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Auflistung nach Autor:in "Sengstock, Christian"

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  • Konferenzbeitrag
    Online hot spot prediction in road networks
    (Datenbanksysteme für Business, Technologie und Web (BTW), 2011) Häsner, Maik; Junghans, Conny; Sengstock, Christian; Gertz, Michael
    Advancements in GPS-technology have spurred major research and development activities for managing and analyzing large amounts of position data of mobile objects. Data mining tasks such as the discovery of movement patterns, classification and outlier detection in the context of object trajectories, and the prediction of future movement patterns have become basic tools in extracting useful information from such position data. Especially the prediction of future movement patterns of vehicles, based on historical or recent position data, plays an important role in traffic management and planning. In this paper, we present a new approach for the online prediction of so-called hot spots, that is, components of a road network such as intersections that are likely to experience heavy traffic in the near future. For this, we employ an efficient path prediction model for vehicle movements that only utilizes a few recent position data. Using an aggregation model for hot spots, we show how regional information can be derived and connected substructures in a road network can be determined. Utilizing the behavior of such hot spot regions over time in terms of movement or growth, we introduce different types of hot spots and show how they can be determined online. We demonstrate the effectiveness of our approach using a real large-scale road network and different traffic simulation scenarios.
  • Konferenzbeitrag
    SAP HANA Vora: A Distributed Computing Platform for Enterprise Data Lakes
    (Datenbanksysteme für Business, Technologie und Web (BTW 2017), 2017) Sengstock, Christian; Mathis, Christian
    Businesses are increasingly leveraging the power of Big Data to improve their services and products. We call the infrastructure to process and manage the heterogenous kinds of data their “data lakes”. Data lakes are used to store and process massive streams of sensor data, service data, collected or generated media, archived enterprise data, and massive transactional databases, among others. Such infrastructures are often realized by Hadoop clusters and low-cost persistence layers, such as S3 or SWIFT data stores. SAP HANA Vora is a distributed computing platform that sits on top of Data Lakes and was developed to build a basis layer for upcoming Big Data applications in the enterprise. It provides high-performance in-memory data processing and management capabilities, is easily extensible by new computing engines, extends the existing Big Data software stack, and integrates with the existing enterprise IT by design. We present an architectural overview of the system.