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Enhanced thermoelectric composite performance from mesoporous carbon additives in a commercial Bi_(0.5)Sb_(1.5)Te_(3) matrix

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Journal of Materials Science & Technology 2021年第35期94卷 175-182页

作者： Seong-Tae Kim Jong Min Park Kwi-Il Park Sang-eun Chun Ho Seong Lee Pyuck-Pa choi Seonghoon Yi School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea

Composites were prepared,through hot pressing,using carbon materials with different pore size distributions as additives for commercial Bi_(0.5)Sb_(1.5)Te_(3) thermoelectric material(BST,p-type).Thermoelectric properties of the composites were measured in a temperature range of 298-473 *** conductivity of the composites,especially lattice thermal conductivity,was effectively decreased due to the mesoporous properties of the incorporated carbon *** electrical conductivity of the composites slightly decreased due to the electron scattering at the interface between the carbon material and the commercial BST *** composite with 0.2 vol.%mesoporous carbon powder(36%mesoporosity)exhibited a figure of merit value approximately 10.7%higher than that of commercial BST without *** behavior resulted in 116%improved output power in the composite block-based single element compared with a bare BST thermoelectric *** enhanced figure of merit was attributed to the effective reduction of lattice thermal conductivity by acoustic phonons scattering at the interface between the BST matrix and the mesoporous carbon as well as at the pore surfaces within the mesoporous *** utilizing mesoporous carbon materials used in this study,the shortcomings and economic difficulties of the composite process with low dimensional carbon additives(carbon nanotubes,graphene,and nanodiamond)can be overcome for extensive practical *** carbon powder with a tailored porosity distribution revealed the validity of bulk-type carbon additives to enhance the figure of merit of commercial thermoelectric materials.

关键词： Thermoelectric material Bi_(0.5)Sb_(1.5)Te_(3) Mesoporous carbon Lattice thermal conductivity Figure of merit

Purifying behavior of photocatalytic TiO_2 anodized in nitrate ion containing solution

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中国有色金属学会会刊：英文版 2009年第4期19卷 1027-1030页

作者： Jin-Wook choi Seong-eun LEE Byung-Gwan LEE Yong-Soo JEONG Han-Jun OH Choong-Soo CHI School of Advanced Materials Engineering Kookmin University Korea Institute of Materials Science Department of Materials Science Han seo University

Mesoporous titanium dioxide films were fabricated on titanium plates by micro-arc oxidation *** increase the photocatalytic activity of the films,NH4NO3 was added to the H2SO4 solution,and anodizing was carried out at high voltages using a DC power *** crystal structure,chemical composition,surface morphology and the optical property of the films were investigated by XPS,XRD,UV-VIS spectroscopy and *** photocatalytic activity of the films was evaluated by the decomposition of aniline blue,and the activity of the films for the degradation turned out to be improved by the additives to the electrolyte *** enhanced photocatalytic activity might result from the increased porosity and nitrate ion incorporation into the anodic films by micro arcing,and thereby the TiO2 layer might exhibit an improved absorption property for the visible light.

关键词：二氧化钛硝酸溶液盐离子催化行为氧化钛薄膜光催化活性 H2SO4溶液净化

Improvement of machining quality of copper-plated roll mold by controlling temperature variation

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Transactions of Nonferrous Metals Society of China 2011年第A01期21卷 37-41页

作者： Tae-Jin JE eun-Chae JEON Sang-Cheon PARK Doo-Sun choi Kyung-Hyun WHANG Myung-Chang KANG Division of Nano-Mechanical Systems Korea Institute of Machinery and Materials Daejeon 305-343 Korea National Core Research Center for Hybrid Materials Solution Pusan National University

Micro prism film used in LCD industry can be manufactured by roll to roll method with copper-plated roll mold. As copper-plated roll mold is getting larger, pitch error is getting severer. The pitch error drops the quality of micro prism film. The main cause of the pitch error was investigated during machining large roll mold whose machined length was 1 200 mm. The temperature of machining system was elevated during machining roll mold, and this elevation induced thermal expansion of the system. The temperature variation around the roll mold also made thermal expansion of the roll mold. The amount of thermal expansion had strong relationship to the amount of pitch error. Therefore, the roll mold was machined after warming-up of machining system and precise temperature controller around copper-plated roll mold was installed, which minimized the temperature variation. Finally, precise micro prism patterns without pitch error were machined on the large roll mold.

关键词： copper-plated roll mold machining prism pattern temperature variation

CORM-2-entrapped ultradeformable liposomes ameliorate acute skin inflammation in an ear edema model via effective CO delivery

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Acta Pharmaceutica Sinica B 2020年第12期10卷 2362-2373,2440页

作者： Gwan-Yeong Lee Alam Zeb eun-Hye Kim Beomseon Suh Young-Jun Shin Donghyun Kim Kyoung-Won Kim Yeong-Hwan Choe Ho-Ik choi Cheol-Ho Lee Omer Salman Qureshi In-Bo Han Sun-Young Chang ok-Nam Bae Jin-Ki Kim College of Pharmacy Institute of Pharmaceutical Science and TechnologyHanyang UniversityAnsan 15588Republic of Korea Riphah Institute of Pharmaceutical Sciences Riphah International UniversityIslamabad 44000Pakistan Department of Pharmacy Forman Christian CollegeLahore 54600Pakistan Department of Neurosurgery CHA Bundang Medical CenterSchool of MedicineCHA UniversitySeongnam 13496Republic of Korea College of Pharmacy Ajou UniversitySuwon 16499Republic of Korea

The short release half-life of carbon monoxide(CO)is a major obstacle to the effective therapeutic use of carbon monoxide-releasing molecule-2(CORM-2).The potential of CORM-2-entrapped ultradeformable liposomes(CORM-2-UDLs)to enhance the release half-life of CO and alleviate skin inflammation was investigated in the present ***-2-UDLs were prepared by using soy phosphatidylcholine to form lipid bilayers and Tween 80 as an edge *** deformability of CORM-2-UDLs was measured and compared with that of conventional liposomes by passing formulations through a filter device at a constant *** release profile of CO from CORM-2-UDLs was evaluated by myoglobin *** vitro and in vivo anti-inflammatory effects of CORM-2-UDLs were assessed in lipopolysaccharide-stimulated macrophages and TPA-induced ear edema model,*** deformability of the optimized CORM-2-UDLs was 2.3 times higher than conventional ***-2-UDLs significantly prolonged the release half-life of CO from 30 s in a CORM-2 solution to 21.6 ***-2-UDLs demonstrated in vitro anti-inflammatory activity by decreasing nitrite production and pro-inflammatory cytokine ***,CORM-2-UDLs successfully ameliorated skin inflammation by reducing ear edema,pathological scores,neutrophil accumulation,and inflammatory cytokines *** results demonstrate that CORM-2-UDLs could be used as promising therapeutics against acute skin inflammation.

关键词： Carbon monoxide CORM-2 Anti-inflammatory effect Ultradeformable liposomes Skin inflammation Ear edema

Pancreatic hardness: Correlation of surgeon's palpation, durometer measurement and preoperative magnetic resonance imaging features

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World Journal of Gastroenterology 2017年第11期23卷 2044-2051页

作者： Tae Ho Hong Joon-Il choi Michael Yong Park Sung eun Rha Young Joon Lee Young Kyoung You Moon Hyung choi Department of Surgery Seoul St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea Cancer Research Institute Seoul St.Mary’s HospitalCollege of Medicinethe Catholic University of Korea Department of Radiology Seoul St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea

AIM To evaluate the correlation between subjective assessments of pancreatic hardness based on the palpation, objective measurements using a durometer, and magnetic resonance imaging(MRI) findings for assessing pancreatic *** Eighty-three patients undergoing pancreatectomies were enrolled. An experienced surgeon subjectively evaluated the pancreatic hardness in the surgical field by palpation. The pancreatic hardness was also objectivelyevaluated using a durometer. Preoperative MRI findings were evaluated by a radiologist in terms of the apparent diffusion coefficient(ADC) values, the relative signal intensity decrease(RSID) of the pancreatic parenchyma, and the diameter of the pancreatic parenchyma and duct. Durometer measurement results, ADC values, RSID, pancreatic duct and parenchyma diameters, and the ratio of the diameters of the duct and parenchyma were compared between pancreases judged to be soft or hard pancreas on the palpation. A correlation analysis was also performed between the durometer and MRI *** The palpation assessment classified 44 patients as having a soft pancreas and 39 patients as having a hard pancreas. ADC values were significantly lower in the hard pancreas group. The ductal diameter and duct-to-pancreas ratio were significantly higher in the hard pancreas group. For durometer measurements, a correlation analysis showed a positive correlation with the ductal diameter and the duct-to-pancreas ratio and a negative correlation with ADC values. CONCLUSION Hard pancreases showed lower ADC values, a wider pancreatic duct diameter and a higher duct-to-pancreas ratio than soft pancreases. Additionally, the ADC values, diameter of the pancreatic duct and duct-to-pancreas ratio were closely correlated with the durometer results.

关键词： Pancreas Texture Hardness Magnetic resonance imaging Fistula

Helicobacter pylori and interleukin-8 in gastric cancer

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World Journal of Gastroenterology 2013年第45期19卷 8192-8202页

作者： Ko eun Lee Pham Ngoc Khoi Yong Xia Jung Sun Park Young eun Joo Kyung Keun Kim Seok Yong choi Young Do Jung Research Institute of Medical Sciences Chonnam National University Medical School Gwangju 501-190 South Korea

Helicobacter pylori(***)is a major etiological factor in the development of gastric ***-scale epidemiological studies have confirmed the strong association between *** infection and both cancer development and ***-8(IL-8)is overexpressed in gastric mucosa exposed to *** expression of IL-8 directly correlates with a poor prognosis in gastric ***-8 is *** addition to its potent chemotactic activity,it can induce proliferation and migration of cancer *** this review,we focus on recent insights into the mechanisms of IL-8 signaling associated with gastric *** relationship between IL-8 and *** is *** also summarize the current therapeutics against IL-8 in gastric cancer.

关键词： Helicobacter pylori Interleukin-8 Signals Gastric cancer Therapeutics

Prevalence of focal lamina cribrosa defects in eyes with pachychoroid disease spectrum

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International Journal of Ophthalmology(English edition) 2022年第1期15卷 77-82页

作者： Hae Min Kang Na eun Lee Jeong Hoon choi Hyoung Jun Koh Sung Chul Lee Harvard School of Public Health BostonMA 02115USA Catholic Kwandong University Incheon 22711Republic of Korea Gongdoek Seoul Eye Clinic Seoul 04214Republic of Korea choikang Seoul Eye Clinic Seoul 01110Republic of Korea Institute of Vision Research Department of OphthalmologyYonsei University College of MedicineSeoul 03722Republic of Korea Konyang University Hospital Daejeon 35365Republic of Korea

AIM:To determine the prevalence of focal lamina cribrosa(LC)defect among patients with pachychoroid disease spectrum(PDS)in the absence of peripapillary ***:This retrospective,cross-sectional study comprised of 180 patients with PDS,including polypoidal choroidal vasculopathy(PCV),central serous chorioretinopathy,and pachychoroidal *** records and optic ner ve head evaluations conducted using spectral-domain optical coherence tomography with enhanced depth imaging were *** a control group,236 patients who underwent ophthalmologic evaluation for vitreous floaters,without obvious ocular disease,were also ***:The mean age of the PDS group,which included 118 male patients(65.6%),was 57.4±11.1 *** was no significant difference between the two groups in age(P=0.710)or sex(P=0.248).Six patients(3.3%)in the PDS group and none in the control group showed focal LC defect(P=0.318).Among the six patients with focal LC defect in the PDS group,four eyes had PCV,one eye was the fellow eye of a PCV eye,and one eye had pachychoroidal ***:Focal LC defect can be defected in patients with PDS in the absence of peripapillar y ***,the prevalence of focal LC defect was not different significantly between PDS patients and those who did not have PDS.

关键词： central serous chorioretinopathy lamina cribrosa pachychoroid polypoidal choroidal vasculopathy

A conformal titanyl phosphate amorphous overlayer for enhancing photoelectrochemical hydrogen peroxide production

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Journal of Energy Chemistry 2023年第11期86卷 399-408,I0009页

作者： Jaekyum Kim Young eun Kim Minyeong Je Won Tae Hong Chang-Lyoul Lee Tae-Hoon Kim Sung Min Cho Chang Hyuck choi Heechae choi Woo-Seok Choe Jung Kyu Kim School of Chemical Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Theoretical Materials&Chemistry Group Institute of Inorganic ChemistryUniversity of CologneGreinstr.650939CologneGermany Advanced Photonics Research Institute(APRI) Gwangju Institute of Science and Technology(GIST)Gwangju 61005Republic of Korea Department of Materials Science and Engineering Chonnam National UniversityGwangju 61186Republic of Korea Department of Chemistry Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Institute for Convergence Research and Education in Advanced Technology(I-CREATE) Yonsei UniversitySeoul 03722Republic of Korea Department of Chemistry Xi’an Jiaotong-Liverpool UniversitySuzhou 215123JiangsuChina

Photoelectrochemical(PEC)H_(2)O_(2)production through water oxidation reaction(WOR)is a promising strategy,however,designing highly efficient and selective photoanode materials remains challenging due to competitive reaction ***,for highly enhanced PEC H_(2)O_(2)production,we present a conformal amorphous titanyl phosphate(a-TP)overlayer on nanoparticulate TiO_(2)surfaces,achieved via lysozyme-molded in-situ surface *** a-TP overlayer modulates surface adsorption energies for reaction intermediates,favoring WOR for H_(2)O_(2)production over the competing O_(2)evolution *** density functional theory calculations reveal that a-TP/TiO_(2)exhibits a substantial energy uphill for the O·*formation pathway,which disfavors O_(2)evolution but promotes H_(2)O_(2)***,the a-TP overlayer strengthens the built-in electric field,resulting in favorable ***,a-TP/TiO_(2)exhibits 3.7-fold higher Faraday efficiency(FE)of 63%at 1.76 V *** hydrogen electrode(RHE)under 1 sun illumination,compared to bare TiO_(2)(17%),representing the highest FE among TiO_(2)-based WOR H_(2)O_(2)production *** the a-TP overlayer constitutes a promising strategy for controlling reaction pathways and achieving efficient solar-to-chemical energy conversion.

关键词： Solar H_(2)O_(2) production In-situ surface reforming Titanyl phosphate Amorphous overlayer Reaction pathway control

Sectoral changes of the peripapillary choroidal thickness in patients with unilateral branch retinal vein occlusion

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International Journal of Ophthalmology(English edition) 2019年第3期12卷 472-479页

作者： Na eun Lee Hae Min Kang Jeong Hoon choi Hyoung Jun Koh Sung Chul Lee Department of Ophthalmology Catholic Kwandong University College of Medicine International St. Mary's Hospital choikang Seoul Eye Clinic Institute of Vision Research Department of Ophthalmology Yonsei University College of Medicine

AIM: To investigate sectoral changes in the mean peripapillary choroidal thickness(PCT) in patients with unilateral branch retinal vein occlusion(BRVO). METHODS: This retrospective, interventional study included 41 patients with acute, unilateral BRVO without macular edema. All patients completed at least a 6-month follow-up period. The PCT was measured at eight locations(temporal, superotemporal, superior, superonasal, nasal, inferonasal, inferior, and inferotemporal). In addition to calculating the average of all locations, the peripapillary choroidal area was divided into four sectors: superior(average of superotemporal PCT, superior PCT, and superonasal PCT), temporal, inferior(average of inferotemporal PCT, inferior PCT, and inferonasal PCT), and nasal. RESULTS: In the BRVO-affected eyes, the mean PCT was 177.7±69.8 μm(range, 70.1-396.0 μm) at baseline and 127.8±54.8 μm(range, 56.4-312.1 μm) at 6 mo(P<0.001). In the non-affected contralateral eyes, the mean PCT was 192.5±60.6 μm(range, 61.4-365.0 μm) at baseline and 165.9±61.1 μm(range, 56.8-326.8 μm) at 6 mo(P<0.001). In sectoral analysis, the mean PCT in each sector was significantly reduced in over 6 mo in the BRVO-affected eyes(all P<0.001). In the non-affected contralateral eyes, the mean PCT was not significantly changed in any sector over the 6-month follow-up period(superior sector, P=0.143; temporal sector, P=0.825; inferior sector, P=0.192; and nasal sector, P=0.599).CONCLUSION: Sectoral analysis shows that the mean PCTs in all sectors are reduced significantly over 6 mo in the BRVO-affected eyes, but not in the non-affected contralateral eyes.

关键词： branch retinal vein occlusion choroid choroidal thickness peripapillary choroidal thickness