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Functional photonic structures for external interaction with flexible/ wearable devices

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Nano Research 2021年第9期14卷 2904-2918页

作者： Young Jin yoo Se-Yeon Heo Yeong Jae Kim Joo hwan Ko Zafrin Ferdous Mira Young Min Song School of Electrical Engineering and Computer Science Gwangju Institute of Science and Technology(GIST)123 Cheomdangwagi-roBukguGwangju 61005Republic of Korea Korea Institute of Ceramic Engineering&Technology Ceramics Test-Bed Center3321 Gyeongchung-daeroSindun-myeonIcheon-si Gyeonggi-do 17303Republic of Korea Anti-Viral Research Center Gwangju Institute of Science and Technology(GIST)123 Cheomdangwagi-roBukguGwangju 61005Republic of Korea AI Graduate School Gwangju Institute of Science and Technology(GIST)123 Cheomdangwagi-roBukguGwangju 61005Republic of Korea

In addition to vital functions,more subsidiary functions are being expected from wearable *** wearable technology thus far has achieved the ability to maintain homeostasis by continuously monitoring physiological *** quality of life improves if,through further developments of wearable devices to detect,announce,and even control unperceptive or noxious signals from the *** materials based on photonic engineering can fulfil the abovementioned *** to the flexibility and zero-power operation of such materials,they can be applied to conventional wearables without affecting existing *** achievements to freely tailoring a broad range of electromagnetic waves have encouraged the development of wearable systems for independent recognition/manipulation of light,pollution,chemicals,viruses and ***,the role that photonic engineering on a flexible platform plays in detecting or reacting to environmental changes is reviewed in terms of material selection,structural design,and regulation mechanisms from the ultraviolet to infrared spectral ***,issues emerging with the evolution of the wearable technology,such as Joule heating,battery durability,and user privacy,and the potential solution strategies are *** article provides a systematic review of current progress in wearable devices based on photonic structures as well as an overview of possible ubiquitous advances and their applications,providing diachronic perspectives and future outlook on the rapidly growing research field of wearable technology.

关键词： photonic structure wearable device health care device colorimetric sensor radiative cooling infrared camouflage

Ischemic colitis during interferon-ribavirin therapy for chronic hepatitis C:A case report

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World Journal of Gastroenterology 2012年第31期18卷 4233-4236页

作者： Su jung Baik Tae Hun Kim Kwon yoo Il hwan Moon Min-Sun Cho Department of Gastroenterology Health Promotion CenterYonsei University Gangnam Severance HospitalSeoul 158-050South Korea Department of Internal Medicine Ewha Medical Research InstituteEwha University Mokdong HospitalEwha Womans University School of MedicineSeoul 158-710South Korea Department of Pathology Ewha University Mokdong HospitalEwha Womans University School of MedicineSeoul 158-710South Korea

Ischemic colitis is a rare complication of interferon *** 9 cases in 6 reports have been described *** report describes a case of ischemic colitis during pegylated interferon and ribavirin treatment for chronic hepatitis C,and includes a review of the relevant literature.A 48-year-old woman was treated with pegylated interferon-2a and ribavirin for chronic hepatitis C,genotype *** 19 wk of treatment,the patient complained of severe afebrile abdominal pain with *** signs were stable and serum white blood cell count was within the normal *** computed tomography showed diffuse colonic wall thickening from the splenic flexure to the proximal sigmoid colon,which is the most vulnerable area for the development of ischemic *** revealed an acute mucosal hyperemic change,with edema and ulcerations extending from the proximal descending colon to the sigmoid *** mucosal biopsy revealed acute exudative *** chain reaction and culture for Mycobacterium tuberculosis were negative and the cultures for cytomegalovirus,Salmonella and Shigella species were *** discontinuation of interferon and ribavirin therapy,abdominal pain and hematochezia subsided and,following colonoscopy showed improvement of the mucosal *** colitis cases during interferon therapy in patients with chronic hepatitis C reported so far have all involved the descending *** colitis is a rarely encountered complication of interferon administration in patients with chronic hepatitis C and should be considered when a patient complains of abdominal pain and hematochezia.

关键词： Ischemia Hepatitis C Interferon

Ultrasonographic evaluation of the effect of extracorporeal shock wave therapy on calcific tendinopathy of the rectus femoris tendon:A case report

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World Journal of Clinical Cases 2019年第22期7卷 3772-3777页

作者： Chang Han Lee Min-Kyun Oh jun-Il yoo Department of Rehabilitation Medicine Gyeongsang National University School of Medicine and Gyeongsang National University HospitalJinju 52727South Korea Department of Orthopaedic Surgery School of MedicineGyeongsang National University90 ChilamdongGyeongsangnam-doJinju 52727South Korea

BACKGROUND Calcific tendinopathy denotes calcific deposits in a specific *** is also known as calcifying tendinitis,calcifying periarticulitis,or periarticular apatite deposition ***,extracorporeal shock wave therapy(ESWT)has been reported to be effective in relieving and treating pain in calcific *** SUMMARY A 36-year-old female patient suffered from left hip joint pain for six *** pain was increased during abduction of the hip,waking,and jumping.B-mode ultrasonography was performed by a physiatrist with an L12-5 linear transducer.A single session of ESWT was given in the marking area under ultrasound guidance at 4 Hz,2500 shots with intensity of stimulation using energy of 0.1 mJ/*** hip pain of the patient slowly decreased within 4 wk after starting the *** six weeks of ESWT,her hip pain was completely ***,the size of calcification showed almost no reduction in simple radiography at the final *** Ultrasonography is a very good modality not only for diagnosing calcified tendinitis by classical appearance,but also for evaluating the effect of ESWT during the follow-up period.

关键词： Rectus femoris Calcific tendinopathy Extracorporeal shock wave therapy Ultrasonography Hip Joint Case report

Materials and devices for flexible and stretchable photodetectors and light-emitting diodes

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Nano Research 2021年第9期14卷 2919-2937页

作者： jun-Kyul Song Min Sung Kim Seungwon yoo Ja Hoon Koo Dae-Hyeong Kim Center for Nanoparticle Research Institute for Basic Science(IBS)Seoul 08826Republic of Korea School of Chemical and Biological Engineering and Institute of Chemical Processes Seoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Program for Bioengineering Seoul National UniversitySeoul 08826Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea

Recently,significant efforts have been directed at overcoming the limitations of conventional rigid optoelectronic devices,particularly their poor mechanical stability under bending,folding,and stretching *** of major approaches for rendering optoelectronic devices mechanically deformable is to replace the conventional electronic/optoelectronic materials with functional nanomaterials or organic materials that are intrinsically flexible/***,advanced device designs and unconventional fabrication methods have also contributed to the development of soft optoelectronic ***,new devices such as bio-inspired curved image sensors,wearable light emitting devices,and deformable bio-integrated optoelectronic devices have been *** this review,recent progress in the development of soft optoelectronic materials and devices is ***,various materials such as nanomaterials,organic materials,and their hybrids that are suitable for developing deformable photodetectors,are ***,the nanomaterials and organic/polymeric materials that are applicable in deformable light-emitting diodes are ***,representative system-level applications of flexible and stretchable photodetectors and light-emitting diodes are reviewed,and future prospects are discussed.

关键词： nanomaterial organic material photodetector light-emitting diode flexible optoelectronics stretchable optoelectronics

Fucoidan protects hepatocytes from apoptosis and inhibits invasion of hepatocellular carcinoma by up-regulating p42/44 MAPK-dependent NDRG-1/CAP43

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Acta Pharmaceutica Sinica B 2015年第6期5卷 544-553页

作者： Yuri Cho jung-hwan yoon Jeong-ju yoo Minjong Lee Dong Hyeon Lee Eun Ju Cho Jeong-Hoon Lee Su Jong Yu yoon jun Kim Chung Yong Kim Department of Internal Medicine and Liver Research Institute Seoul National University College of Medicine

Fucoidan is a traditional Chinese medicine suggested to possess anti-tumor *** this study the anti-metastatic effects of fucoidan were investigated in vitro in human hepatocellular carcinoma(HCC) cells(Huh-7 and SNU-761) under normoxic and hypoxic conditions and in vivo using a distant liver metastasis model involving injection of MH134 cells into spleen via the portal *** ability to protect hepatocytes against bile acid(BA)-induced apoptosis was investigated in primary *** was found to suppress the invasion of HCC cells through up-regulation of p42/44 MAPKdependent NDRG-1/CAP43 and partly,under normoxic conditions,through up-regulation of p42/44MAPK-dependent VMP-1 *** also significantly decreased liver metastasis in *** regards its hepatoprotective effect,fucoidan decreased BA-induced hepatocyte apoptosis as shown by the attenuation of caspase-8,and-7 cleavages and suppression of the mobilization of caspase-8 and Fas associated death domain(FADD) into the death-inducing signaling *** summary,fucoidandisplays inhibitory effects on proliferation of HCC cells and protective effects on *** results suggest fucoidan is a potent suppressor of tumor invasion with hepatoprotective effects.

关键词： Fucoidan Hepatocellular carcinoma Invasion Hypoxia Hepatoprotective Cultured hepatocyte NDRG-1/CAP43 VMP-1

Comparison of ring 1 parameters in 37-segment multifocal electroretinography between onset and offset conditions of ring 2 to 4 in normal subjects

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International Journal of Ophthalmology(English edition) 2019年第1期12卷 73-78页

作者： jun Ho yoo Cheolmin Yun Jaeryung Oh Seong-Woo Kim Department of Ophthalmology Korea University College of Medicine

AIM: To investigate whether the response of a central hexagonal element corresponding to the macular area in conventional multifocal electroretinography(mfERG) tests was the same as that of experimental mfERG using single central hexagonal element stimulation. METHODS: Prospective, observational study. Thirty healthy subjects were included in this study. mfERG recordings were performed according to two protocols: stimulus with 37 hexagonal elements(protocol 1), and stimulus with a single central element created by deactivating the other 36 hexagonal elements(protocol 2). We compared differences between ring 1 parameters in each protocol. RESULTS: In protocol 1, the first positive component(P1) implicit time and P1 amplitude were 37.8±1.8 ms and 6.3±2.7 μV. After single element stimulation(protocol 2), double positive waves appeared. The implicit time and amplitude of P1 were 40.7±2.4 ms(P<0.001) and 9.1±3.3 μV(P=0.001), respectively. The implicit time and amplitude of the second positive component(P2) were 68.0±4.5 ms(P<0.001, compared with P1 in protocol 1) and 12.3±4.7 μV(P<0.001, compared with P1 in protocol 1), respectively. The amplitude of P2 in protocol 2 was about two times higher than that of P1 in protocol 1. CONCLUSION: mfERG responses of a central hexagonal element in a single element stimulation protocol are different from those of multiple element stimulation. The positive wave is more enhanced compared to that of the conventional protocol and it elongated into two wavelets.

关键词： multifocal electroretinography focal electroretinography macular function single element stimulation stray light effect

Investigation of transient and heterogeneous micro-climate around a human body in an enclosed personalized work environment

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能源与人工环境(英文) 2020年第4期1卷 423-431页

作者： Chong Wang Sung-jun yoo Shin-ichi Tanabe Kazuhide Ito Interdisciplinary Graduate School of Engineering Sciences Kyushu UniversityJapan Faculty of Engineering Sciences Kyushu UniversityJapan Faculty of Science and Engineering Waseda UniversityJapan

Heterogeneous distribution of indoor environmental quality is known to have a great impact on human health,comfort,and productivity.A personalized work environment,that creates a localized and independent environ-ment with capsules or partitions,is being developed worldwide to provide workers with a space that enables undisturbed concentration on studying and ***,the minimized interior space of a personalized work environment can immediately cause adverse health impacts for occupant if the air quality and thermal en-vironment in the personalized work environment is not controlled ***,constant breathing can sharply increase the CO 2 concentrations in an interior space with an insufficient ventilation *** order to design a healthy and comfortable indoor environment,especially in a personalized work environment,it is important to predict precisely and comprehensively the transient and heterogeneous structure of the indoor envi-ronment formed around a human *** this background,we have developed an in silico human model that integrates a computational human model(virtual manikin combined with thermoregulation models)and respi-ratory model(virtual airway)for estimating indoor environmental quality,targeting the microclimate around a human body and breathing zone with high *** this study,we report the applicability of a comprehensive in silico human model to estimate the environ-mental quality in a personalized work environment.A coupled analysis of heat and contaminant transfer with computational fluid dynamics was conducted targeting the space around the in silico human model installed in a virtual personalized work *** informative data including human thermal comfort and breathing air quality were obtained,potentially forming the basis for the development of a digital twin of the personalized work environment and contributing to the design of a healthy,comfortable,and productive personalized work environme

关键词： Microclimate Indoor environment Digital twin Personalized work environment Computational fluid dynamics in silico human model

Study of engineering electronic structure modulated non-noble metal oxides for scaled-up alkaline blend seawater splitting

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Journal of Energy Chemistry 2023年第11期86卷 167-179,I0004页

作者： Natarajan Logeshwaran Subramanian Vijayapradeep Ae Rhan Kim Prabhakaran Sampath Shanmugam Ramakrishnan Milan Babu Poudel Do hwan Kim Dong Jin yoo Graduate School Department of Energy Storage/Conversion Engineering(BK21 FOUR)Hydrogen and Fuel Cell Research CenterJeonbuk National University567-Baekje-daeroDeokjin-guJeonju-siJeollabuk-do 54896Republic of Korea Department of Life Science Jeonbuk National University567-Baekje-daeroDeokjin-guJeonju-siJeollabuk-do 54896Republic of Korea Division of Science Education and Institute of Fusion Science Jeonbuk National University567-Baekje-daeroDeokjin-guJeonju-siJeollabuk-do 54896Republic of Korea Department of Nano Convergence Engineering Jeonbuk National University567-Baekje-daeroDeokjin-guJeonju-siJeollabuk-do 54896Republic of Korea School of Engineering Merz CourtNewcastle UniversityNE17RUUnited Kingdom

Scaled-up industrial water electrolysis equipment that can be used with abundant seawater is key for affordable hydrogen *** search for highly stable,dynamic,and economical electrocatalysts could have a significant impact on hydrogen ***,we prepared energy-efficient,scalable,and engineering electronic structure modulated Mn-Ni bimetal oxides(Mn_(0.25)Ni_(0.75)O)through simple hydrothermal followed by calcination ***-optimized Mn_(0.25)Ni_(0.75)O displayed enhanced oxygen and hydrogen evolution reaction(OER and HER)performance with overpotentials of 266 and115 mV at current densities of 10 mA cm^(-2)in alkaline KOH added seawater electrolyte ***,Mn-Ni oxide catalytic benefits were attributed to the calculated electronic configurations and Gibbs free energy for OER,and HER values were estimated using first principles *** real-time practical application,we mimicked industrial operating conditions with modified seawater electrolysis using Mn_(0.25)Ni_(0.75)O‖Mn_(0.25)Ni_(0.75)O under various temperature conditions,which performs superior to the commercial IrO_(2)‖Pt-C *** findings demonstrate an inexpensive and facile technique for feasible large-scale hydrogen production.

关键词： Waterel ectrolysis Mn-Ni oxide complex Chlorine evolution reaction Industrial seawater operations Density functional theory calculations

Effect of gadolinium incorporation on optical characteristics of YNbO_4:Eu^(3+) phosphors for lamp applications

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Journal of Rare Earths 2012年第3期30卷 205-209页

作者： Sung hwan Choi G. Anoop Dong Wook Suh Kyung Pil Kim Hyun Ju Lee Jae Soo yoo Display Materials Laboratory School of Chemical Engineering and Materials Science Chung-Ang University

Eu3＋-doped （Y,Gd）NbO4 phosphor was synthesized by solid-state reaction for possible application in cold cathode fluorescent lamps. A broad absorption band with peak maximum at 272 nm was observed which was due to the charge transfer between Eu3＋ ions and neighboring oxygen anions. A deep red emission at the peak wavelength of 612 nm was observed which could be attributed to the 5D0→7F2 transition in Eu3＋ ions. The highest luminance for Y1-x-yGdyNbO4：Eux3＋ under 254 nm excitation was achieved at Eu3＋ concentration of 18 mol.% （x=0.18） and Gd3＋ concentration of 8.2 mol.% （y=0.082）. The luminance of Y0.738Gd0.082NbO4：Eu3＋0.18 was higher than that of a typical commercial phosphor Y2O3：Eu3＋ and the CIE chromaticity coordinate was （0.6490, 0.3506）, which was deeper than that of Y2O3：Eu3＋. The particle size of the synthesized phosphors was controlled by the NaCl flux and particle size as high as 8 μm with uniform size distribution of particles was obtained.

关键词： YNbO4:Eu oxide phosphors rare earths