• 대한전기학회논문지:시스템및제어부문D
• /
• 제52권1호
• /
• pp.45-50
• /
• 2003

Texture analysis has been efficiently utilized in the area of terrain classification. In this application features have been obtained in the 2D image domain. This paper suggests 3D co-occurrence texture features by extending the concept of co-occurrence to 3D world. The suggested 3D features are described using co-occurrence histogram of digital elevations at two contiguous position as co-occurrence matrix. The practical construction of co-occurrence matrix limits the number of levels of digital elevation. If the digital elevation is quantized into the number of levels over the whole DEM(Digital Elevation Map), the distinctive features can not be obtained. To resolve the quantization problem, we employ local quantization technique which preserves the variation of elevations. Experiments has been carried out to verify the proposed 3D co-occurrence features, and the addition of the suggested features significantly improves the classification accuracy.

• International Journal of Control, Automation, and Systems
• /
• 제6권1호
• /
• pp.62-75
• /
• 2008

Vision-based simultaneous localization and map building using a single camera, while compelling in theory, have not until recently been considered extensive in the practical realm of the real world. In this paper, we propose a simple framework for the monocular SLAM of an indoor mobile robot using natural line features. Our focus in this paper is on presenting a novel approach for modeling the landmark before integration in monocular SLAM. We also discuss data association improvement in a particle filter approach by using the feature management scheme. In addition, we take constraints between features in the environment into account for reducing estimated errors and thereby improve performance. Our experimental results demonstrate the feasibility of the proposed SLAM algorithm in real-time.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2011년도 추계학술대회
• /
• pp.188-191
• /
• 2011

Path finding and path planning is crucial in today's world where time is an extremely valuable element. It is easy to plan the optimum path to a destination if provided a map but the same cannot be said for an unknown and unexplored environment. It will surely be exhaustive to search and explore for paths to reach the destination, not to mention planning for the optimum path. This is very much similar to finding for an exit of a maze. A very popular competition designed to tackle the maze solving ability of autonomous called Micromouse will be used as a guideline for us to design our maze. There are numerous ways one can think of to solve a maze such as Dijkstra's algorithm, flood fill algorithm, modified flood fill algorithm, partition-central algorithm [1], and potential maze solving algorithm [2]. We will analyze these algorithms from various aspects such as maze solving ability, computational complexity, and also feasibility to be implemented.

• Journal of Information Science Theory and Practice
• /
• 제2권1호
• /
• pp.22-34
• /
• 2014

This paper analyzes India's contribution to world tribology research during the period 2001-2012 based on SCOPUS records. India's global publication share, annual output, and its citation impact of Indian contribution, partner countries, leading contributors, leading institutes, and highly cited papers were analyzed. Additionally, a cloud technique is used to map frequently used single words in titles. It is observed that India ranks in the $7^{th}$ position with a global publication share of 3.83% and an annual average growth rate of 25.58% during the period 2001-2012. The citation impact of India's contribution is 6.05 which decreased from 12.74 during 2001-2006 to 4.62 during 2007-2012. 17.4% of India's total research output was published with international collaboration.

• 국제초고층학회논문집
• /
• 제11권1호
• /
• pp.15-24
• /
• 2022

Over the past 30 years, the tall building has seen unprecedented global support. With advanced innovation and many regions around the world discovering increasing growth rates, the tall, supertall, and megatall buildings continue to drastically alter the vertical urbanism of the cities they inhabit. For centuries, urban conditions in most major territories were predominately defined by the street wall and the spaces it shapes. Giambattista Nolli's 1748 Map of Rome most clearly illustrates this significance and possibly solidifies what generations would understand to be the predominant urban condition. As architects, it has been a city's lower vertical wall fabric that has often been the primary focus of efforts to craft an urban experience, and for good reason. Through recent examples of built and unbuilt KPF projects, this paper will explore an upper vertical wall fabric, an urbanism that not only exists at the ground but also within the troposphere.

• Geomechanics and Engineering
• /
• 제30권3호
• /
• pp.233-246
• /
• 2022

In this study, the city of Osijek is used as a case study area for low to medium seismicity regions with deep soil over deep geological deposits to determine horizontal PGA values. For this reason, we propose new regional attenuation equations for PGA that can simultaneously capture the effects of deep geology and local soil conditions. A micro-zoning map for the city of Osijek is constructed using the derived empirical scaling equations and compared to all prior seismic hazard estimates for the same area. The findings suggest that the deep soil atop deep geological sediments results in PGA values that are only 6 percent larger than those reported at rock soil sites atop geological rocks. Given the rarity of ground motion records for deep soils atop deep geological layers around the world, we believe this case study is a start toward defining more reliable PGA estimates for similar areas.

• ETRI Journal
• /
• 제44권6호
• /
• pp.977-990
• /
• 2022

This study proposes a novel method for identifying the primary conspirators involved in terrorist activities. To map the information related to terrorist activities, we gathered information from different sources of real cases involving terrorist attacks. We extracted useful information from available sources and then mapped them in the form of terrorist networks, and this mapping provided us with insights in these networks. Furthermore, we came up with a novel centrality measure for identifying the primary conspirators of a terrorist attack. Because the leaders of terrorist attacks usually direct conspirators to conduct terrorist activities, we designed a novel algorithm that can identify such leaders. This algorithm can identify terrorist attack leaders even if they have less connectivity in networks. We tested the effectiveness of the proposed algorithms on four real-world datasets and conducted an experimental evaluation, and the proposed algorithms could correctly identify the primary conspirators and leaders of the attacks in the four cases. To summarize, this work may provide information support for security agencies and can be helpful during the trials of the cases related to terrorist attacks.

• 국제학술발표논문집
• /
• The 8th International Conference on Construction Engineering and Project Management
• /
• pp.433-439
• /
• 2020

As eco-friendly and sustainable architecture is becoming more popular, the interest in Korean traditional wooden buildings (Hanok) has also been increasing. The building technologies of the wooden construction have been actively developed in all over the world through the diversification of new materials and construction methods. On the other hand, the growth rate of wooden construction market is still slow in Korea. In an attempt to promote the Korean traditional wooden buildings, a comprehensive research project has been conducted. This R&D project is developing standard designs, new materials, and methods for modernized Hanok including houses, public buildings, long-span structures, and even high-rise buildings. To this end, the purpose of this study is to formulate a technological strategy for popularization of modernized Hanok. Influencing variables and issues are analyzed and defined first. At the same time, the five keywords have examined in the perspective of dissemination of modernized Hanok technology. Finally, a technology road map for strategic development of modernized Hanok is proposed through casual diagrams.

• 한국측량학회지
• /
• 제27권3호
• /
• pp.311-321
• /
• 2009

국가측지계는 지도제작 분야, 국토의 개발에 있어 단일한 위치기준을 제공하여 주는 것으로서 국가에서 법령으로 정의하고 유지관리를 하고 있다. 최근까지 세계 각 국가에서는 천문측량에 의한 독자적인 측지계를 사용하였으나, 최근 우주 위성측지기술의 발전으로 전 지구 규모의 고정밀 측지기준계(세계좌표계)가 개발되어 사용되고 있다. 우리나라도 2001년 12월 측량법을 개정하여 기존에 사용하던 Bessel 타원체를 준거타원체로 하는 기존측지계에서 GRS80타원체를 준거타원체로 하는 세계측지계로 국가측지계를 전환하였다. 이에 따라 국토지리정보원을 중심으로 다양한 연구결과가 도출되어 세계측지계로의 전환을 위한 기술적 제도적 기반이 어느 정도 갖추어졌음에도 불구하고, 국토지리정보원, 국토해양부 및 일부 지방자치단체가 세계측지계 전환을 추진하고 있어 지방자치단체나 공공기관으로 확산되지 못하고 있는 실정이다. 따라서 세계측지계 전환을 활성화하기 위해서는 현재 세계측지계 전환의 기술적, 제도적 문제점 및 저해 요인을 분석하고 해결 방안을 제시하여 이에 대한 정책적 실행방안의 수립이 요구된다. 이에 본 연구에서는 선행연구결과 및 자료조사, 세계측지계 전환 추진현황을 분석하고 세계측지계 전환의 문제점을 분석하여 기술적, 제도적 보완사항을 제시하고, 전환 대상 및 전환 유형에 대한 표준화를 수행하였으며, 국토지리정보원 및 유관기관의 업무범위 제시 및 2010년 세계측지계 전면 사용을 위한 정책방향을 제시함으로써 세계측지계 전환의 활성화를 도모하고자 하였다.

• 한국측량학회지
• /
• 제31권1호
• /
• pp.1-9
• /
• 2013

본 연구는 유전 알고리즘을 이용하여 다대다 면 객체 정합을 수행하는 방법을 제안한다. 동일한 지형 지물을 표현하는 객체 집합의 형상은 서로 동일하다는 가정 하에 형상 유사도를 최적화하는 객체 집합을 두 지도 사이에서 탐색함으로써 정합을 수행한다. 이 때 어떤 객체가 객체 집합에 포함되는지의 여부를 이진 부호로 표현하고, 이진 부호들을 결합한 이진 문자열로 후보해를 표현한다. 초기 후보해들로 해집단을 생성한 뒤, 유전 알고리즘에 의하여 점진적으로 해집단의 품질을 개선함으로써 최적해를 탐색하였다. 제안된 방법을 평가하기 위하여 수원시 도심지역의 수치지형도와 지적도에서 가구계 대응 면 객체 집합을 탐색하였으며 제안된 알고리즘의 효용성을 확인할 수 있었다. 또한 수작업에 의한 탐색결과를 이용하여 평가한 결과 0.946의 정확도를 얻었다.