• Title/Summary/Keyword: Urban noise

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Automatic Registration of Point Cloud Data between MMS and UAV using ICP Method (ICP 기법을 이용한 MSS 및 UAV 간 점군 데이터 자동정합)

  • KIM, Jae-Hak;LEE, Chang-Min;KIM, Hyeong-Joon;LEE, Dong-Ha
    • Journal of the Korean Association of Geographic Information Studies
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    • v.22 no.4
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    • pp.229-240
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    • 2019
  • 3D geo-spatial model have been widely used in the field of Civil Engineering, Medical, Computer Graphics, Urban Management and many other. Especially, the demand for high quality 3D spatial information such as precise road map construction has explosively increased, MMS and UAV techniques have been actively used to acquire them more easily and conveniently in surveying and geo-spatial field. However, in order to perform 3D modeling by integrating the two data set from MMS and UAV, its so needed an proper registration method is required to efficiently correct the difference between the raw data acquisition sensor, the point cloud data generation method, and the observation accuracy occurred when the two techniques are applied. In this study, we obtained UAV point colud data in Yeouido area as the study area in order to determine the automatic registration performance between MMS and UAV point cloud data using ICP(Iterative Closet Point) method. MMS observations was then performed in the study area by dividing 4 zones according to the level of overlap ratio and observation noise with based on UAV data. After we manually registered the MMS data to the UAV data, then compared the results which automatic registered using ICP method. In conclusion, the higher the overlap ratio and the lower the noise level, can bring the more accurate results in the automatic registration using ICP method.

Evaluation of the change in Geotechnical properties due to the Construction of Civil engineering Structure using HWAW Method (HWAW방법을 이용한 토목구조물 건설에 따른 하부 지반 물성 변화 평가)

  • Park, Hyung-Choon;Noh, Hee-Kwan;Park, Byeong-Cheol;Kim, Min-Su
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.03a
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    • pp.182-187
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    • 2010
  • In the various fields of Civil Engineering, shear modulus is very important input parameters to design many constructions and to analyze ground behaviors. In general, a shear wave velocity profile is decided by various experiments before constructing a structure and, analysis and design are carried out by using decided shear wave velocity profile of the site. However, if civil structures are started to construct, the shear wave velocity will be increased more than before constructions because of confining pressure increase by the load of structure. The evaluation of the change in shear wave velocity profile is used very importantly when maintaining, managing, reinforcing and regenerating existing structures. In this study, a non-destructively geotechnical investigation method by using the HWAW method is applied to an evaluation of change in properties of the site according to construction. Generally, the space for experiments is narrow when underground of existing or on-going structures is evaluate, so a prompt non-destructive experiment is required. This prompt non-destructive experiment would be performed by various in-situ seismic methods. However, most of in-situ seismic methods need more space for experiments, so it is difficult to be applied. The HWAW method using the Harmonic wavelet transforms, which is based on time-frequency analysis, determines shear wave velocity profile. It consists of a source as well as short receiver spacing that is 1~3m, and is able to determine a shear wave velocity profile from surface to deep depth by one test on a space. As the HWAW method uses only the signal portion of the maximum local signal/noise ratio to determine a profile, it provides reliability shear modulus profile such as under construction or noisy situation by minimizing effects of noise from diverse vibration on a construction site or urban area. To estimate the applicability of the proposed method, field tests were performed in the change of geotechnical properties according to constructing a minimized modeling bent. Through this study, the change of geotechnical properties of the site was effectively evaluated according to construction of a structure.

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A Study on Organic-Inorganic Hybrid Sound Absorbing Materials Using by Recycling Gypsum (재활용 석고 부산물을 이용한 유무기 하이브리드 흡음재 개발 연구)

  • Shin, Hyun-Gyoo;Jeon, Bo-Ram;Ha, Joo-Yeon;Jeon, Chan-Soo
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.5 no.4
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    • pp.481-487
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    • 2017
  • The purpose of this study is to develop the hybrid sound-absorbing materials that is made from organic polyurethane sponge impregnated with inorganic binder solutions. The inorganic slurry which is made from ${\alpha}$-hemihydrate gypsum mixed with 60% water, and various additives including plasticizer are used as binder. The test specimens are prepared and tested for sound absorption performance by the impedance tube methods. From the test results, noise reduction coefficient(NRC) of development materials specimen bound by the inorganic binder slurry is 0.41. They are 2 times or more higher than commercial products specimens bound by organic materials only which have NRC values in the range of 0.14 to 0.28. The polyurethane sponge specimens impregnated with inorganic gypsum slurry binder have a good balance between performance and cost, and have proper properties in density, thermal conductivity, non-combustible, and absence of harmful substances as sound-absorbing internal boards for noise barrier wall. It is apparent that the good sound absorption materials can be produced according to the optimum mix design that is recommended from this study.

Semi-Automatic Method for Constructing 2D and 3D Indoor GIS Maps based on Point Clouds from Terrestrial LiDAR (지상 라이다의 점군 데이터를 이용한 2차원 및 3차원 실내 GIS 도면 반자동 구축 기법 개발)

  • Hong, Sung Chul;Jung, Jae Hoon;Kim, Sang Min;Hong, Seung Hwan;Heo, Joon
    • Journal of Korean Society for Geospatial Information Science
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    • v.21 no.2
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    • pp.99-105
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    • 2013
  • In rapidly developing urban areas that include high-rise, large, and complex buildings, indoor and outdoor maps in GIS become a basis for utilizing and sharing information pertaining to various aspects of the real world. Although an indoor mapping has gained much attentions, research efforts are mostly in 2D and 3D modeling of terrain and buildings. Therefore, to facilitate fast and accurate construction of indoor GIS, this paper proposes a semi-automatic method consisting of preprocessing, 2D mapping, and 3D mapping stages. The preprocessing is designed to estimate heights of building interiors and to identify noise data from point clouds. In the 2D mapping, a floor map is extracted with a tracing grid and a refinement method. In the 3D mapping, a 3D wireframe model is created with heights from the preprocessing stage. 3D mesh data converted from noise data is combined with the 3D wireframe model for detail modeling. The proposed method was applied to point clouds depicting a hallway in a building. Experiment results indicate that the proposed method can be utilized to construct 2D and 3D maps for indoor GIS.

A Case Study on the Construction at Near Verge Section of Secure Objects Using Electronic Detonators (전자뇌관을 이용한 보안물건 초근접구간 시공 사례)

  • Hwang, Nam-Sun;Lee, Dong-Hee;Lim, Il-soo;Kim, Jin-soo
    • Explosives and Blasting
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    • v.37 no.2
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    • pp.22-30
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    • 2019
  • On sites where explosives are used, the effects of noise and vibration produced by the blast wave are subject to a number of operational restrictions. Recently, the number of civil complaints has increased and the standard of environmental regulations on secure goods has been greatly tighten. Therefore, work is generally carried out by machine excavation in case of close proximity of safety thing. Machine excavation methods have the advantage as reducing noise and vibration compared to blasting methods, but depending on the conditions of rock intended to be excavated, they are sometimes less constructive than planned. In general, the closer a rock type is to hard rock, the less constructible it becomes. In this paper, we are going to explain the construction of a construction section with a close proximity to a safety thing using electronic detonators. While the project site was designed with a machine excavation methods due to the close(9.9m) proximity of safety thing(the railroad), construction using electronic detonators was reviewed as an alternative method for improving rate of advance time and construction efficiency when expose to hard rock. Through blasting using electronic detonators, construction and economic efficiency were maximized while minimizing impact on surrounding safety things. Because $HiTRONIC^{TM}$, which is produced by Hanwha, has innovative stability and high explosion reliability, it is able to explode with high-precision accuracy. Electronic detonators are widely used in construction sites of railway or highway, other urban burrowing areas and large limestone mines.

Study on the Bearing Capacity of Helical Pile through Field Load Tests (현장재하시험을 통한 헬리컬파일의 지지력에 관한 연구)

  • Kwon, Gi-Ryeol;Jang, Jeong-Wook;Cho, Song-Hyun
    • The Journal of the Korea Contents Association
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    • v.20 no.11
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    • pp.669-675
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    • 2020
  • This research has focused on comparing the capacity predicted by the theoretical formula with the one measured by field load tests to examine characteristics of the bearing capacity of a helical pile. The helical pile is featured by a central shaft with one or more helical-shaped bearing plates. Being established by a small rotary attached to an excavator that applies toque, the helical piles can be readily constructed at narrow sites, especially in an urban area with relatively less noise than the others requiring driving and excavation. Although many cases of the helical pile constructions can be recently found, the bearing capacity of the pile has been limitedly studied. To this end, this contribution analyzes and presents comprehensive results of the ten field loading tests with an application of different parameters depending on joint condition and specification of the helical piles, and types of tests and grouting.

Vehicular Pitch Estimation Algorithm with ACF/IMMKF Based on GPS/IMU/OBD Data Fusion (GPS/IMU/OBD 융합기반 ACF/IMMKF를 이용한 차량 Pitch 추정 알고리즘)

  • Kim, Ju-won;Lee, Myung-su;Lee, Sang-sun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.9
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    • pp.1837-1845
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    • 2015
  • The longitudinal velocity is necessary for accurate vehicular positioning in urban environment. The pitch angle, which is a road slope, should be calculated to acquire the longitudinal velocity. However, it is impossible to consider very accurate pitch, when using a sensor and an algorithm. That's why process noise and positioning stimation error of IMU should be adjusted to the driving environment and fuse GPS, OBD data with ACF which consist of AKF, CF in this paper. Then, final pitch angle which is appropriate for driving environment is estimated by IMMKF in order to optimize the system model according to road slope models.

Research on Characteristics and Actual Cases of Temporary Street Furniture -Focused on the Tentative Construction and Screen Fences at Construction Sites- (한시적 스트리트 퍼니처의 사례와 특성에 관한 연구 - 공사장 가설울타리와 가림막을 대상으로 -)

  • Bae, Hyun-Mi
    • Journal of the Korea Furniture Society
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    • v.20 no.1
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    • pp.21-30
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    • 2009
  • This research is conducted on temporary street furniture, which is one of the significant factors that comprise the street landscape in modem cities. The primary purpose of this research is to present the guidance on direction of planning by examining the design and installation types of construction and screen fences usually established at construction sites for buildings, roads, parks and etc. The results are as follows: 1. The construction and screen fences at construction sites of urban areas used to be a mere tentative facility to prevent noise and safety accidents but have now incremented their roles to serve not only as a functional but also as an aesthetic element with a city view and harmonization with other elements taken into consideration. In particular, it is noticeable that, based on its unique feature of tentativeness, its role has developed to serve as street furniture that adds variability to the modem city. 2. There are two different types of screen fences: blackout type and transparent type. The transparent screen turns out to be used a lot at the construction site of building a skyscraper or differentiated building in downtown city area or in places where there are buildings of similar types and shapes located along the street in the vicinity of the construction site. 3. The actual cases of adopting the tentative construction and screen fences all at the same time as a single unit have been found in historically and culturally significant architectures with the screen design used to demonstrate the view after completion of construction or the characteristics of the architecture.

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A Study on the Design Criteria for Urban Small Parks (설계평가(設計評價)를 통(通)한 도시소공원(都市小公園)의 설계기준(設計基準)에 관(關)한 연구(研究))

  • Ahn, Kun Yong;Kim, Kwi Gon;Im, Seung Bin
    • Journal of Korean Society of Forest Science
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    • v.68 no.1
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    • pp.18-31
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    • 1985
  • Users' satisfaction and behavior at five mini parks in the central area of Seoul City were investigated under the encironmental design evaluation framework. The major findings are as follows; 1) The major user group is a student group with the ages ranging from 15 to 24. 2) Half of the users spend 20 to 60 minutes in these parks. 3) According to the multiple regression analysis, the variables related to the satisfaction in daytime are noise level, sunshine, plants, crowding, and surface slope, where those in nighttime are quality of surrounding buildings, turf area, lighting, shade, and sculpture or fountain. 4) According to the free response, the basic needs inmini parks are shade for rest and such amenity facilities as bench, trash basket, and drinking fountain. In addition to these basic needs, users prefer such visually pleasing objects as sculpture and fountain.

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A Study of Explosive Jet-cutting Technology by Linear Shape Charges (성형폭약에 의한 폭발절단기술에 관한 연구)

  • 이병일;박근순;공창식;김광태
    • Tunnel and Underground Space
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    • v.10 no.4
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    • pp.516-525
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    • 2000
  • Recently, the demand for pollution-free demolition work of old reinforced concrete and steel structure has rapidly increased as the redevelopment of urban area has been accelerated. This study deals with linear shape charges for explosive jet cutting on steel structure. We have tested material and shape of steel structure, characteristics of thickness and strength, shape of linear shape charges, type of shape charges, cumulative charges, type of liner, stand-off distance, detonation method. effect of sound and vibration by air blast in explosive jet cutting method. So, We developed linear shape charges in order to take advantage of optimum explosive jet cutting condition. Shape charges were made of PETN explosives. We obtained the experimental formula to decide the amount of explosive needed for thickness of steel structure plate. There are prospects for application of the explosion curving technology under the open space conditions for dismantling the steel structure and steel bridge, scrapped old boats, which are going out of service.

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