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A nanofilter composed of carbon nanotube-silver composites for virus removal and antibacterial activity improvement

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Journal of Environmental Sciences 2016年第4期28卷 275-283页

作者： Jun Pyo kim jae Ha kim Jieun kim Soo No Lee Han-Oh Park Nano Development Team Bioneer Corporation Daejeon 306-220 Republic of Korea

We have developed a new nanofilter using a carbon nanotube-silver composite material that is capable of efficiently removing waterborne viruses and *** nanofilter was subjected to plasma surface treatment to enhance its flow rate,which was improved by approximately 62%.Nanoscale pores were obtained by fabricating a carbon nanotube network and using nanoparticle fixation technology for the removal of *** pore size of the nanofilter was approximately 38 nm and the measured flow rate ranged from 21.0 to 97.2 L/（min·m^2）under a pressure of 1–6 kgf/cm^2 when the amount of loaded carbon nanotube-silver composite was 1.0 mg/cm^*** nanofilter was tested against Polio-,Noro-,and Coxsackie viruses using a sensitive real-time polymerase chain reaction assay to detect the presence of viral particles within the *** trace of viruses was found to flow through the nanofilter with carbon nanotube-silver composite loaded above 0.8 mg/cm^***,the surface of the filter has antibacterial properties to prevent bacterial clogging due to the presence of 20-nm silver nanoparticles,which were synthesized on the carbon nanotube surface.

关键词： Carbon nanotube Silver nanoparticle Virus removal Nanofilter Water purification

Physical Experiments to Investigate the Effects of Street Bottom Heating and Inflow Turbulence on Urban Street-Canyon Flow

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Advances in Atmospheric Sciences 2005年第2期22卷 230-237页

作者： jae-Jin kim Jong-Jin BAIK Climate Environment System Research Center Seoul National University Seoul 151-742 KoreaSchool of Earth and Environmental Sciences Seoul National University Seoul 151-742 Korea

The effects of street bottom heating and inflow turbulence on urbanstreet-canyon flow are experimentally investigated using a circulating water channel. Threeexperiments are carried out for a street canyon with a street aspect ratio of 1. Results from eachexperiment with bottom heating or inflow turbulence are compared with those without bottom heatingand appreciable inflow turbulence. It is demonstrated that street bottom heating or inflowturbulence increases the intensity of the canyon vortex. A possible explanation on how street bottomheating or inflow turbulence intensifies the canyon vortex is given from a fluid dynamicalviewpoint.

关键词： urban street-canyon flow street bottom heating inflow turbulence circulating water channel

Development of two-axis control index table driven by direct drive motors

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Journal of Central South University 2011年第6期18卷 1962-1968页

作者： kim jae-hyun LEE Choon-man School of Mechatronics Changwon National University

The stability and reliability of a tilting index table should be considered at the design stage. A design method for the lightweight and improvement of the stability of the structure in a tilting index table was proposed using a commercial analysis program, ANSYS Workbench 12, by analyzing the static-thermal characteristics of the developed high-accuracy tilting index table at its design stage. The results of the performed structural analysis show that the maximum stress is generated at the stock tail part. An optimum design for the stock tail part was carried out to reduce the maximum stress and deformation. Also, the design variables were determined by considering the support of the stock tail part for the C-axis body. In the comparison of the results before and after the optimization, the maximum deformation and stress are improved by 2.8% and 8%, respectively.

关键词： tilting index table structural analysis modal analysis thermal analysis optimum design

Prothrombin kringle-2, a mediator of microglial activation: new insight in Alzheimer’s disease pathogenesis

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Neural Regeneration Research 2022年第12期17卷 2675-2676页

作者： jae Man Lee Sang Ryong kim Department of Biochemistry and Cell Biology Cell and Matrix Research InstituteSchool of MedicineKyungpook National UniversityDaeguKorea Brain Science and Engineering Institute Kyungpook National UniversityDaeguKorea School of Life Sciences BK21 FOUR KNU Creative BioResearch GroupInstitute of Life Science and BiotechnologyKyungpook National UniversityDaeguKorea

Microglial activation in Alzheimer’s disease(AD):In 1907,*** Alzheimer,a Bavarian-born German psychiatrist and neuropathologist,published an article describing the clinical and neuropathological features of an unclassified psychiatric *** disorder was later named AD and is currently the most common brain disorder(Takata et al.,2021).AD involves the accumulation of amyloid-β(Aβ)and hyperphosphorylated tau proteins in the brain,which are associated with senile plaques and neurofibrillary tangles,respectively(Vergara et al.,2019;Takata et al.,2021).AD is characterized by cognitive impairment and memory loss with hippocampal neurodegeneration(kim et al.,2021).

关键词： Alzheimer Aβ tau

Risk factors for complications associated with upper gastrointestinal foreign bodies

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World Journal of Gastroenterology 2015年第26期21卷 8125-8131页

作者： Kyong Hee Hong Yoon jae kim jae Hak kim Song Wook Chun Hee Man kim jae Hee Cho Division of Gastroenterology Department of Internal MedicineDongguk University Ilsan HospitalGraduate School Division of Gastroenterology Department of Internal MedicineGachon University Gil Medical Center Division of Gastroenterology Department of Internal MedicineMyongji Hospital Division of Gastroenterology and Hepatology Department of Internal MedicineYonsei University Wonju College of Medicine

AIM: To investigate predictive risk factors associated with complications in the endoscopic removal of foreign bodies from the upper gastrointestinal ***: We retrospectively reviewed the medical records of 194 patients with a diagnosis of foreign body impaction in the upper gastrointestinal tract,confirmed by endoscopy,at two university hospital in South *** demographic data,including age,gender,intention to ingestion,symptoms at admission,and comorbidities,were *** features of the foreign bodies,such as type,size,sharpness of edges,number,and location,were *** data those were analyzed included duration of foreign body impaction,duration of endoscopic performance,endoscopic device,days of hospitalization,complication rate,30-d mortality rate,and the number of operationsrelated to foreign body ***: The types of upper gastrointestinal foreign bodies included fish bones,drugs,shells,meat,metal,and animal *** locations of impacted foreign bodies were the upper esophagus(57.2%),mid esophagus(28.4%),stomach(10.8%),and lower esophagus(3.6%).The median size of the foreign bodies was 26.2 ± 16.7 *** 194 patients,endoscopic removal was achieved in 189,and complications developed in 51 patients(26.9%).Significant complications associated with foreign body impaction and removal included deep lacerations with minor bleeding(n = 31,16%),ulcer(n = 11,5.7%),perforation(n = 3,1.5%),and abscess(n = 1,0.5%).Four patients underwent operations because of incomplete endoscopic foreign body *** multivariate analyses,risk factors for endoscopic complications and failure were sharpness(HR = 2.48,95%CI: 1.07-5.72; P = 0.034) and a greater than 12-h duration of impaction(HR = 2.42,95%CI: 1.12-5.25,P = 0.025).CONCLUSION: In cases of longer than 12 h since foreign body ingestion or sharp-pointed objects,rapid endoscopic intervention should be provided in patients with ingested foreign bodies.

关键词： Emergency department Foreign body Upper gastrointestinal tract Endoscopy Complication

Fournier’s gangrene after insertion of thermo-expandable prostatic stent for benign prostatic hyperplasia:A case report

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World Journal of Clinical Cases 2023年第27期11卷 6498-6504页

作者： Hee Chang Jung yeong Uk kim Department of Urology Yeungnam University College of MedicineDaegu 42415South Korea

BACKGROUND Thermo-expandable urethral stent(Memokath 028)implantation is an alternative treatment for older patients with lower urinary tract symptoms and benign prostatic *** prostatic urethral stent implantation,minor complications such as urinary tract infection,irritative symptoms,gross hematuria,and urethral pain have been observed;however,there are no reports of life-threatening ***,we report a critical case of Fournier’s gangrene that occurred 7 years after prostatic *** SUMMARY An 81-years-old man with benign prostatic hyperplasia(volume,126 ccs;as measured by transrectal ultrasound)had undergone insertion of a thermoexpandable urethral stent(Memokath 028)as he was unfit for surgery under general ***,the patient had undergone a suprapubic cystostomy for recurrent acute urinary retention 4 years after the insertion of prostatic stent(Memokath 028).We had planned to remove the Memokath 028;however,the patient was lost to *** patient presented to the emergency department 3 years after the suprapubic cystostomy with necrotic changes from the right scrotum to the right inguinal *** digital rectal examination,tenderness and heat of prostate was ***,the black skin color change with foulsmelling from right scrotum to right inguinal area was *** computed tomography finding,subcutaneous emphysema was identified to same *** was diagnosed with Fournier’s gangrene based on the physical examination and computed tomography *** emergency room,Fournier’s gangrene severity index value is seven ***,he underwent emergent extended surgical debridement and removal of the Memokath ***-spectrum intravenous antibiotics were administered and additional necrotic tissue debridement was ***,the patient died 14 days after surgery due to multiorgan *** If Memokath 028 for benign prostatic hyperplasia is not working in older patients,its rapid

关键词： Urethral stents Minimally invasive surgery Complication Fournier’s gangrene Benign prostatic hyperplasia Case report

Hydrothermal decomposition of pentachlorophenol in subcritical and supercritical water with sodium hydroxide addition

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Journal of Environmental Sciences 2007年第6期19卷 663-666页

作者： PRABOWO Benedictus VERIANSYAH Bambang kim jae-Duck Supercritical Fluid Research Laboratory Korea Institute of Science and Technology(KIST)-Department of Green Process and System EngineeringUniversity of Science and Technology(UST)39-1 Hawolgok-dongSeoungbuk-gu Seoul136-791Korea.

Hydrothermal decomposition of pentachlorophenol （PCP, C6HC150）, as the probable human carcinogen, was investigated in a tubular reactor under subcritical and supercritical water with sodium hydroxide （NaOH） addition. The experiments were conducted at a temperature range of 30（0-420℃ and a fixed pressure of 25 MPa, with a residence time that ranged from 10 s to 70 s. Under the reaction conditions, the initial PCP concentrations were varied from 0.25 to 1.39 mmol/L, and the NaOH concentrations were varied from 2.5 to 25 times of the concentrations of PCP. The result of this study showed that PCP conversion in supercritical water was highly dependent on the reaction temperature, residence time, and NaOH concentration. PCP conversion in subcritical water is, however, only dependent on reaction temperature. NaOH concentration and residence times were found to have little effect on PCP conversion in subcritical condition. It was found that NaOH concentration affected the dechlorinations of PCP in the supercritical water. The intermediates detected were proposed to be tetrachlorophenol and trichlorophenol, respectively.

关键词： pentachlorophenol hydrothermal decomposition supercritical water suberitical water

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

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