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A Wireless Intraocular Pressure Sensor with Variable Inductance Using a Ferrite Material
Kang, Byungjoo,Hwang, Hoyong,Lee, Soo Hyun,Kang, Ji Yoon,Park, Joung-Hu,Seo, Chulhun,Park, Changkun The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.4
A wireless intraocular (IOP) pressure sensor based on micro electro mechanical system (MEMS) technology is proposed. The proposed IOP sensor uses variable inductance according to the external pressure. The proposed sensor is composed of two flexible membranes: a ferrite bottom part, an inductor, and a capacitor. The inductance of the sensor varies according to the external pressure. The resonance frequency of the sensor is also varied, and this frequency is detected using an external coil. The external coil is designed with an FR-4 printed circuit board. The feasibility of the proposed sensor structure using variable inductance to detect the external pressure is successfully demonstrated.
A Wireless Intraocular Pressure Sensor with Variable Inductance Using a Ferrite Material
Byungjoo Kang,Hoyong Hwang,Soo Hyun Lee,Ji Yoon Kang,Joung-Hu Park,Chulhum Seo,Changkun Park 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.4
A wireless intraocular (IOP) pressure sensor based on micro electro mechanical system (MEMS) technology is proposed. The proposed IOP sensor uses variable inductance according to the external pressure. The proposed sensor is composed of two flexible membranes: a ferrite bottom part, an inductor, and a capacitor. The inductance of the sensor varies according to the external pressure. The resonance frequency of the sensor is also varied, and this frequency is detected using an external coil. The external coil is designed with an FR-4 printed circuit board. The feasibility of the proposed sensor structure using variable inductance to detect the external pressure is successfully demonstrated.
姜秉周 忠南大學校 地域開發硏究所 1996 地域開發論叢 Vol.8 No.-
Korea has achieved a remarkable growth in industry for the last 30 year. However, as time passed, Korean industrial competitive power is decreasing. One of the major reasons in these is due to the lack of investment in infrastructure such as roads, airports, seaports, warehouses, freight terminal, railroads etc. The aim of this research is to analyze the status of infrastructure in the area of conveying the freight, problems in terminal system and to figure out new system to enhance the competitive power in industry at national and local level. Eight problems were found in freight conveying system in Korea. Some problems stemed from management skill in terminal facilities, however majority of problems stemed from lack of investment in warehouses and roads. Five Strategies are suggested for the betterment of terminal system in this paper.
Kang, Eungyu,Park, Hae Ri,Yoon, Jeongbin,Yu, Hyo-Yeon,Chang, Suk-Kyu,Kim, Byungjoo,Choi, Kihwan,Ahn, Sangdoo Elsevier 2018 Microchemical journal Vol.138 No.-
<P><B>Abstract</B></P> <P>A simple and general method which relies on chemical shift difference between water and solvent peaks in <SUP>1</SUP>H NMR spectroscopy has been developed for the determination of water content in organic solvent. As the water content is increased, the water proton peak is shifted to down-field because the water is involved in the more hydrogen bonding. The linear relation between water content and chemical shift difference was used to assess the water content in organic solvent. The intrinsic water and solvent proton peak was used, thus no additional reagents was necessary. The developed method has been applied to six organic solvents having various chemical properties. Furthermore, temperature effect was investigated and correction factor was evaluated. We propose that this new method will be useful for wide range of applications requiring accurate and convenient assessment of water content in organic solvents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Water content in organic solvent was assessed using chemical shift difference between water and organic solvent. </LI> <LI> Observing chemical shift difference did not require elaborate optimizations of the acquisition and processing parameters. </LI> <LI> The equation having correction factor for temperature effect was derived and applied to independent NMR instrument. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
중등수학 예비교사들의 통계적 소양 : 표본 개념에 대한 이해를 중심으로
탁병주 ( Tak Byungjoo ),구나영 ( Ku Na-young ),강현영 ( Kang Hyun-young ),이경화 ( Lee Kyeong-hwa ) 한국수학교육학회 2017 수학교육 Vol.56 No.1
Taking samples of data and using samples to make inferences about unknown populations are at the core of statistical investigations. So, an understanding of the nature of sample as statistical thinking is involved in the area of statistical literacy, since the process of a statistical investigation can turn out to be totally useless if we don`t appreciate the part sampling plays. However, the conception of sampling is a scheme of interrelated ideas entailing many statistical notions such as repeatability, representativeness, randomness, variability, and distribution. This complexity makes many people, teachers as well as students, reason about statistical inference relying on their incorrect intuitions without understanding sample comprehensively. Some research investigated how the concept of a sample is understood by not only students but also teachers or preservice teachers, but we want to identify preservice secondary mathematics teachers` understanding of sample as the statistical literacy by a qualitative analysis. We designed four items which asked preservice teachers to write their understanding for sampling tasks including representativeness and variability. Then, we categorized the similar responses and compared these categories with Watson`s statistical literacy hierarchy. As a result, many preservice teachers turned out to be lie in the low level of statistical literacy as they ignore contexts and critical thinking, expecially about sampling variability rather than sample representativeness. Moreover, the experience of taking statistics courses in university did not seem to make a contribution to development of their statistical literacy. These findings should be considered when design preservice teacher education program to promote statistics education.
멀티미디어 디지털 기기와 연결되는 스마트폰을 활용한 개인 맞춤형 광고 연구
강민구 ( Mingu Kang ),김병주 ( Byungjoo Kim ),김현일 ( Hyunil Kim ),정도윤 ( Minjae Jung ),이석기 ( Seokkee Lee ),노광현 ( Kwanghyun Ro ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1
본 논문에서는 멀티미디어 디지털 기기와 스마트폰 어플리케이션의 통신을 통한 개인 맞춤형 광고에 대해 연구하였다. 디지털 기술의 발전으로 TV, 인터넷, 디지털 사이니지 등 광고를 적용 할 수 있는 분야가 다양해지고 있지만, 광고를 대처하는 방법은 광고에 나오는 정보를 검색해서 구매하는 방식을 넘어서는 크게 발전하지 않았다. 이러한 발전의 제약을 해소하고자 광고를 효율적으로 활용하기 위한 방법을 연구하였다. 본 연구에서는 디지털 기기에서 보여주는 광고 정보를 블루투스 통신을 통해 스마트폰 어플리케이션에 정보를 전달해주고 어플리케이션은 광고에서 받은 정보를 자신의 선호도 및 필요정도에 따라 저장 및 구매까지 바로 할 수 있는 방법을 연구하였다. 향후 와이파이 통신 연결 개발을 통해 1:1 통신이 아닌 1:多인 연결로 광고 정보를 전달하여 여러 사용자가 동시에 광고에 대한 정보를 활용 할 수 있도록 할 것이다.
Resonance frequency effects of an external coil for IOP sensor applications
Hwang, Hoyong,Kang, Byungjoo,Lee, Soo Hyun,Jang, Cheol-In,Kang, Ji Yoon,Park, Changkun Informa UK (TaylorFrancis) 2014 Journal of electromagnetic waves and applications Vol.28 No.7
In this study, we investigate the resonant frequency effects of an external coil for a wireless intraocular pressure (IOP) monitoring system. The phase difference of an IOP sensor is improved using the resonant frequency of the external coil. By means of phasor diagrams, we show that the phase difference is improved as the resonant frequency of the external coil approaches the resonant frequency of the IOP sensor. The IOP sensor and a multi-layered external coil are designed using microfabrication technology and an FR-4 printed circuit board, respectively. The resonant frequency of the external coil is varied using an additional capacitor and by changing the number of layers of the multi-layered inductor pattern. From the measured results, we successfully verify that the resonant frequency of the external coil improves the phase difference of the IOP sensor.
Lee, Sunghoon,Jeon, Byungjoo,Kang, Taewook,Lee, Wunho,Malik, Afandi Mohammad,Park, Seongwoo,Lim, Jimin,Park, Boowon,Jeong, Yongseok,kim, Jongsu Elsevier 2018 Journal of luminescence Vol.196 No.-
<P><B>Abstract</B></P> <P>Green-emission Zn<SUB>2</SUB>SiO<SUB>4</SUB>:Mn<SUP>2+</SUP> powder phosphor was applied for powder electroluminescence device through a screen printing method. The EL device consisted of silver nanowires as top electrode, 6μm-thick Zn<SUB>2</SUB>SiO<SUB>4</SUB>:Mn<SUP>2+</SUP> phosphor layer, 45µm -thick BaTiO<SUB>3</SUB> dielectric layer, and metal bottom electrode. The EL device showed the strong 525nm green emission spectrum. Its luminance-voltage dependence showed the exponential increase, and its luminance-frequency dependence showed the linear increase and then saturation behavior. It is notable that its temperature dependence showed the constant behavior at lower temperature, and then the drastic rising pattern up to Curie temperature of the dielectric layer (~ 120°C), and then the thermal quenching trend. The maximum luminance was 0.96cd/m<SUP>2</SUP> where the power consumption was 250W/m<SUP>2</SUP> at 420Vp and 400Hz, and thus the luminous efficiency was 0.012lm/W.</P>