Julkaisuarkisto
Viimeksi lisätyt
- Ladataan...Existence of Smooth Numbers in Short IntervalsJain, Sarvagy (Oxford University Press)
Let X ≥ y ≥ 2, and let u = log X/log y. We say a number is y-smooth if all of its prime factors are less than or equal to y. In this paper, we study the distribution of y-smooth numbers in short intervals. In particular, for y ≥ exp ((log X ) 2/3+ε), we show that the interval [x, x + h] contains a y-smooth number for almost all x ∈ [X, 2X ], provided h ≥ exp ((1 + ε ) ( 11/8 u log u + 4 log log X)), and X is sufficiently large depending ε. This result improves upon an earlier result by Matomäki. Additionally, we provide the corresponding ‘all intervals’ type result. Our approach relies on a strategically factorized Dirichlet polynomial, much like the earlier work of Matomäki. The improvement in our results stems from the integration of ideas introduced in the breakthrough work of Matomäki and Radziwiłł.
- Ladataan...Vulnerability and Adaptations to Climate Change in EU Protected Areas: A Natura 2000 Managers’ perspectiveZavattoni, Giorgio; Brommer, Jon E.; Hallman, Tyler; Kačergytė, Ineta; Nagy, Szabolcs; Pärt, Tomas; Pavón‐Jordán, Diego; Soultan, Alaaeldin; Xu, Yanjie; Gaget, Elie (Wiley)The Natura 2000 (N2K)—Europe's network of protected areas—is a key conservation instrument, but its effectiveness is challenged by climate change. We surveyed 382 N2K managers to investigate their perceptions of climate change and related site adaptation strategies. Warming and precipitation shifts were frequently reported as threats, with perceived vulnerability of N2K sites highest in the Mediterranean and lowest in the Boreal region. Our results suggest that the official N2K site information stored in the Standard Data Forms greatly under-report managers' assessment of vulnerability. 58% of the surveyed managers implemented adaptation strategies, which, when characterized following a resist–accept–direct (RAD) framework, aimed not only at resisting, but also at directing and accepting the effects of climate change. Managers also highlighted several barriers to the implementation of adaptation strategies, such as lack of funding, time, stakeholders’ consensus, and lack of knowledge on local vulnerability.
- Ladataan...MSS-PAE: Saving Autoencoder-based Outlier Detection from Unexpected ReconstructionTan, Xu; Yang, Jiawei; Chen, Junqi; Rahardja, Sylwan; Rahardja, Susanto (Elsevier BV)The Autoencoder (AE) is popular in Outlier Detection (OD) now due to its strong modeling ability. However, AE-based OD methods face the unexpected reconstruction problem: outliers are reconstructed with low errors, impeding their distinction from inliers. This stems from two aspects. First, AE may overconfidently produce good reconstructions in regions where outliers or potential outliers exist while using the mean squared error. To address this, the aleatoric uncertainty was introduced to construct the Probabilistic Autoencoder (PAE), and the Weighted Negative Log-Likelihood (WNLL) was proposed to enlarge the score disparity between inliers and outliers. Second, AE focuses on global modeling yet lacks the perception of local information. Therefore, the Mean-Shift Scoring (MSS) method was proposed to utilize the local relationship of data to reduce the false inliers caused by AE. Moreover, experiments on 32 real-world OD datasets proved the effectiveness of the proposed methods. The combination of WNLL and MSS achieved 45% relative performance improvement compared to the best baseline. In addition, MSS improved the detection performance of multiple AE-based outlier detectors by an average of 20%. The proposed methods have the potential to advance AE's development in OD.
- Ladataan...Työn merkityksellisyys ja median sivistyksellinen rooli yhä tehostetummassa media-alan tietotyössäTapanila, Katriina; Siivonen, Päivi (Kansanvalistusseura)
Media-ala on murroksessa teknologian muuttaessa tiedontuotantoa ja perinteisen median aseman heikentyessä. Organisaatioita ohjaa tehostamistarve, mutta samalla työn merkityksellisyyden kokemus on keskeinen. Median sivistyksellinen rooli säilyy muutoksessa.
Kysymme, mistä media-alan tietotyöntekijät ammentavat työnsä merkityksellisyyttä ja miten he kokevat sen yhteyden työn tehostamiseen. Tarkastelemme työn merkityksellisyyden ja työn tehostamisen välistä suhdetta median sivistyksellisen roolin näkökulmasta.
Aineisto koostuu valtakunnallisenta (n = 127) ja kohdeorganisaation henkilöstölle suunnatun (n = 87) kyselyn avovastauksista, jotka analysoimme temaattisella analyysilla. Tulosten mukaan yhteiskunnallinen vaikuttavuus ja kansalaisten palveleminen ovat keskeisiä merkityksellisyyden lähteitä toimituksellisessa työssä. Tärkeitä ovat myös työyhteisön hyväksi toimiminen ja työstä itselle koituva hyvä, kuten jatkuva kehittyminen.
Tehostamisen koettiin etenkin toimituksellisessa työssä vaikuttavan kielteisesti merkityksellisyyden kokemiseen ja sivistykselliseen rooliin. Median sivistyksellisen roolin varmistamiseksi media-ammattilaisten laadukkaalle työlle tulisi turvata riittävät resurssit.
- Ladataan...An unexpected pattern of tracer uptake on pulmonary ventilation/perfusion SPECT imaging: a case reportMaaniitty, Teemu; Noponen, Tommi; Saraste, Antti; Seppänen, Marko (Oxford University Press (OUP))