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| 1 | Towards Cost-Effective Cloud Downloading with Tencent Big Data显示文摘下载计划的云,首先在 2011 由我们求婚了,有效地优化了下载经验的几亿个用户。另外,人们开始在云下载上造许多有用因特网服务。简言之,由使用遮蔽设备下载(并且缓存) 从代表用户,的最好努力的因特网的请求的文件云下载保证数据可获得性并且显著地提高数据交货速度。尽管这个计划似乎简单、直接,设计下载系统的真实世界的云包含复杂、微妙的交易(在推广费用和用户经验之间) 当为很多用户服务时: 1 )怎么计划云缓存能力完成高、买得起的缓存点击比率, 2 )怎么从云加速数据交货到众多的用户, 3 )怎么为高度流行的文件处理笨用户请求,并且 4 )怎么判定云的潜在的下载失败。这份报纸从一个实际观点探讨这些设计交易,基于从下载系统的全国商业的云的大数据,即, Tencent QQXuanfeng。它的跑的踪迹帮助我们发现合理设计策略和参数,并且它的真实表演证实我们的设计的功效。我们的学习为类似、相关的系统的开发者提供稳固的经验和珍贵启发规则。 | 李振华 刘刚 嵇智源 Roger Zimmermann | 2015 | Journal of Computer Science & Technology2015，30，6： | 1 |
| 2 | Relevance ranking in georeferenced video search显示文摘 | Sakire Arslan Ay Roger Zimmermann Seon Ho Kim | 2010 | Multimedia Systems Journal2010，16，2： | 1 |
| 3 | Design and implementation of geo-tagged video search framework显示文摘 | Seon Ho Kim Sakire Arslan AY Roger Zimmermann | 2010 | Journal of Visual Communication and Image Representation2010，，： | 1 |
| 4 | Adaptive low-latency peer-to-peer streaming and its application显示文摘 | Leslie S. Liu Roger Zimmermann | 2006 | Multimedia Systems2006，，6： | 1 |
| 5 | Skyline-join query processing in distributed databases显示文摘 | Mei BAI Junchang XIN Guoren WANG Roger ZIMMERMANN Xite WANG | 2016 | Frontiers of Computer Science2016，10，2： | 1 |
| 6 | Relevance ranking in georeferenced video search 显示文摘 | Sakire Arslan Ay Roger Zimmermann Seon Ho Kim | 2010 | Multimedia Systems Journal2010，16，2： | 1 |
| 7 | Design and implementation of geo-tagged video search framework 显示文摘 | Seon Ho Kim Sakire Arslan Ay Roger Zimmermann | 2010 | Journal of Visual Communication and Image Representation2010，21，8： | 1 |
| 8 | Effcient Location Updates for Continuous Queries over Moving Objects显示文摘The significant overhead related to frequent location updates from moving objects often results in poor performance. As most of the location updates do not affect the query results, the network bandwidth and the battery life of moving objects are wasted. Existing solutions propose lazy updates, but such techniques generally avoid only a small fraction of all unnecessary location updates because of their basic approach (e.g., safe regions, time or distance thresholds). Furthermore, most prior work focuses on a simplified scenario where queries are either static or rarely change their positions. In this study, two novel effcient location update strategies are proposed in a trajectory movement model and an arbitrary movement model, respectively. The first strategy for a trajectory movement environment is the Adaptive Safe Region (ASR) technique that retrieves an adjustable safe region which is continuously reconciled with the surrounding dynamic queries. The communication overhead is reduced in a highly dynamic environment where both queries and data objects change their positions frequently. In addition, we design a framework that supports multiple query types (e.g., range and c-kNN queries). In this framework, our query re-evaluation algorithms take advantage of ASRs and issue location probes only to the affected data objects, without flooding the system with many unnecessary location update requests. The second proposed strategy for an arbitrary movement environment is the Partition-based Lazy Update (PLU, for short) algorithm that elevates this idea further by adopting Location Information Tables (LITs) which (a) allow each moving object to estimate possible query movements and issue a location update only when it may affect any query results and (b) enable smart server probing that results in fewer messages. We first define the data structure of an LIT which is essentially packed with a set of surrounding query locations across the terrain and discuss the mobile-side and server-side processes in correspondence to the utilization of LITs. Simulation results confirm that both the ASR and PLU concepts improve scalability and effciency over existing methods. | 薛幼苓 Roger Zimmermann 顾维信 | 2010 | Journal of Computer Science & Technology2010，25，3： | 0 |
| 9 | A Randomized Controlled Trial of Mindfulness in Recovery from Colorectal Cancer显示文摘Objective:This study examined whether a 4-week group-based mindfulness intervention would be superior in reducing psychological distress in colorectal cancer(CRC)patients compared to a psychoeducation and cognitive behavioural skills learning support active control group.Methods:Patients with CRC were randomized via Computerised Permuted Block Randomisation to mindfulness or active control groups(2-h weekly sessions over 4 weeks).Outcomes were measured pre-intervention,and 8 weeks and 6 months post-baseline.The primary outcome was psychological distress measured by the Hospital Anxiety and Depression Scale.Secondary outcomes were generic quality of life(QoL),disease specific QoL,mindfulness,and intervention credibility and acceptability.Results:Sixty-eight participants were randomized to mindfulness(n=35)or active control group(n=33).Uptake of potentially eligible patients consenting was low(28.0%)and the dropout rate was 33.8%.Depression scores were reduced in both groups at week 8(P=0.020).Control participants had greater improvement in generic mental QoL scores at week 8 than mindfulness(P=0.023).In disease specific QoL,there was reduction in impotence symptom in the mindfulness group(P=0.022)and reduction in faecal incontinence in the control group(P=0.019).The embarrassment symptom had a significantly lower increase in the mindfulness group at week 8 compared to the control group(P=0.009).Both groups rated the treatments as credible and acceptable.Conclusions:Mindfulness was not superior to the active control group in terms of alleviating psychological distress but both treatments were associated with some improvements in depression.There was low uptake of both interventions.(Trial registration number:ACTRN12616001033437) | Andrew McCombie Jennifer Jordan Roger Mulder Kishion Dee Ee Lin Ong Fernanda Fernandez Zimmermann Chris Frampton Frank Frizelle | 2023 | Chinese Journal of Integrative Medicine2023，29，7： | 0 |
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