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A Kinetic Study on the Control of Nitrogen in Molten Slag and Metal

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Journal of Iron and Steel Research International 2011年第S2期18卷 301-309页

作者： seung min HAN Dong Joon min Technical Research Laboratories POSCO Pohang 790-785 KOREA Department of Materials Science and Engineering YONSEI University Seoul 120-749 KOREA

Nitrogen can easily contaminate molten steel during the steelmaking process and due to the low nitrogen capacity in slag, it is difficult to remove entrapped nitrogen from liquid steel. Degassing is often done to the steel at secondary steelmaking to lower the nitrogen content, but the control can often be kinetically limited by the steel grade and also the slag composition. Thus, a fundamental understanding of nitrogen dissolution into molten slag and metal including the rate of nitrogen dissolution can help in controlling nitrogen content in the final *** kinetics of nitrogen dissolution in the molten calcium aluminate based slags and in molten steel with various element additions was investigated by measuring the 14N-15N isotope exchange reaction using a mass spectrometer at 1873 *** show that effect of elements on the rate constant of nitrogen dissolution such as Ni in Fe is relatively minimal similar to molybdenum. The surface rate constant of nitrogen dissolution in liquid Fe-10%Ni alloy was found to be 3.77×10-5 (mol/cm2·s·atm).The rate constant of nitrogen dissolution in the CaO-Al2O3-CaF2 slag was found to be wedge shaped, which decreased with increasing CaF2 to about 20 mol% followed by an increase through the rest of the CaF2 composition range. This was related to the effect of CaF2 on the structure of Al-O bonds for this slag.

关键词： rate constant slag structure molten steel isotope exchange technique adsorption coefficient nitrogen surface dissolution

HoLEP does not affect the overall sexual function of BPH patients： a prospective study

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Asian Journal of Andrology 2014年第6期16卷 873-877页

作者： Sung Hart Kim Hyung-Kook Yang hahn-Ey Lee Jae-seung Paick seung-June Oh Department of Urology Prostate Cancer Center National Cancer Center Goyang Korea Department of Epidemiology and Statistics and Cancer Policy Branch of National Cancer Control Research Institute National Cancer Center Goyang Korea Department of Urology Seoul National University Hospital Seoul Korea.

We aimed to prospectively evaluate the influence of holmium laser enucleation of the prostate （HoLEP） on the overall postoperative sexual function of benign prostatic hyperplasia （BPH） patients with lower urinary tract symptoms （LUTS） and to explore the relationship between sexual function and LUTS. From January 2010 to December 2011, sixty sexually active consecutive patients with BPH who underwent HoLEP were prospectively enrolled in the study. All patients filled out the Male Sexual Health Questionnaire （MSHQ） for evaluation of their overall sexual function and the International Prostatic Symptom Score （IPSS） for pre- and post-operative 6 months evaluation of their voiding symptoms. The LUTS and sexual function changes were statistically analyzed. The preoperative and 6 months postoperative status of the patients was compared using uroflowmetry and IPSS questionnaires. The analysis revealed significant improvements following HoLEP. Among the sub-domains of the MSHQ, postoperative sexual function, including erection, ejaculation, sexual satisfaction, anxiety or sexual desire, did not significantly change after HoLEP （P 〉 0.05）, whereas satisfaction scores decreased slightly due to retrograde ejaculation in 38 patients （63.3%）. Sexual satisfaction improved significantly and was correlated with the improvements of all LUTS and the quality-of-life （QoL） domains in IPSS after surgery （QoL; relative risk [RR]： -0.293; total symptoms, RR： -0.411; P 〈 0.05）. The nocturia score was associated with the erectile function score （odds ratio 0.318, P = 0.029）. The change in ejaculatory scores did not show significant association with IPSS scores. HoLEP did not influence overall sexual function, including erectile function. In addition, sexual satisfaction improved in proportion with the improvement of LUTS.

关键词： benign prostatic hyperplasia ejaculation erectile dysfunction lasers prostatectomy sex disorders

A miniaturized Tadpole Robot Using an Electromagnetic Oscillatory Actuator

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Journal of Bionic Engineering 2015年第1期12卷 29-36页

作者： Bu Hyun Shin Kyung-min Lee seung-Yop Lee Department of Mechanical Engineering Hanbat National University Daejeon 305-719 Korea Convergence Technology Examination Division Korean Intellectual Property Office Daejeon 302-701 Korea Department of Mechanical Engineering Sogang University Seoul 121-742 Korea

In this paper, we propose a miniaturized tadpole-like robot using an electromagnetic oscillatory actuator. The electro- magnetic actuator has a simple structure with a moving-magnet type and the body size is 13 mm （length） × 11 mm （height） ×10 mm （width）. A tail has the thickness of 100 μm and the length of 20 mm which is twice of the body-length （BL）. The tail attached to the oscillatory actuator generates undulatory propulsion for the forward swimming. Moreover, the tadpole robot enables the change of the direction by controlling input signal pattems applied to the oscillatory actuator. Prototypes of the tadpole robot have been manufactured and the thrust force and swimming speed are measured to evaluate the performance of the biomimetic robot in water at various tail-beat frequencies. The maximum thrust force is 42 mN at the tail-beat frequency of 30 Hz with voltage of 3 V, enabling the tadpole robot to swim at the speed of 210 mm·s^-1 （6 BL·s^-1）. The tadpole robot can also change its moving direction with the angular velocity of 21 deg·s^-1 at the half pulse pattem of 30 Hz.

关键词： fish robot biomimetics tadpole robot electromagnetic actuator

Properties of ZnO Thin Films Grown on Si (100) Substrates by Pulsed Laser Deposition

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Journal of Materials Science & Technology 2010年第11期26卷 973-976页

作者： Young Rae Jang Keon-Ho Yoo seung min Park Department of Physics Kyung Hee University Department of Chemistry Kyung Hee University

ZnO thin films were grown on Si （100） substrates by pulsed laser deposition using a ZnO *** substrate temperature was varied in the range of room temperature to 800 ℃,and the oxygen partial pressure of 0.1333 Pa （1 m Torr） to 1333 Pa （10 Torr）.The properties of the resulting films were investigated by photoluminescence （PL）,grazing incidence X-ray diffraction （GIXRD）,X-ray photoelectron spectroscopy （XPS）,and field emission scanning electron microscopy （FESEM）.Based on the ultraviolet （UV,～380 nm） to visible emission ratio in the PL spectrum,the optimum growth conditions were determined to be 600 ℃ and 133.3 Pa （1 Torr）,*** oxygen 1s peak in the XPS spectrum was decomposed into two *** peak at lower binding energy increased in intensity with the oxygen partial pressure from 0.1333 Pa （1 m Torr） to 133.3 Pa （1 Torr） while the other peak *** GIXRD curve at the optimum condition showed strong two peaks （002） and （103）.A strong correlation between the （103） peak intensity and the UV emission intensity was found.

关键词： ZnO Pulsed laser deposition Photoluminescence

Electrochemical characteristics of HVOF spray coated layer with WC-27NiCr and WC-10Co4Cr for Al bronze

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中国有色金属学会会刊：英文版 2012年第S3期22卷 753-759页

作者： min-su HAN seung-jun LEE min-sung KIM Seok-ki JANG Seong-jong KIM Division of Marine Engineering Mokpo Maritime University

Among the environmentally friendly marine energies,tidal current power plants require low cost because they do not need to construct a large *** power is particularly reliable energy source because the power generation capacity is predictable regardless of weather or *** materials or stainless steel have been used as materials of blades for current power ***,their strength and welding performance generated many problems in field *** alloys with excellent cavitation resistance and corrosion resistance were applied as blade materials to improve the durability of copper *** were coated with WC-27NiCr and WC-10Co4Cr using the high velocity oxy-fuel (HVOF) *** metal spray coating technology has the advantage in terms of the selection of materials for cost effectiveness and environmental effects of corrosion because the properties of the coat layer can be controlled *** with WC-27NiCr and WC-10Co4Cr by HVOF,WC-27NiCr shows better corrosion resistance *** reason for this seems to be that corrosion resistance improves and a stable passive film forms due to the effects of Ni and Cr.

关键词： tidal power copper alloys HVOF coating corrosion resistance

Ultrasensitive and Highly Stretchable Multiple‑Crosslinked Ionic Hydrogel Sensors with Long‑Term Stability

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Nano-Micro Letters 2023年第4期15卷 85-96页

作者： Jin‑Young Yu seung Eon Moon Jeong Hun Kim Seong min Kang Department of Mechanical Engineering Chungnam National UniversityDaejeon 34134Korea Emerging Nano‑Materials Research Section Electronics and Telecommunications Research InstituteDaejeon 305‑700Republic of Korea

Flexible hydrogels are receiving significant attention for their application in wearable ***,most hydrogel materials exhibit weak and one-time adhesion,low sensitivity,ice crystallization,water evaporation,and poor self-recovery,thereby limiting their application as *** issues are only partly addressed in previous ***,a multiplecrosslinked poly(2-(methacryloyloxy)ethyl)dimethyl-(3-sulfopropyl)ammonium hydroxide-co-acrylamide)(P(SBMA-co-AAm))multifunctional hydrogel is prepared via a one-pot synthesis method to overcome the aforementioned ***,ions,glycerol,and 2-(methacryloyloxy)ethyl)dimethyl-(3-sulfopropyl)ammonium hydroxide are incorporated to reduce the freezing point and improve the moisture retention *** proposed hydrogel is superior to existing hydrogels because it exhibits good stretchability(a strain of 2900%),self-healing properties,and transparency through effective energy dissipation in its dynamic crosslinked ***,2-(methacryloyloxy)ethyl)dimethyl-(3-sulfopropyl)ammonium hydroxide as a zwitterion monomer results in an excellent gauge factor of 43.4 at strains of 1300-1600%by improving the ion transportability and achieving a strong adhesion of 20.9 kPa owing to the dipole-dipole *** proposed hydrogel is promising for next-generation biomedical applications,such as soft robots,and health monitoring.

关键词： Hydrogel sensors Biocompatibility Multifunction High-sensitivity sensors Multiple-crosslink association

Effects of intravenous administration of polysaccharide purified from fermented barley on tumor metastasis inhibition via immunostimulating activities

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Food Bioscience 2022年第5期49卷 130-138页

作者： seung-U Son Han Wool Kim min seung Park Kwang-Soon Shin Department of Food Science and Biotechnology Kyonggi UniversitySuwon16227Republic of Korea Transdisciplinary Major in Learning Health System Department of Integrated Biomedical and Life ScienceGraduate SchoolKorea UniversitySeoul02841Republic of Korea

The present study was aimed that determine the effects of polysaccharide isolated from fermented barley about tumor metastasis inhibition via immune related factors such as complementary system,macrophages,natural killer(NK)cells,and cytotoxic T lymphocyte(CTL).To characterize the tumor inhibition effects through immunostimulation of polysaccharides purified from fermented barley,the active crude polysaccharide(BF-CP)was isolated from fermented barley and further fractionated into three purified polysaccharides(BF-I,-II,and-III)with different molecular weights through gel permeation ***-I was mainly composed of four monosaccharides,including xylose(32.90%),arabinose(26.71%),and glucose(33.43%).BF-I augmented the secretion of cytokines,such as interleukin(IL)-6,IL-12,and tumor necrosis factor-α,through peritoneal macrophages and potently activated the complement *** the experiment for NK cells and CTL activities,intravenous(i.v.)administration of BF-I significantly augmented the cytotoxicity of NK cells and CTL-mediated cytotoxicity against tumor *** addition,*** of BF-I potently inhibited tumor metastasis in a mouse model of lung cancer and tumor metastasis in mice with suppressed NK cell function through anti-asialo ***,BF-I shows potent tumor inhibition effects,and these effects are related to various immune factors such as macrophages,the complement system,NK cells,and ***,BF-I,the polysaccharide purified from fermented barley possess the new possibility for developing functional foods and medical ingredients.

关键词： Fermented barley Polysaccharide Immune system Anti-cancer

High scored thyroid storm after stomach cancer perforation: A case report

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World Journal of Clinical Cases 2022年第24期10卷 8768-8774页

作者： seung min Baik Yejune Pae Jae-Myeong Lee Department of Surgery Ewha Womans University Mokdong HospitalEwha Womans University College of MedicineSeoul 07985South Korea Department of Surgery College of MedicineGraduate School of Korea UniversitySeoul 02841South Korea Department of Acute Care Surgery Korea University Anam HospitalSeoul 02841South Korea

BACKGROUND Thyroid storm is a life-threatening ***,the prevalence of thyroid storm is 1%-2%among patients admitted to the hospital for *** and Wartofsky(1993)introduced a scoring system using precise clinical criteria to identify thyroid *** 17 cases of thyroid storm with a score>70 points have been *** thyroid storms are uncommon,their clinical findings resemble those of *** SUMMARY A 48-year-old man was referred to the emergency room from a local clinic owing to suspicion of gastric ulcer perforation;medications for hypertension,diabetes mellitus,and hyperthyroidism had been suspended 1 year prior to this *** performed an emergency distal gastrectomy with Billroth II anastomosis for gastric cardia cancer perforation,and the patient was referred to the surgical intensive care unit(ICU).On the 2nd d in the ICU,his body temperature(BT)increased to 41.3℃ at 19:00,with the thyroid storm score(90 points)peaking at 18:00(BT;41.2℃,pulse rate;138/min,irritable status).The patient was administered propylthiouracil,intravenous glucocorticoids,acetaminophen,and Lugol’s solution ***,we performed bladder irrigation with cold saline using a Foley catheter and applied a hypothermic blanket to decrease the patient's *** vital signs were stable on the 8th day in the *** Thyroid storms are uncommon,with few reports in the literature;however,their clinical findings resemble those of sepsis and require further *** an untreated thyroid storm results in a high mortality rate,it should be investigated when managing sepsis.

关键词： Thyroid storm Stomach cancer Severity score Sepsis Case report

Dynamic simulation of universal spacer in Dynesys dynamic stabilization system for human vertebra

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中国有色金属学会会刊：英文版 2009年第B9期19卷 238-242页

作者： Sung-min KIM In-Chul YANG seung-Yeol LEE Sung-Youn CHO Department of Medical Bio Engineering College of BiosystemDongguk University Research Institute of Biotechnology Dongguk University Department of Advanced Technology Fusion Graduate SchoolKonkuk University Research and Development Center U& I Corporation

The aim of this study is to analyze the simulated behavior of universal spacer in Dynesys dynamic stabilization system inserted in human vertebra. Dynesys, so-called "Dynamic neutralization system for the spine", dynamic stabilization system is a new concept in the surgical treatment of lower back pain recently. Universal spacer used as flexible material is to stabilize the spine and the material property of universal spacer is polycarbonate urethane. Universal spacer may apply different kinematic behaviors at implanted level in vertebra. Spinal range of motion(SROM) of inter-vertebra with installed Dynesys dynamic stabilization system was studied using Adams+LifeMOD as simulation software package. The vertebra model was set up to closely resemble the in-vivo conditions. Inter-vertebra rotations were measured by post processor of Adams and compared with the intact values. SROMs of the flexion, extension, lateral bending, and axial rotation of human virtual models were measured, where three spinal fixation systems such as rigid system, Dynesys system, and fused system were installed. As a result, the value of SROM is decreased in flexion-extension and lateral bending when the spinal fixation system is implanted. The movement of Dynesys system is similar to that of intact model by allowing the movement of lumbar. This means that the Dynesys system is proved to be safe and effective in the treatment of unstable spinal condition.

关键词：稳定系统动态模拟间隔人类脊椎聚碳酸酯聚氨酯运动行为旋转模型