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Journal articles on the topic 'Datamodell'

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Published: 4 June 2021

Last updated: 10 February 2022

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1

Thi, Vu Duc. "On the Hypergraphs and candidate keys." Journal of Computer Science and Cybernetics 13, no. 4 (April 3, 2016): 98–102. http://dx.doi.org/10.15625/1813-9663/13/4/8038.

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The combinatorial problems are interesting in the relational datamodel. The theory of hypergraphs was a very useful tool for the solution of combinatorial problems. The transversal and the minimal transversal are important concepts in this theory. In this paper, base on hypergraph we give some new characterizations of the set the candidate keys in the relational datamodel.

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2

Thi, Vũ Đức. "Some combinatorial algorithms connecting hypergraphs." Journal of Computer Science and Cybernetics 14, no. 3 (March 23, 2016): 18–22. http://dx.doi.org/10.15625/1813-9663/14/3/7928.

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In the relational datamodel the combinatorial algorithms are constructed many authors. The hypergraph is a important concept in the combinatorial theory. The candidate keys play an essential role in the relational datamodel. In this paper, base on hypergraph we present a new combinatorial algorithm that finds all candidate keys of a give relation. Some another results related to the candidate keys are given.

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3

Thi, Vũ Đức. "On the computational algorithm related to antikeys." Journal of Computer Science and Cybernetics 14, no. 2 (March 15, 2016): 1–7. http://dx.doi.org/10.15625/1813-9663/14/2/7892.

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The keys and antikeys play important roles for the investigation of functional dependency in the relational datamodel. The main purpose of this paper is to prove that the time complexity of finding a set of antileys for a given relation scheme S is exponential in the number of attributes. Some another results connecting the functional dependency are given. Key Word and phrase: Relation, relational datamodel, functionsl dependency, relation scheme, generating Armstrong relation, dependency inference, strong schemen, membership problem, closure, closed set, minimal generater, key, minimal key, antikey.

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4

Vanlande, Renaud, and Christophe Nicolle. "Context DataModel Framework: semantic facilities management." International Journal of Product Lifecycle Management 3, no. 2/3 (2008): 165. http://dx.doi.org/10.1504/ijplm.2008.021440.

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5

Berendsohn, W. G., J. Greilhuber, A. Anagnostopoulos, G. Bedini, J. Jakupovic, P. L. Nimis, and B. Vald�s. "A comprehensive datamodel for karyological databases." Plant Systematics and Evolution 205, no. 1-2 (1997): 85–98. http://dx.doi.org/10.1007/bf00982799.

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6

van den Braak, Susan, and Sunil Choenni. "Voorspellen met big-datamodellen." Justitiële verkenningen 45, no. 4 (November 2019): 21–38. http://dx.doi.org/10.5553/jv/016758502019045004003.

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7

Saunes, Gunnar. "Kun datamodellar, ikkje fakta." Tidsskrift for Den norske legeforening 130, no. 23 (2010): 2340. http://dx.doi.org/10.4045/tidsskr.10.0974.

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8

Chen, Hu, Han Wang, Peijun Lv, Yong Wang, and Yuchun Sun. "Quantitative Evaluation of Tissue Surface Adaption of CAD-Designed and 3D Printed Wax Pattern of Maxillary Complete Denture." BioMed Research International 2015 (2015): 1–5. http://dx.doi.org/10.1155/2015/453968.

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Objective. To quantitatively evaluate the tissue surface adaption of a maxillary complete denture wax pattern produced by CAD and 3DP.Methods. A standard edentulous maxilla plaster cast model was used, for which a wax pattern of complete denture was designed using CAD software developed in our previous study and printed using a 3D wax printer, while another wax pattern was manufactured by the traditional manual method. The cast model and the two wax patterns were scanned in the 3D scanner as “DataModel,” “DataWaxRP,” and “DataWaxManual.” After setting each wax pattern on the plaster cast, the whole model was scanned for registration. After registration, the deviations of tissue surface between “DataModel” and “DataWaxRP” and between “DataModel” and “DataWaxManual” were measured. The data was analyzed by pairedt-test.Results. For both wax patterns produced by the CAD&RP method and the manual method, scanning data of tissue surface and cast surface showed a good fit in the majority. No statistically significant (P>0.05) difference was observed between the CAD&RP method and the manual method.Conclusions. Wax pattern of maxillary complete denture produced by the CAD&3DP method is comparable with traditional manual method in the adaption to the edentulous cast model.

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Chodnicka, Patrycja. "Wpływ ratingów kredytowych państw europejskich na koszt kapitału." Kwartalnik Kolegium Ekonomiczno-Społecznego. Studia i Prace 4, no. 3 (December 13, 2015): 91–102. http://dx.doi.org/10.33119/kkessip.2015.4.3.6.

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The purpose of this paper is to analyze the impact of the countries’ credit ratingson the cost of capital through review of the subject literature and panel datamodels for the 35 European countries for the period 2005–2013.

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10

Thi, Vũ Đức. "On the connections between relations, relation schemes and keys." Journal of Computer Science and Cybernetics 14, no. 4 (March 30, 2016): 60–65. http://dx.doi.org/10.15625/1813-9663/14/4/7974.

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The relation, relation schemes, keys and antikeys are essential concepts in the relational datamodel. In this paper, we present some computational connections between relations, relation schemes and sets of minimal keys. Some another combinatorial results connecting them also are given.

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11

Duc Thy, Vu, and Nguyen Hoang Son. "ON THE DENSE FAMILIES IN THE RELATIONAL DATAMODEL." ASEAN Journal on Science and Technology for Development 22, no. 3 (November 11, 2017): 241. http://dx.doi.org/10.29037/ajstd.162.

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In this paper, dense families of relation schemes are introduced. We characterize minimal keys of relation schemes in terms of dense families. Note that, the dense families of database relations were introduced by Jarvinen [6]. We prove that the set of all minimal keys of a relation scheme s= (U, F) is the transversal hypergraphs of a hypergraph D– {∅}, where Dis any s-dense family. We give a necessary and sufficient condition for an abitrary family to be s-dense family. We also present some dense families of relation schemes. Furthermore, in this paper, we also study antikeys by means of dense families. We present connections between antikeys and a dense family of relation schemes. Finally, we study the time complexity of the problem finding antikeys.

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12

Saltor, F., M. Castellanos, and M. García-Solaco. "Suitability of datamodels as canonical models for federated databases." ACM SIGMOD Record 20, no. 4 (December 1991): 44–48. http://dx.doi.org/10.1145/141356.141377.

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13

Thi, Vũ Đức. "Some results about Hypergraph." Journal of Computer Science and Cybernetics 13, no. 2 (March 30, 2016): 10–17. http://dx.doi.org/10.15625/1813-9663/13/2/7986.

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The goal of this paper is to develop a hypergraph point of view for the investigation of properties of candidate keys in the relational datamodel. We give algorithm that find a minimal transversal and all minimal transversal of a given hypergraph. Some another computational problem related to the hyoergraph, the transversal and the minimal transversal and the minimal transversal also are presented.

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14

Christy, A., and G. MeeraGandhi. "Combining Bitemporal Conceptual Datamodel with Multiway Join Relations for Forecasting." Procedia Computer Science 57 (2015): 1104–14. http://dx.doi.org/10.1016/j.procs.2015.07.396.

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15

K, Madhavi. "Min-Based Symmetry Possibilistic Network Model for Representation of Uncertain Datamodels." International Journal of Computer Science, Engineering and Applications 2, no. 6 (December 31, 2012): 33–42. http://dx.doi.org/10.5121/ijcsea.2012.2604.

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16

van Gasselt, S., and A. Nass. "Planetary mapping—The datamodel's perspective and GIS framework." Planetary and Space Science 59, no. 11-12 (September 2011): 1231–42. http://dx.doi.org/10.1016/j.pss.2010.09.012.

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17

Hribernik, Katarina, and Joerg Prestor. "Attributive datamodel of national hydrogeolocical database to define groundwater bodies of Slovenia." Geologija 47, no. 1 (June 30, 2004): 55–61. http://dx.doi.org/10.5474/geologija.2004.005.

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18

Demetrovics, János, and Vu Duc Thi. "Some results about normal forms for functional dependency in the relational datamodel." Discrete Applied Mathematics 69, no. 1-2 (August 1996): 61–74. http://dx.doi.org/10.1016/0166-218x(95)00076-4.

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19

Demetrovics, Janos, and Vu Duc Thi. "Some problems concerning keys for relation schemes and relations in the relational datamodel." Information Processing Letters 46, no. 4 (June 1993): 179–84. http://dx.doi.org/10.1016/0020-0190(93)90024-4.

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20

Perbawa, Mulki Nurullah, Doan Perdana, and Yoseph Gustommy Bisono. "Performance Analysis of the Differences Restricted Access Window (RAW) on IEEE 802.11ah Standard with Enhanced Distributed Channel Access (EDCA)." JURNAL INFOTEL 10, no. 4 (November 30, 2018): 163. http://dx.doi.org/10.20895/infotel.v10i4.397.

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IEEE 802.11 standard is a WLAN (Wireless LAN) standard that has been used in all over the world. IEEE 802.11ah is the newer technology that designed to supports Internet of Things (IoT) and Machine-to-machine Communication (M2M). IEEE 802.11ah has a feature called Restricted Access Window (RAW) that capable to reduce power usage and have satisfying Quality of Service (QoS). In this research, Enhanced Distributed Channel Access (EDCA) is also applied. Same as RAW, EDCA also be able to affect QoS by modified the MAC Layer in 802.11 standard. This research used 3 different scenarios for RAW parameters: Modifying the number of RAW Group, Modifying the number of RAW Slot, and Comparing 2 Datamode. The EDCA Parameters that used in this research were: Contention Window and Arbitrary inter-frame Spacing Number. The values that expected to be the output in this research are: Delay, Throughput, Packet Delivery Ratio, Availability, and Reliability. After the research has been simulated, the results are: First, the lowest of average delay was Ngroup = 1, the highest of PDR was Ngroup = Nsta/2, and the highest of Throughput was Ngroup = Nsta/2. Second, the lowest of average delay was RAW Slot = 6, the highest of PDR were RAW Slot = 3 and 4, and the highest of Throughput was RAW Slot = 4. Third, the lowest of average delay was Datamode 3,9 Mbps BW 2 MHz, the highest of PDR was Dat mode 3,9 Mbps BW 2 MHz, and the highest of Throughput was Datamode 3,9 Mbps BW 2 MHz. Reliability, Availability, and Energy Consumption also can be affected by modifying RAW parameters, in 802.11ah Energy Consumption can be reduced by increasing the number of RAW Stations and RAW Groups.

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21

Thi, Vu Duc. "Some problems on the functional dependency related to armstrong relations in the relational datamodel." Journal of Computer Science and Cybernetics 14, no. 1 (March 14, 2016): 1–8. http://dx.doi.org/10.15625/1813-9663/14/1/7876.

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22

Demetrovics, J., and V. D. Thi. "Algorithms for Generating an Armstrong Relation and Inferring Functional Dependencies in the Relational Datamodel." Computers & Mathematics with Applications 26, no. 4 (August 1993): 43–55. http://dx.doi.org/10.1016/0898-1221(93)90033-r.

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23

Thi, Vũ Đức. "On the equivalent descriptions of family of functional dependencies in the relational data model." Journal of Computer Science and Cybernetics 11, no. 4 (April 14, 2016): 35–45. http://dx.doi.org/10.15625/1813-9663/11/4/8159.

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The family of functional dependencies (FDs) was introduced by E.F. Codd. Equivalent descriptions of family of FDs play essential rules in the design and implementation of the relation datamodel. It is known [1,3,4,5,7,8,12,13,15] that closure operations, meet-semilattices, families of members which are not intersections of two other members give the equivalent descriptions of family of FDs. i.e. they and family of FDs determine each other uniquely. These equivalent description were successfully applied to find many desirable properties of functional dependency. This paper introduces the concept of maximal family of attributes. We prove that this family is an equivalent description of family of FDs. The concept of nonredundant family of attributes is also introduced in this paper. We present some characterizations and desirable properties of these families.

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24

Guo, Qingchun, Yaonan Zhang, Zhenfang He, and Yufang Min. "Web-Based Data Integration and Interoperability for a Massive Spatial-Temporal Dataset of the Heihe River Basin EScience Framework." Advances in Meteorology 2015 (2015): 1–13. http://dx.doi.org/10.1155/2015/982062.

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To solve the messy problem of data types and form a unified data-processing solution, data in the Heihe River Basin were first classified into five types to integrate them and achieve unified management of data and metadata, preventing the loss of metadata, in the data model of eScience framework. Considering many of the challenges that exist in the construction of the online spatial-temporal data integration and interoperability eScience platform, we used the open data interfaces and standards such as the Common DataModel (CDM) interface, common scientific data modelling (i.e., NetCDF, GRIB, and HDF), and Open Geospatial Consortium (OGC) standards. Through the eScience platform, we also provided online data processing tools by collecting free tools (e.g., NetCDF tool, quality control tool). This eScience platform enables researchers to make full use of scientific research information and results and facilitates collaboration, especially between the GIS community and other members of the earth science community, with the purpose of establishing an online platform of uniform spatial data from the Heihe River Basin via common scientific data modelling.

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25

Reyna Monteverde, Tino Eduardo. "ESTANDARIZACIÓN DEL MODELO DE NEGOCIOS PARA EL MODELADO ESTÁNDAR DE DATOS." Revista Cientifica TECNIA 26, no. 1 (November 29, 2016): 75. http://dx.doi.org/10.21754/tecnia-26012016.08.

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RESUMENEste artículo presenta un nuevo enfoque para determinar El Modelo Funcional de Negocio que se requiere parael modelo de datos del futuro sistema automatizado. El alcance de este nuevo esquema cubre la típica actividadempresarial que requiere de sistemas de información para la toma de decisiones empresariales. Se analizan lospatrones de las áreas funcionales de toda empresa, llegando a presentar los esquemas estándar para cada unade ellas. Estos patrones son demostrados y sustentados debidamente. Los Sistemas Informáticos durante su vidaútil sufren una serie de ajustes vía mantenimiento. Estos cambios generan muchos costos en tiempo y dinero.La estratégia para evitar esta situación es tomar como base un modelo de negocio estándar, el cual pueda serpersonalizado vía parâmetros de acuerdo a los requerimentos particulares del usuário. Con el objetivo de encontrarel Modelo estándar de negocio se demuestra que son cuatro las Macro funciones básicas que de manera universaldeben estar presentes en toda área de Negocios. Estas macro funciones son presentadas y detalladas. Para llegar aeste esquema se demuestra que el servicio entregado por todas las áreas que forman la empresa son Productos tipoServicio y por lo tanto deben cumplir de manera holística con el Ciclo de Vida de Producto (cuatro etapas del Ciclo).Los modelos se presentan tanto de manera gráfica como analítica. En base a este modelo de negocio estándar,se determinarán los requerimientos de información, imprescindibles para la etapa de análisis de los Sistemas deInformación.Palabras clave.- Etapa estudio del sistema, Análisis de sistemas, Requerimientos funcionales, Modelo de negocios, Diagramafuncional.ABSTRACTThis paper presents a new approach for determining the functional business model required for the datamodel of the future automated system. The scope of this new scheme covers the typical business that requiresinformation systems for business decision making. Patterns of functional areas of any enterprise are analyzed,reaching present standard schemes for each. These patterns are displayed and properly supported. InformationSystems for life undergo a series of adjustments via maintenance. These changes generate many costs in timeand money. The strategy to avoid this situation is to build on standard business models, which can be customizedaccording to parameters in particular. In order to find the standard business model there are four basic functionsMacro universally must be present in all areas of business. These macro functions are presented and detailed. Toreach this scheme shows that the service provided by all areas that form the company are type Service Productsand therefore must comply holistically with the product life-cycle management (four stages of the cycle). Themodels are presented both graphically and analytically. They are determined iOn requirements, essential for theanalysis stage of the Information Systems based on this standard model businessKey words.- Stage study system, System analysis, Functional requirements, Business model, Functional diagram.

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26

Reyna Monteverde, Tino Eduardo. "ESTANDARIZACIÓN DEL MODELO DE NEGOCIOS PARA EL MODELADO ESTÁNDAR DE DATOS." Revista Cientifica TECNIA 26, no. 1 (November 29, 2016): 75. http://dx.doi.org/10.21754/tecnia.v26i1.9.

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Este artículo presenta un nuevo enfoque para determinar El Modelo Funcional de Negocio que se requiere parael modelo de datos del futuro sistema automatizado. El alcance de este nuevo esquema cubre la típica actividadempresarial que requiere de sistemas de información para la toma de decisiones empresariales. Se analizan lospatrones de las áreas funcionales de toda empresa, llegando a presentar los esquemas estándar para cada unade ellas. Estos patrones son demostrados y sustentados debidamente. Los Sistemas Informáticos durante su vidaútil sufren una serie de ajustes vía mantenimiento. Estos cambios generan muchos costos en tiempo y dinero.La estratégia para evitar esta situación es tomar como base un modelo de negocio estándar, el cual pueda serpersonalizado vía parâmetros de acuerdo a los requerimentos particulares del usuário. Con el objetivo de encontrarel Modelo estándar de negocio se demuestra que son cuatro las Macro funciones básicas que de manera universaldeben estar presentes en toda área de Negocios. Estas macro funciones son presentadas y detalladas. Para llegar aeste esquema se demuestra que el servicio entregado por todas las áreas que forman la empresa son Productos tipoServicio y por lo tanto deben cumplir de manera holística con el Ciclo de Vida de Producto (cuatro etapas del Ciclo).Los modelos se presentan tanto de manera gráfica como analítica. En base a este modelo de negocio estándar,se determinarán los requerimientos de información, imprescindibles para la etapa de análisis de los Sistemas deInformación.Palabras clave.- Etapa estudio del sistema, Análisis de sistemas, Requerimientos funcionales, Modelo de negocios, Diagramafuncional.ABSTRACTThis paper presents a new approach for determining the functional business model required for the datamodel of the future automated system. The scope of this new scheme covers the typical business that requiresinformation systems for business decision making. Patterns of functional areas of any enterprise are analyzed,reaching present standard schemes for each. These patterns are displayed and properly supported. InformationSystems for life undergo a series of adjustments via maintenance. These changes generate many costs in timeand money. The strategy to avoid this situation is to build on standard business models, which can be customizedaccording to parameters in particular. In order to find the standard business model there are four basic functionsMacro universally must be present in all areas of business. These macro functions are presented and detailed. Toreach this scheme shows that the service provided by all areas that form the company are type Service Productsand therefore must comply holistically with the product life-cycle management (four stages of the cycle). Themodels are presented both graphically and analytically. They are determined iOn requirements, essential for theanalysis stage of the Information Systems based on this standard model business.Keywords.- Stage study system, System analysis, Functional requirements, Business model, Functional diagram.

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27

Thi, Vũ Đức. "Some results about relations in the relational datamodel." Journal of Computer Science and Cybernetics 17, no. 1 (August 1, 2012). http://dx.doi.org/10.15625/1813-9663/17/1/2426.

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28

Vu, Thi Duc, and Son Hoang Nguyen. "On the Dense Families in the Relational Datamodel." ASEAN Journal on Science and Technology for Development 22, no. 3 (July 24, 2007). http://dx.doi.org/10.3125/asean.v22i3.381.

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29

Thi, Vũ Đức. "Some observations on the relation schemes in the relational datamodel." Journal of Computer Science and Cybernetics 17, no. 2 (August 1, 2012). http://dx.doi.org/10.15625/1813-9663/17/2/2444.

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30

., Rahman. "PENERAPAN MODEL TANGKI DENGAN TIGA TANGKI SUSUNAN PARALEL UNTUK TRANSFORMASI DATA HUJAN MENJADI DATA DEBIT (STUDI KASUS PADA INFLOW WADUK SELOREJO DAN WADUK LAHOR)." Jurnal Media Teknik Sipil 9, no. 2 (January 7, 2013). http://dx.doi.org/10.22219/jmts.v9i2.1203.

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An inspiriting factor in making a hydrology model especially rain water transformation datamodel to become debit data is debit accumulation handicap. Sugawara cube model is one of conceptualmodels which has concept rain water stream process become a river stream is analogized as astream through the parallel cube. The approach of cube model can be done in seri, parallel, or themixed.Modeling simulation processes will produce parameters or coefficients of cube model makethe cube model and its parameters can show the condition of river stream area.Three parallel cubes have 14 chosen parameters. The solution is optimizing it to get optimalparameter that can represent a DAS modeled. Algoritma Genetik can be used in the optimizationprocess; it shows the effectiveness and the capacity to determine parameter. The result of theanalysis of 2 DAS shows that the cube model with 3parallel cube represents the correlation ofclimate data and water debit with good process., model gives good trend in fluctuate debit of water.This optimizing technique is covered in Mantlab programming language which is ready to be developedin another DAS.Key word : Hydrology model, 3 Parallel cube model, Parameter, Optimize, Algoritma Genetik

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