• Journal of Korea Multimedia Society
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• v.16 no.7
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• pp.810-819
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• 2013

FCM (Fuzzy C-Means) clustering algorithm, a typical split-based clustering algorithm, has been successfully applied to the various fields. Nonetheless, the FCM clustering algorithm has some problems, such as high sensitivity to noise and local data, the different clustering result from the intuitive grasp, and the setting of initial round and the number of clusters. To address these problems, in this paper, we determine fuzzy numbers which project the FCM clustering result on the axis with the specific attribute. And we propose a model that the fuzzy numbers apply to FDT (Fuzzy Decision Tree). This model improves the two problems of FCM clustering algorithm such as elevated sensitivity to data, and the difference of the clustering result from the intuitional decision. And also, this paper compares the effect of the proposed model and the result of FCM clustering algorithm through the experiment using real traffic and rainfall data. The experimental results indicate that the proposed model provides more reliable results by the sensitivity relief for data. And we can see that it has improved on the concordance of FCM clustering result with the intuitive expectation.

• Journal of the Korean association of regional geographers
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• v.12 no.2
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• pp.215-228
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• 2006

Because of the technological innovation of information-communication, the liberalization of world trade and the intensification of regionalisation, the world economic space is in progress of globalization that is not only a product but also a capital, technology and labour move freely over the countries. In the globalized economic space, the multinational finns accelerate a globalization of capital and labour by exporting the capital to the peripherals countries for the low cost of production and importing the low wage labour from the peripherals countries. East Asia which appeared one of the world triad economic axis with a rapid regional economic growth after 1980's intensifies the regionalisation of capital and labour. As the increase of gap in cost of production and income level among the countries, not only the direction of flows of capital and labour but also the traits of migrant labour also changes remarkably.

• Archives of design research
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• v.16 no.1
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• pp.15-24
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• 2003

In the latest date, vehicles are offered to the drivers, not only the skill for shifting but the pleasure for driving vehicles that are existing today can be a social problem because the amount of vehicles that are increasing give difficulty for the traffic facilities and parking expansion. these day 80% of four wheeled vehicle carriers single or double person the reducing car scale is an important thing about the financial good use resources of energy and the storage of environment. A solution for these problem is a new general idea vehicle development for one or two person to ride. For the sake of these reasons, first, the information is collected and analyzed about existing foreign countries production. Car external design is intended by mathematical modeling, simulation and model testing about frame system of new concept specially we would like to show three wheeled vehicle that has active tilt control(ATC) system. This car tilts actively by the center rotation wheel and frame when the vehicle turns.

• Journal of Korean Society for Geospatial Information Science
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• v.17 no.4
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• pp.95-103
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• 2009

Global interests for construction of 3 dimensional spatial information has risen due to development of measurement sensors and data processing technologies. In spite of criticism for the violation of personal privacy, CCTV cameras equipped in outdoor public space of urban area are used as a fundamental sensor for traffic management, crime prevention or hazard monitoring. For safety guarantee in urban environment and disaster prevention, a surveillance system integrating pre-constructed 3 dimensional spatial information with CCTV data or video sequence is needed for monitoring and observing emergent situation interactively in real time. In this study, we proposed applicability of the prototype system for web visualization based on X3D, an international standard of real time web visualization, by integrating 3 dimensional spatial information with video sequence.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.5 no.2
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• pp.37-46
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• 1987

The single photo method has a lot of applications in forestry, traffic accident managements, industry, criminal investigation, and in daily life. In this study a new single photo method was developed by classifying into the Space resection method and the 2 Dimensional Perspective Transformation method. Metric and nonmetric cameras were used to analyse the accuracy by means of single photo method, and the errors in coordinates and lengths were studied by changing the number and arrangement of control points to obtain the optimum condition for the single photo method. The influence of number and arrangement of control points on the accuracy was relatively small in case of the Metric WILD P31 and ASAHI PENTAX 6$\times$7 cameras, where as for errors it was a major factor in the Non-metric Nikon FM2. To overcome these defects, at least 6 control points should be used for the errors to be convergent and they should be distributed evenly over the surveying area. It was found that accuracy increased as the object to be photographed was placed in the perpendicular direction to the axis of camera.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.7 no.1
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• pp.22-31
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• 2008

RT/IMPOST is an effective algorithm that can realize real-time internal metering policy (IMP) using queue information from loop detector and signal control strategies. In this paper, an investigation was made to adopt the IMP methodology within COSMOS environments in terms of communication environment and control time point. Through the analysis of the communication environment of COSMOS and communication and control steps in RT/IMPOST, a set of applicable alternative were developed and evaluated. Then, one of the alternatives was selected, and performance of the alternative was compared with RT/IMPOST system using a simulation technique. Results showed that two techniques produced the similar performance. Therefore, the method suggested in this paper was evaluated as a practically viable alternative.

• Journal of the Korean Society for Railway
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• v.14 no.4
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• pp.370-375
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• 2011

In this paper, as a follow-up PRT studies of "J. Lee & K. Kim[2]", in terms of public transportation systems, economic feasibility of PRT systems was investigated. Based on previous studies, PRT demand was estimated and the required number of PRT vehicles has been calculated and the benefit was estimated. To ensure the economic feasibility, construction cost of a PRT system should be the level of 8 billion won per km, and the annual operating costs of the PRT system construction should be approximately 4.63% level. As a result, how much to reduce PRT construction costs, depending on whether decisions are considered to be economically feasible. Thus, PRT technology development will be conducted by targeting the most lightweight and by minimizing the infrastructure and vehicles of PRT.

• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.417-417
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• 2019

하천의 기능은 공학적 관점에서의 이수, 치수, 환경 기능 외에도 사회적 관점에서 역사 문화 기능을 포함할 수 있다(우효섭, 2009). 1990년대 말부터 하천복원사업이 본격화 되면서 최근에는 하천환경 기능 외에도 친수를 포함한 역사 문화 기능이 하천관리의 주요 축으로 고려되거나 포함되고 있다. 이 과정에서 하천의 역사 문화 기능을 주문하는 요구가 증가한 이유로는 하천복원사업의 지역적 획일화, 친수(심미) 요구 증대, 지역 경제성 제고, 환경(생태, 문화 등) 가치 증대 등 사회경제적 정책적 환경 변화가 기인한 부분이 크다고 할 수 있다. 이러한 측면에서 볼 때 하천의 지속가능하고 효과적인 관리와 보전을 위한 방안으로 하천의 역사 문화적 요소를 사회 경제적, 생태 환경적 요소와 연계하는 접근방식은 유용할 수 있다. 이를 위해서는 우선적으로 지역공동체가 형성해온 물 문화의 특수성을 감안하여 하천유역의 역사 문화적 소재 및 자원을 발굴할 필요가 있다. 그리고 조사 수집된 다양한 역사 문화적 소재 및 자원은 하천사업 및 관리의 주요 콘텐츠로 활용되기 위한 창출과정을 진행함으로써 사회 경제적, 생태 환경적 요소와 연계할 수 있다. 본 연구에서는 하천유역을 대상으로 문헌조사 기반의 사전조사와 심도 있는 현장조사(탐문조사 등) 수행결과를 토대로 향후 하천복원사업에 활용될 수 있는 다양한 역사 문화적 소재와 자원 등에 관한 콘텐츠를 도출하였다. 또한 콘텐츠 활용방안은 하천 역사 문화 자원의 세부적인 콘텐츠를 아우를 수 있는 테마설정을 통하여 대상지 및 지역특성(치수 안전, 지역요구, 물 문화 가치 등) 등을 고려한 방안을 제시하였다. 특히, 친수 측면에서 현재 수변공간을 이용하는 방문자수, 목적(산책, 스포츠, 낚시, 물놀이, 레저 등) 등에 대한 패턴과 지역 인구 현황, 접근 인프라(교통, 이동로, 편의시설 등), 주민 요구도 등 잠재적 친수도는 물 문화 형성이라는 측면에서 볼 때 주요한 고려사항이라 할 수 있다.

• Journal of the Korea Convergence Society
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• v.10 no.6
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• pp.179-184
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• 2019

Recently, various problems have arisen due to the popularization and aging of urban railway transit, which is the key transportation of large cities. In this study, the vibrational accelerations for the Daegu Metropolitan City Urban Railway(Line 1) were measured and evaluated using the smartphone built-in acceleration sensor and the approved application. For this purpose, the three axes running accelerations were measured according to the domestic standard (KS R 9160), and the acceleration data along the 32 stations (3 directions) were analyzed and compared. In addition, the increasing of acceleration values caused by the change of vibrational environment was monitored along the main stations between the time in 1997 and 2017. It was found that there are considerable increase of lateral and vertical directional accelerations due to the aging of railway facility environment for the last 20 years. The results of this study have valuable means for evaluating the ride quality of urban railway and the vibration influence on surrounding structures.

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.7
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• pp.863-869
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• 2018

Due to recent changes in the maritime traffic environment, naval warship accidents are constantly occurring. Especially in 2017, serious loss of life was caused by a US navy destroyer accident. The purpose of this study is to analyze the characteristics of naval warship accident cases and construct an accident scenario by using naval training materials, adjudication of naval warship accidents and US navy destroyer accident reports. Based on the surveyed data, the status of accidents was identified and cases were analyzed. We reproduced 17 accident cases in accordance with accident reproduction procedure and constructed naval warship accident scenarios. As a result of analyzing the CPA, TCPA and PARK model for risk, reproducing 17 naval ship accident cases, collision risk increased on average 5-6 minutes before an accident. The result of this study represents basic data for naval and simulation education materials, contributing to the prevention of marine accidents.