The nature of relaxation processes revealed by the action signals of phase modulated light fields

We introduce a generalized theoretical approach to study action signals induced by the absorption of two-photons from two phase modulated laser beams and subject it to experimental testing for two types of photoactive samples, solution of rhodamine 6G and GaP photodiode. In our experiment, the phases of the laser beams are modulated at the frequencies f1 and f2, respectively. The action signals, such as photoluminescence and photocurrent, which result from the absorption of two photons, are isolated at frequencies m f (f=|f1-f2|, m=0,1,2...). We demonstrate that the ratio of the amplitudes of the secondary (m=2) and the primary (m=1) signals is sensitive to the type of relaxation process taken place in the system and thus can be used for its identification. Such sensitivity originates from cumulative effects of non-equilibrated state of the system between the light pulses. When the cumulative effects are small, i.e. the relaxation time is much shorter then the laser repetition rate or the laser intensity is high enough to dominate the system behavior, the ratio achieves its reference value 1:4 (the signature of two-photon absorption). In the intermediate regimes the ratio changes rapidly with the growth of intensity from zero value in case of second order relaxation process, while it demonstrates slow monotonic decrease for linear relaxation. In the article we also determine the value of the recombination rate in a GaP photodiode by using the above approach

A Novel Packet Scheduling Scheme for Downlink LTE System

[[abstract]]Long term evolution (LTE) is the next generation wireless system. There are not many researches for LTE downlink scheduling. It uses orthogonal frequency division multiple access (OFDMA) in downlink. Until now, the goal for the LTE scheduler is achieving the system highest performance, but it will cause to lower priority connection delay or starvation under limited bandwidth resources. Therefore, we design a LTE downlink scheduling scheme and resource allocation strategy which are not only to achieve the system highest performance, but also avoid latency and starvation problem.[[notice]]補正完畢[[conferencetype]]國際[[conferencedate]]20111014~20111016[[iscallforpapers]]Y[[conferencelocation]]Dalian, China[[countrycodes]]CH

HIP-based Handover Mechanism under MIH Architecture in Heterogeneous Wireless Networks

[[abstract]]In this paper, we offers a HIP-based vertical handover scheme under MIH architecture in heterogeneous wireless network. Many diversity wireless access technologies are offering in Next Generation Wireless Networks (NGWN). In NGWN, the integration of wireless access network will be accomplished by seamless handover which contains many challenges i.e. service mobility, vertical handover, common authentication, unified accounting/billing, security mechanisms, QoS and service provisioning, etc. Toward this direction, our research aims to provide a complete integration of heterogeneous network architecture and support a fit mobility management for network to seamless handover. We focus on simulation about vertical handover execution for WiMAX to WiFi scenario. Our idea can modify defects of Mobile IP and SIP. And it provides internet users always best connection. Moreover, we hope to contribute our research to beyond 4G wireless networks.[[notice]]補正完畢[[conferencetype]]國際[[conferencedate]]20110621~20110623[[booktype]]紙本[[booktype]]電子版[[iscallforpapers]]Y[[conferencelocation]]Gyeongju, Korea[[countrycodes]]KO

Transferability of Alzheimer disease polygenic risk score across populations and its association with Alzheimer disease-related phenotypes

IMPORTANCE: Polygenic risk scores (PRSs), which aggregate the genetic effects of single-nucleotide variants identified in genome-wide association studies (GWASs), can help distinguish individuals at a high genetic risk for Alzheimer disease (AD). However, genetic studies have predominantly focused on populations of European ancestry. OBJECTIVE: To evaluate the transferability of a PRS for AD in the Korean population using summary statistics from a prior GWAS of European populations. DESIGN, SETTING, AND PARTICIPANTS: This cohort study developed a PRS based on the summary statistics of a large-scale GWAS of a European population (the International Genomics of Alzheimer Project; 21 982 AD cases and 41 944 controls). This PRS was tested for an association with AD dementia and its related phenotypes in 1634 Korean individuals, who were recruited from 2013 to 2019. The association of a PRS based on a GWAS of a Japanese population (the National Center for Geriatrics and Gerontology; 3962 AD cases and 4074 controls) and a transancestry meta-analysis of European and Japanese GWASs was also evaluated. Data were analyzed from December 2020 to June 2021. MAIN OUTCOMES AND MEASURES: Risk of AD dementia, amnestic mild cognitive impairment (aMCI), earlier symptom onset, and amyloid β deposition (Aβ). RESULTS: A total of 1634 Korean patients (969 women [59.3%]), including 716 individuals (43.6%) with AD dementia, 222 (13.6%) with aMCI, and 699 (42.8%) cognitively unimpaired controls, were analyzed in this study. The mean (SD) age of the participants was 71.6 (9.0) years. Higher PRS was associated with a higher risk of AD dementia independent of APOE ɛ4 status in the Korean population (OR, 1.95; 95% CI, 1.40-2.72; P \u3c .001). Furthermore, PRS was associated with aMCI, earlier symptom onset, and Aβ deposition independent of APOE ɛ4 status. The PRS based on a transancestry meta-analysis of data sets comprising 2 distinct ancestries showed a slightly improved accuracy. CONCLUSIONS AND RELEVANCE: In this cohort study, a PRS derived from a European GWAS identified individuals at a high risk for AD dementia in the Korean population. These findings emphasize the transancestry transferability and clinical value of PRSs and suggest the importance of enriching diversity in genetic studies of AD

Distributed Fault-Tolerant Embeddings of Rings in Incrementally Extensible Hypercubes with Unbounded Expansion

[[abstract]]The Incrementally Extensible Hypercube (IEH) is a generalization of interconnection network that is derived from the hypercube. Unlike the hypercube, the IEH can be constructed for any number of nodes. That is, the IEH is incrementally expandable. In this paper, the problem of embedding and reconfiguring ring structures is considered in an IEH with faulty nodes. There are a novel embedding algorithm proposed in this paper. The embedding algorithm enables us to obtain the good embedding of a ring into a faulty IEH with unbounded expansion, and such the result can be tolerated up to O(n*log2m ) faults with congestion 1, load 1, and dilation 4. The presented embedding methods are optimized mainly for balancing the processor loads, while minimizing dilation and congestion as far as possible.[[notice]]補正完畢[[journaltype]]國際[[incitationindex]]EI[[ispeerreviewed]]Y[[booktype]]紙本[[countrycodes]]TW

Structure of technology evolution

노트 : 24th European Regional Conference of the International Telecommunication Societ

Dynamic Imaging of Hydrate Specific Area Evolution during Xenon Hydrate Formation

Gas hydrates are ice-like structures formed under high pressure and low temperature conditions. They are considered as a potential energy source due to their abundance and the increase in energy demand worldwide. A fundamental understanding of hydrate formation and dissociation kinetics is essential in order to improve gas productivity from natural hydrates reservoirs. This paper investigates the evolution of hydrate specific area during the process of hydrate formation using dynamic 3D synchrotron microcomputed tomography. Xenon hydrate was formed inside a high-pressure low-temperature cell, filled with silica sand partially saturated with water. The cell has a height of 70.2 mm and an inner diameter of 9.7 mm, and is capable of sustaining an internal pressure of 150 MPa. During hydrate formation and dissociation, full 3D images are acquired at a time resolution of 45 seconds and a spatial resolution of 5.38 ?m/voxel. The reconstructed images were enhanced and segmented, and direct volume and surface area measurements were obtained. Initially, the specific area of hydrate increased with increasing hydrate saturation up to a certain hydrate saturation threshold (9% hydrate saturation). After this threshold, hydrate specific area started to decrease with increasing hydrate saturation. This is an indication that the small crystals of hydrates tend to merge and form larger crystals during the process of hydrate formation.This publication was made possible by partial funding from NPRP grant # NPRP8- 594-2-244 from the Qatar national research fund (a member of Qatar Foundation) and the Institute for a Secure and Sustainable Environment (ISSE), University of Tennessee- Knoxville, USA. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of funding agencies. This paper used resources of the Advanced Photon Source (APS), a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory (ANL) under Contract No. DE-AC02-06CH11357. The PSMT images presented in this paper were collected using the x-ray Operations and Research Beamline Station 13-BMD at Argonne Photon Source (APS), ANL. We thank Dr. Mark Rivers of APS for help in performing the SMT scans. We also acknowledge the support of GeoSoilEnviroCARS (Sector 13), which is supported by the National Science Foundation, Earth Sciences (EAR-1128799), and the DOE, Geosciences (DE-FG02-94ER14466)

An Integrated Building Fire Evacuation System with RFID and Cloud Computing

[[abstract]]Building fire is a common disaster happening in our daily life that causes unfortunate casualties and deaths. Successfully escaping from fire depends on the design of evacuation route and time, as most of the damage of fire is caused due to lack of evacuation equipments or poor design of the emergency route. In this research work, we designed a hybrid building fire evacuation system (HBFES) on a mobile phone using Radio Frequency Identification (RFID) techniques and Cloud Computing. The system will be implemented at Tamkang University on Lanyang campus. Several existing computer or mobile phone applications, namely Viewpoint Calculator, Path planner, and MobiX3D viewer will be used on the system to rapidly calculate reliable evacuation routes when building fire takes place.[[notice]]補正完畢[[conferencetype]]國際[[conferencedate]]20111014~10111016[[ispeerreviewed]]Y[[booktype]]紙本 電子版[[iscallforpapers]]Y[[conferencelocation]]Dalian, China[[countrycodes]]CH