• 한국농촌건축학회논문집
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• 제5권2호
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• pp.10-19
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• 2003

The purpose of this study was to analyze the formation and change of road-block-lot of the old inner city in cheongju The result of this study are as follows; (I)Among others a system roads of in around the old castle in cheongju city is most of feature north and south direction of road. Lot system is organic relations of north and south direction of road. Therefore, urban tissue in around the old castle in cheongju city is established order road system keep on the change of expansion urban tissue. (2) Block type classified into non-division, 2division and over 3division. (3) The square block remains mostly in Cheongju old castle, two-division block was around south of castle. And block of the grid-form street system divided into over 3 division. Through the guideline about characteristic of block type, residential area should be developed as a characteristics area in the urban area.

• 한국자동차공학회논문집
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• 제20권2호
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• pp.85-89
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• 2012

This paper presents a study on the system identification of the in-situ output shaft torque measurement system using a non-contacting magneto-elastic torque transducer installed in a vehicle drivline. The frequency response (transfer) function (FRF) analysis is conducted to interpret the dynamic interaction between the output shaft torque and road side excitation due to the road roughness. In order to identify the frequency response function of vehicle driveline system, two power spectral density (PSD) functions of two random signals: the road roughness profile synthesized from the road roughness index equation and the stationary noise torque extracted from the original torque signal, are first estimated. System identification results show that the output torque signal can be affected by the dynamic characteristics of vehicle driveline systems, as well as the road roughness.

• 산업경영시스템학회지
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• 제29권1호
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• pp.56-62
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• 2006

This paper is concerned with a six sigma application to non-manufacturing process. Based on the comparison to manufacturing process, non-manufacturing process has some specific characteristics. The main focus of this study is to introduce an empirical case study on the implementation of DMAIC procedures for non-manufacturing process. We use a simple and practical road map which consists of 13 steps. Some fundamental rules for DMAIC implementation in six sigma projects are also introduced.

• 상하수도학회지
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• 제28권3호
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• pp.265-276
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• 2014

In this study, we suggested 4 plans to reduce non-point pollutant sources in Dongcheon and analyzed their controlling effects by water quality modeling, XP-SWMM. To do this we identified the influx of non-point pollutant sources to the initial rainwater through the water quality survey in the river and analyzed the causes of them at major locations, and suggested 4 kinds of plans reducing non-point pollutant sources. Plans reducing the non-point pollutant sources through cleaning the industrial road around the river(plan A), through a separate treatment facilities like the gutter(plan B), through installing treatement facilities(plan C), or through combing plan B and C(plan D) were analyzed using XP-SWMM model. The analysis showed that plan A, B, C and D reduced non-point pollutant sources average 21.7 %, 24.7 %, 49.3 %, 56.7 % respectively. Therefore, the water quality pollution in Dongcheon due to the influx of non-point pollutant sources is considered to be reduced effectively though cleaning the road, installed at the exits of paddy or factory basins, invasion type facilities or equipment-type facilities.

• 대한전자공학회논문지SP
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• 제48권4호
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• pp.86-97
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• 2011

본 논문에서는 칼라분류 및 방향성 에지정보의 클러스터링과 이들의 통합에 의한 새로운 도로영역 및 차선검출 알고리즘을 제안한다. 도로영역 및 차선을 하나의 인식대상 물체로 취급하고, 통계적 파라미터의 반복 최적화에 의한 칼라정보의 클러스터링을 수행해서 검출과 인식을 위한 초기정보로 사용한다. 다음으로, 칼라정보가 갖는 물체인식 의 한계를 개선하기 위해 에지정보를 검출하고, 관심영역(Region Of Interest for Lane Boundary(ROI-LB))의 추출과 ROI-LB 영역에서 방향성 에지정보의 검출과 클러스터링을 수행한다. 칼라분류 및 에지 클러스터링의 결과를 통합해, 이들 각각의 정보가 갖는 특징을 이용함으로서 도로환경에 적합한 도로영역 및 차선을 검출할 수 있도록 한다. 제안방법은 도로와 차선에 관한 파라미터릭 수학적 모델을 사용하지 않고 칼라 및 에지의 클러스터링 정보에 의한 non-parametric 방법으로 다양한 도로 환경에 유연한 대응이 가능한 장점을 갖는다. 본 제안방법의 유효성을 입증하기 위해 상이한 촬상조건 및 도로환경에서의 영상에 대한 실험결과를 제시한다.

• Journal of Platform Technology
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• 제9권4호
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• pp.3-9
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• 2021

이 논문에서는 차량 또는 도로 인프라 센서에 의해 검출된 도로상의 각 객체들 간의 상황인지를 효과적으로 하기 위해서 그래프 데이터 모델을 도입한다. 제안하는 방법은 도로상의 각 객체들을 그래프의 정점(Vertex)로, 객체들 간의 관계를 그래프의 간선(Edge)로 모델링하여 그래프 데이터베이스를 구축하고, 객체의 속성과 간선의 속성을 실시간으로 업데이트한다. 이때 간선으로 표현되는 객체들 간의 관계는 각 객체의 위치, 이동방향, 이동속도 등을 고려하여 객체들 간에 근접 가능성이 있을 경우 설정한다. 또한, 제안하는 그래프 모델링 방법을 통해 표현한 도로 객체 그래프 데이터베이스를 실시간으로 업데이트하기 위해 그래프 정점과 간선에 대한 공간 색인 기법을 제안한다. 제안하는 색인기법 기반의 그래프 데이터베이스 업데이트 성능을 평가하기 위해서 색인 없이 업데이트하는 방법과 비교하였으며 비교결과 제안하는 방법이 10배 더 빠르게 업데이트를 할 수 있음을 확인하였다.

• 전기학회논문지
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• 제60권4호
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• pp.885-891
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• 2011

In this paper, we studied dc leakage current properties analysis of LED lamps of road and landscape lighting when leakage current appeared in dc power line. Generally, converter of LED lighting is divides to insulated type and non-insulated type according to components. When electric leakage happened in AC power line, earth leakage breaker(ELB) senses leakage current and interrupts electric circuit. In dc power source, We need experimental verification about dc electric leakage for electricity safety. In normal wiring conditions and in the water, in case of using insulated type of converter, dc leakage current did not occur. However, in case of using non-insulated type of converter, dc leakage current occurred and passed through into the ground. We found that there is a hazard of electric shock by dc leakage current. We expect that the results of these studies would be helpful for electrical safety of LED lamps for road and landscape lighting.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권7호
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• pp.3369-3385
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• 2019

There are various research challenges in vehicular ad hoc networks (VANETs) that need to be focused until an extensive deployment of it becomes conceivable. Design and development of a scalable routing algorithm for VANETs is one of the critical issue due to frequent path disruptions caused by the vehicle's mobility. This study aims to provide a novel road-aware routing protocol for vehicular networks named as Two-level hierarchical Hybrid Road-Aware (THERA) routing for vehicular ad hoc networks. The proposed protocol is designed explicitly for inter-vehicle communication. In THERA, roads are distributed into non-overlapping road segments to reduce the routing overhead. Unlike other protocols, discovery process does not flood the network with packet broadcasts. Instead, THERA uses the concept of Gateway Vehicles (GV) for the discovery process. In addition, a route between source and destination is flexible to changing topology, as THERA only requires road segment ID and destination ID for the communication. Furthermore, Road-Aware routing reduces the traffic congestion, bypasses the single point of failure, and facilitates the network management. Finally yet importantly, this paper also proposes a probabilistical model to estimate a path duration for each road segment using the highway mobility model. The flexibility of the proposed protocol is evaluated by performing extensive simulations in NS3. We have used SUMO simulator to generate real time vehicular traffic on the roads of Gangnam, South Korea. Comparative analysis of the results confirm that routing overhead for maintaining the network topology is smaller than few previously proposed routing algorithms.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.1398-1400
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• 1996

In this paper, a method of the decision of the road direction for ALV(Autonomous Land Vehicle) road following by region-based segmentation is presented. The decision of the road direction requires extracting road regions from images in real-time to guide the navigation of ALV on the roadway. Two thresholds to discriminate between road and non-road region in the image are easily decided, using knowledge of problem region and polygonal approximation that searches multiple peaks and valleys in histogram of a road image. The most likely road region of the binary image is selected from original image by these steps. The location of a vanishing point to indicate the direction of the road can be obtained applying it to X-Y profile of the binary road region again. It can successfully steer a ALV along a road reliably, even in the presence of fluctuation of illumination condition, bad road surface condition such as hidden boundaries, shadows, road patches, dirt and water stains, and unusual road condition. Pyramid structure also saves time in processing road images and a real-time image processing for achieving navigation of ALV is implemented. The efficacy of this approach is demonstrated using several real-world road images.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.17-22
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• 2002

This paper is concerned with a local detection of road on an airborne SAR image. The roads can be characterized by their geometry and radiometry. Roads are assumed as linear, thin, and elongated objects that are darker than their surroundings on an airborne SAR image. With these assumptions, a series of morphological filters are applied and tested successively. This approach is simple and almost non parametric and has been successfully applied to an airborne SAR image.