• Title/Summary/Keyword: 한국 지형학회

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A Selection of the Refuge Area in the West Sea for the National Fishery Supervision Vessel according to the Trajectories of the Extratropical Cyclone in Winter Season (겨울철 온대저기압의 이동경로에 따른 국가어업지도선의 서해 피항지 선정)

  • Chong, Ki-Chol;Seol, Dong-Il
    • Journal of Navigation and Port Research
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    • v.31 no.6
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    • pp.555-562
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    • 2007
  • The environs of Korea in winter season are influenced by the distribution of atmospheric pressure, namely, the typical east-low and west-high pattern that is formed from both the Siberian continental high pressure and the Aleutian oceanic low pressure. In this reason, the violent West or North-West monsoon, the billows with the strong wind, and the tremendous heavy snowfall are encountered very frequently in the West Sea. In this study, the trajectories of the extratropical cyclone are analysed to choose the safe refuge areas of National Fishery Supervision Vessel using the surface analysis weather chart for 11 years from 1994 to 2004. The safe refuge areas according to the trajectories of the extratropical cyclone in the West Sea are decided using data that contain the topographical properties of island, the depth of water, the state of low quality, the influence of tidal current, and the distribution of fishing-net.

A Study on the Development of Educational Modules for Aids to Navigation Using the Aid to Navigation Simulator (항로표지 시뮬레이션 시스템을 활용한 항로표지 교육모듈 개발에 관한 연구)

  • Jeong, Woo-Lee;Jo, Gi-Jong;Moon, Serng-Bae
    • Journal of Navigation and Port Research
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    • v.43 no.6
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    • pp.361-368
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    • 2019
  • Aid to Navigation (AtoN) is the artificial facilities to facilitate the ship's safe navigation using light, shape, color, sound, and radio waves. IALA has developed and operated the educational course for expert groups for the design, deployment, and management of AtoN. Also, maritime educational institutes have operated various educational courses for safe navigation through the ship's operation and ECDIS curriculum for seafarers. However, education using the AtoN Simulator System is needed to prevent marine accidents caused by misunderstanding of the AtoN according to various topographical, environmental, and maritime traffic environments. In this study, the existing ship handling simulator and AtoN simulator were applied to develop educational modules for accurate understanding and application of AtoN in various environments, enhancing the quality of education from the existing theoretical point of view and improving practical use to maximize educational efforts.

Improvement of Learner's learning Style Diagnosis System using Visualization Method (시각화 방법을 이용한 학습자의 학습 성향 진단 시스템의 개선)

  • Yoon, Tae-Bok;Choi, Mi-Ae;Lee, Jee-Hyong;Kim, Yong-Se
    • Journal of KIISE:Computing Practices and Letters
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    • v.15 no.3
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    • pp.226-230
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    • 2009
  • Intelligent Tutoring System (ITS) is a procedure of analyzing collected data for teaming, making a strategy and performing adequate service for learners. To perform suitable service for learners, modeling is the first step to collect data from the process of their learning. The model, however, cannot be authentic if collected data can contain learners' inconsistent behaviors or unpredictable learning inclination. This study focused on how to sort normal and abnormal data by analyzing collected data from learners through visualization. A model has been set up to assort unusual data from collected learner's data by using DOLLS-HI which makes possible to diagnose learner's learning propensity based on housing interior learning contents in the experiment. The created model has been confirmed its improved reliability comparing to previous one.

Performance of a Hellow Fiber Membrane Diffuser for the Biological Removal of Gaseous BTX (Diffuer 형태의 중공사막 생물반응기를 이용한 기체상 BTX 제거)

  • Son, Young-Gyu;Khim, Jee-Hyeong;Song, Ji-Hyeon
    • Journal of Soil and Groundwater Environment
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    • v.11 no.4
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    • pp.25-32
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    • 2006
  • In this study, a novel bioreactor system using a diffuser type hollow fiber membranes (hollow fiber membrane diffuser, HFMD) was applied to investigate the feasibility and biodegradation capacity for the treatment of a gaseous mixture consisting of benzene, toluene and p-xylene(BTX). First, A mixed culture pre-acclimated to toluene effectively biodegraded the BTX mixture at an overall removal efficiency of approximately 70% for a 20-day operational period. It was found that the biodegradation of toluene was slightly inhibited because of the presence of benzene and p-xylene. Second, the elimination capacity (EC) of total BTX increased up to 360 $g/m^3/hr$, which was substantially higher than maximum ECs for BTEX reported in the biofiltration literature. Consequently, the hollow fiber membrane diffuser was considered as an alternative method over other conventional VOC-treating technologies such as biofilters.

Pythium spp. Isolated from Turfgrasses at Golf Courses in Korea (우리나라 골프장 잔디에서 분리한 Pythium spp.)

  • Kim, Jin-Won;Park, Eun-Woo
    • The Korean Journal of Mycology
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    • v.25 no.4 s.83
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    • pp.276-290
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    • 1997
  • Eleven species of Pythium were identified from 125 isolates collected from leaf blight lesions on creeping bentgrass (Agrostis palustris Huds.), Kentucky bluegrass (Poa pratensis L.), and zoysiagrasses (Zoysia japonica Steud., and Z. matrella (L.) Merr.) at 35 golf courses in Korea in $1990{\sim}1996$. The identified species included P. aphanidermatum, P. arrhenomanes, P. catenulatum, P. graminicola, P. myriotylum, P. oligandrum, P. periplocum, P. rostratum, P. torulosum, P. ultimum var. ultimum, and P. vanterpoolii. Mycological characteristics of sporangia, oogonia, antheridia, and oospores observed on the sucrose-asparagine bentgrass leaf culture medium were described for each species. Of the species, P. arrhenomanes, P. catenulatum, P. gmminicola, P. oligandrum, P. periplocum, P. rostratum, P. torulosum and P. vanterpoolii were reported for the first time in Korea. P. myriotylum, P. rostratum, P. torulosum and P. vanterpoolii showed characteristic colony patterns on the potato-carrot agar medium, which can be used as criteria for species identification of Pythium.

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Comparing the Inflow Rate of Sewage Treatment Plants Invested by the Public Funds or Public-Private Partnership (PPP) Projects (재정사업과 민간투자사업의 하수처리장 하수유입률 특성분석)

  • Lee, Wonseok;Cho, Eunju;Son, Younggyu;Khim, Jeehyeong
    • Journal of Korean Society on Water Environment
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    • v.25 no.5
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    • pp.778-784
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    • 2009
  • The purpose of this study is to figure out the differences of the inflow rates of Sewage Treatment Plants (STP), invested by public fund or public-private partnership (PPP). This paper finds that the average ratio of sewage inflow according to facility capacities (medium and small scale STP) was either nearly below 30% or above 100% in the first year. As the size of STP increased, there was decrease in the accuracy of demand assumption. This was because the operation time when the ratio of sewage inflow was uniform was different according to the size of STP, whereby the time was short when the STP were small. The design average ratio of sewage inflow was 10% larger than the real average ratio; this was considered overdesigned. In the case of a plant built by the PPP scheme, the average ratio of inflow of the STP before an abolition of MRG was larger than after the abolition of MRG. This may be explained by moral hazard from too much reliance on MRG. After the abolition of MRG, the demand risk of PPP was shifted from a PPP project to a conventional project.

Assessment of Ecological Grade Based on Polychaete Fauna in the Western and Southern Coast of Korea (우리나라 서·남해안에서 출현하는 다모류를 통한 해역의 생태등급 산정)

  • Paik, Sang-Gyu;Park, Heung-Sik;Yun, Sung Gyu;Je, Jong-Geel
    • Journal of Wetlands Research
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    • v.7 no.2
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    • pp.89-104
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    • 2005
  • This study examined ecological grade of tidal flats at 59 sites along the west and east coast of Korea from January 1998 to December 2002. Assessment of ecological grade based on 7 headings includes biological and human geographical factors, such as species diversity and richness, utility value of species, possibility of damage and reservation conditions of coastline. Total of 181 species with 37 families of 14 orders were listed in this study. The highest scores (ecological grade I) showed at these five sites, Hagampo in Chungnam, Ui-do and Geomun-do in Jeonnam, Bijin-do and Maemul-do in Gyungnam. Half of thestudy sites belong to ecological grade II and 19 sites showed ecological grade III. Singyeong in Gyeonggi, Janghang in Chungnam, Gyehwado and Gomso in Jeonbuk, Dadepo in Busan were assessed as ecological grade IV. Grade V (the worst) was not found in this study.

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Analysis of Inundation Causes in Urban Area based on Application of Prevention Performance Objectives (도시유역에서의 방재성능목표 적용과 침수원인 분석)

  • kim, Jong-Sub
    • Journal of Wetlands Research
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    • v.18 no.1
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    • pp.16-23
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    • 2016
  • The purpose of this study is to analyze quantitatively the inundation causes by applying the prevention of performance objectives using the urban storm water runoff model XP-SWMM. The model was built by using DTM and storm sewer-network with the storm sewer and geo-data of the study area as input-data to assess the current performance of prevention. An analysis of the causes of the inundation by the frequency and the rainfall-duration. As a result, lack of pipe capacity due to flooding, as well as inundation heavier that the backwater rainfall occurs due to the rise of water level of outside. For solve the inundation damage, It is necessary to improvement pipe of capacity lack and installation of a flood control channel.

Tight Path Following PID Controller for a Vehicle with Time Delay (비행체 시간지연을 고려한 정밀경로추종 PID 제어기법)

  • Rhee, Ihn-Seok;Park, Sang-Hyuk;Lee, Kyoung-Ho
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.39 no.7
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    • pp.618-626
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    • 2011
  • In order to complete missions in a complicated terrain or highly dangerous area, an unmanned aerial vehicle(UAV) needs a fine controller to precisely follow the desired path. A PID controller used for the path following feeds forward path curvature information to the control input to improve the path following performance. High gain for PID controller is necessary to follow path tightly. However the high gain could cause instability or performance degradation when the vehicle has slow dynamics. We present PID controller design method which considers response delay of vehicle as well as path curvature. In order to obtain path curvature the desired path is described as a 3rd order polynomial by applying cubic spline interpolation. We apply the proposed controller to the path following of a UAV which is operated in high altitude and has very slow lateral dynamics. The lateral dynamics are modelled as a first order delayed system in the controller design. Nonlinear simulation shows the UAV with proposed controller follows an arbitrary path very tightly.

Distributed Task Assignment Algorithm for SEAD Mission of Heterogeneous UAVs Based on CBBA Algorithm (CBBA 기반 SEAD 임무를 위한 이종무인기의 분산형 임무할당 알고리듬 연구)

  • Lee, Chang-Hun;Moon, Gun-Hee;Yoo, Dong-Wan;Tahk, Min-Jea;Lee, In-Seok
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.40 no.11
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    • pp.988-996
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    • 2012
  • This paper presents a distributed task assignment algorithm for the suppression of enemy air defense (SEAD) mission of heterogeneous UAVs, based on the consensus-based bundle algorithm (CBBA). SEAD mission can be modeled as a task assignment problem of multiple UAVs performing multiple air defense targets, and UAVs performing SEAD mission consist of the weasel for destruction of enemy's air defense system and the striker for the battle damage assessment (BDA) or other tasks. In this paper, a distributed task assignment algorithm considering path-planning in presence of terrain obstacle is developed for heterogeneous UAVs, and then it is applied to SEAD mission. Through numerical simulations the performance and the applicability of the proposed method are tested.