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Journal of Advanced Ceramics 2013年第3期2卷 285-290页

作者： jong hyun kim Jung Rag YOON R&D Center Samwha Capacitor Co.Ltd.YonginGyeonggi 449-884R.O.Korea

The electrical characteristics of hybrid super capacitor were evaluated by synthesizing LTO(Li_(4)Ti_(5)O_(12))using TiO_(2) having a hydrogen titanate nanowire *** of the hydrogen titanate nanowire was implemented by using TiO_(2) having size of 60 nm and NaOH,and performing synthesis at 70℃for 6 h with a sonochemical *** compound was synthesized at 150℃for 36 h and at 180℃for 36 h respectively by using the hydrogen titanate nanowire and LiOH·H2O as starting materials with a hydrothermal *** final LTO compound was synthesized at 700℃for 6 h using a solid-state *** a result of manufacturing the hybrid super capacitor using LTO synthesized at 180℃for 36 h with the hydrothermal method,a capacity of 198 mA·h/g has been achieved compared to a theoretical capacity of 172 mA·h/g of existing LTO,and thus,the capacity has been increased by about 13%.Further,such excellent cycle performance has ensured its possibility as a high-capacity capacitor.

关键词： LTO(Li4Ti5O12) lithium titanate oxide hydrogen titanate nanowire hybrid super capacitor

Low-temperature crystalline lead-free piezoelectric thin films grown on 2D perovskite nanosheet for flexible electronic device applications

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Nano Research 2019年第10期12卷 2559-2567页

作者： jong-hyun kim Sang Hyo Kweon Sahn Nahm KU-KIST Graduate School of Converging Science and Technology Korea University145 Anam-roSeongbuk-guSeoul 02841Republic of Korea Department of Material Science and Engineering Korea University145 Anam-roSeongbuk-guSeoul 02841Republic of Korea Department of Mechanical Engineering Kobe University1-1 Rokkodai-choNadaKobe 657-8501Japan

A monolayer of Sr2Nb3Oio(SNO)is deposited on the Pt/Ti/SiCWSi(Pt?Si)or Pt/Ti/polyimide(Pt-Pl)substrate by using the Langmuir-Blodgett method and employed as a seed-layer for the growth of a crystalline(Nai_xKx)NbO3(NKN)film at 350℃.The crystalline NKN film is grown along the[001]direction on the SNO/Pt-Si(or SNO/Pt-PI)*** to the presence of oxygen vacancies in the SNO seed-layer,the NKN film exhibits low ferroelectric properties and large leakage *** ameliorate these properties,the SNO/Pt-Si substrate is annealed in a 50 Torr oxygen atmosphere at 300℃,which removes the oxygen ***,the NKN film deposited on this substrate exhibits promising electrical properties,namely a dielectric constant of 278,dissipation factor of 1.7%,a piezoelectric 8nstant of 175 pm`V^-1,and a leakage current density of 6.47 x 10^-7 A cm^-2 at-0.2 MV *** electrical properties are obtained from the NKN film grown on the flexible SNO/Pt-PI substrate at 350°***,the NKN films grown on the SNO seed-layer at 350°C can be applied to electronic devices with flexible polymer substrates.

关键词： lead-free piezoelectric thin films low-temperature-deposition process two-dimensional(2D)nanosheet seed-layers polymer substrates

Hyperreflective photonic crystals created by shearing colloidal dispersions at ultrahigh volume fraction

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Microsystems & Nanoengineering 2024年第1期10卷 161-173页

作者： Minji kim jong Bin kim Shin-hyun kim Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

Colloidal crystallization serves as one of the most economic and scalable production methods for photonic ***,insufficient optical performance,nonuniformity and low reproducibility remain challenges for advanced high-value *** this study,we optimally formulate a photocurable dispersion of silica particles and apply shear flow to unify the orientation of the colloidal crystals,ensuring high optical performance and *** silica particles experience strong repulsion at ultrahigh volume fractions of 50%but demonstrate low mobility,leading to polycrystalline *** shear flow to the dispersions allows the silica particles to rearrange into larger crystalline domains with a unidirectional orientation along the *** shear-induced structural change produces absolute reflectivity at the stopband as high as 90%and a high transparency of 90%at off-resonant wavelengths with minimal diffusive ***,the strong interparticle repulsion ensures a uniform volume fraction of particles throughout the dispersion,reducing deviations in the optical *** intricately micropattern the photocurable dispersions using ***,the photonic films and patterns can be stacked to form multiple layers,displaying mixed structural colors and multiple reflectance peaks without sacrificing *** superior photonic materials hold promise for various optical applications,including optical components and anticounterfeiting patches.

关键词： properties. dispersion reflectivity

Pancreatic metastasis of leiomyosarcoma in the right thigh:A case report

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World Journal of Gastroenterology 2007年第7期13卷 1135-1137页

作者： Yang Seok Koh Jung Chul Chol Kyoon Cho hyun jong kim Division of Hepatobiliary & Pantreatic Surgery Department of Surgery Chonnam National University Medical School Gwangju 501757 Korea

Pancreatic tumors are primary in most of the cases. Pancreatic metastases associated with other primary malignancies, especially pancreatic metastasis of leiomyosarcoma, are uncommon. A 66-year-old woman underwent surgical resection of malignant mesenchymoma （70% osteosarcoma and 30% leiomyosarcoma） in the right thigh. In the postoperative period, a pancreatic mass was identified radiologically by abdominal computed tomography. Pylorus-preserving pancreaticoduodenectomy was performed. The surgical specimen revealed leiomyosarcoma metastasized to the pancreas. A metastatic nodule on the remnant pancreatic tail was discovered 9 mo after the first pancreatic resection, and distal pancreatectomy was performed. Cases of pancreatic metastasis from leiomyosarcoma are extremely rare, especially when the tumor was resectable. We report here a unique case of pancreatic metastasis from a leiomyosarcoma in the dght thigh that had been treated surgically.

关键词： Pancreatic tumor Leiomyosarcoma Metastasis

BIOCOMPATIBILITY OF A PDMS-COATED MICRO-DEVICE:BLADDER VOLUME MONITORING SENSOR

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Chinese Journal of Polymer Science 2012年第2期30卷 242-249页

作者： Dong Sup Lee Su Jin kim Jun Ho Sohn In Gul kim Sae Woong kim Dong Wan Sohn jong hyun kim Bumkyoo Choi Department of Urology St.Vincent's HospitalCollege of Medicinethe Catholic University of KoreaSuwonKorea Department of Urology Seoul St.Mary's HospitalCollege of Medicinethe Catholic University of KoreaSeoulKorea Department of Urology Yeouido St.Mary's HospitalCollege of Medicinethe Catholic University of KoreaSeoulKorea Department of Mechanical Engineering Sogang UniversitySeoulKorea

We evaluated the biocompatibility of a dimethylpolysiloxane-coated micro-device which had been designed for monitoring real-time bladder volume in previous studies. The extract assay with dimethylpolysiloxane which had been used for coating the micro-device to measure the bladder volume was performed as an in vitro cytotoxicity test. For in vivo biocompatibility testing, the inflammatory responses around the implantation site of the micro-device in subcutaneous tissue of rat were assessed by light microscope with H＆E stain and fluorescence microscope with ED1 stain and von Willebrand factor stain. The averages of cell viability in dimethylpolysiloxane group were 84.6% and 82.3% at 24 h and 72 h incubation, respectively. The qualitative evaluations with light and fluorescence microscope revealed that the inflammatory changes peaked during 2 weeks but almost disappeared at 4 weeks after implantation of devices. The quantitative evaluations for granulation layer formation and neovascularization showed that the thickness of the layer in dimethylpolysiloxane group peaked during 2 weeks but it came to be stabilized at 4 weeks as thin as at 2 weeks in control group, and the frequency of neovascularization was higher in dimethylpolysiloxane group than in control group but it was not increased with time. The dimethylpolysiloxane-coated micro-device is thought be a reliable bio-medical device.

关键词： Dimethylpolysiloxane Devices Biocompatibility testing.

Undifferentiated embryonal sarcoma of the liver presenting as a hemorrhagic cystic tumor in an adult

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Hepatobiliary & Pancreatic Diseases International 2011年第6期10卷 657-660页

作者： Ho hyun kim Jung Chul kim Eun Kyu Park Young Hoe Hur Yang Seok Koh Chol Kyoon Cho hyung Seok kim hyun jong kim Department of Surgery Chonnam National University Medical School GwangjuKorea Department of Pathology Chonnam National University Medical School GwangjuKorea

BACKGROUND:Undifferentiated embryonal sarcoma (UES) of the liver is a rare,highly malignant neoplasm with a poor prognosis occurring almost exclusively in late childhood (6-10 years of age).Only a few cases have been reported in adults accounting for less than 1% of all primary liver ***:A 47-year-old woman presented with a palpable mass in the left upper *** resonance imaging revealed a 12×10 cm cystic mass with hemorrhage in the left lateral segment of the *** initial impression was a hemorrhagic cystic tumor of the *** patient underwent a left lateral sectionectomy of the *** and immunohistochemistry helped make a diagnosis of ***:The patient recovered uneventfully and received systemic *** examination for follow-up revealed a metastatic lesion in the lumbar spine (L5).She was subjected to radiotherapy at the lumbar *** survived 48 ***:Although hepatic cyst as UES of the liver is difficult to diagnose because of its rarity in adults and lack of specific findings,it should be considered in a differential diagnosis.

关键词： embryonal sarcoma liver neoplasms cyst adult

Seroepidemiology of echovirus 30 in Korean children

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World Journal of Pediatrics 2017年第6期13卷 611-614页

作者： Joo Young Lee Yumi Seo Ui Yoon Choi jong-hyun kim Jin Han Kang Department of Pediatrics College of MedicineThe Catholic University of KoreaSeoulRepublic of Korea

Background:Although aseptic meningitis associated with echovirus type 30 has emerged as a global public health concern,no data have been reported on children's immune status against echovirus type *** current study aimed to investigate the seropositivity among Korean children for antibodies against echovirus ***:Two hundred and fifty residual serum samples were collected at ***'s *** were categorized by age into four groups:group 1 (3 months-2 years),group 2 (3-6 years),group 3 (7-10 years) and group 4 (11-15 years).Neutralizing antibodies against echovirus 30 were ***:Seroprotective neutralizing antibodies against echovirus 30 were detected in 129 (49%) *** rates were 23%,48%,55% and 73% in groups 1-4,*** antibody titers,1:256-1:512 was the highest neutralizing antibody titer range in group 2,while 1:1024-1:2048 in group 3 and *** the seropositive individuals in group 3 and 4,6% and 12% had neutralizing antibody titers of 1:2048,***:The seropositivity rate increased significantly with age..The distribution of neutralizing antibody titers varied by age group,and higher ranges of neutralizing antibody titers were observed in higher age *** findings suggest high susceptibility to echovirus 30 infection in children younger than 2 years *** 30 infection in childhood may have contributed to increased neutralizing antibody titers with age.

关键词： echovirus 30 Korea seroepidemiology

Gender differences in adult traumatic brain injury according to the Glasgow coma scale:A multicenter descriptive study

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Chinese Journal of Traumatology 2021年第6期24卷 333-343页

作者： Ki Seong Eom Jang Hun kim Sang Hoon Yoon Seong-jong Lee Kyung-Jae Park Sung-Kon Ha Jin-gyu Choi Kwang-Wook Jo jongYeon kim Suk hyung Kang jong-hyun kim Department of Neurosurgery Institute of Wonkwang Medical ScienceWonkwang University School of MedicineIksanSouth Korea Department of Neurosurgery Armed Forces Capital HospitalSeongnamSouth Korea Department of Neurosurgery Armed Force HospitalYangjuSouth Korea Department of Neurosurgery Korea University Anam HospitalSeoulSouth Korea Department of Neurosurgery Korea University Ansan HospitalAnsanSouth Korea Department of Neurosurgery Yeouido St.Mary's HospitalCatholic UniversitySeoulSouth Korea Department of Neurosurgery Catholic University St.Mary's HospitalBucheonSouth Korea Department of Neurosurgery Wonju Severance Christian HospitalWonjuSouth Korea Department of Neurosurgery Hallym University Sacred Heart HospitalChuncheonSouth Korea Department of Neurosurgery Korea University Guro HospitalSeoulSouth Korea

Purpose:Patients’gender,which can be one of the most important determinants of traumatic brain injury(TBI)outcomes,is also likely to interact with many other outcome variables of *** multicenter descriptive study investigated gender differences in epidemiological,clinical,treatment,mortality,and variable characteristics in adult TBI ***:The selection criteria were defined as patients who had been diagnosed with TBI and were admitted to the hospital between January 1,2016 and December 31,2018.A total of 4468 adult TBI patients were enrolled at eight University *** on the list of enrolled patients,the medical records of the patients were reviewed and they were registered online at each *** registered patients were classified into three groups according to the Glasgow coma scale(GCS)score:mild(13-15),moderate(9-12),and severe(3-8),and the differences between men and women in each group were *** risk factors of moderated and severe TBI compared to mild TBI were also ***:The study included 3075 men and 1393 women and the proportion of total males was 68.8%.Among all the TBI patients,there were significant differences between men and women in age,past history,and GCS *** the mild and severe TBI groups showed significant differences in age,past history,and clinical symptoms,the moderate TBI group showed significant differences in age,past history,cause of justice,and ***:To the best of our knowledge,this multicenter study is the first to focus on gender differences of adult patients with TBI in *** study shows significant differences between men and women in many aspects of adult ***,gender differences should be strongly considered in TBI studies.

关键词： Traumatic brain injuries Gender Epidemiology Glasgow coma scale

Chemical and mechanical properties of stainless, environment-friendly, and nonflammable Mg alloys (SEN alloys): A review

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Journal of Magnesium and Alloys 2024年第3期12卷 841-872页

作者： jong Un Lee hyun Ji kim Sang-Cheol Jin Ye Jin kim Young Min kim Bong Sun You Jun Ho Bae Sung Hyuk Park Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Department of Materials Science and Metallurgical Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Missile Research Institute Agency for Defense DevelopmentDaejeon 34060Republic of Korea

This review article provides overall understanding of stainless,environment-friendly,and nonflammable Mg alloys(SEN alloys)recently developed at the Korea Institute of Materials *** alloys are produced by adding small amounts of Ca and Y(each<1 wt%)into commercial Mg–Al based alloys,resulting in exceptional ignition and corrosion resistances and impressive mechanical *** main advantages of SEN alloys are as follows.(1)A dense multi-oxide layer of SEN alloys comprising MgO,CaO,and Y_(2)O_(3) impedes the outward dispersion of Mg vapor and the inward penetration of O_(2) during oxidation,thereby enhancing the oxidation and ignition resistances.(2)The presence of Ca-and Y-based second-phase particles in SEN alloys can enhance their corrosion resistance because Ca-containing particles prevent the spread of corrosion,and the replacement of Al-containing particles with less noble ones containing Y(e.g.,Al–Mn–Y or Al–Y particles)retards corrosion.(3)The addition of minor amounts of Ca and Y renders excellent mechanical properties due to improved strengthening *** enhanced properties are attributed to more pronounced dynamic recrystallization and grain refining behaviors caused by the second-phase particles during extrusion.(4)Despite the presence of various types of second-phase particles,the fatigue properties of SEN9 alloys are similar to those of commercial AZ91 alloys.(5)Simultaneous introduction of Ca and Y suppresses the formation of Mg17Al12 discontinuous precipitates during aging,leading to the enhanced elongation of aged SEN alloys.(6)Adding mischmetal into the SEN9 alloy leads to a six-fold enhancement in ***,the studies conducted on SEN alloys demonstrate their excellent ignition and corrosion resistances and mechanical properties,which broaden the industrial applications of Mg alloys by addressing their inherent weaknesses.

关键词： SEN magnesium alloy Corrosion resistance Ignition resistance Mechanical properties Extrudability.

Realizing High Thermoelectric Performance in n-Type Se-Free Bi2Te3 Materials by Spontaneous Incorporation of FeTe2 Nanoinclusions

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Energy & Environmental Materials 2024年第4期7卷 344-354页

作者： Jamil Ur Rahman Woo hyun Nam Yong-Jae Jung jong Ho Won jong-Min Oh Nguyen Van Du Gul Rahman Víctor M.García-Suárez Ran He Kornelius Nielsch Jung Young Cho Won-Seon Seo jong Wook Roh Sang-il kim Soonil Lee Kyu Hyoung Lee hyun Sik kim Weon Ho Shin Leibniz Institute for Solid State and Materials Research Advanced Materials Convergence R&D Division Korea Institute of Ceramic Engineering & Technology Department of Electronic Materials Engineering Kwangwoon University Department of Energy Engineering Dankook University Faculty of Fundamental Science Phenikaa University Department of Physics Quaid-i-Azam University Departamento de Física Universidad de Oviedo Nanomaterials and Nanotechnology Research Center-CINN Department of Materials Science and Engineering Yonsei University School of Nano & Materials Science and Engineering Kyungpook National University Department of Materials Science and Engineering University of Seoul School of Materials Science and Engineering Changwon National University

Bi2Te3-based materials have drawn much attention from the thermoelectric community due to their excellent thermoelectric performance near room ***,the stability of existing n-type Bi2（Te,Se）3materials is still low due to the evaporation energy of Se (37.70 kJ mol-1) being much lower than that of Te (52.55 kJ mol-1).The evaporated Se from the material causes problems in interconnects of the module while degrading the efficiency.

关键词： Bi2Te3 energy harvesting FeTe2 nanoinclusion n-type materials thermoelectric