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차량하중에 의한 도로교의 동적응답특성에 대한 하부구조의 영향
김상효 ( Kim¸ Sang-hyo ),허진영 ( Huh¸ Jin-young ),이훈희 ( Lee¸ Hun-hee ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
The purpose of this study is to evaluate the dynamic behavior of highway bridge due to moving vehicle load, considering the effect of pier types and soil conditions. To analyze the effects of pier types and soil conditions on the dynamic behavior of bridge, the pier and foundation modeled with 3 dimensional frame elements, and ground idealized as lumped-parameter-system, are included in the bridge analysis model. Dynamic behavior of a bridge due to vehicular load is examined using 3 dimensional bridge and vehicle models. A simple plate girder bridge with a span length of 40m is modeled as a 3 dimensional truck having 9 independent degrees of freedom. Characteristics of the dynamic response of the bridge including changes in dynamic amplification factors due to vehicular loading are studied. The dynamic responses obtained from the analytical bridge model with T-type pier are found to be more significant than that of the bridge model with TT-type pier, which is mainly due to the smaller torsional stiffness of the bridge having T-type pier. Also larger dynamic responses are obtained when the soil condition is considered.
Small Electrical Nerve Stimulator by Arm Processor
Sanghyo Woo,Changwook Kim,Mohyuddin Zia,Sangheon Lee,Euisung Chung,Jangwoo Lee,Junghyun Lee,Heejoon Park,Chulho Won,Jinho Cho 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Recently, performance of a mobile phone has increased dramatically, and it is possible to integrate various biotechnologies into the mobile phone. Among the various biotechnologies, a transcutaneous electrical nerve stimulator has many advantages such as improve the circulation of blood and suppress a pain. To integrate the stimulator in the mobile phone, it is necessity to make small, low power, and safe module. In this paper, the transcutaneous electrical nerve stimulation module was designed and implemented by small boost converter. To reduce the power consumption, the external ADC was used to measure the value of the charged energy. Also, the module limits the maximum transmit power by tank capacitor value to inprove safety. To confirm the operation of designed module, an arm processor was used to control the module. The implemented module consumes only 6.6 ㎽ (without CPU) at normal stimulus mode.
Performance of Double GEM and Triple GEM
Sanghyo Han,Do-Hyung Kim,Heedong Kang,Hyosung Cho,Jang-Min Han,Kyoungkeun Jeong,Sangmook Kang,Tae-Hoon Lee,Yongkyun Kim,Yong-Sub Cho,Young-Jun Kim 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.5
The operation of a double GEM and a triple gas electron multiplier (GEM) was examined in several gas mixtures, including Ar/Isobutane, Ar/CO2, and Ar/N2. In the double GEM and the triple GEM detectors, large gains of about 5 104 and 6 105, respectively, were obtained for the Ar/Isobutane mixture. The optimum value of the transfer eld and the dependence of the collection current on the drift, transfer, and collection field strengths for the GEM voltage sharing in the double GEM are discussed. A lower operation voltage and gain limit are also reported for the case of a triple GEM.
Sanghyo Park,Wonhoon Lee 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10
The tribe Tropidocephalini Muir, 1915 (Delphacidae: Delphacinae) comprised 37 genera 204 species worldwide. In Korea, only three species, Epeurysa nawaii Matsumura, 1900, Tropidocephala brunnipennis (Distant, 1906), T. nigra (Matsumura, 1900), have been reported. In this study, one species, Epeurysa distincta Huang & Ding, 1979, is reported for the first time from Korea. We provide the morphological characteristics, photographs and taxonomic keys of the four species belonging to the tribe Tropidocephalini.
Lee, Sanghyo,Ko, Wonbae,Oh, Yujin,Lee, Jongsun,Baek, Gwangho,Lee, Younhee,Sohn, Junginn,Cha, Seungnam,Kim, Jongmin,Park, Jeagun,Hong, Jinpyo Elsevier 2015 Nano energy Vol.12 No.-
<P><B>Abstract</B></P> <P>Wearable energy harvesting devices are of increasing importance for the realization of flexible smart electronics, as the basic building blocks of power sources are able to convert the mechanical energy induced from body movement to electricity. Here, we report the electrical responses of a textile substrate-based triboelectric nanogenerator (T-TENG), including nanostructured surface configurations provided by Al nanoparticles and PDMS, in which no intricate fabrication process was performed or required. Along with analysis of the working principle and finite element simulation, the textile-based output power density of 33.6mW/cm<SUP>2</SUP> was obtained from the periodic mechanical stress of an adjustable bending machine, and this was used to activate commercially available light emitting diode (LED) bulbs. Additionally, we demonstrated the generation of sufficient energy from clothes attached to a commercial arm sleeve to power the LED devices from the activity of a human arm. Our practical cloth approach may contribute to a general framework for developing functional and self-powered wearable electronic devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Textle substrate was used to develope functional self-powered energy harvester. </LI> <LI> Electrical features of T-TENG was manipulated by various surface configurations. </LI> <LI> A self-powered clothes was demonstrated as one example of energy harvester. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Textile substrate-based triboelectric nanogenerator (T-TENG) including nanostructured surface configurations provided by Al nanoparticles and PDMS has been demonstrated for the generation of energy from clothes attached to a commercial arm sleeve in order to power the LED devices from the activity of a human arm.</P> <P>[DISPLAY OMISSION]</P>