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Data Faultage in Data Resource
Daniel Hsu,Shardrom Johnson,Miao Hui 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.6
Faultage is a specialized term in geology, but it can be used to describe some characteristics vividly in data resource. In this paper, we set up the preliminary theoretical system of data faultage to lay the foundation of later research and make contribution to the structure standardization of data resource. More concretely, data faultage in six areas has been enumerated firstly. Then, the conception of data faultage is presented on the theory of geological faultage, and the details of data faultage are discussed on the microscopic view. Finally, we make a verification case based on data faultage, some information from Shanghai Media Group are used to analyze the distribution of its listeners, and the theoretical system of data faultage are verified.
파라미터 기반 효율적 전투기/공격기 설계 데이터 베이스 개발 연구
Hsu Myat Naing,Daniel Neufeld,Jae-Woo Lee,Sangho Kim,Yung-Hwan Byun 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11
This paper describes an efficient methodology for Database development for aircraft design based on parameters. This methodology can provide prediction of related parameters when insufficient data is known for an arbitrary aircraft. By using this methodology, aircraft performance, propulsion and aerodynamic data can be rapidly calculated. Fighter and attack aircraft are focused in this Database development. The methodology is firstly implemented based on known parameters which are collected from public domain sources and the approximation library is performed to predict related unknown data using approximation models. By using this database, the analysis of performance, aerodynamics and propulsion of aircraft are performed based on empirical and theoretical equations. The necessary codes for the analysis were developed and validated. In this study, database with forty-three different types of fighter and attack aircrafts has been constructed to demonstrate the feasibility, effectiveness and rapidness of the database development methodology.
Possibility Based Small Aircraft Design Optimization Using Database Driven Uncertainty Approach
Hsu Myat Naing,Daniel Neufeld,Nguyen Nhu Van,Maxim Tyan,Jae-Woo Lee,Sangho Kim 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.4
Since deterministic optimization method without considering uncertainty lead to unreliable designs, it is required to consider design methods that take into account of the input uncertainty. In this study, uncertainties which are from the analysis methods that do not perfectly correspond to physical phenomenon are taken into account in optimization process. Possibility Base Design Optimization Design Optimization is one of the methods for accounting for uncertainties by modeling each source of uncertainty as a fuzzy number. Possibility Base Design Optimization with performance measure approach that improves numerical efficiency and stability is used in this design optimization. This paper describes a process that implements a design optimization using possibility theory to perform small aircraft conceptual design optimization in order to produce results that are more conservative but more trustworthy than conventional optimization approach.
Chia-Yu Hsu,Daniel E. Singer,Hooman Kamel,Yi-Ling Wu,Pei-Chun Chen,Jiann-Der Lee,Meng Lee,Bruce Ovbiagele 대한뇌졸중학회 2019 Journal of stroke Vol.21 No.2
Background and Purpose Preceding episodes of paroxysmal atrial fibrillation (AF) among stroke patients can be easily overlooked in routine clinical practice. We aim to determine whether an unrecognized history of paroxysmal AF is associated with an increased risk of recurrent stroke. Methods We retrospectively identified all adult patients hospitalized with a primary diagnosis of ischemic stroke who had no AF diagnosis on their discharge records, using the Taiwan National Health Insurance Research Database between January 2001 and December 2012. Patients were categorized into two groups: unrecognized AF history and no AF. Patients with unrecognized AF history were defined as having documented AF preceding the index ischemic stroke hospitalization, but not recording at the index ischemic stroke. Primary endpoint was recurrent stroke within 1 year after the index stroke. Results Among 203,489 hospitalized ischemic stroke patients without AF diagnosed at discharge, 6,731 patients (3.3%) had an unrecognized history of prior transient AF. Patients with an unrecognized AF history, comparing to those without AF, had higher adjusted risk of all recurrent stroke ([original cohort: hazard ratio (HR), 1.41; 95% confidence interval [CI], 1.30 to 1.53], [matched cohort: HR, 1.51; 95% CI, 1.37 to 1.68]) and recurrent ischemic stroke ([original cohort: HR, 1.42; 95% CI, 1.30 to 1.55], [matched cohort: HR, 1.56; 95% CI, 1.40 to 1.74]) during the 1-year follow-up period. Conclusions Unrecognized history of AF among patients discharged after an index ischemic stroke hospitalization is associated with higher recurrent stroke risk. Careful history review to uncover a paroxysmal AF history is important for ischemic stroke patients.
Prevalence and Incidence of Epilepsy in an Elderly and Low-Income Population in the United States
Derek H. Tang,Daniel C. Malone,Terri L. Warholak,Jenny Chong,Edward P. Armstrong,Marion K. Slack,Chiu-Hsieh Hsu,David M. Labiner 대한신경과학회 2015 Journal of Clinical Neurology Vol.11 No.3
Background and Purpose Te purpose of this study was to estimate the incidence and prevalence of epilepsy among an elderly and poor population in the United States. Methods Arizona Medicaid claims data from January 1, 2008 to December 31, 2010 were used for this analysis. Subjects who were aged ≥65 years and were continuously enrolled in any Arizona Medicaid health plans (eligible to patients with low income) for ≥12 months between January 1, 2008 and December 31, 2009 were considered eligible for inclusion in the study cohort. In addition to meeting the aforementioned criteria, incident and prevalent cases must have had epilepsy-related healthcare claims. Furthermore, incident cases were required to have a 1-year “clean” period immediately preceding the index date. Negative binomial and logistic regression models were used to assess the factors associated with epilepsy incidence and prevalence. Results Te estimated epilepsy incidence and prevalence for this population in 2009 were 7.9 and 19.3 per 1,000 person-years, respectively. Te incidence and prevalence rates were signifcantly higher for patients with comorbid conditions that were potential risk factors for epilepsy and were of younger age than for their non-comorbid and older counterparts (p<0.05). Te prevalence rates were signifcantly higher for non-Hispanic Blacks and male benefciaries than for non-Hispanic Whites and female benefciaries, respectively (p<0.05). Conclusions Tis patient population had higher epilepsy incidence and prevalence compared with the general US population. Tese diferences may be at least in part attributable to their low socioeconomic status.