• Journal of Korean Society for Geospatial Information Science
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• v.11 no.1 s.24
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• pp.21-28
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• 2003

This study was aimed at suggest a proper planning method to select a optimal forest road network in mountains forest using GIS(Geographic Information System). To examine the field applicability, the method was applied to the National Forest at Mt. Kumsan in Namhae-gun, Gyungsangnam-do. The main results from altogether six alternative road route plans were derived from these criteria obtained the alternative route plan No.2 has two layout criteria, longitudinal gradient and earth work volume, and it showed similar pattern of existing forest road network which was designed mainly ground slope and longitudinal gradient. The alternative route plan No.6 has four criteria, longitudinal gradient, earth work volume, investment effect and landscape impact. It was different for the lowest forest road density among the alternatives and the pattern of the forest road layout was radial form, which was also quite different to other alternatives. For optimal forest road network planning, GIS provide the efficient and resonable solutions for decision making to provide the support for evaluation about various alternative road networks. If detailed inventory and relevant data are provided and also clear and objective indicators for evaluations are set up, it could be applied to preliminary analysis and detail planning stage to prevent undesirable effect such the land slide and soil erosion due to inadequate planning for forest road network.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 2000.04a
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• pp.89-96
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• 2000

Landslide damage comprise most part of the damages from the earthquake and it only causes the damage to lives and structures directly but also cease the operation of social system by road or lifeline failure. For these reasons hazard assesment on the landslides has been recognized very important. And hazard maps have been used to visualize the hazard of the landslide. In this study as first step for application of hazard map to domestic cases hazard maps are made for the Ul-Joo Ul-san Korea, Where the Yan-san faults are located. For building hazard maps the degree of hazard are evaluated based on Newmark displacement and the resulting maps are constructed by GIS technique. In hazard assesment maximum ground acceleration obtained from attenuation equation of wave propagation and design earthquake acceleration suggested by Ministry of construction are used for acceleration term. Hazard maps are made by GIS programs Arc/Info and Arc/View based on the digital maps and data from lab tests and elastic wave surveys The maps show the possible landslide regions significantly and the displacements of slide are proportional to the slope angles.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.150.1-150
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• 2001

This paper introduces a real time inspecting and monitoring system by using wireless communication and image processing technique. The communication system is developed by using 80c196kc microprocessor and it has data acquisition function for several kinds of sensors such as pluviometer, temperature, tension meter, elinometer and so on. The image processing method adopts Lalacian of Gaussian operator and least square method to extract line features for the captured images and uses a relaxation matching algorithm based in global structure constraint satisfaction to distinguish the matching error for those features. When the algorithm is processed, motion parameters of displacement area and its direction are computed. Once movement is recognized ...

• Geomechanics and Engineering
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• v.18 no.4
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• pp.353-362
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• 2019

Soil-rock mixture (S-RM) is an inhomogeneous geomaterial that is widely encountered in nature. The mechanical and physical properties of S-RM are important factors contributing towards different deformation characteristics and unstable modes of the talus slope. In this paper, the equivalent substitution method was employed for the preparation of S-RM test samples, and large-scale triaxial laboratory tests were conducted to investigate their mechanical parameters by varying the water content and confining pressure. Additionally, a simplified geological model based on the finite element method was established to compare the stability of talus slopes with different strength parameters and in different excavation and support processes. The results showed that the S-RM samples exhibit slight strain softening and strain hardening under low and high water content, respectively. The water content of S-RM also had an effect on decreasing strength parameters, with the decrease in magnitude of the cohesive force and internal friction angle being mainly influenced by the low and high water content, respectively. The stability of talus slope decreased with a decrease in the cohesion force and internal friction angle, thereby creating a new shallow slip surface. Since the excavation of toe of the slope for road construction can easily cause a landslide, anti-slide piles can be used to effectively improve the slope stability, especially for shallow excavations. But the efficacy of anti-slide piles gradually decreases with increasing water content. This paper can act as a reference for the selection of strength parameters of S-RM and provide an analysis of the instability of the talus slope.

• Journal of the Korean Institute of Landscape Architecture
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• v.27 no.5
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• pp.1-11
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• 2000

The aim of this study is to suggest guidelines of bicycle lanes in terms of landscape architecture with special reference to Kyongju. The research is mainly based on landscape satisfaction factors analysis regarding 16 variables and 10 slide photos of bicycles lanes. The 43 students of Landscape Department in Kyungpook National University were selected for the research. The major research findings are as follows; 1. Satisfaction degree of 16 variables are assessed in terms of semantic differential scale. The assess group is generally satisfied with variables concerning bicycle lane environment such as $\ulcorner$inclination of the lane (5.2)$\lrcorner$and $\ulcorner$road pavement conditions (5.1)$\lrcorner$. But the group expresses rather low satisfaction degree on the variables related lanes' surrounding landscape such as $\ulcorner$visual variety (3.9)$\lrcorner$, spacious resting place (3.7)$\lrcorner$ and $\ulcorner$variety of facilities (3.1)$\lrcorner$. 2. The level of satisfaction degree regarding 16 variables and 10 photos shows that the male gives relatively higher satisfaction degree than the female group. But there is no statistical significance between the group regarding satisfaction degree of each variable and photo except 4 variables and 2 photos. 3. The assess group gives the highest satisfaction degree on the$\ulcorner$no. 10 slide (6.5)$\lrcorner$ and the lowest on the $\ulcorner$no. 7 slide (2.7)$\lrcorner$. The two photo shows variables of more than 4 points difference of satisfaction degree, such as $\ulcorner$good looking planting threes (4.8)$\lrcorner$, $\ulcorner$enough shadows (4.8)$\lrcorner$ and $\ulcorner$comfortable atmosphere(4.1)$\lrcorner$. 4. $\ulcorner$Aesthetic and amenity factor$\lrcorner$, $\ulcorner$use condition factors$\lrcorner$, $\ulcorner$ike lane environment factors$\lrcorner$, and $\ulcorner$inclination and open view factors$\lrcorner$are the main four factors influencing landscape satisfaction of bicycle lane. Regression model using factor scores for landscape satisfaction degree of bike lane is S(Satisfaction degree)=4.526+1.099(aesthetic and amenity factor)+0.720(use condition factors)+0.486(bike lane environment factors)+0.048(inclination and open view factors($R^2$=0.811).

• International Journal of Highway Engineering
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• v.14 no.4
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• pp.149-162
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• 2012

PURPOSES : The causes of traffic accidents can be classified into the factors of highway users, vehicles, and driving environments. Traffic accidents result from the deficiency in single or combination of these three factors. The objective of this study is to define the "potentially hazardous sections of highway" in terms of traffic safety considering these three factors. METHODS : The test drivers performed repeated driving on these highway sections. The drivers and passengers recorded the sections on which the driving was uncomfortable, and the speeds on the sections excluding the uncomfortable sections were used for the development of the model. RESULTS : The model is composed of three sub-models for each of the horizontal curve, tangent, and the section where the curve starts/ends. The safe driving behavior coefficients by the horizontal curvature were derived by comparing the maximum operating speeds at which the vehicle may slide or deviate and the speeds at which the drivers feel comfort. The safety speeds on tangent were derived by the length of tangent section considering the driver's desired speeds under the traffic condition on which the drivers hardly influenced by the other vehicles. For the sections where the curve starts/ends, the driving behaviors were classified by the distances between the curves, and the safe acceleration/deceleration speeds were derived on which the drivers enter/exit the curve sections safely. CONCLUSIONS : Safety speed could then be regarded that the model suggested in this study may be useful to define the potentially hazardous highway section and contribute the improvement of highway safety.

• International Journal of Highway Engineering
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• v.18 no.6
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• pp.41-50
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• 2016

OBJECTIVES : In this study, microstructural components of crumb rubber modified asphalt (CRMA) binder were investigated using environmental scanning electron microscope (ESEM). To clearly understand the elemental composition of the CRMA binder, energy dispersive X-ray spectroscopy (EDX) was employed on the ESEM samples. METHODS : CRMA binders were produced using open blade mixers at $177^{\circ}C$ for 30 min. The binders were artificially aged through a series of accelerated aging processes. Sample preparation was done by making a mold shape on the glass slide. Thereafter, the morphology of the CRMA binder was observed using the ESEM coupled with the EDX. RESULTS : The images captured from the ESEM indicate that the unaged CRMA binder appears to have a single-phase continuous nonuniform structure after the addition of crumb rubber particles, whereas the artificially aged CRMA binder was observed to have two different phases. ESEM coupled with EDX shows detailed internal structure of the modified binders compared to other technologies (i.e., optical microscopy, atomic force microscopy, and conventional scanning electron microscope). CONCLUSIONS : The captured images resemble the internal structures such as the viscous properties of the unaged CRMA binder and the interaction between the rubber particles and the base binder at aged condition. ESEM is a powerful instrument and with the introduction of EDX, it provided more details of the network microstructure of the asphalt binder. ESEM coupled with EDX is recommended for use in future investigation of microstructure of asphalt binders.

• The Journal of Engineering Geology
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• v.22 no.1
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• pp.59-65
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• 2012

The purpose of this study is to analyze the direction of slope sliding that occurred at the highland ${\bigcirc}{\bigcirc}$ district in the Samcheok coalfield, using geological and structural detail surveys. The study area is dominated by the Paleozoic Pyong-an Group, and sliding is concentrated in zones of alternating sandstone and shale beds in the Geumcheon and Jangsung Formations. Discontinuities in the area have a strike of NE-SW and dip at 30~$80^{\circ}$ to the NW and 40~$80^{\circ}$ to the SE. However, some have strikes of NW-SE. In slide area group 1 (P1 to P4), en echelon tension gashes were caused by shearing. The surface in the areas of group 2 (P5 to P7) and group 3 (P8 and P9) is marked by step-type tension cracks that formed due to extension. This phenomenon caused anticlockwise rotation of the sliding slope. Otherwise, the cutting of the road side through the eastern slope of the mountain contributed to surface sliding due to geographical equilibrium loss.