http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
디지털자료 중심의 접근 가능한 교육자료(AEM) 제작 및 활용 방안에 대한 탐색: 미국 AEM 센터를 중심으로
강성구 ( Kang Seong-goo ),강종구 ( Kang Jong-gu ) 한국지적장애교육학회(구 한국정신지체아교육학회) 2020 지적장애연구 Vol.22 No.1
본 연구는 장애학생에게 ‘접근 가능한 교육자료(AEM: Accessible Educational Materials)’를 제공할 수 있는 방안으로서 교과서, 교수자료, 평가지와 같은 교육매체들이 어떻게 디지털 형태로 전환될 수 있는지를 탐구하기 위한 것이다. 이를 위해 기존 교육자료 제작과정의 현실을 알아보고, 미국 AEM 센터를 중심으로 국내 상황에 적용 가능한 교육자료 제작 표준 및 활용 방안을 파악하고자 하였다. 본 연구의 결과는 다음과 같다. 첫째, 미국 AEM 센터에서 제공하는 디지털자료 중심의 AEM 제작 및 활용 방안은 국내 교육자료의 접근성을 크게 향상시킬 수 있는 효과적인 방안이었다. 둘째, 국내 일부 디지털자료는 현재의 교육환경에서 즉각적으로 사용될 수 있지만, 대부분의 경우 제작 규격 및 절차의 표준화 미비, MathML 적용에서의 어려움과 같은 기술적 어려움이 있었다. 본 연구는 디지털자료 활용을 위해 다음과 같은 제안을 하고자 한다. 첫째, AEM 지원은 시각장애학생을 포함하여 다양한 장애 유형의 학생들로 확대될 필요가 있다. 둘째, 현행 대체자료 위주의 AEM 제작 및 배포 시스템에 대한 전면적인 재검토가 필요하다. 셋째, AEM의 제작 및 배포는 국가 차원에서 이루어질 필요가 있다. The purpose of this study was to explore how digital forms of educational materials such as textbooks, instructional materials and evaluation papers could be transformed as a way to provide ‘accessible educational materials(AEM)’ for students with disabilities. For the purpose of this study, we identified the production reality on existing educational materials and attempted to figure out the production standards and utilization methods on educational materials that could be applied in domestic situation focused on AEM center in the U.S. The results of this study were as follows. First, digital-based AEM production and utilization methods provided from AEM center in the U.S. were an effective way that could greatly increase the accessibility of domestic educational materials. Second, some of domestic digital materials could be immediately used in the current educational environments, but most of them possessed technical difficulties such as the deficiency of production standard and procedure and the difficulty in the application of MathML. This study attempted to suggest for the utilization of digital materials such as the following: First, AEM support needs to expand towards students with various types of disabilities including students with visual impairments. Second, the AEM production and distribution system based on the current alternative materials needs to comprehensive reexamination. Third, the production and distribution of AEM need to be conducted in national level.
천연 Brucite의 물성분석 및 이산화황 흡수제로의 응용
강성구(Seong-Gu Kang),김명환(Myoung-Hwan Kim),김진배(Jin-Bae Kim) 한국청정기술학회 2009 청정기술 Vol.15 No.4
중국 Liaoning에서 산출된 천연 brucite를 원료로 Mg(OH)2 slurry를 제조하고, 그 탈황 성능을 magnesite를 원료로 열분해 및 수화반응으로 제조된 Mg(OH)2 slurry와 비교하였다. Brucite와 magnesite를 원료로 제조된 Mg(OH)2 분말의 물리/화학적 특성은 유사했지만, brucite를 원료로 제조된 Mg(OH)₂ 결정입자의 판상구조가 보다 안정적으로 발달되어 있었다. Brucite와 magnesite를 원료로 제조된 Mg(OH)₂ slurry의 탈황효율은 brucite가 조금 높았다. Brucite를 배연탈황용 흡수제로 충분히 적용할 수 있을 것으로 기대된다. Mg(OH)₂ slurry was prepared by using natural mineral brucite mined in Liaoning province in China, and its de-SOx efficiency was compared with that of Mg(OH)₂ slurry prepared by thermal decomposition and hydration of magnesite. The physical and chemical characteristics of Mg(OH)₂ powders prepared from brucite and magnesite were similar. However, the layered plate structure of Mg(OH)₂ crystal particles prepared from brucite had grown more stably. The desulfurization efficiency of Mg(OH)₂ slurry prepared from brucite was slightly higher than that of magnesite. Brucite may be used as a new absorbent for the desulfuriztion of flue gas in the future.
솔-젤법에 의해 제조된 실리콘 태양전지 전극형성용 나노 글래스
강성구(Seong Gu Kang),이창완(Chang Wan Lee),정윤장(Yoon Jang Chung),김창균(Chang-Gyoun Kim),김성탁(Seongtak Kim),김동환(Donghwan Kim),이영국(Young Kuk Lee) 한국태양광발전학회 2014 Current Photovoltaic Research Vol.2 No.4
We have investigated the seed layer formation of front side contact using the inkjet printing process. Conductive silver ink was printed on textured Si wafers with 80 nm thick SiNx anti reflection coating (ARC) layers and thickened by light induced plating (LIP). The inkjet printable sliver inks were specifically formulated for inkjet printing on these substrates. Also, a novel method to prepare nano-sized glass frits by the sol-gel process with particle sizes around 5 nm is presented. Furthermore, dispersion stability of the formulated ink was measured using a Turbiscan. By implementing these glass frits, it was found that a continuous and uniform seed layer with a line width of 40㎛ could be formed by a inkjet printing process. We also investigated the contact resistance between the front contact and emitter using the transfer length model (TLM). On an emitter with the sheet resistance of 60 Ω/sq, a specific contact resistance (pc) below 10 mΩ · cm² could be achieved at a peak firing temperature around 700 °C. In addition, the correlation between the contact resistance and interface microstructures were studied using scanning electron microscopy (SEM). We found that the added glass particles act as a very effective fire through agent, and Ag crystallites are formed along the interface glass layer.
적분형 LQR 설계 기법을 이용한 능동자기베어링의 오버슈트 방지용 입력필터에 관한 연구
강성구(Seong-gu Kang),이기석(Kee-seok Lee),홍준희(Jun-hee Hong),정준모(Jun-mo Chung),신우철(Woo-cheol Shin) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.2
Active magnetic bearing has been adopted to support the rotor by electomagnetic force without mechanical contact and lubrication process. A property of the control system for magnetic bearing is improved in accordance with making higher system gain. If the control system has integral part, an excessive overshoot response is shown by making higher integral gain. Therefore, this paper suggests a PID control system in order to eliminate the overshoot at the first stage and improve response characteristics to an impact disturbance at the status of levitation. The control gain was obtained by LQR design method which has the structure of I-PD control system in the state space. The PID control system containing prefilter has the same structure as the I-PD control system. Therefore, the PID control system adopted is able to be tuned by LQR design method. Finally, this paper shows the effect of the prefilter on the active magnetic bearing system through response experiments for levitation responses.
동시증착법에 의해 성장된 붕화마그네슘 박막의 증착속도에 따른 효과
박성창,강성구,정대길,정준기,임영진,김찬중,김철진,Park, Sung-Chang,Kang, Seong-Gu,Jeong, Dae-Gil,Chung, Jun-Ki,Lim, Yeong-Jin,Kim, Chan-Joong,Kim, Cheol-Jin 한국초전도학회 2008 Progress in superconductivity Vol.10 No.1
Magnesium diboride ($MgB_2$) is an inexpensive and simple superconductor. This material was first synthesized and its structure confirmed in 1953 but its superconducting properties were not discovered until 2001 when they caused great excitement. In this study, superconducting $MgB_2$ thin films on the r-$Al_{2}O_3$ substrates have been grown by the combination of radio frequency magnetron sputtering of B and thermal evaporation of Mg. The deposition conditions were varied by changing deposition rate. Before the co-deposition of Mg and B, the deposition rates of each element have been measured separately. The $MgB_2$ layers had 400nm in thickness and superconducting transition temperatures have been measured around $\sim$38.6K. Superconducting properties have been measured by PPMS, XRD, and SEM.
폐(廢) ITO 타겟으로부터 분무열분해(噴霧熱分解) 공정(工程)에 의한 ITO 나노 분말(粉末) 제조(製造)
유재근,강성구,손진군,Yu, Jae-Keun,Kang, Seong-Gu,Sohn, Jin-Gun 한국자원리싸이클링학회 2007 資源 리싸이클링 Vol.16 No.1
Nano-sized ITO powders with the average particle size below 50 nm were synthesized from complex acid solution dissolved the ITO target into hydrochloric acid by a spray pyrolysis process, and the influences of reaction factors as reaction temperature and concentration of raw material solution were investigated. As the reaction temperature increases from 800 to $1000^{\circ}C$, the average particle size of the ITO powder increases from 40 nm to 100 nm, the microstructure gradually becomes solid, individual particles independently appear with the shape of polygon, the particle size distribution becomes increasingly irregular, the XRD peak intensity gradually increases and the specific surface area decreases. As the concentration of the raw material solution increases from 50g/l to 400g/l, the average particle size of ITO powder gradually increases, yet the particle size distribution appears more irregular. When the concentration is at 50 g/l, the average particle size of ITO powder is below 30 nm and the particle size distribution appears comparatively uniform. Nevertheless, when the concentration reaches 400 g/l, which is close to e saturated concentration, the particle size distribution appears extremely irregular, and the particles with the size ranging from 20 nm to 100 nm coexist. Along with the concentration rise, the XRD peak intensity gradually increases, yet the specific surface area decreases. 폐 ITO 타겟을 염산에 용해시킨 복합 산용액을 원료로 하여 자체기술에 의해 개발한 분무열분해 반응장치를 통하여 평균입도가 50nm이하인 나노 ITO 분말을 제조하였으며, 반응온도 및 원료용액의 농도 등의 반응인자들의 변화에 따른 ITO 분말의 특성을 파악하였다. 반응온도가 $800^{\circ}C$로부터 $1100^{\circ}C$로 변화함에 따라 생성된 ITO 분말의 평균 입도는 40nm로부터 100nm정도까지 증가하고 있었으며, 조직도 점점 치밀화되면서 각각의 입자들이 독립된 다각형 형태를 나타내었으며, 입도분포는 더욱 불균일하게 나타나고 있었다. 또한 반응온도 증가에 따라 XRD 피크의 강도는 증가하였으며 비표면적은 감소하고 있었다. 원료용액 내의 인듐 성분의 농도가 50g/l로부터 400g/l로 증가됨에 따라 생성된 ITO 분말의 평균입도는 점점 증가하는 반면 입도분포는 더욱 불균일 하였다. 농도가 50g/l인 경우에는 ITO 분말의 평균입도는 30nm 이하이면서 입도분포는 비교적 균일하게 나타나고 있었다. 반면 농도가 포화농도에 가까운 400g/l인 경우에는 분말들의 입도분포는 20nm 정도부터 100nm 이상까지 공존하는 매우 불균일한 형태를 나타내고 있었다. 농도가 증가함에 따라 XRD 피크의 강도는 점점 증가하였으며 비표면적은 점점 감소하였다.