• 한국기계가공학회지
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• 제17권4호
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• pp.55-63
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• 2018

In recent years, with the growing interest in electric vehicles, the development of a Neighborhood Electronic Vehicle (NEV) made for urban driving is accelerating. Existing NEVs are set to ~0.3 - 0.35 with more emphasis on performance rather than minimizing air resistance. In this paper, a NEV with a streamlined car body is proposed. The shape of dolphins and sharks was applied to the car body to minimize the air resistance generated when driving. Also, the performance of the vehicle was estimated by calculating the traction force and the roll couple, etc. To check the drag coefficient of the car body, finite element analysis software (COMSOL Multiphysics) was used. The frame of the vehicle is divided into the forward and the rear parts. Carbon pipe is used for the frame by MIG welding. The car body of the vehicle was fabricated by forming carbon fiber. This study confirmed the general possibility of using NEVs through driving experiments.

• 한국기계가공학회지
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• 제18권12호
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• pp.91-97
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• 2019

Since the 2000s, mechanical parking lots have become an increasingly common solution to serious parking difficulties in urban areas. While safety regulations are in place, they can avert or minimize accidents only when drivers understand and comply with them, and so do not always prevent drivers from making mistakes. As a result, the number of serious accidents caused by driver errors continues to increase in proportion to the rapid increase in vehicles. Most of these accidents are caused by abnormal vehicle entry, despite the safeguards already in place. Therefore, in this thesis, we will study the vehicle entry prevention system and suggest how it can be made more effective in stopping or minimizing accidents.

• 한국측량학회지
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• 제30권3호
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• pp.279-285
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• 2012

지상3차원레이저스캐너는 산사태 모니터링, 문화재 문서화, 토목건설, 도시공학 등의 분야에 그 활용이 날로 증가하고 있다. 그러나 지상3차원레이저스캐너의 측정값의 정확도 평가, 실험용 타깃 및 장비 교정, 그리고 시험 절차 등에 대한 국제 표준규정이 마련되어 있지 않다. 이에 본 연구에서 지상3차원레이저스캐너의 거리측정을 위한 타깃을 제작하였고, 또 이 타깃으로 지상3차원레이저스캐너의 거리측정 정확도를 검정하여 실험용 타깃으로서의 적합성을 확인하였다.

• Corrosion Science and Technology
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• 제16권6호
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• pp.273-277
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• 2017

Atmospheric corrosion is clearly the most noticeable of all corrosion processes. A tremendous amount of economic losses are caused by atmospheric corrosion. Thus, it is imperative to know the level of atmosphere's aggressiveness or in other words "corrosivity", before designing or planning any corrosion prevention strategy. In Singapore, corrosivity values were not recorded earlier though the process of measurement and recording was prevalent in other countries. With an aim of filling this gap, three test sites were setup at three locations in Singapore to represent marine, industrial and urban atmospheres or their mixtures. Subsequently, corrosivity readings were measured and recorded according to ISO 9223:2012 for the first time in Singapore. Salient atmospheric constituents or parameters like time of wetness (TOW), $Cl^-$, $SO_2$, $NO_2$, $O_3$, and $HNO_3$ were measured at all sites over a period of time to categorize corrosivity of particular atmosphere. The effect of the atmosphere on corrosion of steel, Cu, Al, and Zn has also been investigated and quantified. "Estimated" and "determined" corrosivities were quantified and compared according to ISO 9223 standard. The study data along with final corrosivity measurements will be presented and discussed in the present work.

• 국제초고층학회논문집
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• 제13권1호
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• pp.97-102
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• 2024

In this paper, we would like to share our ongoing research on global population and demographic shifts and the corresponding need for diverse responses. As population growth varies worldwide, the pressing issue is the current global housing shortage. The USA alone lacks 4 million homes, underlining the urgency for new construction and renewal of existing. Our focus is primarily on new building processes, which must also incorporate elements of renewal for future sustainability. Our research addresses several key questions: How will roles for construction professionals change? What should be the primary goal of the design process? What types of technologies are currently available, and which aspects of the process can be enhanced with AI? A significant part of our study is exploring sustainable building methods that reduce embodied carbon and increase speed of construction. Our goal is to extend the transition from smart homes to cities, analyzing the evolution towards smart communities and cities. A critical aspect of our research is the 'kit of parts concept, involving prefabrication and modular construction. This approach is essential for both rebuilding and new projects, potentially lowering costs in manufacturing and design for long term. Lastly, we present a detailed comparison of the construction industry with manufacturing.

• 국제지역연구
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• 제14권3호
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• pp.454-476
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• 2010

이 논문은 한 국가가 요소부존으로 인구(N), 자본(K)과 토지(Z)를 갖는다고 가정한다. 1단계로 교육은 인구와 자본을 결합하여 신지식과 신기술을 체화한 '교육노동'(educated labor)을 '생산'하고, 2단계로 '교육노동'과 '비교육노동'(uneducated labor)을 결합하여 제조업을 생산하고 '비교육노동'과 토지를 결합하여 농산물을 생산하는 무역모형을 제시한다. 이 모형에 의하면 일단 무역이 시작되면 국가의 특성에서 자본증가율이 높을수록, 토지사용률이 낮을수록, 할인율상승률이 낮을수록 제조품이 수출되고 농산품이 수입되는 무역패턴이 강화된다는 것이다. 또한 자본증가율, 인구증가율, 토지사용률과 할인율의 차이가 있는 국가간 무역이 발생하면 이 무역모형은 양국의 교육노동증가율 격차는 확대되고 교육노동 상대임금 상승률은 토지사용률의 차이가 있는 경우를 제외하고 그 격차가 축소되는 것을 보여준다. 그리고 두 노동자간 소득비율변화에 대해서 무역은 명목소득 비율보다는 실질소득 비율에 더 영향을 미치고 있다는 것을 보여주고 있다. 도시지역에 교육부문과 제조업이, 농촌지역에 농업이 존재한다고 한다면 농촌지역에서 도시지역으로 인구이동현상을 교육노동자가 되기 위한 것과 제조업과 농업의 한계생산물 차이로 설명할 수 있는 모형으로 확대적용할 수 있다.

• KIEAE Journal
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• 제12권6호
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• pp.77-84
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• 2012

The current architectural design of unit modular has been based on 2D of CAD program, so unit modular character which needs unit information management, as a dried-member system, has no effect on design process. The purpose of this study is We have developed a suitable BIM design process, according to various works of construction, then tried to contribute to supply and activation of the urban-life-housing based on unit modular. The BIM modeling process based on unit modular has been in order of unit combination with preparing manual classification, and, it has been constructed, at construction site, from housing foundation to roof finish by Bottom-up method. At a manufacturing factory, it has been produced in order of 1) grouping materials and parts, 2) fabricating unit boxes, and 3) interference examination of unit boxes, and each order has been classified as housing structure, architecture, plumbing process separately. At a construction site, the fabrication has been done in order of, like as a real housing construction scenario, 1) RC foundation work 2) unit module job-site-fabrication work, 3) roof truss work, 4) plumbing and HVAC work, and 5) housing interior finish work. After modeling process, the interference examination on each work of construction has finally completed modeling. The Unit modular utilizing BIM modeling can make easy housing maintenance through systematic control with preparing manual of unit module information, and securing accurate and speedy construction information. And it will promote design credibility and create maximum effect of unit modular construction method, such as construction period reduction and upgrade of construction quality, etc., through the computer simulation as real as construction environment in cyber space, and with the interfering examination.

• 한국지역지리학회지
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• 제17권5호
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• pp.536-553
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• 2011

최근 산업도시 성장 이후 탈산업화 시대에 전개되는 새로운 도시화에 대한 논의가 포스트모던 도시, 소비도시 등으로 다양하게 전개된다. 도시화의 단계적 접근에서는 인구 변화와 이동에 기초하여 거대도시는 도시화의 후기 단계인 재도시화를 경험하고 있으며, 이러한 도시화 단계는 시차를 두고 점진적으로 하위 규모 도시에서 나타날 것으로 추정된다. 그러나 산업 재구조화는 인구 규모만으로는 포착되지 않는 새로운 도시화 특성을 유발할 것으로, 본 연구는 한국 대도시의 도시화 특성을 이동, 통근 인구 그리고 이들의 지리적, 사회적 특성에 기초하여 검토하였다. 대도시별 도시화 경험은 다르게 나타나는데, 서울은 단계적 도시화 과정을 거치지만, 다른 대도시들은 산업도시와 탈산업도시로의 전이에서 다양한 모습을 드러낸다. 특히, 지방 대도시의 경우 산업 기반의 교외화가 이루어졌으나 중심 도시의 편리한 주거, 생활 환경으로 중심 도시에 거주하며 주변으로 역통근하는 인구가 늘고 중장년층의 경제활동 가구가 대도시로 유입되며 주거 기능이 새로운 도시의 역할로 확대되는데, 이는 한국 대도시의 새로운 도시화 특성이라 하겠다.

• 대한토목학회논문집
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• 제39권5호
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• pp.637-645
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• 2019

기후변화와 새로운 에너지정책의 변화등 대내외적인 환경정책의 변화로 도시특성과 에너지 사용량에 대한 파악이 필요하다. 기존에도 도시공간 구조를 활용한 연구는 누적되어왔지만 대부분 거시적으로 국가별, 수도권 위주, 대도시를 대상으로 했으며 경제성장이나 탄소배출과 에너지 사용량의 관계에 주목하였다. 본 연구는 이와는 달리 세부적으로 도시특성을 반영한 데이터를 바탕으로 기존의 교통에너지를 제외하고 가정과 산업 에너지 환경의 기반인 전기와 가스에너지 사용량과의 상관관계를 파악하고자 한다. 본 연구는 도시 토지이용과 제조업특성을 고려하여 도시 특성과 전기와 가스 에너지 사용량과의 연관성을 실증적으로 분석하였다. 통계적으로 유의미한 변수 중에서도 세대수와 면적의 도시 규모 특성과 지방세 징수액, 자동차 등록대수와 같은 경제적 특성, 도로와 시가화밀도등의 도시화 특성은 에너지사용량을 증가시키는 상관요인들로 도출되었다. 본 연구는 수도권 중심의 에너지 소비 분석에서 벗어나 부산광역도시권 지역사회 에너지 정책의 이론적 근거를 마련하는 데 도움이 되고자 하였다.

• 한국물환경학회지
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• 제27권4호
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• pp.391-396
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• 2011

Recently it revealed that urban runoff was one of the major source that contaminates the river, lake and estuary because it contains toxic compounds such as heavy metals and Poly Aromatic Hydrocarbons (PAHs) as well as suspended solids, organic compounds and nutrients. The engineered polymetric media in this research were developed for reducing pollutants in urban runoff and would be used to be charged in the storm water treatment equipment. The engineered media that were composed of the polypropylene was foamed to have the buoyancy and then shattered by mechanical for the efficient filtration. In this study, Spherical Expanded Polypropylene Media (SEPM), Crushed Polypropylene Media (CPM), Large Crushed Expanded Polypropylene Media (LCEPM), Small Crushed Expanded Polypropylene Media (SCEPM) were made from polypropylene. Surface characteristics of the developed media were determined by scanning electron microscopy analyses. Also, removal efficiencies of SS, $COD_{Cr}$ in the artificial road runoff and the bed headloss by media and particle pollutants captured by media were examined. Results on the surface characteristics of media indicated that SCEPM had the largest specific surface area, $0.80m^2/g$, the lowest specific gravity, 0.091, and the biggest porosity, 0.63, because of crushing the media at the process of manufacturing. And the SCEPM's removal efficiencies of TSS and $COD_{Cr}$ in the artificial road runoff were 92.9% and 83.6%, respectively and the headloss of SCEPM was the least of them.