Real Time Global Tests of the ALICE High Level Trigger Data Transport Framework

The High Level Trigger (HLT) system of the ALICE experiment is an online event filter and trigger system designed for input bandwidths of up to 25 GB/s at event rates of up to 1 kHz. The system is designed as a scalable PC cluster, implementing several hundred nodes. The transport of data in the system is handled by an object-oriented data flow framework operating on the basis of the publisher-subscriber principle, being designed fully pipelined with lowest processing overhead and communication latency in the cluster. In this paper, we report the latest measurements where this framework has been operated on five different sites over a global north-south link extending more than 10,000 km, processing a ``real-time'' data flow.Comment: 8 pages 4 figure

Upper Atmosphere Research Satellite (UARS) trade analysis

The Upper Atmosphere Research Satellite (UARS) which will collect data pertinent to the Earth's upper atmosphere is described. The collected data will be sent to the central data handling facility (CDHF) via the UARS ground system and the data will be processed and distributed to the remote analysis computer systems (RACS). An overview of the UARS ground system is presented. Three configurations were developed for the CDHF-RACS system. The CDHF configurations are discussed. The IBM CDHF configuration, the UNIVAC CDHF configuration and the vax cluster CDHF configuration are presented. The RACS configurations, the IBM RACS configurations, UNIVAC RACS and VAX RACS are detailed. Due to the large on-line data estimate to approximately 100 GB, a mass storage system is considered essential to the UARS CDHF. Mass storage systems were analyzed and the Braegan ATL, the RCA optical disk, the IBM 3850 and the MASSTOR M860 are discussed. It is determined that the type of mass storage system most suitable to UARS is the automated tape/cartridge device. Two devices of this type, the IBM 3850 and the MASSTOR MSS are analyzed and the applicable tape/cartridge device is incorporated into the three CDHF-RACS configurations

Detecting behavioral conflicts among crosscutting concerns

Aspects have been successfully promoted as a means to improve the modularization of software in the presence of crosscutting concerns. Within the Ideals project, aspects have been shown to be valuable for improving the modularization of idioms (see also Chapter 1). The so-called aspect interference problem is considered to be one of the remaining challenges of aspect-oriented software development: aspects may interfere with the behavior of the base code or other aspects. Especially interference among aspects is difficult to prevent, as this may be caused solely by the composition of aspects that behave correctly in isolation. A typical situation where this may occur is when multiple advices are applied at the same, or shared, join point. In this chapter we explain the problem of behavioral conflicts among aspects at shared join points, illustrated by aspects that represent idioms: Parameter checking and Error propagation. We present an approach for the detection of behavioral conflicts that is based on a novel abstraction model for representing the behavior of advice. The approach employs a set of conflict detection rules which can be used to detect both generic conflicts as well as domain or application specific conflicts. One of the benefits of the approach is that it neither requires the application programmers to deal with the conflict models, nor does it require a background in formal methods for the aspect programmers

Toward Smart Moving Target Defense for Linux Container Resiliency

This paper presents ESCAPE, an informed moving target defense mechanism for cloud containers. ESCAPE models the interaction between attackers and their target containers as a "predator searching for a prey" search game. Live migration of Linux-containers (prey) is used to avoid attacks (predator) and failures. The entire process is guided by a novel host-based behavior-monitoring system that seamlessly monitors containers for indications of intrusions and attacks. To evaluate ESCAPE effectiveness, we simulated the attack avoidance process based on a mathematical model mimicking the prey-vs-predator search game. Simulation results show high container survival probabilities with minimal added overhead.Comment: Published version is available on IEEE Xplore at http://ieeexplore.ieee.org/document/779685

Contours of Inclusion: Frameworks and Tools for Evaluating Arts in Education

This collection of essays explores various arts education-specific evaluation tools, as well as considers Universal Design for Learning (UDL) and the inclusion of people with disabilities in the design of evaluation instruments and strategies. Prominent evaluators Donna M. Mertens, Robert Horowitz, Dennie Palmer Wolf, and Gail Burnaford are contributors to this volume. The appendix includes the AEA Standards for Evaluation. (Contains 10 tables, 2 figures, 30 footnotes, and resources for additional reading.) This is a proceedings document from the 2007 VSA arts Research Symposium that preceded the American Evaluation Association's (AEA) annual meeting in Baltimore, MD

The Professional Artist as Public School Educator: A Research Report of the Chicago Arts Partnerships in Education

Over the past eight years, the Chicago Arts Partnerships in Education (CAPE) has undergone an extensive regimen of program research and evaluation, utilizing both staff members and external consultants to collect, analyze, and interpret information on program effectiveness. This information has been used to shape and strengthen the partnership program each year in response to the needs of students, teachers and teaching artists as well as to changing political and cultural pressures within the Chicago Public School System. In addition,the documentation and publication of insights and lessons learned through arts integration experiences in the schools has contributed significantly to the wider body of research in the field of arts education.During the early years of the program, evaluation efforts focused on general descriptions of the program goals and objectives along with initial impacts on student life.Positive trends were identified in terms of administrative and faculty attitudes and increased involvement in thearts partnerships, due mainly to student interest. More recently, a closer, more detailed analysis of CAPE's growing influence on student learning, teaching practice and school climate has highlighted the value of quality, arts integrated instruction, including evidence of positive effects on standardized math and reading test scores.Last year, our research turned to program sustainability, partly in light of reduced funding, as well as to the assimilation of new partnership schools and an increasing organizational focus on the professional development of participating teachers and artists. In the vast majority of cases, CAPE partnerships have evolved through trials and successes to bring lasting effects on administrators, teachers, and students.Through these studies, it is increasingly apparent that the participation of well-trained teaching artists is a valuable, and in some cases vital, addition to the general education of youth. The presence and artistic know-how brought to the classroom by these talented, dedicated professionals can, and is, having notable, sustainable influence on whole school improvement through transforming the daily learning experiences of educators and students alike. Not only does the presence of a quality arts program enliven a school atmosphere and promote the advancement of artistic skills and aesthetic knowledge, but a closer look at rigorous arts integrated activities in the classroom is revealing important insights into the cognitive benefits of arts education. Not only can artfully constructed lessons that authentically bridge the arts and academic content domains assist in the acquisition of artistic understanding, but they can enhance learning across the academic curriculum and, perhaps more importantly, the underlying thinking curriculu

Avoiding core's DUE & SDC via acoustic wave detectors and tailored error containment and recovery

The trend of downsizing transistors and operating voltage scaling has made the processor chip more sensitive against radiation phenomena making soft errors an important challenge. New reliability techniques for handling soft errors in the logic and memories that allow meeting the desired failures-in-time (FIT) target are key to keep harnessing the benefits of Moore's law. The failure to scale the soft error rate caused by particle strikes, may soon limit the total number of cores that one may have running at the same time. This paper proposes a light-weight and scalable architecture to eliminate silent data corruption errors (SDC) and detected unrecoverable errors (DUE) of a core. The architecture uses acoustic wave detectors for error detection. We propose to recover by confining the errors in the cache hierarchy, allowing us to deal with the relatively long detection latencies. Our results show that the proposed mechanism protects the whole core (logic, latches and memory arrays) incurring performance overhead as low as 0.60%. © 2014 IEEE.Peer ReviewedPostprint (author's final draft