• 제목/요약/키워드: information mapping

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하이퍼볼릭 패턴 생성을 위한 백워드 매핑 (Backward Mapping Method for Hyperbolic Patterns)

  • 조청운
    • 한국정보과학회논문지:시스템및이론
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    • 제30권5_6호
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    • pp.213-222
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    • 2003
  • 일반적으로 하이퍼볼릭 공간상에서 대칭 패턴을 생성하는 알고리즘은 벡터표현 방식에 기반한 포워드 매핑 알고리즘을 사용한다. 기존의 알고리즘에서는 복사한 대칭 패턴을 표현하는 레이어의 증가에 따라 메모리의 사용이 기하급수적으로 증가한다 이러한 문제점으로 인해 전체 패턴의 정밀한 표현이 불가능하다. 또한 기본 패턴으로 비트맵 이미지를 사용하기 어렵고 벡터형태의 결과를 이미지로 변환하는 추가의 처리를 필요로 한다. 본 논문에서는 하이퍼볼릭 공간에서 대칭 패턴을 생성하는데 있어 정밀하고도 효율적인 계산 방법인 백워드 매핑 알고리즘을 제안한다.

Some results of the airborne imaging radar program in the Philippines

  • Vinluan, Randy John N.;Lopez, Epifanio D.;Salvador, Jerry Hervacio G.;Quiambao, Rowena B.;Lagmay, Alfredo Mahar F.;Crisostomo, Bobby A.;Hilario, Flaviana D.
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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    • pp.381-383
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    • 2003
  • SAR imagery offers a reliable mode of image acquisition over tropical countries for various applications. The Philippines participated in two missions to the Pacific Rim by NASA in 1996 and 2000 that saw the deployment of the AIRSAR instrument. This paper discusses the Philippine experience in the use of polarimetric and interferometric radar datasets for diverse applications, including hazards mapping, geologic and geomorphologic mapping, and land cover mapping. The results are discussed in the light of present efforts at capacity building in remote sensing, attempts at operationalizing the use of SAR for priority applications, and future ambitions in remote sensing.

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지하수 부존 가능지역 추출을 위한 LANDSAT TM 자료와 GIS의 통합(II) - 지하정보시스템에 의한 지하수 부존 가능성의 suitability map 작성 - (The Integration of GIS with LANDSAT TM Data for Groundwater Potential Area Mapping(II) - Suitablility Mapping for Groundwater Exploration Using the Geographic Infornation System -)

  • 지광훈
    • 대한원격탐사학회지
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    • 제8권1호
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    • pp.45-58
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    • 1992
  • The study is aimed at extraction of the groundwater potential area using the Geographic Information System. The study was to develop techniques of the thematic mapping such as slope map, geologic map, soil map and suitability mapping for grotential area. There thematic maps were combined and weightages were given to produce suitability map for groundwater potential area. The results of this study are as follows. 1) The 78% of cased wells have releation to lineament coincided with the appraisement point of the suitability map. 2) The 9 sites of 18 test sites produced over than 200 m$^3$/day. The with the highest appraisement point of the suitability map. 3) Suitability map is effective to extract groundwater potential area which can not be extracted from the remotely sensed data. The developed suitability mapping techniques are expected to do as an important tool for exploration and development of the newable and unnewable resources such as groundwater, petroleum etc.

Mobile Robot Exploration in Indoor Environment Using Topological Structure with Invisible Barcodes

  • Huh, Jin-Wook;Chung, Woong-Sik;Nam, Sang-Yep;Chung, Wan-Kyun
    • ETRI Journal
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    • 제29권2호
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    • pp.189-200
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    • 2007
  • This paper addresses the localization and navigation problem in the movement of service robots by using invisible two dimensional barcodes on the floor. Compared with other methods using natural or artificial landmarks, the proposed localization method has great advantages in cost and appearance since the location of the robot is perfectly known using the barcode information after mapping is finished. We also propose a navigation algorithm which uses a topological structure. For the topological information, we define nodes and edges which are suitable for indoor navigation, especially for large area having multiple rooms, many walls, and many static obstacles. The proposed algorithm also has the advantage that errors which occur in each node are mutually independent and can be compensated exactly after some navigation using barcodes. Simulation and experimental results were performed to verify the algorithm in the barcode environment, showing excellent performance results. After mapping, it is also possible to solve the kidnapped robot problem and to generate paths using topological information.

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DETECTING LANDSLIDE LOCATION USING KOMSAT 1AND IT'S USING LANDSLIDE-SUSCEPTIBILITY MAPPING

  • Lee, Sa-Ro;Lee, Moung-Jin
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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    • pp.840-843
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    • 2006
  • The aim of this study was to detect landslide using satellite image and apply the landslide to probabilistic landslide-susceptibility mapping at Gangneung area, Korea using a Geographic Information System (GIS). Landslide locations were identified by change detection technique of KOMSAT-1 (Korea Multipurpose Satellite) EOC (Electro Optical Camera) images and checked in field. For landslide-susceptibility mapping, maps of the topography, geology, soil, forest, lineaments, and land cover were constructed from the spatial data sets. Then, the sixteen factors that influence landslide occurrence were extracted from the database. Using the factors and detected landslide, the relationships were calculated using frequency ratio, one of the probabilistic model. Then, landslide-susceptibility map was drawn using the frequency ration and finally, the map was verified by comparing with existing landslide locations. As the verification result, the prediction accuracy showed 86.76%. The landslide-susceptibility map can be used to reduce hazards associated with landslides and to land cover planning.

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Development of a Distributed Web Caching Network through Consistent Hashing and Dynamic Load Balancing

  • Hwan Chang;Jong Ho Park;Ju Ho Park;Kil To Chong
    • 한국통신학회논문지
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    • 제27권11C호
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    • pp.1040-1045
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    • 2002
  • This paper focuses on a hash-based, distributed Wet caching network that eliminates inter-cache communication. An agent program on cache servers, a mapping program on the DNS server, and other components comprised in a distributed Web caching network were modified and developed to implement a so-called "consistent" hashing. Also, a dynamic load balancing algorithm is proposed to address the load-balancing problem that is a key performance issue on distributed architectures. This algorithm effectively balances the load among cache servers by distributing the calculated amount of mapping items that have higher popularity than others. Therefore, this developed network can resolve the imbalanced load that is caused by a variable page popularity, a non-uniform distribution of a hash-based mapping, and a variation of cache servers.

MR영상의 뇌관류 정보 Mapping을 위한 영상후처리 시스템개발 (Development of Image Post-processing System for the Cerebral Perfusion Information Mapping of MR Image)

  • 이상민;강경훈;장두봉;김광열;김영일;신태민
    • 한국정보통신학회논문지
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    • 제4권1호
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    • pp.131-138
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    • 2000
  • This paper works on development of an algorithm for mapping of cerebral perfusion parameters using the gamma-variate curve fitting. The signal intensity variate curve according to time measured in each pixel of perfusion MRI is nonlinear, and various hemodynamic parameters are not computed accurately. Levenberg-Marquardt algorithm(LMA), nonlinear optimum algorithm with high convergent speed and stability, is used to compute them. That is, the signal intensity variate curve is fitted by the gamma-variate function. Various hemodynamic parameters - Cerebral Blood Volume(C.B.V), Mean Transit Time(M.T.T), Cerebral Blood Flow(C.B.F), Time-to-Peak(T.T.P), Bolus Arrival Time(B.A.T), Maximum Slope(M.S) - are computed using LMA.

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TIN Based Geometric Correction with GCP

  • Seo, Ji-Hun;Jeong, Soo;Kim, Kyoung-Ok
    • 대한원격탐사학회지
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    • 제19권3호
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    • pp.247-253
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    • 2003
  • The mainly used technique to correct satellite images with geometric distortion is to develop a mathematical relationship between pixels on the image and corresponding points on the ground. Polynomial models with various transformations have been designed for defining the relationship between two coordinate systems. GCP based geometric correction has peformed overall plane to plane mapping. In the overall plane mapping, overall structure of a scene is considered, but local variation is discarded. The Region with highly variant height is rectified with distortion on overall plane mapping. To consider locally variable region in satellite image, TIN-based rectification on a satellite image is proposed in this paper. This paper describes the relationship between GCP distribution and rectification model through experimental result and analysis about each rectification model. We can choose a geometric correction model as the structural characteristic of a satellite image and the acquired GCP distribution.

A Compact Representation of Translation Pages for Flash Translation Layers of Solid State Drives

  • Kim, Yong-Seok
    • 한국컴퓨터정보학회논문지
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    • 제24권2호
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    • pp.1-7
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    • 2019
  • This paper presents CTP (Compact Translation Page), a compact representation of translation pages, for page mapping-based flash translation layers to improve RAM utilization and reduce the response time of solid state drives. CTP can store translation information twice in a translation page and the total number of translation pages stored in flash is reduced to half. Therefore, CTP halves the RAM size of the directory of translation pages and uses the saved RAM space for translation cache. CTP shows the best response time when compared to existing page mapping-based flash translation layers.

요구사항 데이터와 GUI 디자인 패턴 모델간의 Mapping 프로세서에 관한 연구 (A Study on Mapping Process between Requirement Data and GUI Design Patterns Model)

  • 황아영;이동현;인호
    • 한국정보처리학회:학술대회논문집
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    • 한국정보처리학회 2008년도 추계학술발표대회
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    • pp.512-515
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    • 2008
  • 웹 어플리케이션을 고객의 요구사항에 맞게 구현하기 위해서는 발주자와 수주자 간의 명확한 의사소통이 필요하다. 그러나, 잦은 요구사항의 변경과 원활하지 못한 의사소통으로 인해 요구사항의 추출 및 검증이 힘들다. 본 논문에서는 요구사항 데이터와 GUI 디자인 패턴 모델간의 Mapping 프로세스를 통해 신속하고 명확하게 고객의 요구사항을 정의하며, 프로젝트의 생산성을 높일 수 있는 방법을 제시한다.