• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권5호
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• pp.968-988
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• 2010

Anonymous hierarchical identity based encryption (HIBE) is an extension of identity based encryption (IBE) that can use an arbitrary string like an e-mail address for a public key, and it additionally provide the anonymity of identity in ciphertexts. Using the anonymous HIBE schemes, it is possible to construct anonymous communication systems and public key encryption with keyword search. This paper presents an anonymous HIBE scheme with constant size ciphertexts under prime order symmetric bilinear groups, and shows that it is secure under the selective security model. Previous anonymous HIBE schemes were constructed to have linear size ciphertexts, to use composite order bilinear groups, or to use asymmetric bilinear groups that is a special type of bilinear groups. Our construction is the first efficient anonymous HIBE scheme that has constant size ciphertexts and that uses prime order symmetric bilinear groups. Compared to the previous scheme of composite order bilinear groups, ours is ten times faster. To achieve our construction, we first devise a novel cancelable random blinding technique. The random blinding property of our technique provides the anonymity of our construction, and the cancellation property of our technique enables decryption.

• 대한산업공학회지
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• 제41권1호
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• pp.105-114
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• 2015

An empirical analysis study applied to evaluate the effect of critical factors for technology transfer. The research aims to suggest ways of political support in order to facilitate technological transfer and commercialization of public research institute'technology. Based on previous researches, it is determined that five critical factors which effect on technology commercialization. These critical factors are used to derive the order of priority, attribute of the success, and failure factors. The result of this research emphasized on both roles of technology introduction motivation and type of technology transfer. In order to collect data for this research, it is carried out that survey and field study toward to technology user such as manufacturing companies which have contracted with institute A. This research has a meaning in aspects of verification of previous hypothesis through scientific approach and new findings of a significant factor that motivation determines the success or failure of technology commercialization.

• Journal of Information Technology Applications and Management
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• 제26권1호
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• pp.95-102
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• 2019

Public transportation systems play key roles in supporting dynamic activities and interaction between urban places. Especially, high efficient public transportation systems are required in order to support large traffic demands in urban areas. In this paper, we define a new metric, structural activation level (SAL), to replace the conventional transportation share ratio (TSR) measuring efficiency of public transportation systems. First of all, we access the Korea Transport Database (KTDB) and download origin-destination data by transport types to construct traffic networks with respect to transport types for each city. Then, we calculate the QAP (Quadratic Assignment Procedure) correlation between each traffic network and the total traffic network for each city to investigate SAL by comparing cities one another. The results of our investigation reveal inconsistency between TSR and SAL. In Daegu, TSR of public transportation systems is relatively low while SAL is high. In Deajeon, however, SAL is low while TSR is high. Therefore, we suggest to take into consideration SAL as well as TSR in order to investigate the degree of activation of public transportation.

• 한국환경복원기술학회지
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• 제20권4호
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• pp.15-28
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• 2017

A protected area means a space designated and protected by law from development pressure and environmental pressure. It is mainly designated to protect specific ecosystems, natural landscapes, and cultural resources from irrational development (or damage), and involves policies of the public sector such as central and local governments. The United Nations Educational, Scientific and Cultural Organization (UNESCO) has conducted conservation and restoration projects for preserving natural ecosystems and genetic resources. In order to conserve the ecosystem in the protected area, national and public organizations purchase private land and use it ecologically; in addition, ecological restoration project is carried out for the purpose of creating waterside ecological belt or preserving ecosystem. Land acquisition refers to the land where highly influenced by the water quality and need to restore, and purchased by negotiating with the landlord. Although the nation and public institution carried out ecosystem restoration project for partial purchase land in order to conserve ecosystem, it is below the expected effect due to lack of comprehensive management system and have some problems in restoration project and unification of management institutions. Land acquisition in Donggang River Basin Ecological Conservation area is initiated in 2005 for creating income of local residents and ecological restoration. However, the lack of overall management and awareness resulted in poor vegetation growth and poor response by local residents due to terrain exposure. As such, there is insufficient research on the current situation and systematic integrated management although the number of land acquisition is increasing year after year. Futhermore, overall recognition and follow-up monitoring of eco-restoration are still inadequate. Therefore, the survey on the awareness of the purchase land ecosystem restoration project is necessary for the efficient restoration project and establishment of the management strategy for land acquisition in the future. Therefore, in this study, we provide fundamental materials on further research projects by carrying out research on the awareness of ecological restoration projects in the Donggang River basin ecological preservation area.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권11호
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• pp.2956-2979
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• 2012

Along with the development of Information Technology, online transactions through Internet have become more popular for the reasons of convenience and efficiency. In order to provide secure and reliable online transactions, an effective electronic payment protocol is crucial. In this paper, we propose a novel electronic payment protocol for digital product transactions with an offline arbiter to achieve fair exchange, automated dispute resolution, customer anonymity, and customer unlinkability. In our protocol a product token is adopted to eliminate the need of key management for digital product decryption in the offline arbiter. In addition, Elliptic Curve Cryptography (ECC)-based self-certified public key is utilized to further reduce computing overheads. According to our analysis, the efficiency of our protocol can be greatly increased in comparison with previous literatures.

• 한국건설관리학회논문집
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• 제14권4호
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• pp.130-139
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• 2013

재해율은 건설산업의 재해를 예방하고 기업의 안전관리 활동을 촉진하기 위해 공공부문 건설공사의 PQ심사에 반영되고 있다. 그러나 건설산업의 재해율은 최근 다시 증가하고 있는 추세를 보이고 있으며, 이는 현재 재해율에 대한 평가가 재해예방에 큰 영향을 미치지 못했거나 한계에 달했음을 의미한다. 이에 본 연구는 입찰과정에서 안전관련 평가에 대한 강화의 필요성을 인식하고 싱가포르와 일본을 대상으로 낙찰자 선정 시 안전관련 평가항목 및 기준, 평가방법 등의 현황을 조사 분석하여 국내 공공부문 건설공사의 낙찰자 선정평가에 벤치마킹 할 수 있는 기초자료를 제공하기 위한 목적으로 수행되었다. 싱가포르와 일본은 법 제도적 측면의 평가, 안전성과 및 실적에 대한 평가, 해당 공사의 안전관리계획에 대한 평가 등 낙찰자 선정 시 다양한 측면에서 안전관련 내용을 평가하고 있다. 따라서, 국내 공공부문 건설공사에서도 낙찰자 선정 시 기업의 안전성과 및 실적, 당해 사업의 안전관리계획 등 종합적인 안전관련 내용을 평가함으로써 기업의 안전관리 활동을 촉진시킬 필요가 있다. 이를 통해 건설산업의 재해율을 감소시키고 안전의식수준을 향상시키며 나아가 건설산업 전체의 안전관리수준에 대한 발전을 유도할 수 있을 것으로 기대된다.

• 인간식물환경학회지
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• 제23권2호
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• pp.159-170
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• 2020

The purpose of this study was to understand the current status of education and programs and to identify the items that urban residents need most for garden management. First of all, there were 45 sites (40.5%) with gardens operated by city and county local governments nationwide, and 41(91.1%) of them had dedicated staff (1.8 persons on average). The average area of gardens was 18,623 m², garden area per person was 20.27m², the average number of participants was 683, and the average period of use was 8.69 months. In addition to gardening activities, 14 (31.1%) out of 45 sites were operating small group meetings, with an average of 2.29 meetings and 67 participants. In the satisfaction survey after gardening activities, 88.9% of 18 sites were satisfied. According to the questionnaire about education and programs related to garden users, an average of four sessions were conducted per education. In terms of education, the contents were in the following order: basic education on garden cultivation (33.9%) > prior education on garden operation (28.9%) > pest control (14.0%) > eco-friendly management (11.6%) > pesticides and Positive List System (9.9%) > others (1.7%). Over 95% of the respondents were generally satisfied. Regarding the perception survey on which items are needed to develop garden management guidelines, the most necessary items were in the order of crop management (38.7%) > public garden etiquettes among users (27.9%) > pest control (14.4%) > weed management (13.5%) > activities using harvest (5.4%). The contents that are to be included in the guidelines were in the order of garden planning and crop selection (17.2%) > cultivation techniques and schedule (16.5%) > pest and soil management (15.7%) > introduction of garden crops and gardening models (12.7%) > garden etiquettes (10.7%). In establishing urban garden management plans by region, the results will have high utility value as the basic data for continuous garden operation by setting a direction that meets the regional characteristics as well as the needs of urban residents.

• 경영과정보연구
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• 제12권
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• pp.161-179
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• 2003

The purpose of this study is to settle local government accounting system. In order to achieve this object. First, accural accounting should be closely connected with budgetary accounting. Second, a computerized program for double entry book-keeping system must be developed primarily. Finally, the improvement of local government accounting system should be oriented enhancing efficiency and public accountability.

• 대한건축학회논문집:계획계
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• 제34권12호
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• pp.3-12
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• 2018

The purpose of this study is to draw implications for revitalizing public-private partnership system that can reduce the financial burden of the government and utilize the creative know-how of the private sector by analyzing the cases of public building construction projects by public-private partnership method in Japan. In this study, first of all, I looked at the current state of public-private partnership policy in Japan and then selected 8 representative projects as an analysis target. Next, in order to grasp the specific situation that is aimed at securing publicity and revitalizing private participation, I analyzed the role sharing between public and private sectors in the maintenance and management of public buildings, and examined the conditions for private revenue facilities. As a result of the analysis, the following implications were drawn. First, the methods of public building construction by public-private partnership in Japan are largely divided into BTO method based on the PFI method, and the method of installing public facilities and private revenue facilities based on the term leasehold rights system. Second, measures were taken to mitigate the burden of the state and local governments in establishing public facilities. Third, the public has delegated to the private sector actively about the role that the private sector can play, expanding the role of private sector widely from design to operation in the public building construction projects. Fourth, in order to actively participate in private sectors and promote regional revitalization, private profit-making projects are widely accepted, but consideration has been given to guarantee a certain level of publicity.

• 디지털융복합연구
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• 제18권10호
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• pp.129-136
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• 2020

본 연구의 목적은 외부-사회문화적인 요인이 공직사회 부정부패 인식에 미치는 영향을 구조방정식 모델(SEM)을 통해 정량적으로 확인하고, 공직사회 부정부패를 줄이는 방안을 모색하는데 있다. 현재 국민들이 바라보는 공직 부정부패 수준은 상당하며, 더 나은 국가 경쟁력 제고를 위해서도 공직 부정부패를 지속적으로 감소시킬 필요가 있다. 시스템 이론이나 사회 연결망 이론에 비추어 공직사회도 한 국가의 일부로써 공직사회는 외부와 상호작용하고 있다는 확장된 인식을 바탕으로 한 연구가 필요하다. 600명의 설문 결과를 바탕으로 변수들이 정의되어 모델이 구축 되었으며, 분석결과 청탁금지법 시행 이후 공직부패는 줄어들었으며 사회문화적인 요인들이 공직사회에 부정부패에 직접적인 영향을 미치는 것으로 나타났다. 추후에는 공직 부정부패 감소를 위해서는 공직사회 자체적인 노력 외에도 국가 전체적인 시민사회의 교육과 인식의 전환 방안에 대한 구체적인 연구가 필요하다.