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Submillimeter wave communication versus millimeter wave communication

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Digital Communications and Networks 2020年第1期6卷 64-74页

作者： Madhuprana Goswami hyuck M.kwon Department of Electrical Engineering and Computer Science Wichita State University1845 N.FairmountWichitaKS67260USA

This paper studies the performance of a submillimeter wave antenna operating between frequencies 0.1 THz and 10 THz with a 4-cyano-4-pentylbiphenyl[5CB]*** the size and shape of the antenna impact its gain/directivity,resonant frequency,bandwidth,and efficiency,the two antenna types considered in this paper are:(a)Rectangular Patch Antenna(RPA),and(b)Cylindrical Dielectric Resonator Antenna(CDRA).Here a submillimeter wave antenna is compared with a millimeter wave(a few GHz to 100 GHz)*** popular mmwave antennas are chosen for the submillimeter wave antenna in order to understand changes in their performance as the result of changes in their geometrical *** bei Korpern mit beliebiger Oberflache(FEKO)software is used for the design and calculation of the Three-Dimensional(3D)ElectroMagnetic(EM)*** paper also concentrates on the design and analysis of a massive submillimeter wave Multiple-Input Multiple-Output(MIMO)(8 by 8)RPA and CDRA.

关键词： Submillimeter wave antenna Millimeter wave antenna Rectangular micro-strip patch antenna Cylindrical dielectric resonator antenna Massive submillimeter wave MIMO antenna Applications

A Continuous Current Model of Accumulation Mode(Junctionless)Cylindrical Surrounding-Gate Nanowire MOSFETs

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Chinese Physics Letters 2013年第3期30卷 190-193页

作者： JIN Xiao-Shi LIU Xi kwon hyuck-In LEE Jong-Ho School of Information Science and Engineering Shenyang University of TechnologyShenyang 110023 School of Electrical and Electronics Engineering Chung-Ang UniversitySeoul 156-756Korea School of EECS Engineering and ISRC(Inter-University Semiconductor Research Center) Seoul National UniversityShinlim-DongKwanak-GuSeoul 151-742Korea

A continuous current model of accumulation mode or so-called junctionless(JL)cylindrical surrounding-gate Si Nanowire metal-oxide-silicon field effect transistors(MOSFETs)is *** model is based on an approximated solution of Poisson's equation considering both body doping and mobile charge *** is verified by comparing with three-dimensional simulation results using SILVACO Atlas TCAD which shows good *** any empirical fitting parameters,the proposed continuous current model of JL SRG MOSFETs is valid for all the operation regions.

关键词： MOSFETs TCAD cylindrical

Acetylacetone-TiO_(2) Promoted Large Area Compatible Cascade Electron Transport Bilayer for Efficient Perovskite Solar Cells

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Energy & Environmental Materials 2024年第2期7卷 221-228页

作者： Hyong joon Lee Jin Kyoung Park Jin hyuck Heo Sang Hyuk Im Department of Chemical and Biological Engineering Korea University145 Anam-ro Seongbuk-guSeoul 17104Korea

In designing efficient perovskite solar cells(PSCs),the selection of suitable electron transport layers(ETLs)is critical to the final device performance as they determine the driving force for selective charge ***_(2)nanoparticles(NPs)based ETLs have been a popular choice for PSCs due to superior electron mobility,but their relatively deep-lying conduction band energy levels(ECB)result in substantial potential ***,TiO_(2)NPs establish favorable band alignment owing to shallower ECB,but their low intrinsic mobility and abundant surface trap sites impede the final *** this reason,constructing a cascaded bilayer ETL is highly desirable for efficient PSCs,as it can rearrange energy levels and exploit on advantages of an individual *** this study,we prepare SnO_(2)NPs and acetylacetone-modified TiO_(2)(Acac-TiO_(2))NPs and implement them as bilayer SnO_(2)/Acac-TiO_(2)(BST)ETL,to assemble cascaded energy band ***_(2)contributes to rapid charge carrier transport from high electron mobility while Acac-TiO_(2)minimizes band-offset and effectively suppresses interfacial ***,the optimized BST ETL generates synergistic influence and delivers power conversion efficiency(PCE)as high as 23.14%with open-circuit voltage(V_(oc))reaching 1.14 ***,the BST ETL is transferred to a large scale and the corresponding mini module demonstrates peak performance of 18.39%PCE from 25 cm^(2)aperture ***,the BST-based mini module exhibit excellent stability,maintaining 83.1%of its initial efficiency after 1000 h under simultaneous 1 Sun light-soaking and damp heat(85℃/RH 85%)environment.

关键词： acetylacetone large area perovskite solar cells TiO_(2)

Incorporation of Parameter Uncertainty into Spatial Interpolation Using Bayesian Trans-Gaussian Kriging

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Advances in Atmospheric Sciences 2015年第3期32卷 413-423页

作者： joon Jin SONG Soohyun kwon Gyu Won LEE Department of Statistical Science Baylor UniversityUSA Department of Astronomy and Atmospheric Sciences Research and Training Team for Future Creative Astrophysicists and Cosmologist Kyungpook National UniversityRepublic of Korea

Quantitative precipitation estimation （QPE） plays an important role in meteorological and hydrological ***-based telemetered rain gauges are widely used to collect precipitation *** interpolation methods are commonly employed to estimate precipitation fields covering non-observed *** is a simple and popular geostatistical interpolation method,but it has two known problems：uncertainty underestimation and violation of *** paper tackles these problems and seeks an optimal spatial interpolation for QPE in order to enhance spatial interpolation through appropriately assessing prediction uncertainty and fulfilling the required *** this end,several methods are tested：transformation,detrending,multiple spatial correlation functions,and Bayesian *** particular,we focus on a short-term and time-specific rather than a long-term and event-specific *** paper analyzes a stratiform rain event with an embedded convection linked to the passing monsoon front on the 23 August *** from a total of 100 automatic weather stations are used,and the rainfall intensities are calculated from the difference of 15 minute accumulated rainfall observed every 1 *** one-hour average rainfall intensity is then calculated to minimize the measurement random ***-validation is carried out for evaluating the interpolation methods at regional and local *** a result,transformation is found to play an important role in improving spatial interpolation and uncertainty assessment,and Bayesian methods generally outperform traditional ones in terms of the criteria.

关键词： precipitation kriging transformation Bayesian kriging detrend Korea

Etching characteristics and surface modification of InGaSnO thin films under Cl_(2)/Ar plasma

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Plasma Science and Technology 2023年第10期25卷 91-96页

作者： Young-Hee JOO Jae-Won CHOI Bo HOU hyuck-In kwon Doo-Seung UM Chang-Il KIM Department of Electronic and Electrical Engineering Chung-Ang UniversitySeoul 06974Republic of Korea Department of Firearms and Optics Daeduk UniversityDaejeon 34111Republic of Korea School of Physics and Astronomy Cardiff UniversityCardiff CF243AAUnited Kingdom Department of Electrical Engineering Sejong UniversitySeoul 05006Republic of Korea

Indium gallium tin oxide(IGTO)thin films have the potential for high mobility and lowtemperature processing,which makes them suitable for applications such as display backplanes and high-voltage switching ***,very few studies have investigated the plasmaetching characteristics of IGTO and changes in its properties after *** this study,the etching characteristics of IGTO were investigated using Cl_(2)/Ar plasma,and changes in surface properties were *** showed that the etch rate increased with an increase in the proportion of Cl_(2),with the highest etch rate observed at 69 nm min^(-1)in pure Cl_(2)plasma with a gas flow rate of 100 ***,increased radio-frequency power caused a rise in the etch rate,while a process pressure of 15 m Torr was *** primary etching mechanism for IGTO thin films under Cl_(2)plasma was a chemical reaction,and an increased work function indicated the occurrence of defects on the *** addition,the etching process reduced the surface roughness of Cl_(2)-containing plasma,whereas the etching process in pure Ar plasma increased surface *** study contributes to a better understanding of the plasmaetching characteristics of IGTO and changes in its properties after etching,providing valuable insights for IGTO-based applications.

关键词： InGaSnO Cl2-based plasma etching mechanism surface modification plasma etching

A metallic anti-biofouling surface with a hierarchical topography containing nanostructures on curved micro-riblets

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Microsystems & Nanoengineering 2022年第1期8卷 83-96页

作者： Taekyung Kim Sunmok kwon Jeehyeon Lee joon Sang Lee Shinill Kang National Center for Optically-assisted high precision Mechanical Systems Yonsei UniversitySeoul 03722Korea School of Mechanical Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Korea

Metallic surface finishes have been used in the anti-biofouling,but it is very difficult to produce surfaces with hierarchically ordered *** the present study,anti-biofouling metallic surfaces with nanostructures superimposed on curved micro-riblets were produced via top-down *** to the attachment theory,these surfaces feature few attachment points for organisms,the nanostructures prevent the attachment of bacteria and algal zoospores,while the micro-riblets prohibit the settlement of *** oxidation was performed to induce *** forms a hydration layer on the surface,which physically blocks foulant adsorption along with the anti-biofouling *** characterized the surfaces via scanning electron and atomic force microscopy,contact-angle measurement,and wear-resistance *** contact angle of the hierarchical structures was less than 1°.Laboratory settlement assays verified that bacterial attachment was dramatically reduced by the nanostructures and/or the hydration layer,attributable to *** micro-riblets prohibited the settlement of *** 77 days of static immersion in the sea during summer,the metallic surface showed significantly less biofouling compared to a surface painted with an anticorrosive coating.

关键词： Anti-biofouling Superhydrophilic Hierarchical topography Metallic engineered surface Nanoimprinting,static immersion test,field trials

Influences of etiology and endoscopic appearance on the long-term outcomes of gastric antral vascular ectasia

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World Journal of Clinical Cases 2022年第18期10卷 6050-6059页

作者： Hyo Jin kwon Si Hyung Lee joon Hyun Cho Division of Gastroenterology and Hepatology Department of Internal MedicineYeungnam University College of MedicineDaegu 42415South Korea

BACKGROUND Gastric antral vascular ectasia(GAVE)has diverse associations and presumed causes,which include liver cirrhosis,chronic kidney disease,and autoimmune *** heterogeneity of underlying disorders suggests that the pathogenesis of GAVE may be *** To compare the clinical features and long-term outcomes of GAVE according to endoscopic patterns and *** The medical records and endoscopic images of 23 consecutive patients diagnosed with GAVE by endoscopy at Yeungnam University Hospital from January 2006 to December 2020 were retrospectively *** were allocated to cirrhosis(16 patients)and non-cirrhosis groups(7 patients).GAVE subtypes,as determined by endoscopy,were categorized as punctate(a diffuse,honeycomb-like appearance,17 patients)or striped(a linear,watermelon-like appearance,6 patients).RESULTS All GAVE patients with cirrhosis(16/16,100%)had a punctate pattern by endoscopy,whereas the majority of patients(6/7,85.7%)without cirrhosis had a striped pattern(P<0.001).Overt GAVE bleeding(10/23,43%)was significantly more common in the non-cirrhosis group than in the cirrhosis group(6/7,85.7%vs 4/16,25.0%;P=0.019),and more common in the striped group than in the punctate group(5/6,83.3%vs 5/17,29.4%;P=0.052).However,mean numbers of admissions due to GAVE bleeding and argon plasma coagulation(APC)sessions to address overt bleeding were similar in the cirrhosis and non-cirrhosis groups and in the punctate and striped *** patients with GAVE bleeding were successfully treated by APC,and no patient died from GAVE-related blood loss during a median follow-up of 24 *** Punctate-type GAVE is strongly associated with liver cirrhosis,and GAVE patients without cirrhosis tend to be more prone to overt ***,the presence of cirrhosis and endoscopic patterns did not influence long-term clinical courses or outcomes in cases of overt bleeding.

关键词： Gastric antral vascular ectasia Cirrhosis Endoscopy Gastrointestinal bleeding Argon plasma coagulation

Serum prostate-specific antigen as a predictor of prostate volume and lower urinary tract symptoms in acommunity-based cohort： a large-scale Korean screening study

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Asian Journal of Andrology 2013年第2期15卷 249-253,I0008页

作者： Dong Soo Park Jong Jin Oh Jae Yup Hong Young kwon Hong Don Kyung Choi In hyuck Gong Jin HoHwang Sung Won kwon Department of Urology CHA Bundang Medical Center CHA University Seongnam 463-712 Korea CHA Cancer Research Center Seou1135-081 Korea Department of Urology CHA Gangnam Medical Center CHA University Seou1135-081 Korea Korea Prostate Health Council Seou1137-070 Korea

The aim of this study is to assess the ability of serum prostate-specific antigen （PSA） to predict prostate volume （PV） and lower urinary tract symptoms （LUTS） represented by the international prostate symptom score （IPSS）. From January 2001 to December 2011, data were collected from men who first enrolled in the Korean Prostate Health Council Screening Program. Patients with a serum PSA level of 10 ng ml^-1 or age 〈40 years were excluded. Accordingly, a total of 34 857 men were included in our study, and serum PSA, PV and the IPSS were estimated in all patients. Linear and age-adjusted multivariate logistic analyses were used to assess the potential association between PSA and PV or IPSS. The predictive value of PSA for estimating PV and IPSS was assessed based on the receiver operating characteristics-derived area under the curve （AUC）. The mean PV was 29.9 ml, mean PSA level was 1.49 ng ml^-1 and mean IPSS was 15.4. A significant relationship was shown between PSA and PV, and the IPSS and PSA were also significantly correlated after adjusting by age. The AUCs of PSA for predicting PV ~20 ml, 〉25 ml and 〉35 ml were 0.722, 0.728 and 0.779, respectively. The AUCs of PSA for predicting IPSS 〉 7, 〉 13 and 〉 19 were 0. 548, 0.536 and 0. 537, respectively. Serum PSA was a strong predictor of PV in a community-based cohort in a large-scale screening study. Although PSA was also significantly correlated with IPSS, predictive values of PSA for IPSS above the cutoff levels were not excellent. Further investigations are required to elucidate the exact interactions between PSA and LUTS and between PSA and PV in prospective controlled studies. Such studies may suggest how PSA can be used to clinically predict PV and the IPSS.

关键词： lower urinary tract symptoms (LUTS) prostate prostate-specific antigen (PSA) prostate volume (PV)

Implementation of an 8ch GbE Multiplexing Transponder

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光学学报 2003年第S1期23卷 651-652页

作者： joon Ki Lee Hyunjae Lee Yool kwon Electronics and Telecommunications Research Institute 161 Gajeong-dong Yuseong-gu Daejeon 305-350 KoreaElectronics and Telecommunications Research Institute 161 Gajeong-dong Yuseong-gu Daejeon 305-350 KoreaElectronics and Telecommunications Research Institute 161 Gajeong-dong Yuseong-gu Daejeon 305-350 Korea

We report the implementation of a transponder to transmit eight channels of a Gigabit Ethernet signal transparently in an Optical Transport Network(OTN). This transponder is based on framing technologies for Ethernet ... 详细信息

关键词： of on for OTN Implementation of an 8ch GbE Multiplexing Transponder into WDM