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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

A Rapid Adaptation Approach for Dynamic Air‑Writing Recognition Using Wearable Wristbands with Self‑Supervised Contrastive Learning

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Nano-Micro Letters 2025年第2期17卷 417-431页

作者： Yunjian Guo Kunpeng Li Wei Yue Nam‑Young kim Yang Li Guozhen Shen jong‑Chul Lee Department of Electronic Convergence Engineering Kwangwoon UniversitySeoul 01897South Korea Radio Frequency Integrated Circuit(RFIC)Bio Centre Kwangwoon UniversitySeoul 01897South Korea Department of Electronic Engineering Kwangwoon UniversitySeoul 01897South Korea School of Microelectronics Shandong UniversityJinan 250101People’s Republic of China State Key Laboratory of Integrated Chips and Systems Fudan UniversityShanghai 200433People’s Republic of China School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijing 100081People’s Republic of China

Wearable wristband systems leverage deep learning to revolutionize hand gesture recognition in daily *** existing approaches that often focus on static gestures and require extensive labeled data,the proposed wearable wristband with selfsupervised contrastive learning excels at dynamic motion tracking and adapts rapidly across multiple *** features a four-channel sensing array composed of an ionic hydrogel with hierarchical microcone structures and ultrathin flexible electrodes,resulting in high-sensitivity capacitance *** wireless transmission from a Wi-Fi module,the proposed algorithm learns latent features from the unlabeled signals of random wrist ***,only few-shot labeled data are sufficient for fine-tuning the model,enabling rapid adaptation to various *** system achieves a high accuracy of 94.9%in different scenarios,including the prediction of eight-direction commands,and air-writing of all numbers and *** proposed method facilitates smooth transitions between multiple tasks without the need for modifying the structure or undergoing extensive task-specific *** utility has been further extended to enhance human–machine interaction over digital platforms,such as game controls,calculators,and three-language login systems,offering users a natural and intuitive way of communication.

关键词： Wearable wristband Self-supervised contrastive learning Dynamic gesture Air-writing Human-machine interaction

A Flexible Smart Healthcare Platform Conjugated with Artificial Epidermis Assembled by Three‑Dimensionally Conductive MOF Network for Gas and Pressure Sensing

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Nano-Micro Letters 2025年第2期17卷 601-620页

作者： Qingqing Zhou Qihang Ding Zixun Geng Chencheng Hu Long Yang Zitong Kan Biao Dong Miae Won Hongwei Song Lin Xu jong Seung kim State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012People’s Republic of China Department of Chemistry Korea UniversitySeoul 02841Republic of Korea TheranoChem Incorporation Seoul 02856Republic of Korea

The rising flexible and intelligent electronics greatly facilitate the noninvasive and timely tracking of physiological information in telemedicine *** building bionic-sensitive moieties is vital for designing efficient electronic skin with advanced cognitive functionalities to pluralistically capture external ***,realistic mimesis,both in the skin’s three-dimensional interlocked hierarchical structures and synchronous encoding multistimuli information capacities,remains a challenging yet vital need for simplifying the design of flexible logic ***,we construct an artificial epidermal device by in situ growing Cu_(3)(HHTP)_(2) particles onto the hollow spherical Ti_(3)C_(2)T_(x) surface,aiming to concurrently emulate the spinous and granular layers of the skin’s *** bionic Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2) exhibits independent NO_(2) and pressure response,as well as novel functionalities such as acoustic signature perception and Morse code-encrypted message ***,a wearable alarming system with a mobile application terminal is self-developed by integrating the bimodular senor into flexible printed *** system can assess risk factors related with asthmatic,such as stimulation of external NO_(2) gas,abnormal expiratory behavior and exertion degrees of fingers,achieving a recognition accuracy of 97.6%as assisted by a machine learning *** work provides a feasible routine to develop intelligent multifunctional healthcare equipment for burgeoning transformative telemedicine diagnosis.

关键词： Ti_(3)C_(2)T_(x)@Cu_(3)(HHTP)_(2)composites NO_(2)/pressure flexible sensors Health-monitoring Machine learning

Selectively patterned TiO2 nanorods as electron transport pathway for high performance perovskite solar cells

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Nano Research 2019年第3期12卷 601-606页

作者： Daihong Huh KyoungSuk Oh Minjin kim Hak-jong Choi Dong Suk kim heon Lee Department of Materials Science and Engineering Korea University Anam-ro 145 Sungbuk-Gu Seoul 136-701 Republic cf Korea KIER-UNIST Advanced Center for Energy Korea Institute of Energy Research (KIER) UNIST-Gil 50 Eonyang-eup Ulju-gun Ulsan 689-851 Republic of Korea Department of Electrical and Systems Engineering University of Pennsylvania Philadelphia Pennsylvania 19104 USA

Organic-inorganic hybrid perovskite solar cells (PSCs) are attracting tremendous attention for new-generation photovoltaic devices because of their excellent power conversion efficiency and simple fabrication process. One of the various approaches to increase the efficiency of PSCs is to change the material or structure of the carrier transport layer. Here, optically long and electrically short structural concept is proposed to enhance the characteristics of a PSC by employing selectively grown single crystalline TiO2 nanorods. The approach has the merit of increasing the electro n-hole separati on effectively and en ables a thicker active layer to be coated without electrical loss by using TiO2 nano rods as an electr on pathway. Moreover, selectively grow n TiO2 nano rods in crease the optical path of the in cide nt light via scatteri ng effects and en able a smooth coati ng of the active layer. Nano imprint lithography and hydrothermal growth were employed to fabricate selectively grow n TiO2 nanorod substrates. The fabricated solar cell exhibits an efficiency of 19.86% with a current density, open-circuit voltage, and fill factor of 23.13 mA/cm^2, 1.120 V, and 76.69%, respectively. Time-resolved photoluminescence, ultraviolet-visible (UV-Vis) spectroscopy, and the incident phot on to current efficiency (IPCE) an alysis were conducted to understand the factors resp on sible for the improvement in characteristics of the fabricated PSCs.

关键词： perovskite solar cells patter ned T1O2 nanorods nanoimprint lithography

nfluence of paradoxical sleep deprivation and sleep recovery on testosterone level in rats of different ages

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Asian Journal of Andrology 2012年第2期14卷 330-334页

作者： Mi Mi Oh Jin Wook kim Myeong heon Jin Je jong kim Du Geon Moon Department of Urology Korea University Medical Center Seou1435-766 Korea Department of Urology Korea University Medical Center and Korea University Institute of Regenerative Medicine Seou1435-766 Korea

This study was performed to assess serum testosterone alterations induced by paradoxical sleep deprivation （PSD） and to verify their attenuation during sleep recovery （SR） based on different durations and ages. Wistar male rats aged 12 weeks for the younger group and 20 weeks for the elder group were randomly distributed into one of the following groups： a control group （cage and platform）, 3-day SD, 5-day SD, 7-day SD, 1-day SR, 3-day SR and 5-day SR groups. For PSD, the modified multiple platform method was used to specifically limit rapid eye movement （REM） sleep. Differences in the testosterone and luteinizing hormone levels between the younger group and the elder group according to duration of PSD and SR recovery were analysed. Testosterone continued to fall during the sleep deprivation period in a time-dependent manner in both the younger （P=-0.001, correlation coefficient r=-0.651） and elder groups （P=0.001, correlation coefficient r=-0.840）. The elder group showed a significantly lower level of testosterone compared with the younger group after PSD. Upon SR after 3 days of PSD, the testosterone level continued to rise for 5 days after sleep recovery in the younger group （P=0.013）, whereas testosterone concentrations failed to recover until day 5 in the elder group. PSD caused a more detrimental effect on serum testosterone in the elder group compared to the younger group with respect to decreases in luteinizing hormone （LH） levels. The replenishment of serum testosterone level was prohibited in the elder group suggesting that the effects of SD/SR may be age-dependent. The mechanism by which SD affects serum testosterone and how age may modify the process are still unclear.

关键词： luteinizing hormone paradoxical sleep deprivation recovery testosterone

Expression rates of p16,p53 in head and neck cutaneous squamous cell carcinoma based on human-papillomavirus positivity

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World Journal of Clinical Cases 2025年第9期13卷 13-23页

作者： Ha-jong Nam heongrae Ryu Da-Woon Lee Je Yeon Byeon Jun Hyuk kim Ji Hye Lee Soomin Lim Hwan Jun Choi Department of Plastic and Reconstructive Surgery Soonchunhyang University Gumi HospitalGumi-si 39371South Korea Department of Plastic and Reconstructive Surgery College of MedicineSoonchunhyang UniversityCheonan-si 31151South Korea Department of Pathology Soonchunhyang University HospitalCheonan-si 31151South Korea Bachelor of Medicine and Bachelor of Surgery University College LondonMedical SchoolLondon WC1E 6DEUnited Kingdom

BACKGROUND The high prevalence of human papillomavirus(HPV)infection in oropharyngeal squamous cell carcinoma(SCC)is well established,and p16 expression is a strong ***-related tumors exhibit unique mechanisms that target p16 and p53 ***,research on HPV prevalence and the combined predictive value of p16 and p53 expression in head and neck cutaneous SCC(HNCSCC),particularly in Asian populations,remains *** retrospective study surveyed 62 patients with HNSCC(2011-2020),excluding those with facial warts or other skin *** To explore the prevalence of HPV and the predictive value of p16 and p53 expression in HNCSCC in Asian *** All patients underwent wide excision and *** staining for HPV,p16,and p53 yielded positive and negative *** relevance of each marker was investigated by categorizing the tumor locations into high-risk and middle-risk zones based on recurrence *** Of the 62 patients,20(32.26%)were male,with an average age of 82.27 years(range 26-103 years).High-risk included 19 cases(30.65%),with the eyelid and lip being the most common sites(five cases,8.06%).Middle-risk included 43 cases(69.35%),with the cheek being the most common(29 cases,46.77%).The p16 expression was detected in 24 patients(38.71%),p53 expression in 42 patients(72.58%),and HPV in five patients(8.06%).No significant association was found between p16 expression and the presence of HPV(P>0.99),with a positive predictive value of 8.33%.CONCLUSION This study revealed that p16,a surrogate HPV marker in oropharyngeal SCC,is not reliable in HNCSCC,providing valuable insights for further research in Asian populations.

关键词： Squamous cell carcinoma Oropharyngeal Non-oropharyngeal Human papillomavirus The p16 The p53

UV light driven high-performance room temperature surface acoustic wave NH_(3) gas sensor using sulfur-doped g-C_(3)N_(4) quantum dots

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Nano Research 2023年第5期16卷 7682-7695页

作者： Kedhareswara Sairam Pasupuleti Sourabh S.Chougule Devthade Vidyasagar Na-hyun Bak Namgee Jung Young-heon kim jong-Hee Lee Song-Gang kim Moon-Deock kim Department of Physics Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea Graduate School of Energy Science and Technology(GEST) Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea Department of Materials Science and Engineering Kyungpook National University80 Daehak-roBuk-guDaegu 41566Republic of Korea Graduate School of Analytical Science and Technology Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea Department of Digital Agricultural Promotion Agricultural Cooperative UniversityGoyang-siGyeonggi-do 10292Republic of Korea Department of Smart Information Technology Joonbu University305 Donghen-roGoyangKyunggi-do 10279Republic of Korea Institute of Quantum Systems(IQS) Chungnam National University99 Daehak-roYuseong-guDaejeon 34134Republic of Korea

Nanomaterials integrated surface acoustic wave(SAW)gas sensing technology has emerged as a promising candidate for realtime toxic gas sensing applications for environmental and human health ***,the development of novel chemical interface based on two-dimensional(2D)sensing materials for SAW sensors for the rapid and sensitive detection of NH_(3)gas at room temperature(RT)still remains ***,we report a highly selective RT NH_(3)gas sensor based on sulfur-doped graphitic carbon nitride quantum dots(S@g-C_(3)N_(4)QD)coated langasite(LGS)SAW sensor with enhanced sensitivity and recovery rate under ultraviolet(UV)***,the sensitivity of the S@g-C_(3)N_(4)QD/LGS SAW sensor to NH_(3)(500 ppb)at RT is dramatically enhanced by~4.5-fold with a low detection limit(~85 ppb),high selectivity,excellent reproducibility,fast response/recovery time(70 s/79 s)under UV activation(365 nm)as compared to dark ***,the proposed sensor exhibited augmented NH_(3)detection capability across the broad range of relative humidity(20%–80%).Such remarkable gas sensing performances of the as-prepared sensor to NH_(3)are attributed to the high surface area,enhanced functional groups,sulfur defects,UV photogenerated charge carriers,facile charge transfer in the S@g-C_(3)N_(4)QD sensing layer,which further helps to improve the gas molecules adsorption that causes the increase in conductivity,resulting in larger frequency *** gas sensing mechanism of S@g-C_(3)N_(4)QD/LGS SAW sensor is ascribed to the enhanced electroacoustic effect,which is supported by the correlation of resistive type and COMSOL Multiphysics simulation *** envisage that the present work paves a promising strategy to develop the next generation 2D g-C_(3)N_(4)based high responsive RT SAW gas sensors.

关键词： two-dimensional graphitic carbon nitride(2D g-C_(3)N_(4)) sulfur doping quantum dots surface acoustic wave(SAW)sensor NH_(3)gas electroacoustic effect

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

Pediatric appendicitis with appendicolith often presents with prolonged abdominal pain and a high risk of perforation

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World Journal of Pediatrics 2018年第2期14卷 184-190页

作者： Hee Mang Yoon Jung heon kim jong Seung Lee Jeong-Min Ryu Dae Yeon kim Jeong-Yong Lee Department of Radiology and Research Institute of Radiology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Emergency Medicine Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Pediatric Surgery Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Pediatrics Asan Medical CenterUniversity of Ulsan College of Medicine88Olympic-ro 43-gilSongpa-guSeoul 05505South Korea

Background Appendicolith can cause appendiceal obstruction and acute *** high prevalence may be related to the high perforation rate in pediatric *** study assessed the characteristics of appendicolith and its clinical significance in pediatric *** A retrospective study was performed among children and adolescents younger than 17 years who were preopera-tively diagnosed with appendicitis in the pediatric emergency department(ED).A total of 269 patients with a mean age of 9.98±3.37 years were *** features and contrast-enhanced computed tomography findings were *** Among the 269 patients,147(54.6%)had appendicoliths,with a mean maximal diameter of 5.21±2.34 ***-pared to the no appendicolith group,the appendicolith group demonstrated more prolonged abdominal pain(≥48 hours)before the ED visit(23.1%vs.11.5%;P=0.013),clinical features of severe appendicitis(presence of fever,vomiting,posi-tive urine ketone,and increased C-reactive protein),and higher rate of perforation(43.5%vs.9.8%;P<0.001).Multivariate risk factor analysis for perforated appendicitis in the appendicolith group revealed that maximal diameter of 5 mm or more in the appendicolith(adjusted odds ratio[aOR]2.919;95%CI 1.325-6.428,P=0.008)and proximal collapse adjacent to the appendicolith(aOR 2.943;95%CI 1.344-6.443,P=0.007)were *** Pediatric appendicitis with appendicolith often presents with prolonged abdominal pain and severe clinical conditions with a high risk of perforation.

关键词： Appendicitis Appendicolith Computed tomography Pediatrics Risk factors