• 제목/요약/키워드: South Africa

검색결과 282건 처리시간 0.025초

Impacts of Ocean Currents on the South Indian Ocean Extratropical Storm Track through the Relative Wind Effect

  • Hyodae Seo;Hajoon Song;Larry W. O'Neill;Matthew R. Mazloff;Bruce D. Cornuelle
    • 한국기후변화학회지
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    • 제34권22호
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    • pp.9093-9113
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    • 2021
  • This study examines the role of the relative wind (RW) effect (wind relative to ocean current) in the regional ocean circulation and extratropical storm track in the south Indian Ocean. Comparison of two high-resolution regional coupled model simulations with and without the RW effect reveals that the most conspicuous ocean circulation response is the significant weakening of the overly energetic anticyclonic standing eddy off Port Elizabeth, South Africa, a biased feature ascribed to upstream retroflection of the Agulhas Current (AC). This opens a pathway through which the AC transports the warm and salty water mass from the subtropics, yielding marked increases in sea surface temperature (SST), upward turbulent heat flux (THF), and meridional SST gradient in the Agulhas retroflection region. These thermodynamic and dynamic changes are accompanied by the robust strengthening of the local low-tropospheric baroclinicity and the baroclinic wave activity in the atmosphere. Examination of the composite life cycle of synoptic-scale storms subjected to the high-THF events indicates a robust strengthening of the extratropical storms far downstream. Energetics calculations for the atmosphere suggest that the baroclinic energy conversion from the basic flow is the chief source of increased eddy available potential energy, which is subsequently converted to eddy kinetic energy, providing for the growth of transient baroclinic waves. Overall, the results suggest that the mechanical and thermal air-sea interactions are inherently and inextricably linked together to substantially influence the extratropical storm tracks in the south Indian Ocean.

북한지역에서 ASF발병 현황 및 남북수의협력에 관한 연구 (African Swine Fever Outbreak in North Korea and Cooperation between South and North Korea)

  • 조충희
    • 적정기술학회지
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    • 제6권1호
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    • pp.21-27
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    • 2020
  • 아프리카에서 시작돼 전 세계를 위협하는 ASF는 2018년 중국지역에서 발생해 아시아에 상륙하였고 2019년 5월 북한이 OIE에 ASF를 정식신고 함으로써 한반도 축산안보에 엄중한 위협으로 되었다. 1921년 영국의 수의병리학자 몽고메리는 동아프리카에서 풍토병으로 존재하던 치사율이 높은 바이러스에 의한 열성 돼지열병에 '아프리카돼지열병 African swine fever(ASF),'이라는 이름을 달아 세상에 알렸다. 아프리카지역에서 풍토병으로 유행하던 ASF는 1957년경 포르트갈에 상륙하여 포르투갈 리스본의 농장을 휩쓸었다. ASF는 계속하여 스페인과 포르투갈에 정착하여 1990년대 말까지 40년 동안 피해를 주었으며, 1978년에 이탈리아의 사르디니아섬에 상륙하여 현재진행형이다. 2007년에 흑해 연안의 죠지아 공화국의 포티항구에 상륙한 바이러스는 러시아까지 퍼졌고, 2018년에 중국에 침입하여 막대한 피해를 주면서 베트남, 라오스, 미얀마 등지로 급속히 퍼지다가 2019년 5월 북한에서 발병하여 전국에 확산되어 양돈업계에 막대한 피해를 주었으며 현재 진행형이다. 북한에서의 발병사실 확인후 불과 3개월 만에 2019년 9월 16일 파주와 연천의 농가에서 발병이 확인되면서 한국도 ASF발병국의 오명을 가지게 되었으며 ASF의 전국확산은 막았지만 야생 멧돼지에서 현재 진행형이다. 남북한에서 현재 진행중인 ASF가 토착화된다면 양돈산업은 물론 한반도 경제에 막대한 피해를 주는 역대 급 재앙으로 될 것이다. 현재의 상황상 ASF 발병으로 인한 위험요인을 배제하고, 남한지역에 국한된 수의방역에만 치중할 수 없다. 현재 북한의 열악한 수의방역현실로는 ASF발생으로 인한 양돈업계의 피해를 방지하기 어렵고, 지리적으로 각종 유행성 전염병의 발병위험이 높은 중국과 인접되어 있어 국경지역에 대한 검역과 방역을 남북한이 공동으로 진행하여야 할 필요성이 제기된다. 우선 한반도공동방역체계를 구축하기전 과제로 ASF 및 기타 질병에 대한 신속한 정보교류와 교육이 필요하다고 생각한다. 북한의 ASF발생지역 및 중국, 러시아 접경지역에 대한 철저한 방역과 소독을 실시하고 유통되는 가축 및 축산물에 대한 철저한 검역과 통제 등을 공동으로 진행하는 것이 중요하다. 모든 수단과 방법을 동원하여 한반도에서 ASF의 장기화를 막아 한반도 축산안보를 보장하기 위한 남북한 수의방역업계의 협력이 필수적이다.

베리오그램 모델에 따른 크리깅 보간법의 정확성 (Accuracy of Kriging interpolation method with respect to variogram model)

  • 우광성;신영식;이희정
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2008년도 정기 학술대회
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    • pp.160-165
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    • 2008
  • Kriging interpolation technique has been proposed by Danny Krige of South Africa to find the mineral distribution grade from information of geography and space. It is one of the generally used prediction technique for the mineral distribution grade and underground water level in wide scope also used in computer graphics fields by the ability for the surface regeneration This paper comprises two specific objectives. The first is to examine the applicability of Ordinary Kriging interpolation(OK) to finite element method that is based on variogram modeling in conjunction with different allowable limits of separation distance. The second is to investigate the accuracy according to theoretical variogram such as polynomial, Gauss, and spherical models.

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Institutional Repositories in BRICS Countries: A Study

  • Dhanavandan, S.;Tamizhchelvan, M.
    • International Journal of Knowledge Content Development & Technology
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    • 제5권1호
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    • pp.33-47
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    • 2015
  • An institutional repository includes digital assets generated by academics, such as administrative documents, course notes, learning objects, or conference proceedings. It will provide a window that gives open access to improve the sponsoring institution's visibility and status. This paper discusses the growth and development of Institutional Repositories available in BRICS Countries. The relevant data was collected from the directory of OpenDOAR. Based on the data in OpenDOAR, 242 repositories are represented from BRICS countries. Among the 242, 84 (34.71%) repositories are from Brazil, 39 (16.12%) from China, 68 (28.10%) repositories from India, 22 (9.109%) repositories from Russia, and 29(11.98%) repositories from South Africa. Brazil has the largest number of records (11, 17,688) among BRICS Countries repositories.

New Record of Nomeus gronovii (Pisces: Nomeidae) from Korea

  • Lee, Soo Jeong;Kim, Jin-Koo;Lee, Won-Chan;Kim, Jeong Bae;Kim, Hyung Chul
    • Fisheries and Aquatic Sciences
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    • 제18권3호
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    • pp.317-320
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    • 2015
  • A new record of Nomeus gronovii is described here based on a single specimen collected off the Jeju Island, Korea. The species has a blotched and spotted pattern on the body, 41 vertebrae, and a large pectoral fin with a white lower part. A molecular analysis of the partial (500 bp) cytochrome c oxidase subunit I gene showed that this specimen is closely related to specimens of N. gronovii collected in South Africa (Kimura-two-parameter distance = 0.006-0.012). A new Korean name, "Ga-neun-dong-gang-yeon-chi", is proposed for this species.

석탄의 고온열분해시 황화합물의 거동 연구 (Behavior of Sulfur-containing Compounds in High Temperature Pyrolysis of Coals)

  • 정봉진
    • 에너지공학
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    • 제11권3호
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    • pp.269-275
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    • 2002
  • 철광석 용융환원 공정에서 석탄의 고온열분해시 석탄중에 함유된 황화합물의 거동을 파악하기 위한 기초실험을 수행하였다. 사용된 시료는 역청탄인 호주산 Hunter및 Mt. Thorley와 남아프리카의 Ensham 석탄이며, 반응온도 800~110$0^{\circ}C$ 사이에서 황화합물의 종류와 발생량을 분석하였다. 황함유 가스화할물은 주로 H$_2$S의 형태로 배출되며, COS및 CS$_2$가 미량 배출되었다. 또한 석탄중의 황화합물이 가스 및 타르의 휘발성물질과 석탄촤로 약 50%:50% 정도로 분배되었다.

구제역(口蹄疫) 종합대책 (Comprehensive Measures for Foot and Mouth Disease(FMD))

  • 이성갑;박용배
    • 기술사
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    • 제44권2호
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    • pp.34-38
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    • 2011
  • Foot and mouth disease (FMD) is a highly contagions disease of cloven-hoofed animals and occurs in many non-European countries, in particular in huge parts of Asia including Turkey, in most countries of Africa and in parts of South America. The extreme contagiousness of the disease requires comprehensive to control an outbreak, causing high economic losses. The outbreak of FMD, which affects livestock including cattle, swine,sheep,goats,deer and other animals as a highly communicable disease that affects. The agency issued a statement noting that FMD disease does not spread to humans. The disease and meat from infected animals are news reports that more than 3.400.000 livestock have been ordered slaughtered so far across the country.

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제39회 한일기술사 합동심포지엄 특집 - 녹색성장(Green Growth) 시대의 기술사의 역할 (The introduction of the age of Green Growth and the Role of Professional Engineers)

  • 이강건
    • 기술사
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    • 제43권1호
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    • pp.26-31
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    • 2010
  • The changes of climate and earth environment caused by Global Warming has seriously occurred recently. For instance, the water in the Chad Lake in Africa has continuously disappeared and Tuvalu in the South Pacific is facing a serious natural disaster with that the entire country is sinking under the sea. These natural disasters become a serious risk threatening the existence of the human-race. Therefore, we needs a fundamental measure to prevent Global Warming. That is a natural phenomenon that makes the earth warmer by 6 types a greenhouse gas including $CO_2So$ we look for an answer from the 'Green Growth' movement.

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뇌수막종과 동반된 뇌폐흡충증 - 증례보고 - (A Case of Cerebral Paragonimiasis Combined with a Meningioma - A Case Report -)

  • 김태완;임창수;박상무;지문표;김재오;김정철
    • Journal of Korean Neurosurgical Society
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    • 제29권6호
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    • pp.800-804
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    • 2000
  • Cerebral paragonimiasis is an important parasitic infestation found in Eastern Asia, West Africa, and Central/South America. It is frequently associated with abscess, granuloma or cystic lesions in chronic stage. Chronic symptoms include seizure, visual disturbance, movement and perception disorders, usually resulting from the spaceoccupying lesions. The authors report a case of chronic cerebral paragonimiasis combined with meningioma. A 69-year-old man presented with generalized seizure and impaired consciousness. CT scan and MR image of the brain revealed two intracranial lesions ; one was cerebral paragonimiasis in the left temporo-occipital lobe, and the other a huge falx meningioma. Two lesions were successfully removed in staged operations and the generalized seizure was controlled after removal of the cerebral paragonimiasis.

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The Utilization of e-resources at Modibbo Adama University of Technology (MAUTech), Yola, Adamawa State, Nigeria

  • Joshua, Dauda;King, Lizette
    • International Journal of Knowledge Content Development & Technology
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    • 제10권1호
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    • pp.47-70
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    • 2020
  • This article examines the utilization of e-resources Modibbo Adama University of Technology, (MAUTech) Yola under the auspices of the central library, the Ibrahim Babangida Library. Academics and students are primary users of information resources of any library, hence, their responses towards the utilization of e-resources in the institution have been critically considered in this study. A Mixed method research Design was adopted for the study. A case study approach was employed. The Technology Acceptance Model (TAM) and Diffusion of Innovation (DoI) theories were used to develop the conceptual framework of this paper. Questionnaires were used as data gathering tools. Academics and students acted as participants. Major findings are lack of sufficient Internet access for academics and students and lack of training and awareness campaigns. Conclusion has shown that e-resources did not impact research and teaching of academics in MAUTech, Yola.