• Title, Summary, Keyword: slope net

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A Study on Revgetation Character for Environment Factor of Slope (비탈면 입지조건에 따른 녹화 특성에 관한 연구)

  • Woo, Kyung-Jin;Jeon, Gi-Seong
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.8 no.5
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    • pp.47-55
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    • 2005
  • This study was conducted to suggest revegetation character for environment factor of slope. Field test carried out for the man-made slope with three types(0.5cm no net, 3.0cm no net, 3.0cm net) revegetation methods in Hwaseong. Test revegetation plants were Festuca arundinacea, Lolium perenne, Lespedeza cyrtobotrya and Indigofera pseudo-tinctoria M. The result of this study can be summarized as follows; 1. The soil hardness, the soil acidity, and the soil humidity of three types(0.5cm no net, 3.0cm no net, 3.0cm net) revegetation methods were at a suitable value for plants growth. 2. All plant growth index(seedling number, ground coverage, plant height, plant weight, etc) of south slope were better than north slope. But plant growth index of net plots were similar to no net plots. 3. For washout investigation, washout quantity of north slope was plentifully measured from south slope, and 1 amount of rainfall will be big was visible appears plentifully.

A Study on Vegetated Embankment Slope Reinforcement Using A Synthetic Resine Based Net-hose System (합성수지 소재 네트호스 시스템을 이용한 성토사면 녹화 보강에 대한 연구)

  • Baek, Yong-Gi;Lee, Min-Kyu;Ahn, Jaehun;Oh, Jeongho
    • Journal of the Korean Society for Advanced Composite Structures
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    • v.6 no.3
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    • pp.8-13
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    • 2015
  • This study investigates the application of a synthetic resine based net-hose system to sustain vegetated embankment slope reinforcement. The net-hose system is designated to improve water supply to the vegetation that can suffer the lack of water in case of extreme drying condition or rock slope where water supply is relatively insufficient to ensure the growth of vegetation. A series of laboratory tests were conducted to check the structural adequacy and effectiveness of net-hose system. The results indicated that the model slope equipped with net-hose system seemed to provide better water supply resulting in more vegetated areas and higher matric suction due to active water uptake capacity, which might be contributed to greater shear strength of slope surface. A limited numerical analysis was conducted to verify the effect of water uptake on vegetated root system that generally yields better slope stability.

Compensation Characteristics of WDM Signals Depending on RDPS Slope of Fiber Span in Dispersion Managed Optical Transmission Links (분산 제어 광전송 링크에서 중계 구간의 RDPS 기울기에 따른 WDM 신호의 보상 특성)

  • Lee, Seong-Real
    • Journal of Advanced Navigation Technology
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    • v.17 no.2
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    • pp.208-217
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    • 2013
  • The optimal residual dispersion per span (RDPS) slope is induced through the analyses of the compensation characteristics of the wavelength division multiplexed (WDM) channels depending on RDPS slope in the optical links with a dispersion management (DM) and an optical phase conjugation. The simulation results show that the effective launch power of WDM is more increased and the performance difference between the channels is more decreased as RDPS slope is more increased. The simulation results also show that the effective net residual dispersion (NRD) range is more increased as RDPS slope is more increased, and consequently, it is more advantageous to use the large RDPS slope for implementing the flexible optical links.

Modeling of Petri-Net for an Simulation of Cut Slope Test on GIS (GIS 기반 절토 사면 시뮬레이션을 위한 Petri-Net 모델링)

  • Lee, Hong-Ro;Lee, Jae-Bong
    • Journal of the Korean Association of Geographic Information Studies
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    • v.15 no.2
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    • pp.1-11
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    • 2012
  • Due to a heavy rain resulted from the global environmental change, collapse accidents happen annually and it is a tendency to increase the loss of life and economy. Thus, measures for the collapse of slope are required. If the slope can be simulated before cutting, the collapse can be predicted, and also the accident of the collapse can be minimized at the cost of recovery. This paper presents a simulation method of a slope which is important in cutting. The method is modeling and designing using Petri-Net and is implemented in the Windows XP using Arc GIS. Therefore, by means of cutting and reclamation based on GIS, this paper can contribute to saving a lot of time and money.

Studies on the Behaviour of Fish Schools in the Main-net of a Large Scale Set-net Using Scanning Sonar - I - The Behaviour of Small Schools of Sardine Sardinops Melanosticta in the Main-net - (소나 관찰에 의한 대형정치망내 어군행동의 연구 - I - 입망한 정어리소형군의 행동 -)

  • 김문관
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.31 no.1
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    • pp.1-7
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    • 1995
  • The fish behavior survey in the main-net of a large scale-net was carried out in relation to the catching function of the set-net. at Kishihata set-net in Japan during the period from January 29th to February 22th 1992. The results obtained are summarized as follows; 1. The greatest number of schools observation in the main-net occurred between 17 : 00hrs and 18 : 00hrs. after which the schools suddenly disappeared. This result show that the schools did not stay in the main-net. but immediately moved through into the bag-net or left the main-net. 2. The course of movement of the small schools of sardine in the main-net was in a straight line to the slope-net. However. upon arrived at the slope-net the school turned around. away from the slope-net and went directly towards the playground. 3. The majority of small schools of sardine in the main-net were estimated to move with the mode velocity 25cm/sec. however the maximum velocity were recorded 80cm/sec.

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Estimation of Internal Friction Angle by the Back Analysis on Collapsed Rock Slope (붕괴된 암반사면에서 역해석에 의한 내부마찰각의 추정)

  • 이달원;김갑중
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.45 no.6
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    • pp.172-182
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    • 2003
  • In this study, the back analysis was performed by means of stereo-net, plane failure and block failure method to collapsed fields among the rock slopes designed by standardized criterion, and the internal frictions from the back analysis were compared with those used to reinforcement design. It was concluded that in the result of the analysis by means of stereo net, plain failure and block failure methods, the internal frictions used to re-design of collapsed slope underestimated 10$^{\circ}$, 5$^{\circ}$ and 10$^{\circ}$ in average. At present, the internal friction on the design is used the experience value according to the state of weathering, but internal friction angle by the back analysis on collapsed slope with various methods were more reliable values than those from the present method. And it was concluded that re-design was made extravagantly because the internal friction used to re-design for reinforcement of the collapsed slope was less than back analysis.

A Case Study on Stability Evaluation of Road Slope based on Geological Condition (지질조건에 따른 도로사면 안정검토에 대한 사례연구)

  • Park, Chal-Sook;Kim, Jae-Hong
    • The Journal of Engineering Geology
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    • v.17 no.4
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    • pp.577-587
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    • 2007
  • The length of study area was about 450m, and it was shown the geological condition of distinguished change of rock by cutting slope. In order to establish a slope stability, we carried out an engineering geological investigations about rock constituent, rock structure and a direction of discontinuous plane. The study area was divided into six section considered by direction of cutting slope, height of slope and geological condition. Analysis of cutting slope stability was carried out with stereo-graphic projection method by DIPS program which was feasible of stability analysis with geometrical correlation for a direction of discontinuous plane and direction of cutting slope. From analysis of cutting slope stability considered by construction, stability and economical efficiency, the slope stability countermeasures such as a high tensile wire net, slope protection method and enhanced retaining wall were established and operated which minimized effect caused by lower end of road on a relaxation of huge rock.

A Study on Slope Reinforcement Method for Control of Rockfall and Small Scale Failure (낙석 및 소규모 붕괴 방지를 위한 사면보강방안에 관한 연구)

  • Lee, Seung-Ho;Hwang, Young-Cheol;Noh, Heung-Jae;Sim, Seok-Rae
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.796-805
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    • 2005
  • Most rockfall prevention net among the rockfall prevention equipment that is constructed in around the road is actuality lack of function by quantitative research insufficiency etc.. Most of rockfall prevention net are composed to setting needle, perpendicular and horizontal wire rope and wire net. Also, function of rockfall prevention net depend on setting needle and the wire net and perpendicular and horizontal wire rope are fixed by setting needle. when unreasonable load is offered setting needle, rockfall prevention net can lose the function and happen continuous falling off of rockfall prevention net. Because rockfall prevention net have a such structural defect, improvement had been required in reply. So in this paper, spot application of Rock Bolt & Net Connection method and falling rock support ability are estimated by numerical analysis. As a result, when Rock Bolt & Net Connection Method is applied to cutting slope, decreases of stress and displacement is examined than current rockfall prevention net.

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Studies on the Behaviour of fish Schools in the Main-net of a Large Scale Set-net using Scanning Sonar - II - The Behaviour of Large Schools of Sardine, Sardinops mwlanosticta in and around the Set-net - (소나 관찰에 의한 대형정치강내 어군행동의 연구 - II - 정치망내외에서 정어리대형군의 행동 -)

  • Kim, Mun-Kwan;Inoue, Yoshihiro;Park, Jeong-Sik
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.31 no.1
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    • pp.8-14
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    • 1995
  • The behaviour of large school of sardine Sardinops melanosticta in and around the set-net were analyzed from sonar image recordings. The survey was conducted at Kishihata set-net in Japan from January 29th to February 22th 1992. The results obtained are summarized as follows ; 1. When large schools of sardine moved along the outside of the set-net. the shape of the school gradually changed, that was the front part extended forward in the direction of movement and the rear part concentrated in the same direction such that the school retained its original shape. 2. When large school of sardine entered the main-net of the set-net. the school was decentralized directly to the slope-net. to the central part. and to the opposite side, and then the fish school was concentrated as it moved directly to the slope-net. 3. When the size of the front part of the fish school enlarged. the maximum recorded moving speeds were 176cm/sec and 277cm/sec for schools inside and outside the set-net, respectively.

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Net Shapes of the Model Pound net according to Added Sinker - In case of the upperward flow with fish court net - (부가중량추에 따른 모형 정치망의 형상변화 - 운동장이 湖上側인 경우 -)

  • Yun, Il-Bu;Lee, Ju-Hee;Kwon, Byeong-Guk;Yoo, Jae-Bum;Cho, Young-Bok
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.41 no.1
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    • pp.17-26
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    • 2005
  • There are several problems in the commercial pound net in the heavy tide ; the breaking and loss of net, steeply variation of net shape and decreasing of fishing efficiency, etc. In order to solve these problems, we introduced method of added sinker used to coastal cultivating cage of Japan and investigated the possibility of application to the Korean pound net. The results are obtained as follows; 1. In case of the upperward flow with fish court net, tension of the frame line was increased about 10${\sim}$25% than that of prototype according to the added sinker from 1.3gf to 5.2gf. The tension of A-type and B-type was similar to the case of the prototype, the tension of C-type and D-type was increased about 10${\sim}$15% than that of prototype. 2. The variation of deformed angle of fish court net was from 0$^{\circ}$ to 70$^{\circ}$ and that of the slope net was from 0$^{\circ}$ to 64$^{\circ}$ and that of the second bag net was from 0$^{\circ}$ to 46$^{\circ}$ and the depth of the second bag net was increased about 10% when the added sinker was changed from 1.3gf to 5.2gf. The depth of the first bag net and the second bag net were decreased about 50% than that of initial depth. 3. For the deformed angle of fish court net according to the attached point of the added sinker, A-type and B-type were decreased about 25% and 10% than the prototype, respectively. C-type was similar to the case of the prototype and D-type was increased about 15% than that of the prototype. The depth of slope net became deep in turn of A-type, B-type, C-type and D-type. For the depth of the second bag net, A-type, B-type, C-type and D-type were increased about 10${\sim}$15% than that of prototype. The depth of the slope net was changed from 0$^{\circ}$ to 63$^{\circ}$ and that of the second bag net was changed from 0${\sim}$44$^{\circ}$ according to the increase of velocity. 4. The optimal weight of added sinker was about 2.6${\sim}$3.6gf and the optimal attached point of added sinker was the case of C-type and D-type.