• 제목/요약/키워드: dove

검색결과 53건 처리시간 0.024초

Performance of novel dynamic installed anchors during installation and monotonic pullout

  • Kim, Youngho;Rosher, Lachlan Thomas
    • Geomechanics and Engineering
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    • 제18권2호
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    • pp.153-159
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    • 2019
  • This paper examines the results from three-dimensional dynamic finite element analysis undertaken to develop a new dynamically installed anchor (DIA). Several candidate shapes of new DIAs were selected after an investigation into previous researches of existing DIA designs. The performances of selected DIAs during the installation and loading in non-homogeneous clay were investigated through large deformation finite element (LDFE) analyses. Findings were compared to the current anchors in operation (i.e., Torpedo and Omni-Max DIA) to assess the viability of the new designs in the field. Overall, the anchor embedment depths of the novel DIAs lied under the results of OMNI-Max DIA. And also, the tracked anchor trajectory confirmed that, the novel DIAs dove deeper with stiffer travelling angle, compared to the OMNI-Max DIA. These elements are more critical and beneficial especially in a field where the achieved embedment depths are generally low.

돌기형 지오멤브레인에 의한 전단 메카니즘에 관한 실험 연구 (Experimental Study on Shear Mechanism Caused by Textured Geomembrane)

  • 이석원
    • 한국지반공학회:학술대회논문집
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    • 한국지반공학회 1999년도 토목섬유 학술발표회 논문집
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    • pp.57-68
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    • 1999
  • This paper summarizes the results of a study which uses the recently developed Optical Profile Microscopy technique (Dove and Frost, 1996) as the basis for investigating the role of geomembrane surface roughness on the shear mechanism of geomembrane/geotextile interfaces. The alternative roughness parameters which consider the direction of shearing are described. These directional parameters are compared with the existing roughness parameters, and the relationship between these directional and non-directional parameters are investigated. Then, the relationship between interface shear strength and surface roughness quantified at the interface is investigated. The results show that interface friction can be quantitatively related to the surface roughness of the geomembrane. The peak and residual interface strengths increase dramatically through the use of textured geomembranes as opposed to smooth geomembranes. For the smooth geomembranes, the sliding of the geotextile is the main shear mechanism. For the textured geomembranes, the peak interface strength is mainly mobilized through the micro-texture of the geomembrane, however, the residual interface strength is primarily attributed to macro scale surface roughness which pulls out and breaks the filaments from the geotextile. The results of this study can be extended to the other interfaces such as joints in rock mass, and also can be used to provide a quantitative framework that can lead to a significantly improved basis for the selection and design of geotextiles and geomembranes in direct contact.

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Exotic Seeds on the Feathers of Migratory Birds on a Stopover Island in Korea

  • Choi, Chang-Yong;Nam, Hyun-Young;Chae, Hee-Young
    • Journal of Ecology and Environment
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    • 제33권1호
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    • pp.19-22
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    • 2010
  • Migratory birds, by crossing significant ecological barriers, carry and may subsequently introduce exotic seeds into new ecological zones during period of migration. The study of epizoochory, which includes seed dispersal by adhesion to bird feathers, has been relatively neglected compared to the study of seed dispersal by frugivores. To determine whether exotic seeds are being imported to stopover islands by migrating birds, and to estimate the quantity of seeds of exotic species being introduced, we examined migratory birds that were captured in mist nets for attached exotic plant diaspores in 2008 and 2009 on Hongdo Island, Korea. From a total of 3,947 birds examined, we found exotic seeds of Japanese Chaff Flowers (Achyranthes japonica) attached to three species of migratory birds (0.08%; Eurasian Bittern Botaurus stellaris, Swinhoe's Rail Coturnicops exquisitus and Oriental Turtle Dove Streptopelia orientalis). Despite the low occurrence of A. japonica seeds on the external parts of birds, the results suggest that migratory birds may be potential dispersing agents for A. japonica, a species that is currently threatening native ecosystems on many islands in Korea.

건설진도율 산정을 위한 진도관리단위에 관한 연구 (Standardized Progress Measurement Package)

  • 정영수;강승희;진상윤;김예상;정문헌;박순찬
    • 한국건설관리학회:학술대회논문집
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    • 한국건설관리학회 2004년도 제5회 정기학술발표대회 논문집
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    • pp.565-570
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    • 2004
  • 건설진도율은 프로젝트 성과 측정 및 진행관리의 중요한 요소 중의 하나로서 이용되고 있으나, 작업 진도 산출기준 및 방법이 현장 상황에 따라 다르게 운영되기 때문에 진도 산출의 정확성이 각 현장 특성에 크게 의존되고 있는 실정이다. 즉, 현장별 공사 진행 상태 비교 시 상당한 오류-가 발생될 수 있으며, 그 신뢰도 역시 매우 떨어질 수 있다는 것을 의미한다 따라서 본 연구에서는 모든 현장의 공사 진행 상태를 같은 기준으로 파악이 가능한 전사 차원으로서의 공통 기준인 진도관리단위 및 평가요소를 정의하며, 이와 더불어 진도관리단위 적정성 평가 방안 및 진도산정모델의 프로세스를 제안하고자 한다.

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내장형 제어기를 위한 컴포넌트 소프트웨어 아키텍처 (Component Software Architecture for Embedded Controller)

  • 송오석;김동영;전윤호;이윤수;홍선호;신성훈;최종호
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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    • pp.8-8
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    • 2000
  • PICARD (Port-Interface Component Architecture for Real-time system Design) is a software architecture and environment, which is aimed to reduce development time and cost of real-time, control system. With PICARD, a control engineer can construct a control system software by assembling pre-built software components us ing interact ive graphical development environment. PICARD consists of PVM(Picard Virtual Machine) , a component library, and PICE(PIcard Configuration Editor). PVM is a real-time engine of the PICARD system which runs control tasks on a real-time operating system. The component library is composed of components which are called task blocks. PICE is a visual editor which can configure control tasks by creating data-flow diagrams of task blocks or Ladder diagrams for sequential logics. For the communication between PVM on a target system and PICE on a host computer, a simple protocol and tools for stub generation was dove]oped because RPC or CORBA is difficult to be applied for the embedded system. New features such as a byte-code based run time system and a simple and easy MMI builder are also introduced.

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주민서비스 [입체체험관] 프로젝트 - '중랑 한(HAN : Here And Now)마음 만들기' 마케팅을 위한 -

  • 김영희
    • 한국디지털정책학회:학술대회논문집
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    • 한국디지털정책학회 2007년도 춘계학술대회
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    • pp.117-126
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    • 2007
  • The current participative government has started to carry out Residents Service Reform that transforms the transmission system of suppliers' oriented convenience to one-stop tai for made civil and governmental integral ion service for the purpose of realizing universal Social Benefits in responding to increasing desires of people according to the changes of social and economic conditions by overcoming the existing limit of transmission system. This study has analyzed the status and problems of local autonomous organizations according to the innovation of support for the life of residents and in order to solve these problems, I present the implementation strategy of transmission system of civil and government cooperation tailor-made integral ion service through the project of "30 experiencing hall for Social Benefits, " which is a joint project of civil and government dove loped by Jungrang-gu. In addition, it aims for the completed accomplishments of this project to settle as eight largest services market ing brand in 30 method and also as the best strategic brand for the "establishment of network of civil and governmental cooperation" with suppliers of public services, suppliers of civil service, and residents, who are suppliers as well as potential customers, for solving problems of local communities.

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주체와 타자의 존재방식과 재현 양상 -이탈리아 이주문학을 중심으로- (Il riassunto Aspetto di ricomparsa e maniera d'essere di gli altri e il soggetto -sulla letteratura italiana della migrazione-)

  • 김희정
    • 이탈리아어문학
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    • 제32호
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    • pp.23-48
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    • 2011
  • Se siamo d'accordo la definizione di Deleuze e Guattari che la letteratura minore è la letteratura che costruisce una minoranza dentro la lingua maggiore, le scritture italofoniche sono la traduzione in pratica di un concetto della letteratura minore che fornisce modelli sostitutivi di espressione. Questa minoranza di bilingue, o più precisamente, multilingue autori e pratiche, acquisisce uno spazio dentro della cultura e la lingua italiana, che di conseguenza sono entrambi deterritorializzati. Lo stanziamento di italiano come lingua in cui sono scritti i testi italofonici richiede una pratica influenza linguistica e culturale. Questa ibridazione linguistica e letteraria riverbera la pluralità sociale presente nella moderna Italia, dove oltre un milione di immigrati provenienti da tutto il mondo vivono oggi. Questo collegamento tra il letterario e il sociale si diffonde il senso di deterritorializzazione linguistica per definire personificazioni di 'otherness', sia per i corpi degli immigrati stessi sia per la politica. I testi italofonici rapresentano contemporaneamente l'individuo e il collettivo, cioè, l'esperienza individuale e la vita delle comunità di immigrati.

경남지역(慶南地域)에 서식(棲息)하는 수렵조수류(狩獵鳥獸類)의 중금속(重金屬) 축적(蓄積) (Heavy Metal Concentrations of Some Game Species Captured in Kyeongsangnam-do, Korea)

  • 최재식;정위현;윤기식;이두표
    • 한국산림과학회지
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    • 제83권1호
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    • pp.6-11
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    • 1994
  • 경상남도(慶尙南道) 일대(一帶)에서 채집(採集)한 수렵조수류(狩獵鳥獸類) 4종(種)에 대한 중금속(重金屬)을 분석(分析)한 결과(結果), 일반적(一般的)으로 생체필수원소(生體必須元素)인 Fe, Zn, Cu의 농도(濃度) 수준은 국내(國內)의 비오염지역(非汚染地域)에서 채집(採集) 발표(發表)된 산림(山林) 조수류(鳥獸類) 및 수금류(水禽類)에 대한 분석결과(分析結果)와 비슷한 수준을 보이고 있는 것으로 나타났으나 오염원소(汚染元素)인 Pb와 Cd는 일부조직(一部組織)에서 백그라운드레벨을 넘어 높은 농도(濃度)를 나타내었다. 특(特)히 Pb의 경우 정상적(正常的)인 조직분포(組織分布) 패턴과는 달리 일부(一部) 근육조직(筋肉組織)에서 높은 농도(濃度)로 검출(檢出)되었으며 이것은 포획당시 산탄(霰彈)(Pb 탄알)에 의한 오염(汚染)인 것으로 판단(判斷)되었다. 또한 산탄(霰彈)에 오염(汚染)된 근육조직(筋肉組織)은 Pb 농도(濃度)가 높아 식용(食用)으로 부적합(不適合)한 것으로 평가(評價)되었으며 국민건강(國民健康) 측면(側面)에서 볼 때 앞으로 이에 관(關)한 연구(硏究)가 시급(時急)한 실정에 있다고 하겠다.

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한(韓).중(中).일(日)의 식생활문화(食生活文化) 비교연구(比較硏究) (II) - $14{\sim}19$세기, 일상식품(日常食品)을 중심(中心)으로- (A Study on the Comparison Among Korea, China and Japan Food Cultures (II) - From 14C to 19C, on the Daily foods -)

  • 안명수
    • 한국식생활문화학회지
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    • 제12권3호
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    • pp.353-364
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    • 1997
  • A study was carried out to compare the daily foods which were eaten during $14{\sim}19$ century among Korea (Chosun dynasty), China (Ming, thing dynasty), and Japan (Muromachi, Edo era). Specially, in Ming, Ching dynasty, Noodles and dumpling were cooked very often and in Muromachi, Edo era, many kinds of beans were used so much, and there were many kinds of steamed rice to compare with Korea and China. Also, in Japan at these era Woodong, Morisoba, and Somyen were used as favorite foods harbitually. 1. The crops were used as staple foods in three countries such as steamed rice, gruel, noodle, dumpling, rice cake etc. commonly. 2. In Chosun, a roe deer, deer, antelope, and wild boar were more favoite dishes than cow, chicken, and dog, generally people enjoyed to eat pork and chicken. In Ming Ching, pork, chicken, goose, dove, lamb, ass, and duck were used as food materials, also wild animals such as deer, rabbit, and monkey etc. were used. In Muromach era, wild animal as racoon dog, otter, deer, antelope, bear, were used as food materials, in early Edo era (Yayoi and Momoyama), beef and pork were used as daily foods but they were eaten decreasingly in Edo era. So in Japan at those era, the dishes prepared of fishes were more than those of meats. For example, Sushi was made from that time, people all over the world are enjoying to have Sushi at present time. 3. Also in these era, many kinds of vegetables and fruits were used in three countries, and new kinds of vegetables and fruits were introduced from foreign countries, for example, red pepper, pumpkin, sweet potato, potato in Korea, corn, sweet potato, red pepper in China, and water melon, pumpkin, corn, red pepper, marmellow, sweet potato, sugar beet in Japan.

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심해 무인잠수정 해미래와 실해역 탐사 (Development of a Deep-sea ROV, Hemire and its sea trial)

  • 최현택;이판묵;이종무;전봉환;이계홍;김기훈;류승철
    • 전자공학회논문지SC
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    • 제44권3호
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    • pp.70-76
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    • 2007
  • 해미래는 한국해양연구원 해양시스템안전연구소에서 해양수산부의 지원으로 2001년부터 6년에 걸쳐 순수 국내 기술로 개발한 6, 000m급 과학탐사용 섬해 무인잠수정이다. 해미래는 2006년 4월에 동해 1차 시도에서 1, 065m까지, 10월 동해 2차 시도에서 2, 026m 해저변까지, 11월에 필리핀 앞 태평양에서 5, 775m 해저변까지 시험 탐사를 성공적으로 수행하였다. 이로서 우리나라는 세계에서 4번째로 독자적인 섬해 무인 잠수정 설계 및 개발 기술을 확보하였으며, 앞으로 국가 전략 기술로서의 섬해 연구를 위한 기초를 마련하였다. 본 논문에서는 섬해 무인잠수정의 구성과 기능에 대하여 설명하고 해미래의 개발 및 시험 과정에 대하여 간단히 설명한다. 또한 첫 탐사를 위한 준비 과정과 3차례에 결친 시험 탐사 결과를 요약한다.