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Recent research progress on magnesium alloys in Korea:A review

Journal of Magnesium and Alloys 2023年第10期11卷 3545-3584页

作者： Sung Hyuk park Ye jin Kim hyun Ji Kim Sang-Cheol jin Jong Un Lee Alexander Komissarov Kwang Seon Shin School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Laboratory of Hybrid Nanostructured Materials National University of Science and TechnologyMoscow 119049Russia Laboratory of Medical Bioresorption and Bioresistance Moscow State University of Medicine and DentistryMoscow 127473Russia Magnesium Technology Innovation Center School of Materials Science and EngineeringSeoul National UniversitySeoul 08826Republic of Korea

This review highlights the recent advancements in Mg research in South Korea with a prime focus on high-speed-extrudable Mg–Bi-based alloys for high productivity and strength,innovative techniques utilizing{10–12}twinning for improved mechanical properties,and alloying and processing methods for enhanced corrosion ***-alloyed Mg–Bi-based alloys possess thermally stableα-Mg matrix and secondary phase,which ensures high-speed extrusion of these alloys at elevated temperatures without hot ***,they exhibit outstanding extrudability with a maximum extrusion speed of up to 70 m/***,their high alloying contents offer excellent strength even after high-speed extrusion through strong solid solution hardening and particle hardening effects,making them suitable for high-performance extruded Mg *** pre-twinning process utilizing{10–12}twinning and the combined process of pre-twinning and subsequent annealing have shown promise in controlling microstructure and texture of wrought Mg alloys and thus enhancing their mechanical *** pre-twinning process enhances tensile strength,fatigue properties,and age-hardening rate of Mg ***,the combined processes of pre-twinning and subsequent annealing considerably improve their ductility,stretch formability,bending formability,and damping *** have been made to improve the corrosion resistance of Mg alloys through alloying additions,process treatments,and surface *** elements like Ca,Sc,and Sm alter the microstructural features(such as secondary phases and grain size)that affect the corrosion *** treatments such as multidirectional forging,screw rolling,and pulse electron beam can also improve the corrosion resistance by refining the ***,advanced surface coating technologies can create durable and corrosion-resistant layers for effectively protecting the Mg *** these research activities conducted

关键词： South Korea Mg–Bi alloys {10–12}twinning Corrosion Mechanical properties

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Ecological evaluation of marine macroalgal communities on five islands of Korea in the Yellow Sea

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Acta Oceanologica Sinica 2023年第6期42卷 49-56页

作者： Su jin Han Jae-Gil Jang hyun-Jung Kim Tae-Ho Seo Joo Myun park Marine Eco-Technology Institute Co. Ltd.Busan 48520R.O.Korea Coastal Production Institute Yeosu 59699R.O.Korea Dokdo Research Center Korea Institute of Ocean Science&TechnologyUljin 36315R.O.Korea

Macroalgae have long been used as biological indicators of marine ecosystem health worldwide due to their ecological importance and sensitivity to environmental stress.A number of previous studies have utilized macroalgal communities in monitoring surveys of environmental *** study examined the characteristics and patterns of marine macroalgal communities in the Yellow Sea off the western coast of *** were analyzed for the number of species,biomass,and coverage ratio by macroalgal *** the study period,82 macroalgal species(10 green algae,17 brown algae,and 55 red algae)were identified at the five study sites,with the highest number of species found at Gwanrido and Uido(both containing 41 species)and the lowest at Daeijakdo(27 species).The average biomass(via dry weight)was 98.63 g/m^(2),consisting of green algae(8.39 g/m^(2)),brown algae(35.08 g/m^(2)),and red algae(55.16 g/m^(2)).The dominant macroalgae species in terms of biomass were Corallina pilulifera,Sargassum thunbergii,and Ulva australis in the intertidal zones,and Botryocladia wrightii and Gelidium elegans in the subtidal ***,evenness,and diversity indices based on the biomass of abundant species were 5.08,0.65,and 2.30,respectively,over the entire study *** on the evaluation of the environmental states by the community indices,overall,the Ecological Evaluation Index of macroalgae communities in the study area was marked as“Good-Moderate”,but was determined as“ModerateLow”at several sites during *** results can be a direct approach in the assessment of coastal habitats in which anthropogenic as well as climate change influences persist.

关键词： macroalgae Yellow Sea ecological state groups ecological index Ecological Evaluation Index(EEI) community variable

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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

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Biomass growth characteristics of 13-year-old Pinus densiflora *** *** a post-fire plantation on different contour conditions in Samcheuk,Korea

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Journal of Mountain Science 2016年第7期13卷 1238-1244页

作者： Lee Ju-Hyoung Lee Do-hyung Kim Do-hyun park jin-Hwa KimJae-Hee Department of Forest Resources Yeungnam UniversityGyeongsan 712-749Republic of Korea Useful Plant Resources Center Korea National ArboretumYangpgeong-gun 12519Republic of Korea Korea Forest Welfare Institute Therapy-ro 209Bonghyeon-myeonYeongju-siGyeongsangbuk-doRepublic of Korea Department of forest genetic resources National Institute of Forest Science57HoegiroDongdaemun-guSeoul 02455Republic of Korea

We used preliminary data to estimate the growth volume of artificially reforested Pinus densiflora in a post-fire area on three different contour conditions. We compared the growth of P. densiflora on a south-facing slope(Ssth), north-facing slope(Snth) and ridge area(Ridge), using 7 trees selected from each stand aspect. The tree height, diameter and growth volume were measured and the dry weight of each plant part were compared and analyzed. The results revealed that the total dry weight was highest on Ssth(5992.3 g), followed by Snth(4833.2 g) and lowest on Ridge(3160.1 g). The height growth was highest on Snth(285.8 cm), followed by Ssth(274.5 cm) and lowest on Ridge(211.5 cm). The diameter growth was greatest on Ssth(7.37 cm), followed by Snth(7.10 cm) and lowest on Ridge(5.72 cm). The volume growth was highest on Ssth(4257.7 cm3), followed by Snth(3750.7 cm3) and lowest on Ridge(2093.7 cm3). Therefore, we should consider and include the concept of slope orientation together with differences in habitat environments in afforestation projects when creating artificial forests with P. densiflora. These study results can serve as important preliminary data for future establishment of artificial forest of P. densiflora in a post-fire plantation.

关键词： Pinus densiflora Growth characteristics Contour conditions Planted stand Post-fire plantation

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Influence of tool deflection on micro channel pattern of 6:4 brass with rectangular tool

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中国有色金属学会会刊：英文版 2009年第B09期19卷 164-170页

作者： Tae-jin JE Kang-Won LEE Sang-Cheon park Jae-Gu KIM Doo-Sun CHOI Kyoung-Taik park Kyung-hyun WHANG Nano Mechanical Systems Research Division Korea Institute of Machinery & Materials (KIMM)

Machining experiment of micro channel structure with 6:4 brass was carried out by shaping process using a single crystal diamond tool. FEM simulation using solid cantilever beam model was analyzed. In result of experiment, tool deflection is observed as machining characteristics through result of experiments such as surface roughness, cutting force and burr formations. And the influence of tool deflection is experimentally proved.

关键词：金刚石工具挠度通道模式黄铜矩形实验证明加工特性有限元模拟

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Effect of CaF2 content in refining slag on formation behavior of spinel inclusion in Ni-Cr-V-alloyed special steel

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Journal of Iron and Steel Research International 2018年第2期25卷 157-163页

作者： Jae-hong Shin Joo-hyun park Department of Materials Engineering Hanyang UniversityAnsan 426-791 Korea

The influence of CaF2 content on the formation behavior of spinel inclusions in the Ni-Cr-V-alloyed special steel was presented. The spinel was not formed at CaF2 content lower than 10 wt%. However, it was formed at early stage when the CaF2 content was greater than 30 wt%, followed by a modification to the aluminosilicate-type inclusions. Because the slag was saturated by MgO, the activity of MgO was unity irrespective of CaF2 content in the slag. Thus, Mg was transferred from slag to metal phase. Mg transferred to molten steel reacted with Al2O3-rich inclusions to form ***2O3 spinel. However, the spinel inclusion was modified to aluminosilicate-type inclusions by the reaction with Si and Ca transferred from slag to molten steel about 2-3 h later.

关键词： Spinel inclusion Refining slag CaF2 content Ni-Cr-V-alloyed special steel

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Hydrangeae Dulcis Folium Attenuates Physical Stress by Supressing ACTH-Induced Cortisol in Zebrafish

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Chinese Journal of Integrative Medicine 2020年第2期26卷 130-137页

作者： Junyoung Oh Dong hyun Kim Gi-young Kim Eun-jin park Jong Hoon Ryu Ji Wook Jung Se jin park Gwang-Woo Kim Seungheon Lee Department of Marine Life Science College of Ocean ScienceJeju National UniversityJeju(63243)Republic of Korea Departme nt of Medicinal Biotech no logy College of Health SciencesDong-A UniversityBusan(604-714)Republic of Korea Department of Food Bioengineering Jeju National UniversityJeju(63243)Republic of Korea Institute of Convergence BioHealth Dong-A UniversityBusan(604-714)Republic of Korea Department of Oriental Pharmaceutical Science College of PharmacyKyung Hee UniversityHoeki-dongDongdaemoon・KuSeoul(130-701)Republic of Korea Kyung Hee East-West Pharmaceutical Research Institute College of PharmacyKyung Hee UniversityHoeki-dongDongdaemoorvKuSeoul(130-701)Republic of Korea Department of Herbal Medicinal Pharmacology College of Herbal Bio-industryDaegu Haany UniversityYugok-dongGyeongsan(712-715)Republic of Korea School of Natural Resources and Environmental Sciences Kangwon National UniversityChuncheon(24341)Republic of Korea Marine Bio Con verge nee Center Gangneung Science&In dustry Promotion AgencyGangneung(25440)Republic of Korea

Objective:To determine the effects of Hydrangeae Dulcis Folium(EHDF)on physical stress,changes in the whole-body cortisol level and behaviour in zebrafish(Danio rerio).Methods:One hundred and seventy-four fish were randomly divided into 4[adrenocorticotropin hormone(ACTH)challenge test:4 fish per group]or 6 groups(behavioural test:10–12 fish per group,whole-body cortisol:4 fish per group).Net handling stress(NHS)was used to induce physical *** were treated with vehicle or EHDF(5–20 mg/L)for 6 min before they were exposed to *** then,fish were sacrificed for collecting body fluid from whole-body or conducted behavioural tests,including novel tank test and open field test,and were evaluated to observe anxiety-like behaviours and *** addition,to elucidate the mode of action of the anti-stress effects of EHDF,ACTH(0.2 IU/g,i.p.)challenge test was ***:The increased anxiety-like behaviours in novel tank test and open field test under stress were prevented by treatment with EHDF at 5–20 mg/L(P<0.05).Moreover,compared with the unstressed group,which was not treated with NHS,the whole-body cortisol level was significantly increased by treatment with NHS(P<0.05).Compared with the NHS-treated stressed control group,pre-treatment with EHDF at concentrations of 5–20 mg/L for 6 min significantly prevented the NHS-increased whole-body cortisol level(P<0.05).In addition,ACTH challenge test showed that EHDF completely blocked the effects of ACTH on cortisol secretion(P<0.05).Conclusion:EHDF may be a good antistress candidate and its mechanism of action may be related to its positive effects on cortisol release.

关键词： net handling stress zebrafish Hydrangeae Dulcis Folium whole-body cortisol behavioural tests

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Anderson-Fabry disease presenting with atrial fibrillation as earlier sign in a young patient:A case report

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World Journal of Clinical Cases 2021年第18期9卷 4823-4828页

作者： Hangyul Kim Min Gyu Kang hyun Woong park Jeong-Rang park jin-Yong Hwang Kyehwan Kim Department of Internal Medicine Gyeongsang National University HospitalJinju 52727South Korea Department of Internal Medicine Gyeongsang National University School of Medicine and Gyeongsang National University HospitalJinju 52727South Korea

BACKGROUND Anderson-Fabry disease(AFD)is an X-linked lysosomal storage disorder that results from a deficiency ofα-galactosidase A enzyme activity in which glycosphingolipids gradually accumulate in multi-organ *** manifestations are the leading cause of mortality in patients with *** them,arrhythmias comprise a large portion of the heart disease cases in AFD,most of which are characterized by conduction ***,atrial fibrillation as a presenting sign at the young age group diagnosed with AFD is *** SUMMARY We report a case of a 26-year-old man who was admitted with chest *** ventricular hypertrophy was fulfilled in the criteria by the Sokolow-Lyon index and atrial fibrillation on the 12 Leads-electrocardiography(ECG)that was documented in the emergency *** spontaneously restored to normal sinus rhythm,relationships between P and R waves,including a shorter PR interval on the ECG,were *** echocardiographic findings showed thickened interventricular septal and left posterior ventricular *** on the clues mentioned earlier,we realized the possibility of ***,we noticed the associated symptoms and signs,including bilateral mild hearing loss,neuropathic pain,anhidrosis,and angiokeratoma on the trunk and *** was finally diagnosed with classical AFD,which was confirmed by the gene mutation and abnormal enzyme activity ofα-galactosidase *** This case is a rare case of AFD as a presentation with atrial fibrillation at a young *** the relationship between P and Q waves on the ECG through sinus rhythm conversion may help in differential diagnosis of the cause of atrial fibrillation and hypertrophic myocardium.

关键词： Fabry disease Atrial fibrillation Electrocardiography Cardioversion Glycosphingolipids Case report

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Anti-obesity Effects of Ginsenosides in High-Fat Diet-Fed Rats

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Chinese Journal of Integrative Medicine 2019年第12期25卷 895-901页

作者： hyun-Jung park Ji hyun Kim Insop Shim Department of Physiology College of MedicineKyung Hee UniversitySeoul(130-701)Republic of Korea Department of Food Science&Biotechnology College of Science and EngineeringSuwon-si(16227)Republic of Korea

Objective: To examine the anti-obesity effects of ginsenosides in Korea Red Ginseng(KRG, Panax ginseng) in rats fed with a high-fat diet(HFD). Methods: Twenty-five 4-week-old obesity rats after receiving an HFD for 5 weeks;subsequently, they were additionally treated with ginsenosides Rb1, Rd, Rg1, or Re(10 mg/kg, intraperitoneal injection) for a further 3 weeks(n=5 in each group). The control rats were fed a normal diet. The food consumption, body weight, locomotor activity, serum lipids, adipose tissues, nitric oxide(NO) expression, leptin, neuropeptide Y(NPY), cholecystokinin(CCK) in the brains were measured. Results: In the HFD-fed rats, body weight, body fat mass, serum levels of leptin and NO were significantly higher than in the control rats(P<0.05 or P<0.01). However, the treatment of Rd, Re, and Rb1 markedly decreased body fat mass and body weight(P<0.05). The serum level of leptin and NO in ginsenoside-treated rats were markedly lower than the control group(P<0.01). The expression of NPY and CCK in the hypothalamic nuclei showed insignificant difference among groups. However, the expression of NPY immunoreactive neurons in the hypothalamus was significantly reduced in the Rb1-treated group(P<0.05). Conclusion: PD-type ginsenoside Rb1 from the crude saponins of KRG may be a useful compound for the treatment of obesity and related disorders through the modulation of peripheral and central appetite-regulating signals.

关键词： Panax ginseng ginsenosides hypothalamus obesity

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Polyherbal formula SC-E3 inhibits rheumatoid arthritis activity in a mouse model of type-Ⅱcollagen-induced arthritis

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Journal of Integrative Medicine 2021年第3期19卷 265-273页

作者： Ju-Yeon park Young-Won Kwon Sun-Ah Kim Sun-Dong park Chang-hyun Kim jin-Hee Kim Ju-Hee Lee College of Korean Medicine Dongguk UniversityGoyang 10326Republic of Korea Department of Medicine College of MedicineDongguk UniversityGoyang 10326Republic of Korea Department of Biomedical Laboratory Science College of Health ScienceCheongju UniversityCheongju 28503Republic of Korea

Objective:SC-E3 is a polyherbal formula that contains five medicinal herbs used frequently in traditional herbal *** our previous study,we demonstrated the antioxidant and anti-inflammatory effects of *** present study examined the effects of SC-E3 in a mouse model of type-II collagen-induced arthritis(CIA).Methods:In vivo,male DBA/1 J mice were immunized by intradermal injection of bovine type-II collagen and complete or incomplete Freund’s adjuvant,to induce ***-E3 was orally administered daily for 23 *** vitro,bone marrow-derived macrophages(BMMs)were treated with macrophage colony-stimulating factor(M-CSF)and receptor activator of nuclear factor-j B ligand(RANKL)in the absence or presence of ***:Administrations of SC-E3 were found to have anti-arthritic effects in the joints of CIA mice,as evidenced by reduced paw swelling,bone erosion and deformation,inflammatory cell infiltration,and inflammation in synovial ***-E3 also reduced serum levels of tumor necrosis factor-a,interleukin-1 b,aspartate aminotransferase and alanine ***,tartrateresistant acid phosphatase-positive osteoclast numbers in the joints were significantly lower in SC-E3-treated CIA mice than in CIA *** addition,the differentiations of BMMs to multinucleated osteoclasts induced by M-CSF and RANKL stimulation were dose-dependently reduced by ***:These results suggest that SC-E3 possesses substantial anti-arthritic activity because it inhibits pro-inflammatory cytokines and osteoclastogenesis,and that SC-E3 has potential therapeutic use for the treatment of rheumatoid arthritis.

关键词： Herbal formula Anti-inflammatory Rheumatoid arthritis Collagen-induced arthritis Osteoclastogenesis

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