One key to improving high-performance computing (HPC) productivity is finding better ways to measure it. We define productivity in terms of mission goals, i.e., greater productivity means that more science is accomplished with less cost and effort. Traditional software productivity metrics and computing benchmarks have proven inadequate for assessing or predicting such end-to-end productivity. ...

One key to improving high-performance computing (HPC) productivity is finding better ways to measure it. We define productivity in terms of mission goals, i.e., greater productivity means that more science is accomplished with less cost and effort. Traditional software productivity metrics and computing benchmarks have proven inadequate for assessing or predicting such end-to-end productivity. ...

Wireless body sensor network systems (WB-SNSs) can use diverse radio modules. However, previous studies did not consider different characteristics of radio modules, which deeply impact the performance of WBSNSs. In this paper, we analyze the performance of WB-SNSs using the representative radio modules CC2420 and CC1000. In this environment, we collected log data from real sensor devices deploy...

BACKGROUND Employees with physically heavy work have an increased risk of musculoskeletal disorders leading to reduced work ability. AIMS To investigate if a high level of musculoskeletal pain or pain-related fear of movement was associated with low productivity among employees with physically heavy work and differing work ability levels. METHODS The study was conducted at a Danish producti...

We address the dynamic scheduling problem for discrete-state restless bandits, where sequence-independent setup penalties (costs or delays) are incurred when starting work on a project. We reformulate such problems as restless bandit problems without setup penalties, and then deploy the theory of marginal productivity indices (MPIs) and partial conservation laws (PCLs) we have introduced and de...

あらまし 筆者らはこれまで,強制的に受信電力ゆらぎを与えるランダム送信電力制御(TPC)を Rake 合成を用い る直接拡散符号分割多重(DS-CDMA)無線パケットアクセスに適用すればキャプチャ効果によりリンク容量を増大 できること,ランダム TPC にパス間干渉(IPI)キャンセルを組み合わせればスループットを更に向上できること,を 明らかにしてきた.最近,IPI を大幅に抑圧する技術として周波数領域等化(FDE)が注目されている.そこで本論文 では,FDE とランダム TPC を併用する DS-CDMA 無線パケットアクセスの受信信号電力対雑音+干渉電力比(SINR) の数式表現を導出し,それを用いてシステムスループットを数値計算により求めている.さらに,Rake 合成を適用 したときと FDE を適用したときのシステムスループットを比較し,FDE による IPI の抑圧効果を...

Small Materialized Aggregates (SMAs for short) are considered a highly flexible and versatile alternative for materialized data cubes. The basic idea is to compute many aggregate values for small to medium-sized buckets of tuples. These aggregates are then used to speed up query processing. We present the general idea and present an application of SMAs to the TPC-D benchmark. We show that explo...

Studies for the TESLA TPC (Time Projection Chamber) with GEM (Gas Electron Multiplier) readout at DESY/Hamburg University are presented. Two test chamber setups are being operated. The studies include basic GEM performance, tracking and the determination of the resolution using different pad sizes and geometries. Our measurements show that chevron shaped pads lead to a better point resolution c...

The HIPERLAN type 2 (HIgh PERformance Radio Local Area Network) standard provides means for link adaptation (LA) and transmit power control (TPC). Both mechanisms are not independent in a cellular network environment. This paper analyses the basic requirements for joint LA and TPC and proposes a suitable algorithm which is based on the empty part in MAC frames. The implementation in a simulator...

To generate big responses of unemployment to productivity shocks in a business cycle context or to productivity changes in a welfare state context, researchers have reconfigured matching models in various ways, e.g., by elevating the utility of leisure, by making wages sticky, by assuming alternating-offer wage bargaining, by introducing fixed matching costs, and the costly acquisition of credi...