• Title/Summary/Keyword: SPIDER

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Spider Net 방식 Network RTK-GPS측량의 반복재현성에 대한 실험연구 (A Experimental Study on the Repeatability of Network RTK-GPS with Spider Net Type)

  • 김선철;강상구;이진덕
    • 한국측량학회:학술대회논문집
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    • 한국측량학회 2007년도 춘계학술발표회 논문집
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    • pp.37-42
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    • 2007

  • A network of MAC type was constructed in the Gyeonggi-do area to analyze the usefulness and validity of the Network RTK-GPS. Six sites were selected to conduct GPS observation for 24 hours, and by determining the ITRF of each site, coordinates were determined in connection with IGS network. Then check points which were established in Gimpo area were observed at least 7 times by Network RTK at 20 secs of retrieval intervals. The result showed high accuracy in the difference between the coordinates determined immediately by the in-field network survey and the current performance was 1-2cm. Its biggest benefit is the expanded range of survey and efficiency of practice. In summary, it is proved that a network survey has the accuracy, scalability and efficiency and it is expected that the network survey will contribute to the cadastral survey.

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Maternal Body-mass Transfer to Offspring in the Matriphagous Spider, Amaurobius ferox (Amaurobiidae)

  • Kim, Kil-Won
    • Journal of Ecology and Environment
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    • 제32권3호
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    • pp.177-182
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    • 2009

  • The optimal strategy for semelparous females may involve adjustments in the relative investment in two fitness components, the number of offspring and the post-hatching investment per capita. To determine the pattern of maternal resource allocation to offspring in the matriphagous spider, Amaurobius ferox (Amaurobiidae), I investigated the relationship between maternal body-mass and the number of offspring, and quantified the transfer of maternal body-mass to the offspring via different forms of maternal provisioning (trophic egg-laying and matriphagy). There was a positive relationship between female body-mass and the number of offspring. However, Amaurobius mothers did not produce more trophic eggs when they had larger broods. Rather, spiderlings in larger A. ferox broods consumed larger quantities of maternal body-mass via matriphagy. Mothers transferred $28.8{\pm}6.5%$ of their body-mass to the spiderlings via trophic egg-laying, and an estimated $39.0{\pm}12.5%$ of their body-mass was transferred to the spiderlings via matriphagy.

  • https://doi.org/10.5141/JEFB.2009.32.3.177 인용 PDF KSCI