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经脐单孔单支点腹腔镜胆囊切除术

中国内镜杂志 2013年第2期19卷 204-205页

作者：潘延涌陈本文胡寒竹耿兴聪史昌涛 lee woo-jung Kang Chang-moo 山东省即墨市人民医院山东即墨266200 Yonsei University

目的探讨经脐单孔单支点腹腔镜手术的可行性。方法总结分析2009年10月～2010年12月滨州医学院即墨医院肝胆外科和延世大学医学院胰胆中心完成的36例利用普通器械经脐单孔单支点腹腔镜胆囊切除术的手术方法及临床效果。结果 36例手术均... 详细信息

目的探讨经脐单孔单支点腹腔镜手术的可行性。方法总结分析2009年10月～2010年12月滨州医学院即墨医院肝胆外科和延世大学医学院胰胆中心完成的36例利用普通器械经脐单孔单支点腹腔镜胆囊切除术的手术方法及临床效果。结果 36例手术均获成功,无中转开腹或传统腹腔镜方法,无胆漏、切口感染等并发症。手术时间为25～90min,平均45min,术后平均住院时间2.5d。结论经脐单孔单支点腹腔镜胆囊切除术是安全可行的,术后腹壁瘢痕不明显,美容效果满意。但操作较常规腹腔镜手术难度大。

关键词：经脐单孔入路腔镜胆囊切除术单孔单支点常规器械

Aerodynamic design optimization of helicopter rotor blades including airfoil shape for hover performance

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Chinese Journal of Aeronautics 2013年第1期26卷 1-8页

作者： Ngoc Anh Vu Jae woo lee jung Il Shu Department of Aerospace Engineering Ho Chi Minh City University of Technology Department of Aerospace Information Engineering Konkuk University

This study proposes a process to obtain an optimal helicopter rotor blade shape for aerodynamic performance in hover flight. A new geometry representation algorithm which uses the class function/shape function transformation （CST） is employed to generate airfoil coordinates. With this approach, airfoil shape is considered in terms of design variables. The optimization process is constructed by integrating several programs developed by author. The design variables include twist, taper ratio, point of taper initiation, blade root chord, and coefficients of the airfoil distribution function. Aerodynamic constraints consist of limits on power available in hover and forward flight. The trim condition must be attainable. This paper considers rotor blade configuration for the hover flight condition only, so that the required power in hover is chosen as the objective function of the optimization problem. Sensitivity analysis of each design variable shows that airfoil shape has an important role in rotor performance. The optimum rotor blade reduces the required hover power by 7.4% and increases the figure of merit by 6.5%, which is a good improvement for rotor blade design.

关键词： Airfoil Design optimization Helicopter design Hover performance Planforms Rotor blades design

In situ infrared, Raman and X-ray spectroscopy for the mechanistic understanding of hydrogen evolution reaction

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Journal of Energy Chemistry 2024年第3期90卷 632-651,I0014页

作者： Andi Haryanto Kyounghoon jung Chan woo lee Dong-Wan Kim Department of Chemistry Kookmin UniversitySeoul 02707Republic of Korea School of Civil Environmental and Architectural EngineeringKorea UniversitySeoul 02841Republic of Korea

Hydrogen production by water reduction reactions has received considerable attention because hydrogen is considered a clean-energy carrier,key for a sustainable energy *** methods have been widely used to study the reaction mechanism of the hydrogen evolution reaction(HER),but the calculation results need to be supported by experimental results and direct evidence to confirm the mechanistic *** this review,we discuss the fundamental principles of the in situ spectroscopic strategy and a theoretical model for a mechanistic understanding of the *** addition,we investigate recent studies by in situ Fourier transform infrared(FTIR),Raman spectroscopy,and X-ray absorption spectroscopy(XAS) and cover new findings that occur at the catalyst-electrolyte interface during *** spectroscopic strategies provide practical ways to elucidate catalyst phase,reaction intermediate,catalyst-electrolyte interface,intermediate binding energy,metal valency state,and coordination environment during HER.

关键词： Hydrogen evolution reaction Infrared spectroscopy Raman spectroscopy X-ray absorption spectroscopy Reaction mechanism

Effective parameters on diameter of carbon nanotubes by plasma enhanced chemical vapor deposition

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中国有色金属学会会刊：英文版 2012年第S3期22卷 712-716页

作者： Kang Young JEONG Hyun Kyung jung Hyung woo lee National Core Research Center for Hybrid Materials Solution Hybrid Graduate SchoolPusan National University Department of Diagnostic Radiology Inje University College of MedicineHaeundae Paik Hospital

The effective parameters on the diameter of carbon nanotubes (CNTs) by plasma enhanced chemical vapor deposition (PECVD) were *** lots of influential parameters,the effects of the catalytic film thickness and the pretreatment plasma power on the growth of CNTs were *** results show that the size of catalytic islands increases by increasing the thickness of catalytic layer,but the density of CNTs *** pretreatment duration time of 30 s is the optimal condition for growing CNTs with about 50 nm in *** increasing the pretreatment plasma power,the diameter of CNTs decreases ***,the diameter of CNTs does not change drastically from 80 to 120 *** uniformly grown CNTs with the diameter of 50 nm are obtained at the pretreatment plasma power of 100 W.

关键词： carbon nanotubes catalytic film thickness pretreatment plasma power plasma enhanced chemical vapor deposition

Attaching single carbon nanotube on tip's apex using dielectrophoresis of DC-pulse voltage

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中国有色金属学会会刊：英文版 2009年第B09期19卷 280-283页

作者： Hee-Jin JEONG Yoong-Ho jung Deug-woo lee Gyeongbuk Hybrid Technology Institute School of Mechanical Engineering Pusan National University Department of Nanosystem and Nanoprocess Engineering Pusan National University

Single carbon nanotubes (CNTs) are candidates for a number of electronics and sensing applications, provided that single CNTs can be separated from a bundle of CNTs in suspension. Dielectrophoresis has recently been demonstrated as one route for the extraction of desired CNTs. However, previous methods using dielectrophoresis have found it difficult to extract single nanotubes from bundles of CNTs in solution. Here, we show that this restriction can be overcome by using pulsed DC voltage of an electric field, instead of regular AC and DC voltages.

关键词：碳纳米管直流脉冲脉冲电压介电顶点消息电子号码 CNTs

Minimally invasive radical pancreatectomy for left-sided pancreatic cancer:Current status and future perspectives

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World Journal of Gastroenterology 2014年第9期20卷 2343-2351页

作者： Chang Moo Kang Sung Hwan lee woo jung lee Department of Surgery Yonsei University College of Medicine Seoul 120-752 South Korea Pancreaticobiliary Cancer Clinic Institute of Gastroenterology Severance Hospital Seoul 120-752 South Korea

Minimally invasive distal pancreatectomy with splenectomy has been regarded as a safe and effective treatment for benign and borderline malignant pancreatic ***,its application for left-sided pancreatic cancer is still being *** clinical evidence for radical antegrade modular pancreatosplenectomy(RAMPS)-based minimally invasive approaches for leftsided pancreatic cancer was *** indications and surgical concepts for minimally invasive RAMPS were *** the limited clinical evidence for minimally invasive distal pancreatectomy in left-sided pancreatic cancer,the currently available clinical evidence supports the use of laparoscopic distal pancreatectomy under oncologic principles in wellselected left sided pancreatic cancers.A pancreasconfined tumor with an intact fascia layer between the pancreas and left adrenal gland/kidney positioned more than 1 or 2 cm away from the celiac axis is thought to constitute a good condition for the use of margin-negative minimally invasive *** use of minimally invasive(laparoscopic or robotic)anterior RAMPS is feasible and safe for margin-negative resection in wellselected left-sided pancreatic *** oncologic feasibility of the procedure remains to be determined;however,the currently available interim results indicate that even oncologic outcomes will not be inferior to those of open radical distal pancreatosplenectomy.

关键词： Pancreatic cancer Laparoscopic pancreatectomy Robotic pancreatectomy

Origin of the giant persistent photoconductivity in LaAlO_(3)/SrTiO_(3)heterostructures probed by noise spectroscopy

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Journal of Materials Science & Technology 2023年第6期137卷 152-158页

作者： Kitae Eom jung-woo lee Gyeongmo Yang Youngmin Kim Jaeyoung Jeon Jieun Yeon Hyungwoo lee School of Advanced Materials Science and Engineering Sungkyunkwan University(SKKU)Suwon 16419South Korea KIURI Institute Yonsei UniversitySeoul 03722South Korea Department of Physics Ajou UniversitySuwon 16499South Korea Department of Energy Systems Research Ajou UniversitySuwon 16499South Korea

LaAlO_(3)/SrTiO_(3)(LAO/STO)heterostructures have shown a strong persistent photoconductivity(PPC)at room *** abnormally strong PPC has attracted immense research interest due to its possible applications in optically-tunable electronic *** its promise,the fundamental understanding of the PPC in the LAO/STO heterostructures is still ***,we report that the giant PPC origi-nates from the photo-induced valence change in oxygen vacancies near the LAO/STO *** spec-tral analysis of the photocurrent and the model-fitting study consistently show that the ionized oxygen vacancies near the interface are neutralized during the electron relaxation *** hinder the complete relaxation of the photoexcited electrons by the deeply-located oxygen vacancies and result in the strong *** change in the ionization state distribution of the oxygen vacancies is probed by the per-sistent noise behavior at the frequency between 1 kHz and 20 kHz *** results provide insight into the role of oxygen vacancies in influencing the internal charge distribution and triggering the PPC phenomena in complex oxide heterostructures.

关键词： Persistent photoconductivity LaAlO_(3)/SrTiO_(3)heterostructures Two-dimensional electron gases Oxygen vacancies Low-frequency noise Spectral analyses

Synergistic Effect of Core/Shell‑Structured Composite Fibers:Efficient Recovery of Rare‑Earth Elements from Spent NdFeB Permanent Magnets

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Advanced Fiber Materials 2024年第6期6卷 1729-1745页

作者： Youngkyun jung Yun lee Su‑Jin Yoon Jae‑woo Choi Center for Water Cycle Research Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Chemical and Biological Engineering Korea UniversitySeoul 02841Republic of Korea Department of Energy and Environment Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea

NdFeB magnets are third-generation permanent magnets that are employed as indispensable components in various ***,rare-earth elements(REEs)such as Dy and Nd must be efficiently recovered from end-of-life magnets to enable resource circulation and reinforce unstable supply *** that end,this paper reports synergistically performing core/shell-structured composite fibers(CSCFs)containing sodium polyacrylate and nanoporous zeolitic imidazolate framework-8(NPZIF-8)nanocrystals as a readily recoverable adsorbent with an exceptional REE-adsorbing *** CSCF core forms an NPZIF-8 nanocrystal shell on the fiber surface as well as draws REEs using its dense sodium carboxylate groups into the NPZIF-8 nanocrystal lattice with high specific surface *** CSCFs exhibit significantly higher maximum adsorption capacities(468.60 and 435.13 mg·g-1)and kinetic rate constants(2.02 and 1.92 min-1)for the Nd3+and Dy3+REEs than those of previously reported REE ***,the simple application of the CSCFs to an adsorption reactor considerably mitigates the adsorbent-shape-induced pressure drop,thereby directly influencing the energy efficiency of the ***,the high REE-recovery ability,tractability,and recyclability of the CSCFs offers a pragmatic pathway to achieving cost-effective REE ***,this study provides new insights into designing synergistically performing core/shell architectures for feasible REE recovery.

关键词： Core/shell structures Fibrous adsorbents Synergistic adsorption Metal resource recovery Pressure drop Rare-earth elements

^(27)Al MAS-NMR study of inorganic polymer formation at ambient temperature

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Transactions of Nonferrous Metals Society of China 2011年第A01期21卷 182-187页

作者： Sang-wook AHN Hee-Soo lee Wan-Hee YANG jung-woo lee Young-Keun JEONG National Core Research Center for Hybrid Materials Solution Pusan National University School of Material Science and Engineering Pusan National University INTChem Co. Ltd.

Inorganic polymers are a novel class of materials formed by the polymerization of silicon, aluminium and oxygen species to form an amorphous three-dimensional framework structure. The basis of this process is the alkaline solutions to induce a certain amount of Si and AI atoms to dissolve from a feedstock such as aluminosilicate. A study of 27A1 MAS-NMR was carried out in an attempt to understand the reaction mechanism of the inorganic polymerization at ambient temperature. Scanning electron microscopy （SEM） and X-ray diflYactometry （XRD） were also employed to establish the composition and microstructure of the inorganic polymerization. Specimens were prepared with different A1/Si mole ratios from the starting materials. The higher the AI content, the more sufficient the AI atoms that can combine with SiO4, and the longer the reaction time, the more the bonded Si--O--A1--O polymer structure, and then the higher the A1 content, the fewer the octahedral A1 with a uniform Si--O--A1--O structure in four directions, because four AI atoms are combined with SiO4, resulting in a uniform Si--O--AI--O structure in four directions. The results show that they have an amorphous microstructure.

关键词： inorganic polymer amorphous tetrahedral