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Effects of elevation on shoulder joint motion: comparison of dynamic and static conditions
Takaki Imai,Takashi Nagamatsu,Junichi Kawakami,Masaki Karasuyama,Nobuya Harada,Yu Kudo,Kazuya Madokoro 대한견주관절의학회 2023 대한견주관절의학회지 Vol.26 No.2
Background: Although visual examination and palpation are used to assess shoulder motion in clinical practice, there is no consensus on shoulder motion under dynamic and static conditions. This study aimed to compare shoulder joint motion under dynamic and static conditions. Methods: The dominant arm of 14 healthy adult males was investigated. Electromagnetic sensors attached to the scapular, thorax, and humerus were used to measure three-dimensional shoulder joint motion under dynamic and static elevation conditions and compare scapular upward rotation and glenohumeral joint elevation in different elevation planes and angles. Results: At 120° of elevation in the scapular and coronal planes, the scapular upward rotation angle was higher in the static condition and the glenohumeral joint elevation angle was higher in the dynamic condition (P<0.05). In scapular plane and coronal plane elevation 90°–120°, the angular change in scapular upward rotation was higher in the static condition and the angular change in scapulohumeral joint elevation was higher in the dynamic condition (P<0.05). No differences were found in shoulder joint motion in the sagittal plane elevation between the dynamic and static conditions. No interaction effects were found between elevation condition and elevation angle in all elevation planes. Conclusions: Differences in shoulder joint motion should be noted when assessing shoulder joint motion in different dynamic and static conditions.
Masaki Karasuyama,Masafumi Gotoh,Keiji Tahara,Junichi Kawakami,Kazuya Madokoro,Takashi Nagamatsu,Takaki Imai,Nobuya Harada,Yu Kudo,Naoto Shiba 대한견주관절학회 2020 대한견주관절의학회지 Vol.23 No.2
Background: Several systematic reviews have reported on the conservative treatment of full-thickness rotator cuff tears; however, clinical results of this treatment still remain determined. Methods: PubMed, Cochrane Library, PEDro, and CINAHL databases were systematically searched for randomized clinical trials and observational studies. Two independent researchers reviewed a total of 2,981 articles, 28 of which met the criteria for inclusion in the study. Clinical outcome measures included Constant score, visual analog scale score for pain, range of motion, and short-form 36. The meta-analysis used a linear mixed model weighted with the variance of the estimate. Results: The meta-analysis showed a significant improvement after surgery. Pain score is 26.2 mm (1 month) to 26.4 mm (3 months) and 24.8 mm (12 months) (P
허만규,TAKAKI MASAKI,최병기,이진형,강광충,임철탁,윤대호 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.3
To improve the electrical properties of multilayer ceramic capacitors, triple (Mg/Dy/Si) oxides coating on the surfaces of 150-nm BaTiO3 (BT) particles was conducted by using the thermal hydrolysis method. Multi-layer (5 layers) ceramic capacitors(MLCCs) of triple oxides coated BT (TOBT) particles were obtained by using green sheet process and their electricalproperties were measured. The MLCCs of TOBT particles gave a better stable dielectric constant and dissipation factor forthe sintering temperature compared with those of the reference specimen prepared by using mixing process. In addition, astable temperature coefficient of capacitance (TCC) was obtained. The morphology and homogeneity of TOBT particles weremeasured by using scanning transmission electron microscope-high angle annular dark field (STEM-HAADF) and energydispersive X-ray spectroscopy (EDX).
김수종,TAKAKI MASAKI,최승희,윤대호 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.4
The nano-sized Y1XVO4 : EuX3+ powders were synthesized by impregnation method using starch and metal salts(Y;YCl3 • 6H2O,V;VOSO4 • 6H2O, Eu;EuCl3 • 6H2O) as starting materials. The synthesized powders were characterized by XRD, FE-SEM andPhotoluminescence. The particle size of the powders were controlled by preparation conditions, such as heat treatmenttemperature and concentration of Eu ion. As a result of the various synthesis conditions, 30 ~ 100 nm sized homogeneousY1XVO4 : EuX3+ particles were obtained at 600-800 oC for 3 hour. Crystallization and the growth of particles were acceleratedwith increasing sintering temperature and concentration of Eu ion. Crystallization of Y1XVO4 : EuX3+ started around 500 oC,which the temperature is pyrolysis of starch, tetragonal phase generated at 600 oC. Moreover, above 600 oC, heat treatment timehad influence on particle growth, and change of the concentration of Eu ion had also influence on growth of a crystal. Emissionintensity of Y1XVO4 : EuX3+ particles were enhanced with increasing heat treatment temperature and concentration of Eu ion.
Synthesis of down-converting red emission Ca14Zn6Al10-xMnxO35 phosphors for use in solar cells
허만규,Takaki Masaki,Kenji Toda,윤대호 한양대학교 세라믹연구소 2014 Journal of Ceramic Processing Research Vol.15 No.3
Ca14Zn6Al10-xMnxO35 (x = 1, 3, 5 mol%, CZAMO) phosphor materials were synthesized using the liquid phase precursor (LPP) method. Nanostructrued cellulose was impregnated with metal-hydrate solution and then calcined to vaporize the cellulose. The impregnated cellulose was fired at 800 to 1200 o C to give the CZAMO phosphors. The particle size and crystal structure of the phosphors were analyzed by FE-SEM and XRD. Nano-sized particles with a dominant Ca14Zn6Al10O35 structure (100 nm) were obtained by firing at 800 o C for 1 h. The red emission wavelength of the phosphors ranged from 650 to 750 nm, peaking at 713 nm.
Synthesis of Eu, Dy co-doped SrAl2O4 phosphors by using liquid phase precursor process
로윤아,송영현,Takaki Masaki,윤대호 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.4
SrAl2O4: Eu2+, Dy3+s are well-known as persistent luminescence phosphors with high brightness and long afterglow. They havebeen widely commercialized for afterglow applications such as security signs, emergency route signage, identification markers,and also bio-image in vivo. The persistent researches of SrAl2O4:Eu2+, Dy3+ phosphor have been widely studied during the pastdecades. In this study, the properties of SrAl2O4: Eu2+, Dy3+ phosphor were studied with wide range firing temperature anddifferent annealing conditions. Synthesis of persistent phosphorescence in Eu2+ and Dy3+ ions co-doped SrAl2O4 phosphorsfired at 1100-1300 oC was conducted by using the cellulose assisted liquid phase precursor (LPP) process under reducingatmosphere. The SrAl2O4: Eu2+ showed a typically broad emission band at 512 nm under excitation of UV range and Dy3+considerably enhanced the persistent luminescence intensity. Europium ions substituted for the two different Sr sites in thephosphor’s the monoclinic of host lattice resulting in greenish emission. The obtained phosphors were measured and analyzedby X-ray diffraction (XRD), scanning electron microscope (FE-SEM) and photoluminescence spectra (PL).
Effect of Bi(Mg1/2Ti1/2)O3 Addition on the Electrical Properties of Si-Mn Modified on SrTiO3
Yoon-ah Roh,Takaki Masaki,윤대호 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.9
Single-Crystalline Strontium titanate (SrTiO3) has been widely used in many fields such as catalyst, semiconductors and dielectrics. SrTiO3 is a typical perovskite-type oxide, the physical properties of which strongly depend on its chemical composition, structure, shape, size, and crystallinity. In this work, the effects of Bi(Mg1/2Ti1/2)O3 addition on the nanostructure and the dielectric properties of Si-Mn modified SrTiO3 were investigated to develop nano-sized particles and lowtemperature- fired SrTiO3-based ceramics with stable temperature characteristics. The dielectric constant of SrTiO3-Bi(Mg1/2Ti1/2)O3 was found to range from 900 to 1200 at 1 kHz for samples sintered at 1200 ◦ C. This new composition, SrTiO3-Bi(Mg1/2Ti1/2)O3, can be applied as a nano-sized dielectric materials in various fields.
김봉성,이민지,Takesi Abe,TAKAKI MASAKI,송영현,Kenji Toda,윤대호 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.4
BaAl2Si2O8: Eu2+ + xSiO2 (x = 0, 1, 2 and 3) has been synthesized with phosphors via novel liquid phase precursor (LPP)method. The best crystalline BaAl2Si2O8 : Eu2+ phosphor could not be synthesized as the calcination temperature is inadequatefully to crystalize the phosphor leading to the crystal and amorphous. Albeit, the firing temperature is insufficient so as to formthe fine crystal, the added excess SiO2 could act as an additive for the crystallization of the phosphor. As a function of SiO2,the size of the crystal has been augmented and formed fine crystals with the concentration of added SiO2. Moreover, the addedexcess SiO2 makes SiOC : Eu2+ phosphor as a deep blue illumination at 440 nm. Photoluminescence intensity of the phosphorsis increased continuously by the addition of SiO2 heretofore x = 3. In the present investigation, an attempt has been made tosynthesize and observe carefully for photoluminescence properties with regard to the crystalline structure, optical propertyand surface morphology.
윤대호,WOO JUNG PARK,TAKAKI MASAKI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2009 NANO Vol.4 No.3
This paper reports an approach for enhancing the luminescent properties of Y2O3:Eu3+ nanophosphors with cellulose, using a liquid phase precursor (LPP) process. The nanosized particles showed a powder X-ray diffraction pattern, corresponding to the reference, and were highly crystalline. The grain sizes of the samples synthesized at 600°C for 1 h were estimated to be approximately 19 nm. The particle sizes of the samples increased with increasing synthesis temperature and the morphology was cleaned and without impurities. In addition, all the samples had a smaller particle size than that of the commercial product. The PL spectrum consisted of weak bands at 581, 587, 593, and 599 nm, corresponding to the 5D0 → 7F1 transition, and sharp peaks with a maximum intensity occurring at approximately 610 nm, due to the 5D0 → 7F2 transition of Eu3+. These results suggest that Y2O3:Eu3+ is a promising alternative red-emitting phosphor for high efficiency resolution display applications.
송예림,최승희,김수종,송영현,TAKAKI MASAKI,윤대호 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.3
For the high luminescent efficiency, nano sized Eu3+ doped Y(P,V)O4 phosphors are the promising red-emitting candidates forsolar cell. In this study, Y0.92Eu0.08(P0.508V0.452)O4 of particle size of ~ 100 nm were obtained with high PL intensity by using thecellulose assisted liquid phase precursor process. Their excitation and emission spectra were analyzed. Crystal structure andparticle morphologies of obtained phosphors were measured and analyzed w