Bibliografias temáticas / RBTC

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Literatura científica selecionada sobre o tema "RBTC"

Autor: Grafiati

Publicado: 14 de março de 2023

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Artigos de revistas sobre o assunto "RBTC"

Braun, Burkhard R., W. Steven Head, Ming X. Wang e Alexander D. Johnson. "Identification and Characterization of TUP1-Regulated Genes in Candida albicans". Genetics 156, n.º 1 (1 de setembro de 2000): 31–44. http://dx.doi.org/10.1093/genetics/156.1.31.

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Abstract TUP1 encodes a transcriptional repressor that negatively controls filamentous growth in Candida albicans. Using subtractive hybridization, we identified six genes, termed repressed by TUP1 (RBT), whose expression is regulated by TUP1. One of the genes (HWP1) has previously been characterized, and a seventh TUP1-repressed gene (WAP1) was recovered due to its high similarity to RBT5. These genes all encode secreted or cell surface proteins, and four out of the seven (HWP1, RBT1, RBT5, and WAP1) encode putatively GPI-modified cell wall proteins. The remaining three, RBT2, RBT4, and RBT7, encode, respectively, an apparent ferric reductase, a plant pathogenesis-related protein (PR-1), and a putative secreted RNase T2. The expression of RBT1, RBT4, RBT5, HWP1, and WAP1 was induced in wild-type cells during the switch from the yeast form to filamentous growth, indicating the importance of TUP1 in regulating this process and implicating the RBTs in hyphal-specific functions. We produced knockout strains in C. albicans for RBT1, RBT2, RBT4, RBT5, and WAP1 and detected no phenotypes on several laboratory media. However, two animal models for C. albicans infection, a rabbit cornea model and a mouse systemic infection model, revealed that rbt1Δ and rbt4Δ strains had significantly reduced virulence. TUP1 appears, therefore, to regulate many genes in C. albicans, a significant fraction of which are induced during filamentous growth, and some of which participate in pathogenesis.

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Fujishiro, Noriko, Shuichi Mitsunaga, Akira Shinohara, Misaki K. Takeno, Hideki Funazaki, Gen Kimura, Kazuo Watanabe et al. "Frequency of severe neutropenia occurring as an adverse events of gemcitabine plus cisplatin chemotherapy in patients with recurrent biliary tract cancer compared to those with unresectable biliary tract cancer." Journal of Clinical Oncology 35, n.º 4_suppl (1 de fevereiro de 2017): 488. http://dx.doi.org/10.1200/jco.2017.35.4_suppl.488.

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488 Background: In patients (pts) with biliary tract cancer (BTC), relapse occurs at a high frequency even after curative resection. It remains unclear whether in pts with postoperative recurrence receiving chemotherapy, the surgery exerts any influence on the risk of development of toxicities. The aim of this study was to compare the outcomes and incidences of adverse events between recurrent BTC (rBTC) pts and unresectable BTC (uBTC) pts receiving gemcitabine plus cisplatin chemotherapy (GC). Methods: Data of pts with rBTC or uBTC receiving GC as the first-line chemotherapy were analyzed. The GC regimen consisted of gemcitabine 1000 mg/m2 plus cisplatin 25 mg/m2on days 1 and 8, administered every 3 weeks. All adverse events occurring during the first 180 days of GC were evaluated according to CTCAE, version 4.0. Results: A total of 151 pts, including 55 pts with rBTC and 96 pts with uBTC, were enrolled. In regard to the baseline characteristics, no significant differences between the rBTC and uBTC groups were found in the gender distribution [male: 69% vs. 57%], age [median: 68 vs. 68], or ECOG performance status (PS) [PS0: 67%vs. 55%]. The distribution of the primary tumor site (intrahepatic bile duct [27% vs. 33%] / extrahepatic bile duct [45% vs. 20%] / gallbladder [20% vs. 44%] / ampulla [7% vs. 3%]) was unbalanced between the two groups ( p < 0.01). The overall survival (OS) was significantly longer in the rBTC group than that in the uBTC group [median 15.8 months vs. 10.0 months, p = 0.02], however, there was no significant difference in the progression-free survival [median 6.8 months vs. 5.8 months] between the two groups. Grade 3-4 neutropenia was more frequent in the rBTC group [69%] as compared to that in the uBTC group [44%, p < 0.01], whereas Grade 3-4 cholangitis was significantly less frequent in the rBTC [5%] group than that in the uBTC group [21%, p = 0.02]. Conclusions: The incidence of Grade 3-4 neutropenia developing during GC was significantly higher in the rBTC group as compared to that in the uBTC group.

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Canales-Rodríguez, Citlalin, Ana Paola Martínez-Falcón, Alfredo Ramírez-Hernández e Aurelio Ramírez-Bautista. "Diversidad de Copestylum Macquart, 1846 (Diptera: Syrphidae) asociados a cactáceas (Cactaceae Juss, 1789) en descomposición en dos Reservas de la Biosfera de México central". Cuadernos de Biodiversidad, n.º 60 (4 de fevereiro de 2021): 1. http://dx.doi.org/10.14198/cdbio.2021.60.01.

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El conocimiento de la biodiversidad de los sírfidos (Diptera: Syrphidae) en las zonas semiáridas de México, es muy limitado, sobre todo, al relacionado con las cactáceas en descomposición. Este estudio aporta un inventario faunístico de los sírfidos del género Copestylum asociados a los tejidos en descomposición de los cactus de matorrales crasicaules en dos Reservas de la Biosfera, “Barranca de Metztitlán” (RBBM) y “Tehuacán-Cuicatlán” (RBTC), ambas situadas en el centro de México. Se analiza la diversidad y composición de especies de sírfidos en ambas reservas y se documenta la especie de cactus a la que se asocian las larvas de estos dípteros durante la época de lluvias. El método de recolecta fue mediante búsqueda directa de estados inmaduros que se desarrollan en tejidos de cactáceas en descomposición. Se obtuvieron 137 ejemplares de sírfidos pertenecientes a 10 especies entre las dos reservas estudiadas. Los resultados indican que no existen diferencias significativas en la riqueza de especies entre ambas reservas, pero sí hay diferencia al comparar la diversidad de orden q2. En la RBBM, la especie dominante fue Copestylum latum, mientras que Copestylum posticum fue la especie dominante en la RBTC. La especie de cactus determina la segregación de sírfidos en cada reserva. En la RBBM, las especies de sírfidos se asociaron a las especies de cactus Isolatocereus dumortieri y Myrtillocactus geometrizans, mientras que, en la RBTC fueron Neobuxbaumia mezcalensis, Pachycereus hollianus y Myrtillocactus geometrizans.

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Arendt, Łukasz. "Czy polski rynek pracy zmierza ku polaryzacji?" Olsztyn Economic Journal 13, n.º 3 (26 de junho de 2018): 309–22. http://dx.doi.org/10.31648/oej.2755.

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W artykule podjęto problematykę charakteru zmiany technologicznej na polskim rynku pracy, skupiając się na dwóch dominujących obecnie w literaturze przedmiotu koncepcjach: zmiany technologicznej faworyzującej wysokie kwalifikacje (SBTC) i postępu technicznego ukierunkowanego na rutynizację (RBTC). Celem była weryfikacja hipotezy o polaryzacji polskiego rynku pracy. W przedstawionej w artykule analizie empirycznej wykazano, że zmiany na polskim rynku pracy odbiegają od ścieżki polaryzacji charakterystycznej dla krajów rozwiniętych. Okazuje się bowiem, że największy spadek popytu na pracę nie wystąpił w grupach zawodów zlokalizowanych w środkowej części rozkładu kwalifikacji/płac. Zmiana technologiczna spowodowała ogólny wzrost zapotrzebowania na wysokie kwalifikacje, jednocześnie zatrudnienie i płace w grupie pracowników o niskich kwalifikacjach istotnie się nie pogorszyły. Doszło również do znacznych zmian w strukturze zadań wykonywanych na poszczególnych stanowiskach pracy. Kierunek tych zmian jest podobny do trendów zidentyfikowanych w krajach rozwiniętych, z wyjątkiem popytu na rutynowe zadania kognitywne, na które w Polsce w ciągu ostatniej dekady zapotrzebowanie wzrosło. Wyniki analizy są niejednoznaczne - zmiany w strukturze zatrudnienia i wynagrodzeń w Polsce lokują się między scenariuszami wynikającymi z hipotez SBTC i RBTC.

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Ramírez-López, Xareni, Carlos Ramírez-Herrera, Mario V. Velasco-García e Víctor M. Cetina-Alcalá. "Population structure and spatial distribution of oregano (Lippia graveolensH. B. K.) at the Tehuacán-Cuicatlán Biosphere Reserve, Mexico". Revista Chapingo Serie Ciencias Forestales y del Ambiente 28, n.º 2 (30 de abril de 2022): 289–303. http://dx.doi.org/10.5154/r.rchscfa.2021.04.024.

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Introduction:Oregano (Lippia graveolens H. B. K.) grows in semi-arid ecosystems. There is no information on the population dynamics of this species at the Tehuacán-Cuicatlán Biosphere Reserve (RBTC). Objective: To determine the vertical structure and spatial distribution of L. graveolens in five topographic conditions in the RBTC. Materials and methods: Ten sampling units were established in five topographic conditions (TC), where six plant height categories were defined. Density and structural variables were measured, from which IVI was obtained and population structure curves were constructed. The spatial distribution pattern was analyzed with the Ripley’s transformed function (L(t)). Results and discussion: TC1 showed population curve type IV (low frequency in the first, third and fourth height categories, high in the second and fifth categories, and low in the rest) with lower density (100 plants∙ha-1; 1.6 %) in category 6 (>251 cm), and higher density (1 840 plants∙ha-1;29 %) in category 4 (151 a 200 cm). For TC2 to TC5, the curve was V-type (low frequency in the first category, gradual increase up to the intermediate category, and gradual decrease in the rest) with lower density (20 plants∙ha-1; 0.4 %) in category 6, and higher density (2 320 plants∙ha-1; 51 %) in category 4 which also had the highest IVI (92.8 to 126.1). Spatial distribution was aggregated in TC1 to TC4 and randomized in TC5. Conclusions: Topographic conditions influenced the vertical structure and spatial distribution of oregano.

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Sumithra Ramakrishna, Shivaraja Munikrishnappa e Arul Selvamary Thomaiyar. "The Effect of Linear, Parabolic and Inverted Parabolic Salinity Gradients on The Onset of Darcy Brinkman Rayleigh Benard Two-Component Convection in a Two-Layered System with Dufour Effect". Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 101, n.º 2 (20 de janeiro de 2023): 121–36. http://dx.doi.org/10.37934/arfmts.101.2.121136.

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The physical configuration of the problem of Darcy Brinkman (DB) Rayleigh Benard Two-Component (RBTC) Convection in a two-layered system has been investigated for linear, parabolic and inverted parabolic salinity gradients with the Dufour effect. For the fluid layer, the upper boundary is free with surface tension and for the porous layer, the lower boundary is rigid. At the interface, the normal velocity, normal stress, shear stress, mass, mass flux, heat, and heat flux are continuous. The regular perturbation method is used to solve the resulting ordinary differential equations obtained from normal mode expansion. The effect of different physical parameters on the Rayleigh number versus depth ratio is discussed and results are presented graphically.

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Khan, Sara, Palma Solano-Paez, Jordan R. Hansford, Mei Lu, Salma Al-karmi, Lydia Leung, Ashley Plant-Fox et al. "INNV-43. MORE THAN WHAT MEETS THE EYE: ETMR AN UNDER RECOGNISED ATYPICAL BRAINSTEM PRIMARY. A RARE BRAIN TUMOR CONSORTIUM (RBTC) STUDY". Neuro-Oncology 23, Supplement_6 (2 de novembro de 2021): vi114—vi115. http://dx.doi.org/10.1093/neuonc/noab196.453.

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Abstract 10% of all pediatric brain tumors arise in the brainstem. Amongst these gliomas are the most common while other entities are rare and infrequently described in the literature. In this study we investigated the prevalence of non-gliomatous tumors in the brainstem. Amongst the 1323 embryonal tumours received at the RBTC, we identified 17 cases of ETMRs (17/165) that presented as brainstem primaries. Previously grouped within CNS-PNETs, ETMR, is a new WHO diagnostic entity, characterized by C19MC alterations. ETMR is a disease of infancy, the clinical spectrum of which is poorly understood. ETMRs arise at multiple CNS locations including cerebrum being most common (60%,) followed by cerebellum (18%) and midline structures (6%); notably 10% were brainstem primaries, mimicking DIPG radiologically. All patients presented with a short history of progressive neurological symptoms, with most common signs and symptoms of cranial neuropathies, long tract signs and gait disturbance. Median age at diagnosis was 27 months (range 16-75months) with a male to female ratio of 0.9:1. Predominantly localized (M0-94%, M2-3 -6%) majority of patients underwent upfront biopsy or partial resection (15/17:88%), while complete tumor resection was achieved in 2 cases. All patients received heterogenous combination of chemotherapy with and without radiotherapy. Majority of patients progressed rapidly with median time to progression of 4 months and overall survival of < 13 months. The only long-term surviving patient had complete resection dose intensified chemotherapy and radiation (OS 202months). Primary ETMRs in the brainstem are under recognised entities and carry a dismal prognosis. Although rapidly progressive, prompt recognition, maximal resection and management with multimodal adjuvant therapy should be considered in cases with brainstem disease.

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Adeloye, Adewale O., e Peter A. Ajibade. "Synthesis and Photophysical and Electrochemical Properties of Functionalized Mono-, Bis-, and Trisanthracenyl Bridged Ru(II) Bis(2,2′:6′,2″-terpyridine) Charge Transfer Complexes". Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/570864.

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With the aim of developing new molecular devices having long-range electron transfer in artificial systems and as photosensitizers, a series of homoleptic ruthenium(II) bisterpyridine complexes bearing one to three anthracenyl units sandwiched between terpyridine and 2-methyl-2-butenoic acid group are synthesized and characterized. The complexes formulated as bis-4′-(9-monoanthracenyl-10-(2-methyl-2-butenoic acid) terpyridyl) ruthenium(II) bis(hexafluorophosphate) (RBT1), bis-4′-(9-dianthracenyl-10-(2-methyl-2-butenoic acid) terpyridyl) ruthenium(II) bis(hexafluorophosphate) (RBT2), and bis-4′-(9-trianthracenyl-10-(2-methyl-2-butenoic acid) terpyridyl) ruthenium(II) bis(hexafluorophosphate) (RBT3) were characterized by elemental analysis, FT-IR, UV-Vis, photoluminescence,1H and13C NMR spectroscopy, and electrochemical techniques by elemental analysis, FT-IR, UV-Vis, photoluminescence,1H and13C NMR spectroscopy, and electrochemical techniques. The cyclic voltammograms (CVs) of (RBT1), (RBT2), and (RBT3) display reversible one-electron oxidation processes atE1/2= 1.13 V, 0.71 V, and 0.99 V, respectively (versus Ag/AgCl). Based on a general linear correlation between increase in the length ofπ-conjugation bond and the molar extinction coefficients, the Ru(II) bisterpyridyl complexes show characteristic broad and intense metal-to-ligand charge transfer (MLCT) band absorption transitions between 480–600 nm,ε=9.45×103 M−1 cm−1, and appreciable photoluminescence spanning the visible region.

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Ramírez-Pfeiffer, C., K. Nielsen, P. Smith, F. Marín-Ricalde, C. Rodríguez-Padilla e R. Gomez-Flores. "Application of the Fluorescence Polarization Assay for Detection of Caprine Antibodies to Brucella melitensis in Areas of High Prevalence and Widespread Vaccination". Clinical and Vaccine Immunology 14, n.º 3 (31 de janeiro de 2007): 299–303. http://dx.doi.org/10.1128/cvi.00350-06.

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ABSTRACT The screening Rose Bengal test (RBT), the buffered plate agglutination test (BPAT), and the confirmatory complement fixation test (CFT) are currently approved by the World Organization for Animal Health (OIE) for diagnosis of goat brucellosis. However, RBT (at 3% or 8% cell concentration) is known to be affected by vaccinal antibodies. In the present study, Mexican and Canadian OIE tests were compared with the fluorescence polarization assay (FPA), alone or in combination, using indirect and competitive enzyme-linked immunosorbent assays as classification variables for goat sera obtained from an area of high prevalence and widespread vaccination. The relative sensitivities and specificities were, respectively, 99.7% and 32.5% for RBT3, 92.8% and 68.8% for RBT8, 98.4% and 84.8% for Canadian CFT, 83.7% and 65.5% for Mexican CFT, and 78.1% and 89.3% for FPA. The use of FPA as the confirmatory test in combination with other tests significantly increased the final specificities of the screening tests alone; BPAT, RBT3, and RBT8 plus FPA resulted in final specificities of 90%, 91.2%, and 91.3%, respectively, whereas for the combinations RBT3 plus Mexican CFT, RBT8 plus Mexican CFT, and BPAT plus Canadian CFT, specificities were 65.5%, 63.2%, and 91.7%, respectively. We suggest that FPA may be routinely applied as an adaptable screening test for diagnosis of goat brucellosis and as a confirmatory test for screening test series. Some advantages of FPA are that its cutoff can be adjusted to improve its sensitivity or specificity, it is a low-cost and easy-to-perform test of choice when specificity is relevant or when an alternative confirmatory test is not available, and it is not affected by vaccination, thus reducing the number of misdiagnosed and killed goats.

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Mandujano, Salvador, Ariana Barrera-Salazar e Antonio Vergara-Castrejón. "Similarity in plant species consumed by goat flocks in the tropical dry forest of the Cañada, Oaxaca". Revista Mexicana de Ciencias Pecuarias 10, n.º 2 (17 de junho de 2019): 490–505. http://dx.doi.org/10.22319/rmcp.v10i2.4370.

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El manejo de caprinos (Capra hircus) en sistemas extensivos es una práctica común en la Reserva de la Biosfera Tehuacán-Cuicatlán (RBTC), México. En el presente estudio se analizó la similitud de las especies de plantas consumidas por los caprinos de diferentes rebaños en un paisaje de la Cañada en Oaxaca. Se siguió a ocho rebaños en diferentes localidades durante las épocas de lluvias 2012 y la de seca 2013. Para determinar la similitud espacial y temporal entre los rebaños dependiendo de las plantas consumidas, se emplearon métodos de análisis multivariado, específicamente de agrupamiento jerárquico en el programa R. Los caprinos consumieron 84 especies, de las cuales 30 constituyen el 75 % de la dieta. De acuerdo a los análisis de similitud, Mimosa sp. y Acacia cochiliacantha fueron las especies consumidas con mayor frecuencia por todos los rebaños; mientras que Eleusine indica, Prosopis leavigata y Opuntia sp. fueron las siguientes en importancia. El rebaño de la localidad Tecomovaca fue el menos similar al resto de los rebaños estudiados. Estos resultados contribuyen al entendimiento de los hábitos de forrajeo de los caprinos en región tropical seca, donde la disponibilidad de recursos es marcadamente estacional.

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Mais fontes

Teses / dissertações sobre o assunto "RBTC"

RINALDI, RICCARDO. "An empirical study on the relationship between technological innovation and the task structure of jobs". Doctoral thesis, Università di Siena, 2019. http://hdl.handle.net/11365/1082074.

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The thesis investigates the impact of technological innovation on employment and job characteristics. Automation - the technological driver behind the use of computers and robots - is here understood as a task-selective process of substitution of human input by (digitally enabled) machine input within production and distribution activities. Not only can automation impact on the structure of employment (cancelling the demand of certain jobs) but it can also bear consequences on the organization of work, with the net result of changing the nature of jobs.

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Guo, Yuxia. "User/group administration for RBAC". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape7/PQDD_0001/MQ42067.pdf.

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Khambhammettu, Hemanth. "Enforcing complex policies in RBAC". Thesis, Royal Holloway, University of London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529765.

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Buccelli, Emanuele. "Ingegnerizzazione di RBAC-MAS in TuCSoN". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8462/.

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L'obiettivo della tesi è la creazione di un'infrastruttura di tipo RBAC (Role Based Access Control), adibita al controllo degli accessi all'interno del linguaggio di coordinazione TuCSoN. Il punto di partenza si basa sull'analisi del lavoro sviluppato dall'Ing. Galassi: "Modello di sicurezza e controllo di accesso in una infrastruttura di coordinazione: architettura e implementazione". Usando questa come base teorica di partenza, si sono estrapolati i concetti chiave e si è data vita ad un'implementazione funzionante e di semplice utilizzo di RBAC in TuCSoN.

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Darwish, Wesam M. "Analysis of ANSI RBAC support in commercial middleware". Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/7147.

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This thesis analyzes the access control architectures of three middleware technologies: Common Object Request Broker Architecture (CORBA), Enterprise Java Beans (EJB), and Component Object Model (COM+). For all technologies under study, we formalize the protection state of their corresponding authorization architectures in a more precise and less ambiguous language than their respective specifications. We also suggest algorithms that define the semantics of authorization decisions in CORBA, EJB, and COM+. Using the formalized protection state configurations, we analyze the level of support for the American National Standard Institute's (ANSI) specification of Role-Based Access Control (RBAC) components and functional specification in the studied middleware technologies. This thesis establishes a framework for assessing implementations of ANSI RBAC in the analyzed middleware technologies. Our findings indicate that all of three middleware technologies under study fall short of supporting even Core ANSI RBAC. Custom extensions are necessary in order for implementations compliant with each middleware to support ANSI RBAC required or optional components. Some of the limitations preventing support of ANSI RBAC are due to the middleware's architectural design decisions; however, fundamental limitations exist due to the impracticality of some aspects of the ANSI RBAC standard itself.

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Ma, Mingchao. "Distributed RBAC for subscription-based remote network services". Thesis, University of Greenwich, 2007. http://gala.gre.ac.uk/6232/.

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The problems of identity management inherent in distributed subscription-based resource sharing are investigated in this thesis. The thesis introduces a concept of authentication delegation and distributed RBAC (DRBAC) to support fine granular access control across multiple autonomous resource sites and subscribing sites. The DRBAC model extends the RBAC model to a distributed environment. A prototype system based on the concepts of authentication delegation and distributed role and the distributed RBAC model has been implemented and tested. Access is allowed based on the distributed roles, subject to certain constraints. Enforcing distributed role based access control policies allows organizations to ease the administrative overhead in a distributed environment. This thesis concentrates on both theoretical and practical aspects. It describes the design, implementation and performance of a prototype system that provides controlled access to subscription-based remote network services through a web browser. The prototype system is developed using Java technology and runs on a Tomcat web server. A third-party authentication protocol is designed and employed to exchange security assertions among involved parties. An XML-based policy language has been employed in the system for authorization decision. Public key cryptography and XML security technology are used to ensure the confidentiality and integrity of the system and interaction among the involved parties. The web servers use plug-ins to provide an authentication-delegation service and a policy-based authorization service. Users can use a single userID and password to access multiple subscribed resource sites.

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Báča, Petr. "RBC model - aplikace na ČR". Master's thesis, Vysoká škola ekonomická v Praze, 2009. http://www.nusl.cz/ntk/nusl-76667.

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The diploma thesis deals with the basic Real Business Cycle (RBC) model. RBC theory provides pure supply-side explanation of economic fluctuations. Generaly acknowledged contribution of RBC theory is the fact that the model is developed strictly on microeconomic basis. The thesis consists of two basic parts, theoretical and practical. First, historical background of RBC theory is mentioned. Then the basic RBC model is step-by-step derived and all equations are provided with explanations. In the last theoretical part section RBC theory critisism is discussed. In the practical part the derived basic model is applied to the Czech economy. First certain properties of the Czech business cycles are examined. Then, the basic model is calibrated, simulated and the results are commented.

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Regateiro, Diogo José Domingues. "A secure, distributed and dynamic RBAC for relational applications". Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14045.

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Mestrado em Engenharia de Computadores e Telemática
Nowadays, database application use tools like Java Database Connectivity, Hibernate or ADO.NET to access data stored in databases. These tools are designed to bring together the relational database and object-oriented programming paradigms, forsaking applied access control policies. Hence, the application developers must master the established policies as a means to develop software that is conformant with the established access control policies. Furthermore, there are situations where these policies can evolve dynamically. In these cases it becomes hard to adjust the access control mechanisms. This challenge has led to the development of an extension to the role based access control (RBAC) model where permissions are defined as a sequence of create, read, update and delete (CRUD) expressions that can be executed and the interfaces to access them. From these permissions it's possible to generate security artefacts on the client side, i.e. in a distributed manner, which allows the clients to access the stored data while satisfying the security policies defined. On top of this model extension, a security layer has also been created in order to make the access control secure and obligatory. For the RBAC model extension this work leverages a previous work that created a dynamic access control architecture for relational applications, here referred to as DACA (Dynamic Access Control Architecture). DACA uses business logic information and the defined access control policies to build dynamically the security artefacts for the applications. In situations where the access control policies can evolve dynamically, the security artefacts are adjusted automatically. This base work, however, defines as permissions CRUD expressions, which can be executed in any order, and needs an adequate security layer to authenticate users and protect the system form intruders. Hence, this work aims to create a new architecture, called “S-DRACA” (Secure, Dynamic and Distributed Role-based Access Control Architecture), which extends the work done with DACA so that it is capable of enforcing sequences of CRUD expressions that the applications can execute if the sequences are associated with their roles and the development of a security layer to make it secure. We discuss as well the performance of this system and its applicability to other environments outside of relational databases.
Atualmente, aplicações que acedem a bases de dados utilizam ferramentas como o Java Database Connectivity, Hibernate ou ADO.NET para aceder aos dados nelas armazenados. Estas ferramentas estão desenhadas para unir os paradigmas das bases de dados relacionais e da programação orientada a objetos, mas não estão preocupados com as políticas de controlo de acesso a aplicar. Portanto, os programadores de aplicações têm de dominar as políticas estabelecidas a fim de desenvolver aplicações em conformidade com as políticas de controlo de acesso estabelecidas.. Além disso, existem situações em que as políticas de controlo de acesso podem evoluir dinamicamente. Nestes casos, torna-se difícil adequar os mecanismos de controlo de acesso. Este desafio motivou o desenvolvimento de uma extensão ao modelo de controlo de acesso baseado em papeis (RBAC) que define como permissões sequências de expressões para criar, ler, atualizar e apagar (CRUD) informação e as interfaces de acesso a cada uma delas. A partir destas permissões podem ser gerados artefactos de segurança do lado dos clientes, i.e. de uma forma distribuída, que lhes permitem aceder à informação armazenada na base de dados segundo as políticas definidas. Por cima desta extenção também foi criada uma camada de segurança para tornar o controlo de acesso seguro e obrigatório. Para a extensão do modelo RBAC este trabalho baseou-se num trabalho anterior que criou uma arquitectura dinâmica de controlo de acesso para aplicações de bases de dados relacionais, aqui referida como DACA (Dynamic Access Control Architecture). DACA utiliza informação da lógica de negócio e as políticas de controlo de acesso que foram definidos para criar dinamicamente os artefactos de segurança para as aplicações. Em situações onde as políticas de controle de acesso evoluem de forma dinâmica, os artefactos de segurança são ajustados automaticamente. Este trabalho base, no entanto, define como permissões as expressões CRUD, podendo estas ser executadas em qualquer ordem, e necessita de uma camada de segurança adequada para autenticar utilizadores e proteger os dados sensíveis de intrusos. Portanto, neste trabalho, pretende-se criar uma nova arquitectura, chamada “S-DRACA” (Secure, Dynamic and Distributed Role-based Access Control Architecture), que estende o trabalho feito no âmbito do DACA para que este seja capaz de garantir que sejam cumpridas sequência de expressões CRUD que as aplicações podem executar e que estão associados aos seus papéis nas políticas RBAC e desenvolver uma camada de segurança adequada para a tornar segura. Discutimos, também, o seu desempenho e aplicabilidade em outros ambientes sem ser em bases de dados relacionais.

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Squarcina, Marco <1984&gt. "Granalyze: towards the automatic verification of Grsecurity RBAC policies". Master's Degree Thesis, Università Ca' Foscari Venezia, 2014. http://hdl.handle.net/10579/4729.

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Role-based Access Control (RBAC) is one of the most widespread security mechanisms in use today. Given the growing complexity of policy specifications arising from system administrators' needs, formally verifying that access control systems enforce some defined security invariants is a problem of crucial importance. In a previous work which has been accepted for presentation at IEEE CSF 2012, we developed a framework for the formal verification of Grsecurity RBAC, an access control system developed on top of Unix/Linux systems. In this thesis we improve the framework by considering the interaction with the underlying operating system. This refinement allows for a reduction in the number of transitions within the labelled transition systems resulting from policies. Additionally, we deal with the problem of automatic verification of Grsecurity RBAC policies by defining a set of security invariants. Based on our abstract semantics, we implement Granalyze, a model checker that accounts for the verification of real policies. We report on the results of the experimental analysis conducted using the tool on existing public servers running Grsecurity RBAC.

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Goran, Sladić. "Model kontekstno zavisne kontrole pristupa u poslovnim sistemima". Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2011. http://dx.doi.org/10.2298/NS2011SLADICGORAN.

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Kontrola pristupa odnosno autorizacija, u širem smislu, razmatra na koji način korisnici mogu pristupiti resursima računarskog sistema i na koji način ih koristiti. Ova disertacija se bavi problemima kontrole pristupa u poslovnim sistemima. Tema disertacije je formalna specifkacija modela kontekstno zavisne kontrole pristupa u poslovnim sistemima koji je baziran na RBAC modelu kontrole pristupa. Uvođenjem kontekstno zavisne kontrole pristupa omogućeno je defnisanje složenijih prava pristupa koje u postojećim modelima kontrole pristupa za poslovne sisteme nije bilo moguće realizovati ili bi njihova realizacija bila komplikovana. Dati model primenljiv je u različitim poslovnim sistemima, a podržava defnisanje prava pristupa kako za jednostavne tako i za slo·zene poslovne tokove. Sistem je verifkovan na dva realna poslovna procesa pomoću razvijenog prototipa. Prikazana prototipska implementacija koja ispunjava ciljeve u pogledu funkcionalnosti postavljene pred sistem predstavlja potvrdu praktične vrednosti predloženog modela.
Access control is concerned with the way in which users can access to resources in the computer system. This dissertation focuses on problems of access control for business processes. The subject of the dissertation is a formal specification of the RBAC-based context sensitive access control model for business processes. By using a context-sensitive access control it is possible to define more complex access control policies whose implementation in existing access control models for business processes is not possible or is very complicated. The given model is applicable in diferent business systems, and supports the definition of access control policies for both simple and complex business processes. The model's prototype is verified by two case studies on real business processes. The presented prototype implementation represents a proof of the proposed model's practical value.

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Mais fontes

Livros sobre o assunto "RBTC"

Meroni, Germana, ed. TRIM/RBCC Proteins. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-5398-7.

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Meroni, Germana. TRIM/RBCC proteins. New York, N.Y: Springer Science+Business Media, 2012.

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Corp, INDUS, e United States. Environmental Protection Agency. Control Technology Center, eds. User's manual for the RBLC BBS. Research Triangle Park, N.C: Control Technology Center, U.S. Environmental Protection Agency, 1997.

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Fischer-Hellmann, Klaus-Peter. Information Flow Based Security Control Beyond RBAC. Editado por Rainer Bischoff. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-8348-2618-3.

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Corp, INDUS, Clean Air Technology Center (U.S.) e United States. Environmental Protection Agency. Office of Air Quality Planning and Standards. Information Transfer Group, eds. User's manual for the RBLC data base. Research Triangle Park, N.C: Information Transfer Group, Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, 1998.

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Woodcock, Gordon R. HRST, rocket/RBCC options: A comparative study. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Bailey, Jon S., e Mary R. Burch. The RBT® Ethics Code. New York, NY : Routledge, 2020.: Routledge, 2020. http://dx.doi.org/10.4324/9780367814922.

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Iskandar. Profil 'RBT' pos Keude Peureulak. [Darussalam, Banda Aceh?]: Pusat Penelitian Ilmu Sosial dan Budaya, Universitas Syiah Kuala, 1997.

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T, Chojnacki Kent, e United States. National Aeronautics and Space Administration., eds. Rocket Based Combined Cycle (RBCC) Propulsion Technology Workshop proceedings. Huntsville, Ala: Propulsion Research Center, University of Alabama in Huntsville, 1992.

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Coury, Tarek. Global indeterminacy in locally determinate RBC models. St. Louis, Mo.]: Federal Reserve Bank of St. Louis, 2007.

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Capítulos de livros sobre o assunto "RBTC"

Wang, Lunwei, Lifeng Wei, Xiangke Liao e Huaimin Wang. "AT-RBAC: An Authentication Trustworthiness-Based RBAC Model". In Grid and Cooperative Computing - GCC 2004 Workshops, 343–50. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-30207-0_43.

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Molesini, Ambra, Enrico Denti e Andrea Omicini. "RBAC-MAS and SODA: Experimenting RBAC in AOSE". In Engineering Societies in the Agents World IX, 69–84. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-02562-4_4.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk e I. Savysyuk. "RbTl(SO4)2". In Structure Types. Part 8: Space Groups (156) P3m1 – (148) R-3, 339. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-70892-6_154.

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Oleshchuk, Vladimir. "Trust-Aware RBAC". In Lecture Notes in Computer Science, 97–107. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33704-8_9.

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Zhang, Yue, e James B. D. Joshi. "GEO-RBAC Model". In Encyclopedia of Database Systems, 1–2. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-1-4899-7993-3_1509-2.

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Barker, Steve, Paul Douglas e Terry Fanning. "Implementing RBAC Policies". In Research Directions in Data and Applications Security, 27–36. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-0-387-35697-6_3.

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Zhang, Yue, e James B. D. Joshi. "GEO-RBAC Model". In Encyclopedia of Database Systems, 1244–45. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-39940-9_1509.

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Zhang, Yue, e James B. D. Joshi. "GEO-RBAC Model". In Encyclopedia of Database Systems, 1614–16. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4614-8265-9_1509.

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Chandran, Suroop Mohan, e J. B. D. Joshi. "LoT-RBAC: A Location and Time-Based RBAC Model". In Lecture Notes in Computer Science, 361–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11581062_27.

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Ding, Yi, Jun Jin, Jinglun Zhang, Zhongyi Wu e Kai Hu. "SC-RBAC: A Smart Contract based RBAC Model for DApps". In Human Centered Computing, 75–85. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-37429-7_8.

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Trabalhos de conferências sobre o assunto "RBTC"

Milbocker, Michael T., Gilbert T. Feke, Yakov Reznichenko, Douglas G. Goger e Hironobu Ogasawara. "Real-Time Measurement of the Red Blood Cell Column Width of Retinal Vessels". In Noninvasive Assessment of the Visual System. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/navs.1991.tub1.

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The diameter of the red blood cell column (RBCC) in retinal vessels is a useful measure of retinal vascular response to physiological perturbations and pathological conditions. A modular instrument capable of measuring the RBCC of retinal vessels in realtime can be coupled with simultaneous measurement of mean RBC speed to obtain an instantaneous measure of blood flow. An instrument which provides a real-time and continuous measure of RBC speed such as the stabilized laser Doppler Velocimeter is uniquely suited to this application. In practice the diameter of the RBCC is generally based on a measure of the width of the retinal vessel image on fundus photographs or fluorescein angiograms. An article by Delori et al3 describes and evaluates different methods which have been used to determine the width of the RBCC image.

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Li, He, Weiwei Zhang, Yanhua Li, Chunyong huo, Yaorong Feng e Lingkang Ji. "Comparison of BTC, RBTC and HLP Models in the Calculation of the Dynamic Ductile Fracture Propagation Velocities Based on the X80 Full-Scale Burst Test". In International Conference on Pipelines and Trenchless Technology. Reston, VA: American Society of Civil Engineers, 2013. http://dx.doi.org/10.1061/9780784413142.125.

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Kirkpatrick, Michael S., Maria Luisa Damiani e Elisa Bertino. "Prox-RBAC". In the 19th ACM SIGSPATIAL International Conference. New York, New York, USA: ACM Press, 2011. http://dx.doi.org/10.1145/2093973.2094018.

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Bertino, Elisa, Barbara Catania, Maria Luisa Damiani e Paolo Perlasca. "GEO-RBAC". In the tenth ACM symposium. New York, New York, USA: ACM Press, 2005. http://dx.doi.org/10.1145/1063979.1063985.

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Youman, Charles E. "RBAC transition". In the first ACM Workshop. New York, New York, USA: ACM Press, 1996. http://dx.doi.org/10.1145/270152.270160.

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Kiviharju, Mikko. "RBAC with ABS - Implementation Practicalities for RBAC Integrity Policies". In International Conference on Security and Cryptography. SCITEPRESS - Science and and Technology Publications, 2014. http://dx.doi.org/10.5220/0005122105000509.

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Ferrara, Anna Lisa, Georg Fuchsbauer e Bogdan Warinschi. "Cryptographically Enforced RBAC". In 2013 IEEE 26th Computer Security Foundations Symposium (CSF). IEEE, 2013. http://dx.doi.org/10.1109/csf.2013.15.

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Coyne, Edward J. "Prioritizing RBAC features". In the first ACM Workshop. New York, New York, USA: ACM Press, 1996. http://dx.doi.org/10.1145/270152.270156.

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Sandhu, Ravi. "Issues in RBAC". In the first ACM Workshop. New York, New York, USA: ACM Press, 1996. http://dx.doi.org/10.1145/270152.270162.

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Ouyang, Kai, e James B. D. Joshi. "CT-RBAC: A Temporal RBAC Model with Conditional Periodic Time". In 2007 IEEE International Performance, Computing, and Communications Conference. IEEE, 2007. http://dx.doi.org/10.1109/pccc.2007.358928.

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Relatórios de organizações sobre o assunto "RBTC"

Samios N. P. RBRC Scientific Review Committee Meeting, Volume 101. Office of Scientific and Technical Information (OSTI), janeiro de 2011. http://dx.doi.org/10.2172/1093764.

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Samios, N. P. RBRC Scientific Review Committee Meeting, Volume 97. Office of Scientific and Technical Information (OSTI), novembro de 2009. http://dx.doi.org/10.2172/972031.

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ORGANIZERS: OZAKI, S., e N. P. SAMIOS. PROCEEDINGS OF RIKEN BNL RESEARCH CENTER WORKSHOP: RBRC QCDOC COMPUTER DEDICATION AND SYMPOSIUM ON RBRC QCDOC (VOLUME 74). Office of Scientific and Technical Information (OSTI), julho de 2005. http://dx.doi.org/10.2172/15020005.

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Hull, Julie, e Mark Markham. RBAC Driven Least Privilege Architecture For Control Systems. Office of Scientific and Technical Information (OSTI), janeiro de 2014. http://dx.doi.org/10.2172/1124080.

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En'yo, Hideto, e Taku Izubuchi. RIKEN/RBRC Scientific Review Committee Meeting (Vol. 132). Office of Scientific and Technical Information (OSTI), maio de 2019. http://dx.doi.org/10.2172/1524567.

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Baltz A. RIKEN/RBRC Workshop: future Directions in High Energy QCD. Office of Scientific and Technical Information (OSTI), outubro de 2011. http://dx.doi.org/10.2172/1044786.

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Coury, Tarek, e Yi Wen. Global Indeterminacy in Locally Determinate RBC Models. Federal Reserve Bank of St. Louis, 2007. http://dx.doi.org/10.20955/wp.2007.029.

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Klasky, Hilda B., Sashi Tadinada, Paul T. Williams e Bennett Richard Bass. A Role-Based Access Control (RBAC) Schema for REAP Web App. Office of Scientific and Technical Information (OSTI), setembro de 2013. http://dx.doi.org/10.2172/1093096.

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Prescott, Edward. RBC Methodology and the Development of Aggregate Economic Theory. Cambridge, MA: National Bureau of Economic Research, julho de 2016. http://dx.doi.org/10.3386/w22422.

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Spinella, Philip C. Immune Effects of RBC Storage in Critically Ill Patients. Fort Belvoir, VA: Defense Technical Information Center, dezembro de 2011. http://dx.doi.org/10.21236/ada560489.

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