Optimal response time retrieval of replicated data (extended abstract)

Author(s):  
Ling Tony Chen ◽  
Doron Rotem
Author(s):  
Lars Frank

The most important evaluation criteria for replication methods are availability, performance, consistency, and costs. Performance and response time may be improved by substituting remote data accesses with local data accesses to replicated data. The availability of the system can be increased by using replicated data in case a local failure or disaster should occur. The major disadvantages of data replication are the additional costs of updating replicated data and the problems related to managing the consistency of the replicated data. Tables 1 and 2 give an overview of the evaluation of the replication methods described in this article. Frank (1999) described how such replication overviews may be used to optimize databases in practice. This article evaluates many more replication methods and therefore, it is possible to optimize even more. However, the evaluation criteria previously described have to be subdivided to illustrate the different properties of the different replication methods.


1995 ◽  
Vol 05 (03) ◽  
pp. 451-460
Author(s):  
I. W. CHAN ◽  
F. CHOI

We present a simple systolic algorithm for implementing dictionary machine based on the VLSI technology. Our design makes use of a dynamic. global tree rebalancing scheme to attain high system throughput. Our scheme is simple to implement and requires low sophistication in the design of processing nodes. Results from analysis and simulation show that our algorithm has optimal response time and achieves an average latency close to 1. This represents a significant improvement over many of the previous designs. Unlike most parallel dictionary machines reported in the literature, our approach requires no compression operations.


2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Ling Hsuan Huang ◽  
Yu-Ni Ho ◽  
Ming-Ta Tsai ◽  
Wei-Ting Wu ◽  
Fu-Jen Cheng

Ambulance response time is a prognostic factor for out-of-hospital cardiac arrest (OHCA), but the impact of ambulance response time under different situations remains unclear. We evaluated the threshold of ambulance response time for predicting survival to hospital discharge for patients with OHCA. A retrospective observational analysis was conducted using the emergency medical service (EMS) database (January 2015 to December 2019). Prehospital factors, underlying diseases, and OHCA outcomes were assessed. Receiver operating characteristic (ROC) curve analysis with Youden Index was performed to calculate optimal cut-off values for ambulance response time that predicted survival to hospital discharge. In all, 6742 cases of adult OHCA were analyzed. After adjustment for confounding factors, age (odds ratio [OR] = 0.983, 95% confidence interval [CI]: 0.975–0.992, p < 0.001 ), witness (OR = 3.022, 95% CI: 2.014–4.534, p < 0.001 ), public location (OR = 2.797, 95% CI: 2.062–3.793, p < 0.001 ), bystander cardiopulmonary resuscitation (CPR, OR = 1.363, 95% CI: 1.009–1.841, p = 0.044 ), EMT-paramedic response (EMT-P, OR = 1.713, 95% CI: 1.282–2.290, p < 0.001 ), and prehospital defibrillation using an automated external defibrillator ([AED] OR = 3.984, 95% CI: 2.920–5.435, p < 0.001 ) were statistically and significantly associated with survival to hospital discharge. The cut-off value was 6.2 min. If the location of OHCA was a public place or bystander CPR was provided, the threshold was prolonged to 7.2 min and 6.3 min, respectively. In the absence of a witness, EMT-P, or AED, the threshold was reduced to 4.2, 5, and 5 min, respectively. The adjusted OR of EMS response time for survival to hospital discharge was 1.217 (per minute shorter, CI: 1.140–1299, p < 0.001 ) and 1.992 (<6.2 min, 95% CI: 1.496–2.653, p < 0.001 ). The optimal response time threshold for survival to hospital discharge was 6.2 min. In the case of OHCA in public areas or with bystander CPR, the threshold was prolonged, and without witness, the optimal response time threshold was shortened.


2000 ◽  
Vol 75 (6) ◽  
pp. 247-253 ◽  
Author(s):  
Ing-Ray Chen ◽  
Ding-Chau Wang ◽  
Chih-Ping Chu

2020 ◽  
Vol 48 (1) ◽  
pp. 35-36
Author(s):  
Ziv Scully ◽  
Lucas van Kreveld ◽  
Onno Boxma ◽  
Jan-Pieter Dorsman ◽  
Adam Wierman

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