OCR Quality Affects Perceived Usefulness of Historical Newspaper Clippings. A User Study

Publisher Copyright: © 2022 Copyright for this paper by its authors.Effects of Optical Character Recognition (OCR) quality on historical information retrieval have so far been studied in data-oriented scenarios regarding the effectiveness of retrieval results. Such studies have either focused on the effects of artificially degraded OCR quality (see, e.g., [1-2]) or utilized test collections containing texts based on authentic low quality OCR data (see, e.g., [3]). In this paper the effects of OCR quality are studied in a user-oriented information retrieval setting. Thirty-two users evaluated subjectively query results of six topics each (out of 30 topics) based on pre-formulated queries using a simulated work task setting. To the best of our knowledge our simulated work task experiment is the first one showing empirically that users' subjective relevance assessments of retrieved documents are affected by a change in the quality of optically read text. Users of historical newspaper collections have so far commented effects of OCR'ed data quality mainly in impressionistic ways, and controlled user environments for studying effects of OCR quality on users' relevance assessments of the retrieval results have so far been missing. To remedy this The National Library of Finland (NLF) set up an experimental query environment for the contents of one Finnish historical newspaper, Uusi Suometar 1869-1918, to be able to compare users' evaluation of search results of two different OCR qualities for digitized newspaper articles. The query interface was able to present the same underlying document for the user based on two alternatives: either based on the lower OCR quality, or based on the higher OCR quality, and the choice was randomized. The users did not know about quality differences in the article texts they evaluated. The main result of the study is that improved optical character recognition quality affects perceived usefulness of historical newspaper articles significantly. The mean average evaluation score for the improved OCR results was 7.94% higher than the mean average evaluation score of the old OCR results.Peer reviewe

Physical fitness of paramedic students during vocational training - a follow-up study

Introduction: Paramedics’ work includes periods of physically light activity, but also involves short periods of relatively intense physical activity.  Even during their studies paramedic students’ days involve a lot of sitting, i.e. physically sedentary behaviour. We initiated a programme to motivate paramedic students to be physically active during their studies. In this study we report physical fitness among paramedic students who for one year participated in brief physical activity counselling consisting of both verbal and a written individually tailored exercise programMethods: A total of 40 paramedic students (26 female, 14 male) had participated voluntarily in a physical activity programme alongside their studies. Subjects’ maximal oxygen consumption and muscle strength were measured at baseline and at one-year follow-up. According to the results of the baseline tests all students were given an individual exercise programme, which included aerobic and muscle strength training.Results: Sixty-five percent (26/40) of the students participated in the follow-up examinations. At baseline male students had higher mean maximal oxygen consumption (VO2Max) and, as expected, greater absolute muscle strength than their female counterparts (all p-values <0.05). During the follow-up females had improved their VO2Max on average by 2.4 ml/kg/min. Furthermore, females on average improved the number of squats  by 4.2 [95% Confidence Interval (CI) 0.01 to 8.33] repetitions, and males improved the number of push-ups (mean improvement 4.8, 95% CI 1.93 to 7.57), and left arm grip strength (mean improvement 4.0 kg, 95% CI 1.39 to 6.53).Conclusions: It seems to be possible to maintain, and even slightly improve paramedic students’ physical fitness with a self-directed, guided, home exercise programme. This approach could enhance prospective paramedics’ willingness to develop the necessary physical qualities long-term throughout their clinical careers.

Psyykenlääkkeet ja sydän

Vertaisarvioitu. English summaryMonet masennus- ja psykoosilääkkeet pidentävät QT-aikaa ja voivat siten altistaa käyttäjänsä äkkikuolemalle. Näiden lääkkeiden aloitus edellyttää riskinarviointia ja jatkuva käyttö muun muassa EKG-seurantaa. Varsinkin klotsapiini voi aiheuttaa kardiomyopatian tai ennen sitä myokardiitin, jonka ilmetessä lääkitys kannattaa keskeyttää. Monet psykoosilääkkeet huonontavat kardiologista riskiprofiilia, sillä ne lisäävät painoa ja muuttavat glukoosi- ja lipidiaineenvaihduntaa. Psyykenlääkehoitoja aloitettaessa kannattaa tehdä kardiovaskulaarinen riskinarvio, ja heti, kun potilaan psyykkinen tila sen sallii, puuttua erityisesti tupakointiin ja painon lisääntymiseen elintapainterventiolla tai jopa lääkitystä muuttamalla. Psyykenlääkkeiden sekä sydän- ja verisuonitautilääkkeiden välillä esiintyy merkittäviä yhteisvaikutuksia. Eräät masennuslääkkeet voivat aiheuttaa vuotokomplikaatioita tukosta estävien lääkkeiden ja antikoagulanttien kanssa. Yhteisvaikutusriski on erityisen suuri monilääkityillä vanhuksilla.Peer reviewe

Improved stability of black silicon detectors using aluminum oxide surface passivation

Publisher Copyright: © 2021 ESA and CNESWe have studied how high-energy electron irradiation (12 MeV, total dose 66 krad(Si)) and long term humidity exposure (75%, 75 °C, 500 hours) influence the induced junction black silicon or planar photodiode characteristics. In our case, the induced junction is formed using n-type silicon and atomic-layer deposited aluminum oxide (Al2O3), which contains a large negative fixed charge. We compare the results with corresponding planar pn-junction detectors passivated with either with silicon dioxide (SiO2) or Al2O3. The results show that the induced junction detectors remain stable as their responsivity remains nearly unaffected during the electron beam irradiation. On the other hand, the SiO2 passivated counterparts that included conventional pn-junction degrade heavily, which is seen as strongly reduced UV response. Similarly, after humidity test the response of the induced junction detector remains unaffected, while the pn-junction detectors passivated with SiO2 degrade significantly, for instance, the response at 200 nm reduces to 50% from the original value. Interestingly, the pn-junction detectors passivated with Al2O3 exhibit no degradation of UV response, indicating that the surface passivation properties of Al2O3 are more stable than SiO2 under the studied conditions. This phenomenon is further confirmed with PC1D simulations suggesting that the UV degradation results from increased surface recombination velocity. To conclude, the results presented here suggest that black silicon photodiodes containing Al2O3-based induced junction are highly promising alternatives for applications that require the best performance and long-term stability under ionizing and humid conditions.Peer reviewe

Analyzing gender clues in war-time letters

Many historians struggle with their information needs which cannot be directly served by the information access systems. Satisfying these needs often requires reasoning and interpretation of pieces of information in context, from user-specific viewpoints. One common need in studying historical phenomena is what indicates gender in historical text. We call such textual indicators ‘gender clues’ because they help satisfy information needs regarding the concept of gender. In this article, we analyze gender clues qualitatively and present a typology of them based on a set of private letters from the Second World War in Finland. We also discuss the general need to create metadata to support the historian’s explorations from specific viewpoints, especially in small and noisy collections that are common in the historical domain.publishedVersionPeer reviewe

Feasibility of written instructions in airway management training of laryngeal tube

Peer reviewe

Human PSEN1 Mutant Glia Improve Spatial Learning and Memory in Aged Mice

The PSEN1 ΔE9 mutation causes a familial form of Alzheimer’s disease (AD) by shifting the processing of amyloid precursor protein (APP) towards the generation of highly amyloidogenic Aβ42 peptide. We have previously shown that the PSEN1 ΔE9 mutation in human-induced pluripotent stem cell (iPSC)-derived astrocytes increases Aβ42 production and impairs cellular responses. Here, we injected PSEN1 ΔE9 mutant astrosphere-derived glial progenitors into newborn mice and investigated mouse behavior at the ages of 8, 12, and 16 months. While we did not find significant behavioral changes in younger mice, spatial learning and memory were paradoxically improved in 16-month-old PSEN1 ΔE9 glia-transplanted male mice as compared to age-matched isogenic control-transplanted animals. Memory improvement was associated with lower levels of soluble, but not insoluble, human Aβ42 in the mouse brain. We also found a decreased engraftment of PSEN1 ΔE9 mutant cells in the cingulate cortex and significant transcriptional changes in both human and mouse genes in the hippocampus, including the extracellular matrix-related genes. Overall, the presence of PSEN1 ΔE9 mutant glia exerted a more beneficial effect on aged mouse brain than the isogenic control human cells likely as a combination of several factors