• Review of KIISC
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• v.4 no.1
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• pp.44-52
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• 1994

정보화 사회에서는 가계, 기업, 정보 등의 정보 활동의 주체들이 가진 정보자산은 데이타 베이스(이하DB)와 소프트웨어(S/W)로 대변할 수 있으며, 이중 DB는 정보화 사회의 기반시설의 하나라고 볼 수 있다. 특별히 통계DB는 각 주체들에게는 필수적인 정보를 갖고 있다. 금융자산의 정보, 국방에 관련된 병력, 장비, 군수물자등의 정보, 회계정보 뿐 아니라 인구센서스, 경제계획수립 등등의 다양한 분야에 이 통계 DB는 사용되고 있다. 이러한 통계DB는 기존의DB에서의 데이타의 저장, 관리, 추출 기능외에 통계적인 데이타의 분석기능이 요구되고 있다. 통계 처리를 위한 데이타베이스관리 시스템(DBMS, database management system)은 주로 기존의 DBMS 에 통계처리를 위한 기능을 추가하거나 통계를 위한 DB를 따로 구축하는 방법을 사용하고 있다. 따라서 일반적인 DB 보호 기술과 더불어 통계 의 환경을 이해하는 보호 기술이 요구되고 있다. 일반적으로 DB 를 보호하는 방법으로는 물리적인 보안(physical security)과 운영체계 보안(operating system security) 이 있으며, 이들과 함께 데이타 암호화(data encryption)의 방법을 사용하고 있다. DB 의 보안 방법에 관한 연구 중 George I. Davida 등에 의한 방법은 중국인의 나머지 정리(chinese remainder thorem)를 사용하는 암호화 알고리즘을 이용하여 레코드(record) 단위의 암호화를 하며, Khamis A. Omar등에 의한 방법은 읽기, 쓰기, 갱신의 3단계의 사용자 등급을 부여하여 DB 접근의 제약을 가하는 기능을 갖고 있다. 본고에서는 특히 그 중요성이 더해가고 있는 통계 의 일반적인 개념을 살펴보며, 특성 지향형 질의 모델(characteristic-specified query model)의 보호기술을 살펴본다. 특별히 본고는 통계 DB의 보호에 대한 일반적인 조사 연구로서 잘 알려진 사실들을 많은 참고 문헌과 더불어 소개하는 내용으로 통계 DB의 보호에 관한 새로운 연구 결과는 아니다.

• Journal of Korea Spatial Information System Society
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• v.2 no.1 s.3
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• pp.91-107
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• 2000

Geographic Information Systems(GISs) generally use a very large amount of spatial data. and are implemented on various software and hardware system. If it is impossible to exchange the spatial data efficiently among the different hardware, software, and operation systems, data sharing will be very difficult and duplicated storage & management of the spatial data will result in a great economic loss. To solve such problems, a national organization established a national standard for GIS and constructed spatial databases at the national level. In Korea, SDTS(Spatial Data Transfer Standard) is selected as a national standard for the common data transfer format. In this paper, we design and implement a SDTS Data Management System which can support display, insertion, update, deletion of SDTS data, extraction and creation of a specified area, error checking and reporting, setting and verification of a SDTS profile through the GUI (Graphic User Interface) environment. Hereafter, as GIS industry is continually activated and a demand for the SDTS data increases, a requirement for analysis and trust of the SDTS data will grow bigger, so the necessity of the SDTS Data Management System developed in this paper will also grow rapidly.

• Journal of Korean Society for Geospatial Information Science
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• v.20 no.1
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• pp.83-91
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• 2012

Crown density, which is defined as the proportion of the forest floor concealed by tree crown, is important and useful information in various fields. Previous methods of measuring crown density have estimated crown density by interpreting aerial photographs or through a ground survey. These are time-consuming, labor-intensive, expensive and inconsistent approaches, as they involve a great deal of subjectivity and rely on the experience of the interpreter. In this study, the crown density of a forest in Korea was estimated using KOMPSAT-2 high-resolution satellite images. Using the image segmentation technique and stand information of the digital forest map, the forest area was divided into zones. The crown density for each segment was determined using the discriminant analysis method and the forest ratio method. The results showed that the accuracy of the discriminant analysis method was about 60%, while the accuracy of the forest ratio method was about 85%. The probability of extraction of candidate to update was verified by comparing the result with the digital forest map.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.11
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• pp.303-309
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• 2018

Internet of Things technology is an intelligent service that connects all objects to the Internet and interacts with them. It is a technology that can be used in various fields, such as device management, process management, monitoring of restricted areas for industrial systems, as well as for navigation in military theaters of operation. However, because all devices are connected to the Internet, various attacks using security vulnerabilities can cause a variety of damage, such as economic loss, personal information leaks, and risks to life from vulnerability attacks against medical services or for military purposes. Therefore, in this paper, a mutual authentication method and a key-generation and update system are applied by applying S/Key technology based on a hash chain in the communications process. A mutual authentication method is studied, which can cope with various security threats. The proposed protocol can be applied to inter-peer security communications, and we confirm it is robust against replay attacks and man-in-the-middle attacks, providing data integrity against well-known attacks in the IoT environment.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.23 no.1
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• pp.89-96
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• 2005

With acquisition of satellite image being facilitated due to recent advancement in Electro optical and astronautic technologies, focus on establishment of Geoinformation and analysis using satellite images have increased. This research have conducted digital plotting and digitizing operation, utilizing stereo images and grey level images provided by SPOT5 satellite and evaluated the accuracy through comparison and analysis with digital map results. Digital plotting results acquired using stereo images have been compared and analyzed on the basis of scale 1:25,000 digital map results published by National Geographic Information Institute. Accuracy of 20 check points have showed RMSE results 5.369 m at X (Easting) and 4.718 m, digitizing using grey level images showed RMSE results 7.616 m in X (Easting) and Y (Northing) 6.532 m. This is within the allowance of accuracy standards for scale 1:25,000 maps, and although digitizing operation was confirmed to have lower accuracy than that of digital plotting, using the former is considered to be more effective in terms of economical efficiency.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.25 no.4
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• pp.355-363
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• 2007

The purpose of this study is to maximize the use of framework data by a method for updating road framework data using a economical, rapid, and accurate Vehicle-based kinematic survey to get the latest road data among "transportation framework data" which was built in 2003. We collected data using a Vehicle-based kinematic survey with DGPS (Differential Global Positioning System) in Daejeon and Pyeongtaek city and verified the accuracy of line and point features between surveying and previous results. The result showed that Daejeon city which is located near GPS CORS (Continuously Operating Reference Station)s and receive a signal well had lower errors than 1/5,000 digital base map, and Pyeongtaek city which is located far from the stations and receive a signal badly had errors beyond the limits. The study showed that postprocessing method or Total Station surveying should be used where signals cannot be detected well after analyzing a receiving rate from GPS CORSs, the stations of other organizations should be shared, and further studies are needed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.5
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• pp.458-465
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• 2020

The purpose of this study is to analyze the effect of policy in Jeju, using a macro-economic forecasting model of Jeju. First, the model's reality explanatory power improved by updating its statistics to 2017 and expanding new policy variables and modules. Also, the industrial structure of the model was further subdivided and extended to be considered simultaneously in the demand side of Keynesian theory. Second, it was determined that the predictive power for the model of this study was better than that of the existing model. However, with some endogenous variables, it was possible to identify implications that should be developed and considered when the model is improved with additional data in the future. Third, when the second airport construction was considered, it was observed that its effect was an increase of 1.25 times for GRDP, 1.2 times for employment, 1.48 times for private consumption, and 2.06 times for investment. Also, the economic growth rate was estimated to be 1.6% point higher than when the second airport was not constructed. Finally, the results of this study are expected to be used for policy decision making of the Jeju Government.

• Journal of Agricultural Extension & Community Development
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• v.13 no.1
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• pp.227-234
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• 2006

산림관리에 있어 공동체는 중심에서 풀-뿌리단계로 관심을 받아왔다. 베트남에서, 공유림은 오랜 기간 산림에 의존하고 있는 서로 다른 공동체의 존재 그리고 종교와 긴밀히 연결되어 있다. 지난 몇 년 동안, 지속가능한 산림경영의 필요성에 기초하여, 몇몇 지역 공동체는 산림 또는 임지를 마을과 가구를 포함하여 산림에 대해 소유권을 가진 지역공동체에 할당되었다. 게다가 공동체는 또한 산림을 보호, 천연갱신과 신규조림 등 정부기구의 프로그램에 참여하였다. 산림관리에 근거한 지역공동체의 경험은 경제-사회적으로 적합한 산림관리 모델로 이것은 베트남의 서로 다른 민족의 전통관습에 따른다. 그러나 법적인 면에서, 지역공동체는 아직 산림 또는 임지에 연결된 실체로 인식되지 않고 있다. 공동체 산림관리의 두가지 형태는 (i) 그들에게 속한 산림과 임지를 공동체가 직접 관리하는 경우와 (ii) 공동체가 국가기관이 소유한 산림의 보호와 조림에 참여하는 경우이다. 이 논문은 공동체 산림관리에 대한 현재의 상황, 잠재력, 경향 및 이슈를 명확히 하여 정책담당자의 이러한 산림관리에 대한 이해를 돕는 데 있다.

• Journal of Digital Convergence
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• v.19 no.3
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• pp.65-79
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• 2021

The purpose of this study was to research how emotional factors affect decision-making on the maintenance and abandonment of a patent, and to present new criteria for patent policies. The types of Korean patent abandonment were analyzed according to the patent holding period, and a questionnaire survey was carried out to verify whether there are differences among patentees in terms of sunk cost bias, endowment effect, and coupling or not. Individuals and small and medium-sized enterprises showed relatively greater emotional bias toward sunk cost and endowment effect than large companies, and the sunk cost effect decreased as decision-making experience increased. In addition, the reduction in the payment cycle of the patent renewal fee has a positive effect on the increase in the willingness to use the patent right, and the individuals and small and medium-sized enterprises has a greater synergistic effect than the case of large companies, in particular. This study are expected to play a part in establishing policies to minimize wasteful factors of patent assets based on the propensity of the patentees.

• Korean Journal of Plant Resources
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• v.9 no.2
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• pp.151-155
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• 1996

For improvement germination rate of Cirsium setidens, wet seeds were storaged for 20 to 80 days at $4^{\circ}C$ and germinated at $18^{\circ}C$ in the dark or light condition. To assess the effects of shading and plant age on the growth, fresh yield and seed yield under rain shelter in highland at altitude of 800m above sea level, seeds were sown in an open field in late september,1990. In early May the next the seedlings were transplanted for vegetatable and seed production in the plastic houses for rain shelter. They were grown from 1991 to 1993 in the houses covered with the shading nets ranging from 0 to 70% for vegetable production and 0 to 50% for seed production. Germination rate inceased as the storage period lengthened, and the rate came to $60\sim80%$ at 60days after germination. It was more effective in lighting than in darkness. For vegetable production, the shading net treatments showed more values in almost the characters checked at the third year than the non-shading treatment. No. of stem, no, of leaves, stem length and degree of softening were no different between shading net treatments, but the other characters were significantly different. Ratio of survival, density of chlorophyll and ratio of dry matter of plants were highest in the plots of 50%, 70%, and 30% of shading, respectively. The highest fresh yield was recorded from 2-year plants, 70% of shading from them showed the greatest yield. The highest seed yields were produced 2-year-old plants of non-shading plot. For seed production, the non-shading treatment is best, and the highest seed yields were obtained in both the second and third years.