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Flash‑Induced High‑Throughput Porous Graphene via Synergistic Photo‑Effects for Electromagnetic Interference Shielding

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Nano-Micro Letters 2023年第11期15卷 1-18页

作者： Jin Soo Lee Jeong‑Wook kim Jae Hee Lee yong Koo Son Young Bin kim Kyoohee Woo Chanhee Lee Il‑Doo kim Jae Young seok Jong Won Yu Jung Hwan Park Keon Jae Lee Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak‑roYuseong‑guDaejeon 34141Republic of Korea School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak‑roYuseong‑guDaejeon 34141Republic of Korea Department of Printed Electronics Nano‑Convergence Manufacturing Systems Research DivisionKorea Institute of Machinery and Materials(KIMM)156 Gajeongbuk‑RoYuseong‑GuDaejeon 34103Republic of Korea Department of Mechanical System Design Engineering Seoul National University of Science and Technology232 Gongneung‑roNowon‑guSeoul 01811Republic of Korea Department of Mechanical Engineering(Department of Aeronautics Mechanical and Electronic Convergence Engineering)Kumoh National Institute of Technology61 Daehak‑roGumiGyeongbuk 39177Republic of Korea

Porous 2D materials with high conductivity and large surface area have been proposed for potential electromagnetic interference(EMI)shielding materials in future mobility and wearable applications to prevent signal noise,transmission inaccuracy,system malfunction,and health ***,we report on the synthesis of lightweight and flexible flash-induced porous graphene(FPG)with excellent EMI shielding *** broad spectrum of pulsed flashlight induces photo-chemical and photo-thermal reactions in polyimide films,forming 5×10 cm^(2)-size porous graphene with a hollow pillar structure in a few *** resulting material demonstrated low density(0.0354 g cm^(−3))and outstanding absolute EMI shielding effectiveness of 1.12×10^(5) dB cm^(2) g^(−1).The FPG was characterized via thorough material analyses,and its mechanical durability and flexibility were confirmed by a bending cycle ***,the FPG was utilized in drone and wearable applications,showing effective EMI shielding performance for internal/external EMI in a drone radar system and reducing the specific absorption rate in the human body.

关键词： Porous graphene Flash lamp Photo-pyrolysis High-throughput Electromagnetic interference shielding

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Expression of Ki-67,p53,and K-ras in chronic pancreatitis and pancreatic ductal adenocarcinoma

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World Journal of Gastroenterology 2005年第43期11卷 6765-6769页

作者： seok Jeong Don Haeng Lee Jung Il Lee Jin-Woo Lee Kye Sook Kwon Pum-Soo kim Hyung Gil kim yong Woon Shin Young Soo kim Young Bae kim Division of Gastroenterology Department of Pathology

AIM： To examine surgical specimens of pancreas with either chronic pancreatitis or pancreatic cancer in order to study whether ductal hyperplasia and dysplasia in pancreas represent precursor lesions for pancreatic cancer. METHODS： We examined expression of Ki-67, CEA, p53, and K-ras, in the surgical specimens of pancreas with adenocarcinomas （n = 11） and chronic pancreatitis （n = 12）. Cellular proliferation was assessed by Ki-67 proliferation index using the proliferation marker Ki-67. In specimens with pancreas cancer, we divided pancreas epithelium into normal （n = 7）, ductal hyperplasia （n = 3）, dysplasia （n = 4）, and cancerous lesion （n = 11） after hematoxylin and eosin staining, Ki-67, and CEA immunohistochemical staining. In cases with chronic pancreatitis, the specimen was pathologically examined as in cases with pancreas cancer, and they were also determined as normal （n = 10）, ductal hyperplasia （n = 4）, or dysplasia （n = 5）. p53 and K-ras expression were also studied by immunohistochemical staining. RESULTS： In pancreatic cancer, the Ki-67 index was 3.73±3.58 in normal site, 6.62±4.39 in ductal hyperplasia, 13.47：1：4.02 in dysplasia and 37.03±10.05 in cancer tissue, respectively. Overall, p53 was positive in normal ducts, ductal hyperplasia, dysplasia, and carcinoma cells in 0 of 14 （0%）, 0 of 7 （0%）, 7 of 9 （78%）, and 10 of 11 （91%）, respectively, and K-ras was positive in 0 of 8 （0%）, 1 of 3 （33%）, 4 of 6 （67%）, 4 of 5 （80%）, respectively. CONCLUSION： Our results favorably support the hypothesis that ductal hyperplasia and dysplasia of the pancreas might be precursor lesions for pancreas cancer. Further evaluation of oncogenes by the molecular study is needed.

关键词： Ki-67 p53 K-ras Chronic pancreatitis Pancreatic ductal adenocarcinoma

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Measurement and evaluation of whole body vibration of agricultural tractor operator

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International Journal of Agricultural and Biological Engineering 2017年第1期10卷 248-255页

作者： Md.Shaha Nur Kabir Sun-Ok Chung yong-Joo kim Nam-seok Sung Soon-Jung Hong Department of Biosystems Machinery Engineering Chungnam National UniversityDaejeon 34134Korea Department of Agricultural and Industrial Engineering Hajee Mohammad Danesh Science and Technology UniversityDinajpur 5200Bangladesh Rural Human Development Center Rural Development AdministrationJeonju 54875Korea

Exposure of whole body vibration(WBV)influences performance,comfort,and long term health risks of tractor ***,measurement and evaluation of WBV parameters should be carried out to find probable effects on the health of tractor *** this study,a system was designed to measure the WBV of agricultural tractor operators and evaluated the hazard risks on operator’s body according to the ISO standards,and implementation of the WBV test in the official testing station was also suggested.A tri-axial accelerometer was employed to measure vibrations transmitted to the seated operator body as a whole through the supporting surface of the buttock on four typical farm roads under different *** vector sum A(8)exposures on the rough tracks(earthen and grassland roads)exceeded the action limits of 0.5 m/s2 at a 10.9 km/h forward speed and reached to the action limit value at a 16.0 km/h forward speed on the concrete *** vector sum of VDV(8)exposures did not exceed the action limits of 9.1 m/s1.75 and was greater on the grassland *** vector sum Sed(8)exposures values exceeded the moderate probability of an adverse health limit of 0.5 MPa on all farm roads at high forward speeds and exceeded the high probability of an adverse health limit of 0.8 MPa on asphalt,concrete,and grassland roads which should be lower than the exposure limit values as suggested by the ISO and EC *** WBV evaluation procedure should be considered for implementation at the official tractor test station,which would response to domestic and international tractor test regulations and improve the market competitiveness.

关键词： agricultural tractor whole body vibration tractor operator driving safety ride comfort test standard health risk

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Genetic variation of the PSCA gene(rs2294008) is not associated with the risk of prostate cancer

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The Journal of Biomedical Research 2017年第3期31卷 226-231页

作者： II-seok Lee Sung Pil Seo Yun Sok Ha Pildu Jeong Ho Won Kang Won Tae kim yong-June kim seok Joong Yun Sang Cheol Lee Wun-Jae kim Department of Urology Chungbuk National University College of Medicine Department of Urology School of MedicineKyungpook National University

Prostate stem cell antigen（PSCA） is a cell-membrane glycoprotein consisting of 123 amino acids and highly expressed in the prostate,but there have been few reports on the relationship between rs2294008 of PSCA and prostate cancer in the ***,we evaluated the association between rs2294008 and the risk of prostate cancer.A total of 240 prostate cancer patients and 306 controls（patients with benign prostatic hyperplasia） were *** analysis of rs2294008 of PSCA was performed using *** regression analysis was performed according to the genotype of PSCA *** found that CT and TT genotypes were associated with an insignificant risk of prostate cancer compared with the CC genotype（P= 0.627 and 0.397,respectively）.In addition,there was no significant difference in rs2294008 according to clinicopathological parameters,such as age,Gleason score,prostate-specific antigen（PSA）,stage,and metastasis in prostate cancer（P 〉 0.05 for each）.Age,Gleason score,PSA,pathologic stage,and metastasis did not modify the association between PSCA and the risk of prostate cancer（each P 〉 0.05 for each）.Taken together,the genetic polymorphism of PSCA rs2294008 was not associated with the risk of prostate *** results suggest that rs2294008 may not play a role in prostate carcinogenesis.

关键词： prostatic neoplasms polymorphism genetic risk prostate polymorphism single nucleotide

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Solvent extraction and stripping of lithium ion from aqueous solution and its application to seawater

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Rare Metals 2016年第12期35卷 948-953页

作者： Gregorius Rionugroho Harvianto seok-Hyeon kim Chang-Sik Ju Department of Chemical Engineering Pukyong National University

For the development of lithium ion recovery process from seawater, a series of experimental researches were performed. Solvent extraction of lithium ion from aqueous solution using kerosene as solvent was proposed. Lithium ion is effectively extracted by thenoyltrifluoroace- tone-trioctylphosphine oxide （TTA-TOPO） in kerosene within 80 min. Extraction efficiency is severely influenced by stoichiometric parameters. Among the stoichiometric parameters, volume ratio of aqueous （A） to extraction （E） solution is the most influential parameter. After extrac- tion, lithium ion could be easily stripped from the extraction solution by acidic solutions. Stripping efficiency decreases with pH of acidic solutions, and the kind of acid does not affect the stripping efficiency. Extraction efficiency main- tains at more than 93 % even when the extraction solution is recycled three times. 65 % of lithium ion can be extracted from seawater by this solvent extraction process when magnesium ion is precipitated by NHaOH prior to solvent extraction process. Other metallic ions in seawater decrease the extraction efficiency of lithium ion.

关键词： Lithium Thenoyltrifluoroacetone Trioctylphosphine oxide Solvent extraction Stripping Recycling

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Potential risk factors for nonalcoholic steatohepatitis related to pancreatic secretions following pancreaticoduodenectomy

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World Journal of Gastroenterology 2011年第32期17卷 3716-3723页

作者： Sun Choon Song Seong Ho Choi Dong Wook Choi Jin seok Heo Woo seok kim Min Jung kim Department of Surgery Samsung Medical Center Sungkyunkwan University School of Medicine

AIM: To identify risk factors for nonalcoholic steatohepatitis following pancreaticoduodenectomy, with a focus on factors related to pancreatic secretions. METHODS: The medical records of 228 patients who had a pancreaticoduodenectomy over a 16-mo period were reviewed retrospectively. The 193 patients who did not have fatty liver disease preoperatively were included in the final analysis. Hepatic steatosis was diagnosed using the differences between splenic and hepatic attenuation and liver-to-spleen attenuation as measured by non-enhanced computed tomography. RESULTS: Fifteen patients (7.8%) who showed postoperative hepatic fatty changes were assigned to Group A, and the remaining patients were assigned to Group B. Patient demographics, preoperative laboratory findings (including levels of C-peptide, glucagon, insulin and glucose tolerance test results), operation types, and final pathological findings did not differ significantly between the two groups; however, the frequency of pancreatic fistula (P = 0.020) and the method of pancreatic duct stenting (P = 0.005) showed significant differences between the groups. A multivari- ate analysis identified pancreatic fistula (HR = 3.332, P = 0.037) and external pancreatic duct stenting (HR = 4.530, P = 0.017) as independent risk factors for the development of postoperative steatohepatitis. CONCLUSION: Pancreatic fistula and external pancreatic duct stenting were identified as independent risk factors for the development of steatohepatitis following pancreaticoduodenectomy.

关键词： Nonalcoholic fatty liver diseases Nonalcoholic steatohepatitis Pancreatic duct stenting Pancreatic fistula Pancreatic surgery

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Thalidomide effect in endothelial cell of acute radiation proctitis

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World Journal of Gastroenterology 2008年第30期14卷 4779-4783页

作者： Ki-Tae kim Hiun-Suk Chae Jin-Soo kim Hyung-Keun kim Young-seok Cho Whang Choi Kyu-yong Choi Sang-Young Rho Suk-Jin Kang Department of Radiology College of Medicine The Catholic University of Korea Uijeongbu St. Mary’s Hospital Department of Internal Medicine College of Medicine The Catholic University of Korea Uijeongbu St. Mary's Hospital Department of Internal Medicine College of Medicine The Catholic University of Korea Our Lady of Mercy Hospital Department of Internal Medicine College of Medicine The Catholic University of Korea Uijeongbu St. Mary’s Hospital Department of Pathology College of Medicine The Catholic University of Korea St. Vincent Hospital

AIM: To determine whether thalidomide prevents microvascular injury in acute radiation proctitis in white rats. METHODS: Fourteen female Wistar rats were used: six in the radiation group, six in the thalidomide group, and two in normal controls. The radiation and thalidomide groups were irradiated at the pelvic area using a single 30 Gy exposure. The thalidomide (150 mg/kg) was injected into the peritoneum for 7 d from the day of irradiation. All animals were sacrificed and the rectums were removed on day 8 after irradiation. The microvessels of resected specimens were immunohistochemically stained with thrombomodulin (TM), von Willebrand Factor (vWF), and vascular endothelial growth factor (VEGF). RESULTS: The microscopic scores did not differ significantly between the radiation and thalidomide groups, but both were higher than in the control group. Expression of TM was significantly lower inthe endothelial cells (EC) of the radiation group than in the control and thalidomide groups (P < 0.001). The number of capillaries expressing vWF in the EC was higher in the radiation group (15.3 ± 6.8) than in the control group (3.7 ± 1.7), and the number of capillaries expressing vWF was attenuated by thalidomide (10.8 ± 3.5, P < 0.001). The intensity of VEGF expression in capillaries was greater in the radiation group than in the control group and was also attenuated by thalidomide (P = 0.003). CONCLUSION: The mechanisms of acute radiation- induced proctitis in the rats are related to endothelial cell injury of microvessel, which may be attenuated with thalidomide.

关键词： Radiation proctitis Von Willebrand factor Thrombomodulin Vascular endothelial growth factor Thalidomide

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Reaction mechanism and additional lithium storage of mesoporous MnO_(2) anode in Li batteries

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Journal of Energy Chemistry 2021年第2期30卷 276-284,I0010页

作者： Jaesang Yoon Woosung Choi Taewhan kim Hyunwoo kim Yun seok Choi Ji Man kim Won-Sub Yoon Department of Energy Science Sungkyunkwan UniversitySuwon 16419South Korea Department of Chemistry Sungkyunkwan UniversitySuwon 16419South Korea

Nanostructured transition metal oxides,employed as anode materials for lithium-ion batteries,exhibit a higher capacity than the theoretical capacity based on the conversion *** date,the reasons behind this phenomenon are *** the one-step evolution of anode material for lithium-ion batteries,it is essential to understand the lithium storage reaction mechanism of the anode ***,we provide a detailed report on the lithium storage and release mechanism of MnO2,using synchrotron-based X-ray techniques.X-ray diffraction and X-ray absorption spectroscopy results indicate that during the first discharge,MnO2 is reduced in the order of MnO2→LixMnO2(1

关键词： Mesoporous MnO_(2) Reaction mechanism Electrolyte-derived surface layer Synchrotron-based X-ray techniques Anode Li battery

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Investigation of Domain Wall Velocity to External Fields for High-Quality Waveguide-Type Periodically Poled LiNbO_(3) Fabrication

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Journal of Rare Earths 2006年第Z1期24卷 131-135页

作者： Soo Woo Kwon Woo seok Yang H M Lee Woo Kyung kim Hang yong Lee Dae Ho Yoon Yo Seung Song Department of Materials Engineering Hankuk Aviation UniversityGoyang 412-791Korea Nano Bio-Photonics Team Korea Electronics Technology InstituteBundang 463-816Korea Department of Advanced Material Engineering Sungkyunkwan UniversitySuwon 440-746Korea

The Ti-doped waveguide-type periodically poled LiNbO_(3)(PPLN)were fabricated and the dependence of domain wall velocity on an external field applied for domain inversion was *** whole polarization reversal process was computer-controlled to regulate domain wall expansion at a feedback time shorter than 5μ*** coercive voltage and several values of excess voltage were applied on 500μm-thick wafers serially connected to a 1-MOhm external resistor which had an effect of the poling current reduction,*** deceleration of domain wall *** domain wall velocity is sensitive to the poling voltage,precisely speaking,to the excess *** domain wall velocities were 28.70,16.02 and 5.75μm·s^(-1)under poling field of 23.5,22.0 and 21.0 kV·mm^(-1),***,average duty cycle of PPLN is about 49.93%.

关键词： periodically poled lithium niobate coerciv field duty cycle domain wall velocity quasi phase matching

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A squamous metaplasia in a gastric ulcer scar of the antrum

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World Journal of Gastroenterology 2008年第8期14卷 1296-1298页

作者： Young-seok Cho Jin-Soo kim Hyung-Keun kim Jeong-Seon Ji Byung-Wook kim Hiun-Suk Chae Sok-Won Han Kyu-yong Choi In-Sik Chung Department of Internal Medicine College of Medicine The Catholic University of Korea Uijeongbu St. Mary's Hospital Gyeonggi-do 480-717 Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Our Lady of Mercy Hospital Gyeonggi-do Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Holy Family Hospital Gyeonggi-do Korea Department of Internal Medicine College of Medicine The Catholic University of Korea Kangnam St. Mary’s Hospital Seoul Korea

An 81-year-old man presented with epigastric pain and weight loss for one month. He had a past history of pulmonary tuberculosis, 10 years ago. We performed a gastroscopy, which showed a linear depressed whitish gastric ulcer scar (0.8 cm in length) in the posterior wall of the prepyloric antrum. The result of biopsy was reported as squamous epithelium. Immunohistochemical staining using an antibody to high molecular weight cytokeratin (HMC) revealed positive staining in the squamous epithelium. Two years later, the lesion was followed up. The lesion remained at same site endoscopically, but no squamous epithelium could be seen microscopically.

关键词： Squamous metaplasia Gastric ulcer scar High molecular weight cytokeratin

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