• 대한토목학회논문집
• /
• 제3권1호
• /
• pp.13-24
• /
• 1983

장주기파(長週期波)에 의한 항내(港內)의 반응(反應)을 예측(豫測)하기 위하여 비선형(非線型) 편미분방정식(偏微分方程式)으로 표현(表現)되는 2차원(二次元) 부정류(不定流)의 운동방정식(運動方程式)과 연속방정식(連續方程式)을 확정(確定)하고, 이 식(式)들에 Abbott의 Implicit 형(型) 차분형(差分型)을 적용(適用)하여 유한(有限) 차분방정식(差分方程式)의 형태(形態)로 유도(誘導)한 후(後), double sweep 알고리즘에 의하여 해석(解析)하는 수학적(數學的) 모형(模型)을 개발(開發)하였다. 본(本) 모형(模型)은 임의(任意)의 파형(波形), 풍속(風速)과 수심(水深), 위도(緯度) 등(等)을 입력자료(入力資料)로 하여 임의(任意)의 지형(地形)을 가진 항내(港內)에서의 반응(反應)을 해석(解析)할 수 있도록 설계(設計)되었다. 특(特)히 파향(波向), 이송항(移送項), 항입구(港入口)로 되돌아 나오는 에너지의 방사현상(放射現象) 등(等)을 수치해석적(數値解析的)으로 처리(處理)하는 수법(手法)의 개발(開發)에 관(關)하여 연구(硏究)하였다. 본(本) 모형(模型)에 의한 해석결과치(解析結果値)는 1차원(次元) 및 2 차원(次元) 정진동(靜振動)(seiche) 수치실험(數値實驗)을 통(通)하여 검정(檢定)하였으며, Ippen과 Goda의 이론해석치(理論解析値) 및 실험결과치(實驗結果値)와 비교(比較)하였다.

• The Plant Pathology Journal
• /
• 제23권4호
• /
• pp.308-313
• /
• 2007

A survey of the occurrence of abiotic diseases on kiwifruit (Actinidia deliciosa) trees was conducted at sixty-two kiwifruit orchards in twenty-one locations of Jeonnam and Jeju Provinces in Korea during the 2007 growing season. Various kinds of abiotic diseases were detected on the kiwifruit trees. Malformed fruits caused by incomplete pollination were commonly observed among the normally growing fruits on almost all of the kiwifruit trees examined. Fruits imbued with wire rust, fruits scratched or girdled by the wire and fruits injured by sunscald occurred in all of the examined orchards. Abnormal growth of girdled branches by the fence wire, dead trees killed by excessive soil moisture due to poor draining and leaf chlorosis by nutrient deficiencies were found in some orchards. Leaf spotting by herbicide and leaf scorch or blight by excessively high temperature were observed. Leaf blight on young shoots by late frost and bark split on trunks by freeze occurred in several open-field orchards. Flooding and strong wind damages by attack of typhoon 'Nari' were also found during the survey period. Cup-shaped leaves frequently occurred on young shoots in early spring and the incidence of the syndrome tends to increase annually in recent years, which are not etiologically defined until now.

• 한국농림기상학회지
• /
• 제3권3호
• /
• pp.156-162
• /
• 2001

In order to monitor local climatic information, twelve automated weather stations (AWS) were installed in alpine area by the Alpine Agricultural Experiment Station, Rural Development Administration (RDA), at the field of major crop located in around highland area, and collected data from 1993 to 2000. Hourly measurements of air and soil temperature (underground 10 cm,20 cm), relative humidity, wind speed and direction, precipitation, solar radiation and leaf wetness were automatically performed and the data could be collected through a public phone line. Datalogger was selected as CR10X (Campbell scientific, LTD, USA) out of consideration for sensers' compatibility, economics, endurance and conveniences. All AWS in alpine area were combined for net work and daily climatic data were analyzed in text and graphic file by program (Chumsungdae, LTD) on 1 km $\times$ 1 km grid tell basis. In this analysis system, important multi-functionalities, monitoring and analysis of local climatic information in alpine area was emphasized. The first objective was to obtain the output of a real time data from AWS. Secondly, daily climatic normals for each grid tell were calculated from geo-statistical relationships based on the climatic records of existing weather stations as well as their topographical informations. On 1 km $\times$ 1 km grid cell basis, real time climatic data from the automated weather stations and daily climatic normals were analyzed and graphed. In the future, if several simulation models were developed and connected with this system it would be possible to precisely forecast crop growth and yield or plant disease and pest by using climatic information in alpine area.

• 한국항공우주학회지
• /
• 제40권5호
• /
• pp.413-422
• /
• 2012

덕티드팬을 추진 장치로 사용하는 소형 무인항공기는 도심 및 협소한 공간에서 정찰 및 감시에 사용 가능하며, 프로펠러에 비해 높은 추진 효율과 추력 특성을 나타낸다. 덕티드팬 무인항공기의 운용 거리와 비행 시간을 증가시키기 위해서는 정지 비행 및 전진 비행시의 추력 특성연구가 중요하며 비행 안정성 확보를 위해서는 비정상 3차원 유동 특성 연구가 필수적이다. 본 연구에서는 동익과 정익으로 구성된 덕티드팬의 설계 결과 검증과 안정적인 비행 특성을 확인하기 위해 덕티드팬의 추력 특성과 비정상 3차원 유동장을 계측하였다. 덕티드팬의 정지 및 전진 비행시의 추력 특성은 소형 아음속 풍동의 6분력 밸런스 시스템을 이용하여 측정되었고, 비정상 3차원 유동장은 $45^{\circ}$ 경사열선의 프로브 고정법에 의해 분석되었다. 덕티드팬의 덕트와 정익이 추력특성에 다소 큰 영향을 미치며, 정익에 의해 덕티드팬의 안정적인 비행이 가능함을 확인하였다.

• 한국항공우주학회지
• /
• 제33권9호
• /
• pp.1-8
• /
• 2005

이차원 타원형 날개꼴에서 펄스제트 브로잉에 의한 박리 제어 효과에 대하여 연구하였다. 박리 유동의 능동제어기술 개발을 위하여 압축공기를 사용하는 연속제트/간헐제트 엑츄에이터를 설계제작하여 타원형 날개 풍동 실험 모델에 장착하였다. 아음속 유동에서 날개 주위 유동장의 PIV 측정과 유동의 가시화을 통하여 간헐제트 브로잉의 타원형 날개의 실속제어 효과와 실용성에 대해 실험연구를 수행하였다. PIV 실험 결과 제트 브로잉에 의해 난류 후류 영역과 박리 버블의 크기를 현저하게 감소시킴으로써 박리제어가 가능함을 보였다. 간헐제트는 연속제트보다 박리제어에 보다 효과적이었다. 간헐제트의 주파수를 증가시키면 보다 높은 받음각에 이르기까지 난류 박리 후류를 효과적으로 억제할 수 있었다.

• 한국항해항만학회지
• /
• 제34권2호
• /
• pp.105-110
• /
• 2010

The studies on automatic ship collision avoidance system, which have been carried out in the last 10 years, are facing on new situation due to newly developed high technology such as computer and other information system. It was almost impossible to make it used in real navigation field 3-4 years ago because of the absence of any tool to give other ship's information, however recently developed technology suggests new possibility. This study is carried out to develop the automatic ship collision avoidance support system which considers ship's manoeuvrability into it's collision avoidance algorithm. One of the important part in ship collision avoidance system is collision decision module which can calculate collision risk with other ships and act properly to avoid the situation. Many of previous researches are using present ship's dynamic data such as present speed, position and course to calculate collision risk. However when a ship commences avoidance action, the real situation is quite different with one that has been estimated by the ship's initial data due to the ship's manoeuvring characteristic. Therefore it is better to take into account ship's manoeuvring characteristic from the stage of collision decision in ship collision avoidance system. In this study, these effects are included in the developed system. The proposed system are verified its usefulness in numerical simulation environments.

• 한방안이비인후피부과학회지
• /
• 제16권3호
• /
• pp.1-37
• /
• 2003

The epistaxis is commonplace and temporary disease in the field of ENT. In most cases, it is a slight illness, but sometimes, it leads to death because of copious bleeding. The first treatment of epistaxis is stoping hemorrhage, but the real state of treatment in oriental medical is not thoroughgoing enough. So we referred to oriental medical journals and sundry records about etiology and remedy of epistaxis, we got this results. 1. The etiology of epistaxis was mostly bleeding due to heat in the blood by dysfunction of Jang and Bu Gi, there were affection wind-cold by exopathogen, spleen heat to liver, excessive fire of lung meridian, stagnated fire-heat of upper Cho, excessive drinking, bruise and so on. 2. The treatment was used much to remove heat from the blood and activating blood, in case of getting no better, it's used to enriching the blood or clear Gi. 3. The internal remedy of epistaxis was the most used 20times SeogakJihwangtang(犀角地黃湯) to remove heat from the blood and activating blood, and used Jihwangtang(地黃湯), Samhwangbohyultang(三黃補血湯), Jiyuksan(止육散), hueksinsan(黑神散), etc. The drugstuffs were the most used 51times Radix Rehmanniae Preparata((生地黃) to clear heat and remove heat from the blood, produce the body fluids, yin, and used Radix Paeoniae Alba(芍樂) and Radix Glycyrrhizae(甘草), Radix Angelicae Gignatis(當歸), Radix Scutellariae(黃岑), Rhizoma Coptidis(黃連) and Fructus Gardeniae(梔子), etc. 4. The external medical treatment of epistaxis was the most used 16times spraying the granular medication into the cavity and attaching Allii Bulbus(大蒜) to center of the sole or binding the middle finger, etc.

• 지구물리와물리탐사
• /
• 제20권4호
• /
• pp.199-206
• /
• 2017

해상탐사에서 얻어지는 현장자료는 바람, 파도, 조류, 배경매질의 유속 등 다양한 환경요소에 영향을 받는다. 배경매질의 유속을 제외한 대부분의 환경요소는 자료처리 단계에서 적절한 보정이 이루어지고 있다. 본 연구에서는 배경매질의 유속정보가 파형역산에 미치는 영향을 분석하기 위해 배경매질의 유속정보를 고려하는 파동 방정식 모델링을 활용하여 관측자료를 생성하고, 생성된 자료를 통해 수치 실험을 진행하였다. 수치예제에는 다소 비현실적인 유속이 적용된 결과도 포함되어 있다. 이와 더불어, 탐사자료의 유속정보를 수치적 기법으로 도출하여 역산을 수행하는 알고리즘을 제안하였다. 제안된 알고리즘은 수정된 Marmousi2 모델에 적용하여 유속에 따른 결과를 얻고자 하였다. 기존의 유속을 고려하지 않은 역산 결과와 제안된 알고리즘으로 수행한 역산 결과 비교를 통해 유속의 세기가 갱신되는 물성정보에 미치는 영향을 확인하였다.

• 한국화재소방학회논문지
• /
• 제23권5호
• /
• pp.125-132
• /
• 2009

본 연구는 자동화재탐지설비의 신뢰도 증진 및 국민의 안전 확보를 위한 정밀한 점검기구의 개발에 기여하기 위해 현장에 설치되어 있는 연기감지기를 검정기술기준과 동일한 시험내용으로 현장에서 성능 시험을 실시할 수 있는 시험기를 개발하고자 하였다. 그 결과 연기발생원으로 종이를 사용하고 히터를 40초 이내에 $400^{\circ}C$로 가열하여 시험이 가능하며, 광전식 연기감지센서를 통해 0~25%/m 연기농도의 측정 및 제어와 Fan의 rpm조절로 20~40cm/sec의 일정풍속 제어가 가능한 현장에서 좀 더 표준화되고 정밀한 성능시험이 가능한 휴대용 연기감도시험기를 개발하였다.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
• /
• pp.155-161
• /
• 1999

The land reclamation area of Saemangeum(Kunsan) is located between 126$^{\circ}$10' E~126$^{\circ}$50' E and 35$^{\circ}$35' N~356$^{\circ}$05'N at the western coast of the Korean peninsula. The are many small islands including extensive areas of semi-diurnally flooded and dewatered tidal flats. The reclamation area of Saemangeum has a range of 5.6m spring tide and the maximum tidal current speed is about 1.41m s-1 in ordinary spring tide. Most of the sediments deposited on the tidal flats are transported from the Geum river, the Manjyung river and The Dongjin river. The soil in this area consists of silty sand with the depth of 10m to 30m . The wind in winter is strong from the direction of northwest. In the past twenty years, land reclamation projects for agricutural purpose or industrial cocmplex have been mostly implemented along the western coast of Korea. Saemangeum coastal area is being constructed the33km sea dike and 40, 100ha reclamation area. The purpose of this study is to find the residual circulations in four seasons after the dike construction by a robust diagnostic and prognostic numerical model. Heat flux at the sea surface in January ,May , August , October was asopted on the basis on the daily inflow of solar radiation at the earth surface, assuming an average atomospheric transmission and no clouds , as a function of latitude and time of year(George L.P.J.E William, 1990). The discharge from the Geum , the Mankyung and the Dongjin rivers was adopted on the basis of experience formula of river flow in January , May ,August, October (The M. of C.Korea, 1993) . Water temperature and salinity along the open boundaries are obtained from the results of field observation s.