Creep crack-growth: A new path-independent T sub o and computational studies

Two path independent integral parameters which show some degree of promise as fracture criteria are the C* and delta T sub c integrals. The mathematical aspects of these parameters are reviewed. This is accomplished by deriving generalized vector forms of the parameters using conservation laws which are valid for arbitrary, three dimensional, cracked bodies with crack surface tractions (or applied displacements), body forces, inertial effects and large deformations. Two principal conclusions are that delta T sub c is a valid crack tip parameter during nonsteady as well as steady state creep and that delta T sub c has an energy rate interpretation whereas C* does not. An efficient, small displacement, infinitestimal strain, displacement based finite element model is developed for general elastic/plastic material behavior. For the numerical studies, this model is specialized to two dimensional plane stress and plane strain and to power law creep constitutive relations

CROSS-DB: a feature-extended multidimensional data model for statistical and scientific databases

Statistical and scientific computing applications exhibit characteristics that are fundamentally different from classical database system application domains. The CROSS-DB data model presented in this paper is optimized for use in such applications by providing advanced data modelling methods and application-oriented query facilities, thus providing a framework for optimized data management procedures. CROSS-DB (which stands for Classification-oriented, Redundancy-based Optimization of Statistical and Scientific DataBases) is based on a multidimensional data view. The model differs from other approaches by o~ering two complementary rnechanisrnsfor structuring qualifying information, classification and feature description. Using these mechanisms results in a normalized, low-dimensional database schema which ensures both, modelling uniqueness and understandability while providing enhanced modelling flexibility

Energy: A continuing bibliography with indexes, issue 34

This bibliography lists 1015 reports, articles, and other documents introduced into the NASA scientific and technical information system from April 1, 1981 through June 30, 1981

Magnetic Suspension and Balance Systems: A Comprehensive, Annotated Bibliography

This bibliography contains 301 entries. Results are reported of recent studies aimed at increasing the research capabilities of magnetic suspension and balance systems; e.g., increasing force and torque capability, increasing angle of attack capability, and increasing overall system reliability. The problem is addressed of scaling from the relatively small size of existing systems to much larger sizes. The purpose of the bibliography is to provide an up-to-date list of publications that might be helpful to persons interested in magnetic suspension and balance systems for use in wind tunnels. The arrangement is generally chronological by date of presentation. However, papers presented at conferences or meetings are placed under dates of presentation. The numbers assigned to many of the citations have been changed from those used in the previous bibliography. This has been done in order to allow outdated citations to be removed and some recently discovered older works to be included in their proper chronological order. Author, source, and subject indexes are included in order to increase the usefulness of this compilation

Scalable Uncertainty-tolerant Business Rules

The final publication is available at Springer via http://dx.doi.org/10.1007/978-3-319-07617-1_16Business rules are of key importance for maintaining the correctness of business processes and the reliability of business data. When they take the form of integrity constraints, business rules also can help to contain the amount of uncertainty associated to business data and decisions based on those data. However, business rule enforcement may not scale up easily to systems with concurrent transactions. To a large extent, the problem is due to two common exigencies: the postulates of total and of isolated business rule satisfaction. In order to limit the accumulation of business rule violations, and thus of uncertainty, we are going to outline how a measure-based uncertainty-tolerant approach to business rules maintenance scales up to concurrent transactions. The scale-up is achieved by refraining from the postulates of total and isolated business rule satisfaction.Supported by ERDF/FEDER and the MEC grant TIN2012-37719-C03-01.Cuzzocrea, A.; Decker, H.; Muñoz-Escoí, FD. (2014). Scalable Uncertainty-tolerant Business Rules. En Hybrid Artificial Intelligence Systems: 9th International Conference, HAIS 2014, Salamanca, Spain, June 11-13, 2014. Proceedings. Springer Verlag (Germany). 179-190. https://doi.org/10.1007/978-3-319-07617-1_16S179190Abiteboul, S., Hull, R., Vianu, V.: Foundations of Databases. Addison-Wesley (1995)Abraham, A.: Hybrid approaches for approximate reasoning. Journal of Intelligent and Fuzzy Systems 23(2-3), 41–42 (2012)Bayer, R.: Integrity, concurrency, and recovery in databases. In: Samelson, K. (ed.) ECI 1976. LNCS, vol. 44, pp. 79–106. Springer, Heidelberg (1976)Berenson, H., Bernstein, P.A., Gray, J., Melton, J., O’Neil, E.J., O’Neil, P.E.: A critique of ansi sql isolation levels. In: SIGMOD Conference, pp. 1–10 (1995)Bernstein, P.A., Hadzilacos, V., Goodman, N.: Concurrency Control and Recovery in Database Systems. Addison-Wesley (1987)Cuzzocrea, A.: Optimization issues of querying and evolving sensor and stream databases. Information Systems 39, 196–198 (2014)Cuzzocrea, A., Leung, C.K.-S., Tanbeer, S.K.: Mining of Diverse Social Entities from Linked Data. In: Selçuk Candan, K., Amer-Yahia, S., Schweikardt, N., Christophides, V., Leroy, V. (eds.) Proc. Workshops of the EDBT/ICDT 2014 Joint Conference. CEUR Workshop Proceedings, pp. 269–274 (2014)Cuzzocrea, A., de Juan Marín, R., Decker, H., Muñoz-Escoí, F.D.: Managing uncertainty in databases and scaling it up to concurrent transactions. In: Hüllermeier, E., Link, S., Fober, T., Seeger, B. (eds.) SUM 2012. LNCS, vol. 7520, pp. 30–43. Springer, Heidelberg (2012)Date, C.J.: What not how: the business rules approach to application development. Addison-Wesley Longman Publishing Co., Inc., Boston (2000)Decan, A., Pijcke, F., Wijsen, J.: Certain conjunctive query answering in SQL. In: Hüllermeier, E., Link, S., Fober, T., Seeger, B. (eds.) SUM 2012. LNCS, vol. 7520, pp. 154–167. Springer, Heidelberg (2012)Decker, H.: Causes for inconsistency-tolerant schema update management. In: ICDE Workshops, pp. 157–161 (2011)Decker, H.: Causes of the violation of integrity constraints for supporting the quality of databases. In: Murgante, B., Gervasi, O., Iglesias, A., Taniar, D., Apduhan, B.O. (eds.) ICCSA 2011, Part V. LNCS, vol. 6786, pp. 283–292. Springer, Heidelberg (2011)Decker, H.: Partial repairs that tolerate inconsistency. In: Eder, J., Bielikova, M., Tjoa, A.M. (eds.) ADBIS 2011. LNCS, vol. 6909, pp. 389–400. Springer, Heidelberg (2011)Decker, H.: Answers that have quality. In: Murgante, B., Misra, S., Carlini, M., Torre, C.M., Nguyen, H.-Q., Taniar, D., Apduhan, B.O., Gervasi, O. (eds.) ICCSA 2013, Part II. LNCS, vol. 7972, pp. 543–558. Springer, Heidelberg (2013)Decker, H., Martinenghi, D.: Inconsistency-tolerant integrity checking. IEEE Trans. Knowl. Data Eng. 23(2), 218–234 (2011)Decker, H., Muñoz-Escoí, F.D.: Revisiting and improving a result on integrity preservation by concurrent transactions. In: Meersman, R., Dillon, T., Herrero, P. (eds.) OTM 2010. LNCS, vol. 6428, pp. 297–306. Springer, Heidelberg (2010)Eswaran, K.P., Chamberlin, D.D.: Functional specifications of subsystem for database integrity. In: Kerr, D.S. (ed.) Proceedings of the International Conference on Very Large Data Bases, Framingham, Massachusetts, USA, September 22-24, pp. 48–68. ACM (1975)Eswaran, K.P., Gray, J., Lorie, R.A., Traiger, I.L.: The notions of consistency and predicate locks in a database system. Commun. ACM 19(11), 624–633 (1976)Gardarin, G.: Integrity, consistency, concurrency, reliability in distributed database management systems. In: Distributed Databases, pp. 335–351 (1980)Gilbert, S., Lynch, N.A.: Brewer’s conjecture and the feasibility of consistent, available, partition-tolerant web services. SIGACT News 33(2), 51–59 (2002)Gray, J., Lorie, R., Putzolu, G.: Granularity of locks in a shared data base. In: 1st International Conference on Very Large Data Bases, pp. 428–451. ACM Press (1975)Grefen, P.W.P.J.: Combining theory and practice in integrity control: A declarative approach to the specification of a transaction modification subsystem. In: Agrawal, R., Baker, S., Bell, D.A. (eds.) 19th International Conference on Very Large Data Bases, Dublin, Ireland, August 24-27, pp. 581–591. Morgan Kaufmann (1993)Hammer, M., McLeod, D.: Semantic integrity in a relational data base system. In: 1st International Conference on Very Large Data Bases, pp. 25–47. ACM Press (1975)Ibrahim, H.: Checking integrity constraints - how it differs in centralized, distributed and parallel databases. In: DEXA Workshops, pp. 563–568 (2006)Lynch, N.A., Blaustein, B.T., Siegel, M.: Correctness conditions for highly available replicated databases. In: PODC, pp. 11–28 (1986)Martinenghi, D., Christiansen, H., Decker, H.: Integrity checking and maintenance in relational and deductive databases and beyond. In: Ma, Z. (ed.) Intelligent Databases: Technologies and Applications, pp. 238–285. Idea Group Publishing (2006)Morgan, T.: Business Rules and Information Systems: Aligning IT with Business Goals (Unisys Series). Addison-Wesley Professional (2002)Muñoz-Escoí, F.D., Ruiz-Fuertes, M.I., Decker, H., Armendáriz-Íñigo, J.E., de Mendívil, J.R.G.: Extending middleware protocols for database replication with integrity support. In: Meersman, R., Tari, Z. (eds.) OTM 2008, Part I. LNCS, vol. 5331, pp. 607–624. Springer, Heidelberg (2008)Nicolas, J.-M.: Logic for improving integrity checking in relational data bases. Acta Informatica (18), 227–253 (1982)Pipino, L., Lee, Y., Yang, R.: Data quality assessment. Commun. ACM 45(4), 211–218 (2002)Ross, R.G.: Business Rule Concepts: Getting to the Point of Knowledge, 2nd edn. (1998)Stonebraker, M.: Technical perspective - one size fits all: an idea whose time has come and gone. Commun. ACM 51(12), 76 (2008)Stonebraker, M.: Errors in Database Systems, Eventual Consistency, and the CAP Theorem (2010)Stonebraker, M.: In search of database consistency. Commun. ACM 53(10), 8–9 (2010)Vidyasankar, K.: Serializability. In: Encyclopedia of Database Systems, pp. 2626–2632 (2009)Vogels, W.: Eventually consistent. Commun. ACM 52(1), 40–44 (2009)Weikum, G.: Where’s the Data in the Big Data Wave? ACM SIGMOD Blog (2013), http://wp.sigmod.org/?p=786Weikum, G., Vossen, G.: Transactional Information Systems: Theory, Algorithms, and the Practice of Concurrency Control and Recovery. Morgan Kaufmann (2002)Ziwich, R.P., Duarte Jr., E.P., Albini, L.C.P.: Distributed integrity checking for systems with replicated data. In: ICPADS (1), pp. 363–369 (2005

Compensation-aware runtime monitoring

To avoid large overheads induced by runtime monitoring, the use of asynchronous log-based monitoring is sometimes adopted — even though this implies that the system may proceed further despite having reached an anomalous state. Any actions performed by the system after the error occurring are undesirable, since for instance, an unchecked malicious user may perform unauthorized actions. Since stopping such actions is not feasible, in this paper we investigate the use of compensations to enable the undoing of actions, thus enriching asynchronous monitoring with the ability to restore the system to the original state in which the anomaly occurred. Furthermore, we show how allowing the monitor to adaptively synchronise and desynchronise with the system is also possible and report on the use of the approach on an industrial case study of a financial transaction system.peer-reviewe

Interim research assessment 2003-2005 - Computer Science

This report primarily serves as a source of information for the 2007 Interim Research Assessment Committee for Computer Science at the three technical universities in the Netherlands. The report also provides information for others interested in our research activities