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Triboelectric nanogenerators with gold-thin-film-coated conductive textile as floating electrode for scavenging wind energy

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Nano Research 2018年第1期11卷 101-113页

作者： Bhaskar Dudem dong Hyun kim jae Su Yu Department of Electronic Engineering Kyung Hee University 1732 Deogyeong-daero Giheung-gu Yongin-si Gyeonggi-do 446-701Republic of Korea

We report triboelectric nanogenerators （TENGs） composed of a flexible and cost-effective gold-coated conductive textile （CT） to convert wind energy into electricity. The Au-coated CT is employed because of its high surface roughness resulting from Au nanodots distributed on microsized fibers. Thus, the Au-coated CT with nano/microarchitecture plays an important role in enhancing the effective contact area as well as the output performance of the TENG. Moreover, the surface roughness of the Au-coated CT is controlled by adjusting the Au thermal deposition time or tailoring the diameter of the Au nanodots. At an applied wind speed of 10 m.s-1, a wind-based TENG （W-TENG） with dimensions of 75 mm × 12 mm ×25 mm produces an open-circuit voltage （Voc） of - 39 V and a short-circuit current （Isc） of - 3 A by using the airflow-induced vibrations of an optimized Au-coated CT between two flat polydimethylsiloxane （PDMS） layers. To further specify the device performance, the electric output of the W-TENG is analyzed by varying several parameters such as the distance between the PDMS layer and Au-coated CT, applied wind speed, external load resistance, and surface roughness of the PDMS layers. Introducing an inverse micropyramid architecture on the PDMS layers further improves the output performance of the W-TENG, which exhibits the highest Voc （- 49 V） and Isc （- 5μA） values at an applied wind speed of 6.8 m.s-1. Additionally, the reliability of the W-TENG is also tested by measuring its output current during long-term cyclic operation. Furthermore, the rectified output signals observed by the W-TENG device are used as a direct power source to light 45 green commercial light-emitting diodes connected in series and also to charge capacitors （100 and 4.7μF）. Finally, the output performance of the W-TENG device in an actual windy situation is also investigated.

关键词： triboelectric nanogenerators Au-coated conductivetextile polydimethylsiloxanelayer wind energy

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Destruction of methylphosphonic acid in a supercritical water oxidation bench-scale double wall reactor

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Journal of Environmental Sciences 2011年第4期23卷 545-552页

作者： Bambang Veriansyah Eun-Seok Song jae-Duck kim Supercritical Fluid Research Laboratory Korea Institute of Science and Technology (KIST) 39-1 Hawolgok-dong Seoungbuk-gu Seoul 136-791 Korea

The destruction of methylphosphonic acid （MPA）, a final product by hydrolysis/neutralization of organophosphorus agents such as sarin and VX （O-ethyl S-[2-（diisopropylamino）ethyl] methylphosphonothionate）, was investigated in a a bench-scale, continuous concentric vertical double wall reactor under supercritical water oxidation condition. The experiments were conducted at a temperature range of 450–600°C and a fixed pressure of 25 MPa. Hydrogen peroxide was used as an oxidant. The destruction efficiency （DE） was monitored by analyzing total organic carbon （TOC） and MPA concentrations using ion chromatography on the liquid effluent samples. The results showed that the DE of MPA up to 99.999% was achieved at a reaction temperature of 600°C, oxygen concentration of 113% storichiometric requirement, and reactor residence time of 8 sec. On the basis of the data derived from experiments, a global kinetic rate equation for the DE of MPA and DE of TOC were developed by nonlinear regression analysis. The model predictions agreed well with the experimental data.

关键词： supercritical water oxidation destruction efficiency methylphosphonic acid reaction kinetic nonlinear regression

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Immunostimulatory effect of ethanol extract of Chondracanthus tenellus in RAW 264.7 macrophages in vitro

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Asian Pacific Journal of Tropical Biomedicine 2021年第6期11卷 263-272页

作者： Cheol Park Da Hye Kwon Hyesook Lee Su Hyun Hong Gi-Young kim Hee-jae Cha do-Hyung kim Suhkmann kim Heui-Soo kim Hye-Jin Hwang Yung Hyun Choi Division of Basic Sciences College of Liberal StudiesDong-eui UniversityBusan 47340Republic of Korea Anti-Aging Research Center Dong-eui UniversityBusan 47340Republic of Korea Department of Biochemistry College of Korean MedicineDong-eui UniversityBusan 47227Republic of Korea Department of Marine Life Sciences School of Marine Biomedical SciencesJeju National UniversityJeju 63243Republic of Korea Department of Parasitology and Genetics College of MedicineKosin UniversityBusan 49104Republic of Korea Department of Aquatic Life Medicine College of Fisheries SciencePukyong National UniversityBusan 48513Republic of Korea Department of Chemistry College of Natural SciencesPusan National UniversityBusan 46241Republic of Korea Department of Biological Sciences College of Natural SciencesPusan National UniversityBusan 46241Republic of Korea Department of Food and Nutrition College of NursingHealthcare Sciences&Human EcologyDong-eui UniversityBusan 47340Republic of Korea

Objective:To investigate whether ethanol extracts of Chondracanthus tenellus(EECT)could improve immunomodulatory property of murine monocyte/macrophage RAW 264.7 ***:Cell viability,phagocytic ability,and nitric oxide were *** levels of prostaglandin E2 and cytokines were determined using enzyme-linked immunosorbent assay *** of immunoregulatory response protein was detected by Western blotting ***:As the concentration of EECT increased,the morphology of the cells changed to a typical active macrophage shape,and the phagocytic activity increased *** also effectively enhanced the production and secretion of immunomodulatory mediators,such as nitric oxide and prostaglandin E2,and *** addition,compared with the control group,EECT markedly stimulated the expression of Toll-like receptor 4(TLR4)and myeloid differentiation factor 88,one of the TLR4 adapter ***,EECT promoted the nucleus translocation of nuclear factor-kappa B(NF-κB)by increasing the phosphorylation and degradation of the inhibitor of NF-κB-α,indicating activation of the NF-κB signaling ***,similar trends were found in cells treated with lipopolysaccharide as a positive ***:Taken together,the results indicate that EECT has an immunomodulatory effect by increasing the production of immunomodulatory mediators and cytokines through activation of the TLR4/NF-κB signaling *** could be used as a potential candidate for medication or dietary supplements to increase immune activity.

关键词： Chondracanthus tenellus Immunomodulatory property TLR4 NF-κB

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Current approaches and future directions in the management of pterygium

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International Journal of Ophthalmology(English edition) 2018年第5期11卷 709-711页

作者： Kyoung Woo kim jae Chan kim Graduate School of Chung-Ang University College of Medicine Department of Ophthalmology College of MedicineChung-Ang University Hospital

Pterygium,a common ocular surface disorder,has a complex pathophysiology that may mimic *** is altered expression of cell cycle/proliferation-related factors in pterygium ***,similar to cancer treatments,the management of pterygium ought to be multifactorial based on the patient’s *** therapeutic methods for pterygium are focused on surgical resection in conjunction with antimetabolite use,in addition tissue graft is usually performed in the context of the avoidance of bare ***,future directions in the management of pterygia will likely focus on genetic *** perspective views the pathogenesis of pterygium,its existing therapies as well as current and future challenges in its treatment.

关键词： pterygium tumor recurrence future directions

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Survival improvement and prognostic factors in recent management of extrahepatic cholangiocarcinoma:A single-center study

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Hepatobiliary & Pancreatic Diseases International 2020年第2期19卷 153-156页

作者： Jung Wan Choe Hyo Jung kim jae Seon kim Division of Gastroenterology Department of Internal MedicineKorea University Ansan HospitalKorea University College of Medicine516 Gojan-dongDanwon-guAnsan-siGyeonggi-do15355Korea Division of Gastroenterology Department of Internal MedicineKorea University Guro HospitalKorea University College of Medicine148 Gurodong-roGuro-guSeoul 08308Korea

Background:Cholangiocarcinoma was considered as a dismal disease with very poor prognosis until *** is increasingly found due to increased life *** surgical and medical management were advanced recently,data on the prognosis,especially extrahepatic cholangio-carcinoma(ECC),were *** study aimed to identify clinicopathologic features and prognosis of patients with ***:Patients followed up and diagnosed with ECC between January 2014 and December 2016 at a tertiary hospital were included,whereas those with intrahepatic cholangiocarcinoma,gallbladder cancer,and ampullary cancer were ***:A total of 83 patients were followed after the treatment(49 men and 34 women;median age 73.3 years).Cancer location was classified as distal common bile duct(25 patients),proximal com-mon bile duct(24 patients),common hepatic duct(20 patients),and hilar(14 patients).About 14.5%of patients had history of another malignant neoplasm,and 24.1%patients had chronic ***-cal resection was performed in 54 patients(65%)and dysplasia was combined in 63%(34/54).Adjuvant chemotherapy was performed in 54%(29/54),but only 7 underwent palliative chemotherapy in 29 non-surgical *** median overall survival in all patients was 30.9 *** analyzing the treatment modality,median survival of adjuvant chemotherapy,surgery only,palliative chemotherapy,and support-ive care groups were 42.9,30.9,12.0,and 8.9 months,respectively(P<0.05).In the Cox regression analy-sis of survival,age,surgical resection,chemotherapy,and comorbidity were significant prognostic factors,and the comorbidity was the only significant prognostic factor in the multivariable analysis(hazard ratio[HR]=2.80;95%CI:1.32–5.95;P=0.007).In a subgroup analysis of surgical patients,the presence of dysplasia was a favorable prognostic factor in the multivariable analysis(HR=0.29;95%CI:0.09–0.91;P=0.033).Conclusions:The overall survival of patients with ECC wa

关键词： Cholangiocarcinoma Survival Prognosis

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Innovative strategies toward challenges in PV-powered electrochemical CO_(2)reduction

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Journal of Energy Chemistry 2021年第9期30卷 410-416页

作者： Siraj Sultan Jin Hyun kim Seung Hyeon kim Youngkook Kwon jae Sung Lee Department of Energy Engineering School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919South Korea

The solar energy-driven electrochemical CO_(2)reduction to value-added fuels or chemicals is considered as an attractive path to store renewable energy in the form of chemical energy to close the carbon ***,CO_(2)reduction suffers from a number of challenges including slow reaction rates,low selectivity,and low energy conversion ***,innovative strategies have been developed to mitigate this *** the development of flow cell reactors with a gas diffusion electrode,ionic liquid electrolytes,and new electrocatalysts have dramatically improved the reaction rates and selectivity to desired *** this perspective,we highlight the key recent developments and challenges in PVpowered electrochemical CO_(2)reduction and propose effective strategies to improve the reaction kinetics,to minimize the electrical energy losses,and to tune the selectivity of the catalysts for desired products,and then suggest future direction of research and development.

关键词： Electrochemical CO_(2)reduction Photovoltaic cell Ionic liquid electrolytes Flow cell electrolyzers Gas diffusion electrode

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Histogram equalization using a reduced feature set of background speakers' utterances for speaker recognition

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Frontiers of Information Technology & Electronic Engineering 2017年第5期18卷 738-750页

作者： Myung-jae kim Il-ho YANG Min-seok kim Ha-jin YU School of Computer Science University of Seoul

We propose a method for histogram equalization using supplement sets to improve the performance of speaker recognition when the training and test utterances are very short. The supplement sets are derived using outputs of selection or clustering algorithms from the background speakers' utterances. The proposed approach is used as a feature normalization method for building histograms when there are insufficient input utterance *** addition, the proposed method is used as an i-vector normalization method in an i-vector-based probabilistic linear discriminant analysis(PLDA) system, which is the current state-of-the-art for speaker verification. The ranks of sample values for histogram equalization are estimated in ascending order from both the input utterances and the supplement set. New ranks are obtained by computing the sum of different kinds of ranks. Subsequently, the proposed method determines the cumulative distribution function of the test utterance using the newly defined ranks. The proposed method is compared with conventional feature normalization methods, such as cepstral mean normalization(CMN), cepstral mean and variance normalization(MVN), histogram equalization(HEQ), and the European Telecommunications Standards Institute(ETSI) advanced front-end methods. In addition, performance is compared for a case in which the greedy selection algorithm is used with fuzzy C-means and K-means *** YOHO and Electronics and Telecommunications Research Institute(ETRI) databases are used in an evaluation in the feature space. The test sets are simulated by the Opus Vo IP codec. We also use the 2008 National Institute of Standards and Technology(NIST) speaker recognition evaluation(SRE) corpus for the i-vector system. The results of the experimental evaluation demonstrate that the average system performance is improved when the proposed method is used, compared to the conventional feature normalization methods.

关键词： Speaker recognition Histogram equalization i-vector

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Electrochemical characteristics of Al-Mg and Al-Mg-Si alloy in sea water

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中国有色金属学会会刊：英文版 2012年第S3期22卷 881-886页

作者： Seong-jong kim Seung-jun LEE jae-yong JEONG Kyu-hwan kim Division of Marine Engineering Mokpo Maritime University

Among Al alloys,particularly 5000 series Al Mg and 6000 series Al Mg Si often used as marine materials have excellent corrosion resistance,low melting point,and thereby showing recycling availability when compared to other *** experiments were conducted to select the most suitable material for marine *** electrochemical experiments were conducted in natural *** corrosion test was performed in many methods such as anodic/cathodic polarization and Tafel analysis using multi-channel potentio/galvanostat WMPG *** results,anodic and cathodic polarization behaviors indicate the characteristics of passive state and concentration polarization by reduction reaction in dissolved oxygen,which shows excellent electrochemical *** analysis results show no significant difference but 5052-O alloy of various alloy materials indicates the lowest corrosion current ***,5052-O Al alloy presents most anti-corrosion material in marine environment.

关键词： Al alloy ship electrochemical characteristics corrosion

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Multi-stage optimum design of magazine type automatic tool changer arm

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Journal of Central South University 2012年第1期19卷 174-178页

作者： kim jae-Hyun LEE Choon-Man School of Mechatronics Changwon National UniversityChangwon 641-773Korea

To enhance machining efficiency,tool change time has to be ***,for an automatic tool changer attached to a machining center,the tool change time is to be *** the automatic tool changer is a main part of the machining center as a driving *** static attributes of the automatic tool changer using the commercial code,ANSYS Workbench V12,were tried to *** the optimum design of automatic tool changer arm was proposed by performing the multi-stage optimum *** shape optimization of the automatic tool changer was proposed and the result was verified to obtain acceptable *** is possible to obtain an optimized model in which the maximum deformation,maximum stress,and mass are reduced by 10.46%,12.89% and 9.26%,respectively,compared with those of the initial ***,the results between conventional method by the design of experiments and proposed method by the multi-stage optimum design method were compared.

关键词： automatic tool changer optimum design structural analysis exchange arm

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Study for the Gas Flow through a Critical Nozzle

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Journal of Thermal Science 2003年第3期12卷 250-254,259页

作者： jae-Hyung kim Heuy-dong kim Shigeru Matsuo Toshiaki Setoguchi School of Mechanical Engineering Andong National UniversityAndong 760-749 KoreaSchool of Mechanical Engineering Andong National UniversityAndong 760-749 KoreaDepartment of Mechanical Engineering Saga University1 Honjo Saga 840-8502 JapanDepartment of Mechanical Engineering Saga University1 Honjo Saga 840-8502 Japan

In the present study, computational work using the axisymmetric, compressible, Navier-Stokes equations is carried out to predict the discharge coefficient and critical pressure ratio of gas flow through a critical nozzle. The Reynolds number effects are investigated with several nozzles with different throat diameter. Diffuser angle is varied to investigate the effects on the discharge coefficient and critical pressure ratio. The computational results are compared with the previous experimental ones. It is known that the discharge coefficient and critical pressure ratio are given by functions of the Reynolds number and boundary layer integral properties. It is also found that diffuser angle affects the critical pressure ratio.

关键词： compressible flow choke boundary layer critical pressure ratio discharge coefficient

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