• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.10 no.2
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• pp.84-93
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• 2011

In order to provide the real time and proper information to the pedestrian who is using the transport connection and transfer center through data collecting and processing process, the design of the test-bed (Gimpo airport)'s communication construction and the technology of the pedestrian location tracking has been researched. The design of the communication construction should make sure that it can provide believable data to the user of the transfer center. At the same time, the location tracking should also be considered, so that the require of the communication efficiency and the location tracking efficiency can be met together. In order to make the efficient location tracking technology, the problems related to the commercial technology based real time location identification will be resolved and the new approach method was proposed and be applied and analysed to the test-bed. The wireless access points can be located in the most real-world situation which has added the characteristics of the real building to the electronic map, and through the analysis of theirs location, they can be set as the mainly necessary points for the communication construction design and the location tracking and the method to locate that points has been proposed. How to set, how to apply it to the test-bed and the examination result will be introduced in this paper.

• Management & Information Systems Review
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• v.36 no.4
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• pp.129-148
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• 2017

Conventional exhibition management information systems recommend tourist attractions that are close to the place in which an exhibition is held. Some recommended attractions by the location-based recommendation could be meaningless when nothing is related to the exhibition's topic. Our goal is to recommend attractions that are related to the content presented in the exhibition, which can be coined as content-based recommendation. Even though human exhibition curators can do this, the quality is limited to their manual task and knowledge. We propose an automatic way of discovering attractions relevant to an exhibition of interests. Language resources are incorporated to discover attractions that are more meaningful. Because a typical single machine is unable to deal with such large-scale language resources efficiently, we implemented the algorithm on top of Apache Spark, which is a well-known distributed computing framework. As a user interface prototype, a web-based system is implemented that provides users with a list of relevant attractions when users are browsing exhibition information, available at http://bike.snu.ac.kr/WARP. We carried out a case study based on Korean Tourism Organization Linked Open Data with Korean Wikipedia as a language resource. Experimental results are demonstrated to show the efficiency and effectiveness of the proposed system. The effectiveness was evaluated against well-known exhibitions. It is expected that the proposed approach will contribute to the development of both exhibition and tourist industries by motivating exhibition visitors to become active tourists.

• Journal of Digital Contents Society
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• v.3 no.2
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• pp.211-220
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• 2002

It has not been long since the current form of PDA began to be used widely. The PDA, which first came out in a recognizable form in the market a decade ago, multiplying the number of users, has recently been developed in various forms. It began to make cutting-edge technology available in PDA, and to be subdivided into various forms appropriate for special purposes, which reflected the recent intense competition in the market. It included the function of mobile phone, in tandem with the original function of PDA, by which it brought about other synergy effects and corresponded with the purpose more solidly. Due to these recent changes, PDA has had a dramatically increasing number of users, as well as the wider scope of usage and practical application by introducing new technology. However, research is required in the fields of basic usage and interface. It is important to recognize that PDA is an apparatus that stores for the users contents and information suitable for them, and that responds to them in case of need. PDA therefore needs to convey what the users require more easily and speedily without errors, and to provide them with appropriate information and contents. This paper examined the extent to which the interface of PDA including the input of contents required by the user would be efficient by questionnaires. In addition, alternatives concerning a general application environment of PDA were suggested based on the result of this survey.

• Journal of Internet Computing and Services
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• v.18 no.4
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• pp.121-131
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• 2017

With emergence of Internet, social media, and mobile service, the consumers have actively presented their opinions and sentiment, and then it is spreading out real time as well. The user-generated text data on the Internet and social media is not only the communication text among the users but also the valuable resource to be analyzed for knowing the users' intent and sentiment. In special, economic participants have strongly asked that the social big data and its' analytics supports to recognize and forecast the economic trend in future. In this regard, the governments and the businesses are trying to apply the social big data into making the social and economic solutions. Therefore, this study aims to reveal the capability of social big data analysis for the economic use. The research proposed a social big data analysis model and an online consumer sentiment index. To test the model and index, the researchers developed an economic survey ontology, defined a sentiment dictionary for sentiment analysis, conducted classification and sentiment analysis, and calculated the online consumer sentiment index. In addition, the online consumer sentiment index was compared and validated with the composite consumer survey index of the Bank of Korea.

• Journal of Environmental Health Sciences
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• v.43 no.3
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• pp.223-232
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• 2017

Objectives: In response to increased interest in the safety of children's products, a risk management system is being prepared through exposure assessment of hazardous chemicals. To estimate exposure levels, risk assessors are using deterministic and probabilistic approaches to statistical methodology and a commercialized Monte Carlo simulation based on tools (MCTool) to efficiently support calculation of the probability density functions. This study was conducted to analyze and discuss the usage patterns and problems associated with the results of these two approaches and MCTools used in the case of probabilistic approaches by reviewing research reports related to exposure assessment for children's products. Methods: We collected six research reports on exposure and risk assessment of children's products and summarized the deterministic results and corresponding underlying distributions for exposure dose and concentration results estimated through deterministic and probabilistic approaches. We focused on mechanisms and differences in the MCTools used for decision making with probabilistic distributions to validate the simulation adequacy in detail. Results: The estimation results of exposure dose and concentration from the deterministic approaches were 0.19-3.98 times higher than the results from the probabilistic approach. For the probabilistic approach, the use of lognormal, Student's T, and Weibull distributions had the highest frequency as underlying distributions of the input parameters. However, we could not examine the reasons for the selection of each distribution because of the absence of test-statistics. In addition, there were some cases estimating the discrete probability distribution model as the underlying distribution for continuous variables, such as weight. To find the cause of abnormal simulations, we applied two MCTools used for all reports and described the improper usage routes of MCTools. Conclusions: For transparent and realistic exposure assessment, it is necessary to 1) establish standardized guidelines for the proper use of the two statistical approaches, including notes by MCTool and 2) consider the development of a new software tool with proper configurations and features specialized for risk assessment. Such guidelines and software will make exposure assessment more user-friendly, consistent, and rapid in the future.

• Korean Journal of Construction Engineering and Management
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• v.19 no.2
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• pp.83-95
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• 2018

The aim of this paper is to develop a performance evaluation model for PPP (Public-Private Partnership) projects that appropriately reflects the important traits that are unique to PPP projects. To this end, 1) it defines a set of distinct perspectives involved in the PPP projects and their associated success factors that might differ amongst the perspectives; 2) it identifies the key performance indicators and suggests the performance evaluation criteria for each indicator; and 3) it builds a performance evaluation model by matching the success factors from each perspective with performance measure criteria as well as applies the model to the two selected BTO road projects in Korea. The process of model construction and its application confirms significant differences between the main stakeholder perspectives typically involved in PPP projects, which highlights the need for an evaluation model tailored for PPP projects by taking into account the distinct perspectives. The results from the PPP evaluation model developed in the study is compared against the results from the existing ex-post evaluation model for construction projects in general. The former shows a closer match with the results from the user satisfaction survey conducted. This new evaluation framework and the performance indicators entailed in it permits a balanced evaluation of PPP projects as it takes into account different perspectives involved in PPP projects as well as an understanding of the factors affecting the success of PPP projects. While the construction of the model is based on transport projects, it is applicable to different types of PPP projects through variation with the weight allocation amongst different success factors and/or additions or other adjustments to the performance evaluation criteria as required.

• International Commerce and Information Review
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• v.4 no.2
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• pp.155-175
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• 2002

본 연구는 전자무역을 혁신수용의 관점에서 기술하고 있다. 관련 문헌의 고찰을 통해 천자무역 특성요인과 수용자(무역업체) 특성요인을 도출하고, 이를 바탕으로 연구모형의 개발 및 연구가설을 설정하였다. 연구가설은 인터넷리서치를 통해 수집된 자료를 다중회귀분석기법을 이용하여 검정하였다. 그 결과를 요약하면 다음과 같다. 첫째, 전자무역의 특성변수들(지각된 유용성/편의성/위험성)이 전자무역 수용도에 미치는 영향관계를 검증한 결과, 지각된 유용성과 지각된 편의성이 높을수록 전자무역 수용도가 높은 것으로 나타났다. 둘째, 혁신 수용자로서 무역업체의 특성변수들(혁신성향, 정보인프라 성숙도)이 전자무역 수용도에 미치는 영향관계를 검증한 결과, 혁신성향과 정보인프라 성축도 모두 전자무역 수용도에 긍정적인 영향을 미치는 것으로 나타났다. 이는 혁신성향이 높을수록 그리고 정보인프라가 성숙된 업체일수록 전자무역 수용도가 높게 나타난다는 일반적인 견해와 일치되는 결과이다. 셋째, 두 특성변수들(전자무역 특성, 무역업체 특성)간의 상황적 관계에서는 혁신성향이 낮은 무역업체일수록 전자무역의 정보위험성을 높게 인식하여 천자무역 수용(현재 활용정도와 지속적 이용의도)을 거부할 가능성이 높게 나타났다. 또한 정보인프라 성숙도가 낮은 무역업체일수록 정보위험성을 높게 인식하여 전자무역 수용을 거부할 가능성이 높게 나타났다. 넷째, 전자무역을 통한 수출입 경험여부에 따른 전자무역의 향후 이용의도와의 관계를 분석한 결과 무경험업체의 경우는, 혁신성향이 높고 정보인프라가 성숙된 무역업체일수록 향후 이용의도가 높은 것으로 나타났다. 또한 정보인프라 성숙도가 낮은 무역업체일수록 전자무역의 편의성을 낮게 인식하여 전자무역 수용을 거부할 가능성이 높게 나타났다. 유경험업체의 경우는 전자무역에 대한 향후 이용의도가 높은 무역업체일수록 전자무역의 편의성을 오히려 부정적으로 평가하는 경향이 드러났는데, 이러한 현상은 유경험업체가 인식하는 편의성에 대한 기대수준이 무경험업체에 비해 높기 때문인 것으로 나타났다. 또한 혁신성향이 높은 무역 업체가 향후 전자무역을 지속적으로 이용하기 위해서는 전자무역의 편의성을 더 높게 요구하는 것으로 나타냈다. 전자무역의 수용도를 높이기 위해서는 전자무역의 특성요인들에 대한 잠재적 수용자의 태도변화를 파악하는 것도 중요하지만, 수용자 집단의 특성에 맞는 상황적 전략수립이 동시에 필요하다. 그러한 의미에서 본 논문은 전자무역 수용 촉진 전략을 수용자 집단의 특성별로 그리고 상황적으로 수립할 수 있는 기초자료를 제공할 수 있을 것으로 기대된다.

• Journal of the Korean Institute of Landscape Architecture
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• v.45 no.3
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• pp.9-20
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• 2017

Camp Page, which has been located in front of Chuncheon Station for about 50 years since 1958, recently opened to the public. Chuncheon City is currently struggling to construct a park on this site due to an uncertainty of general plans and financial difficulties. Accordingly, this research conducted a cognitive survey about site usage with Camp Page users in order to clarify directions for efficient establishment of parks within the former military base. The course of research includes analytical methods such as a survey targeting Chuncheon citizens and tourists both in the field and online, a frequency analysis of 1,360 index samples, a cross analysis and t-test. As a result, firstly, Chuncheon citizens recognized the image of Chuncheon as a city with a fresh, clean lakeshore whereas tourists think of it as a city for sightseeing and leisure. Hence, it was justifiable to conclude that the city should organize various programs for people to enjoy leisure activities while at the same time protecting the environment. Second, the awareness of tourists about Camp Page was relatively low and both citizens and tourists recognize that it was not sufficient enough for enjoyment of free time. The majority answered "space for culture and art and for experiencing the natural environment" when asked about the direction of space creation at Camp Page, which indicates that the site will need to be available both for cultural art and nature experiences. Lastly, it was thought that the direction of developing leisure facilities in Chuncheon city should include the improvement of worn out installations and developing chain products among programs. This research will be able to use fundamental data for the efficient utilization of the returned U.S. military camps that are constantly merging.

• Journal of the Korean Institute of Landscape Architecture
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• v.47 no.6
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• pp.87-102
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• 2019

Since the Child Friendly Cities Initiative(CFCI), a UNICEF-led initiative, was first introduced to Seongbuk-gu in 2013, more than half of the districts of Seoul are making efforts to achieve the accreditation of the Child Friendly City(CFC). At this point, when an initiative is transformed from a special policy of a few districts into a general policy of many local governments, we need to examine and check on how friendly urban parks are to children. This study focused on neighborhood parks that tend to be less friendly to children as compared to children's parks and looked into the current status, because neighborhood parks are also well used by users of all ages including children. The evaluation criteria was developed based on the review of domestic and international guidelines of child friendly parks and neighborhood parks. Futhermore, field studies, user questionnaire, and a participatory design workshop were introduced to analyze the status of child-friendly environment of neighborhood parks. Findings are as follows. First, vague definitions of child cause the inconsistency of child-related policies. Second, Neighborhood parks are not conceived as a public space for children. Third, the consideration of youth is relatively low. Fourth, adjacent area of a park turns out not to be child friendly as well.

• The KIPS Transactions:PartC
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• v.12C no.7 s.103
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• pp.949-958
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• 2005

In the paper we study key agreement schemes when a party needs to establish a session key with each of several parties, thus having multiple session keys. This situation can be represented by a graph, tailed a key graph, where a vertex represents a party and an edge represents a relation between two parties sharing a session key. graphs to establish all session keys corresponding to all edges in a key graph simultaneously in a single session. A key agreement protocol of a key graph is a natural extension of a two-party key agreement protocol. We propose a new key exchange model for key graphs which is an extension of a two-party key exchange model. using the so-called randomness re-use technique which re-uses random values to make session keys for different sessions, we suggest two efficient key agreement protocols for key graphs based on the decisional Diffie-Hellman assumption, and prove their securities in the key exchange model of key graphs. Our first scheme requires only a single round and provides key independence. Our second scheme requires two rounds and provides forward secrecy. Both are proven secure In the standard model. The suggested protocols are the first pairwise key agreement protocols and more efficient than a simple scheme which uses a two-party key exchange for each necessary key. Suppose that a user makes a session key with n other users, respectively. The simple scheme's computational cost and the length of the transmitted messages are increased by a factor of n. The suggested protocols's computational cost also depends on n, but the length of the transmitted messages are constant.