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Bird-mimetic Wing System of Flapping-wing Micro Air Vehicle with Autonomous Flight Control Capability

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Journal of Bionic Engineering 2016年第3期13卷 458-467页

作者： Sriyulianti Widhiarini Ji Hwan Park Bum Soo Yoon Kwang Joon Yoon ll-Hyun Paik Jong heon Kim Chan Yik Park seung Moon Jun Changho Nam Department of Aerospace Engineering Konkuk University Gwangjin-gu Seoul South Korea Deptartment of PGM Technology Hanwha Corp. R&D Center Daejeon South Korea Agency for Defense Development Daejeon South Korea Department of Engineering Technology Arizona State University Mesa Arizona

A micro air vehicle with a bird-mimetic up-down and twisting wing drive system was developed in this study. The Flap- ping-wing Micro Air Vehicle （FMAV）, with a 50 cm wingspan and a double-crank drive system, performed successful flights of up to 23 min. The performance and capabilities of the FMAV were enhanced by adapting a number of unique features, such as a bird-mimetic wing shape with a span-wise camber and an up-down and twisting wing drive mechanism with double-crank linkages, This lift-enhancing design by mimicking the flapping mechanism of a bird＇s wing enabled the 210 g FMAV to fly autonomously in an outdoor field under wind speeds of less than 5 m.s-1. Autonomous flight was enabled by installing a flight control computer with a micro-electro-mechanical gyroscope and accelerometers, along with a micro video camera and an ultralight wireless communication system inside the fuselage. A comprehensive wind tunnel test shows that the FMAV with a high-camber wing and double-crank mechanism generates more lift and less net thrust than the FMAV with a flat wing and single-crank mechanism, which confirms the improved performance of the developed FMAV, as well as the superior slow flying or hovering capabilities of the FMAV with a high-camber wing and double-crank wing drive system.

关键词： flapping-wing MAV autonomous flight biomimetic wing double crank wing

Organic functional dyes

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Green Chemical Engineering 2023年第4期4卷 377-378页

作者： Zhi-Qian Guo Wei-hong Zhu Jiangli Fan Jong seung Kim Key Laboratory for Advanced Materials and Institute of Fine Chemicals School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237China State Key Laboratory of Fine Chemicals Frontiers Science Center for Smart Materials Oriented Chemical EngineeringDalian University of TechnologyDalian116024China Research Institute of Dalian University of Technology in Shenzhen Shenzhen518057China Department of Chemistry Korea UniversitySeoul02841South Korea

Functional dyes go beyond traditional color applications and offer distinctive properties and functionalities,making them suitable for a wide range of industrial applications such as healthcare,agriculture,textiles,and *** dyes can serve as fluorescent probes in medical research,photosensitizers in cancer therapy,pesticide markers in agriculture,antimicrobial agents on textiles,and charge transport materials in *** ongoing research into new functional dyes reflects the interest of industries in identifying novel applications for these materials.

关键词： materials. functional dyes

Impacts of statin and metformin on neuropathy in patients with type 2 diabetes mellitus: Korean Health Insurance data

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World Journal of Clinical Cases 2021年第33期9卷 10198-10207页

作者： hong Ki Min Se Hee Kim Jong Han Choi Kyomin Choi Hae-Rim Kim Sang-heon Lee Department of Internal Medicine Konkuk University Medical CenterSeoul KS013South Korea Department of Neurology Konkuk University Medical CenterSeoul KS013South Korea Division of Rheumatology Department of Internal MedicineKonkuk University School of MedicineSeoul KS013South Korea

BACKGROUND Neuropathy is a common chronic complication in type 2 diabetes mellitus(T2DM).Statin and metformin are commonly used medications in T2DM patients,and some studies showed statin-or metformin-induced *** To evaluate the incidence of neuropathy among patients with T2DM associated with statin and metformin *** Korean Health Insurance Review and Assessment national patient sample data from 2016 and 2017 were *** with T2DM and no complications were divided into statin/metformin/statin+metformin users and *** incidence was defined by International Statistical Classification of Diseases and Related Health Problems,10th revision codes and concomitant prescriptions for anticonvulsants or *** regression analyses were conducted to examine the associations between statin/metformin/statin+metformin therapies and the incidence of *** score(PS)matching was performed on the basis of age,sex and *** Overall,34964 and 35887 patients with T2DM and no complications were included in the Korean Health Insurance Review and Assessment national patient sample datasets from 2016 and 2017,*** therapy was associated with increased risks of neuropathy in 2016 and 2017[PS-matched odds ratio(OR)=1.22,95%confidence interval(CI):1.08-1.38;PS-matched OR=1.17,95%CI:1.03-1.33,respectively].Metformin therapy was associated with reduced risks of neuropathy in 2016 and 2017(PS-matched OR=0.30,95%CI:0.21-0.42;PSmatched OR=0.44,95%CI:0.32-0.60,respectively).Combined statin+metformin therapy was not significantly associated with neuropathy in 2016 or 2017(PSmatched OR=0.85,95%CI:0.61-1.19;PS-matched OR=0.95,95%CI:0.66-1.38,respectively).CONCLUSION Statin therapy was associated with enhanced risk of new-onset neuropathy in patients with T2DM,but metformin therapy showed the opposite association.

关键词： Diabetes mellitus Neuropathies Hydroxymethylglutaryl-CoA reductase inhibitors Metformin

Relationship between compressive and tensile strengths of roller-compacted concrete

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Journal of Traffic and Transportation Engineering(English Edition) 2018年第3期5卷 215-223页

作者： Chamroeun Chhorn Seong Jae hong seung Woo Lee Department of Civil Engineering Gangneung-Wonju National University Gangneung-si Gangwon-do 210-702 Republic of Korea

The abstract roller-compacted concrete （RCC） is a zero slump concrete comprising the same materials as that of conventional concrete with different proportions. The RCC must be compacted to reach its final form. The effects of hydration and aggregate interlock on its strength are considerable. For similar binder contents, the compressive strength of the RCC is generally higher than that of the conventional concrete; however, the tensile strength of RCC may not be superior to that of the conventional concrete. Adequate tensile strength is necessary to resist fatigue cracking, particularly in pavement applications. However, the compressive strength is frequently used in assessing the quality control and quality assurance of pavements. Therefore, the relationship between the compressive and tensile strengths of the RCC should be analyzed. Unfortunately, only a few studies have been conducted on this relationship. The objective of this study is to identify the difference between the indirect tensile strengths of the RCC and those of the conventional concrete as well as develop relationship equations to evaluate the compressive and tensile strengths. In this study, regression equations are developed to estimate the indirect tensile strengths, which are known as flexural and splitting tensile strengths, using the compressive strength of the RCC. The results show that the flexural strength of the RCC is within the predicted values obtained from the conventional concrete equations for a given compressive strength. In contrast, the splitting tensile strength of the RCC is relatively lower than that of the conventional concrete for the given compressive strength.

关键词： Roller-compacted concrete Conventional concrete Compressive strength Flexural strength Splitting tensile strength

Inhibitory effects of rapamycin on the different stages of hepatic fibrosis

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World Journal of Gastroenterology 2014年第23期20卷 7452-7460页

作者： Yun Jeung Kim Eaum Seok Lee Seok Hyun Kim heon Young Lee seung Moo Noh Dae Young Kang Byung Seok Lee Department of Internal Medicine Chungnam National University School of MedicineDaejeon 301-721South Korea Department of Surgery Chungnam National University School of MedicineDaejeon 301-721South Korea Department of Pathology Chungnam National University School of MedicineDaejeon 301-721South Korea

AIM: To investigate and compare the inhibitory effects of rapamycin in the different stages of liver fibrosis.

关键词： Liver cirrhosis Sirolimus Transforming growth factor beta Platelet-derived growth factor Ribosomal protein S6 kinases

Complications after ileal pouch-anal anastomosis in Korean patients with ulcerative colitis

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World Journal of Gastroenterology 2014年第23期20卷 7488-7496页

作者： seung-Bum Ryoo Heung-Kwon Oh Eon Chul Han heon-Kyun Ha Sang Hui Moon Eun Kyung Choe Kyu Joo Park Division of Colorectal Surgery Department of SurgerySeoul National University College of MedicineSeoul 110-744South Korea Healthcare Research Institute Seoul National University Hospital Healthcare System Gangnam CenterSeoul 135-984South Korea

AIM: To investigate the outcomes of treatments for complications after ileal pouch-anal anastomosis (IPAA) in Korean patients with ulcerative colitis.

关键词： Ulcerative colitis Ileal pouch-anal anastomosis Complications Pouch failure Pouch function

Fifteen-year-old colon cancer patient with a 10-year history of ulcerative colitis

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World Journal of Gastroenterology 2013年第15期19卷 2437-2440页

作者： seung Yeon Noh seung Young Oh Soo-hong Kim Hyun-Young Kim Sung-Eun Jung Kwi-Won Park Department of Surgery Seoul National University HospitalSeoul 110-744South Korea Department of Pediatric Surgery Seoul National University Children's HospitalSeoul 110-744South Korea

Inflammatory bowel disease (IBD) is regarded as one of the risk factors for colorectal cancer, and early detection of cancer in these patients may be difficult, especially in pediatric patients. Prognosis of pediatric colorectal cancer is known to be poor, because of delayed diagnosis and unfavorable differentiation. We report a case of a pediatric patient with a 10-year history of ulcerative colitis who was diagnosed with sigmoid colon cancer when he was 15 years old. He underwent proctocolectomy with ileal pouch anal anastomosis. Postoperative pathological examination of the tumor revealed adenocarcinoma. The pericolic tissue layer was infiltrated, but metastases were not found in either of the two lymph nodes. Children with a long history of predisposing factors such as IBD need particular attention to the possibility of colorectal cancer. Early diagnosis through regular screening with colonoscopy is one of the most important critical factors for a good prognosis.

关键词： Colon Rectum Cancer Ulcerative colitis Pediatric

Formation of unidirectional nanoporous structures in thickly anodized aluminum oxide layer

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中国有色金属学会会刊：英文版 2009年第4期19卷 1013-1017页

作者： Hyun-Chae NA Taek-Jin SUNG Seok-heon YOON seung-Kyoun HYUN Mok-Soon KIM Young-Gi LEE Sang-Hyun SHIN Seok-Moon CHOI Sung YI Division of Materials Science and Engineering Inha University Samsung Electro-Mechanics Co. Ltd.

A series of anodic aluminum oxide(AAO) was grown on the commercially pure 1050 aluminum sheet by controlling electrolyte temperature(2-15 ℃) and anodizing time(0.5-6 h),using a fixed applied current density of 3 A/dm2 in diluted sulfuric acid electrolyte.A crack-free thick AAO with the thickness of 105-120 μm and containing unidirectional nano sized pores(average pore diameter of 5-7 nm) is successfully achieved in the specimens anodized for 2 h,irrespective of electrolyte *** anodizing time reaches 6 h,very thick AAO with the thickness of 230-284 μm is grown,and average diameter of unidirectional pores is in the range of 6-24 *** higher values in both the AAO thickness and pore diameter are attained for the specimens anodized at higher temperatures of 10-15 ℃.A crack is observed to exist in the AAO after anodizing up to 4 h and more.A higher fraction(more than 9%) of the crack is shown in the specimens anodized at higher temperatures of 10-15 ℃ for 6 h and a considerable amount of giant cracks are contained.

关键词：阳极氧化铝纳米孔单向结构层电解液温度平均直径氧化时间硫酸电解液

Specific oceanographic characteristics and phytoplankton responses influencing the primary production around the Ulleung Basin area in spring

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Acta Oceanologica Sinica 2020年第2期39卷 107-122页

作者： Minji Lee Jin Ho Kim Yun-Bae Kim Chan hong Park Kyoungsoon Shin seung Ho Baek South Sea Research Institute Korea Institute of Ocean Science and TechnologyGeoje 53201Korea Ulleungdo/Dokdo Ocean Science Station Korea Institute of Ocean Science and TechnologyUlleungdo 40205Korea Dokdo Research Center East Sea Research InstituteKorea Institute of Ocean Science and TechnologyUljin 36315Korea

The East Sea(Sea of Japan)is a marginal,semi-closed sea in the northwestern *** Ulleung Basin area,which is located near the subpolar front of the East Sea,is known to have high primary production and good fisheries in spring *** episodic wind-driven events during the spring of 2017,horizontal and vertical profiles of physical chemical biological factors were investigated at 29 stations located in the Ulleung Basin *** addition,growth responses of phytoplankton communities to nutrient additions were evaluated by bioassay experiments to understand the fluctuation of phytoplankton *** of strong northwestern wind,phytoplankton biomass was scattered and upwelling phenomenon might be suppressed in this *** phytoplankton abundances in the coastal stations were significantly higher than offshore and island *** contrast,the nutrient and chlorophyll a(Chl a)concentrations and the phytoplankton biomass were quite low in all *** was dominated group(>75.1%for coastal,40.0%for offshore and 43.6%for island stations).In the algal bioassays,the phytoplankton production was stimulated by N *** in vivo Chl a values in the+N and+NP treatments were significantly higher than the values in the control and the+P *** on the field survey,the higher nutrients in coastal waters affected the growth of diatom assemblages,however,little prosperity of phytoplankton was observed in the offshore waters despite the injection of sufficient nutrients in bioassay *** growth of phytoplankton depended on the initial cell *** of results indicated that a dominant northwestern wind led to a limited nutrients condition at euphotic layers,and the low level of biomass supply from the coasts resulted in low primary *** supplying nutrients and introducing phytoplankton through the currents are critical to maintain the high productivity in the Ulleung Basin area of the East Sea.

关键词： Ulleung Basin Ulleungdo and Dokdo spring phytoplankton blooms episodic windstorm algal bioassays primary production