Tomasz Cichowicz's research while affiliated with Poznan University of Technology and other places

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Publications (3)

Fig. 1: Create sequence 
Table 1 : An example table storing events on car failures 
Fig. 2: Create sequence dimension 
Fig. 5: Select sequence 
Fig. 7: Seq-SQL system architecture 
Sequential Data Analytics by Means of Seq-SQL Language
Conference Paper
Full-text available
  • Sep 2015
Ubiquitous devices and applications generate data, whose natural feature is order. Most of the commercial software and research prototypes for data analytics allow to analyze set oriented data, neglecting their order. However, by analyzing both data and their order dependencies, one can discover new business knowledge. Few solutions in this field h...
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Hyper-heuristics for cross-domain search
Article
  • Dec 2012
In this paper we present two hyper-heuristics developed for the Cross-Domain Heuristic Search Challenge. Hyper-heuristics solve hard combinatorial problems by guiding low level heuristics, rather than by manipulating problem solutions directly. Two hyper-heuristics are presented: Five Phase Approach and Genetic Hive. Development paths of the algori...
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Five Phase and Genetic Hive Hyper-Heuristics for the Cross-Domain Search
Conference Paper
  • Jan 2012
In this paper we present two hyper-heuristics: Five Phase Approach (5Ph) and Genetic Hive (GH), developed for the Cross-Domain Heuristic Search Challenge held in 2011. Performance of both methods is studied. Experience gained in construction of the hyper-heuristics is presented. Conclusions and recommendations for the future advancement of hyper-he...
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Citations

... Though this approach supports both time points and time periods, the period data is limited to sequences of non-overlapping periods that are derived from point events, such as the time periods between two consecutive sensor measurements (e.g., all light and temperature sensor data are stored in one fact table as a sequence of events). Bebel et al. (2015) focus on a proof of concept implementation of the Seq-SQL language. The study is targeted to analyze time point-based sequential data in an OLAP-like manner followed by an empirical evaluation of queries. ...
Reference: Modeling and querying facts with period timestamps in data warehouses
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... At each stage, the best first search can use hyper-heuristic for the domain search. The use of some low-level heuristics makes search performance better [19]. Efficiency and optimization need to be done from design to implementation and need to be compared with other algorithms [20]. ...
Reference: Two Stages Best First Search Algorithm Using Hard and Soft Constraints Heuristic for Course Timetabling
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