6,356 research outputs found
Electron beam induced degradation of CaS : Pb thin film phosphor grown by atomic layer deposition
No full textThe effects of electron (e)-beam irradiation on the luminescent and the materials properties of CaS: Pb films were investigated using structural and compositional analysis techniques. Continuous e-beam irradiation on CaS: Pb thin film for 180 min resulted in an approximately 60% decrease of cathodoluminescence (CL) intensity. Transmission electron microscopic analysis indicated that e-beam irradiation induced the precipitation of Pb. The decrease of CL intensity by e-beam irradiation was mostly caused by the decrease of Pb2+ luminescent center ion concentration due to the precipitation of Pb. E-beam irradiation also resulted in heavy carbonaceous contamination on the surface. The thickness of the carbonaceous layer was approximately 10 nm. (C) 2002 The Electrochemical Society
Automatic extension of Gene Ontology with flexible identification of candidate terms
No full textThis is a pre-copy-editing, author-produced PDF of an article accepted for publication in Bioinformatics following peer review. The definitive publisher-authenticated version is available online at: http://bioinformatics.oxfordjournals.org/cgi/reprint/22/6/665Motivation: Gene Ontology (GO) has been manually developed to provide a controlled vocabulary for gene product attributes. It continues to evolve with new concepts that are compiled mostly from existing concepts in a compositional way. If we consider the relatively slow growth rate of GO in the face of the fast accumulation of the biological data, it is much desirable to provide an automatic means for predicting new concepts from the existing ones. Results: We present a novel method that predicts more detailed concepts by utilizing syntactic relations among the existing concepts. We propose a validation measure for the automatically predicted concepts by matching the concepts to biomedical articles. We also suggest how to find a suitable direction for the extension of a constantly growing ontology such as GO.This work was supported by MOST/KOSEF through AITrc
Approximate homomorphisms on JB∗-triples
No full textAbstractIt is shown that for an approximate homomorphism f:J→B of a JB∗-triple J into a JB∗-triple B, there exists a unique ∗-homomorphism H:J→B near the approximate homomorphism
On unitary convex decompositions of vectors in a -algebra
No full textsummary:By exploiting his recent results, the author further investigates the extent to which variation in the coefficients of a unitary convex decomposition of a vector in a unital -algebra permits the vector decomposable as convex combination of fewer unitaries; certain -algebra results due to M. Rørdam have been extended to the general setting of -algebras
The effect of a periodic absorptive strip arrangement on an interior sound field in a room
No full textIn this paper we study the effect of periodically arranged sound absorptive strips on the mean acoustic potential energy density distribution of a room. The strips are assumed to be attached on the room's surface of interest. In order to determine their effect, the mean acoustic potential energy density variation is evaluated as the function of a ratio of the strip's arrangement period to wavelength. The evaluation demonstrates that the mean acoustic potential energy density tends to converge. In addition, a comparison with a case in which absorptive materials completely cover the selected absorptive plane shows that a periodic arrangement that uses only half of the absorptive material can be more efficient than a total covering, unless the frequency of interest does not coincide with the room's resonant frequencies. Consequently, the results prove that the ratio of the arrangement period to the wavelength plays an important role in the effectiveness of a periodic absorptive strip arrangement to minimize a room's mean acoustic potential energy density. (C) 2005 Acoustical Society of America
Environmental and Occupation Factors Associated with Vitamin D Deficiency in Korean Adults:The Korea National Health and Nutrition Examination Survey (KNHANES) 2010-2014
No full textWhile exposure to sunlight is a well-documented primary source of vitamin D supply, factors leading to vitamin D deficiency vary according to population characteristics. Using nationwide data from the Korea National Health and Nutrition Examination Survey (KNHANES), we aimed to investigate a diverse range of potential factors in association with vitamin D deficiency. Overall, 21,208 participants aged ≥20 years were selected from KNHANES conducted between 2010 and 2014. The associations between various environmental and occupational factors and vitamin D deficiency (defined as serum 25-hydroxyvitamin D [25(OH)D] < 20 ng/mL) were evaluated in logistic regression models after controlling for potential covariates and also after stratification for age and sex. Under given criteria, 15,138 (71.4%) participants were vitamin D deficient. Significant associations were observed between vitamin D deficiency and average environmental temperature and radiation, weekly walking frequency, type of occupation, and shift work. When participants were stratified by age and sex, we observed greater associations of vitamin D deficiency with walking frequency among young males (odds ratio [OR] and 95% confidence interval [95% CI]: 1.24 [1.05-1.47] for those walking <5 times per week compared to those walking ≥5 times per week) and shift work (OR [95% CI]: 1.40 [1.10-1.78] for those working at night compared to those working during the day). We also observed a significant association of vitamin D deficiency with educational attainment (OR [95% CI]: 1.43 [1.09-1.89] for those with ≤middle school compared to those with ≥high school) among older group of females. This study suggests that vitamin D deficiency is related to geographical conditions and subpopulation characteristics. The age and sex-specific associations may urge the effective promotion of vitamin D supply recommendations.</p
Dichomeris splendiptera Li & Park 2017
No full text17. Dichomeris splendiptera Li & Park, 2017 (Figs 29, 55) Dichomeris splendiptera Li & Park, 2017, In: Zhao et al.: 217. TL: China (Yunnan). Material examined: VIETNAM: Ninh Binh Province: 2♂, Cuc Phuong Nat. Park, 200 m, 23 iv 2006, leg. Park, Kim & Kang, gen. slide nos. CIS-6301, nklep042. Vinh Phuc Province: 1♂, Tam Dao Nat. Park, 950 m. 26 iv 2006, leg. Park, Kim & Kang, gen. slide no. nklep027; 1♀, same locality, 1000 m, 04 v 2005, leg. KT Park & SR Kim, gen. slide no. CIS-6677. Bac Kan Province: 1♂, Ba Be Nat. Park, 240 m, 21–26 vi 2008, leg. JB Heppner, gen. slide no. CIS-6362. Female genitalia (Fig. 55). Apophyses anteriores about 1/3 length of apophyses posteriors, dilated distally. Antrum membranous. Ductus bursae not clearly defined from corpus bursa; ductus seminalis broad, arising from near conjunction with corpus bursae. Corpus bursae elongated, corpus-ductus bursae complex about 3 times length of apophyses posteriors; accessory bursae arising from anteriorly; signum absent. Distribution. Vietnam (new record: Bac Kan, Ninh Binh, Vinh Phuc), Cambodia (Mondul Kili), China (Hainan, Yunnan). Remarks. The female is described and illustrated for the first time.Published as part of Park, Kyu-Tek, Bae, Yang-Seop, Zhao, Shengnan & Li, Houhun, 2020, Thirteen new species of genera Dichomeris Hübner, 1818 and Helcystogramma Zeller, 1877 (Lepidoptera, Gelechiidae, Dichomeridinae) with twenty-one newly recorded species from Vietnam, pp. 435-461 in Zootaxa 4821 (3) on page 457, DOI: 10.11646/zootaxa.4821.3.2, http://zenodo.org/record/440093
Photo-crosslinkable, thermo-sensitive and biodegradable Pluronic hydrogels for sustained release of protein
No full textThermo-sensitive and biodegradable hydrogels based on Pluronic tri-block copolymers were prepared by a photo-polymerization method. Two terminal hydroxyl groups in Pluronic F-127 were acrylated to form a Pluronic macromer. Photo-cross-linked Pluronic hydrogels prepared by UV radiation showed a gradually decreased swelling ratio with increasing temperature and exhibited a thermally-responsive change in the swelling ratio when the temperature was cycled between 10degreesC and 37degreesC. These hydrogels degraded slowly due to the cleavage of ester linkage in the acrylated Pluronic terminal end. When lysozyme, a model protein drug, was loaded in the hydrogels, bi-phasic protein release profiles were attained: a burst-free and rapid controlled release profile was initially observed for a one week period and a much slower sustained release was followed thereafter. The release rates could be controlled by varying the amount of Pluronic macromer for photo-polymerization.the Korea Science and Engineering Foundation,
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