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Steam activation of Fe-N-C catalyst for advanced power performance of alkaline hydrazine fuel cells

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Journal of Energy Chemistry 2022年第1期31卷 276-285,I0008页

作者： Sooan Bae Jihyeon Park Yuna hwang jin-Soo Park Jaeyoung Lee Beomgyun Jeong Research Center for Materials Analysis Korea Basic Science Institute169-14&Gwahak-roDaejeon 34133Republic of Korea School of Earth Sciences and Environmental Engineering Gwangju Institute of Science and Technology123 Cheomdangwagi-ro.Buk-guGwangju 61005Republic of Korea Department of Green Chemical Engineering Sangmyung University31 Sangmyungdae-gilDongnam-gu.CheonanChungnam Province 31066Republic of Korea Ertl Center for Electrochemistry and Catalysis Gwangju Institute of Science and Technology123 Cheomdangwagi-roBuk-giiGwangju 61005Republic of Korea

Alkaline hydrazine liquid fuel cells(AHFC) have been highlighted in terms of high power performance with non-precious metal *** Fe-N-C is a promising non-Pt electrocatalyst for oxygen reduction reaction(ORR),the surface density of the active site is very low and the catalyst layer should be thick to acquire the necessary number of catalytic active *** this thick catalyst layer,it is important to have an optimum pore structure for effective reactant conveyance to active sites and an interface structure for faster charge ***,we prepare a Fe-N-C catalyst with magnetite particles and hierarchical pore structure by steam *** steam activation process significantly improves the power performance of the AHFC as indicated by the lower IR and activation voltage *** on a systematic characterization,we found that hierarchical pore structures improve the catalyst utilization efficiency of the AHFCs,and magnetite nanoparticles act as surface modifiers to reduce the interracial resistance between the electrode and the ion-exchange membrane.

关键词： Alkaline hydrazine fuel cell Oxygen reduction reaction Electrocatalyst Steam activation Ohmic loss Interfacial resistance Surface modifier

Monolayer Graphitic Carbon Nitride as Metal-Free Catalyst with Enhanced Performance in Photo- and Electro-Catalysis

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Nano-Micro Letters 2022年第3期14卷 308-321页

作者： Huiyan Piao Goeun Choi Xiaoyan jin Seong‑Ju hwang Young Jae Song Sung‑Pyo Cho jin‑Ho Choy Intelligent Nanohybrid Materials Laboratory(INML) Institute of Tissue Regeneration Engineering(ITREN)Dankook UniversityCheonan 31116Republic of Korea College of Science and Technology Dankook UniversityCheonan 31116Republic of Korea Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center for Regenerative Medicine Dankook UniversityCheonan 31116Republic of Korea Department of Materials Science and Engineering College of EngineeringYonsei UniversitySeoul 03722Republic of Korea SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan University(SKKU)Suwon 440‑746Republic of Korea Department of Nano Engineering Sungkyunkwan University(SKKU)Suwon 440‑746Republic of Korea National Center for Inter‑University Research Facilities(NCIRF) Seoul National UniversitySeoul 08826Republic of Korea Graphene Research Center Advanced Institute of Convergence TechnologySuwon 16229Republic of Korea Department of Pre‑Medical Course College of MedicineDankook UniversityCheonan 31116Republic of Korea Tokyo Tech World Research Hub Initiative(WRHI) Institute of Innovative ResearchTokyo Institute of TechnologyYokohama 226‑8503Japan

The exfoliation of bulk graphitic carbon nitride(g-C_(3)N_(4))into monolayer has been intensively studied to induce maximum sur-face area for fundamental studies,but ended in failure to realize chemi-cally and physically well-defined monolayer of g-C_(3)N_(4)mostly due to the difficulty in reducing the layer thickness down to an atomic *** has,therefore,remained as a challenging issue in two-dimensional(2D)chemistry and physics *** this study,an“atomic monolayer of g-C_(3)N_(4)with perfect two-dimensional limit”was successfully prepared by the chemically well-defined two-step *** atomically resolved monolayer of g-C_(3)N_(4)was also confirmed by spectroscopic and micro-scopic *** addition,the experimental Cs-HRTEM image was collected,for the first time,which was in excellent agreement with the theoretically simulated;the evidence of monolayer of g-C_(3)N_(4)in the perfect 2D limit becomes now clear from the HRTEM image of orderly hexagonal symmetry with a cavity formed by encirclement of three adjacent heptazine *** to bulk g-C_(3)N_(4),the present g-C_(3)N_(4)monolayer showed significantly higher photocatalytic gen-eration of H2O2 and H2,and electrocatalytic oxygen reduction *** addition,its photocatalytic efficiency for H2O2 production was found to be the best for any known g-C_(3)N_(4)nanomaterials,underscoring the remarkable advantage of monolayer formation in optimizing the catalyst performance of g-C_(3)N_(4).

关键词： Graphitic carbon nitride Monolayer Atomic image Electro-and photo-catalysis

Comparison Study and Forensic Analysis between Experiment and Coupled Dynamics Simulation for Submerged Floating Tunnel Segment with Free Ends under Wave Excitations

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Computer Modeling in Engineering & Sciences 2023年第10期137卷 155-174页

作者： Woo Chul Chung Chungkuk jin Moo Hyun Kim Ju-young hwang Division of Mechanical Engineering Korea Maritime&Ocean UniversityBusanSouth Korea Department of Ocean Engineering and Marine Sciences Florida Institute of TechnologyMelbourneFLUSA Department of Ocean Engineering Texas A&M UniversityCollege StationTXUSA Department of Civil Engineering Dong-Eui UniversityBusanSouth Korea

This paper presents dynamic-behavior comparisons and related forensic analyses of a submerged floating tunnel(SFT)between numerical simulation and physical experiment under regular and irregular *** experiments are conducted in the 3Dwave tank with 1:33.3 scale,and the corresponding coupled time-domain simulation tool is devised for *** entire SFT systemconsists of a long concrete tunnel and 12 tubular aluminummooring *** numerical simulation models,the Cummins equation with 3D potential theory including second-order wave-body interaction effects and the much simpler Morison-equation-based formula with the lumped-massbased line model,are designed and *** analyses for mooring-line adjustments in the simulation are carried out in view of the best representation of the physical *** that,the measured pre-tension distribution and systemstiffness of twelvemooring lines arewell reproduced in the ***,the dynamic responses and mooring tensions of the SFT are compared under regular and irregular *** measured and simulated results coincide reasonably well for both regular-and irregular-wave conditions.

关键词： Submerged floating tunnel comparative study forensic analysis mooring-line modeling dynamic response mooring tension

Accidental esophageal intubation via a large type C congenital tracheoesophageal fistula:A case report

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World Journal of Clinical Cases 2022年第30期10卷 11198-11203页

作者： Seong Min hwang Myeong jin Kim Sora Kim Saeyoung Kim Department of Anesthesiology and Pain Medicine School of MedicineKyungpook National UniversityDaegu 41944South Korea

BACKGROUND Tracheoesophageal fistula(TEF)is a congenital anomaly characterized by interruptions in esophageal continuity with or without fistulous communication to the *** management during TEF repair is challenging because of the difficulty of perioperative airway *** is important to determine the appropriate position of the endotracheal tube(ETT)for proper ventilation and to prevent excessive gastric ***,the tip of the ETT should be placed immediately below the fistula and above the *** SUMMARY A full-term,one-day-old,2.4 kg,50 cm male neonate was diagnosed with TEF type *** induction,an ETT was inserted using video laryngoscope and advanced deeply to ensure that the tip passed over the fistula,according to known *** passage of the ETT through the vocal cords was confirmed via video ***,after inflating the ETT cuff,breath sounds were not heard on bilateral lung ***,gastric sounds were *** that a large fistula(approximately 6.60 mm×4.54 mm)located 10.2mm above the carina was confirmed on preoperative tracheal computed tomography,the possibility of unintentional esophageal intubation was highly ***,we decided to uncuff and withdraw the ETT carefully for repositioning,while monitoring auscultation and end-tidal CO2 *** a certain point(9.5 cm from the lip),clear breath sounds and proper end-tidal CO_(2) readings were suddenly achieved,and adequate ventilation was *** Preanesthetic anatomical evaluation with imaging studies in TEF is necessary to minimize complications related to airway management.

关键词： Tracheoesophageal fistula Imaging study Anatomy Intubation Airway management Auscultation Case report

Ataxic gait following total gastrectomy for gastric cancer

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World Journal of Gastroenterology 2016年第37期22卷 8435-8438页

作者： Chang Ho hwang Dong jin Park Gyu Yeol Kim Department of Physical Medicine and Rehabilitation Medicine Ulsan University Hospital University of Ulsan College of Medicine Department of Surgery Ulsan University Hospital University of Ulsan College of Medicine

A 58-year-old woman, who had undergone total gastrectomy for early gastric cancer 9 years previously, visited the outpatient clinic complaining of progressive difficulty in walking for 15 d. Laboratory examinations showed macrocytic anemia and a decreased serum vitamin B12 concentration and increased serum concentrations of folate, vitamin E and copper. Magnetic resonance imaging showed multifocal high signal intensities along the posterior column of the cervical and thoracic spinal cord. Treatment consisted of intramuscular injections of vitamin B12 for 7 d, which increased her serum level of vitamin B12 to normal. This was followed by weekly intramuscular injections of vitamin B12 for another 2 wk and oral administration of vitamin B12 three times per day. After comprehensive rehabilitation for 4 wk, she showed sufficient improvements in strength and ataxic gait, enabling her to return to her normal daily activities.

关键词： Subacute combined degeneration Vitamin B12 deficiency Total gastrectomy Gastric cancer

Performance analysis of QoS routing protocol for WiMedia networks

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Journal of Central South University 2012年第12期19卷 3468-3474页

作者： JUNG jin-uk jin Kyo-hong hwang Min-tae JEON Young-ae Department of Electronics Engineering Changwon National UniversityChangwon 641-773Korea Department of Information Communication Changwon National UniversityChangwon 641-773Korea Green Converged Wireless Systems Research Team ETRIDaejeon 305-700Korea

Though the WiMedia supports higher data rates than other WPAN technologies,a WiMedia device cannot reach other devices that are separated from it by more than 10 m,which is the typical limited transmission range of the WiMedia *** this work,we propose a multi-hop QoS routing protocol to enable WiMedia devices to transmit real-time data to devices that are located out of the transmission *** proposed routing protocol is a hybrid algorithm,which mixes the table-driven and on-demand routing algorithms,searching one or more routes according to the number of hops to a destination *** MAC is potentially capable of learning the existence of neighbor devices by using a beacon *** utilizing the neighbors' information,all devices can create routing entries for devices within 2-hops *** devices beyond the 2-hop range,the newly designed on-demand routing algorithm is applied to multi-hop *** a routing entry for a destination device is not listed in the routing table,the source device sends a request packet to 2-hop range devices which could be found in the routing *** every device maintains routing entries for 2-hop range devices in the routing table,the request packet is replied in advance before its arrival at the destination ***,to decide the optimal route for a destination device,the number of medium access slots(MASs),received signal strength indicator(RSSI)and hop count are utilized to establish a QoS-enabled routing *** perform ns-2 simulation to investigate the performance of the proposed routing protocol with AODV and *** simulation results show that the proposed protocol has better throughput and lower overhead than other protocols.

关键词： WiMedia WPAN multi-hop routing protocol QoS hybrid routing protocol

Beta-nerve growth factor gene therapy alleviates pyridoxine-induced neuropathic damage by increasing doublecortin and tyrosine kinase A in the dorsal root ganglion

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Neural Regeneration Research 2020年第1期15卷 162-168页

作者： Hyun-Kee Cho Woosuk Kim Kwon-Young Lee jin-Ok Ahn Jung Hoon Choi In Koo hwang jin-Young Chung Department of Veterinary Internal Medicine and Institute of Veterinary Science College of Veterinary MedicineKangwon National UniversityChuncheonKangwon-doSouth Korea Department of Anatomy and Cell Biology College of Veterinary MedicineResearch Institute for Veterinary ScienceSeoul National UniversitySeoulSouth Korea Department of Anatomy College of Veterinary MedicineKangwon National UniversityChuncheonKangwon-doSouth Korea

Beta-nerve growth factor(β-NGF) is known to be a major leading cause of neuronal plasticity. To identify the possible action mechanisms of β-NGF gene therapy for sciatic nerve recovery, experimental dogs were randomly divided into control, pyridoxine, and pyridoxine + β-NGF groups. We observed chronological changes of morphology in the dorsal root ganglia in response to pyridoxine toxicity based on cresyl violet staining. The number of large neurons positive for cresyl violet was dramatically decreased after pyridoxine intoxication for 7 days in the dorsal root ganglia and the neuron number was gradually increased after pyridoxine withdrawal. In addition, we also investigated the effects of β-NGF gene therapy on neuronal plasticity in pyridoxine-induced neuropathic dogs. To accomplish this, tyrosine kinase receptor A(TrkA), βIII-tubulin and doublecortin(DCX) immunohistochemical staining was performed at 3 days after the last pyridoxine treatment. TrkA-immunoreactive neurons were dramatically decreased in the pyridoxine group compared to the control group, but strong TrkA immunoreactivity was observed in the small-sized dorsal root ganglia in this group. TrkA immunoreactivity in the dorsal root ganglia was similar between β-NGF and control groups. The numbers of βIII-tubulin-and DCX-immunoreactive cells decreased significantly in the pyridoxine group compared to the control group. However, the reduction of βIII-tubulin-and DCX-immunoreactive cells in the dorsal root ganglia in the β-NGF group was significantly ameliorated than that in the pyridoxine group. These results indicate that β-NGF gene therapy is a powerful treatment of pyridoxine-induced neuropathic damage by increasing the TrkA and DCX levels in the dorsal root ganglia. The experimental protocol was approved by the Institutional Animal Care and Use Committee(IACUC) of Seoul National University, South Korea(approval No. SNU-060623-1, SNU-091009-1) on June 23, 2006 and October 9, 2009, respectively.

关键词： β-nerve growth factor βIII-tubulin doublecortin gene therapy neuron-glial antigen 2 neuropathy pyridoxine

Overcoming the penetration depth limit in optical microscopy:Adaptive optics and wavefront shaping

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Journal of Innovative Optical Health Sciences 2019年第4期12卷 3-20页

作者： Cheolwoo Ahn Byungjae hwang Kibum Nam Hyungwon jin Taeseong Woo Jung-Hoon Park Department of Biomedical Engineering Ulsan National Institute of Science and Technology(UNIST)Ulsan South Korea

Despite the unique advantages of optical microscopy for molecular specific high resolution imaging of living structure in both space and time,curent applications are mostly limited to research *** is due to the aberrations and multiple scattering that is induced by the inhomogeneous refractive boundaries that are inherent to biological ***,recent developments in adaptive optics and wavefront shaping have shown that high resolution optical imaging is not fundamentally limited only to the observation of single cells,but can be significantly enhanced to realize deep tissue *** provide insight into how these two closely related fields can expand the limits of bio imaging,we review the recent progresses in their performance and applicable range of studies as well as potential future research directions to push the limits of deep tissuse imnaging.

关键词： Adaptive optics wavefront shaping optical aberration multiple scattering in-viuo imaging

Hepatocellular carcinoma with macrovascular invasion:need a personalized medicine for this complicated event

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Hepatobiliary Surgery and Nutrition 2024年第1期13卷 188-190页

作者： Hyeonseung hwang Ju Hyun Shim jin Hyoung Kim Department of Radiology and Research Institute of Radiology Asan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea Department of Gastroenterology Asan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea

Hepatocellular carcinoma(HCC)is a hypervascular tumor and has a tendency to invade portal vein(PV)or hepatic vein(HV).HCC with macrovascular invasion(MVI)is associated with poor prognosis(1).HCC invasion of PV can lead to rapid intrahepatic tumor *** addition,portal vein tumor thrombus(PVTT)may result in deterioration of hepatic function,as well as increased risk of portal hypertensive complications(2).HCC invasion of HV is associated with increased risk of systemic ***.

关键词： invasion hepatic hypertensive