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      • Eu<sup>3+</sup> doped lutetium molybdenum oxides: Synthesis, optical properties, thermal behavior, and LED packaging

        Cao, Chunyan,Xie, Along,Zhou, Tianliang,Zhong, Haichang,Lu, Xiangjun,Xie, An,Noh, Hyeon Mi,Jeong, Jung Hyun Elsevier 2020 Journal of luminescence Vol.217 No.-

        <P><B>Abstract</B></P> <P>Some lutetium molybdenum oxides were synthesized through a solid-state reaction method. By adjusting the molar ratios of raw materials of Lu<SUB>2</SUB>O<SUB>3</SUB> (Eu<SUB>2</SUB>O<SUB>3</SUB>) to MoO<SUB>3</SUB>, Eu<SUP>3+</SUP> doped lutetium molybdenum oxides Lu<SUB>2</SUB>MoO<SUB>6</SUB>, Lu<SUB>2</SUB>Mo<SUB>2</SUB>O<SUB>9</SUB>, Lu<SUB>2</SUB>(MoO<SUB>4</SUB>)<SUB>3</SUB>, and Lu<SUB>6</SUB>MoO<SUB>12</SUB> were obtained. The materials were characterized by X-ray diffraction (XRD) patterns, scanning electron microscope (SEM) images, energy-dispersive spectra (EDS), diffuse reflection (DR) spectra, photoluminescence (PL) excitation and emission spectra, luminescence decay curves, and temperature dependent integrated emission spectra. Enhanced excitation and emission spectra were recorded at high temperatures. Possible energy transfer processes were proposed to explain the excitation and emission spectra. By combining some phosphors with near ultraviolet (NUV) chips, the obtained light emitting diodes (LEDs) gave red light under forward bias current. The results suggest that the obtained Eu<SUP>3+</SUP> doped lutetium molybdenum oxides have potential applications in phosphor converted based NUV LEDs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Eu<SUP>3+</SUP> doped Lu<SUB>2</SUB>MoO<SUB>6</SUB>, Lu<SUB>2</SUB>Mo<SUB>2</SUB>O<SUB>9</SUB>, Lu<SUB>2</SUB>(MoO<SUB>4</SUB>)<SUB>3</SUB>, and Lu<SUB>6</SUB>MoO<SUB>12</SUB> were obtained. </LI> <LI> The materials present different structures, morphologies, optical properties, and luminescece decay behaviors. </LI> <LI> Eu<SUP>3+</SUP> concentration dependent optical properties in Lu<SUB>2</SUB>MoO<SUB>6</SUB> were researched. </LI> <LI> Enhanced excitation and emission spectra were recorded under high temperatures in some materials. </LI> <LI> Red LEDs were obtained by packaging phosphors to NUV LED chips. </LI> </UL> </P>

      • The observation of children`s holding position to redesign elementary school chair for easy carrying and moving

        Lulu’ Purwaningrum,Satoshi Muraki 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5

        Objectives. Carrying and moving chairs enable and improve learning activities at school, which leads to better quality of education. At elementary schools in Indonesia and other developing countries, only one size of chair has been used for all ages and grades, therefore, making it heavy for younger children. The objective of the present study was to observe the motion of carrying and moving an elementary school chair by children. Methods. A total of 41 children consisting of 16 Indonesian and 25 Japanese children (17 boys and 24 girls) aged 6, 7, 8 and 9 participated in this study. We used three elementary school chairs (1 Indonesian and 2 Japanese chairs). The participants carried and moved the chairs 3 m with an ordinary speed, and were allowed to hold any part of the chair that was convenient for them. We recorded their motion when carrying and moving the chair. Results. The chair was carried at the side or in front of the child’s body, and the chair being in a lateral position is the most popular method of carrying and moving (75%). In all methods, participants showed a preference in using two particular chair parts to hold the chair. Conclusions. Careful consideration is needed on the design of elementary school chairs from the perspective of the main methods and holding pattern for carrying and moving them, especially heavy chairs that are used in elementary schools in Indonesia.

      • The Observation of Children`s Holding Position to Redesign Elementary School Chair for Easy Carrying and Moving

        ( Lu`lu` Purwaningrum ),( Satoshi Muraki ) 한국감성과학회 2014 춘계학술대회 Vol.2014 No.-

        Objectives. Carrying and moving chairs enable and improve learning activities at school, which leads to better quality of education. At elementary schools in Indonesia and other developing countries, only one size of chair has been used for all ages and grades, therefore, making it heavy for younger children. The objective of the present study was to observe the motion of carrying and moving an elementary school chair by children. Methods. A total of 41 children consisting of 16 Indonesian and 25 Japanese children (17 boys and 24 girls) aged 6, 7, 8 and 9 participated in this study. We used three elementary school chairs (1 Indonesian and 2 Japanese chairs). The participants carried and moved the chairs 3 m with an ordinary speed, and were allowed to hold any part of the chair that was convenient for them. We recorded their motion when carrying and moving the chair. Results. The chair was carried at the side or in front of the child`s body, and the chair being in a lateral position is the most popular method of carrying and moving (75%).

      • KCI등재

        The Influence of Cigarette Smoke on the Epithelium of the Vestibule: an Electron Microscopic Study

        Mukaddes E?refo?lu,Erol Selimo?lu,Muammer E?refo?lu,?zgen Vuraler 연세대학교의과대학 2003 Yonsei medical journal Vol.44 No.4

        It is known that cigarette smoke induces cytological alterations on the respiratory and olfactory mucosa of the nasal cavity. We evaluated whether cigarette smoking had adverse effects on the epithelium of the vestibule, in the absence of any published ultrasutructural studies. We evaluated ten patients suffering from septum deviation, eight of whom were long-term smokers. While each layer of the epithelium obtained from the non-smokers consisted of a homogeneous cell population, each from the long-term smokers consisted of a heterogeneous cell population. The most prominent changes occurred in the shape and size of the cells and nuclei, the number and length of the cytoplasmic projections, the number and distribution pattern of the desmosomes, and the width of the intercellular spaces. We concluded that cigarette smoke produces hyperplastic and dysplastic changes, important factors related with cancer development, on the epithelium of the vestibule.

      • KCI등재

        Effects of α-Si₃N₄ seeds and sintering additives on properties of porous silicon nitride ceramics fabricated by carbothermal reduction

        Yuan Lu,Ji-Qiang Gao,Jian-feng Yang 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.6

        In this paper, porous Si3N4 ceramics were fabricated by carbothermal reduction between silicon dioxide and carbon [1]. The influences of α-Si3N4 seeds and sintering additives on the microstructure and mechanical properties of porous Si3N4 ceremics were investigated. XRD analysis proved the complete formation of a single-phase β-Si3N4. SEM analysis showed that the resultant porous Si3N4 ceramics had a fine microstructure and a uniform pore structure. The sintered sample with Lu2O3 as sintering additive showed finer, higher aspect ratio β-Si3N4 grains. The addition of Eu2O3 accelerated the densification of porous Si3N4 ceramics, decreased the porosity and increased the flexural strength. The addition of α-Si3N4 seeds accelerated the formation of the α-Si3N4 phase at a low temperature and the α-β phase transformation process at a high temperature. With an increase in the α-Si3N4 seeds content, the porosity decreased, and the flexural strength increased accordingly. In this paper, porous Si3N4 ceramics were fabricated by carbothermal reduction between silicon dioxide and carbon [1]. The influences of α-Si3N4 seeds and sintering additives on the microstructure and mechanical properties of porous Si3N4 ceremics were investigated. XRD analysis proved the complete formation of a single-phase β-Si3N4. SEM analysis showed that the resultant porous Si3N4 ceramics had a fine microstructure and a uniform pore structure. The sintered sample with Lu2O3 as sintering additive showed finer, higher aspect ratio β-Si3N4 grains. The addition of Eu2O3 accelerated the densification of porous Si3N4 ceramics, decreased the porosity and increased the flexural strength. The addition of α-Si3N4 seeds accelerated the formation of the α-Si3N4 phase at a low temperature and the α-β phase transformation process at a high temperature. With an increase in the α-Si3N4 seeds content, the porosity decreased, and the flexural strength increased accordingly.

      • KCI등재
      • KCI등재후보

        Dot Idea (.IDEA): A New Concept for an Incubation Program and Open Innovation Based on User Needs

        Luís Felipe Maldaner,Luísa Simon,Carlos Eduardo de Souza Aranha 세계과학도시연합 2018 World Technopolis Review Vol.7 No.2

        This paper discussed the application process of the Dot Idea program. The Dot Idea program is an incubation and open innovation program co-created by Unitec, an incubator at Tecnosinos Tech Park, and an SAP innovation team. The main objective of this study was to cover an existing gap in the literature regarding the practical application of an open innovation methodology. Many companies seek interaction with external parties to enable advancement toward identified innovation opportunities. Technology clusters, parks, and incubators have played an important role in promoting connections and interaction. Consequently, the Dot Idea program emerged as a result of a joint effort to create a program using a design science research methodology aiming to foster new businesses and strengthen Brazil and Latin America as a hub to develop new solutions for traditional organizations. In regards to lessons learned, the Dot.health trial had some success but also experienced difficulties; these related to the relationships between startups and a hospital’s internal teams, and startups’ needs to be funded from the beginning in order to be fully dedicated to a project.

      • SCISCIE

        Syntheses, Structures, and Characterization of Quaternary Tellurites, Li<sub>3</sub>MTe<sub>4</sub>O<sub>11</sub> (M = Al, Ga, and Fe)

        Lü,, Minfeng,Jo, Hongil,Oh, Seung-Jin,Lee, Suheon,Choi, Kwang-Yong,Yu, Yang,Ok, Kang Min ACS AMERICAN CHEMICAL SOCIETY 2017 Inorganic Chemistry Vol.56 No.10

        <P>Three new quaternary lithium metal tellurites, Li3MTe4O11 (M = Al, Ga, and Fe), have been synthesized through hydrothermal and solid-state reactions by heating a mixture of LiOH center dot H2O, TeO2, and M2O3. The structures of the title compounds have been determined by single-crystal and powder X-ray diffraction. Li3MTe4O11 reveal three-dimensional (3D) frameworks that consist of MO6 octahedra, TeO3 trigonal pyramids, and TeO4 polyhedra. The variable coordination mode of Te4+ within the framework leads to the formation of 1D channels that host Li+ cations on both tetrahedral and octahedral sites. The bulk and grain boundary Li+ ion conductivities for a Li3FeTe4O11 pellet in open air are estimated to be 1.0 x 10(-4) and 2.7 x 10(-6) S cm(-1), respectively, at room temperature from the impedance profile analysis. A lower activation energy of 19.9 kJ mol(-1) is obtained for the system, which is similar to that of Li10GeP2S12 (24 kJ mol(-1)). Detailed characterizations such as thermal, spectroscopic, and magnetic properties for the reported materials are also reported.</P>

      • KCI등재

        Litigation in Vietnamese Criminal Procedure and the Judicial Reform

        Lu’o’ng Thi My Quỳnh 전남대학교 법학연구소 2014 법학논총 Vol.34 No.1

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        Vietnam is actively implementing judicial reform strategy to 2020. To fit the generaltrend of the world integration, including orientation to complement the legal system,one of the priorities of judicial reform in Vietnam is: “Improving the quality of theprosecutors at trial, guaranteeing democratic litigation with lawyer, defense counsel andpeople involving in the proceedings…. The judgment of the Court must be basedprimarily on the results of litigation at the trial…”. By pointing out and analyzingspecific rules of Vietnam Criminal Procedure law, the author made comments andreviews on the role of litigation in Vietnam criminal proceedings in the context ofimplementing the judicial reform strategy.

      • KCI등재후보

        2D evaluation of crack openings using smeared and embedded crack models

        André Luís Gamino,Osvaldo Luís Manzoli,José Luiz Antunes de Oliveira e Sousa,Túlio Nogueira Bittencourt 사단법인 한국계산역학회 2010 Computers and Concrete, An International Journal Vol.7 No.6

        This work deals with the determination of crack openings in 2D reinforced concrete structures using the Finite Element Method with a smeared rotating crack model or an embedded crack model. In the smeared crack model, the strong discontinuity associated with the crack is spread throughout the finite element. As is well known, the continuity of the displacement field assumed for these models is incompatible with the actual discontinuity. However, this type of model has been used extensively due to the relative computational simplicity it provides by treating cracks in a continuum framework, as well as the reportedly good predictions of reinforced concrete members’ structural behavior. On the other hand, by enriching the displacement field within each finite element crossed by the crack path, the embedded crack model is able to describe the effects of actual discontinuities (cracks). This paper presents a comparative study of the abilities of these 2D models in predicting the mechanical behavior of reinforced concrete structures. Structural responses are compared with experimental results from the literature, including crack patterns, crack openings and rebar stresses predicted by both models.

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