• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.414-420
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• 2005

The ShortStack Micro Server enables any product that contains a microcontroller or microprocessor to quickly and inexpensively become a networked, Internet-accessible device. The ShortStack Micro Server provides a simple way to add LonWorks networking to new or existing smart devices. . It implements the LonTalk protocol and provides the physical interface with the LonWorks communication. The ShortStack host processor can be an 8, 16, or 32-bit microprocessor or microcontrollers. The ShortStack API and driver typically require about 4kbytes of program memory on the host processor and less than 200 bytes of RAM. The interface between host processor and the ShortStack Micro Server may be a Serial Communication Interface (SCI). The LonWorks control module with a high performance is developed, which is composed of the 8 bit PIC Microprocessor for host processor and the smart neuron chip for the ShortStack Micro Server. This intelligent control board is verified as proceeding the various function tests from experimental system with an boost pump and inverter driving systems. It is also confirmed that the developed control module provides stably 0-10VDC linear signal to the input signal of inverter driving system for varying the induction motor speed. Thus, the experimental results show that the fabricating intelligent board carried out very well the various functions in the wide operating ranges of boost pump system. This developed control module expect to apply to industrial fields to require the comparatively exact control and monitoring such as multi-motor driving system with inverter, variable air volume system and the boost pump water supply systems.

• 전자공학회논문지 IE
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• 제44권4호
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• pp.1-10
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• 2007

본 논문에서는 송수화기를 사용하지 않고도 통화 가능한 핸즈프리 통화방식에서 스피커의 출력신호가 마이크로 입력되는 음향반향(acoustic echo)을 효과적으로 제거할 수 있는 음향반향 제거기가 적용된 핸즈프리 전화기의 구현에 관하여 연구한다. 적응필터만을 적용한 기존의 음향반향 제거기는 반향신호와 동시통화의 문제를 동시에 해결하는데 있어서 많은 어려움을 갖고 있다. 이를 해결하기 위해서 본 논문에서는 modified NLMS 알고리즘이 적용된 적응필터, 두 개의 독립된 망각인자(forgetting factor)를 이용하여 원단신호의 음성구간을 정확하게 검출하는 VAD, 마이크신호와 잔여반향신호의 상호상관계수를 이용하여 동시통화 구간을 신속하고 정확하게 판단하기 위한 동시통화 검출기, 그리고 VAD와 동시통화 검출기를 이용한 출력제어부로 구성된 음향반향 제거기를 제안한다. 이러한 구조의 음향반향 제거기가 적용된 핸즈프리 전화기는 기존의 핸즈프리 전화기와 차별되게 반향도 없고 동시통화도 원활한 성능을 보여준다.

• Bulletin of the Korean Chemical Society
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• 제35권11호
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• pp.3175-3180
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• 2014

A potentiometric sensor based on the 1-benzyl-3-(4-nitrophenyl) thio-urea was synthesized and tested as an ionophore in PVC based membrane sensor towards $SCN^-$ ions. This membrane exhibits a linear stable response over a wide concentration range ($1.0{\times}10^{-5}$ to $1.0{\times}10^{-2}M$) with a slope of -59.2 mV/dec., a detection limit of ${\log}[SCN^-]=-5.05$, and a selectivity coefficient for thiocyanate against perchlorate anion of ${\log}K^{pot}_{SCN^-j}=-0.133$. The selectivity series of the membrane is as follows: $SCN^-$ > $ClO_4{^-}$ > $I^-$ > $NO_3{^-}$ > $HSO_3{^-}$ > $Cl^-$ > $HSO_4{^-}$ > $F^-$ > $CH_3COO^-$ > $HCO_3{^-}$ > $Br^-$ > $H_2PO_4{^-}$ > $SO{_3}^{2-}$ > $SO{_4}^{2-}$ > $CO{_3}^{2-}$. The proposed electrode showed good selectivity and a good response for the $SCN^-$ ion over a wide variety of other anions in pH 6.0 buffer solutions and has a fast response time of about < 5s. The influences of the membrane by pH, ionophore, and plasticizer were studied.

• 한국세라믹학회지
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• 제44권12호
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• pp.655-659
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• 2007

Zirconia polycrystals co-doped with x mol% CaO and (10-x) mol% $Y_2O_3$ were prepared by solid state reaction method. The compositions were chosen for nominally the same oxygen vacancy concentration of 5 mol%. X-ray diffraction patterns indicated the formation of cubic zirconia by heat treatment at $1600^{\circ}C$. Impedance spectroscopy was applied to deconvolute the bulk and grain boundary response. Electrical conductivity was measured using the complex impedance technique from 516 to 874 K in air. Maximum conductivity was exhibited by the composition with equal amounts of CaO and $Y_2O_3$, which may be ascribed to the smaller degree of defect-interactions in that composition due to the competition of different ordering schemes between the two systems. When compared to the composition containing $Y_2O_3$ only, co-doping of CaO increases the grain boundary resistance considerably. The activation energy of grain and grain boundary conductivity was 1.1 eV and 1.2 eV, respectively, with no appreciable dependence on dopant compositions.

• 대한치과교정학회지
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• 제47권4호
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• pp.238-247
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• 2017

Objective: The aim of this study was to compare recycled and unused orthodontic miniscrews to determine the feasibility of reuse. The comparisons included both miniscrews with machined surfaces (MS), and those with etched surfaces (ES). Methods: Retrieved MS and ES were further divided into three subgroups according to the assigned recycling procedure: group A, air-water spray; group B, mechanical cleaning; and group C, mechanical and chemical cleaning. Unused screws were used as controls. Scanning electron microscopy, energy-dispersive X-ray spectrometry, insertion time and maximum insertion torque measurements in artificial bone, and biological responses in the form of periotest values (PTV), bone-implant contact ratio (BIC), and bone volume ratio (BV) were assessed. Results: Morphological changes after recycling mainly occurred at the screw tip, and the cortical bone penetration success rate of recycled screws was lower than that of unused screws. Retrieved ES needed more thorough cleaning than retrieved MS to produce a surface composition similar to that of unused screws. There were no significant differences in PTV or BIC between recycled and unused screws, while the BV of the former was significantly lower than that of the latter (p < 0.05). Conclusions: These results indicate that reuse of recycled orthodontic miniscrews may not be feasible from the biomechanical aspect.

• 전자공학회논문지 IE
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• 제46권1호
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• pp.7-15
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• 2009

본 논문에서는 지상라이다를 이용한 구조물의 자동 윤곽선 추출을 다룬다. 본 논문에서는 사진을 이용하지 않고 전처리를 하지 않은 데이터를 직접 이용하여 구조물의 정면 윤곽선을 추출하는 것을 제안한다. 또한, 구조물의 크기와 데이터 수 즉, 라이다로 측정한 포인트 수를 고려한 효율적인 데시메이션 방법을 제안하였다. 이렇게 데시메이션된 데이터에서 라이다 데이터의 주요 특성중 하나인 거리정보를 이용하여, 구조물과 구조물이 아닌 점으로 구별해낸다. 그 후, 분산을 이용해 지역적으로 절대 좌표값이 큰 값과 작은 값을 찾아내고, 이를 윤곽선 후보 점으로 한다. 이렇게 찾아낸 구조물 윤곽선의 후보점들을 이어 윤곽선으로 만들고 최종적으로 정리하여 좀 더 현실에 가까운 윤곽선을 자동으로 추출하는 방법을 제안한다.

• 한국초등과학교육학회지:초등과학교육
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• 제33권4호
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• pp.762-772
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• 2014

The purpose of this study was to investigate the effects of science lesson applying STEAM education on the creative thinking activities and emotional intelligence of elementary school students. The study subjects were two classes of the $3^{th}$ grade of S elementary school in B Metropolitan City. One class including 26 students was experimental group and the other including 27 students was comparison group. For the purpose of study, the lesson unit 'The world of animals' was practised, the reorganized unit applying STEAM was applied to experimental group, whereas comparison group was taught traditional science lesson. The results of this study were as follows. First, the science lesson applying STEAM education influenced significantly the improvement of the creative thought activities of elementary school students. Second, the science lesson applying STEAM education influenced significantly the improvement of the emotional intelligence of elementary school students.

• 한국의학물리학회지:의학물리
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• 제20권3호
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• pp.167-173
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• 2009

최신 방사선치료 기법의 도입에 따라 복잡한 치료 기법의 기록 및 관리를 위해 방사선종양학과 전용의 전자의무기록의 필요성이 증대하고 있는 현실이다. 그러나 방사선종양학과의 전자의무기록에서 환자의 치료계획 정보 및 치료일정 관리등을 구현하여 종이의무기록을 대체하기에는 많은 어려움이 있어 국내의 방사선종양학과에서는 전자의무기록 활용이 저조한 현실이다. 본 연구에서 방사선종양학과의 전자의무기록 적극적인 활용을 위해 국내 방사선종양학과에서 구축한 방사선종양학과의 전자의무기록을 소개하고자 한다.

• Journal of Plant Biotechnology
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• 제36권1호
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• pp.53-58
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• 2009

Calcium signals can be transduced by binding calmodulin (CaM), a $Ca^{2+}$ sensor in eukaryotes, is known to be involved in the regulation of diverse cellular functions. We isolated a CaM-binding protein 63 kD (AtCBP63) from the pathogen-treated Arabidopsis cDNA expression library. Recently, AtCBP63 was identified as a CaM bining protein. The CaM binding domain of AtCBP63 was reported to be located in its N-terminal region, In this study, however, we showed that ACaM2 could specifically bind to second CaM-binding domain (CaMBD) of AtCBP63 at the C-terminal region. The specific binding of CaM to CaM binding domain was confirmed by a gel mobility shift assay, a split ubiquitin assay, site-directed mutagenesis, and a competition assay using a $Ca^{2+}$/CaM-dependent enzyme. The gene expression of AtCBP63 was induced by pathogens and pathogens related second messengers. This result suggests that a CaM binding protein, AtCBP63, may play role in pathogen defense signaling pathway.

• 대한기계학회논문집A
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• 제24권3호
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• pp.613-624
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• 2000

In this study, new design method of prosthetic foot was suggested which can evaluate the performance of prosthetic foot by implementing amputee's gait simulation using the finite element analysis. The basic shape of ESPF(Energy Storing Prosthetic Foot) was designed which is suitable for the below-knee amputee considering mechanical properties and kinematic properties. And, the performance evaluations were performed using the Taguchi method with orthogonal array L25. As a result, average main effect of factors for the ESPF's performance were calculated and then optimum condition of given shape was selected. Essential particulars for the performance evaluation from the simulation result were the quantity of external work needed in stance phase, the quantity of transferred energy from the ESPF through the knee, and the vertical displacement of knee at toe-off. Reasonable optimum condition was obtained from the using performance index. From this study, it was found that it is necessary for the design of ESPF to consider the geometrical data related to the magnitude of load on elastic material.