• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.21 no.2
• /
• pp.181-189
• /
• 2003

A virtual flood scenario has been constructed to investigate the overflowing process in the flooding area. The topography is constructed using the airborne LIDAR data. In addition, the frequency and scale of the flooding and the destruction condition of the flooding defensive structure are used as input to the scenarios. Through the scenario, the inundation depth with respect to time and maximum depth has been analyzed. This analysis shows the water level variation with time which show the flooding process. Moreover, a flooding map is drawn using the results from the scenario, distribution of the defensive structure, vulnerable area, and expected destruction points in the study area. It is expected that this study can be effectively used to examine the flooding process and flood disaster management. Furthermore, it could provide important basic information for the land development and the city planning of a possible flooding area.

• Journal of Life Science
• /
• v.14 no.2
• /
• pp.229-234
• /
• 2004

Feathers, which are almost pure keratin protein, are produced in large amounts as a waste by-product at poultry-processing plants. Keratinolytic enzymes may have important uses in biotechnological processes involving keratin-containing wastes from poultry and leather processes. In this study, screening and identification of keratin-degrading bacteria were investigated. Five keratin-degrading bacterial strains (F3-1, F3-4, F7-1, C1-1, C1-2) were isolated from compost and decayed chicken feather. On the basis of morphological, physiological studies, and Biolog system, all isolates were identified as the genus Bacillus. Among them, the strain F7-1 had the highest feather-degrading activity and was selected for further taxonomical study. Phylogenetic analysis of strain F7-1 based on comparison of 165 rDNA sequences revealed that this strain is closely related to Bacillus megaterium.

• Applied Microscopy
• /
• v.2 no.1
• /
• pp.17-31
• /
• 1972

Light and electron microscopic studies were made to investigate the morphological changes in growing galls on the leaf of Lycium chinense MILL caused by Eriophyes kuko Kishda. The results are summarized as follows: 1. Light microscopy At the early stage of the invasion of E. kuko on the back side of the young leaf of L. chinense, the.epidermal cells become hypertrophic and develope a gall. As the gall grows, the cells of both palisade and spongy-layers become hypertrophic and these tissues are hard to be distinguished because of their irregular outgrowth. As the gall grows, the nuclei of the gall also become hypertrophic and larger than these of normal cells. 2. Electron microscopy Under electron microscopy the mitochondria, the golgi apparatus and the plastids of the advanced galls are degenerated and disintergrated and the cell walls become thicker than normal ones. The characteristic star bodies and the ring-form structures are found in the mature gall cells.

• Journal of Korean Society of Forest Science
• /
• v.35 no.1
• /
• pp.47-55
• /
• 1977

As the development of national lands increase, the necessity to develop less favorable terrain also increases. It also becomes more difficult and complicated to provide access that is both economical and safe from contributing to soil erosion on roadsides and to londscape damages. Because of the increased and justified emphasis upon environmental degradation, proper stabilization of the cut-and bank slopes of roadsides, plant sites and building sites in Korea requires careful planning as well as execution of the constructions. All fill slopes should be compacted to a degree consistent with design standards and material properties. Drainage facilities should be provided to prevent damaging concentrations of surface runoff and to avoid high pore pressures in cuts and fills. All surfaces of cut-fill slopes should be revegetated with suitable species as soon as possible after construction. To stabilize the cut-fill slopes of highway roadsides should be considerded the factor of stabilization as well as landscape conservation especially. Such basic influences as the effects of vegetations on water balance of rain fall, on the control of surface erosion and on the surface slope failures are briefly discussed in the report.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.34 no.2
• /
• pp.155-162
• /
• 1989

This experiment was conducted to investigate the endosperm characteristics of an opaque rice which was derived from an Indica cultivar Pokhareli Mashino. Grain apperance of opaque rice looked similar to the waxy grain, while the blue-color response to the iodine solution was similar to non-waxy endosperm. The shape of starch granules was alike each other, but their size were different each other with the smallest of the opaque rice. Their cristaline structure of starch granules were A type. The content of total protein and most of the amino-acids of opaque rice was about 1.5 times of other varieties. Alkali digestibility of the opaque rice was very low. Total water uptake and hydration rate of opaque rice was similar to non-waxy variety Tongil. Amylogram characteristics such as viscosity, setback and consistency of opaque rice revealed medium value between. waxy and non-waxy rice.

• Journal of the Society of Disaster Information
• /
• v.15 no.4
• /
• pp.493-501
• /
• 2019

Purpose: The purpose of this study is to prevent construction safety accidents, and the design safety systems were reviewed. This paper aims to establish as an effective system by looking at the implementation procedures and contents of the design safety review system. Method: We reviewed the purpose and content of the law, accident statistics, etc. for the study. In addition, we looked at the implementation plans for actual construction sites using the 'design safety' assessment process as defined by the Act. Results: We divided it into the data review phase, the risk factor elicitation and alternative setup phase, and the design safety assessment report preparation stage. Conclusion: it is necessary to derive risk factors that take into account the diversity of construction sites. However, the effectiveness of other reports is questioned as they are often copied and written. Therefore, it is necessary to strengthen external verification procedures attended by construction safety experts.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2012.05a
• /
• pp.414-414
• /
• 2012

하천에 산사태, 하천 주변 개발, 제방 및 댐 붕괴 등으로 인하여 다량의 토사가 돌발적으로 유입될 경우 유입된 토사가 하천의 거동에 미치는 영향은 막대하다. 또한 하도 내에 설치되어 있는 교량, 보와 같은 수공 구조물로 인하여 단면형태가 갑작스럽게 변화하는 경우나, 구조물로 인하여 토사가 퇴적되는 경우 하천의 수위 변화를 크게 유발하여 하천 범람과 제방 침식 등을 발생시키며 하천의 안전에 큰 위험 요인으로 작용하게 된다. 현재 다량의 토사가 하천에 돌발적으로 유입되는 위험으로부터 안전하게 보호하기 위해서 토사 유입 방지 대책에 대하여 많은 연구와 사업이 실시되고 있지만 이러한 치수대책이 완전하다고 하기에는 다소 어려운 상황이다. 따라서 홍수 조절 및 방재를 위한 수방대책 수립 및 수자원의 집중적인 관리가 무엇보다 절실히 요구되며, 이와 같은 토사에 의한 방재대책 수립을 위해서 수리학적 특성을 정확히 파악할 필요가 있다. 본 연구에서는 2011년 7월에 발생한 강우에 의하여 침수피해가 발생된 경기도 이천의 오천천을 대상으로 수치해석을 통한 침수 범람 원인을 분석하였으며, 하류부에 위치하고 있는 공장의 경우 내부가 1m이상 침수됨에 따라 흔적수위 및 현장 상황을 조사하였고, 당일 강우를 통한 홍수위를 산정하여 여러 가지 원인별 홍수 원인을 분석하였다. 2011년 7월에 발생된 강우는 복하천 하천정비기본계획에 제시되어 있는 설계빈도로 30년 빈도에 못 미치는 것으로 나타나 강우에 의한 영향보다는 외부 영향으로 판단되며, 상류로부터 순간적으로 유입된 토사의 과다 퇴적에 의한 수위 상승에 의하여 교량 및 보 등의 수공구조물과 연계된 통수 단면적의 부족 등의 영향으로 홍수 범람이 발생된 것으로 분석되었다. 홍수 범람에 의한 영향을 분석하기 위하여는 단순히 강우에 대한 영향을 고려하는 것 보다 하천의 전반적인 특성을 고려하여 정확한 원인 규명을 통한 대처방안이 수립되어야 하며, 지속적인 모니터링을 통하여 하천에 의한 피해를 최소화 할 필요가 있다.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2018.05a
• /
• pp.278-278
• /
• 2018

현재 우리나라에서는 행정안전부의 풍수해저감종합계획, 사전재해영향성검토협의, 재해위험지구개선사업 등에 해외에서 개발된 상용프로그램이 사용돼 접근성 저하로 인해 지자체 방재담당자의 실무나 대학에서 연구용으로 다루기에는 한계가 있다. 이에 본 연구에서는 내수침수, 외수침수, 2차원 침수해석으로 구성하여 GUI 기능을 강화한 통합침수재해지도 작성시스템(i-FIM, Integrated Flood Inundation Modeling system)을 개발하여 입력자료의 구성 및 매개변수의 수정이 용이하게 함으로써 하수관망 등에 부분적인 설계 변경이 있는 경우 지자체 방재담당자가 간단한 작업을 통해 침수영향 변화를 쉽게 파악할 수 있도록 하였다. 또한, 상세한 지형의 반영이 필요한 도시지역의 2차원 침수해석의 경우 계산격자 망의 크기가 작아질수록 소요되는 계산시간이 기하급수적으로 증가하는 한계가 있어 i-FIM에서는 계산격자를 $2{\times}2$, $3{\times}3$, $5{\times}5$ Subgrid 형태의 격자를 적용하고, 병렬프로그래밍과 계산시간조정 기능을 추가하여 2차원 침수해석 모형의 계산 속도를 향상시켰다. 이를 실무에 적용하기 앞서 2006년 집중호우로 인해 안성시에서 발생한 제방 붕괴사상, 2016년 태풍 차바로 인해 울산시에서 발생한 제방 월류 사상을 통해 침수흔적도와 비교하여 검증을 실시하였다. i-FIM에서 최종적인 2차원 침수해석 결과는 2017년에 개정된 '재해지도 작성 기준 등에 관한 지침'의 침수심 등급 구분의 색채 설정에 따라 각 격자별 침수심을 표출함으로써 표준화된 재해지도 작성이 가능하도록 하였다. 또한, 포털사이트의 지도 및 위성지도에 표출함으로써 침수 위험이 발생할 수 있는 지역의 현재 이용 용도를 파악하여 침수재해에 대한 상세한 대책을 마련할 수 있을 것으로 판단된다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2012.05a
• /
• pp.331-341
• /
• 2012

A modified Ignition and Growth(I&G) model which is necessary to simulate the combustion phenomena of energetic materials and an analytical model determining the unknown parameters of the reaction rate equation are proposed. The modified I&G model sustains important physical implications with overcoming some problems of previous rate equations. This rate model consist of Ignition term which represent the formation of the hotspot due to void collapse and Growth term which means the shock to detonation transition phenomena. Also, the theoretical model is used to investigate the combustion characteristics of certain energetic materials before running Hydrocode by pre-determination of unknown parameter, b, G, x, I. The analytical model provides efficient and highly accurate results rather than previous method which simulated the unconfined-rate-stick via the numerical means.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.26 no.5
• /
• pp.161-170
• /
• 2022

The maintenance of bridges installed in rivers is carried out through facility safety inspection and repair & reinforcement procedures according to the results. Many studies have been so far conducted on the safety check of the bridge upperstructure because of the ease of access. However as it is impossible to directly investigate whether the pier foundation installed in the river has been scoured. Management of underwater foundations has remained based on theory. In this study, the scour of the bridge foundation installed in such a river was realized in 3D form by using an echo sounder and VRS. This made it possible to predict the scour pattern through comparison and analysis with the ground height of the riverbed at the time of the bridge installation. Based on these results, if the pier foundation is used as an initial data to determine whether or not local scour is present and to predict long-term scouring, bridge collapse due to foundation scour can be prevented.