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1.
Hui Ma Klaus-Dieter Schewe Bernhard Thalheim Qing Wang 《Service Oriented Computing and Applications》2012,6(3):189-205
Large-scale service-oriented computing is based on the idea that services from various servers are combined into one distributed application. Referring to a collection of services on one server as a ??service cloud??, the problem investigated in this paper is to define formal high-level specifications of such distributed applications and to enable the location of suitable services for them. Based on the language-independent model of Abstract State Services (AS2s), which serves as a universal integrated model for data and software as services, we extend AS2s by high-level action schemes called ??plots?? as a means to specify permitted sequences of service operations. On these grounds, we develop a model for service mediators, that is, specifications of composed services in which service slots have to be filled by actual services, and investigate matching conditions for slots of mediators and services. For a services to match a slot in a mediator, a (generalised) projection of the mediator must comply with the plot of the service. Furthermore, the service must be semantically adequate, which requires the use of a service ontology. 相似文献
2.
Boniol Frédéric Wiels Virginie Aït-Ameur Yamine Schewe Klaus-Dieter 《International Journal on Software Tools for Technology Transfer (STTT)》2017,19(2):133-140
International Journal on Software Tools for Technology Transfer - 相似文献
3.
This paper focuses on extensions of Abstract State Machines (ASMs) for the benefit of a refinement calculus in the area of
data-intensive applications, in particular data warehouses and on-line analytical processing. The extensions lead to a typed
version of ASMs and a more specific notion of strong data refinement, which incorporates the preservation of information content
by means of schema dominance. Each typed ASM can be effectively translated into an equivalent ordinary one. Providing typed
ASMs helps to exploit the existing logical formalisms used in data-intensive applications to define a ground model. Furthermore,
strong data refinement helps to set up a refinement-based development method that uses provably correct standard refinement
rules. 相似文献
4.
We investigate functional dependencies in databases that support complex values such as records, lists, sets and multisets. Therefore, an abstract algebraic framework is proposed that classifies data models according to the underlying types they support. This allows to emphasise the impact of the data types rather than the specifics of a particular data model. 相似文献
5.
A room-based diagnostic x-ray imaging system for routine measurement of radiotherapy patient orientation has been developed. The system consists of a pair of room-mounted x-ray tubes and a portable imager consisting of an orthogonal pair of phosphor screens, a mirror/lens system, a CCD camera, and computer software for comparing images of the patient to reference images. Orthogonal pairs of images can be acquired quickly and with relatively little exposure, allowing correction of patient setup on a daily basis. This could limit patient setup error to the uncertainty in the measurement and repositioning processes, a potentially significant improvement over the present standard. 相似文献
6.
The promise of management information systems has not yet been realized; low utilization rates by line decision-makers may be one cause. This paper suggests that the effort of marketing the MIS is as important as the work of both the MIS design and implementation phases combined. Various MIS “markets” are segmented, and marketing mix strategies which could encourage greater MIS usage are developed. An application of these marketing strategies for an advanced MIS is provided as an illustration. 相似文献
7.
R. Moore-Foster B. Norby R.L. Schewe R. Thomson P.C. Bartlett R.J. Erskine 《Journal of dairy science》2019,102(1):696-705
The objective of this study was to determine which herd-level variables were associated with delayed milk ejection (bimodal milk let-down) in 64 Michigan dairy herds. Median herd size was 294 cows (range 59 to 2,771 cows). For each herd, milking protocols were observed and milk flow dynamics were estimated by use of digital vacuum recorders. Surveys were also administered to the producers to measure mastitis management practices and attitudes. Milk flow dynamics were recorded for a total of 3,824 cow milkings, with a mean of 60 milkings per herd (range of 11 to 154). Backward multivariable analysis was used to determine which of the 47 herd-level milking and management variables were associated with delayed milk ejection (cows with milk let-down periods between milking cluster attachment and the incline phase of milk flow of >30 s). Delayed milk ejection occurred in an average of 25% of the cows in each herd (range 0 to 75%). A multivariable model found that the proportion of cows in a herd with delayed milk ejection was negatively associated with mean total time of tactile stimulation during premilking routines and positively associated with herd size. 相似文献
8.
Dr. Laura Drummond Parab J. Haque Dr. Binbin Gu Julia S. Jung Dr. Hendrik Schewe Prof. Dr. Jeroen S. Dickschat Dr. Markus Buchhaupt 《Chembiochem : a European journal of chemical biology》2022,23(14):e202200091
The natural substance class of terpenoids covers an extremely wide range of different structures, although their building block repertoire is limited to the C5 compounds DMAPP and IPP. This study aims at the characterization of methyltransferases (MTases) that modify these terpene precursors and the demonstration of their suitability for biotechnological purposes. All seven enzymes tested accepted IPP as substrate and altogether five C6 compounds and six C7 compounds were formed within the reactions. A high selectivity for the deprotonation site as well as high stereoselectivity could be observed for most of the biocatalysts. Only the enzyme from Micromonospora humi also accepted DMAPP as substrate, converting it into (2R)-2-methyl-IPP in vitro. In vivo studies demonstrated the production of a C8 compound and a hydride shift step within the MTase-catalyzed reaction. Our study presents IPP/DMAPP MTases with very different catalytic properties, which provide biosynthetic access to many novel terpene-derived structures. 相似文献
9.
R. Moore-Foster B. Norby R.L. Schewe R. Thomson P.C. Bartlett R.J. Erskine 《Journal of dairy science》2019,102(3):2544-2550
The objective of this study was to determine the herd-level variables that were associated with total stimulation time during the premilking routine in 64 Michigan dairy herds. The mean herd size was 452 cows (range = 59 to 2,771 cows). For each herd, surveys were administered to producers to gather mastitis management practices and attitudes. Additionally, milking protocols were observed and milk flow dynamics were measured by use of digital vacuum recorders. Backward multivariate regression analysis was used to determine which of 47 herd-level milking and management variables were associated with mean total stimulation time. Mean total stimulation time was 14.2 s (range = 2.4–40.8 s) and was positively associated with increasing latency period (time interval between first stimulation and cluster attachment). Total stimulation time was negatively associated with greater herd size and number of visits to each cow in the premilking routine. In summary, increased stimulation time is more likely in herds that foster a lower sense of urgency of cow throughput during milking, as evidenced by a positive association with longer latency periods and fewer preparation visits per cow. Tactile stimulation is critical for efficient milk ejection; if inadequate, cows are at greater risk of delayed milk ejection and bimodal milk flow, which in turn has been associated with teat congestion and reduced milk flow. This study offers insight as to some of the herd factors that may be limiting adequate tactile stimulation. 相似文献
10.