• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.653-656
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• 2007

1998년 European Commission에서 권고한 이래 LRIC 모형은 미국 및 유럽 각국의 규제기관 (National Regulatory Authorities ; NRA)에서 상호접속규제를 시행하는데 사용되는 주요 수단이다. 2004년 영국의 이동전화 착신서비스에 대한 보고서에서 영국의 Ofcom은 LRIC를 2G방식의 이동전화 착신서비스 제공에 따른 원가산정 방법으로 채택하고 있다. 그러나 기존 2G 사업자들이 3G시장에 참여함에 따라 2G 음성통화가 3G로의 전이가능성이 제기되어 3G 서비스제공에 따른 2G 접속료 시장의 충격을 완화하고자 LRIC모형에 3G서비스를 추가하게 되었다. 이동망 원가모형의 기본 구조는 크게 다음과 같은 4개의 모듈로 구성되는데, 이중에서 사업 자간 문제제기가 많고 이견이 많았던 Network모듈과 이동망 모형의 선행모듈인 Input 모듈에서 제기된 이슈사향을 살펴보고, 국내 이동망 LRIC 모듈 개발시의 시사점을 도출하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.5
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• pp.723-737
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• 2017

In order to decide the national technical standards policy for national policy/market economy activities, the people in charge commonly make policy decisions based on the current technology level/concentration/utilization by means of major common technology field analysis using patent data. One possible source of such patent data is the domestic mobile carriers through the Korea Intellectual Property Rights Information System (KIPRIS) of the Korean Intellectual Property Office (KIPO). Using this system, we collected 20,294 patents and 152 International Patent Classification (IPC) types and confirmed KTs (9,738 cases / 47.98%), which perform relatively high technology retention activities compared to other mobile carriers through the KIPRIS of KIPO. Based on these data, we performed three analyses (SNA, PCA, ARIMA) and extracted 30 IPC types from the SNA and 4 IPC types from the PCA. Based on the above analysis results, we confirmed that 4 IPC (H04W, H04B, G06Q, H04L) types are the major common technology field of the domestic mobile carriers. Finally, the number of 4 IPC (H04W, H04B, G06Q, H04L) forecast averages of the ARIMA forecast result is lower than the number of existing time series patent data averages.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.07a
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• pp.227-228
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• 2020

어린이 교통관련 안전사고 잠재적 위험요인 및 개선요인을 도출하기 위해 119구조구급자료 중 6세부터 11세까지의 어린이 사고 자료를 분석하였다. 4개 광역지자체의 2014년부터 5년간 자료에 대한 사고내용을 전수 조사하여 분석하였다. 주요 사고 장소 및 시간대 분석 결과 어린이 교통사고는 하교시간 오후 시간대에 도로에서의 집중적 관리가 필요한 것으로 나타났다. 어린이 교통사고 잠재적 위험요인을 분석한 결과 자동차와 자전거를 이외 탈 것에 관한 사고비율이 최근 높아지고 있음을 확인하였다. 연간 교통사고 전체 건수에 대한 추이는 큰 변화는 없었으나 개인 탈것의 사고 증가는 뚜렷하였다. 그 중 킥보드에 대한 사고가 가장 많았고, 퍼스널 모빌리티가 가장 뚜렷한 증가 분야였다. 현재 어린이에게 적용되고 있는 퍼스널 모빌리티 등에 대한 안전가이드라인이나 규정 등은 미비하나 향후 퍼스널 모빌리티의 보급은 크게 늘어날 것으로 전망된다. 향후 어린이 교통사고를 줄이기 위해서는 어린이가 개인 전동 이동수단 활용 시 안전에 대한 규정마련과 교육이 시급하다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.6 no.2
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• pp.45-56
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• 2007

As function and scale of the transit center get larger, the efficient guidance system in the transit center is essential for transit users in order to find their efficient routes. Although there are several studies concerning optimal path for the road, but insufficient studies are executed about optimal path inside the building. Thus, this study is to develop the algorithm about optimal path for car owner from the basement parking lot to user's destination in the transfer station. Based on Dijkstra algorithm which calculate horizontal distance, several factors such as fatigue, freshness, preference, and required time in using moving devices are objectively computed through rank-sum and arithmetic-sum method. Moreover, optimal public transportation is provided for transferrer in the transfer station by Neuro-Fuzzy model which is reflected on people's tendency about public transportation mode choice. Lastly, some scenarios demonstrate the efficiency of optimal path algorithm for pedestrian in this study. As a result of verification the case through the model developed in this study is 75 % more effective in the scenario reflected on different vertical distance, and $24.5\;{\sim}\;107.7\;%$ more effective in the scenario considering different horizontal distance, respectively.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.5D
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• pp.597-604
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• 2009

The mass transit networks in Korea, such as buses, metro and subway, are co-related and the number of transfer points, in which a lot of pedestrian movement is generated, are rising. The functions of the transfer centers, in which several travel modes cross at a point, have to include convenience and comfort for pedestrians using the transfer centers, and such functions can make transit a more attractive travel option and thus eventually contribute to increases in ridership. However, the guidelines for station layouts and their assessments in transfer stations are not suggested so far. So the pedestrian pattern data (pedestrian walking distances and times, pedestrian approaching distances and times, pedestrian walking paths in the inside of stations) was collected and analyzed. Based on the results of the analysis, the ways to measure the quality of comfort for those who using transfer facilities were suggested using the times that pedestrians consume to transfer from a travel mode to another. The walking time of pedestrians at the inside of stations was also measured by pre-selected pedestrian pathways as the guidelines for station layout assessment in transfer facilities.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.22 no.4
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• pp.114-131
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• 2023

Personal Mobility (PM)-related accidents have increased rapidly since PM use was activated. In response to the increase in these accidents, the government strengthened regulations for PM users on May 13, 2021. The number of the accidents in which the PM user was a victim decreased significantly. In contrast, the increasing number of accidents in which PM user was the offender did not decrease significantly. In most of these accidents, the PM user was the offender who crashed into pedestrians. Hence, the safety of pedestrians is threatened. Therefore, this study analyzed the factors, such as the regulations, urban built environment, and personal characteristics, affecting the severity of PM-pedestrian accidents by focusing on PM-pedestrian crashes. This study analyzed the PM-pedestrian accidents in Seoul from 2020 to 2021 using binary logistic regression model. Through these results, this study proposed the policy implications.

• Convergence Security Journal
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• v.6 no.4
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• pp.171-177
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• 2006

The hacking aspect of recent times is changing, the phishing attack which uses a social engineering technique is becoming the threat which is serious in Information Security. It cheats the user and it acquires a password or financial information of the individual and organization. The phishing attack uses the home page which is fabrication and E-mail and acquires personal information which is sensitive and financial information. This study proposes the establishment of National Fishing Response Center, complement of relation legal system Critical intelligence distribution channel of individual and enterprise.

• Journal of the Korean Regional Science Association
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• v.33 no.3
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• pp.101-113
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• 2017

This study examines the mobility of the disadvantaged population groups in terms of public transportation using the 2014 smart card data in Seoul, Korea. Particularly, we focus on the disadvantaged population such as senior group, junior group, and low-income population group. Based on the spatial distributions of public transportation mobility levels and the disadvantaged population groups, we identify specific areas where public transportation service should be improved for the disadvantaged population. As a result, we identify 15 administrative-dongs where the ratio of the disadvantaged population is high while the mobility index of public transit is low. The main contributions of this study are as follows. First, we use the smart card data which contains the information of actual trip made by individuals and develop the evaluation process of urban mobility for the disadvantaged population groups. Second, we identify the specific areas where public transportation service should be improved for the different group of the disadvantaged population. Lastly, we discuss policy implications to improve the urban mobility of the disadvantaged population.

• Trans-
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• v.10
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• pp.15-29
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• 2021

After the coronavirus pandemic, quarantine or social distancing was required for public health and almost all international exchanges were restricted. Those changes affected huge peoples lifestyle including a way of behaving, purchase and even old habits seemed unable to change. The art market also faced many changes. Art fairs are the primary sectors in the art market but restrictions on gathering and exchanges between countries have primarily affected the size and the type of event. Online platforms are rising, art fairs opened online viewing rooms on the internet instead of booths in the convention center. Even galleries opened their own viewing rooms or renewed online pages to promote artworks and communicate with customers. In this paper, we will examine the effects of Corona on the art market and will seek a way to react to those changes and challenges.

• Korean Journal of Construction Engineering and Management
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• v.15 no.5
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• pp.31-39
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• 2014

It has been a long time since cars had become important means of transportation in human life. Since 1970s, cars have been increasing steadily because of rising individual income and changing lifestyle toward leisure and convenience. The number of cars is just 1.8 per thousand populations in 1970s, however, in 2012, it has increased to 291.15. Forecasting the demand for cars would be useful to plan, construction or management in the field of motor industry, road building and establishing facilities. Our study predicts the demand of cars through estimating the growth curve model. Especially, we include ageing variables to forecasting identifying the effect of ageing on the demand of cars. The main findings are as follows. In 2045, the number of cars is expected to reach 486.8 per thousand populations with passing a primary saturation point at early 2020s. Also, due to effect of ageing, the predicted demand of cars is about 10% lower than in case of which if ageing effect not exist.