1,721,205 research outputs found
다육식물 : CITES 대상 식물 관리 지침
No full text이 지침서의 목적은 ‘멸종위기에 처한 야생동식물 종의 국제 거래에 관한 협약(Convention on International Trade in Endangered Species of Wild Fauna and Flora, 이하 ‘CITES’)’ 및 ‘유럽 야생동물 무역 규정(European Wildlife Trade Regulations, 이하 ‘EU WTR’)’에 따라 국제 거래를 규제 받는 다육식물 종과 그 부분물과 파생물을 소개하고 CITES 부속서 등재, 적용할 수 있는 기술, 단속 상의 문제, 추가 지원이나 정보 확보를 위한 자료 등을 설명하는데 있다. 이 지침서는 물을 저장하거나 손실을 줄일 수 있는 하나 이상의 기관을 가진 다육식물과 건조한 환경을 견디어 생육할 수 있 는 식물에 대하여 다룬다. 전 세계적 분포를 고려할 때, CITES에 등재된 다육식물은 18개 과에 해당하며, 아주 작은 식물에 서 큰 나무의 형태까지 다양하다. 선인장, Aloe속 및 대극속 식물이 주로 거래되는 다육식물이다.
건조한 상황에서 살아남을 수 있는 식물의 능력과 난방 장치의 발달로 자생지 외에서도 재배가 가능해지면서 다육식물은 실 내에서 기르는 식물로 인기가 높아졌다. 또한 건조한 환경에 강한 식물로 조경을 하는 건식 조경(xeriscaping)에서 필수 요 소로 인식되며, 야생에서 보이는 독특한 성장형태 또는 희귀성으로 인해 많은 식물 수집가들의 각광을 받고 있다. 이 지침 서는 다육식물의 거래와 관련한 여러 가지 정보를 제공하며, 특히 비전문가에게 어려울 수 있는 종 식별법과 다육식물 그룹 간의 차이를 보여준다. 다육식물의 분류 방법이나 학명은 복잡할 수 있으며 CITES 부속서에는 개별 종이 기재되기도 아니 면, 속이나 과 명칭으로 기재되기도 한다. 다육식물을 다루는 경우, 부속서 목록과 관련 문제를 확실히 이해하기 위하여 가 능한 식물 또는 분류 전문가에게 연락하는 것을 추천한다. CITES 부속서 목록 및 이 지침서에서 사용된 용어의 정의는 100 쪽의 용어 해설을 참조하면 된다
Succulent Plants, A guide to CITES-listed species
Full text linkThis guide covers the main succulent species, other than cacti, regulated by the Convention on International Trade in Endangered Species (CITES). It provides information on the implementation of the Convention for these species with details on their distribution, uses, traded parts and derivatives, and scientific names. It is written for the non-expert and additional sections cover identification, guidance on CITES documentation and key resources
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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