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Development and Experimental Evaluation of Strip Shape Prediction Model for Sendzimir Rolling Mills

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Journal of Iron and Steel Research International 2013年第12期20卷 25-32页

作者： SHIN Jong-min HAN seong-ik KIM Jong-shik School of Mechanical Engineering Pusan National University School of Electrical Engineering Pusan National University

It is difficult to obtain the desired strip shape using Sendzimir rolling mills because small diameter work rolls can be easily deformed by the roiling force. To control the strip shape effectively, it is important to understand the relationship between the behavior of the shape actuator and the variation of the strip shape. A numerical model based on the contact element method was proposed for the prediction of strip shape. In this numerical model, the re- lationships between the actuating forces, the roll deflections, the thickness profiles of the entry and exit sides, and the strip shape were considered. The proposed numerical model for strip shape prediction was evaluated by computer simulation and experiment with respect to various AS-U roll and first intermediate roll positions.

关键词： Sendzimir rollingmill double acting AS-U roll strip shape prediction model contact element method

Improvement of Shape Recognition Performance of Sendzimir Mill Control Systems Using Echo State Neural Networks

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Journal of Iron and Steel Research International 2014年第3期21卷 321-327页

作者： Jung-hyun PARK seong-ik HAN Jong-shik KIM School of Mechanical Engineering Pusan National University School of Electrical Engineering Pusan National University

High rigidity twenty-high Sendzimir mills （ZRMs） are widely used for rolling stainless steels, silicon sheets, etc. A ZRM uses a small diameter work roll to produce massive rolling forces. Since a work roll with a small diameter can be bent easily, strips often have complex shapes with mixed quarter and deep edge waves in the shape of plates. In order to solve this problem, fuzzy neural network controls are generally used for shape： recognition in ZRM control systems. Among various neural network types, the multi-layer perceptron （MLP） is typically used in current ZRMs. However, an MLP causes the loss of a large amount of shape recognition data. To improve the shape recognition per- formance of ZRM control systems, echo state networks （ESNs） are proposed to be used. Through simulation re- sults, it is found that shape recognition performance could be improved using the proposed ESN method.

关键词： Sendzimir mill neural network multi-layer perceptron echo state network shape recognition

Analysis of Quenching Resistor Effect to Improve Stability of TIA Circuit for APD-A Secondary Publication

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Journal of Electronic Research and Application 2024年第2期8卷 54-61页

作者： Dong-Han Ki Yu-Rin Jin Sung-Mi Kim seong-ik Cho Department of Electronics Engineering Jeonbuk National UniversityJeollabuk-doRepublic of Korea

In this paper,since the Avalanche Photo Diode(APD)for Light-to-Voltage LTV conversion uses a high voltage in the operating range unlike other Photo Diodes(PD),the quenching resistor must be connected in series to prevent overcurrent when using the Transimpedance Amplifier(TIA).In such a case,quenching resistance may affect the transfer function of the TIA circuit,resulting in serious ***,in this paper,by analyzing the effect of APD quenching resistance on the voltage and current loop transfer function of TIA,we proposed a loop analysis and a method for determining the quenching resistance value to improve stability.A TIA circuit with quenching resistance was designed by the proposed method and its operational stability was verified through simulation and chip fabrication.

关键词： APD TIA Quenching resistor Stability Transfer function

Microbiology and risk factors for gram-positive Cocci bacteremia in biliary infections

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Hepatobiliary & Pancreatic Diseases International 2020年第5期19卷 461-466页

作者： ik Hyun Jo Yeon-Ji Kim Woo Chul Chung Jaeyoung Kim Seonhoo Kim Eun Sun Lim Honggeun Ahn seong Yul Ryu Division of Gastroenterology Department of Internal MedicineSt.Vincent’s HospitalCollege of MedicineThe Catholic University of KoreaSuwon 16247Korea

Background:The rapid antibiotics treatment targeted to a specific pathogen can improve clinical outcomes of *** aimed to evaluate the clinical characteristics and outcomes of biliary septicemia caused by cholangitis or cholecystitis according to causative ***:We performed a retrospective cohort study in 151 patients diagnosed with cholangitis or cholecystitis with bacterial septicemia from January 2013 to December *** patients showed clinical evidence of biliary tract infection and had blood isolates that demonstrated ***:Gram-negative,gram-positive,and both types of bacteria caused 84.1%(127/151),13.2%(20/151),and 2.6%(4/151)episodes of septicemia,*** most common infecting organisms were Escherichia coli among gram-negative bacteria and Enterococcus species(Enterococcus casseliflavus and Enterococcus faecalis)among gram-positive *** were no differences in mortality,re-admission rate,and need for emergency decompression procedures between the gram-positive and gram-negative septicemia *** univariate analysis,previous gastrectomy history was associated with gram-positive *** analysis also showed that previous gastrectomy history was strongly associated with gram-positive septicemia(Odds ratio=5.47,95%CI:1.19–25.23;P=0.029).Conclusions:Previous gastrectomy history was related to biliary septicemia induced by gram-positive *** information would aid the choice of empirical antibiotics.

关键词： Cholangitis Cholecystitis Septicemia Gram-positive bacterial infections

Usefulness of magnifying endoscopy for iodine-unstained lesions in a high-risk esophageal cancer population

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World Journal of Gastroenterology 2010年第37期16卷 4709-4715页

作者： ik seong Choi Jae Young Jang Won Young Cho Tae Hee Lee Hyun Gun Kim Bo Young Lee Soung Won jeong Joo Young Cho Joon seong Lee So Young Jin Institute for Digestive Research SoonChunHyang University College of Medicine

AIM: To investigate the usefulness of magnified observations of iodine-unstained esophageal lesions in the histological diagnosis of esophageal mucosa abnormalities, in high-risk esophageal cancer groups. METHODS: The subjects included 38 patients who had at least one of the four criteria known to be highrisk factors for esophageal cancer. Following endoscopic observation, magnified observations were performed on iodine-unstained lesions of the esophagus. The total number of lesions was 43. These lesions were classified as type A (clear papilla), type B (fused papilla), and type C (non-visible papilla) according to the findings. Tissue biopsy was then carried out. Finally the histological findings were graded in terms of histological factors, and their relationships were compared. RESULTS: Of the 43 lesions, 11 were type A, 17 were type B, and 15 were type C under magnifying endoscopy. Histological findings such as inflammatory cell infiltration and basal cell hyperplasia were significantly increased in type B and type C lesions compared with type A lesions (P < 0.05). Low-grade esophageal dysplasia was apparent in 1 (9%) of 11 type A lesions, in 3 (18%) of 17 type B lesions, and in 6 (40%) of 15 type C lesions, with the highest rate in type C. CONCLUSION: Magnified observations of the esophagus, classified by papillary aspects using magnifying endoscopy of iodine-unstained lesions in high-risk esophageal cancer groups, are considered useful in estimating dysplasia and inflammation of esophageal mucosa.

关键词： Esophageal cancer Iodine Magnifying endoscopy

Effect of Korean red ginseng on blood pressure and nitric oxide production

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Acta Pharmacologica Sinica 2000年第12期 40-45页

作者： jeon Byeong Hwa,KIM Cuk seong,KIM Hoe-Suk,PARK Jin-Bong,NAM Ki Yeul,CHANG Seok Jong Department of Physiology College of Medicine Chungnam National University Taejon Korea Department of Physiology College of Medicine Chungnam National University Taejon Korea Department of Physiology College of Medicine Chungnam National University Taejon Korea Department of Physiology College of Medicine Chungnam National University Taejon Korea Korea Ginseng & Tobacco Research Institute Taejon Korea Department of Physiology College of Medicine Seonam University Namwon Korea

AIM: To investigate the effect of crude saponin and non-saponin fraction of Korean red ginseng (KRG) on the blood pressure and nitric oxide (NO) production in the conscious rats and cultured endothelial cell line, ECV 304 cells. METHODS: Systolic blood pressure and heart rate were monitored in the conscious rats. Nitric oxide levels and the expression of nitric oxide synthase were measured by a spectrophotometric assay using Griess reagents and Western blotting, respectively. Nitric-oxide synthase activity was measured based on the conversion rate of [3H]arginine to [3H]citrulline. RESULTS: Systolic blood pressure was decreased by crude saponin (100 mg/kg, iv) of KRG in the conscious control and one-kidney, one-clip Goldblatt hypertensive (ik, 1C-GBH) rats. The hypotensive effect induced by crude saponin of KRG reached maximum at 2 - 4 min and slowly recovered after 20 min to the initial level in both groups. Crude saponin of KRG induced tachycardia in the conscious rats but induced bradycardia in the a

关键词： Korean red ginseng saponins saponin-free fraction nitric oxide hypertension antihy-pertensive

Dynamic Friction Control Using Dynamic Structured RFNN and Friction Parameter Estimator

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Journal of Measurement Science and Instrumentation 2011年第2期2卷 191-194页

作者： seong-ik HAN Kwon-soon LEE Dae-yeon YEO Sang-ok HAN Kyung-wan KOO Dept. of Electrical Engineering Dong-A Univsersity Busan 604-714 Korea Dept. of Electrical Engineering Chungnam National University Cheonan 305- 764 Korea Dept. of Defense Science of Technology Hoseo University Cheonan 330-713 Korea

A nonlinear dynamic friction control is dealt with using dynamic friction observer and intelligent cantrol. The adaptive dynamic friction obsrver based on the LuGre friction is proposed to estimate the friction parameters and a directly friction state variable The dynamic structured Fuzzy Neural Network （RFNN） is designed to give additional robustness to the cantrol system under the presence of the friction model uncertainty. A proposed composite cantrol scheme is applied to the position tracking control of the servo systen. The performances of the proposed friction observer and the friction controller are demonstrated by simulation.

关键词： LuGre friction model adaptive friction observer dynamic structured RFNN servo system control

Specific Radius Change of Quantum Dot inside the Lipid Bilayer by Charge Effect of Lipid Head-Group

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Open Journal of Biophysics 2018年第3期8卷 163-175页

作者： Soon Ki Sung Hyuk Kyu Pak Jong Hyeok Kwak Sang Weon Lee Young Ha Kim Beong ik Hur seong Jin Jin Gyeong Rip Kim Department of Neurosurgery Pusan National University Yang-san Hospital Yang-san Korea Research Institute for Convergence of Biomedical Science and Technology Yang-san Korea Department of Physics Ulsan National Institute of Science and Technology Ulsan Korea Department of Radiology Pusan National University Yang-san Hospital Yang-san Korea Department of Neurosurgery Pusan National University Hospital Busan Korea Haeundae Paik Hospital Busan Korea

We studied the quantum dot-liposome complex (QLC), which is the giant unilamellar vesicle with quantum dots (QDs) incorporated in its lipid bilayer. A spin coating method in conjunction with the electroformation technique yielded vesicles with highly homogeneous unilamellar structure. We observed QD size dependence of the QLC formation: QLCs form with blue, green and yellow-emission QD (core radius ~1.05 nm, 1.25 nm and 1.65 nm) but not with red-emission QD (core radius ~2.5 nm). In order to explain this size dependence, we made a simple model explaining the QD size effect on QLC formation in terms of the molecular packing parameter and the lipid conformational change. This model predicts that QDs below a certain critical size (radius ≈ 1.8 nm) can stably reside in a lipid bilayer of 4 - 5 nm in thickness for Egg-PC lipids. This is consistent with our previous experimental results. In the case of red-emission QD, QD-aggregations are only observed on the fluorescent microscopy instead of QLC. We expected that the reduction of packing parameter (P) would lead to the change of specific QD radius. This prediction could be verified by our experimental observation of the shift of the specific QD size by mixing DOPG.

关键词： Quantum Dot-Liposome Complexes (QLCs) The Interface Energy at Optical Head Area Packing Parameter DOPC/DOPG QLC

Significant risk and associated factors of active tuberculosis infection in Korean patients with inflammatory bowel disease using anti-TNF agents

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World Journal of Gastroenterology 2015年第11期21卷 3308-3316页

作者： Eun Soo Kim Geun Am Song Kwang Bum Cho Kyung Sik Park Kyeong Ok Kim Byung ik Jang Eun Young Kim seong Woo jeon Hyun Seok Lee Chang Heon Yang Yong Kook Lee Dong Wook Lee Sung Kook Kim Tae Oh Kim Jonghun Lee Hyung Wook Kim Sam Ryong Jee Seun Ja Park Hyun Jin Kim Division of Gastroenterology Department of Internal MedicineKeimyung University School of Medicine Division of Gastroenterology Department of Internal MedicinePusan National University School of Medicine Division of Gastroenterology Department of Internal MedicineYeungnam University College of Medicine Division of Gastroenterology Department of Internal MedicineCatholic University of Daegu School of Medicine Division of Gastroenterology Department of Internal MedicineKyungpook National University School of Medicine Division of Gastroenterology Department of Internal MedicineDongguk University School of Medicine Division of Gastroenterology Department of Internal MedicineInje University College of Medicine Division of Gastroenterology Department of Internal MedicineDong-A University Medical Center Division of Gastroenterology Department of Internal MedicineKosin University College of Medicine Division of Gastroenterology Department of Internal MedicineGyeongsang National University School of Medicine

AIM:To evaluate the incidence and risk factors of Korean tuberculosis(TB) infection in patients with inflammatory bowel disease(IBD) undergoing anti-TNF ***:The data of IBD patients treated with anti-TNFs in 13 tertiary referral hospitals located in the southeastern region of Korea were collected *** failed to show response or were intolerant to conventional treatments,including steroids or *** measures for latent TB infection(LTBI)and the incidence and risk factors ofactive TB infection after treatment with anti-TNFs were ***:Overall,376 IBD patients treated with antiTNF agents were recruited(male 255,mean age of anti-TNF therapy 32.5±13.0 years);277 had Crohn’s disease,99 had ulcerative colitis,294 used infliximab,and 82 used *** anti-TNF treatment,screening tests for LTBI including an interferon gamma release assay or a tuberculin skin test were performed in 82.2%of *** patients(8%)had *** cases of active TB infection including one TB-related mortality occurred during 801 personyears(PY)follow-up(1997.4 cases per 100000 PY)after anti-TNF ***(OR=5.76,95%CI:1.57-21.20,P=0.008)and WBC count<5000 mm3(OR=4.5,95%CI:1.51-13.44,P=0.007)during follow-up were identified as independently associated risk ***:Anti-TNFs significantly increase the risk of TB infection in Korean patients with *** considerable burden of TB and marked immunosuppression might be attributed to this risk.

关键词： Tuberculosis Anti-TNF Korea Inflammatory bowel dis