• 제목/요약/키워드: Vector Store

검색결과 46건 처리시간 0.021초

Encryption Algorithm using Polyline Simplification for GIS Vector Map

  • Bang, N.V.;Lee, Suk-Hwan;Moon, Kwang-Seok;Kwon, Ki-Ryong
    • 한국멀티미디어학회논문지
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    • 제19권8호
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    • pp.1453-1459
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    • 2016
  • Recently, vector map has developed, used in many domains, and in most cases vector map data contains confidential information which must be kept away from unauthorized users. Moreover, the manufacturing process of a vector map is complex and the maintenance of a digital map requires substantial monetary and human resources. This paper presents the selective encryption scheme based on polyline simplification methods for GIS vector map data protection to store, transmit or distribute to authorized users. Main advantages of our algorithm are random vertices and transformation processes but it still meets requirements of security by random processes, and this algorithm can be implement to many types of vector map formats.

Selective Encryption Algorithm Based on DCT for GIS Vector Map

  • Giao, Pham Ngoc;Kwon, Gi-Chang;Lee, Suk-Hwan;Kwon, Ki-Ryong
    • 한국멀티미디어학회논문지
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    • 제17권7호
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    • pp.769-777
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    • 2014
  • With the rapid interest in Geographic Information System (GIS) contents, a large volume of valuable GIS dataset has been distributed illegally by pirates, hackers, or unauthorized users. Therefore the problem focus on how to protect the copyright of GIS vector map data for storage and transmission. At this point, GIS security techniques focusing on secure network and data encryption have been studied and developed to solve the copyright protection and illegal copy prevention for GIS digital map. But GIS vector map data is very large and current data encryption techniques often encrypt all components of data. That means we have encrypted large amount of data lead to the long encrypting time and high complexity computation. This paper presents a novel selective encryption scheme for GIS vector map data protection to store, transmit or distribute to authorized users using K-means algorithm. The proposed algorithm only encrypts a small part of data based on properties of polylines and polygons in GIS vector map but it can change whole data of GIS vector map. Experimental results verified the proposed algorithm effectively and error in decryption is approximately zero.

Selective Encryption Scheme for Vector Map Data using Chaotic Map

  • Bang, N.V.;Moon, Kwang-Seok;Lim, Sanghun;Lee, Suk-Hwan;Kwon, Ki-Ryong
    • 한국멀티미디어학회논문지
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    • 제18권7호
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    • pp.818-826
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    • 2015
  • With the rapid interest in Geographic Information System (GIS) contents, a large volume of valuable GIS dataset has been distributed illegally by pirates, hackers, or unauthorized users. Therefore the problem focus on how to protect the copyright of GIS vector map data for storage and transmission. But GIS vector map data is very large and current data encryption techniques often encrypt all components of data. That means we have encrypted large amount of data lead to the long encrypting time and high complexity computation. This paper presents the selective encryption scheme using hybrid transform for GIS vector map data protection to store, transmit or distribute to authorized users. In proposed scheme, polylines and polygons in vector map are targets of selective encryption. We select the significant objects in polyline/polygon layer, and then they are encrypted by the key sets generated by using Chaotic map before changing them in DWT, DFT domain. Experimental results verified the proposed algorithm effectively and error in decryption is approximately zero.

Design of Vector Register Architecture in DSP Processor for Efficient Multimedia Processing

  • Wu, Chou-Pin;Wu, Jen-Ming
    • JSTS:Journal of Semiconductor Technology and Science
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    • 제7권4호
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    • pp.229-234
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    • 2007
  • In this paper, we present an efficient instruction set architecture using vector register file hardware to accelerate operation of general matrix-vector operations in DSP microprocessor. The technique enables in-situ row-access as well as column access to the register files. It can reduce the number of memory access significantly. The technique is especially useful for block-based video signal processing kernels such as FFT/IFFT, DCT/IDCT, and two-dimensional filtering. We have applied the new instruction set architecture to in-loop deblocking filter processing in H.264 decoder. Performance comparisons show that the required load/store operations for the in-loop deblocking filter can be reduced about 42%. The architecture would improve the processing speed, and code density in DSP microprocessor especially for video signal processing substantially.

Ferritin Light Heavy Chain 유전자가 도입된 인삼형질전환체의 단일배발생을 통한 식물체의 기내증식 (In vitro Propagation of Transgenic Ginsengs Introduced with Ferritin Light Heavy Chain Gene through Single Embryo Culture)

  • 윤영상;김종학;김무성;양덕춘
    • 한국자원식물학회지
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    • 제17권2호
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    • pp.161-168
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    • 2004
  • Ferritin light heavy chain (FLHC) gene는 일부 중금속과 결합, 저장 및 운반하여 무독화 시킬 수 있는 것으로 알려져 있다. Fe 관련 유전자인 FLHC유전자를 식물 발현용 promoter인 35S promoter와 Tnos를 사용하여 식물 형질전환용 vector를 재조합하였다. 식물세포형질전환용 binary vector는 상기 cassette vector가 조립이 매우 양호하며 border sequence를 가지고 있는 pRD400 binary vector를 사용하여 최종적으로 가나마이신 내성 유전자 (NPT II gene)와 tadpole ferritin heavy chain gene 및 human ferritin light chain gene를 함유하고 있는 binary vector를 재조합하였다. Binary vector의 아그로박테리움에 도입은 triparental mating 방법에 의하여 수행하여 AB배지 및 가나마이신 함유 배지에서 disarmed Ti-vector를 가지고 있는 Agrobacterium tumefaciens MP90/FLHC을 선발하였다. FLHC 유전자 도입된 식물형질전환용 binary vector를 이용하여 형질전환방법을 변형하여 많은 embryo를 유도하였으며 유도된 embryo들은 GA 10mg/L가 첨가된 배지에 지상부를 유도하였다. 형질전환체식물체의 정상적인 생장을 유도하기 위해 최적의 배양조건을 조사하였던 바, 비교적 1/3 MS배지에서 뿌리의 생장과 지상부의 생장이 균일하게 생장하는 경향을 보였으며, 뿌리와 줄기가 잘 발달된 약 7cm의 유식물체를 대량으로 증식하여, 모래와 흙이 1:1로 혼합된 토양에 옮겼다.

VST 및 FPGA를 이용한 전자표적 생성 및 신호 모의장치 개발 (The Development of the Real Time Target Simulator for the RF Signal of Electronic Warfare using VST and FPGA)

  • 송상헌
    • 한국군사과학기술학회지
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    • 제26권4호
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    • pp.324-334
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    • 2023
  • In this paper, the target simulator for RF signals was developed by using VST(Vector Signal Transceiver) and set by real-time signal processing SW programs. A function to process RF signals using FPGA(Field Programmable Gate Array) board was designed. The system functions capable of data processing, raw signals monitoring, target signals(simulated range, velocity) generating and RF environments data analyzing were implemented. And the characteristics of modulated signal were analyzed in RF environment. All function of programs for processing RF signal have options to store signal data and to manage the data. The validity of the signal simulation was confirmed through verification of simulated signal results.

U-마켓에서의 사용자 정보보호를 위한 매장 추천방법 (A Store Recommendation Procedure in Ubiquitous Market for User Privacy)

  • 김재경;채경희;구자철
    • Asia pacific journal of information systems
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    • 제18권3호
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    • pp.123-145
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    • 2008
  • Recently, as the information communication technology develops, the discussion regarding the ubiquitous environment is occurring in diverse perspectives. Ubiquitous environment is an environment that could transfer data through networks regardless of the physical space, virtual space, time or location. In order to realize the ubiquitous environment, the Pervasive Sensing technology that enables the recognition of users' data without the border between physical and virtual space is required. In addition, the latest and diversified technologies such as Context-Awareness technology are necessary to construct the context around the user by sharing the data accessed through the Pervasive Sensing technology and linkage technology that is to prevent information loss through the wired, wireless networking and database. Especially, Pervasive Sensing technology is taken as an essential technology that enables user oriented services by recognizing the needs of the users even before the users inquire. There are lots of characteristics of ubiquitous environment through the technologies mentioned above such as ubiquity, abundance of data, mutuality, high information density, individualization and customization. Among them, information density directs the accessible amount and quality of the information and it is stored in bulk with ensured quality through Pervasive Sensing technology. Using this, in the companies, the personalized contents(or information) providing became possible for a target customer. Most of all, there are an increasing number of researches with respect to recommender systems that provide what customers need even when the customers do not explicitly ask something for their needs. Recommender systems are well renowned for its affirmative effect that enlarges the selling opportunities and reduces the searching cost of customers since it finds and provides information according to the customers' traits and preference in advance, in a commerce environment. Recommender systems have proved its usability through several methodologies and experiments conducted upon many different fields from the mid-1990s. Most of the researches related with the recommender systems until now take the products or information of internet or mobile context as its object, but there is not enough research concerned with recommending adequate store to customers in a ubiquitous environment. It is possible to track customers' behaviors in a ubiquitous environment, the same way it is implemented in an online market space even when customers are purchasing in an offline marketplace. Unlike existing internet space, in ubiquitous environment, the interest toward the stores is increasing that provides information according to the traffic line of the customers. In other words, the same product can be purchased in several different stores and the preferred store can be different from the customers by personal preference such as traffic line between stores, location, atmosphere, quality, and price. Krulwich(1997) has developed Lifestyle Finder which recommends a product and a store by using the demographical information and purchasing information generated in the internet commerce. Also, Fano(1998) has created a Shopper's Eye which is an information proving system. The information regarding the closest store from the customers' present location is shown when the customer has sent a to-buy list, Sadeh(2003) developed MyCampus that recommends appropriate information and a store in accordance with the schedule saved in a customers' mobile. Moreover, Keegan and O'Hare(2004) came up with EasiShop that provides the suitable tore information including price, after service, and accessibility after analyzing the to-buy list and the current location of customers. However, Krulwich(1997) does not indicate the characteristics of physical space based on the online commerce context and Keegan and O'Hare(2004) only provides information about store related to a product, while Fano(1998) does not fully consider the relationship between the preference toward the stores and the store itself. The most recent research by Sedah(2003), experimented on campus by suggesting recommender systems that reflect situation and preference information besides the characteristics of the physical space. Yet, there is a potential problem since the researches are based on location and preference information of customers which is connected to the invasion of privacy. The primary beginning point of controversy is an invasion of privacy and individual information in a ubiquitous environment according to researches conducted by Al-Muhtadi(2002), Beresford and Stajano(2003), and Ren(2006). Additionally, individuals want to be left anonymous to protect their own personal information, mentioned in Srivastava(2000). Therefore, in this paper, we suggest a methodology to recommend stores in U-market on the basis of ubiquitous environment not using personal information in order to protect individual information and privacy. The main idea behind our suggested methodology is based on Feature Matrices model (FM model, Shahabi and Banaei-Kashani, 2003) that uses clusters of customers' similar transaction data, which is similar to the Collaborative Filtering. However unlike Collaborative Filtering, this methodology overcomes the problems of personal information and privacy since it is not aware of the customer, exactly who they are, The methodology is compared with single trait model(vector model) such as visitor logs, while looking at the actual improvements of the recommendation when the context information is used. It is not easy to find real U-market data, so we experimented with factual data from a real department store with context information. The recommendation procedure of U-market proposed in this paper is divided into four major phases. First phase is collecting and preprocessing data for analysis of shopping patterns of customers. The traits of shopping patterns are expressed as feature matrices of N dimension. On second phase, the similar shopping patterns are grouped into clusters and the representative pattern of each cluster is derived. The distance between shopping patterns is calculated by Projected Pure Euclidean Distance (Shahabi and Banaei-Kashani, 2003). Third phase finds a representative pattern that is similar to a target customer, and at the same time, the shopping information of the customer is traced and saved dynamically. Fourth, the next store is recommended based on the physical distance between stores of representative patterns and the present location of target customer. In this research, we have evaluated the accuracy of recommendation method based on a factual data derived from a department store. There are technological difficulties of tracking on a real-time basis so we extracted purchasing related information and we added on context information on each transaction. As a result, recommendation based on FM model that applies purchasing and context information is more stable and accurate compared to that of vector model. Additionally, we could find more precise recommendation result as more shopping information is accumulated. Realistically, because of the limitation of ubiquitous environment realization, we were not able to reflect on all different kinds of context but more explicit analysis is expected to be attainable in the future after practical system is embodied.

Support Vector Machine을 이용한 온라인 리뷰의 용어기반 감성분류모형 (Terms Based Sentiment Classification for Online Review Using Support Vector Machine)

  • 이태원;홍태호
    • 경영정보학연구
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    • 제17권1호
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    • pp.49-64
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    • 2015
  • SNS의 확산으로 온라인 상점에서는 상품에 대한 주관적인 의견이 내포되어 있는 고객리뷰 정보가 빠르게 생성되고 확산되어 다른 고객들에게 큰 영향을 미치고 있다. 이와 더불어, 고객들의 긍정적 또는 부정적 의견을 분석하여 개선방안을 모색하려는 오피니언마이닝(opinion mining)이 주목 받고 있다. 고객리뷰에 내포된 감성정보를 가진 용어들은 감성분류를 하는데 가장 중요한 역할을 하기 때문에 영향력이 높은 용어를 선별하는 것이 가장 중요하다. 본 연구에서는 품사태깅을 이용하여 최적의 용어들을 선별하고 용어정보에 기반한 문서수준에서의 감성분류모형을 제안하고자 한다. 고객리뷰의 감성분류모형에 대표적인 기계학습기법인 SVM을 적용하고, SVM의 입력변수 선정과정에 품사태깅 방식과 용어추출기법을 다르게 조합하고 사용하여 긍정적/부정적 문서를 분류하였다. 본 연구에서 제안한 감성분류모형의 성과를 검증하기 위해 아마존(Amazon.com)의 영화와 도서에 대한 고객리뷰 80,000개를 수집하여 불필요한 용어들을 제거한 후 품사태깅을 통해 용어를 추출하였다. 추출된 용어는 문서빈도, TF-IDF, 정보획득량, 카이제곱 통계량의 값을 산출하여 값을 통해 용어들을 순위화하고, 각 상위 20개에 해당하는 최적의 용어를 선정한 후 SVM을 이용하였다. 제안된 감성분류모형을 통해 기존 연구에서 언급한 형용사만을 사용한 예측변수와 4품사를 사용한 예측변수에서의 실험결과를 통해 비교 분석하였다. 카이제곱 통계량 기반의 감성분류모형이 다른 모형보다 예측성과가 가장 우수하게 나타나는 것을 확인할 수 있었다. 본 연구에서 제안된 문서수준에서의 용어기반 감성분류모형을 이용함으로써 온라인 상점에서의 서비스 개선과 경쟁력 확보에 많은 도움이 될 것으로 기대된다.

GIS를 이용한 기저-유출 바탕의 수문모델 (Store-Release based Distributed Hydrologic Model with GIS)

  • 강광민;윤세의
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2012년도 학술발표회
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    • pp.35-35
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    • 2012
  • Most grid-based distributed hydrologic models are complex in terms of data requirements, parameter estimation and computational demand. To address these issues, a simple grid-based hydrologic model is developed in a geographic information system (GIS) environment using storage-release concept. The model is named GIS Storage Release Model (GIS-StoRM). The storage-release concept uses the travel time within each cell to compute howmuch water is stored or released to the watershed outlet at each time step. The travel time within each cell is computed by combining the kinematic wave equation with Manning's equation. The input to GIS-StoRM includes geospatial datasets such as radar rainfall data (NEXRAD), land use and digital elevation model (DEM). The structural framework for GIS-StoRM is developed by exploiting geographic features in GIS as hydrologic modeling objects, which store and process geospatial and temporal information for hydrologic modeling. Hydrologic modeling objects developed in this study handle time series, raster and vector data within GIS to: (i) exchange input-output between modeling objects, (ii) extract parameters from GIS data; and (iii) simulate hydrologic processes. Conceptual and structural framework of GIS StoRM including its application to Pleasant Creek watershed in Indiana will be presented.

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데이터 의존성과 벡터왜곡척도를 이용한 개선된 프랙탈 칼라영상 복호화 (An Improved Fractal Color Image Decoding Based on Data Dependence and Vector Distortion Measure)

  • 서호찬;정태일;류권열;권기룡;문광석
    • 한국멀티미디어학회논문지
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    • 제2권3호
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    • pp.289-296
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    • 1999
  • 본 논문에서는 데이타 의존성과 벡터왜곡척도를 이용하여 개선된 칼라영상을 복호화하였다. 프랙탈칼라영상의 복원방법은 Zhang과 Po의 벡터왜곡척도를 이용한 RGB 칼라 성분간의 상관관계를 고려하여 부호화한 압축파일을 사용하여 수렴 될 복원영상을 부호화시 만들어진 변환표의 정보를 바탕으로 참조된 정 의 역 부분이 기존의 독립적인 반복변환에 의해 수렴되었고 참조되지 않은 부분의 정의역은 데이타의존성을 갖는 영역으로 이미 수렴된 부분에 존재하므로 마지막 반복변환시 한번만에 복호화가 가능하다. 데이타의존성 부분이 차지 하는 만큼 복호화 과정에서 불필요한 계산량이 제거되었고, R영역에서 검색한 데이타 의존영역을 G,B영역에 그대로 사용하여 고속복호화가 가능하였다.

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