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Porcine vesical acellular matrix graft of tunica albuginea for penile reconstruction

Asian Journal of Andrology 2006年第5期8卷 543-548页

作者： Kwan-joong joo Byung-Soo Kim jeong-Ho Han Chang-Ju Kim Chil-HunKwon Heung-JaePark Department of Urology Kangbuk Samsung HospitalSungkyunkwan University School of Medicine108 Pyung-DongJongro-KuSeoul 110-746Korea Department of Chemical Engineering Hanyang University College of Engineering 17 Hangdang-DongSeongdong-KuSeoul 133-791Korea Department of Pathology Samsung Medical CenterSungkyunkwan University School of Medicine50 Ilwon-DongGangnam-KuSeoul 135-710Korea Department of Physiology Kyung Hee University College of Medicine1 Hoegi-DongDongdaemun-Ku Seoul 130-701Korea

Aim： To characterize the feasibility of the surgical replacement of the penile tunica albuginea （TA） and to evaluate the value of a porcine bladder acellular matrix （BAM） graft. Methods： Acellular matrices were constructed from pigs＇ bladders by cell lysis, and then examined by scanning electron microscopy （SEM）. Expression levels of the mRNA of the vascular endothelial growth factor （VEGF） receptor, fibroblast growth factor （FGF）-1 receptor, neuregulin, and brain-derived neurotrophic factor （BDNF） in the acellular matrix and submucosa of the pigs＇ bladders were determined through the reverse transcription-polymerase chain reaction （PCR）. A 5 mm× 5 mm square was excised from the penile TA of nine rabbits. The defective TA was then covered in porcine BAM. Equal numbers of animals were sacrificed and histochemically examined at 2, 4 and 6 months after implantation. Results： SEM of the BAM showed collagen fibers with many pores. VEGF receptor, FGF-1 receptor and neuregulin mRNA were expressed in the porcine BAM; BDNF mRNA was not detected. Two months after implantation, the graft sites exhibited excellent healing without contracture, and the fusion between the graft and the neighboring normal TA appeared to be well established. There were no significant histological differences between the implanted tunica and the normal control tunica at 6 months after implantation. Conclusion： The porcine BAM graft resulted in a structure which was sufficiently like that of the normal TA. This implantation might be considered applicable to the reconstruction of the TA in conditions such as trauma or Peyronie＇s disease.

关键词： tissue engineering extracellular matrix penis reconstructive surgical procedure graft survival

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Evolution of microstructure and tensile properties of cold-drawn hyper-eutectoid steel wires during post-deformation annealing

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Journal of Materials Science & Technology 2020年第6期41卷 1-11页

作者： Majid Jafari Chan-woo Bang Jong-Chan Han Kyeong-Min Kim Seon-Hyeong Na Chan-Gyung Park Byeong-joo Lee Department of Materials Science and Engineering POSTECH Pohang 37673 South Korea

Manufacturing temperatures of severely cold-drawn hyper-eutectoid steel wires are sufficiently high to influence the mobility of dislocations and alloy elements,thereby affecting the materials’mechanical ***,we describe the evolution of microstructure and tensile strength of the as-drawn 3.45 GPa steel wire during post-deformation annealing for 30 min at 150-450℃.Annealing at 150℃raised the strength to 3.77 GPa by age-hardening through activation of dislocations pinning by carbon,while further temperature rising up to 450℃caused a severe loss of *** was proved that annealing at 300 and 450℃destabilizes the lamellar microstructure,promoting the formation of carbon-deficient(Fe,Mn,Cr)3 C-type cementite particles with preferentially rounded and partially faceted *** at 450℃yielded the accumulation of Mn and Cr at the ferrite/particle interfaces,and their concentrations at the interfaces were dependent on the interface structure;i.e.,lower concentrations at rounded interfaces(formed through capillarity–driven coarsening of the spheroidized cementite),and higher concentrations at faceted interfaces(that are initially existing in the as-drawn state).Our proof-of-principle observations,supported by thermodynamic calculations and kinetic assessments,provide a pathway for understanding the changes in microstructural and tensile properties during manufacturing of the hyper-eutectoid steel wires.

关键词： Three-dimensional atom probe(3DAP) High resolution transmission electron microscopy(HRTEM) Nano-grained low-carbon steel Annealing Tensile behavior

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Effect of expanding nanocellulose sponge on nasal mucosal defects in an animal model

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Regenerative Biomaterials 2020年第1期7卷 47-52页

作者： JiWon Kim Kyungbae woo jeong Mi Kim Mi Eun Choi Young-Mo Kim Su-Geun Yang Bong Sup Shim jeong-Seok Choi Department of Otorhinolaryngology Inha UniversityCollege of Medicine27 Inhang-roJung-guIncheon 22332Republic of Korea Department of Chemical Engineering Inha University100 InharoMichuholguIncheon 22212Republic of Korea Department of New Drug Development Inha UniversityCollege of MedicineB-308Chungsuk Bldg.366Seohae-DaeroJung-GuIncheon 22332Republic of Korea

Nanocellulose has emerged for a wide range of applications in biomedical engineering because of its water absorption capacity,appropriate *** investigated the hemostatic and regenerative abilities of an expanding polyvinyl alcohol(PVA)-nanocellulose sponge on nasal mucosal defects.A 3 mm-diameter nasal defect was made in experimental *** were divided into four groups with control,vaseline,PVA and PVA-nanocellulose packing *** the defect was created,bleeding times and amounts were *** materials were removed on experimental day(ED)*** ED 3,7 and 14,histological analysis and immunohistochemical study for neutrophils were *** cells were counted and epithelial thicknesses were *** amounts and times in the vaseline packing group were smaller than in the PVA ***-nanocellulose group showed less neutrophils than in the other groups on ED *** epithelium thickness in the PVA-nanocellulose group was significantly smaller than in the control group at ED 7,but at ED 14,there was no significant intergroup *** group had a significant lower inflammatory cell count than the control group on ED ***-nanocellulose sponge applied to nasal mucosal defects can significantly enhance mucosal regeneration during early wound healing.

关键词： polyvinyl alcohol nasal mucosa nanocellulose

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A Simple Method for Grain Refinement of Pure Aluminium

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Journal of Materials Science & Technology 2003年第2期19卷 187-188页

作者： Dae-Heon joo, jeong-Keun Lee and Myung-Ho KimSchool of Materials Science and Engineering, Inha University, Inchon 402-751, Korea Sch. of Mat. Sci. and Eng. Inha Univ. Inchon 402-75 South Korea

In order to produce the fully equiaxed and fine grained pure Al, a simple casting process that used cooling slope was examined and compared with conventional casting process under same casting conditions. By using cooling slope, grains over the whole section of castings were suddenly refined and ability of grain refinement kept up at very high mold temperature up to 550癈 in examined casting conditions.

关键词： Equiaxed microstructure Heterogeneous nucleation Grain refinement

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Boosting Pseudocapacitive Behavior of Supercapattery Electrodes by Incorporating a Schottky Junction for Ultrahigh Energy Density

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Nano-Micro Letters 2023年第5期15卷 15-35页

作者： Selvaraj Seenivasan Kyu In Shim Chaesung Lim Thangavel Kavinkumar Amarnath T.Sivagurunathan jeong woo Han Do-Heyoung Kim School of Chemical Engineering Chonnam National University77 Yongbong-RoGwangju 61186Republic of Korea Division of Environmental Science and Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea

Pseudo-capacitive negative electrodes remain a major bottleneck in the development of supercapacitor devices with high energy density because the electric double-layer capacitance of the negative electrodes does not match the pseudocapacitance of the corresponding positive *** the present study,a strategically improved Ni-Co-Mo sulfide is demonstrated to be a promising candidate for high energy density supercapattery devices due to its sustained pseudocapacitive charge storage *** pseudocapacitive behavior is enhanced when operating under a high current through the addition of a classical Schottky junction next to the electrode-electrolyte interface using atomic layer *** Schottky junction accelerates and decelerates the diffusion of OH-/K+ions during the charging and discharging processes,respectively,to improve the pseudocapacitive *** resulting pseudocapacitive negative electrodes exhibits a specific capacity of 2,114 C g^(-1)at 2 A g^(-1)matches almost that of the positive electrode’s 2,795 C g^(-1)at 3 A g^(-1).As a result,with the equivalent contribution from the positive and negative electrodes,an energy density of 236.1 Wh kg^(-1)is achieved at a power density of 921.9 W kg^(-1)with a total active mass of 15 mg *** strategy demonstrates the possibility of producing supercapacitors that adapt well to the supercapattery zone of a Ragone plot and that are equal to batteries in terms of energy density,thus,offering a route for further advances in electrochemical energy storage and conversion processes.

关键词： Pseudo-capacitance Negative electrode Supercapattery Atomic layer deposition Energy density

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The Study on Effect of Exhaust Performance According to Active Muffler Valve Spring as Followed Spring Constant

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Journal of Thermal Science 2002年第4期11卷 372-377页

作者： Seuk Cheun Choi Tae woo Kong Han Shik Chung Hyo Min jeong Young Heung Chun Graduate School of Mechanical and Precision Engineering Gyeongsang National UniversityInpyeongdong 445 Tongyong Kyongnam 650-160Korea School of Transport Vehicle Engineering Gyeongsang National UniversityThe Institute of Marine IndustryInpyeongdong 445 Tongyong Kyongnam 650-160Korea

This study represents the influence on exhaust performance by active muffler valve *** main experimental parameters were engine speeds and torsion coil spring constants in the active *** the muffler valve spring has a low spring constant of k=0.75,the sound pressure level was low at the region of engine speed 2000 to 2500 r/min,and the velocity of exhaust gas was high at spring constant k=*** the engine speed was under 1500 r/min,the mean concentration of CO was high in case without muffler *** the engine speed in the range of 1600 to 2600 r/min with spring constant k=0.75,the mean HC concentration showed the lowest *** muffler valve,the temperature in the muffler was higher than the case with muffler *** research represented that the performance of the active muffler valve spring constant k=0.75 was higher than that without muffler valve and valve spring constant k=*** the three cases of experimental condition,with a spring constant k=0.75,0.70 and without muffler valve,the exhaust performance was high in case active muffler valve spring constant k=0.70.

关键词： active muffler torsion coil spring spring constant sound pressure level

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Precise control of surface oxygen vacancies in ZnO nanoparticles for extremely high acetone sensing response

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Journal of Advanced Ceramics 2022年第5期11卷 769-783页

作者： Jihyun LEE Youngmoon CHOI Byoung joon PARK jeong woo HAN Hyun-Sook LEE Jong Hyeok PARK wooyoung LEE Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical and Biological Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoul 03722Republic of Korea

ZnO has been studied intensely for chemical sensors due to its high sensitivity and fast ***,we present a simple approach to precisely control oxygen vacancy contents to provide significantly enhanced acetone sensing performance of commercial ZnO nanopowders.A combination of H_(2)O_(2)treatment and thermal annealing produces optimal surface defects with oxygen vacancies on the ZnO nanoparticles(NPs).The highest response of~27,562 was achieved for 10 ppm acetone in 0.125 MH_(2)O_(2)treated/annealed ZnO NPs at the optimal working temperature of 400℃,which is significantly higher than that of reported so far in various acetone sensors based on metal oxide semiconductors(MOSs).Furthermore,first-principles calculations indicate that pre-adsorbed O formed on the surface of H_(2)O_(2)treated ZnO NPs can provide favorable adsorption energy,especially for acetone detection,due to strong bidentate bonding between carbonyl C atom of acetone molecules and pre-adsorbed O on the ZnO *** study demonstrates that controlling surface oxygen vacancies by H_(2)O_(2)treatment and re-annealing at optimal temperature is an effective method to improve the sensing properties of commercial MOS materials.

关键词： gas sensors acetone metal oxide semiconductors(MOSs) ZnO nanoparticles(NPs) H_(2)O_(2)treatment

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Experimental assessment of two-phase bubble pump for solar water heating

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Journal of Central South University 2012年第6期19卷 1590-1599页

作者： CHUNG Han-shik woo Ju-sik SHIN Yong-han KIM Jun-hyo jeong Hyo-min Institute of Marine Industry Department of Mechanical and Precision EngineeringGyeongsang National University445 Inpyeong DongTongyeongGyeongsangnamdo650-160Korea Department of Mechanical and Precision Engineering Gyeongsang National University445 Inpyeong DongTongyeongGyeongsangnamdo650-160Korea Division of Marine Engineering Mokpo National Maritime UniversityHaeyangdaehang-Ro 91Mokpo-siJeollanam-do530-729Korea

The research goal is to develop a new solar water heater system(SWHS) that uses a solar bubble pump instead of an electric *** pump is powered by the steam produced from an evacuated tube ***,heat could be transferred downward from the collector to a hot water storage *** designed system consists of two sets of heat-pipe evacuated tube collectors,a solar bubble pump installed at an upper level and a water storage tank with a heat exchanger at a lower *** heads of 1 and 5 m were *** bubble pump could operate at the collector temperature of about 90-100 ℃ and vapor gage pressure of 80-90 *** is found that water circulation within the SWHS depends on the incident solar intensity and system discharge *** investigations are conducted to obtain the system thermal efficiencies from the hourly,daily and long-term performance *** thermal performance of the proposed system is compared with conventional solar water *** results show that the proposed system achieves system characteristic efficiency of 10% higher than that of the conventional systems using electric pump if taking the consumption of electric power into *** the former is a zero carbon system.

关键词： two-phase bubble pump solar water heater system (SWHS) zero carbon

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Endoscopic ultrasound-guided biliary drainage with placement of a fully covered metal stent for malignant biliary obstruction

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World Journal of Gastroenterology 2012年第20期18卷 2526-2532页

作者： Tae Hyeon Kim Seong Hun Kim Hyo jeong Oh Young woo Sohn Seung Ok Lee Department of Internal Medicine School of MedicineWonkwang UniversityIksanChonbuk 570-749 South Korea Department of Internal Medicine Chonbuk National University Medical School and HospitalJeonjuChonbuk 561-712South Korea Department of Internal Medicine School of MedicineWonkwang UniversitySanbon Gyounggi 570-749South Korea

AIM:To determine the utility of endoscopic ultrasoundguided biliary drainage(EUS-BD)with a fully covered self-expandable metal stent for managing malignant biliary stricture. METHODS:We collected data from 13 patients who presented with malignant biliary obstruction and underwent EUS-BD with a nitinol fully covered selfexpandable metal stent when endoscopic retrograde cholangiopancreatography(ERCP)***-guided choledochoduodenostomy(EUS-CD)and EUS-guided hepaticogastrostomy(EUS-HG)was performed in 9 patients and 4 patients,respectively. RESULTS:The technical and functional success rate was 92.3%(12/13)and 91.7%(11/12),respectively. Using an intrahepatic approach(EUS-HG,n=4),there was mild peritonitis(n=1)and migration of the metal stent to the stomach(n=1).With an extrahepatic approach(EUS-CD,n=10),there was pneumoperitoneum(n=2),migration(n=2),and mild peritonitis (n=1).All patients were managed conservatively with *** follow-up(range,1-12 mo),there was re-intervention(4/13 cases,30.7%)necessitated by stent migration(n=2)and stent occlusion(n=2). CONCLUSION:EUS-BD with a nitinol fully covered self-expandable metal stent may be a feasible and effective treatment option in patients with malignant biliary obstruction when ERCP fails.

关键词： Endoscopic ultrasound-guided Biliary drainage Metal stent Biliary obstruction

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Gain enhancement of perovskite nanosheets by a patterned waveguide:excitation and temperature dependence of gain saturation

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Light(Science & Applications) 2023年第12期12卷 2688-2699页

作者： Inhong Kim Ga Eul Choi Ming Mei Min woo Kim Minju Kim Young woo Kwon Tae-In jeong Seungchul Kim Suck Won Hong Kwangseuk Kyhm Robert A.Taylor Department of Opto&Cogno Mechatronics Engineering RCDAMPPusan National UniversityBusan 46241Republic of Korea Department of Nano-Fusion Technology Pusan National UniversityBusan 46241Republic of Korea Clarendon Laboratory Department of PhysicsUniversity of OxfordOxford OX13PUUK

Optical gain enhancement of two-dimensional CsPbBr3 nanosheets was studied when the amplified spontaneous emission is guided by a patterned structure of *** the uncertainties and pitfalls in retrieving a gain coefficient from the variable stripe length method,a gain contour g((h))ω.x)was obtained in the plane of spectrum energy(hω)and stripe length(x),whereby an average gain was obtained,and gain saturation was *** and temperature dependence of the gain contour show that the waveguide enhances both gain and thermal stability due to the increased optical confinement and heat dissipation,and the gain origins were attributed to the two-dimensional excitons and the localized states.

关键词： waveguide saturation contour

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