http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Comparison of two tests for seasonal variation
Marrero Osvaldo 한국통계학회 2023 Journal of the Korean Statistical Society Vol.52 No.1
Statistical analyses of seasonal variation are important in the medical and social sciences because the results from such analyses can help elucidate the environment’s impact on human activity, behavior, and health. Generally, we are concerned with a data set of just 12 frequencies over a one-year period, and both the sample size and the variation’s amplitude are small, features that complicate the analysis; to assist in these situations, statisticians have created specialized tests for such data. One of those tests is an optimal-power likelihood-ratio test, whose application can fail because of computational complications. We are interested in the practical application of the said likelihood-ratio test, and so we present previously unknown information about the following: (1) When is the likelihood-ratio test likely to fail, and what are the chances for such failure to happen? (2) If the likelihood-ratio test does fail, what other test should the researcher use? Also, we provide new insights as to when and why the likelihood-ratio test would fail. Thus, in this study, we round out and complete important information about the performance of the optimal-power likelihood-ratio test for seasonality. Our results are useful to researchers who plan to do an analysis of seasonal variation.
Jose M. Marrero,Hugo Yepes,Jacob Pastor,Pablo B. Palacios,Catalina Erazo,Patricio Ramo´n,Carlos Estrella 대한공간정보학회 2019 Spatial Information Research Vol.27 No.3
Currently, it is fairly widespread to use smartphones or tablets on field surveys to collect and geolocate damage data. However, geolocation is not a straight forward process and may give inaccurate results such as, for example when the size of the object to be surveyed is relatively small or the coverage of the satellite constellation (e.g. GPS) is inadequate due to obstacles and shadows present in urban areas. Moreover, the pressure that surveyors and technicians suffer during and after the impact of a natural hazard may make the whole geolocation process even more difficult. In this paper, we describe a methodology to overcome the issues of inaccurate records in five damage data surveys collected after the 7.8 magnitude earthquake that struck the coast of Ecuador in April 2016, together with the three administrative sources used to interpret the damage. We started off by homogenizing the various states of damage as charted in field and aerial surveys, including satellite imagery. We then resolved geolocation inaccuracies by using a set of algorithms that take into account the spatial context and the size of the building. These algorithms also flag the quality of the sources to ultimately compute a figure of the spatial distribution of the damage suffered by residential buildings, together with harm done to productive and social infrastructure. Without these preliminary proceedings, the geolocation inaccuracies of the damage data surveys would not have allowed for adequate and detailed risk assessment.
Geschwind, Jean-Franç,ois,Kudo, Masatoshi,Marrero, Jorge A.,Venook, Alan P.,Chen, Xiao-Ping,Bronowicki, Jean-Pierre,Dagher, Lucy,Furuse, Junji,de Guevara, Laura Ladró,n,Papandreou, Christo RADIOLOGICAL SOCIETY OF NORTH AMERICA 2016 Radiology Vol.279 No.2
<P>Purpose: To evaluate transarterial chemoembolization (TACE) use prior to and concomitantly with sorafenib in patients with unresectable hepatocellular carcinoma (HCC) across different global regions. Materials and Methods: GIDEON is an observational registry study of more than 3000 HCC patients. Patients with histologically, cytologically, or radiographically diagnosed HCC, and for whom a decision had been made to treat with sorafenib, were eligible. Patients were enrolled into the registry from 39 countries beginning in January 2009, with the last patient follow-up in April 2012. Detailed data on treatment history, treatment patterns, adverse events, and outcomes were collected. All treatment decisions were at the discretion of the treating physicians. Documented approval from local ethics committees was obtained, and all patients provided signed informed consent. Descriptive statistics, including minimum, median, and maximum, were calculated for metric data, and frequency tables for categorical data. Kaplan-Meier estimates with 95% confidence intervals were calculated for survival end points. Results: A total of 3202 patients were eligible for safety analysis, of whom 2631 (82.2%) were male. Median age was 62 years (range, 15-98 years). A total of 1511 (47.2%) patients underwent TACE prior to sorafenib; 325 (10.1%) underwent TACE concomitantly. TACE prior to sorafenib was more common in Japan and Asia- Pacific compared with all other regions (362 [71.3%] and 560 [60.3%] vs 12-209 [13.3%-37.1%]). Adverse events were reported in 2732 (85.3%) patients overall, with no notable differences in the incidence of adverse events, regardless of TACE treatment history. Overall survival was 12.7 months in prior-TACE patients, 9.2 months in non-prior-TACE patients, 21.6 months in concomitant-TACE patients, and 9.7 months in non-concomitant-TACE patients. Conclusion: Global variation exists in TACE use in sorafenib-treated HCC patients. The combination of TACE with sorafenib appears to be a well-tolerated and viable therapeutic approach. (C) RSNA, 2016</P>
Perinatal/Postnatal Study of D-003, a Mixture of Long-Chain Fatty Acids, in Rats
M.D. Rodriguez,J.E. Gonzalez,E.F. Leon,A. Gutierrez,G. Marrero,R. Gamez,H Garcia,,E Goicochea,Y. Rodriguez,A. Gomez 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.2
D-003 is a mixture of long-chain fatty acids isolated and purified from sugar cane wax with cholesterol-low-ering and antiplatelet effects. In order to further characterize the developmental toxicity during the treatment period from lategestation up to weaning of the offspring, pregnant females received 0 (control), 500, and 1,000 mg/kg/day D-003 daily byoral gavage beginning at day 15 of pregnancy and through gestation until day 21 postpartum. Maternal clinical signs, bodyweight, and food intake were measured at regular intervals during gestation and lactation. Live pups were weighed, sexed,and examined for developmental signs. One female and male of each litter were randomly selected to evaluate the reproduc-tive potential. There were no spontaneous or dose-related maternal deaths during the course of this study. The general healthand behavioral condition of offspring was good in all groups. No significant differences among groups were found in com-parisons of litter size, survival through the weaning period, sex ratio, and male and female weights. This peri- and postnatalstudy conducted with D-003 in rats indicated that treatment of the dam during late gestation and lactation did not show ad-versely effects on reproductive performance or fetal development over two generations.
Microstructure and Mechanical Properties of AA6082‑T6 by ECAP Under Warm Processing
T. Khelfa,J. A. Muñoz‑Bolaños,F. Li,J. M. Cabrera‑Marrero,M. Khitouni 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.8
An AA6082 alloy deformed by equal channel angular pressing (ECAP) was studied. Microstructural evolution of the alloyprocessed by ECAP with different passes were evaluated by using optical microscope, scanning electron microscopy coupledwith an electron backscattered diffraction (EBSD) detector and X-ray diffraction. Texture analysis showed the apparitionof two types of textures, one associated with shearing deformation and the second due to the recrystallization phenomena. Mechanical strength properties measured by tensile tests increased in the first ECAP pass, and then progressively diminisheddue to the presence of concurrent softening phenomena. Calorimetric analysis indicated a slightly increase in the recrystallizationtemperature of the deformed specimens. Also, the stored energy increased with increasing ECAP passes due to theproduction of new dislocations. The average geometrically necessary dislocation density, measured by EBSD, increased withincreasing ECAP passes. However, the rate of increase slows down with the progress of ECAP passes.
Ariadne Gutie´rrez Martı´nez,Balia Pardo,Rafael Ga´mez,Rosa Mas,Miriam Noa,Gisela Marrero,Maikel Valle,Haydee Garcı´a,Dayisell Curveco,Nilda Mendoza,Edy Goicochea 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.12
D-004 is a lipid extract obtained from Cuban royal palm fruits, consisting of a mixture of free fatty acids, that prevents prostate hyperplasia induced with testosterone in rodents. This study investigated the possible alterations due to D-004 of androgen-dependent development after exposure in utero and compared them with those due to finasteride. Rats were randomized into five experimental groups: a control group, three groups treated with D-004 at 500, 750, or 1,000 mg/kg/day,respectively, and a group treated with finasteride (10 mg/kg/day). Male rats were treated 10 weeks before and during mating. Female rats were treated for 15 days prior mating, during mating, during pregnancy, and until lactation (day 21) except for those treated with finasteride, which were only administered the drug on gestational days 12–21. All male offspring were monitored individually until necropsy after postnatal day 90. The results of the present study indicate that D-004 induced no alterations in androgen-dependent development after the exposure in utero. Also, the current study demonstrated a permanent reduction in anogenital distance and retention of nipples in adult male rats exposed to finasteride during late gestation. Significant alterations induced by exposure to finasteride were mainly in tissues dependent on dihydrotestosterone during development.