• The International Journal of Sustainable Building Technology and Urban Development
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• 제9권2호
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• pp.87-94
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• 2018

Different countries create their own green building rating system to be in line with sustainable development as a response to the urgent call for solution for Climate Change and degradation of the environment due to rapid population growth and economic development. This study conducts a critical review on the Philippine national voluntary green building rating system, BERDE, in comparison with South Korea's national voluntary green building rating system, G-SEED and U.S. rating system LEED. Their categories, building types assessed, and assessment methods were compared side by side to seek better practice(s) for green building rating assessment for Philippine green building projects.

• 정보보호학회논문지
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• 제18권6B호
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• pp.233-248
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• 2008

Advances in electronics and wireless communication technologies have enabled the development of large-scale wireless sensor networks (WSNs). There are numerous applications for wireless sensor networks, and security is vital for many of them. However, WSNs suffer from many constraints, including low computation capability, small memory, limited energy resources, susceptibility to physical capture, and the lack of infrastructure, all of which impose unique security challenges and make innovative approaches desirable. In this paper, we present a survey on security issues in wireless sensor networks. We address several network models for security protocols in WSNs, and explore the state of the art in research on the key distribution and management schemes, typical attacks and corresponding countermeasures, entity and message authentication protocols, security data aggregation, and privacy. In addition, we discuss some directions of future work.

• Journal of Smart Tourism
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• 제4권1호
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• pp.7-18
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• 2024

This study examines Natal in Brazil as a Smart Tourism Destination (STD) based on the perception of public and private managers who are members of the City Tourism Council. The research utilizes a systemic perspective of STD proposed by Ivars-Baidal et al. (2016), consisting of three interconnected levels: Strategic-Relational, Instrumental, and Applied. The findings reveal that Natal faces challenges in terms of infrastructure, accessibility, security, connectivity, and sensoring, which hinder its progress as STD. The study also identifies opportunities in the form of governance structures with smart destinations and the inclusion of smartness guidelines in the City Master Plan. The research aims to contribute to the theoretical understanding of STD and its application in destination development. It highlights the need for innovative planning and management in Natal, emphasizing that adopting the STD from a systemic perspective can enhance competitiveness and elevate the level of smartness in the destination.

• 한국유체기계학회 논문집
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• 제17권6호
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• pp.95-103
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• 2014

During the international effort to develop the next generation nuclear reactor technologies, many new power cycle concepts were derived to improve efficiency and reduce the capital cost. Among many innovative power cycles, it was identified that the supercritical $CO_2$ (S-$CO_2$) Brayton cycle technology has a big potential to outperform the existing steam cycle and eventually replace it. The S-$CO_2$ cycle achieves high efficiency with very compact size, which is the ultimate advantage for a power cycle to have. The S-$CO_2$ cycle has a great potential not only for the future nuclear applications but also for general heat sources such as coal, natural gas, and concentrated solar. In this paper, a brief introduction to the S-$CO_2$ power cycle technologies will be first provided, and a short summary of current research and development status of the power cycle technology around the world will be followed. Especially the research works performed by KAIST, KAERI and several related research institutions in Korea will be reviewed in more detail, since they have recently developing a strong infrastructure to test these ideas by constructing a demonstration facility while producing many innovative ideas to improve and realize the concept.

• Steel and Composite Structures
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• 제22권3호
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• pp.537-565
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• 2016

Australian railway networks possess a large amount of aging timber components and need to replace them in excess of 280 thousands $m^3$ per year. The relatively high turnover of timber sleepers (crossties in a plain track), bearers (skeleton ties in a turnout), and transoms (bridge cross beams) is responsible for producing greenhouse gas emissions 6 times greater than an equivalent reinforced concrete counterparts. This paper presents an innovative solution for the replacement of aging timber transoms installed on existing railway bridges along with the incorporation of a continuous walkway platform, which is proven to provide environmental, safety and financial benefits. Recent developments for alternative composite materials to replace timber components in railway infrastructure construction and maintenance demonstrate some compatibility issues with track stiffness as well as structural and geometrical track systems. Structural concrete are generally used for new railway bridges where the comparatively thicker and heavier fixed slab track systems can be accommodated. This study firstly demonstrates a novel and resilient alterative by incorporating steel-concrete composite slab theory and combines the capabilities of being precast and modulated, in order to reduce the depth, weight and required installation time relative to conventional concrete direct-fixation track slab systems. Clear benefits of the new steel-concrete composites are the maintainability and constructability, especially for existing railway bridges (or brown fields). Critical considerations in the design and finite element modelling for performance benchmarking of composite structures and their failure modes are highlighted in this paper, altogether with risks, compatibilities and compliances.

• 한국측량학회지
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• 제27권2호
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• pp.235-247
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• 2009

지도는 인간생활에 필수적인 정보의 매체로서 최근에는 지도제작 기술의 획기적인 발전뿐 아니라, 최신의 다양한 데이터를 사용자에게 제공하여 여러 분야에서 지도의 활용도가 급격히 증가하고 있는 추세이다. 활용도가 높은 지도의 예는 차량항법 지도이다. 차량항법 지도의 사용이 많은 이유는 사용자가 원하는 신뢰성 높은 다양한 정보를 편리하게 제공하고 있기 때문이다. 이와 같이 지도는 제작 중심이 아닌 사용자 중심으로 변모해야 한다. 최근 국내외에서 구축되고 있는 공간 데이터 인프라의 궁극적인 목적은 사용자에게 필요한 실세계 정보를 용이하게 제공하는 것이다. 그러나 대부분의 수치지도의 구축은 최신의 데이터 제공을 위한 지도갱신 방안, 정확한 데이터 구축을 위한 첨단 측량기술 도입, 많은 데이터 제공을 위한 레이어(정사 영상, DEM 등) 추가와 같은 주로 제작 중심으로 이루어지고 있다. 지도 사용자를 위한 지도 데이터 프로세싱 툴이 제공된다면, 전문적인 소프트웨어나 전문적 지식이 부족한 일반 사용자도 용이하게 원하는 정보를 추출하여 다양한 의사결정에 활용할 수 있다. 이에 본 논문은 지도 사용자를 위한 프로세싱 서비스에 관한 방안을 제시하는 것을 목적으로 하고 있다.

• Journal of the Korean Data and Information Science Society
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• 제23권4호
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• pp.665-675
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• 2012

본 연구의 목적은 IPTV (Internet protocol television)가입자와 디지털 CATV (Community antenna television)가입자의 행동을 비교분석하는 것이다. 이를 위해 수정된 잔차를 이용해 상대적 우위를 분석했다. 본 연구를 위해 수도권에서 100명의 이용자를 대상으로 갱서베이를 실시하였다. IPTV는 디지털 CATV에 비해 양방향 서비스에 맞는 콘텐츠를 가지고 있으며 요금에 대한 만족도도 높았으나 채널부족에 대한 불만이 높았다. 디지털 CATV는 IPTV에 비해 수동적으로 인지하고 가입하였으며, 요금에서도 IPTV에 비해 적게 내고 있지만 불만이 높았다. 주 이용 콘텐츠도 "스포츠"등으로 단방향 콘텐츠이므로 양방향 콘텐츠 활성화가 요구된다. IPTV는 언제나 원하는 콘텐츠를 볼 수 있는 혁신적인 서비스로 인식하고 있으나, 디지털 CATV는 CATV의 연장서비스로 인식하고 있어 양방향서비스의 특성을 살리지 못하고 있는 것으로 분석되었다. 따라서 비슷한 서비스이지만 인식에서 현격한 차이를 보이고 있다.

• International Journal of Computer Science & Network Security
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• 제21권9호
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• pp.118-124
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• 2021

The article examines the formation of a competitive paradigm of economic security of industrial enterprises in the formation of a circular economy. The basic laws of industrial enterprises are formed, which determined the characteristics of competitive positions and threats. The basic competitive concepts and their application at maintenance of economic safety of the industrial enterprises in the conditions of formation of circular economy are described. Thus, the technological approach to the formation of a competitive paradigm is based on production technologies, opportunities for technological modernization and development of infrastructure and intellectual competencies. The institutional concept reveals the regulatory mechanisms for ensuring competitiveness through the protectionism of national industrial enterprises, standardization and regulation of market imbalances. The innovation-investment approach within the competitive paradigm is also manifested in the creation of competitive advantages due to the presence of active innovative developments and their commercialization, knowledge and competencies of staff, capitalization of intelligence and communications, constant updating of infrastructure and technologies. Collectively, innovation and investment effects on the level of economic security allow industrial enterprises to ensure resilience to increasing competition, the emergence of new market challenges in the formation of a circular economy. A strategic approach to the application of a competitive paradigm to ensure the economic security of industrial enterprises allows you to justify the prospects for development and design behavioral models to predict and assess potential threats. The concept of system management is based on the complexity of threat analysis, the integrity of the economic security system, system-forming functions and patterns of implementation of industrial development tasks in the formation of a circular economy. The application of the described concepts is formalized by the authors through the definition of the basic patterns, directions and characteristics of their impact on the elements of the security system of industrial enterprises in the formation of a circular economy.

• Geomechanics and Engineering
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• 제24권1호
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• pp.29-42
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• 2021

The utilization of buildings can be improved by extending them vertically. However, the added load of the extension might require building foundations to be underpinned; otherwise, the loads on the foundations might exceed their bearing capacity. In this study, a preloading method was presented aiming at transferring partial loads from existing piles to underpinning piles. A pneumatic-type model preloading device was developed and used to carry out centrifuge experiments to evaluate the load-displacement behavior of piles, the pile-soil interaction during preloading, and the additional loading caused by vertical extension. The results showed that the preloading devices effectively transfer load from existing piles to underpinning piles. In the additional loading test of group piles, the load-sharing ratio of a pile increased with its stiffness. The load-sharing ratio of a preloaded micropile was less than that of a non-preloaded micropile as a result of the reduction in axial stiffness caused by preloading before additional loading. Therefore, a slight reduction of the load-sharing capacity of an underpinning pile should be considered if the preloading method is applied. Further, two full scale preloading devices was developed. The devices preload underpinning piles and thereby produce reaction forces on a reaction frame to jack existing piles upward, thus transferring load from the existing piles to the underpinning piles. Specifically, screw-type and hydraulic-jack type devices were developed for the practical application of foundation underpinning during vertical extension, and their operability and load transfer effect verified via full-scale structural experiments.

• 항공우주시스템공학회지
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• 제17권6호
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• pp.46-53
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• 2023

도심 교통 체증과 환경오염이 중요한 대도시 문제로 부각되는 가운데, 최근에는 Urban Air Mobility(UAM)가 효율적인 대책으로 주목받고 있다. 본 연구에서는 부산 지역의 지형 및 인프라 등의 실제 데이터를 고려한 GIS 기반 공간 분석과 군집 알고리즘을 수행하였으며 이를 통해 UAM 운영을 위한 버티포트 위치와 경로를 선정할 수 있었다. 부산권 UAM 인프라 시스템의 중심으로 예상되는 김해국제공항을 기반으로, 목표 지역에서 세 개의 버티포트 위치가 적합하다 판단하였으며, 이후 지상 위험 평가(Ground Risk)를 고려한 A^*(A-star) 알고리즘을 이용해 위험도와 거리를 최소화하는 비행경로를 선정하였고, 이를 통해 최소 거리 경로 대비 80.168%의 위험 감소 효과를 확인하였다.