177,020 research outputs found
Model zależności pomiędzy tętnczym ciśnieniem krwi a mózgowym przepływem krwi. Stan wiedzy i nowa propozycja
No full textCerebral autoregulation is a very important and complicated process to maintain adequate and stable cerebral blood flow. In current medical practice cerebral autoregulation is diagnosed using two measurements: cerebral blood flow (by Doppler Ultrasonography, Magnetic Resonance Imaging or Computed Tomography) and arterial blood pressure. The aim of our study is to determine the dependence of the cerebral blood flow (CBF) on the mean arterial pressure (MAP) by measuring blood pressure and cerebral blood flow using modelling and data processing. The dependence will be presented as a curve based on the Strandgaard's observation of cerebral blood flow changes in response to changes in the mean arterial pressure. These observations we have described using polynomials of degree n = 3, 4, 5 and 6. The four curves were identified using least-squares fitting to Strandgaard's measurements. As the best of the considered curves of degree n = 3, 4, 5 and 6 we choose the one for which the Akaike Information Criterion AIC reaches a minimum. The criterion in the minimum finds compromise between the goodness of fit of the curve to the data and the curve complexity. Minimum of AIC was obtained for n = 4 (Kalicka&Mazur curve). The modelled dependence of CBF on MAP was used in CBF(MAP) simulations for important and typical pressure values: normotensive, hypertensive and patients under unexpected stress. The model selected by the AIC informative criterion, degree n = 4, proved to be good candidate for describing CBF(MAP). This model (Kalicka&Mazur) gives CBF values which are comparable to those the measured for successive MAP values. The measured and the modelled Kalicka&Mazur curve CBF values differed less than the measured and the modelled CBF values of the Dirnagl&Pulsinelli curve and the Olsen curve.Autoregulacja przepływu mózgowego jest niezwykle ważnym i skomplikowanym procesem umożliwiającym utrzymanie stałych i stabilnych wartości przepływu mózgowego. Obecnie, zaburzenia autoregulacji są diagnozowane dwoma metodami: ocena przepływu mózgowego krwi na tętnicy szyjnej (przy użyciu USG Dopplera) oraz w tkankach mózgowych (przy użyciu rezonansu magnetycznego). Celem tej pracy jest określenie zależności pomiędzy mózgowym przepływem krwi (CBF) a średnim ciśnieniem tętniczym (MAP). Utworzona i wykorzystana zależność CBF(MAP) bazuje na pomiarach Strandgaard'a. Na podstawie tych pomiarów zostały utworzone wielomiany 3, 4, 5 i 6 stopnia poprzez dopasowanie ich, metodą najmniejszych kwadratów, do pomiarów Strandgaard'a. Informacyjne kryterium Akaike (AIC) pozwoliło na wybranie wielomianu stopnia 4 jako modelu osiągającego najlepszy kompromis pomiędzy dobrocią dopasowania krzywej do danych a złożonością krzywej (najmniejsza wartość AIC). Wielomian ten został nazwany krzywa Kalicka&Mazur. Tak przygotowana zależność CBF(MAP) posłużyła do symulacji wartości CBF dla najbardziej typowych wartości ciśnienia: dla pacjentów ze standardowym ciśnieniem tętniczym, dla pacjentów ze stale podwyższonym ciśnieniem tętniczym, a także dla pacjentów z nagłym skokiem ciśnienia tętniczego (pacjenci poddani nagłemu stresowi). Wybrany i zamodelowany wielomian 4 stopnia, krzywa Kalicka&Mazur, wydaje się być dobrym pomysłem na opisanie zależności zmiany CBF(MAP). Wartości zamodelowane dzięki krzywej Kalicka&Mazur w porównaniu z istniejącymi krzywymi Dirnagl&Pulsinelli czy Olsena daje bardziej obiecujące efekty przy porównaniu na danych rzeczywistych
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Letter from R. R. Zellick, Assistant Trust Officer, Anglo California National Bank of San Francisco, to Joseph R. Goodman, October 2, 1942
No full textLetter from R. R. Zellick, Assistant Trust Officer at The Anglo California National Bank of San Francisco, to Joseph R. Goodman, regarding property owned by Dave Tatsuno. Zellick mentions a dispute between current tenants and Tatsuno, and that Tatsuno has asked Goodman to help locate trustworthy tenants.Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Liftings for noncomplete probability spaces
No full textThe current state of knowledge concerning liftings for noncomplete probability spaces is discussed. This is a somewhat expanded version of the author's talk given at the 1991 Summer Conference on General Topology and Applications in Honor of Mary Ellen Rudin and Her Work.PT: S; CR: BURKE MR, IN PRESS P AM MATH S BURKE MR, 1991, ISRAEL J MATH, V73, P33 BURKE MR, 1992, ISRAEL J MATH, V79, P289 CARLSON T, THEOREM LIFTING CHRISTENSEN JPR, 1974, TOPOLOGY BOREL STRUC FREMLIN DH, 1989, HDB BOOLEAN ALGEBRAS, P877 INOESCUTULCEA A, 1966, 5TH P BERK S MATH ST, V2 IONESCUTULCEA A, 1967, CONTRIBUTIONS PROB 1, P63 IONESCUTULCEA A, 1969, TOPICS THEORY LIFTIN JECH TJ, 1978, SET THEORY JOHNSON RA, 1980, P AM MATH SOC, V80, P234 JUST W, IN PRESS T AM MATH S KUPKA J, 1983, INDIANA U MATH J, V32, P717 LOSERT V, 1983, LNM, V1080, P95 MAHARAM D, 1958, P AM MATH SOC, V9, P987 SHELAH S, 1983, ISRAEL J MATH, V45, P90 TALAGRAND M, 1982, P AM MATH SOC, V84, P379 VONNEUMANN J, 1931, CRELLES J MATH, V165, P109; NR: 18; TC: 0; J9: ANN N Y ACAD SCI; PG: 4; GA: BZ86BSource type: Electronic(1
Hansen, Lee (Lee R.). Union, non-union, and managerial pay plan state employees, 2008-2019
No full text1 online resource (2 pages)"July 1, 2021."Provides the number of union and non-union state employees in each of the last 14 years. Also provides the number of state employees paid under the state's managerial pay plan during each of those years. Updates OLR research report 2019-R-011
Letter from Joseph R. Goodman to Akiko Nishioka, May 27, 1942
No full textLetter from Joseph R. Goodman to Akiko Nishioka, regarding Japanese American students from the west coast who resettled at colleges and universities in the east.Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
- …
