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병렬 초근원성 테스트를 위한 최적 O(log log n) 시간 알고리즘
Costas S. lliopoulos(Costas S. lliopoulos),박근수(Kunsoo Park) 한국정보과학회 1994 정보과학회논문지 Vol.21 No.8
스트링 x가 스트링 w의 접합과 포갬에 의하여 구성될 수 있으면 w가 x를 덮는다라고 말한다. 스트링 x가 자신에 의해서만 덮어질 수 있으면, x는 초근원적이라고 한다. x가 그보다 작은 스트링에 의해서 덮어지면, x는 준반복적이라고 한다. 본 논문에서는 길이가 n인 스트링 x가 초근원적인지를 테스트하는 최적 O(log log n) 시간 CRCW PRAM 알고리즘을 제시한다. [7]에서 보인바와 같이, 본 알고리즘은 가능한 가장 빠른 시간 복잡도를 가진다. [7]에 발표된 이전 알고리즘들은 최적이 아니든지 시간 복잡도가 O(log log n)보다 크다. A string w covers a string x if x can be constructed by concatenations and superpositions of w. A string x is superprimitive if x is covered only by itself and is quasiperiodic if x is covered by a shorter string. We present an optimal O(log log n)-time algorithm on the CRCW PRAM which tests if a string x of length n is superprimitive. As shown in [7], the time complexity we obtained is the best possible. Previous algorithms in [7] are either non-optimal or have the time complexity more than O(log log n).
The pulsation modes of the pre-white dwarf PG 1159-035
Costa, J. E. S.,Kepler, S. O.,Winget, D. E.,O'Brien, M. S.,Kawaler, S. D.,Costa, A. F. M.,Giovannini, O.,Kanaan, A.,Mukadam, A. S.,Mullally, F.,Nitta, A.,Provenç,al, J. L.,Shipman, H.,Wood, M. A EDP Sciences 2008 Astronomy and astrophysics Vol.477 No.2
( Leonor Costa ),( Joana Costa ),( Deolinda Portelinha ),( Amilcar Silva ),( Adriano Rodrigues ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: Clostridium difficile infection (CDI) is a frequent cause of infectious colitis, usually occurring as a complication of antibiotic therapy, in elderly hospitalized patients. Is responsible for signifi cant morbidity and mortality, and remains at historically high levels, being a serious re-emerging pathogen. Methods: Retrospective study of adult patients admitted in the Medical Department of a Hospital Center, between 2005 and 2012, that meet the defi nition of CDI. Results: 100 patients were included, with an average age of 78, 6 years (± 10, 76), 68% of female sex. By age group 79,0% of patients were over 70 years and 48,0% exceed 80 years. The overall mortality of the patient group was 21%, being the mortality attributable to the infection by Clostridium as the main diagnostic 8%. The main risk factor found for the disease development was recent treatment with one or more antibiotics, 81% of cases, without a predominant class of antibiotic. Regarding the origin of the infection 56% were nosocomial, 44% associated with health care and 8% had origin in the community. In patients who started therapy with metronidazole, in 12% was switched to vancomycin (ascending to 50% in the patients that died from the infection). Conclusions: The epidemiology of CDI, is changing with increase infections in lowrisk patients, and the rising of the fatal cases. Indentifi ng CDI earlier is essencial, and saves lifes. Measures like prescribing antibiotics only when apropriate, test for CDI in patients with diarrhea and isolation, are crucial, specially with the alarming reality of the rising resistance to metronidazol, the possible future vancomicin resistence with its overuse, and the present lack of new effective therapeutic options, making this opportunistic infecction, a clinical challenge in the present and in years to come.
Bayesian estimation of tension in bridge hangers using modal frequency measurements
Papadimitriou, Costas,Giakoumi, Konstantina,Argyris, Costas,Spyrou, Leonidas A.,Panetsos, Panagiotis Techno-Press 2016 Structural monitoring and maintenance Vol.3 No.4
The tension of an arch bridge hanger is estimated using a number of experimentally identified modal frequencies. The hanger is connected through metallic plates to the bridge deck and arch. Two different categories of model classes are considered to simulate the vibrations of the hanger: an analytical model based on the Euler-Bernoulli beam theory, and a high-fidelity finite element (FE) model. A Bayesian parameter estimation and model selection method is used to discriminate between models, select the best model, and estimate the hanger tension and its uncertainty. It is demonstrated that the end plate connections and boundary conditions of the hanger due to the flexibility of the deck/arch significantly affect the estimate of the axial load and its uncertainty. A fixed-end high fidelity FE model of the hanger underestimates the hanger tension by more than 20 compared to a baseline FE model with flexible supports. Simplified beam models can give fairly accurate results, close to the ones obtained from the high fidelity FE model with flexible support conditions, provided that the concept of equivalent length is introduced and/or end rotational springs are included to simulate the flexibility of the hanger ends. The effect of the number of experimentally identified modal frequencies on the estimates of the hanger tension and its uncertainty is investigated.
Ana Carolina de Figueiredo Costa(Ana Carolina de Figueiredo Costa ),Everton Cavalcante da Silva(Everton Cavalcante da Silva ),Delane Viana Gondim(Delane Viana Gondim ) 대한정신약물학회 2022 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.20 No.4
This study aimed to conduct a meta-analysis of randomized controlled trials (RCTs) to evaluate the effects of the btulinum toxin-A (BT-A) in patiets with mood disorders. PubMed, Scopus, Web of Science, Cochrane Library and LILACS were searched without restrictions up to July 2022. The PICOS strategy was used for the selection of studies and risk-of-bias assessment was performed using Cochrane’s tool for RCTs. RCTs were included if they compared BT-A treatment on facial muscles in patients with mood disorders to placebo. After assessment of the full texts, seven studies were selected. Five studies had low risk of bias for the generation of random sequence and blinding of participants and professional domains. A total of four studies showed a low risk of bias for the allocation concealment and blinding of the evaluation of the domain results. The domain of selective reports showed a low risk of bias in all included studies. However, four studies presented a high risk of bias for the domain of other biases. The meta-analysis was based on the mean difference or standardized mean difference between the BT-A and placebo groups for each selected trial and revealed that the BT-A group showed a significant improvement in the symptoms of depression when compared to placebo. This study revealed that the BT-A application into mimic muscles of the upper third of the face improves the mood disorders, but it was not possible to guarantee whether the aesthetic benefits can contribute to reducing the severity of the depressive state.