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Aero-Sim: An NS-2 Based simulator for Aeronautical Ad Hoc Networks
( Qin Luo ),( Junfeng Wang ),( Xiaoqing Wang ),( Ke Wu ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.7
Recently, there has been a clear trend towards the application of ad hoc networking technology in civil aviation communication systems, giving birth to a new research field, namely, aeronautical ad hoc networks (AANETs). An AANET is a special type of ad hoc wireless network with a significantly larger scale and distinct characteristics of its mobile nodes. Thus, there is an urgent need to develop a simulator to facilitate the research in these networks. In this paper, we present a network simulator, Aero-Sim, for AANETs. Aero-Sim, which is based on the freely distributed NS-2 simulator, enables detailed packet-level simulations of protocols at the MAC, link, network, transport, and application layers by composing simulations with existing modules and protocols in NS-2. Moreover, Aero-Sim supports three-dimensional network deployment. Through several case studies using realistic China domestic air traffic, we show that the proposed simulator can be used to simulate AANETs and can reproduce the real world with high fidelity.
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Soil characteristics and new formation model of loess on the Chinese Loess Plateau
Jingbo Zhao,Xiaoqing Luo,Yandong Ma,Tianjie Shao,Yingli Yue 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.4
In this paper characteristics of loess are discussed from a pedological perspective. A new model of loess formation is presented, developed in different soil formation processes according to its pedogenic characteristics, including soil structure, organic matter content and CaCO3 content. Loess has all the characteristics of typical soils and all five soil-forming factors have important roles in loess formation. In this regard, loess is a type soil and the previous concept of loess actually comprises various kinds of palaeosols developed in cold and arid climatic conditions. The loess-forming process is, in fact, equivalent to a pedogenic process and loess layers with different characteristics represent different pedogenic processes indicative of different environments, such as desert-steppe, steppe or forest-steppe climatic conditions. In contrast to red-brown palaeosol layers, which develop in warm and wet climates, loesses – more accurately called ‘loessial palaeosols’ – are grey-yellow palaeosols and can be regarded as a reliable indicator of cold and arid climate. The model of loess formation suggests that aeolian dust transfers to grey-yellow palaeosols via pedogenesis and the characteristics of loess are mainly a result of climatic conditions and diagenesis processes after its sedimentation. This new model of loess formation also suggests that traditional pedological theory has its limitations when explaining soil formation processes.
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Heartbeat Classification Using Decision Level Fusion
Zhancheng Zhang,Xiaoqing Luo 대한의용생체공학회 2014 Biomedical Engineering Letters (BMEL) Vol.4 No.4
Purpose Automatic heartbeat classification is an importanttechnique to assist doctors to identify ectopic heartbeats inlong-term ECG recording. In this paper, we employed amulti-lead fused classification schema to improve theperformance of heartbeat classification. Methods In this paper, we introduce a multi-lead fusedclassification schema, in which a multi-class heartbeatclassification task is decomposed into a serials of one-versusone(OvO) support vector machine (SVM) binary classifiers,then the corresponding OvO binary classifiers of all leads arefused based on the decision score of each binary classifier,the final label is predicted by voting the fused OvOclassifiers. The ECG features adopted include inter-beat andintra-beat intervals, amplitude morphology, area morphology,morphological distance and wavelet coefficients. Theelectrocardiograms (ECG) from the MIT-BIH arrhythmiadatabase (MIT-BIH-AR) are used to evaluate the proposedfusion method. Following the recommendation of theAdvancement of Medical Instrumentation (AAMI), all theheartbeat samples of MIT-BIH-AR are grouped into fourclasses, namely, normal or bundle branch block (N),supraventricular ectopic (S), ventricular ectopic (V) andfusion of ventricular and normal (F). The division of trainingand testing data complies with the inter-patient schema. Results Experimental results show that the average classificationaccuracy of the proposed feature selection method is87.88%, the sensitivities for the classes N, S, V and F are88.63%, 74.23%, 88.06% and 73.45% respectively, and thecorresponding positive predictive values are 98.54%, 59.76%,82.33% and 6.96% respectively. Conclusions The proposed method demonstrates betterperformance than the existing fusion methods.
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( Yujen Tseng ),( Lili Ma ),( Tiancheng Luo ),( Xiaoqing Zeng ),( Feng Li ),( Na Li ),( Yichao Wei ),( Shiyao Chen ) 대한간학회 2018 Gut and Liver Vol.12 No.5
Background/Aims: Gastroesophageal variceal hemorrhage is a common complication of portal hypertension. Endoscopic therapy is currently recommended for preventing gastroesophageal variceal rebleed. However, the rate of variceal rebleed and its associated mortality remain concerning. This study is aimed at differentiating patient response to endoscopic therapy based on endoscopic ultrasound (EUS) findings. Methods: One-hundred seventy patients previously treated with repeat endoscopic therapy for secondary prophylaxis were enrolled and classified into two groups based on treatment response. Prior to consolidation therapy, all patients received an EUS examination to observe for extraluminal phenomena. All available follow-up endoscopic examination records were retrieved to validate study results. Results: Of the 170 subjects, 106 were poor responders, while 64 were good responders. The presence of para-gastric, gastric perforating, and esophageal perforating veins was associated with poor patient response (p<0.001). The odds ratio for para-gastric veins was 5.374. Follow-up endoscopic findings for poor responders with incomplete variceal obliteration was closely correlated with the presence of para-gastric veins (p=0.002). Conclusions: The presence of para-gastric veins is a characteristic of poor response to endoscopic therapy for treating gastroesophageal varices. Early identification of this subgroup necessitates a change in course of treatment to improve overall patient outcome. (Gut Liver 2018;12:562- 570)
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