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Federated Feature Concatenate Method for Heterogeneous Computing in Federated Learning

Computers, Materials & Continua 2023年第4期75卷 351-371页

作者： Wu-Chun Chung Yung-Chin chang Ching-Hsien Hsu chih-hung chang Che-Lun hung Department of Information and Computer Engineering Chung Yuan Christian UniversityTaoyuanTaiwan Department of Computer Science and Information Engineering Asia UniversityTaichungTaiwan Department of Medical Research China Medical University HospitalChina Medical UniversityTaichungTaiwan Department of Computer Science&Communication Engineering Providence UniversityTaichungTaiwan Institute of Biomedical Informatics National Yang Ming Chiao Tung UniversityTaipeiTaiwan

Federated learning is an emerging machine learning techniquethat enables clients to collaboratively train a deep learning model withoutuploading raw data to the aggregation server. Each client may be equippedwith different computing resources for model training. The client equippedwith a lower computing capability requires more time for model training,resulting in a prolonged training time in federated learning. Moreover, it mayfail to train the entire model because of the out-of-memory issue. This studyaims to tackle these problems and propose the federated feature concatenate(FedFC) method for federated learning considering heterogeneous *** leverages the model splitting and feature concatenate for offloadinga portion of the training loads from clients to the aggregation server. Eachclient in FedFC can collaboratively train a model with different cutting ***, the specific features learned in the deeper layer of the serversidemodel are more identical for the data class classification. Accordingly,FedFC can reduce the computation loading for the resource-constrainedclient and accelerate the convergence time. The performance effectiveness isverified by considering different dataset scenarios, such as data and classimbalance for the participant clients in the experiments. The performanceimpacts of different cutting layers are evaluated during the model *** experimental results show that the co-adapted features have a criticalimpact on the adequate classification of the deep learning model. Overall,FedFC not only shortens the convergence time, but also improves the bestaccuracy by up to 5.9% and 14.5% when compared to conventional federatedlearning and splitfed, respectively. In conclusion, the proposed approach isfeasible and effective for heterogeneous clients in federated learning.

关键词： Federated learning deep learning artificial intelligence heterogeneous computing

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Relationship between mode of sport training and general cognitive performance

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Journal of Sport and Health Science 2017年第1期6卷 89-95页

作者： Erik chih-hung chang Chien-Heng Chu Costas I.Karageorghis Chun-chih Wang Jack Han-Chao Tsai Yung-Shun Wang Yu-Kai chang Institute of Cognitive Neuroscience "Central University" Graduate Institute of Athletics and Coaching Science Taiwan Sport University Department of Life Sciences Brunel University London Institute of Neuroscience Yang-Ming University

Purpose: To investigate whether athletes who engage in different modes of sports training correspondingly exhibit different patterns of performance on general cognition ***: Sixty participants were recruited into an endurance, motorically complex, or control group, and were administered a series of physical tests and neuropsychological ***: Athletes in the endurance group demonstrated the highest levels of cardiovascular fitness and those in the motorically complex group exhibited the highest levels of motor fitness. Nonetheless, no differences in cognitive performance were observed between the 3 ***: These findings indicate that the mode of sport training, which results in either high cardiovascular or high motor fitness, bears no relationship to measures of general cognition in elite athletes. The present findings suggest that coaches and athletic trainers should be encouraged to monitor athletes' stress levels during training in order to maximize the beneficial effects of such training on general cognitive performance.

关键词： Cognitive function Executive control Expert Motor fitness Physical fitness Sport

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Hausdorff Dimension of Multi-Layer Neural Networks

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Advances in Pure Mathematics 2013年第9期3卷 9-14页

作者： Jung-Chao Ban chih-hung chang Department of Applied Mathematics Feng Chia University Taichung Taiwan Department of Applied Mathematics National Dong Hwa University Hualien Taiwan

This elucidation investigates the Hausdorff dimension of the output space of multi-layer neural networks. When the factor map from the covering space of the output space to the output space has a synchronizing word, the Hausdorff dimension of the output space relates to its topological entropy. This clarifies the geometrical structure of the output space in more details.

关键词： Multi-Layer Neural Networks Hausdorff Dimension Sofic Shift Output Space

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Numerical Simulation of an Aortic Flow Based on a HLLC Type Incompressible Flow Solver

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Communications in Computational Physics 2009年第1期5卷 142-162页

作者： Yang-Yao Niu chih-hung chang Wen-Yih I.Tseng Hsu-Hsia Peng Hsi-Yu Yu Department of Mechanical Engineering Chung-Hua UniversityHsin-Chu30067 Taiwan National Taiwan University Hospital No.7Chung-Shan South RoadTaipeiTaiwan

In this study,a three-dimensional artificial compressibility solver based on the average-state Harten-Lax-van Leer-Contact(HLLC)[13]type Riemann solution is first proposed and developed to solve the time-dependent incompressible flow *** implement unsteady flow calculations,a dual time stepping strategy including the LU decomposition method is used in the pseudo-time iteration and the second-order accurate backward difference is adopted to discretize the unsteady flow *** a third-order accurate HLLC numerical flux is derived for approximating the inviscid *** verify numerical accuracy,flows over a lid-driven cavity and an oscillating flat plate are chosen as the benchmark *** addition,the current solver is extended to solve blood flows in a realistic human aorta measured from MRI(Magnetic Resonance Imaging).The simulation geometry was derived from a three-dimensional reconstruction of a series of two-dimensional slices obtained in *** results demonstrate wall stresses were highly dynamic,but were generally high along the outer wall in the vicinity of the branches and low along the inner wall,particularly in the descending *** maximum wall stress distribution is presented on the aortic arch in the *** addition,extensive counter-clockwise secondary flows and three-dimensional helical vortex influenced considerably by the presence of vessel contraction,torsion and the branches were shown in the descending aorta in the late systole and early diastolic cycles.

关键词： HLLC Riemann solver incompressible flow aortic flow fluid-structure interaction

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Unusual capitate fracture with dorsal shearing pattern and concomitant carpometacarpal dislocation with a 6-year follow-up:A case report

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World Journal of Clinical Cases 2023年第9期11卷 2060-2066页

作者： Chien-Cheng Lai Hsu-Wei Fang chih-hung chang Jwo-Luen Pao Chun-Chien chang Yeong-Jang Chen Department of Orthopedic Surgery Far Eastern Memorial HospitalNew Taipei City 220Taiwan Department of Chemical Engineering and Biotechnology National Taipei University of TechnologyTaipei 106Taiwan Graduate School of Biotechnology and Bioengineering Yuan Ze UniversityTaoyuan 320Taiwan Department of Orthopedics Fu Jen Catholic University HospitalFu Jen Catholic UniversityNew Taipei City 243Taiwan

BACKGROUND Isolated capitate fractures are rare carpal *** high-energy injuries,capitate fractures are usually associated with other carpal fractures or ligament *** management of capitate fractures depends on the fracture ***,we report an unusual capitate fracture with a dorsal shearing pattern and concomitant carpometacarpal dislocation,with a 6-year *** the best of our knowledge,this fracture pattern and surgical management have not been previously *** SUMMARY A 28-year-old man presented with left-hand volar tenderness and decreased grip strength that persisted for one month after a traffic *** showed a distal capitate fracture with carpometacarpal joint *** tomography(CT)revealed a distal capitate fracture with carpometacarpal joint *** distal fragment was rotated by 90°in the sagittal plane,and an oblique shearing fracture pattern was *** reduction and internal fixation(ORIF)with a locking plate were performed using the dorsal *** imaging studies performed 3 mo and 6 years following surgery revealed a healed fracture,and the Disabilities of the Arm,Shoulder,and Hand and visual analog scale scores were significantly *** CT can detect capitate fractures with dorsal shearing pattern and concomitant carpometacarpal *** using a locking plate are possible.

关键词： Isolated capitate fracture Carpometacarpal dislocation Dorsal intercarpal ligament Case report

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Single-incision vs three-incision laparoscopic cholecystectomy for complicated and uncomplicated acute cholecystitis

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World Journal of Gastroenterology 2013年第43期19卷 7743-7750页

作者： Shu-hung Chuang Pai-Hsi Chen chih-Ming chang chih-Sheng Lin Department of Biological Science and Technology National Chiao Tung University Department of Surgery Mackay Memorial HospitalHsin-Chu Branch College of Management Fu Jen Catholic University Department of Nursing Mackay Memorial HospitalHsin-Chu Branch

AIM:To compare the clinical outcome of single-incision laparoscopic cholecystectomy(SILC)and three-incision laparoscopic cholecystectomy(3ILC)for acute ***:From July 2009 to September 2012,136patients underwent SILC or 3ILC for acute cholecystitis at a tertiary referral *** experienced surgeon performed every procedure using 5 or 10 mm 30-degree laparoscopes,straight instruments,and conventional *** patients with perforated gallbladder and diffuse peritonitis and 23 patients with mild acute cholecystitis were *** remaining 108 patients were divided into complicated and uncomplicated groups according to pathologic *** demography,clinical data,operative results and complications were recorded and ***:Fifty patients with gangrenous cholecystitis,gallbladder empyema,or hydrops were classified as the complicated group,and 58 patients with acute cholecystitis were classified as the uncomplicated ***-three(46.0%)of the patients in the complicated group(n=50)and 39(67.2%)of the patients in the uncomplicated group(n=58)underwent SILC;all others underwent *** postoperative length of hospital stay(PLOS)was significantly shorter in the SILC subgroups than the 3ILC subgroups(3.5±1.1 d vs 4.6±1.3 d,P<0.01 in the complicated group;2.9±1.1 d vs 3.7±1.4 d,P<0.05 in the uncomplicated group).The maximum body temperature recorded at day 1 and at day 2 following the procedure was lower in the SILC subgroups,but the difference reached statistical significance only in the uncomplicated group(37.41±0.56℃vs 37.80±0.72℃,P<0.05 on postoperative day 1;37.10±0.43℃vs 37.57±0.54℃,P<0.01 on postoperative day 2).The operative time,estimated blood loss,postoperative narcotic use,total length of hospital stay,conversion rates,and complication rates were similar in both SILC and 3ILC *** complicated group had longer operative time(122.2±35.0 min vs 106.6±43.6 min,P<0.05),longer PLOS(4.1±1.3 d vs 3.2±1.2 d,P<0.

关键词： Single-incision laparoscopic cholecystectomy Single-incision laparoscopic surgery Laparoen doscopic single site surgery Cholecystectomy Acute cholecystitis Complicated cholecystitis Gangrenous cholecystitis

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Preparation and characterization of nano-rare earth composite materials:application in selectivity catalytic oxidation of ammonia and its cytotoxicity study

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Journal of Rare Earths 2010年第S1期28卷 362-366页

作者： chang-Mao hung Department of Vehicle Engineering Yung-Ta Institute of Technology and Commerce316 Chung-Shan RoadLinloPingtung 909Taiwan

The manufacture,physical characterization,environmental applications and cytotoxicity properties of nanocomposites consisting of CuO/CeO2 nano-rare earth composite materials prepared using the coprecipitation method at molar ratio of 6:4 with aqueous solutions of copper nitrate and cerium nitrate were *** performance of the selective catalytic oxidation of ammonia to N2(NH3-SCO) over a CuO/CeO2 nano-rare earth composite materials in a tubular fixed-bed reactor(TFBR) at temperatures from 423 to 673 K in the presence of oxygen was *** catalytic redox behavior was determined by cyclic voltammetry(CV).The nanocomposite particles were characterized by TEM,with a tiny particle size around 10 nm with high dispersion ***,cell cytotoxicity and the percentage cell survival were determined by using 3-(4,5-dimethylthiazol-2-yl)-5(3-carboxymethoxyphenol)-2-(4-sulfophenyl)-2H-tetra-zolium(MTS) assay on human lung MRC-5 cell *** results showed that no apparent cytotoxicity was observed when the MRC-5 was exposed to the CuO/CeO2 nanocomposite materials.

关键词： selective catalytic oxidation (SCO) tubular fixed-bed reactor (TFBR) ammonia CuO/CeO2 nanocomposite material cytotoxicity rare earths

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A Meshless Method for Retrieving Nonlinear Large External Forces on Euler-Bernoulli Beams

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Computers, Materials & Continua 2022年第10期73卷 433-451页

作者： chih-Wen chang Department of Mechanical Engineering National United UniversityMiaoli360302Taiwan

We retrieve unknown nonlinear large space-time dependent forces burdened with the vibrating nonlinear Euler-Bernoulli beams under varied boundary data,comprising two-end fixed,cantilevered,clamped-hinged,and simply supported conditions in this *** though some researchers used several schemes to overcome these forward problems of Euler-Bernoulli beams;however,an effective numerical algorithm to solve these inverse problems is still not *** cope with the homogeneous boundary conditions,initial data,and final time datum for each type of nonlinear beam by employing a variety of boundary shape *** unknown nonlinear large external force can be recuperated via back-substitution of the solution into the nonlinear Euler-Bernoulli beam equation when we acquire the solution by utilizing the boundary shape function scheme and deal with a smallscale linear system to gratify an additional right-side boundary *** the robustness and accuracy,we reveal that the current schemes are substantiated by comparing the recuperated numerical results of four instances to the exact forces,even though a large level of noise up to 50%is burdened with the overspecified *** current method can be employed in the online real-time computation of unknown force functions in space-time for varied boundary supports of the vibrating nonlinear beam.

关键词： Inverse problems nonlinear Euler-Bernoulli beams ill-posed problems nonlinear space-time dependent force boundary shape functions

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Solving Cauchy Issues of Highly Nonlinear Elliptic Equations Using a Meshless Method

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Computers, Materials & Continua 2022年第8期72卷 3231-3245页

作者： chih-Wen chang Department of Mechanical Engineering National United UniversityMiaoli360302Taiwan

In this paper,we address 3D inverse Cauchy issues of highly nonlinear elliptic equations in large cuboids by utilizing the new 3D homogenization functions of different orders to adapt all the specified boundary *** also add the average classification as an approximate solution to the nonlinear operator part,without requiring to cope with nonlinear equations to resolve the weighting coefficients because these constructions are owned many conditions about the true *** unknown boundary conditions and the result can be retrieved straightway by coping with a small-scale linear system when the outcome is described by a new 3D homogenization function,which is right to find the numerical solutions with the errors smaller than the level of noise being put on the over-specified Neumann conditions on the bottom of the ***,note that the new homogenization functions method(HFM)does not require dealing with the regularization and highly nonlinear *** robustness and accuracy of the HFM are verified by comparing the recovered results of several numerical experiments to the exact solutions in the entire region,even though a very large level of noise 50%is imposed on the over specified Neumann *** numerical errors of our scheme are in the order of O(10^(−1))-O(10^(−4)).

关键词： Inverse cauchy problems homogenization functions method(HFM) 3D highly nonlinear elliptic equations 3D homogenization functions

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AN AHP MODEL FOR BRINGING EXPERTS TO CONSENSUS ON MEDICAL PAYMENT STANDARDS

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Journal of Systems Science and Systems Engineering 2006年第2期15卷 247-255页

作者： Yuan-Huei HUANG Pei-Yeh chang chih-Young hung Kuei-Ing WANG King-Jen chang Department of Surgery Hsin-Chu General HospitalTaiwanChina Department of Pediatric Surgery Chang Gung Children’s HospitalChang Gung UniversityCollege of MedicineTaiwanChina Institute of Management of Technology National Chiao Tung UniversityTaiwanChina Department of Information Management Ming Hsin University of Science and TechnologyTaiwanChina Department of Surgery National Taiwan University HospitalTaiwanChina

Many countries with health insurance systems conduct periodic payment standards reform. How to reach consensus in setting payment standards among different specialties with different agendas has become a critical issue. The purpose of this study is to construct an analytic hierarchy process （AHP） model to obtain judgments from experts about the importance of ＂factors related to establishing payment standards in the national health insurance program＂. Under this goal, the first tier contains four evaluation aspects, and the second tier contains sixteen evaluation criteria divided into four groups The AHP model was then used to collect and combine the opinions of experts through an empirical study. The results can be directly used to formulate standard values as the basis for establishing payment standards. The results of our study strongly support that an AHP model is effective in forming a consensus among surgical specialists.

关键词： National Health Insurance Analytic Hierarchy Process payment standards

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