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Optimization of Pyrolysis Properties using TGA and Cone Calorimeter Test

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Journal of Thermal Science 2013年第2期22卷 168-173页

作者： Won-Hee park kyung-Beom Yoon Eco-Transport Systems Research Division Korea Railroad Research Institute Department of Mechanical Engineering Chung-Ang University

The present paper describes an optimization work to obtain the properties related to a pyrolysis process in the solid material such as density, specific heat, conductivity of virgin and char, heat of pyrolysis and kinetic parameters used for deciding pyrolysis rate. A repulsive particle swarm optimization algorithm is used to obtain the pyrolysis-related properties. In the previous study all properties obtained only using a cone calorimeter but in this paper both the cone calorimeter and thermo gravimetric analysis (TGA) are used for precisely optimizing the pyrolysis properties. In the TGA test a very small mass is heated up and conduction and heat capacity in the specimen is negligible so kinetic parameters can first be optimized. Other pyrolysis-related properties such as virgin/char specific heat and conductivity and char density are also optimized in the cone calorimeter test with the already decided parameters in the TGA test.

关键词： Pyrolysis properties Thermogravimetric analysis Cone calorimeter Repulsive particle swarmoptimization

FET-based nanobiosensors for the detection of smell and taste

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Science China(Life Sciences) 2020年第8期63卷 1159-1167页

作者： Dongseok Moon Yeon kyung Cha So-ong Kim Seongyeon Cho Hwi Jin Ko Tai hyun park School of Chemical and Biological Engineering Institute of Chemical ProcessesSeoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Program for Bioengineering Seoul National UniversitySeoul 08826Republic of Korea

Various nanobiosensors composed of biomaterials and nanomaterials have been developed,due to their demonstrated advantage of showing high *** various biomaterials for biological recognition elements of the nanobiosensor,sensory receptors,such as olfactory and taste receptors,are promising biomaterials for developing nanobiosensors,because of their high selectivity to target ***-effect transistors(FET)with nanomaterials such as carbon nanotube(CNT),graphene,and conducting polymer nanotube(CPNT),can be combined with the biomaterials to enhance the sensitivity of ***,many efforts have been made to develop nanobiosensors using biomaterials,such as olfactory receptors and taste receptors for detecting various smells and *** review focuses on the biomaterials and nanomaterials used in nanobiosensor systems and studies of various types of nanobiosensor platforms that utilize olfactory receptors and taste receptors which could be applied to a wide range of industrial fields,including the food and beverage industry,environmental monitoring,the biomedical field,and anti-terrorism.

关键词： nanobiosensor olfactory receptor taste receptor field-effect transistor(FET)

Mechanisms of fibrogenesis in liver cirrhosis:The molecular aspects of epithelial-mesenchymal transition

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World Journal of Hepatology 2014年第4期6卷 207-216页

作者： Sun-Jae Lee kyung-hyun Kim Kwan-Kyu park Department of Pathology Catholic University of DaeguCollege of Medicine

Liver injuries are repaired by fibrosis and *** cause of fibrosis and diminished regeneration,especially in liver cirrhosis,is still *** transition(EMT) has been found to be associated with liver *** possibility that EMT could contribute to hepatic fibrogenesis reinforced the concept that activated hepatic stellate cells are not the only key players in the hepatic fibrogenic process and that other cell types,either hepatic or bone marrow-derived cells could contribute to this *** an initial enthusiasm for the discovery of this novel pathway in fibrogenesis,more recent research has started to cast serious doubts upon the real relevance of this phenomenon in human fibrogenetic *** debate on the authenticity of EMT or on its contribution to the fibrogenic process has become very *** overall result is a general confusion on the meaning and on the definition of several key *** aim of this article is to describe how EMT participates to hepatic fibrosis and discuss the evidence of supporting this possibility in order to reach reasonable and useful conclusions.

关键词： Epithelial-mesenchymal transition Liver Fibrosis Transforming growth factor-beta1 Biological markers

Effect of Fe_2P in LiFePO_4/Fe_2P composite on electrochemical properties synthesized by MA and control of heat condition

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Rare Metals 2006年第Z2期25卷 179-183页

作者： park Jong Suk LEE kyung Tae LEE kyung Sub Department of Material Science and Engineering Hanyang University Seoul 133-731 Korea

In order to control the size and distribution of the high conductive Fe2P in LiFePO4/Fe2P composite, two different cooling rates (Fast: 15 ℃·min-1, Slow: 2 ℃·min-1) were employed after mechanical alloying. The discharge capacity of the fast cooled was 83 mAh·g-1 and the slow cooled 121 mAh·g-1. The particle size of the synthesized powder was examined by transmission electron microscopy and distribution of Fe2P was characterized using scanning electron microscopy (SEM). In addition, two-step heat treatment was carried out for better distribution of Fe2P. X-ray diffraction (XRD) and Rietveld refinement reveal that LiFePO4/Fe2P composite consists of 95.77% LiFePO4 and 4.33% of Fe2P.

关键词： LiFePO4/Fe2P composite mechanical alloying heat treatment discharge capacity

Prediction of the indication criteria for endoscopic resection of early gastric cancer

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World Journal of Gastroenterology 2015年第39期21卷 11160-11167页

作者： Jae hyun park Si hyung Lee Joon Mo park Chan Seo park kyung Sik park Eun Soo Kim Kwang Bum Cho Department of Internal Medicine Yeungnam University College of Medicine Department of Internal Medicine Keimyung University College of Medicine

AIM: To find risk factors of lymph node metastasis(LNM) in early gastric cancer(EGC) and to find proper endoscopic therapy indication in ***: We retrospectively reviewed the 2270 patients who underwent curative operation for EGC from January 2001 to December 2008. EGC was defined as malignant lesions that do not invade beyond the submucosal layer of the stomach wall irrespective of presence of lymph node ***: Among 2270 enrolled patients, LNM was observed in 217(9%) patients. LNM in intramucosal(M) cancer and submucosal(SM) cancer was detectedin 3 8( 2. 8 %, 3 8 / 1 3 4 0) patients and 1 7 9(19%, 179/930) patients, respectively. In univariate analysis, the risk factors for LNM in EGC were size of tumor, Lauren classification, ulcer, lymphatic invasion, vascular invasion, and depth of invasion. However, in multivariate analysis, size of tumor, lymphatic invasion, vascular invasion, and depth of invasion were risk factors for LNM in EGC. Size of tumor, lymphatic invasion, vascular invasion, and depth of invasion were risk factors for LNM in cases of intramucosal cancer and submucosal cancer. In particular, there was no lymph node metastasis in cases of well differentiated early gastric cancer below 1 cm in size without ulcer regardless of lymphovascular ***: Tumor size, perilymphatic-vascular invasion, and depth of invasion were risk factors for LNM in EGC. There was no LNM in EGC below 1 cmregardless risk factors.

关键词： Early gastric cancer Lymph node metastasis Endosco

The effectiveness of emotion-focused art therapy on the resilience and self-image of emergency physicians

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World Journal of Emergency Medicine 2022年第6期13卷 479-484页

作者： Soo kyung Eo Chanwoong Kim kyung Hye park Eun kyung Eo Graduate School of Art Therapy at CHA University Pocheon 11160Republic of Korea Department of Emergency Medicine Chung-Ang University College of MedicineSeoul 06974Republic of Korea Department of Medical Education Yonsei University Wonju College of MedicineWonju 26426Republic of Korea Department of Emergency Medicine Wonju Severance Christian HospitalWonju 26426Republic of Korea Department of Emergency Medicine Soonchunhyang University Bucheon HospitalBucheon 14584Republic of Korea

INTRODUCTION Resilience refers to the quality of being able to overcome adversity.[1]Studies conducted in the United States[2]and China[3]following the 2019 coronavirus disease(COVID-19)pandemic reported reduced resilience levels among medical *** resilience levels are associated with low burnout levels among residents.[4]Physician burnout affects patients’safety and quality of care.[5]In particular,emergency physicians(EPs)are more prone to exhaustion or poor resilience,as their turnover intention tends to be higher.[6]Therefore,improving EPs’resilience is imperative.

关键词： image physician overcome

Metal stents placement for refractory pancreatic duct stricture in children

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World Journal of Gastroenterology 2018年第3期24卷 408-414页

作者： In Sook Jeong Sung Hee Lee Seak Hee Oh Do hyun park kyung Mo Kim Department of Pediatrics University of Ulsan College of MedicineAsan Medical Center Children’s Hospital Department of Internal Medicine University of Ulsan College of MedicineAsan Medical Center

AIM To evaluate the use of fully covered self-expandable metal stents(FCSEMSs) for pancreatic duct strictures in children with chronic *** Eight patients with refractory benign dominant stricture of the main pancreatic duct(MPD) were enrolled through chart reviews between December 2014 and June 2017 in a single center. Endoscopic retrograde cholangiopancreatography(ERCP) with placement of a 6-mm FCSEMS with dual flaps was performed. Endoscopic removal of FCSEMSs was performed with a snare or rat-tooth forceps. All procedures were performed by a pediatric gastroenterologist. For the assessment of outcomes, technical and clinical success, adverse events, and stent patency were evaluated *** The placement and removal of the FCSEMSs were successful in all 8 patients. Five patients were boys and 3 were girls. The median age at initial FCSEMS placement was 12 years(range, 5-18 years). The diameters of all the inserted stents were 6 mm, and the lengths were 4-7 cm. The median indwelling time was 6 mo(range, 3-10 mo). No pancreatic sepsis, pancreatitis, cholestasis, or mortality occurred. There was no proximal and distal migration. All subjects showed a patent stent. On follow-up ERCP, the mean diameter of the stricture improved from 1.1 mm to 2.8 mm(P < 0.05), whereas that of upstream dilation improved from 8.4 mm to 6.3 mm(P < 0.05).CONCLUSION This initial experience showed that temporary FCSEMS placement is feasible and safe for the management of refractory benign MPD stricture in children.

关键词： Chronic pancreatitis Pancreatic duct Selfexpandable metal stent Child Endoscopic retrograde cholangiopancreatography

Improvement of machining quality of copper-plated roll mold by controlling temperature variation

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 37-41页

作者： Tae-Jin JE Eun-Chae JEON Sang-Cheon park Doo-Sun CHOI kyung-hyun WHANG Myung-Chang KANG Division of Nano-Mechanical Systems Korea Institute of Machinery and Materials Daejeon 305-343 Korea National Core Research Center for Hybrid Materials Solution Pusan National University

Micro prism film used in LCD industry can be manufactured by roll to roll method with copper-plated roll mold. As copper-plated roll mold is getting larger, pitch error is getting severer. The pitch error drops the quality of micro prism film. The main cause of the pitch error was investigated during machining large roll mold whose machined length was 1 200 mm. The temperature of machining system was elevated during machining roll mold, and this elevation induced thermal expansion of the system. The temperature variation around the roll mold also made thermal expansion of the roll mold. The amount of thermal expansion had strong relationship to the amount of pitch error. Therefore, the roll mold was machined after warming-up of machining system and precise temperature controller around copper-plated roll mold was installed, which minimized the temperature variation. Finally, precise micro prism patterns without pitch error were machined on the large roll mold.

关键词： copper-plated roll mold machining prism pattern temperature variation

Fabrication and characterization of 3D scaffold using 3D plotting system

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Chinese Science Bulletin 2010年第1期55卷 94-98页

作者： LEE Jun-Hee park Su-A park KoEun KIM Jae-hyun KIM kyung-Shik LEE Jihye Kim WanDoo Bio-Mechatronics Team Division of Nano-Machinery Korea Institute of Machinery and Materials (KIMM) Nano-Mechanics Team Division of Nano-Machinery Korea Institute of Machinery and Materials (KIMM) Nano-Mechatronics Team Division of Nano-Machinery Korea Institute of Machinery and Materials (KIMM)

In this paper, we design and fabricate a 3D scaffold using rapid prototyping (RP) technology for tissue engineering. The scaffold should have a three-dimensional interconnected pore network. We fabricate a polycaprolactone (PCL) scaffold with interconnecting pores and uniform porosity for cell ingrowth using a 3D plotting system. In order to keep the three dimensional shape under mechanical loading while implanted, we design an oscillating nozzle system to increase elastic modulus and yield strength of PCL strand. We characterize the influence of pore geometry, compressive modulus of the scaffold, elastic modulus and yield strength of the strand using SEM, dynamical mechanical analysis (DMA) and Nano-UTM. Finally the cell responses on scaffolds are observed.

关键词：三维形状绘图系统表征支架制作动态机械分析弹性模量细胞反应