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                          时间:2019-03-20 15:20来源:未知 作者:anne 点击:
                          导读:此文是一篇岩土工程专业的硕士毕业论文SUMARRY,总共分成6个部分。对于不会写论文的summary部分的同学,可以看下本文的整个布局和框架,希望能给大家带来帮助。 1. Elsevier 爱思唯尔 目
                          1. Elsevier 爱思唯尔
                          Nowadays, without information retrieval(IR) system support, academic searching is like to find a rice grain in haystack. Just like the interpretation of Manning et al (2009), IR is as a process of unstructured materials found from a large collection in order to satisfy the information needsin academic field. In general, users prefer Google rather than other professional website and database. However, the role of IR makes it more easily to meet the information needs so that we should not ignore the professional database in the academic search field. As we know, Elsevier is a world-leading website and is also a big database, which not only publishes the articles, journals, books and scientific literatures of medical, but also provides the digital information solution service for customers in science and health field. In the present report, Elsevier will be chosen as an example of IR analysis.
                          2. Method方法
                          在本节中,将占用两种不同类型的搜索任务。在已知项搜索的第一个任务中,这意味着我们希望搜索我们知道的特定项,但不知道位置。在?#23548;?#20013;,我们采用了一个名为“材料科学与工程:A”的特殊期刊作为例子来评估爱思唯尔红外系统。我们尝试在搜索过程中输入正确的?#25512;?#20889;错误的项目,以测试结果中是否建议正确的拼写提醒和建议。可以使用“matarials”或“materials scence”等项作为测试的关键字来执行搜索。在第二个导论材?#31995;?#25628;索任务中,我们将通过“查找文章”部分查找“纳米材料定义”的相关文档进行搜索,以评估爱思唯尔红外系统。此外,本研究的另一个目的是利用精炼工具,如“Ti”,快速获得专业导论。可以快速搜索数据库中的相关资料。
                          In this section, two different types of searching tasks will be occupied. In the first task of known item search, which means we would like to search a particular item we know, but have no idea the location. In practice, we adopt a specific journal named “Materials Science and Engineering: A” as an example to evaluate Elsevier IR system. We tried to enter the correct as well as the misspelled items into the search process to test whether the correct spelling reminders and recommendations are suggested in the result. The search can be performed by using the items like “matarials” or “materials scence” as the key word for testing. In the second task of search for introductory materials, we would to find the relevant document of “definition of nanomaterials” through “find a article” section to search, in order to evaluate Elsevier IR system.In addition, another purpose of this research is to get professional introductionquickly using the refining tools, such as “titles”, “author name” and “journal or book titles” to quickly searched the relevant materials in the database. 
                          3. Result
                          Firstly, when the target item was input correctly, the exact target will be presented together with some relevant names of journals, books and webpages. In contrast, the test of spelling correction and suggestion function when facing simple typing error like “ materials scence” was also conducted. The Elsevier presents that “ No results were found in journals or books” on the left part of the screen. Obviously, the correction of misspell function is not that advanced in Elsevier. However, some webpages with the keyword “materials” were presented on the right. Then you can infer that nothing could be found even on the right side if multiple errors item “ matarials sicence” were input. Moreover, no reminder on the possible misspell was shown on the website.
                          In contrast, the Elsevier system would present three lists on journals, books and webpages based on the relevant degree to the searching query when the correct item “materials science” was input. However, no further directory with different orientations was listed so that it is difficult for users to identify the relevance between the query and the first results (Ryen W. White et al, 2006).
                          As to the introductory articles searching, many other options including “Year”, “Publication title” et al was available to refine your searching results at the beginning. For instance, 3912 results were found when “definition of nanomaterials” was input with detailed number distribution of different classification: year, publication title, topic and so on in refine filter. Therefore, the found result can be reduced to 14 when topic “nanotechnology” and year “2015” had been chosen make it more convenient for the users. When one article is chosen, recommended articles, citing articles together with the related book content were listed on the right side of the website to provide more options that the readers are interested in, which is considered as the reformulation process on query expansion. 
                          4. Analysis
                          As a global database, Elsevier is able to facilitate lots of users to search what they need effectively and accurately. However, there is still some space should be improved to make the service better. Take the known item searching as an example, the target results can be focused within a short time when the exact item was input. However, users can get nothing when a tiny error was typed. According to the research, more than 20% queries are misspelled due to various reasons (S. Cucerzan, 2004). As a result, the automatically correction of misspelled queries is urgent and necessary for the searching engines to develop and improve so that the information needs of the users can be met (Hargittai, 2006).
                          In general, the hierarchical faceted metadata mode that Elsevier applied on query refinement is well designed, including several metadata, such as author name, journal or book title, volume, issue and even page, which make it more precise for searching. At the same time, another level of refine filters involving “year”, “publication title” and “topic” et al could serve from another classification to broaden the users’ selection range, which can optimize the efficiency of searching (Ricardo & Berthier, 1999). What’s more, the query expansion function is well designed when one article or book is chosen under one query- three categories of expanding information will be listed as mentioned above. As a result, the retrieval performance of reformulate a query can be effectively improved (Olga Vechtomova, 2006). However, this kind of query expansion function does not show up before the articles or books list appears. Thus, the expanded queries are more related to the article that you choose from the list rather than the query that you input. This situation is acceptable if the article or book lists are highly consistent with the queries that users input. Nevertheless, what will happen if the relevance between the results and the queries is not so close? There may be a misleading to the users, which will result in waste of time.
                          Moreover, another potential drawback is also associated with the query reformulation process corresponded to the failed query search. When replacing the word “definition” by “introduction” from the query “definition of nanomaterials”, what we got form the results were only the articles or books with the key word “nanomaterials”, which indicated that it could be an improper query. However, no related queries or relevant topic involved in the reformulation process had been presented in the search results. In my opinion, this is a distinct disadvantage for an IR system since the loss of reformulation process can hardly exhibit a user-centered feature, which may attribute to the decreasing attraction from the users. At the same time, the failed design on reformulation process can also limit the exploration of users in query expansion (Ruthven, 2008).
                          5. Recommendation
                          As mentioned at the beginning of Analysis part, a distinct drawback of Elsevier system is the misspelling correction problem. No automatic correction or hint of incorrect query is shown when misspelling situation appears, which may lead to the loss of potential users after several failed attempts. As a consequence, I recommend that Elsevier should pay more attention on the new technology of automatically misspelled correction as well as the reminder function to a possible wrong query. In contrast, the corresponding function is well engaged in goggle scholar search engine, which owns large amount of users with fine experience (Duan, 2011).
                          Another recommendation is the navigation towards the hierarchical faceted metadata mode. For the IR system designers, how to support the hierarchical categories to facilitate the users has been an issue all the time. As described above, users can filter the results by refine the sub-categories. However, the number of results that users got is only the sum of individual number of the two sub-categories without other options, such as the results containing both sub-categories, leaving the users more tasks to seek their targets. Therefore, it is maybe an good idea that books and journals should be added with several key labels like the “key words” in the articles, which can provide convenience for the users to combine different topics (M. Hearst, 2006). 

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