Yu‐Jen Liu

ORCID: 0000-0003-0419-292X
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About
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Research Areas
  • Microgrid Control and Optimization
  • Power Quality and Harmonics
  • Photovoltaic System Optimization Techniques
  • Smart Grid Energy Management
  • Optimal Power Flow Distribution
  • Power Systems and Renewable Energy
  • Real-time simulation and control systems
  • Magnetic Properties and Applications
  • Energy Load and Power Forecasting
  • Islanding Detection in Power Systems
  • Lightning and Electromagnetic Phenomena
  • Electric Vehicles and Infrastructure
  • solar cell performance optimization
  • Welding Techniques and Residual Stresses
  • Power Transformer Diagnostics and Insulation
  • Solar Radiation and Photovoltaics
  • Machine Fault Diagnosis Techniques
  • Electromagnetic Compatibility and Noise Suppression
  • High voltage insulation and dielectric phenomena
  • Power System Optimization and Stability
  • Wind Turbine Control Systems
  • Modeling and Simulation Systems
  • Hydraulic and Pneumatic Systems
  • Radiomics and Machine Learning in Medical Imaging
  • HVDC Systems and Fault Protection

National Chung Cheng University
2016-2025

Linkou Chang Gung Memorial Hospital
2019-2023

Chang Gung University
2018-2023

Chang Gung Memorial Hospital
2017-2020

National Kaohsiung University of Science and Technology
2018

National Yunlin University of Science and Technology
2018

National Kaohsiung University of Applied Sciences
2017-2018

Electronics Testing Center
2013-2017

Memorial Hospital of South Bend
2017

Shanghai Sixth People's Hospital
2016

The fast Fourier transform (FFT) has been widely used for the signal processing because of its computational efficiency. Because spectral leakage and picket-fence effects associated with system fundamental frequency variation improperly selected sampling time window, a direct application FFT algorithm constant rate may lead to inaccurate results continuously measuring power harmonics interharmonics. An improved FFT-based measure interharmonics accurately is proposed. In proposed algorithm,...

10.1049/iet-gtd:20070205 article EN IET Generation Transmission & Distribution 2008-02-14

Abstract The pathological identification of lymph node (LN) metastasis is demanding and tedious. Although convolutional neural networks (CNNs) possess considerable potential in improving the process, ultrahigh-resolution whole slide images hinders development a clinically applicable solution. We design an artificial-intelligence-assisted LN assessment workflow to facilitate routine counting metastatic LNs. Unlike previous patch-based approaches, our proposed method trains CNNs by using...

10.1038/s41467-022-30746-1 article EN cc-by Nature Communications 2022-06-10

It is known that artificial neural network a powerful scheme for function learning and modeling nonlinear loads. However, direct application of time-varying loads may lead to inaccuracies. This paper presents an accurate neural-network-based method the highly voltage-current characteristic ac electric arc furnace (EAF). The model can be effectively used assess waveform distortions, voltage fluctuations, performances reactive power compensation devices associated with EAF in system....

10.1109/tpwrs.2009.2036711 article EN IEEE Transactions on Power Systems 2009-12-16

Limited studies investigated clinicopathological and prognostic significance of histologic molecular subgroups gastric cancer concurrently. We retrospectively enrolled 1,248 patients with who received radical gastrectomy lymphadenectomy classified these cases into the Epstein–Barr virus (EBV)‐associated microsatellite instability (MSI)‐associated subtypes by EBV‐encoded small RNA in situ hybridization immunohistochemical stains for DNA mismatch repair proteins, respectively. The remaining...

10.1002/ijc.32215 article EN International Journal of Cancer 2019-02-16

Pathologic diagnosis of nasopharyngeal carcinoma (NPC) can be challenging since most cases are nonkeratinizing with little differentiation and many admixed lymphocytes. Our aim was to evaluate the possibility identify NPC in biopsies using deep learning. A total 726 were included. Among them, 100 randomly selected as testing set, 20 validation all other 606 training set. All three datasets had equal numbers benign cases. Manual annotation performed. Cropped square image patches 256 × pixels...

10.3390/cancers12020507 article EN Cancers 2020-02-22

This letter presents an extended Mayr's equation-based model for the pantograph detachment arc of high-speed railway traction system. The proposed is composed behavior control and time-controlled switches starting reattachment events, which are developed by MODELS language TACS in Electromagnetic Transients Program/Alternate Program. With combination a motor drive circuit, effective simulation performed to observe harmonic spectrum current that caused arcs. By comparing this with actual...

10.1109/tpwrd.2009.2037521 article EN IEEE Transactions on Power Delivery 2010-06-29

With the huge integration of PV Power generations into electric grids it causes voltage fluctuation that cannot be ignored. To mitigate this problem, is possible to seek utilization inverter-based resources with specific controls in microgrid. Therefore, paper proposes a coordinated inverters control combines traditional Voltage/Var and grid-forming for regulation microgrid system. A distribution system level AC several installations modelled; simulation scenarios under individual,...

10.1049/icp.2024.4139 article EN IET conference proceedings. 2025-01-01

Aims In this study, we examine the clinicopathological and molecular features of gastric cancer (GC) with SMARCA4 alterations. Methods results We screened alterations using immunohistochemistry on 1199 surgically resected GCs information Epstein–Barr virus (EBV), microsatellite instability (MSI) other SWI/SNF subunits. , SMARCA2 ARID1A mutations were investigated by targeted sequencing. The significance was determined statistical analysis. Twenty‐seven cases (2%) altered expression...

10.1111/his.14117 article EN Histopathology 2020-04-28

In a low-voltage electric distribution network, arc fault presents high energy density electricity-discharging phenomenon between conductors, which is often caused by aging of facilities, loose contacts and terminals, or insulation failure due to internal external destructions. A large amount heat may be created during this discharging, will further cause the risk fire hazards mitigate in residential environment. Currently, many utility grid operators electricity users are still devoted...

10.3390/en16031256 article EN cc-by Energies 2023-01-24

Power quality is a growing concern to both electric utilities and their customers. Among the commonly seen nonlinear loads, arc furnaces (EAFs) in steel plant play important roles that cause power disturbances. The characteristics of EAF generate significant harmonic currents flickers flowing through utility system. This paper presents analysis for with an ac load. Simulation results obtained by using Matlab/Simulink are then validated actual measuring data. It shown simulation model...

10.1109/pes.2006.1709471 article EN IEEE Power Engineering Society General Meeting, 2004. 2006-01-01

The introduction of electric vehicles in currently urban transportation system becomes tendency and attractive alternation to traditional fuel cars. Electric include certain different types are powered through vehicle chargers which elements an infrastructure that supplies energy for the recharging plug-in vehicles. There has been much more concern expressed over power quality issues caused by on low-voltage distribution systems. It is necessary know influence impact grid before operating...

10.1109/ichqp.2014.6842879 article EN 2014-05-01

The prognostic value of programmed death-ligand 1 (PD-L1) expression in nasopharyngeal carcinoma (NPC) is controversial, with previous studies showing conflicting results. Most NPCs endemic areas are Epstein-Barr virus (EBV)-positive. Our aim was to evaluate the clinical significance PD-L1 EBV-positive NPC. We retrospectively analyzed on tumor cells (TCs) and immune (ICs) by immunohistochemistry 208 NPC patients who underwent radiotherapy (203 concurrent chemotherapy). percentages TCs ICs...

10.3390/cancers10100374 article EN Cancers 2018-10-09

This paper presents application experiences of real-time simulation (RTS) techniques for harmonic and flicker studies an industrial power system, where the system nonlinear loads are properly modeled. A PC-cluster-based parallel simulator is implemented under MATLAB/SIMULINK, studied consists ac electric arc furnace, dc motor-drive loads, static var compensator. Guidelines model partition solver settings RTS environment reported. In addition, most commonly used offline with variable-step...

10.1109/tie.2009.2037645 article EN IEEE Transactions on Industrial Electronics 2009-12-09

Abstract In this study, a light-driving bug zapper is presented for well controlling the diseases brought by insects, such as mosquitoes. order to have device efficient trap insect pests in off-grid areas, pulse width modulated light emitting diodes (PWM-LED) combined with solar power module are proposed and implemented. With specific PWM electric signals drive LED, it found that no matter what ability of catching insects or consumed efficiency can be enhanced thus. It demonstrated 40% UV...

10.1038/srep40074 article EN cc-by Scientific Reports 2017-01-06

Integration of renewable energy (RE) to electric grid has been paid more attentions in past decade; meanwhile, solar photovoltaic (PV) with fastest growing becomes the main stream than other resources. When PV power high penetration integrates into grid, it may lead system impacts that cannot disregard. In this paper, a stochastic analysis method is studied and applied assessment integrations on 11.4 kV distribution feeder serves as offshore wind turbine (WT) testing site Taiwan....

10.1109/icasi.2018.8394262 article EN 2018 IEEE International Conference on Applied System Invention (ICASI) 2018-04-01

PV hosting capacity (PVHC) analysis on a distribution system is an attractive technique that emerged in recent years for dealing with the planning tasks high-penetration integration. PVHC uses various performance indices as judgements to find available amount of installation can be accommodated existing infrastructure without causing any violation. Generally, approaches assessments are implemented by iterative power flow calculations stochastic deployments so observe operation impacts...

10.3390/en13225942 article EN cc-by Energies 2020-11-13

Rationale: Hepatocellular carcinoma (HCC) is known to grow in a mosaic pattern, and it can sometimes be combined with non-hepatocellular cells. Despites the variety of combination, HCC significant neuroendocrine (NEC) component remains very rare. Most reported cases were treated as conventional relatively poor prognosis. Early diagnosis may lead better treatment modality. Here, we report case composite small cell (SCC) nodal metastasis SCC alone. Patient concerns: A 65-year-old man chronic...

10.1097/md.0000000000007868 article EN cc-by-nc Medicine 2017-08-01

With widespread non-linear loads and the increasing penetration of distributed generations in power system, harmonic pollution has become a great concern. The causes not only include integer harmonics, but also interharmonics, which exacerbate complexity analysis. In addition, output variability highly renewables such as electric arc furnaces photovoltaic solar or wind generation may lead to weakly time-varying harmonics interharmonics both frequency magnitude. These features present...

10.3390/app11020752 article EN cc-by Applied Sciences 2021-01-14

Field measurements of voltage and current is the most effective way for characterizing electric response an EAF that describe nonlinear behavior AC loads. Sufficient measured information can be adopted to develop appropriate model. In this paper, two classic methods based on data, harmonic injections equivalent sources, load modeling are reviewed. For comparison, advanced actual recorded cubic spline interpolation radial basis function neural network (RBFNN), also proposed model load. A...

10.1109/pes.2008.4596506 article EN 2008-07-01

Photovoltaic inverter, that is in charge of electric power conversion, a critical component used solar photovoltaic systems. Many concerns are focused on the operation inverter due to worse designing may cause terrible influences safety, performance and grid interconnection characteristics IEEE SCC21 provides uniform standard, known as 1547 for considerations distributed resources with The standard focuses technical specifications includes general principles, response abnormal conditions,...

10.1109/pesgm.2014.6939471 article EN 2014-07-01

The conventional SAR controller for DLL applications is shown in this paper to have the problem of dead lock. With problem, DLLs adopting are useless because they will go unlocked forever face supply voltage and temperature variations. An improved proposed overcome then rescue

10.1109/iscas.2006.1693480 article EN 1993 IEEE International Symposium on Circuits and Systems 2006-09-22

Toll-Like Receptor 9 (TLR9) stimulation selectively triggers the formation of a cell cluster termed intrahepatic myeloid aggregation for T expansion" (iMATE) in mouse chronic viral hepatitis model. iMATE expands cytotoxic cells and controls infection. The liver-specific immune response prompted this investigation whether effect could control tumor growth murine hepatic Murine BNL were used to establish an orthotropic liver We found that intravenous infusion TLR agonist, CpG...

10.1080/2162402x.2018.1502129 article EN DOAJ (DOAJ: Directory of Open Access Journals) 2018-12-14
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