1,967 research outputs found
Event-based application modeling for analysis of asymmetric multicore-based mobile systems
No full textIn this paper, we suggest a generalized application model that can be utilized to support system-level execution behavior analysis of up-to-date and future mobile systems, and propose a new method (kernel event-based application modeling; KAM.2) that extracts the Android application models that are independent of processor configuration and system-management policies. To completely describe the dynamic behavior of a target application, KAM.2 analyzes the kernel events that are obtained when it is running on the system, instead of statically analyzing its source code. This analysis enables extraction of models of real-world applications, source code of which is generally not available. We validated the effectiveness of KAM.2 on a commercial smartphone with real world applications including user-interactive ones. The runtime overhead incurred by kernel tracing was 0.29%. In terms of core utilization, KAM.2 exhibited 2.58% of mean absolute errors on average and 0.93 of Pearson correlation coefficients on average. These results demonstrate that KAM.2 extracts reliable and realistic Android application models. Also, it was found that the application model extracted using KAM.2 is independent of processor configuration and system-management policies. Therefore, KAM.2 enables practical and flexible analysis of the dynamic behavior of recent and future mobile systems.11Nsciescopu
Proactive Scenario Characteristic-Aware Online Power Management on Mobile Systems
No full textModern mobile systems are requested to execute diverse user scenarios. Depending on the types of user scenarios, mobile systems utilize hardware resources differently. Thus, power management policies of mobile systems must adapt to various user scenarios. In this paper, we propose a dynamic voltage/frequency scaling (DVFS) policy to increase the energy efficiency of multicore mobile systems by adapting to user scenarios. The proposed policy provides effective power management regardless of user scenarios by using operation characteristics that can represent the execution behavior of various user scenarios. Furthermore, the proposed policy is suitable for modern mobile systems in which online power management is essential, because it does not require preliminary knowledge of target scenarios. To balance the trade-off between energy consumption and quality-of-service (QoS), the proposed scenario-aware policy provides 'just enough' processing speed to process the requested amount of work at the given parallelism level. To demonstrate the practicality of the proposed policy, we evaluated the effectiveness of the proposed scenario-aware policy for real-world user scenarios. Compared to the conventional DVFS policies, the proposed scenario-aware policy achieved a maximum of 25.5% energy saving on the mobile system that uses asymmetric multicore CPU, and a maximum of 30.7% energy saving on the mobile system that uses symmetric multicore CPU, without any QoS violation that degrades user experiences.11Ysciescopu
Analysis of PCV2 ORF2 region in the wild rats living around pig farms in Korea
No full textSeo, T.W.; Kim, Y.H.; Yoon, B.I.; Han, J.H.. (2008). Analysis of PCV2 ORF2 region in the wild rats living around pig farms in Korea. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/152827
Prevalence investigation of swine pathogens in the wild rodents and cats
No full textKim, Y.H.; Seo, T.W.; Yi, J.Y.; Hahn, T.W.; Kim, H.C.; Han, J.H.; Yoon, B.I.. (2008). Prevalence investigation of swine pathogens in the wild rodents and cats. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/155086
Ozonation of Han River humic substances
No full textThis study investigated the characteristics of extracted humic substances (HS) which are ubiquitous in river waters and affect the treatment of the water. HS were extracted from the Han River and the samples obtained were analyzed before/after oxidation with the following analytical methods: DOC, THMFP, UV-abs, chemical composition, molecular weight distribution, IR. Ozonation experiments were conducted in batch-type reactors. Ozone dose was 1 mg/L and contact time was varied from 0 to 20 minutes. The fraction of hydrophobic matter was 56.0% of total organic carbon in the Han River and the ratio of humic/fulvic acids was 22.4/77.6, showing high fractions of aromatic and/or double carbon bond functional groups and high fractions of saturated aliphatic carbons. Oxygen fraction of Han HS was relatively high compared with other humic substances (Suwannee River humic and fulvic acids), which are consistent with the results of IR spectra. The IR spectra showed the increase in aliphatic groups by ozonation of the Han HS. Humic substances could not completely be oxidized to CO2, H2O etc., but were partly oxidized to low molecular weight matter (aliphatics, aldehydes, carboxylics, polysaccharides etc.), so low removal efficiencies in terms of DOC (31∼35% with 5 minute contact) were observed. For UV254, 5 minute or shorter contact showed more than 80% removal efficiencies.</jats:p
A model for pseudo-Dirac neutrinos: leptogenesis and ultra-high energy neutrinos
No full textWe propose a model where sterile neutrinos are introduced to make light neutrinos to be pseudo-Dirac particles. It is shown how tiny mass splitting necessary for realizing pseudo-Dirac neutrinos can be achieved. Within the model, we show how leptogenesis can be successfully generated. Motivated by the recent observation of very high energy neutrino events at IceCube, we study a possibility to observe the effects of the pseudo-Dirac property of neutrinos by performing astronomical-scale baseline experiments to uncover the oscillation effects of very tiny mass splitting. We also discuss future prospect to observe the effects of the pseudo-Dirac property of neutrinos at high energy neutrino experiments. © 2016, The Author(s)3611Nsciescopu
Lip Lead as an Alternative Measure for Lead Exposure Assessment of Lead Battery Assembly
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