현재의 지능망개념모델을 기본으로 의 각 평면에서 추가되어야 할 보안 통신 능력을 제시한다.

• Journal of the Earthquake Engineering Society of Korea
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• v.4 no.1
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• pp.35-50
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• 2000

본 논문에서는 반복하중을 받는 철근 콘크리트 쉘구조물의 해석을 위한 비선형 유한요소 해법을 제시하였다 유한 요소로서는 충상화기법을 이용한 부재회전강성도를 갖는 4절점 평면 쉘요소가 개발되었다 두께 방향에 대한 철근과 콘크리트의 재료성질을 고려하기 위하여 충상화기법이 도입되었다. 재료적 비선형성에 대해서는 균열콘크리트에 대한 인장, 압축, 전단모델과 콘크리트중에 있는 철근모델을 조합하여 고려하였다. 이에 대한 콘크리트의 균열모델로서는 분산균열모델을 사용하였으며 철근에 대해서는 1축 응력상태로가정하여 등가의 분산 분포된 철근량으로 모델화하였다 구성모델은 재하, 제하 그리고 재재하과정을 포함하여 요소는 반복하중하에서 철근콘크리트 쉘의 거동을 파악할 수 있다 신뢰성 있는 실험결과와 비교를 통하여 본 논문의 해석방법이 반복하중을 받는 철근콘크리트 쉘구조의 비선형 해석에 적합한 방법임을 입증하고자 한다.

• The KIPS Transactions:PartC
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• v.12C no.3 s.99
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• pp.449-456
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• 2005

Optical burst switching (OBS) overcomes the inefficient resource usage of optical circuit switching and minimizes the optical buffering requirement of optical packet switching. General switch management protocol (GSMP) is an open interface between a label switch and a controller, and it provides connection, configuration, performance, event management and synchronization. GSMP open interface in the OBS network allows the implementation of OBS switch to be simple by separating the data forward plane from the control plane. We defined managed objects to support connection, configuration, performance, and fault management for the management of OBS network in the GSMP open interface. We proposed the network management model, in which the above managed objects are distributed in a controller and an OBS switch according to network management functions. We verified the possibility of connection management using distributed network management model in the GSMP open interface of OBS network by implementing GSMP and network management functions with managed objects of OBS.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.163-164
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• 2013

최근 들어 감성공학에 관한 관심도가 증가하고 있다. 감성공학과 관련된 연구는 사람의 감정 상태를 표현하는 방법에 관한 연구가 활발히 진행되고 있다. 감정 상태를 표현하는 방법으론 1980년대 Russel이 제안한 Circumplex 모델[1]이 가장 대표적으로 사용되고 있으며, 최근에도 여러 논문[3-6]에서 이 모델을 이용하여 감정 상태를 나타낸다. 하지만 이 모델의 경우에는 사람의 감정상태를 감정차원 평면위에 하나의 점(평균, 분산)으로 표현하기 때문에, 실제 생체신호와의 연관성, 언어 및 문화 차이에 의한 다양성에 관한 연구를 진행하기에 어려움이 있다. 따라서 본 논문에서는 척도 대비 분산의 크기 값을 판단하여 하나의 점이 아닌 다수개의 점으로 나타내는 방법을 제시한다.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.40 no.4
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• pp.315-324
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• 2022

The conventional LESS (LEast-Squares Solution) is calculated under the assumption that there is no errors in independent variables. However, the coordinates of a point, either from traditional ground surveying such as slant distances, horizontal and/or vertical angles, or GNSS (Global Navigation Satellite System) positioning, cannot be determined independently (and the components are correlated each other). Therefore, the TLS (Total Least Squares) adjustment should be applied for all applications related to the coordinates. Many approaches were suggested in order to solve this problem, resulting in equivalent solutions except some restrictions. In this study, we calculated the normal vector of the 3D plane determined by the trace of the VLBI targets based on TLS within GHM (Gauss-Helmert Model). Another numerical test was conducted for the estimation of the Helmert transformation parameters. Since the errors in the horizontal components are very small compared to the radius of the circle, the final estimates are almost identical. However, the estimated variance components are significantly reduced as well as show a different characteristic depending on the target location. The Helmert transformation parameters are estimated more precisely compared to the conventional LESS case. Furthermore, the residuals can be predicted on both reference frames with much smaller magnitude (in absolute sense).

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.442-445
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• 2023

최근 딥러닝 및 로봇기술의 발전으로 인해 대량의 데이터를 빠르게 수집하고 처리하는 연구 분야들로 확대되었다. 이와 관련된 한 가지 분야로써 다중 로봇을 이용한 분산학습 연구가 있으며, 이는 단일 에이전트를 이용할 때보다 대량의 데이터를 빠르게 수집 및 처리하는데 용이하다. 본 연구에서는 기존 Distributed Neural Network Optimization (DiNNO) 알고리즘에서 제안한 정적 분산 학습방법과 달리 단계적 분산학습 방법을 새롭게 제안하였으며, 모델 성능을 향상시키기 위해 원시 변수를 근사하는 단계수를 상수로 고정하는 기존의 방식에서 통신회차가 늘어남에 따라 점진적으로 근사 횟수를 높이는 방법을 고안하여 새로운 알고리즘을 제안하였다. 기존 알고리즘과 제안된 알고리즘의 정성 및 정량적 성능 평가를 수행하기 MNIST 분류와 2 차원 평면도 지도화 실험을 수행하였으며, 그 결과 제안된 알고리즘이 기존 DiNNO 알고리즘보다 동일한 통신회차에서 높은 정확도를 보임과 함께 전역 최적점으로 빠르게 수렴하는 것을 입증하였다.

• Journal of Korea Multimedia Society
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• v.9 no.1
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• pp.89-100
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• 2006

The introduction of GSMP open interface to OBS network can materialize to separate the transport plane and the control plane in OBS network. This makes the implementation of OBS switches simple and provides various flexibility. However, the introduction of open interface will cause the connection setup delay because of the additional processing overhead of open interface protocol. Also, in GSMP based network, the location of network management functions are not defined explicitly and the research result about the OBS network management is almost nothing. This paper proposes a parallel connection setup mechanism using centralized connection control server to minimize connection setup delay in OBS network with GSMP open interface and defines managed objects to support connection, configuration, performance, and fault management for the management of OBS network with GSMP open interface. This paper also proposes a distributed network management model, in which the above managed objects are distributed in a controller and an OBS switch according to network management functions. We verify the possibility of OBS control and network management by implementing network management function using proposed parallel connection setup mechanism and distributed network management model.

• The KIPS Transactions:PartB
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• v.12B no.3 s.99
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• pp.265-272
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• 2005

In this paper, we propose a technique which is speedily searching for correspondent points of two images using Voronoi-Distance, as an image registration method for feature based image mosaics. It extracts feature points in two images by the SUSAN corner detector, and then create not only the Voronoi Surface which has distance information among the feature points in the base image using a priority based Voronoi distance algorithm but also select the model area which has the maximum variance value of coordinates of the feature points in the model image. We propose a method for searching for the correspondent points in the Voronoi surface of the base image overlapped with the model area by use of the partitive search algorithm using queues. The feature of the method is that we can rapidly search for the correspondent points between adjacent images using the new Voronoi distance algorithm which has $O(width{\times}height{\times}logN)$ time complexity and the the partitive search algerian using queues which reduces the search range by a fourth at a time.

• The KIPS Transactions:PartA
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• v.8A no.4
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• pp.489-498
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• 2001

A new method for local control of arbitrary scattered data interpolation in the hyperbolic plane is developed in this paper. The issue associated with local control is very critical in the interactive in the interactive design field. Especially the suggested method in this paper could be effectively applied to the interactive shape modeling of genus-N objects, which are constructed on the hyperbolic plane. Since the effects of the changed data affects only the limited area around itself, it is more convenient for end-users to design a genus-N object interactively. Therefore, by improving the global interpolation on the hyperbolic plane where the genus-N object is constructed, this research is aiming at the development and implementation of the local interpolation on the hyperbolic plane. It is implemented using the following process. First, for localizing the interpolating functions, the hyperbolic domain is tessellated into arbitrary triangle patches and the group of adjacent triangle patches of each data point is defined as a sub-domain. On each sub-domain, a weight function is defined. Last, by blending of three weight functions on the overlapped triangles, local MQ interpolation is completed. Consequently, it is compared with the global MQ interpolation using several sample data and functions.