A Snippet Retrieval Strategy Based on Element Weighting Model

2014 ◽  
Vol 36 (8) ◽  
pp. 1729-1744
Author(s):  
De-Xi LIU ◽  
Chang-Xuan WAN ◽  
Xi-Ping LIU ◽  
Min-Juan ZHONG ◽  
Teng-Jiao JIANG
Keyword(s):  
Author(s):  
Vincent Izard ◽  
Dominique Marmor ◽  
Anne Peron ◽  
Valérie Paradis ◽  
Gérard Benoît ◽  
...  

2019 ◽  
Vol 19 (19) ◽  
pp. 12309-12324 ◽  
Author(s):  
Maxime Prignon ◽  
Simon Chabrillat ◽  
Daniele Minganti ◽  
Simon O'Doherty ◽  
Christian Servais ◽  
...  

Abstract. Hydrochlorofluorocarbons (HCFCs) are the first, but temporary, substitution products for the strong ozone-depleting chlorofluorocarbons (CFCs). HCFC consumption and production are currently regulated under the Montreal Protocol on Substances that Deplete the Ozone Layer and their emissions have started to stabilize or even decrease. As HCFC-22 (CHClF2) is by far the most abundant HCFC in today's atmosphere, it is crucial to continue to monitor the evolution of its atmospheric concentration. In this study, we describe an improved HCFC-22 retrieval strategy from ground-based high-resolution Fourier transform infrared (FTIR) solar spectra recorded at the high-altitude scientific station of Jungfraujoch, the Swiss Alps, 3580 m a.m.s.l. (above mean sea level). This new strategy distinguishes tropospheric and lower-stratospheric partial columns. Comparisons with independent datasets, such as the Advanced Global Atmospheric Gases Experiment (AGAGE) and the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS), supported by models, such as the Belgian Assimilation System for Chemical ObErvation (BASCOE) and the Whole Atmosphere Community Climate Model (WACCM), demonstrate the validity of our tropospheric and lower-stratospheric long-term time series. A trend analysis on the datasets used here, now spanning 30 years, confirms the last decade's decline in the HCFC-22 growth rate. This updated retrieval strategy can be adapted for other ozone-depleting substances (ODSs), such as CFC-12. Measuring or retrieving ODS atmospheric concentrations is essential for scrutinizing the fulfilment of the globally ratified Montreal Protocol.


2020 ◽  
pp. 174702182097704
Author(s):  
Matthew R Kelley ◽  
Madison Strejc ◽  
Zoe L Walts ◽  
Yesenia Uribe ◽  
Leslie Gonzales ◽  
...  

Across seven experiments, the present article examined the influence of the number of part-set cues on order retention, as assessed by both reconstruction of order and serial recall tests. Historically, part-set cueing facilitation occurs when half of the items are provided as valid part-set cues on tests of order memory. Using a variety of list lengths (10 or 16), numbers of cues (0–14), and types of cues (full or partial), the present experiments showed disparate effects of the number of part-set cues on reconstruction and serial recall tasks. On reconstruction tests, a minimum number of full cues was required before part-set cueing facilitation was produced and the magnitude of facilitation increased as the number of cues increased. Generally, partial cues did not influence order retention until almost the entire list was provided as partial cues. On serial recall tests, part-set cueing facilitation was only evident with a few full cues. In contrast, part-set cueing impairment was the norm when many partial cues were provided. These results were largely consistent with predictions of the retrieval strategy disruption hypothesis, as well as with an anchoring account of part-set cueing for order.


1984 ◽  
Vol 9 (1) ◽  
pp. 19-28 ◽  
Author(s):  
G.O. Ofori-Dwumfuo

A retrieval program, called Thomas and described elsewhere, attempts to satisfy the user from structural models it builds of the user's problem area and its database. The retrieval strategy is based on a dialogue model between an information expert and an information seeker. This paper discusses an implemen tation of Thomas which incorporates weighting based on the strength of association between items in the database. Experi ments show that the new system, called Thomas-II, requires less effort from the user than Thomas.


2013 ◽  
Vol 278-280 ◽  
pp. 2016-2019 ◽  
Author(s):  
Jian Hua Song ◽  
Zheng Wang ◽  
Lei Zhang

This paper put forward a new retrieval strategy which combines character field matching algorithm with the NNH in Case-Based Reasoning. The new retrieval strategy can reduce the times of symptoms match while streamlining retrieved result, and lower the impact of large symptom value difference in the result. The superiority of the strategy is verified by three target cases.


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