• Bulletin of the Korean Mathematical Society
• /
• v.28 no.2
• /
• pp.225-229
• /
• 1991

Our final purpose may be to introduce generalized differential forms on the space Map(S, M) of mappings from a manifold S into a manifold M and discuss the differential geometry of the space Map(S, M) from the point of the generalized forms. Here we take a subspace X of the space Map(S,M) and we introduce the generalized differential forms on X, taking the dual to the chain space with the flat norm. This method of construction allows us to discuss a sufficient condition for a subspace Y of X to admit the generalized differential forms and the natural integration as the dual operation.

• Journal of Communications and Networks
• /
• v.6 no.3
• /
• pp.209-215
• /
• 2004

In this paper, a butterfly Log-MAP decoding algorithm for turbo code is proposed. Different from the conventional turbo decoder, we derived a generalized formula to calculate the log-likelihood ratio (LLR) and drew a modified butterfly states diagram in 8-states systematic turbo coded system. By comparing the complexity of conventional implementations, the proposed algorithm can efficiently reduce both the computations and work units without bit error ratio (BER) performance degradation.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
• /
• 2010.04a
• /
• pp.381-382
• /
• 2010

The management system of next digital map will contributes the systematic management for large dataset and huge data. To develop the management system, the requirements are analyzed and applied through the analysis of characteristics of middleware management, editor and component.

• Korean Journal of Computational Design and Engineering
• /
• v.17 no.2
• /
• pp.132-139
• /
• 2012

Presented in the paper is a procedure to extract simplified triangular mesh from a height map (terrain data). The proposed algorithm works directly on a height map that extracts a simplified triangular mesh. For the simplification, the paper employs an iterative method of edge contractions. To determine an edge to be contracted, the contraction cost of an edge is evaluated through the QEM method. Normally, an edge contraction will remove two triangles sharing the edge. Although the edge contraction can be implemented easily on a triangular mesh, it is not viable to implement the operation on a height map due to the irregular topology. To handle the irregular topology during the simplification procedure, a new algorithm is introduced.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2009.01a
• /
• pp.173-176
• /
• 2009

본 논문에서는 피부색 정보와 눈, 입의 위치를 찾아 실시간으로 얼굴을 인식하는 랩을 제안한다. 먼저 노이즈를 제거하여 얼굴 후보 영역을 지정한다. 지정된 얼굴 후보 영역에서 눈과 입을 찾고, 찾은 눈과 입 사이의 영역에서 에지를 탐색하여 코의 존재 유무를 검증하고 이를 바탕으로 얼굴인지 판단하는 절차를 따른다. 제안한 기법은 피부색 검출을 위해 YCbCr 을 이용하여 피부 영역을 찾고 지정한 피부 영역에서 노이즈를 제거한 후, Eye Map의 EyeMapC 연산을 통해 눈을 Lip Map을 통해 입을 찾는다. 찾아낸 눈과 입의 사이의 영역에서 Canny Edge 연산을 수행하여 코의 존재 유무를 판단하여 최종적인 얼굴 영역을 판별하는 방법을 제안한다.

• Journal of the Korean Mathematical Society
• /
• v.54 no.2
• /
• pp.381-397
• /
• 2017

In this paper, we study surfaces in 3-dimensional Minkowski space in terms of certain type of their Gauss map. We give several results on these surfaces whose Gauss map G satisfies ${\square}G=f(G+C)$ for a smooth function f and a constant vector C, where ${\square}$ denotes the ChengYau operator. In particular, we obtain classification theorems on the rotational surfaces in ${\mathbb{E}}^3_1$ with space-like axis of rotation in terms of type of their Gauss map concerning the Cheng-Yau operator.

• Proceedings of the KAIS Fall Conference
• /
• 2012.05b
• /
• pp.527-530
• /
• 2012

본 논문은 윤곽선이 두드러지는 Saliency Map모델을 생성하고 객체 후보 영상을 획득하여 객체를 추출할 수 있는 기법에 관한 연구이다. 제안하는 기법은 객체의 윤곽선 정보가 두드러지는 Saliency Map을 생성하기 위해 에지(Edge), 초점(Focus), 엔트로피(Entropy)를 특징 정보로써 사용하고, 획득한 Saliency Map의 임계화 과정 및 라벨링 과정을 통해 배경 영역을 제거한 객체 후보 영상을 획득한다. 이후 Mean Shift Segmentation 알고리즘을 적용한 영상의 세그먼트별 객체 후보 영상의 픽셀 평균값을 적용한 영상을 다시 라벨링 과정을 이용하여 객체를 추출한다.

• Transactions on Control, Automation and Systems Engineering
• /
• v.1 no.1
• /
• pp.62-68
• /
• 1999

FCM(Fuzzy Cognitive Map) is proposed for representing causal reasoning. Its structure allows systematic causal reasoning through a forward inference. Authors have already proposed a diagnostic system based on FCM to utilized to identify the true origin of fault by on-line pattern diagnosis. In FCM based fault diagnosis, Temporal Associative Memories (TAM) recall of FCM is utilized to identify the true origin of fault by on-line pattern match where predicted pattern sequences obtained from TAM recall of fault FCM models are compared with actually observed ones. In engineering processes, the propagation delays are induced by the dynamics of processes and may vary with variables involved. However, disregarding such propagation delays in FCM-based fault diagnosis may lead to erroneous diagnostic results. To solve the problem, a concept of FTCM(Fuzzy Time Cognitive Map) is introduced into FCM-based fault diagnosis in this work. Expecially, translation method of FTCM makes it possible to diagnose the fault for some discrete time. Simulation studies through two-tank system is carried out to verify the effectiveness of the proposed diagnostic scheme.

• Proceedings of the KSRS Conference
• /
• 2008.10a
• /
• pp.262-265
• /
• 2008

We design level 1 traffic thematic map for common data structure. Level 1 means the road that can passing cars. If public office and private company use this form, they can save amount of money from overlapping update. And widely use of traffic analysis, navigation and traffic information system. For design common data structure we compared several data structure(traffic thematic map, ITS standard node/link, Car navigation map), and generalization these characteristic data. After generalization we considered about application parts. It can use of public part(traffic analysis, road management, accident management) and private part(car navigation, map product, marketing by variable analysis) etc.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2016.10a
• /
• pp.404-405
• /
• 2016

본 논문은 자율주행로봇의 평면 공간 주행과 평면 공간상의 Map 정보를 생성하는 것에 관한 것이다. 자율주행 로봇은 Raspberry Pi, Sonar Sensor, Gyro Sensor를 사용해 궤적 이동에 대한 정보를 수집한다. 자율주행로봇은 정확한 직진 주행 및 회전 이동을 위해 개선된 모터 제어 기법인 PID Controller를 사용한다. 정확한 Map 정보를 생성하기 위해서 System은 주행 중에 수집한 궤도의 정보를 2차원 배열과 LIFO 자료 구조에 기록하여 Map Information을 생성해 나간다.