• The Korean Journal of Applied Statistics
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• v.7 no.1
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• pp.47-58
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• 1994

The farm population survey and the livestock survey are sample surveys related to agriculture. Two new sample designs for these surveys are considered. Shi-Gun(county) estimates in the farm population survey and Shi-Do(county) estimates in the livestock survey can be obtained. Also the sample sizes are reduced. To increase the precision of the estiamtes strarified simple random samples are used and particularly purposive samples are introduced in livestock survey. Lastly the method of management and replacement of samples are investigated for successive occasion survey.

• Journal of the Society of Disaster Information
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• v.17 no.1
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• pp.97-111
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• 2021

Purpose: It is expected that various infrastructures diagnosis equipment will be needed as infrastructures management is strengthened to implement the Framework Act on Sustainable Infrastructure Management. It is necessary for a certification system to supply certified products of a reasonable level in accordance with market requirements for various convergence equipment. This paper deals with the introduction of certification system of inspection and diagnosis equipment for infrastructure using advanced technologies. Method: The basic elements, systems and procedures of certification system were reviewed through analyzing and comparing the existing similar certification system in Korea. In addition, a survey was conducted on a catalog method and the minimum performance criterion (sampling survey and complete enumeration survey) to equipment developers (manufacturers), clients and equipment users. Result: This survey showed that clients preferred complete enumeration method on the basis of minimum performance, and equipment users also preferred complete enumeration survey and sample survey, for minimum performance, at a similar rate. On the other hand, equipment developers preferred the catalog method. Conclusion: Clients and users who are the users of the diagnostic equipment preferred the minimum performance criterion because their trust in quality is important. On the other hand, developers(manufacturers) preferred the catalog method which adopts self certification because it is regulated in developing various products. There is no specific plan for the minimum performance standards required for the introduction of the method which users demand, at present. In addition, it is not desirable to force to introduce a certification system because it requires a considerable period of study to prepare the specific standards. Therefore, it is appropriate to operate the system for a certain period of time centering around the catalog method for the stable and continuous development of the infrastructure diagnosis and test equipment market in Korea. Also, it is effective to expand and develop the certification system to the extent that it minimizes the impact on the market when specific plans for the standards are prepared in the future.

• The Magazine for Energy Service Companies
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• s.78
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• pp.12-13
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• 2012

중국이 떠오르고 있다. 지나친 산업화의 폐해로 환경오염의 장본인인 중국이 이제 친환경건축물을 통해 에너지 절약과 비용절감을 동시에 노리고 있다. 세계의 공장이라는 타이틀에 걸맞게 이제 중국은 넓은 땅과 수 많은 건축물로 몸살을 앓게 되었다. 많은 조사들이 중국의 산업화를 염려하고 있으며 그에 대한 해결책을 내놓고 있다. 그러나 최근 몇 년 사이 중국 정부에서 발표한 에너지 절감 자료들을 보면 조금이나마 안심이 되는 시점이다. 더구나 정부의 계획과 시장의 기술력의 간극 때문에 외국기업들에게 기회가 되고 있다. 우리나라와 기업들은 이러한 때를 놓쳐서는 안 될 것이다. 특히 ESCO를 통한 에너지절감 방법과 노하우가 전수되고 기술이 중국에 이전됨으로 ESCO의 저변확대를 이뤄나가야 할 것이다.

• Journal of the Korean Institute of Landscape Architecture
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• v.37 no.4
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• pp.12-21
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• 2009

The purpose of this study is to identify the characteristics of amenities available in Sunchang-gun, Jeonbuk province in Korea through ananalysis of survey data of rural amenity resources. This survey was performed over 4 years(from 2005 to 2008). The data were collected by field survey, interview, and Internet search. Descriptive statistics, regression and correlation analyses were performed to identify the characteristics of each Eup-Myun in Sunchang County. A regression analysis was also performed to compare provincial, national and other county data. Furthermore, a rank analysis was performed to classify the type of each region. Through this, the type of rural amenity resources was identified.

• Journal of Cadastre & Land InformatiX
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• v.44 no.2
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• pp.73-90
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• 2014

The Officially Announced Land Price System has a limit, that is required to be able to reflect changes in land constantly every year, to implement Land Characteristic Survey for calculating land price during a specific period and human resources with limited. The purpose of this study is to apply the 'National Territory Space Usage status Survey' method to survey part of the territorial feature status information inside of selected the target sites, considering the core survey items (land category, the state of land use, altitude difference, standard site inclusion, etc) in the areas surrounding Yeonshinnae Station in which three dongs (Galhyeon-dong, Daejo-dong, Bulgwang-dong) of Eunpyeong-gu, Seoul share borders with. Based on the given budget, the manpower and period was taken into consideration to sort a total of 2,041 lots and conduct surveys on all sites. This study will be able to diagnose the efficient idle human resource utilization and work process construction plan through pilot projects specialized for providing real estate information services in preparation for cases in which national territory information survey projects that provide various business model, as well as major future core projects of the corporation will be carried out.

• Korean Journal of Ecology and Environment
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• v.53 no.4
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• pp.365-373
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• 2020

Biomonitoring Survey and Assessment Manual for lake ecosystem suggest zooplankton collection methods to compare relatively the number of species, population density, and community indices, taking into account the convenience of the field sampling according to the sites' water depth. In this study, the oblique towing and 20 m vertical towing methods presented in the manual were respectively compared with the whole water column-vertical towing and we analyzed the differences and characteristics of zooplankton community information gathered by each collection method. For community indices, there was no difference in the comparison of oblique/vertical towing methods in the shallow lake, but in the deep lake, the diversity and richness indices increased when vertically towing through whole water column rather than when limiting the towing depth to 20 m. In addition, the total zooplankton density collected by the oblique/20 m vertical towing methods was about three times higher than the whole water column-vertical towing method, which means that the density of zooplankton community can be overestimated depending on the collection methods. It appears to be results of differences in the zooplankton density by water layer arising from their vertical distribution and in filtered raw water quantity according to the towing depth/distance. Hence, for zooplankton community information to be used as a functional quantitative indicator representing the entire lake, it would be more appropriate to apply the whole water column-vertical towing method with considering the distribution of zooplankton density by depth and contribution rate of each water layer when converting total zooplankton density.

• Proceedings of the Korean Society for Information Management Conference
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• 2014.08a
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• pp.25-30
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• 2014

이 연구는 문헌정보학 학술지에 나타난 전문도서관의 연구동향과 특성을 계량적으로 분석하기 위하여, 관련된 연구논문 79편을 전수 조사하고 저자특성, 연구주제, 연구방법에 대해 정량분석하였다. 전문도서관 연구는 2000년 이후에 활발해지고 있으며, 주로 정보학, 도서관 운영, 참고정보서비스에 대한 연구가 많았다. 저자의 소속기관은 정부출연기관 직원과 대학 교수가 다수를 차지하며 공동연구가 늘어나고 있다. 또한 설문조사, 통계조사 등의 양적연구가 가장 많고 도서관 사례분석 및 사서 인터뷰를 통한 질적연구, 그리고 문헌연구의 순으로 나타난다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.18 no.2
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• pp.33-38
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• 2008

Biometric based authentication can provide strong security guarantee about the identity of users. However, security of biometric data is particularly important as compromise of the data will be permanent. Cancelable biometrics stores a non - invertible transformed version of the biometric data. Thus, even if the storage is compromised, the biometric data remains safe. Cancelable biometrics also provide a higher level of privacy by allowing many templates for the same biometric data and hence non-linkability of user's data stored in different databases. In this paper, we proposed the fast polynomial reconstruction algorithm for fuzzy fingerprint vault. The proposed method needs (k+1) real points to reconstruct the polynomial of degree (k-1). It enhances the speed, however, by $300{\sim}1500$ times according to the degree of polynomial compared with the exhaust search.

• The KIPS Transactions:PartD
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• v.16D no.3
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• pp.295-306
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• 2009

Query execution time minimization is an important objective in distributed database design. While total time minimization is an objective for On Line Transaction Processing (OLTP), response time minimization is for Decision Support queries. We formulate the sub-query allocation problem using analytical models and solve with genetic algorithm (GA). We show that query execution plans with total time minimization objective are inefficient from response time perspective and vice versa. The procedure is tested with simulation experiments for queries of up to 20 joins. Comparison with exhaustive enumeration indicates that GA produced optimal solutions in all cases in much less time.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.20 no.2
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• pp.3-14
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• 2010

In this paper, we present the preimage attacks on step-reduced ARIRANG, HAS-160, and PKC98-Hash. We applied Aoki and Sasaki's chunk serach method which they have used in the attack on SHA-0 and SHA-1. Our attacks find the preimages of 35-step ARIRANG, 65-step HAS-160, and 80-step PKC98-Hash. Our results are the best preimage attacks for ARIRANG and HAS-160, and the first preimage attack for PKC98-Hash faster than exhaustive search.