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Stress Oriented Hydrogen Induced Cracking of Linepipe Steel

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Stress Oriented Hydrogen Induced Cracking of Linepipe Steel

Prominent cycling reversibility and kinetics enabled by CaTiO3 protective layer on Zn metal for aqueous Zn-ion batteries

第六届国际低合金高强度钢会议

作者： Wan Keun Kim gyu tae park Kyoo Young Kim Pohang University of Science and Technology Graduate Institute of Ferrous Technology San 31Hyoja-DongPohang 790-784Korea

The stress oriented hydrogen induced cracking(SOHIC) is a typical hydrogen embrittlement phenomenon occurring in the linepipe steels exposed to sour environment containing HS ***,even recently,the cracking mechanism of SOHIC has not been clarified because of lacking in the empirical data on the actual failure mode of SOHIC *** factors affecting SOHIC are discussed in terms of metallurgy of high strength linepipe steel and hydrogen *** cracking mechanisms of SOHIC are examined by comparing them with the empirical failure mode of SOHIC which is developed by observation of the actual fracture sites of the hydrogen induced blister cracking(HIBC) and secondary ***,the correlation between SOHIC and HIC is discussed.

关键词： linepipe steel stress oriented hydrogen induced cracking hydrogen induced cracking metallurgical factor diffusible hydrogen

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Journal of Energy Chemistry 2025年第1期100卷 245-258页

作者： Gaeun Lee Yong Nam Ahn Seongjoon So Chanwoo park Jong-Seong Bae taehyun park Il tae Kim Jaehyun Hur School of Chemical Biological and Battery Engineering Gachon University Seongnam Busan Center Korea Basic Science Institute

Aqueous Zn-ion batteries （AZIBs） have received considerable attention owing to their various advantages such as safety,low cost,simple battery assembly conditions,and high ionic ***,they still suffer from serious problems,including uncontrollable dendrite growth,corrosion,hydrogen evolution reaction （HER） from water decomposition,electrode passivation,and unexpected *** creation of a uniform artificial nanocrystal layer on the Zn anode surface is a promising strategy for resolving these ***,we propose the use of a perovskite CaTiO3（CTO） protective layer on Zn（CTO@Zn） as a promising approach for improving the performance of *** CTO artificial layer provides an efficient pathway for Zn ion diffusion towards the Zn metal because of the high dielectric constant （εr=180） and ferroelectric characteristics that enable the alignment of dipole moments and redistribute the Zn2+ions in the CTO *** avoiding the direct contact of the Zn anode with the electrolyte solution,the uneven dendrite growth,corrosion,parasitic side reactions,and HER are mitigated,while CTO retains its mechanical and chemical robustness during ***,CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared with bare ***@Zn shows steady overpotential （～68 m V） for 1500 h at 1 mA cm-2/0.5 mA h cm-2,excelling bare ***,when paired with the V2O5-C cathode,the CTO@Zn//V2O5-C full battery delivers 148.4 mA h g-1（based on the mass of the cathode） after 300 *** study provides new insights into Zn metal anodes and the development of high-performance AZIBs.

关键词： Artificial layer Dielectric constant Zn metal anode Zinc aqueous battery

Cavity-Suppressing Electrode Integrated with Multi-Quantum Well Emitter:A Universal Approach Toward High-Performance Blue TADF Top Emission OLED

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Nano-Micro Letters 2022年第4期14卷 75-89页

作者： Il gyu Jang Vignesh Murugadoss tae Hoon park Kyung Rock Son Ho Jin Lee WanQi Ren Min Ji Yu tae Geun Kim School of Electrical Engineering Korea UniversityAnam-ro 145Seongbuk-guSeoul 02841Republic of Korea

A novel device structure for thermally activated delayed fluorescence(TADF)top emission organic light-emitting diodes(TEOLEDs)that improves the viewing angle characteristics and reduces the efficiency roll-off is ***,we describe the design and fabrication of a cavity-suppressing electrode(CSE),Ag(12 nm)/WO_(3)(65 nm)/Ag(12 nm)that can be used as a transparent *** the TADF-TEOLED fabricated using the CSE exhibits higher external quantum efficiency(EQE)and improved angular dependency than the device fabricated using the microcavity-based Ag electrode,it suffers from low color purity and severe efficiency *** drawbacks can be reduced by using an optimized multi-quantum well emissive layer(MQW EML).The CSE-based TADF-TEOLED with an MQW EML fabricated herein exhibits a high EQE(18.05%),high color purity(full width at half maximum~59 nm),reduced efficiency roll-off(~46%at 1000 cd m^(−2)),and low angular *** improvements can be attributed to the synergistic effect of the CSE and MQW *** optimized transparent CSE improves charge injection and light outcoupling with low angular dependence,and the MQW EML effectively confines charges and excitons,thereby improving the color purity and EQE *** proposed approach facilitates the optimization of multiple output characteristics of TEOLEDs for future display applications.

关键词： Cavity suppression Multi-quantum well Viewing angle Efficiency roll-off Top emission OLED

Integrated guidance and control for damping augmented system via convex optimization

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Chinese Journal of Aeronautics 2022年第7期35卷 30-39页

作者： Bong-gyun park tae-Hun KIM The 1^(st)R&D Institute-4 Agency for Defense DevelopmentDaejeon 34186Republic of Korea

In this paper,an integrated guidance and control approach is presented to improve the performance of the missile *** approach includes damping augmented system with attitude rate feedback to decrease the oscillation during the homing phase for missiles with low *** addition,physical constraints,which can affect the performance of the missile interception,such as acceleration limit,seeker’s look angle,and look angle rate constraints are *** integrated guidance and control problem is formulated as a convex quadratic optimization problem with equality and inequality constraints,and the solution is obtained by a primal–dual interior point *** performance of the proposed method is verified through several numerical examples.

关键词： Convex optimization Damping augmented system Integrated guidance and control Physical constraint Primal-dual interior point method

Effects of design parameters and tension on behavior of a coil using finite element analysis

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Journal of Iron and Steel Research International 2018年第9期25卷 883-891页

作者： Kyu-tae parkI Hyun-chul park Department of Mechanical Engineering Pohang Universityof Science and Technology Pohang Gyeongbuk 790-784Korea

During the thin strip coiling process, it is necessary to use a sleeve with a mandrel to prevent excessive deformation of the strip. Stress distribution in the sleeve and in the strip is an important factor that determines the quality of the coil. However, owing to the accumulation of high pressure, it is difficult to determine the stress distribution through experimentation. Thus, stress analysis of the strip coiling process was conducted. Finite element analysis was used to investigate the effects of the weight of the strip and the mandrel on the stress distribution and stress concentration near the starting point of the coil. The radial stress was predicted for a coil with a stacked thickness of 384 mm, which corresponds to a strip length of 1486 m, using the stress analysis model developed in a preceding research. A method was presented to reduce the weight and radial stress of a strip coil. It was found that the deformation of the sleeve can be reduced by decreasing the gap between the mandrel segments. The thickness of the sleeve can be reduced from 120 to 106 mm using the stress analysis results. Furthermore, coiling tension can be reduced by 44% compared to the existing value considering the interlayer slip of the strip coil.

关键词： Strip coiling process Structural analysis Finite element method Mandrel Coiling tension

Recent advances in endoscopic retrograde cholangiopancreatography in Billroth II gastrectomy patients: A systematic review

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World Journal of Gastroenterology 2019年第24期25卷 3091-3107页

作者： tae Young park tae Jun Song Department of Internal Medicine Inje University Seoul Paik HospitalSeoul 04551South Korea Division of Gastroenterology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 138-736South Korea

BACKGROUND Endoscopic retrograde cholangiopancreatography(ERCP)in patients with Billroth Ⅱ gastrectomy has been considered a challenging procedure due to the surgically altered gastrointestinal ***,there has been a paucity of comparative studies regarding ERCP in Billroth Ⅱ gastrectomy cases because of procedure-related morbidity and mortality and practical and ethical *** systematic and comprehensive review was performed to obtain a recent perspective on ERCP in Billroth Ⅱ gastrectomy *** To systematically review the literature regarding ERCP in Billroth Ⅱ gastrectomy *** A systematic review was performed on the literature published between May 1975 and January *** following electronic databases were searched:PubMed,EMBASE,and Cochrane *** outcomes of successful afferent loop intubation and successful selective cannulation and occurrence of adverse events were *** A total of 43 studies involving 2669 patients were *** study designs were 36(83.7%)retrospective cohort studies,4(9.3%)retrospective comparative studies,2(4.7%)prospective comparative studies,and 1(2.3%)prospective cohort *** a total of 2669 patients,there were 1432 cases(55.6%)of sideviewing endoscopy,664(25.8%)cases of forward-viewing endoscopy,171(6.6%)cases of balloon-assisted enteroscopy,169(6.6%)cases of anterior obliqueviewing endoscopy,64(2.5%)cases of dual-lumen endoscopy,31(1.2%)cases of colonoscopy,and 14(0.5%)cases of multiple bending *** overall success rate of afferent loop intubation was 91.3%(2437/2669),and the overall success rate of selective cannulation was 87.9%(2346/2437).A total of 195 cases(7.3%)of adverse events *** success rates of afferent loop intubation and the selective cannulation rate for each type of endoscopy were as follows:side-viewing endoscopy 98.2%and 95.3%;forward-viewing endoscopy 97.4%and 95.2%;balloon-assisted enteroscopy 95.4%and 97.5%;oblique-viewing endosco

关键词： Endoscopic retrograde Cholangiopancreatography Therapeutic Endoscope Billroth Ⅱ operation Adverse event Systematic review

Amomum villosum induces longitudinal bone growth in adolescent female rats

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Journal of Traditional Chinese Medicine 2012年第3期32卷 453-458页

作者： Sun Haeng Lee Ji Young Kim Hocheol Kim Seul Ki park Cho Young Kim Sun Yong Chung gyu tae Chang Department of Pediatrics of Korean Medicine Kyung Hee University Hospital at Gang-dong892 Dongnam-roGangdong-guSeoul 134-727Republic of Korea Department of Herbal Pharmacology College of Korean MedicineKyung Hee University26 Kyungheedae-roDongdaemoon-guSeoul 130-701Republic of Korea Department of Neuropsychiatry of Korean Medicine Kyung Hee University Hospital at Gang-dong892 Dongnam-roGangdong-guSeoul 134727Republic of Korea

OBJECTIVE:This study was conducted to evaluate the effect of Amomum villosum on longitudinal bone ***:Adolescent female Sprague-Dawley rats were divided into 3 groups and treated for 4 days:control(distilled water,p.o.),recombinant human growth hormone(rhGH;100 μg/kg,s.c.),and ***(500 mg/kg,p.o.) *** day 3,tetracycline(20 g/kg,i.p.) was injected for growth plate *** days 2,3 and 4,5-bromo-2'-deoxyuridine(BrdU)(50 mg/kg,i.p.) was injected to label proliferating *** day 5,tibias were dissected and fixed in 4% paraformaldehyde,dehydrated,and sectioned for immunohistochemistry and ***:The rate of bone growth in the *** and rhGH groups increased to(410 ± 44) and(389 ± 46) μm/day(P<0.01),respectively,as compared with the control(330.7 ± 34.7) μm/*** thickness of the growth plates also increased to(591 ± 37) and(598 ± 32) μm,respectively,as compared with the control(524± 89) μm(P<0.001).The number of BrdU-positive cells in the chondrocytes of the *** and rhGH groups was also significantly higher(126±24) and(143±18) cells/mm 2,respectively) than in the control(109 ± 25) mm 2(P<0.05).Insulin-like growth factor-1 and bone morphogenetic protein-2 in the *** and rhGH groups were highly expressed in the growth plate as compared with the control samples,indicating increased bone ***:*** could be used to treat growth retardation during adolescence.

关键词： Amomum villosum Growth plate Bone Development Recombinant human growth hormone

Therapeutic effect of acupuncture point injection with placental extract in knee osteoarthritis

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Journal of Integrative Medicine 2017年第2期15卷 135-141页

作者： Kyeong Mee park tae Hwan Cho Inno Oriental Clinic Daejon 34014 South Korea Cho Orthopaedic Clinic Seoul 06643 South Korea

OBJECTIVE： This study evaluated the effectiveness of acupuncture point injection （API） with placenta extract on pain reduction and joint function in patients with knee osteoarthritis （OA）. METHODS： Fifty-two patients with knee OA, with an average age of 64, and having a symptom duration of more than 3 months were studied in this report. Placental extract was injected weekly into acupuncture point ST35, BL23, BL24 and BL25 for 5 weeks; 8 mL of placental extract into ST35 on the affected side, and 1 mL of placental extract to BL23, BL24 and BL25 bilaterally. RESULTS： After a five-week treatment of API with placental extract, pain was substantially decreased in patients of all Kellgren-Lawrence （KL） grades. Improvement of knee joint swelling was also apparent Decrease of pain and joint swelling improved daily working productive time among patients of all KL grades. CONCLUSION： Study results imply that API with placental extract is a potentially useful therapy to control pain and maintain joint functions in knee OA patients.

关键词： osteoarthritis, knee acupuncture point injection placental extracts pain swelling productive time

Guidance on the Choice of Threshold for Binary Forecast Modeling

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Advances in Atmospheric Sciences 2008年第1期25卷 83-88页

作者： Keon tae SOHN Sun Min park Department of Statistics Pusan National University

This paper proposes useful guidance on the choice of threshold for binary forecasts. In weather forecast systems, the probabilistic forecast cannot be used directly when estimated too smoothly. In this case, the binary forecast, whether a meteorological event will occur or not, is preferable to the probabilistic forecast. A threshold is needed to generate a binary forecast, and the guidance in this paper encompasses the use of skill scores for the choice of threshold according to the forecast pattern. The forecast pattern consists of distribution modes of estimated probabilities, occurrence rates of observations, and variation modes. This study is performed via Monte-Carlo simulation, with 48 forecast patterns considered. Estimated probabilities are generated by random variate sampling from five distributions separately. Varying the threshold from 0 to 1, binary forecasts are generated by threshold. For the assessment of binary forecast models, a 2×2 contingency table is used and four skill scores （Heidke skill score, hit rate, true skill statistic, and threat score） are compared for each forecast pattern. As a result, guidance on the choice of skill score to find the optimal threshold is proposed.

关键词： binary forecast Monte-Carlo simulation threshold skill score