Relevance feedback and cross-language information retrieval     

Viviane Moreira Orengo  Christian Huyck 《Information processing & management》2006

This paper presents a study of relevance feedback in a cross-language information retrieval environment. We have performed an experiment in which Portuguese speakers are asked to judge the relevance of English documents; documents hand-translated to Portuguese and documents automatically translated to Portuguese. The goals of the experiment were to answer two questions (i) how well can native Portuguese searchers recognise relevant documents written in English, compared to documents that are hand translated and automatically translated to Portuguese; and (ii) what is the impact of misjudged documents on the performance improvement that can be achieved by relevance feedback. Surprisingly, the results show that machine translation is as effective as hand translation in aiding users to assess relevance in the experiment. In addition, the impact of misjudged documents on the performance of RF is overall just moderate, and varies greatly for different query topics.  相似文献   

User-innovators and “local” information: The case of mountain biking     

Christian Lüthje  Cornelius Herstatt 《Research Policy》2005,34(6):951-965

In a study of innovations developed by mountain bikers, we find that user-innovators almost always utilize “local” information - information already in their possession or generated by themselves - both to determine the need for and to develop the solutions for their innovations. We argue that this finding fits the economic incentives operating on users. Local need information will in general be the most relevant to user-innovators, since the bulk of their innovation-related rewards typically come from in-house use. User-innovators will increasingly tend to rely on local solution information as the stickiness of non-local solution information rises. When user-innovators do rely on local information, it may be possible to predict the general nature of the innovations they might develop.  相似文献   

Identifying students’ perceptions of the important classroom features affecting learning aspects of a design-based learning environment     

Yaron Doppelt  Christian D. Schunn 《Learning Environments Research》2008,11(3):195-209

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Die Öffnung des Schulsystems: Fakt oder Fiktion?     

Prof. Dr. U. Trautwein  Prof. Dr. F. Baeriswyl  Prof. Dr. O. Lüdtke  Christian Wandeler lic. Phil. 《Zeitschrift für Erziehungswissenschaft》2008,11(4):648-665

Opening up educational paths and especially decoupling educational courses and final school qualifications are seen as important aspects of the modernization of Swiss education. The study presented here investigates to what extent this de-linking actually took place in the case of the Swiss canton Freiburg. 525 pupils from German-speaking schools were observed in their progress from the end of primary school (year 6) to the transfer into the upper secondary level Gymnasium (year 10) or into alternative educational routes. Indeed, almost half of the young people, who went to the Gymnasium, previously studied at a middle-level general secondary school and not the preparatory Progymnasium; a strong indication of decoupling. Furthermore, the study shows that entry into the upper secondary level Gymnasium is still possible for pupils despite weak performance at primary level. Irrespective of the evidence for an opening of the education system, the findings also show that attending a Progymnasium has a significant effect on school biographies. The chance of transferring into the upper secondary level Gymnasium is twice as high for graduates, who attended a Progymnasium, as for comparative pupils, who did not. Additionally, a privileged social background correlates with a high chance of entry into the upper secondary level Gymnasium.  相似文献   

Die FHStG-Novelle BGBl I 2007/89 – Fachhochschul-Recht aus trüber Quelle?     

Werner Hauser  Peter Reininghaus  Christian Schweighofer 《Zeitschrift für Hochschulrecht, Hochschulmanagement und Hochschulpolitik: zfhr》2008,7(3):70-80

Die Novelle BGBl I 2007/89 des FHStG führte zu einigen wesentlichen ?nderungen im Fachhochschul-Studienrecht. Sie brachte einerseits die Etablierung einer Studierendenvertretung im Fachhochschul-Bereich sowie andererseits Vorgaben für die (arbeitsrechtliche) Stellung von Lehrbeauftragten. Im folgenden Beitrag werden diese beiden Neuerungen dargestellt und einer kritischen Betrachtung unterzogen, wobei sich – dies sei vorweggenommen – einige Punkte als durchaus problematisch und daher verbesserungswürdig erweisen.  相似文献   

Communicative Functions of the Museum Lobby     

Christian Hviid Mortensen  Maja Rudloff  Vitus Vestergaard 《Curator: The Museum Journal》2014,57(3):329-346

In a time with a heightened focus on how museum architecture and exhibition design shapes the museum visit, the entrance space of museums, the museum lobby, is remarkably absent from the museum literature and research. Still, the museum lobby is the first encounter visitors have with the museum and the last impression that they take home and share with others. This article analyzes museum lobbies as communication spaces in order to identify the different functions afforded by such spaces. In an explorative study of five Danish museum lobbies, we offer a preliminary categorization of these functions that can be compared at a general level. Concrete examples will be used to discuss general issues such as the adaptive borders of lobby spaces and the counteracting effects of design. We suggest that the preliminary categorization provided here can form a foundation for further studies resulting in practical suggestions for design improvements.  相似文献   

酪蛋白磷酸肽-无定形磷酸钙、不同玷污层的处理和储存时间对牙本质粘接的影响(英文)     

Jun LIN  Wei-ying ZHENG  Peng-ruo-feng LIU  Ning ZHANG  Hui-ping LIN  Yi-jing FAN  Xin-hua GU  Oliver VOLLRATH  Christian MEHL 《Journal of Zhejiang University. Science. B》2014,(7)

研究目的:评价含有酪蛋白磷酸肽-无定形磷酸钙(CPP-ACP)的再矿化剂Tooth Mousse(TM)的使用、不同玷污层的处理以及样本储存时间对牙本质粘接微拉伸性能的影响。研究方法:将牙本质样本分成保留玷污层组和用15%乙二胺四乙酸(EDTA)处理90秒去除玷污层组。每组根据是否使用TM处理再分亚组。每个亚组分别用三种不同的粘结剂(两步法自酸蚀Clearfil SE Bond(CSE)、一步法自酸蚀G-Bond(GB)和全酸蚀Adper Single Bond 2(SB))与牙本质样本粘接,分别经过3天和6个月的去离子水储存。样本进行切割微拉伸测试并通过扫描电镜分析断裂界面模式。重要结论:经过再矿化剂TM预处理,可以减少牙齿的敏感性,并且对于这三种粘结系统经过长时间储存后的粘结性能没有影响。EDTA的处理对于长期储存的粘结性能没有显著影响。额外的TM和EDTA对短期(3天)粘接力会有效应,但对长期(6个月)的粘接力没有影响。  相似文献   

Why space matters in technological innovation systems—Mapping global knowledge dynamics of membrane bioreactor technology   总被引：1，自引：0，他引：1  

Christian Binz  Bernhard Truffer  Lars Coenen 《Research Policy》2014

Studies on technological innovation systems (TISs) often set spatial boundaries at the national level and treat supranational levels as a geographically undifferentiated and freely accessible global technological opportunity set. This article criticizes this conceptualization and proposes instead to analyze relevant actors, networks and processes in TIS from a relational perspective on space. It develops an analytical framework which allows investigating innovation processes (or ‘functions’) of a TIS at and across different spatial scales. Based on social network analysis of a co-publication dataset from membrane bioreactor technology, we illustrate how the spatial characteristics of collaborations in knowledge creation vary greatly over relatively short periods of time. This finding suggests that TIS studies should be more reflexive on system boundary setting both regarding the identification and analysis of core processes as well as in the formulation of policy advice.  相似文献   

Microfluidic platform for separation and extraction of plasma from whole blood using dielectrophoresis     

Crispin Szydzik  Khashayar Khoshmanesh  Arnan Mitchell  Christian Karnutsch 《Biomicrofluidics》2015,9(6)

Microfluidic based blood plasma extraction is a fundamental necessity that will facilitate many future lab-on-a-chip based point-of-care diagnostic systems. However, current approaches for providing this analyte are hampered by the requirement to provide external pumping or dilution of blood, which result in low effective yield, lower concentration of target constituents, and complicated functionality. This paper presents a capillary-driven, dielectrophoresis-enabled microfluidic system capable of separating and extracting cell-free plasma from small amounts of whole human blood. This process takes place directly on-chip, and without the requirement of dilution, thus eliminating the prerequisite of pre-processed blood samples and external liquid handling systems. The microfluidic chip takes advantage of a capillary pump for driving whole blood through the main channel and a cross flow filtration system for extracting plasma from whole blood. This filter is actively unblocked through negative dielectrophoresis forces, dramatically enhancing the volume of extracted plasma. Experiments using whole human blood yield volumes of around 180 nl of cell-free, undiluted plasma. We believe that implementation of various integrated biosensing techniques into this plasma extraction system could enable multiplexed detection of various biomarkers.  相似文献   

Characteristics impacting on session rating of perceived exertion training load in Australian footballers     

Tania Gallo  Stuart Cormack  Tim Gabbett  Morgan Williams  Christian Lorenzen 《Journal of sports sciences》2015,33(5):467-475

The relationship between external training load and session rating of perceived exertion (s-RPE) training load and the impact that playing experience, playing position and 2-km time-trial performance had on s-RPE training load were explored. From 39 Australian Football players, 6.9 ± 4.6 training sessions were analysed, resulting in 270 samples. Microtechnology devices provided external training load (distance, average speed, high-speed running distance, player load (PL) and player load_slow (PL_slow)). The external training load measures had moderate to very large associations (r, 95% CI) with s-RPE training load, average speed (0.45, 0.35–0.54), high-speed running distance (0.51, 0.42–0.59), PL_slow (0.80, 0.75–0.84), PL (0.86, 0.83–0.89) and distance (0.88, 0.85–0.90). Differences were described using effect sizes (d ±95% CL). When controlling for external training load, the 4- to 5-year players had higher s-RPE training load than the 0- to 1- (0.44 ± 0.33) and 2- to 3-year players (0.51 ± 0.30), ruckmen had moderately higher s-RPE training load than midfielders (0.82 ± 0.58), and there was a 0.2% increase in s-RPE training load per 1 s increase in time-trial (95% CI: 0.07–0.34). Experience, position and time-trial performance impacted the relationship between external training load and s-RPE training load. This suggests that a given external training load may result in different internal responses between athletes, potentially leaving individuals at risk of overtraining or failing to elicit positive adaptation. It is therefore vital that coaches and trainers give consideration to these mediators of s-RPE training load.  相似文献