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Frontiers in Energy 2023年第1期17卷 149-164页

作者： Shi JIN Long SHI sul ademi Yue ZHANG Fengge ZHANG School of Electrical Engineering Shenyang University of TechnologyShenyang 110870China Warwick Manufacturing Group University of WarwickCoventry CV47ALWarwickUK School of Electrical Engineering Shandong UniversityJinan 250061China

To improve the fault redundancy capability for the high reliability requirement of a brushless doubly-fed generation system applied to large offshore wind farms,the control winding of a brushless doubly-fed reluctance generator is designed as an open-winding ***,the two ends of the control winding are connected via dual three-phase converters for the emerging open-winding ***,a novel fault-tolerant control strategy based on the direct power control scheme is brought to focus in this *** on the direct power control(DPC)strategy,the post-fault voltage vector selection method is explained in detail according to the fault types of the dual *** fault-tolerant control strategy proposed enables the open-winding brushless doubly-fed reluctance generator(BDFRG)system to operate normally in one,two,or three switches fault of the converter,simultaneously achieving power tracking *** presented results verify the feasibility and validity of the scheme proposed.

关键词： open-winding brushless doubly-fed reluctance generator(BDFRG) direct power control faulttolerant control multi-level converter wind power

Brushless Doubly-Fed Machines:Opportunities and Challenges

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Chinese Journal of Electrical Engineering 2018年第2期4卷 1-17页

作者： Peng Han Ming Cheng sul ademi Milutin G.Jovanovic School of Electrical Engineering Southeast UniversityNanjing 210096China Warwick Manufacturing Group University of WarwickCoventryUK Faculty of Engineering and Environment Northumbria UniversityNewcastle upon TyneUK

The brushless doubly-fed machine(BDFM)is a family of multiport electric machines with two ac electrical ports and a common mechanical *** from the conventional singly-fed machines whose synchronous speed is solely determined by a single supply frequency and the actual pole pair number,the BDFM has two supply frequencies and two different pole pair numbers to control the rotor *** the two accessible electrical ports,all BDFMs are endowed with more degrees of freedom for speed and power control,inherent fault-tolerant capability and high *** BDFM in its broad sense has been extensively investigated as a promising alternative to the conventional slip-ring doubly-fed induction machine(DFIM)during the past decades,for both limited and wide speed range *** paper presents a new theoretical framework of the BDFM within which all topological variants can be closely linked by the similarities in working *** individualities of each machine topology are presented first,followed by the commonalities such as the modeling techniques,modes of operation,design considerations and control *** challenges are identified and highlighted based on recent developments and possible opportunities are predicted considering the unique nature of this special AC machine type.

关键词： Brushless doubly-fed machine multiport electric machine modeling techniques modes of operation design considerations control strategies

Imprinting at the KBTBD6 locus involves species-specific m ternal methylation and monoallelic expression in livestock animals

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Journal of Animal Science and Biotechnology 2024年第1期15卷 127-145页

作者： Jinsoo Ahn In-sul Hwang Mi-Ryung Park Seongsoo Hwang Kichoon Lee Department of Animal Sciences The Ohio State UniversityColumbusOH 43210USA Animal Biotechnology Division Rural Development AdministrationNational Institute of Animal ScienceJeonbuk 55365Republic of Korea Columbia Center for Translational Immunology Columbia University Irving Medical CenterColumbia UniversityNew YorkNY 10032USA Animal Welfare Research Team National Institute of Animal ScienceRDA1500Kongjwipatjwi‑roJeollabuk‑do 55365Republic of Korea

Background The primary differentially methylated regions(DMRs) which are maternally hypermethylated serve as imprinting control regions(ICRs) that drive monoallelic gene expression, and these ICRs have been investigated due to their implications in mammalian development. Although a subset of genes has been identified as imprinted, in-depth comparative approach needs to be developed for identification of species-specific imprinted genes. Here, we examined DNA methylation status and allelic expression at the KBTBD6 locus across species and tissues and explored potential mechanisms of *** Using whole-genome bisulfite sequencing and RNA-sequencing on parthenogenetic and normal porcine embryos, we identified a maternally hypermethylated DMR between the embryos at the KBTBD6 promoter Cp G island and paternal monoallelic expression of KBTBD6. Also, in analyzed domesticated mammals but not in humans, non-human primates and mice, the KBTBD6 promoter Cp G islands were methylated in oocytes and/or allelically methyl-ated in tissues, and monoallelic KBTBD6 expression was observed, indicating livestock-specific imprinting. Further analysis revealed that these Cp G islands were embedded within transcripts in porcine and bovine oocytes which coexisted with an active transcription mark and DNA methylation, implying the presence of transcription-dependent *** In this study, our comparative approach revealed an imprinted expression of the KBTBD6 gene in domesticated mammals, but not in humans, non-human primates, and mice which implicates species-specific evolution of genomic imprinting.

关键词： Differentially methylated region Domesticated mammal Imprinting KBTBD6 Parthenogenetic

Ex situ echo sounder target strengths of ice krill Euphausia crystallorophias

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Chinese Journal of Oceanology and Limnology 2015年第3期33卷 802-808页

作者： Hyoung sul LA Hyungbeen LEE Donhyug KANG SangHoon LEE Hyoung Chul SHIN Division of Polar Ocean Environment Research Korea Polar Research Institute Korea Institute of Ocean Science and Technology Maritime Security Research Center Korea Institute of Ocean Science and Technology

Ice krill is the keystone species in the neritic ecosystem in the Southern Ocean, where it replaces the more oceanic Antarctic krill. It is essential to understand the variation of target strength （TS in dB re l m^2） with the different body size to accurately estimate ice krill stocks. However, there is comparatively little knowledge of the acoustic backscatter of ice krill. The TS of individual, formalin-preserved, tethered ice krill was measured in a freshwater test tank at 38, 120, and 200 kHz with a calibrated split-beam echo sounder system. Mean TS was obtained from 21 individual ice krill with a broad range of body lengths （L： 13-36 iron）. The length （L, mm） to wet weight （W; mg） relationship for ice krill was 11/=0.001 21g^103~L35s （R2=0.96）. The mean TS-to-length relationship were TS38kHz=-177.4＋57log10（L）, （R^2=0.86）; TS120kHz= -129.9＋31.561ogf0（L）, （R2=0.87）; and TS200kHz=-117.6＋24.661ogre（L）, （R2=0.84）. Empirical estimates of the relationship between the TS and body length of ice krill were established at 38, 120, and 200 kHz and compared with predictions obtained from both the linear regression model of Greene et al. （1991） and the Stochastic Distorted Wave Born Approximation （SDWBA） model. This result might be applied to improve acoustic detection and density estimation of ice krill in the Southern Ocean. Further comparative studies are needed with in situ target strength including various body lengths of ice krill.

关键词： ice krill Euphausia crystallorophias ex situ target strength split-beam echo sounder

Redox Charge Transfer Kinetics and Reversibility of VO_(2) in Aqueous and Non-Aqueous Electrolytes of Na-Ion Storage

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Energy & Environmental Materials 2022年第4期5卷 1222-1228页

作者： sul Ki Park Kang Ho Shin Puritut Nakhanivej Harpalsinh H.Rana Ho Seok Park School of Chemical Engineering College of EngineeringSungkyunkwan University2066Seobu-roJangan-guSuwon-si Gyeonggi-do 440-746Republic of Korea Department of Engineering University of CambridgeCambridge CB30FSUK Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea

The deep understanding about the electrochemical behavior of the nanostructured electrode in electrolytes provides crucial insights for the rational design of electrode for sodium(Na)-ion storage system(NIS).Here,we report redox charge transfer kinetics and reversibility of VO_(2)(B) nanorod electrodes in both aqueous and organic electrolytes for *** assynthesized VO_(2)(B) nanorods show the reversible redox reaction with the higher specific and rate capacitances at high current density in aqueous electrolytes than in organic ***-dependent impedance measurements demonstrate the more facile interfacial charge transfer of Na ions into VO_(2)(B) nanorods in aqueous *** reversible evolution in oxidation state and chemical composition of VO_(2)(B) nanorods is observed in aqueous electrolytes,as confirmed by ex situ XRD and ex situ X-ray photoelectron spectroscopy *** by the facile and reversible pseudocapacitive feature,the electrochemical performances of VO_(2)(B) nanorods are further improved by constructing the hierarchical structure of the reduced graphene oxide-VO_(2) composite for aqueous Na+ion storage.

关键词： aqueous electrolyte energy storage mechanism hierarchical structure nanorod sodium ion storage

Evaluations of cytotoxicity of Smilax myosotiflora and its effects on sexual hormone levels and testicular histology in male rats

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Asian Pacific Journal of Tropical Biomedicine 2016年第3期6卷 246-250页

作者： Muhammad Hilmi Wan Norliza Ahmad Mohd Dasuki sul'ain School of Health Sciences Universiti Sains Malaysia Health Campus

Objective: To investigate the cytotoxicity of Smilax myosotiflora(S. myosotiflora)methanolic extract and its effects on sexual hormone levels and testicular histology in male ***: The cytotoxicity of S. myosotiflora methanolic extract was investigated by employing brine shrimp lethality assay. Forty eight male rats were randomly divided into four groups(Groups I–IV) of 12 each. Rats in Group I were administered with 0.5 m L of distilled water(vehicle), whilst Groups II, III and IV received 200, 400 and 800 mg/kg of the methanolic extract of S. myosotiflora in 0.5 m L of the vehicle, respectively. Male rats treated with continuous daily dosing were killed and necropsied after a total dose period of 60 days. Sexual hormones were assayed and histological examination of testes was performed according to standard ***: S. myosotiflora extracts did not produce any cytotoxicity to brine shrimp in all concentrations tested. Serum testosterone level was significantly higher in rats treated with high dose of S. myosotiflora. Testicular histology showed normal architecture with all stages of spermatogenesis in all experimental ***: The present work confirmed that S. myosotiflora extract improves reproductive functions, without any cytotoxic activity and produces no histological changes to the testes.

关键词： Smilax myosotiflora Cytotoxicity Sexual hormones Testicular histology

A Model Training Method for DDoS Detection Using CTGAN under 5GC Traffic

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Computer Systems Science & Engineering 2023年第10期47卷 1125-1147页

作者： Yea-sul Kim Ye-Eun Kim Hwankuk Kim Department of Electronics Information and System Engineering Sangmyung UniversityCheonan31066Korea Department of Information Security Engineering Sangmyung UniversityCheonan31066Korea

With the commercialization of 5th-generation mobile communications(5G)networks,a large-scale internet of things(IoT)environment is being *** is becoming increasingly crucial in 5G network environments due to the growing risk of various distributed denial of service(DDoS)attacks across vast IoT ***,research on automated intrusion detection using machine learning(ML)for 5G environments has been actively ***,5G traffic has insufficient data due to privacy protection problems and imbalance problems with significantly fewer attack *** this data is used to train an ML model,it will likely suffer from generalization errors due to not training enough different features on the attack ***,this paper aims to study a training method to mitigate the generalization error problem of the ML model that classifies IoT DDoS attacks even under conditions of insufficient and imbalanced 5G *** built a 5G testbed to construct a 5G dataset for training to solve the problem of insufficient *** solve the imbalance problem,synthetic minority oversampling technique(SMOTE)and generative adversarial network(GAN)-based conditional tabular GAN(CTGAN)of data augmentation were *** performance of the trained ML models was compared and meaningfully analyzed regarding the generalization error *** experimental results showed that CTGAN decreased the accuracy and f1-score compared to the ***,regarding the generalization error,the difference between the validation and test results was reduced by at least 1.7 and up to 22.88 times,indicating an improvement in the *** result suggests that the ML model training method that utilizes CTGANs to augment attack data for training data in the 5G environment mitigates the generalization error problem.

关键词： 5G core traffic machine learning SMOTE GAN-CTGAN IoT DDoS detection tabular form cyber security B5G mobile network security

Estimating the instantaneous reproduction number(R_(t))by using particle filter

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Infectious Disease Modelling 2023年第4期8卷 1002-1014页

作者： Yong sul Won Woo-Sik Son Sunhwa Choi Jong-Hoon Kim National Institute for Mathematical Sciences DaejeonSouth Korea International Vaccine Institute SeoulSouth Korea

Background:Monitoring the transmission of coronavirus disease 2019(COVID-19)requires accurate estimation of the effective reproduction number(Rt).However,existing methods for calculating Rt may yield biased estimates if important real-world factors,such as delays in confirmation,pre-symptomatic transmissions,or imperfect data observation,are not ***:To include real-world factors,we expanded the susceptible-exposed-infectiousrecovered(SEIR)model by incorporating pre-symptomatic(P)and asymptomatic(A)states,creating the SEPIAR *** utilizing both stochastic and deterministic versions of the model,and incorporating predetermined time series of Rt,we generated simulated datasets that simulate real-world challenges in estimating *** then compared the performance of our proposed particle filtering method for estimating Rt with the existing EpiEstim approach based on renewal ***:The particle filtering method accurately estimated Rt even in the presence of data with delays,pre-symptomatic transmission,and imperfect *** evaluating via the root mean square error(RMSE)metric,the performance of the particle filtering method was better in general and was comparable to the EpiEstim approach if perfectly deconvolved infection time series were provided,and substantially better when Rt exhibited short-term fluctuations and the data was right ***:The SEPIAR model,in conjunction with the particle filtering method,offers a reliable tool for predicting the transmission trend of COVID-19 and assessing the impact of intervention *** approach enables enhanced monitoring of COVID-19 transmission and can inform public health policies aimed at controlling the spread of the disease.

关键词： Particle filter Sequential Monte Carlo Effective reproduction number COVID-19 Transmission model Compartment model

Electrochemical and structural evolution of structured V_(2)O_(5) microspheres during Li-ion intercalation

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Journal of Energy Chemistry 2021年第4期30卷 108-113页

作者： sul Ki Park Puritut Nakhanivej Jeong Seok Yeon Kang Ho Shin Wesley M.Dose Michael De Voider Jin Bae Lee Hae Jin Kim Ho Seok Park School of Chemical Engineering Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea Institute for Manufacturing Department of EngineeringUniversity of CambridgeCambridge CB30FSUnited Kingdom Department of Chemistry University of CambridgeLensfield RoadCambridge CB21EWUnited Kingdom Research Center for Materials Analysis Korea Basic Science InstituteDaejeonRepublic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon440-746South Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746South Korea

With the development of stable alkali metal anodes,V_(2)O_(5) is gaining traction as a cathode material due to its high theoretical capacity and the ability to intercalate Li,Na and K ***,we report a method for synthesizing structured orthorhombic V_(2)O_(5) microspheres and investigate Li intercalation/deintercalation into this *** industry adoption,the electrochemical behavior of V_(2)O_(5) as well as structural and phase transformation attributing to Li intercalation reaction must be further *** synthesized V_(2)O_(5) microspheres consisted of small primary particles that were strongly joined together and exhibited good cycle stability and rate capability,triggered by reversible volume change and rapid Li ion *** addition,the reversibility of phase transformation(a,e,d,c and xLixV_(2)O_(5))and valence state evolution(5+,4+,and 3.5+)during intercalation/de-intercalation were studied via in-situ X-ray powder diffraction and X-ray absorption near edge structure analyses.

关键词： Lithium ion batteries Vanadium pentoxide(V2O5) In-situ analysis Phase transformation Intercalation/de-intercalation

Safety of acupotomy in a real-world setting:A prospective pilot and feasibility study

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Journal of Integrative Medicine 2022年第6期20卷 514-523页

作者： Sang-Hoon Yoon Chan-Young Kwon Hee-Geun Jo Jae-Uk sul Hyangsook Lee Jiyoon Won Su Jin Jeong Jun-Hwan Lee Jungtae Leem Chung-Yeon Korean Medicine Clinic Gangnam-guSeoul 06224Republic of Korea Department of Oriental Neuropsychiatry Dong-eui University College of Korean MedicineBusanjin-guBusan 47340Republic of Korea Department of Herbal Pharmacology College of Korean MedicineGachon University1342 Seongnamdae-roSujeong-guSeongnam 13120Republic of Korea Department of Korean Rehabilitation Medicine Dongshin University Korean Medicine HospitalGwangju 61619Republic of Korea Acupuncture and Meridian Science Research Center Kyung Hee UniversityDongdaemun-guSeoul 02447Republic of Korea Department of Science in Korean Medicine Graduate SchoolKyung Hee UniversityDongdaemun-guSeoul 02447Republic of Korea KM Science Research Division Korea Institute of Oriental MedicineDaejeon 34054Republic of Korea Department of Statistics Support Medical Science Research InstituteKyung Hee University Medical CenterDongdaemun-guSeoul 02447Republic of Korea Clinical Medicine Division Korea Institute of Oriental MedicineYuseong-guDaejeon 34054Republic of Korea Korean Medicine Life Science University of Science&Technology(UST)Campus of Korea Institute of Oriental MedicineYuseong-guDaejeon 34054Republic of Korea College of Korean Medicine Wonkwang UniversityIksanJeollabuk-do54538Republic of Korea

Objective:Acupotomy is a modern acupuncture method that includes modern surgical *** acupotomy is relatively more invasive than filiform acupuncture treatment,it is important to establish the safety profile of this *** justify further large-scale prospective observational studies,this preliminary study was performed to assess the feasibility of the approach and investigate the safety profile and factors potentially associated with adverse events(AEs).Methods:This was a prospective pilot study that assessed the feasibility of a large-scale forthcoming safety study on acupotomy treatment in a real-world *** feasibility(call response rate,dropout rate,response rate for each variable and recruitment per month)and safety profile(incidence,type,severity and causality of AEs,and factors potentially associated with AEs)were ***:A total of 28 participants joined the study from January to May 2018.A follow-up assessment was achieved in 258(1185 treatment points)out of 261 sessions(1214 treatment points).The response rate via telephone on the day after treatment was 87.3%.There were 8 systemic AEs in all the sessions(8/258;3.11%)and 27 local AEs on the total points treated(27/1185;2.28%).Severe AEs did not *** AE and local AE occurrence were associated with blade width and the number of needle stimulations per treatment ***:The findings suggest that it could be feasible to analyze the safety of acupotomy in a realworld ***,the primary data on some relevant AEs could be *** are planning large-scale prospective studies based on these *** registration:Clinical Research Information Service(CRIS)KCT0002849(https://***/cris/search/***/11487).

关键词： Acupotomy Acupuncture Safety Adverse effects Observational study Traditional Chinese medicine