• 지역연구
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• 제31권1호
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• pp.3-20
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• 2015

본 연구는 도시의 특정 기능이 도시규모에 의존하는지 혹은 도시 네트워크도에 의존하는지를 파악함으로서 네트워크 도시이론의 적용가능성을 검토하고자 하는데 주된 목적을 가지고 있다. 이를 위하여 본 연구에서는 2005년 및 2010년 전국 163개 시 군을 대상으로 실증분석을 수행하였다. 분석의 결과를 종합하면 다음과 같다. 규모기반은 제조업에 큰 영향을 미치는 것으로 나타났으며, 네트워크 기반은 주로 서비스업에 영향을 미치는 것으로 나타났다. 또한 시기의 흐름에 따라, 규모기반이 미치는 영향은 과거에 비해 점차 감소하는 반면, 네트워크기반이 미치는 영향은 서비스업을 중심으로 점차 증대되는 경향이 있음을 확인할 수 있었다. 본 연구에서는 새로운 시대의 담론으로서의 네트워크 도시이론의 적용 가능성을 실증적으로 분석하였다는 측면에서 그 의의를 갖는다고 할 수 있겠다.

• 대한건축학회논문집:계획계
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• 제35권12호
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• pp.105-114
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• 2019

The goal of this study is to quantitatively evaluate the effects of the additional construction of urban railroads. To this end, 1) establish accessibility as a measure of quantitative evaluation of construction effects; 2) select the 'Integration' of Space Syntax as a quantifiable indicator of accessibility; 3) represent the Seoul railroads as a network; 4) calculate the 'Integration' form the network before and after the additional construction of the urban railroads. By calculating the change of the 'Integration' of the individual nodes and the change of the sum of the 'Integration' of given zones, the change in accessibility of a particular node and the change in accessibility of a particular region were calculated. After analyzing the change in accessibility in nodes and areas as well, it was confirmed that the additional construction of urban railroads was improving accessibility as a whole of Seoul. It was also identified that there was a degree of difference in the extent of the accessibility change for the different areas. It is particularly noteworthy that changes occur in the accessibility ranking. While certain regions were improving relative rankings, others fell in rank. With this finding, it could be argued that active consideration of the areas in which the relative decline occurs is needed when the planned urban railroad is being built.

• 대한토목학회논문집
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• 제30권5B호
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• pp.479-486
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• 2010

신뢰성 있는 수문자료의 획득은 효율적인 물 관리를 위한 가장 기본적인 조건인 동시에 가장 필수적인 조건이다. 특히 최근 이상기후의 영향으로 빈번하게 발생하고 있는 도시홍수에 대응하기 위한 경보체계 등을 구축하는데 있어 사용자가 관측하고자 하는 임의 지점에서 유황자료의 획득은 매우 중요하다. 지속적인 하천정비 사업을 통해 외수범람에 의한 홍수 발생빈도는 점차 낮아지고 있지만, 하수관거의 노후화, 관리 소홀 등의 원인으로 내수배제가 원활하지 못해서 발생하는 내수침수로 인한 도시홍수는 지속적으로 발생하고 있다. 이러한 도시홍수 저감을 위해서는 도시배수시스템에 대한 지속적인 관리와 현황파악이 필수적이다. 본 연구에서는 CDMA(Code Division Multiple Access) 무선통신기술과 Bluetooth 근거리 무선통신기술을 사용하여 전문적인 지식이 없는 사용자라도 누구나 언제, 어디서든 도시배수시스템의 임의의 지점에서 유황을 파악하고, 배수관망에서는 유황 관측과 동시에 유출 경로 추적이 가능한 도시배수관망 유속측정 시스템의 개발을 목표로 하였다. 도시배수관망 유속측정 시스템은 세 단계로 구성되어 운영된다. 첫 번째 단계에서 ubiquitous floater를 사용하여 획득한 유황 정보를 서버로 전송하면, 두 번째 단계에서 서버 컴퓨터를 통해 도시 배수시스템의 현황을 판단하고, 마지막 단계에서 정보를 GUI(Graphic User Interface)를 통해 사용자에게 제공하게 된다. 개발된 도시배수관망 유속측정 시스템을 경기도 수원의 원천천에 위치한 배수관망에 적용하여 현장 실험한 결과, 도시 배수관리를 위해 필요한 정보들을 실시간으로 획득하고 관리할 수 있었다.

• 한국물환경학회지
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• 제33권6호
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• pp.617-625
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• 2017

Both domestic and overseas urban drainage systems have been actively researched to solve the problems of urban flash floods and the flood damage that is caused by local downpours. Recent urban planning has been designed to better manage the floods of decentralized rainfall-management systems, and the installation of green infrastructure and low-impact development (LID) facilities at national ministries has been recommended. In this study, we use the EPA SWMM model to construct a decentralized rainfall-management network for each small watershed, and we analyze the effect of the drainage-capacity improvement from the installation of the LID technologies in vulnerable areas that replaces the network-expansion process. In the design of the existing urban piping systems, it is common to increase the pipe size due to the increment of the impervious area, the steep terrain, and the sensitive entrance-ramp junction; however, the installation of green infrastructure and LID facilities will be sufficient for the construction of a safe urban drainage system. The applications of LID facilities and green infrastructure in urban areas can positively affect the recovery of the corresponding water cycles to a healthy standard, and it is expected that further research will occur in the future.

• ETRI Journal
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• 제35권5호
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• pp.775-785
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• 2013

Because of their exclusive features, millimeter wave directive mesh networks can be considered for small cell backhaul support in urban environments. For this purpose, a network of closely spaced stations has been considered with very directive line-of-sight links operating in the 60-GHz band. An attempt is made to evaluate channel response and interference behavior in such a network, taking into account the effect of building blockage. A simple grid of building blocks is considered as the propagation environment, and wave propagation is simulated using 2.5-dimensional (2.5D) ray tracing (2D with ground effect) to calculate the received signal at different nodes in the network. The results are compared with free space predictions and used to evaluate interference at all nodes in the channel and describe certain characteristics of links, such as the delay profile and the correlation length.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권5호
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• pp.1662-1681
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• 2015

The efficient send and receive of information in VANET improves the efficiency of the safety and traffic services advertisment and discovery. However, if the V2V is the only communication system used, the restrictions of the urban environment and network drop the performance of VANET. In order to improve the performance of the network, it is necessary to use V2I communication as well as V2V communication. Therefore, RSUs must be placed in the environment. However due to the high costs of placement, the full coverage of the environment would not be possible. Therefore, it is necessary to optimally install a limited number of RSUs in the environment.

• 한국환경복원기술학회지
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• 제11권6호
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• pp.11-25
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• 2008

In broad agreement on the need for forests in the city, researches on the urban forest are being actively carried out. Nonetheless, since these researches focus on functional usage within living spaces, finding methods for creation of urban forests and technical solutions have remained chief issues as a consequence. This paper, which attempts to historically examine the properties of the urban forest within living space, has the characteristics of researching basic angles for approaching the creation of contemporary urban forests. For this purpose Joseon Dynasty genre paintings, which represent living conditions of Joseon era, have been decided as theme of the paper. Particularly the focus was limited to genre paintings depicting trees, giving phenomenal observations. As a result, some remarkable characteristics emerged as functional urban forest, symbolic urban forest, topological urban forest, and appreciative urban forest. Urban forest within living space mainly appear as functional, showing an even distribution in small numbers rather than gathering in large groups. The following can be inferred regarding this and related to the setting up of the scope of, and creating of, contemporary urban forest : First, from the viewpoint of urban forest creation there is a need to study more subdivided and refined types of the urban forest and to actually realize these types. Second, from the viewpoint of urban forest usage, one needs to approach existing forests, ranging from small-scale including invididual trees, to mid-, large-, and super scale, as urban forests. In this, a network of major trees, and thereby a matrix of all trees formed by that network, will be formed. Third, from the viewpoint of urban forest improvement, approaches need to be based on planting trees in even distribution across the whole city.

• 디지털산업정보학회논문지
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• 제18권2호
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• pp.9-16
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• 2022

The nodes constituting the vehicle ad hoc network (VANET) are vehicles moving along the road and road side units (RSUs) installed around the road. The vehicle ad hoc network is used to collect the status, speed, and location information of vehicles driving on the road, and to communicate with vehicles, vehicles, and RSUs. Today, as the number of vehicles continues to increase, urban roads are suffering from traffic jams, which cause various problems such as time, fuel, and the environment. In this paper, we propose a method to solve traffic congestion problems on urban roads and demonstrate that the method can be applied to solve traffic congestion problems through performance evaluation using two typical protocols of vehicle ad hoc networks, AODV and GPSR. The performance evaluation used ns-2 simulator, and the average number of traffic jams and the waiting time due to the average traffic congestion were measured. Through this, we demonstrate that the vehicle ad hoc-based traffic congestion management technique proposed in this paper can be applied to urban roads in smart cities.

• 전기학회논문지
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• 제64권12호
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• pp.1796-1803
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• 2015

Unlike commercial LTE network, LTE-R railway network is arranged along a railroad track and the base stations of the network (RUs) are also installed on the waysides. For urban railway systems that are composed of underground tunnels, the leakage coaxial cables are widely used due to the radio propagation characteristics in tunnels. In theory, the tunnel sections are interpreted as the waveguide with blank spaces and for this reason, the tunnel sections are expected to be better than open ground sections in terms of the radio propagation characteristics. In this paper, we analyze the radio propagation characteristics based on this theory by replacing the leakage coaxial cables in the network with Yagi antennas. The test has been carried out in the 2.2km tunnel in the Daebul test track of KORAIL with 2.6GHz LTE-R Network. The LTE-R applicability in urban railways has been tested through the analysis on the radio propagation characteristics with the unmanned train operation system in Daebul tunnel.

• 대한토목학회논문집
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• 제2권3호
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• pp.33-41
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• 1982

본(本) 논문(論文)에서는 도로교통망(道路交通網)의 기하구조(幾何構造)를 정의(定義)하는 파라메타를 측정(測定)할 수 있도록 해석적(解析的) 접근방법(接近方法)을 개발(開發)하였다. 이를 위하여 시설수준상(施設水準上)의 계급(階級)을 갖는 격자형(格子形)의 도로망(道路網)을 선택(選擇)하였으며 통행(通行)의 기종점(起終點)이 균등(均等)히 배치(配置)된 동시에 통행거리(通行距離)의 분포(分布)가 기점(起點)의 위치(位置)에 독립(獨立)인 균질(均質)의 도시평면(都市平面)을 가상(假想)하였다. 본(本) 논문(論文)의 목적(目的)은 통행(通行)과 건설(建設)에 따른 도로(道路)의 총비용(總費用)을 최소화(最少化)할 수 있는 도시간선도로(都市幹線道路)의 최적간격(最適間隔)을 구(求)하는 데 있으며 여기에서 통행배분(通行配分)은 Wardrop의 제(第) 1 원칙(原則)에 입각(立脚)하였다. 본(本) 논문(論文)에서 제시(提示)된 방법(方法)은 효율적(効率的) 교통망(交通網)을 위한 일반화(一般化)된 접근(接近)의 틀이라고는 할 수 없으나 대안(代案)의 설정(設定)과 평가(評價)에서는 기본도구(基本道具)로 사용(使用)될 수 있으며 통행(通行)의 O-D 패턴과 비용(費用)의 크기가 주어지는 경우 적어도 질적(質的)인 측면(側面)에서 도시간선도로(都市幹線道路)의 최적간격(最適間隔)에 대한 개요(槪要)를 밝힐 수 있다.