• Journal of Korean Society of Forest Science
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• v.102 no.2
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• pp.176-181
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• 2013

The impacts of habitats changes of benthic macroinvertebrae species and individuals of the torrents due to construction of torrent structures can be summarized as follows. Approximately 16 to 40 species and 352 to 4,333.3 individuals of benthic macroinvertebrae were found around the local position of the torrent structures. Construction of torrential structures can increases the stability in the riverbed by preventing vertical corrosion and reducing the flow rate. However, if pond is created due to increase flow rate of rainfall, the temporal confusion of micro-habitats may lead to decrease in the number of species and induce reduced number of diversity as well as cause simplification in the community structure. Therefore, erosion control structures in torrent cause influence on the habitual ecosystem, though there are differences in the degree per distance depending on the types and heights of the structure. Before establishing torrent erosion control structure in mountainous torrent area, ecosystem status should be studied carefully from the planning stage and torrent habitats should be protected by deciding type, height and scale of structure, to minimize the influence on local habitants.

• Journal of Korean Society of Forest Science
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• v.101 no.1
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• pp.130-137
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• 2012

This study has conducted to develop new gabion wall systems with vegetation base materials for stream bank stability and rapid rehabilitation. Vegetation base materials are primarily compounded with fine soil, organic composts and peat moss as plant fibers, a water retainer and a soil improver. Normally gabion wall systems resist the lateral earth pressures or stream power by their own weight. Therefore, fill material must have suitable weight, compressive strength and durability to resist the loading, as well as the effects of water and weathering. In this project, 100 to 200-mm clean, hard stones are basically specified, and about 50-mm rubbles are also used. Test application of new gabion wall system carried out in the stream bank of a small stream in the Gwangreung experimental forest, belonging to Korea Forest Research Institute (KFRI) in December 16th, 2006. As a result of the analysis of hydraulic stability of new gabion wall system, gabion wall system has highest threshold shear stress when the gabion wall covered by vegetation. New gabion wall system is highly resistant to sliding and overturning because safety coefficients exceed 1.5. As a result of term of slope stability analysis of new gabion wall system by Bishop and Fellenius methods, stability of stream bank was highly increased after the construction of gabion wall. Therefore, new gabion wall system is effective to stabilize unstable stream bank.

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.4
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• pp.438-444
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• 2018

Korea has recently selected twenty-two ports for reinforcement breakwater installation of protection facilities, due to rise sea level caused by global warming and increase in the number of typhoon and tsunami. In addition, due to consistent enlargement of ship size, dredging for depth of water for large vessel's berthing and enlargement of berth is under construction. However, no definite construction plan for the reinforcement and lengthening of crown height, which has close relationship with the safe mooring of ships. In this study, domestic and foreign design criteria of crown height were analyzed, and the crown height evaluation index and evaluation method were developed by dividing it into environment and ship elements. In particular, in the case of ship evaluation index, each step was set up in 4 steps according to domestic and foreign regulations, weighted by each step, and the safety level of crown height was evaluated. As a result of the mooring safety simulation of the 100,000 ton cruise ship, the appropriate minimum crown height standard was derived to be 3 m above A.H.H.W. The results of this study are expected to be used as basic data to propose the crown height standard reflecting ship characteristics.

• Journal of Korean Society of Forest Science
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• v.108 no.2
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• pp.241-258
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• 2019

The aim of this study was to analyze the factors that affect the habitat of fishes and amphibians in a mountain stream that is part of an experimental forest at Kongju National University, Gongju, Chungcheongnam, Korea, and examine the differences in the presence of fishes and amphibians in the stream before and after construction of an erosion control dam. The results showed that the factors that affect the presence of fishes are pH, electrical conductivity (EC), dissolved oxygen (DO), flow velocity, and step-pool number, and that the factors that affect the presence of amphibians are monthly rainfall, pH, EC, DO, and crown density. Of these factors, pH, EC, flow velocity, and monthly rainfall were significantly different before and after dam construction; however, the differences among the other three factors from dam construction, except EC, might not have been enough to affect the presence of fishes and amphibians. Our results suggest that the difference in the frequency of fishes and amphibians surveyed before and after dam construction in the upper and lower stream sections were not statistically significant. One exception to this was the presence of amphibians in the lower stream section during and after dam construction, which could have been the result of a large amount of sediment produced by excavation that led to high EC.

• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.6
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• pp.1036-1043
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• 2022

This paper discusses about the development of a visual sensor that can be installed in an automatic mooring device to detect the berthing condition of a vessel. Despite controlling the ship's speed and confirming its location to prevent accidents while berthing a vessel, ship collision occurs at the pier every year, causing great economic and environmental damage. Therefore, it is important to develop a visual system that can quickly obtain the information on the speed and location of the vessel to ensure safety of the berthing vessel. In this study, a visual sensor was developed to observe a ship through an image while berthing, and to properly check the ship's status according to the surrounding environment. To obtain the adequacy of the visual sensor to be developed, the sensor characteristics were analyzed in terms of information provided from the existing sensors, that is, detection range, real-timeness, accuracy, and precision. Based on these analysis data, we developed a 3D visual module that can acquire information on objects in real time by conducting conceptual designs of LiDAR (Light Detection And Ranging) type 3D visual system, driving mechanism, and position and force controller for motion tilting system. Finally, performance evaluation of the control system and scan speed test were executed, and the effectiveness of the developed system was confirmed through experiments.

• 월간 한농연
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• s.62
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• pp.16-19
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• 2007

8월 14일, 조선일보는 중국산 식재료를 쓰는 국내 음식업계의 실태에 대한 특집기사를 게재하였다. 더욱이 '갈비탕 통조림 파동', 미국산 광우병 쇠고기 검역 재개 방침이 발표된 직후, 350만 농민과 소비자들을 다시 한 번 충격에 빠졌다. '월간 한농연'은 최근 언론에 보도된 관련 보도물의 내용을 요약.정리하고, 국회에 계류중인 음식점 식육원산지표시제 확대를 골자로 한 '식품위생법' 개정을 앞당기고자 특집 기사를 싣는다.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2004.05a
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• pp.151-156
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• 2004

최근 국내외에서 국제무역 물량의 증대에 따라 대규모 항만 건설 공사가 진행되고 있으며, 이에 경제성, 시공성이 뛰어난 Caisson 형식의 구조물이 많이 사용되어지고 있다. 특히 항만 및 어항의 외곽시설인 방파제는 계류선박의 안전과 하역 및 적화를 용이하게 하는 중요한 구조물이다. 따라서, 본 연구에서는 Caisson식 방파제에 태풍, 충격력과 같은 몇 가지 외력 조건에 대하여 구조 해석을 실시하여 손상메커니즘을 분석하였다 이러한 손상 메커니즘에 따라 손상을 인위적으로 발생시켜 손상 위치 탐색을 수행하였다.

• 농업기술회보
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• v.49 no.4
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• pp.15-16
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• 2012

고추냉이는 식욕증진, 항산화 기능성, 항곰팡이성 등 건강을 위한 기능성 성분을 함유하고 있어 식용 또는 가공을 통한 활용 가능성이 무한한 작물이다. 그러나 재배적지가 제한적이며 재배기술 또한 계류식 물재배 및 밭 재배 방식에 국한되어 있다. 또한 자연환경에 민감한 고추냉이는 국내 생산량이 미흡하고 잎, 줄기 등과 같은 부산물의 이용은 극히 제한적이다. 따라서 '고추냉이 추출물의 농업적 이용 및 수경 재배 기술' 개발과제를 통하여 고추냉이 부산물의 활용 방법을 높이고 재배방식의 한계점 극복을 통한 재배면적 확장 기술을 개발하고자 하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.317-319
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• 2012

제주 애월항내에 LNG 공급에 필요한 인수기지 건설 및 연안화물 수송을 위한 항만시설 건설 계획에 따라, 3천DWT급 LNG 운반선 및 모래운반선, 시멘트 운반선 부두가 신설될 예정이다. 안전하고 효율적인 부두 건설을 위해 국토해양부 해상교통안전진단 시행지침에 의거 안전진단을 수행하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.06a
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• pp.326-328
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• 2012

충남 당진군 동부그린발전소를 건설하려는 계획에 따라, 15만 DWT급 석탄운반선 부두 및 3천 DWT급 석회석운반선 부두가 각각 1선석씩 건설될 예정이다. 안전하고 효율적인 부두 건설을 위해 국토해양부 해상교통안전진단 시행지침에 의거 안전진단을 수행하였다.