http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
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.
일반학교 장애학생 지원을 위한 특수학급 유형의 재구조화
강종구 ( Kang Jong-gu ),강성구 ( Kang Seong-goo ) 한국특수아동학회 2021 특수아동교육연구 Vol.23 No.1
연구목적: 본 연구는 일반학교에 배치되어 있는 장애학생에게 장애 유형에 상관없이 특수교육을 제공할 수 있는 특수학급 모형을 제안하기 위한 것이다. 연구방법: 이를 위해 경도장애, 중도 장애, 신체장애 학생에게 제공될 수 있는 특수교육의 기준과 특수학급 유형을 탐색하였다. 연구결과: 본 연구의 결과는 다음과 같다. 첫째, 특수교육 기준과 관련하여 장애학생의 참여시간, 장애 유형과 정도로 구분하여 접근할 필요가 있음을 제시하였다. 둘째, 특수학급 유형은 학생의 특성, 학급 형태, 지원의 유형을 고려하여 통합형 특수학급, 집중형 특수학급, 독립형 특수학급과 같은 3가지 유형으로 구분해서 제공될 필요가 있음을 제시하였다. 결론: 결론적으로 늘어나는 특수교육적 요구에 현실적으로 대응하기 위해서는 단순화되어 있는 특수학급 형태를 보다 전문화하고 다양화할 필요가 있고, 특수학급의 운영 형태를 세분화함에 따라 다양한 특수교육적 요구에 대한 정책적 자원의 균형적인 배분과 특수교사의 전문화를 통한 업무 경감을 도모할 수 있다. 다만 일반학교 내 독립형 특수학급의 설치는 소규모 특수학교 설립과 함께 충분한 논의 속에서 다루어져야 할 것이며 향후 포함식 통합교육 실행에 따른 변화도 함께 고려되어야 할 것이다. Purpose: This study is to propose various special classroom models that can be made for students with disabilities. Method: The study tried to present special classroom models that can provide more integrated special education to students with various disabilities rather than a special classroom system centered on students with cognitive difficulties in South Korea. The study tried to deal with it by dividing it into special education service standards and special classroom types. Results: First, it was suggested that the standard for special education de needed to be approached by dividing the participation time of special education target students, the ratio of teachers to students, and the types of disability. Second, it was suggested that special classroom types need to be categorized into three types: integrated special classroom, intensive special classroom, and self-contained classroom according to the characteristics of students, classroom type, and type of application. Conclusion: In conclusion, in order to realistically respond to the increasing demands of special education, it is necessary to further specialize and diversify the simplified special classroom types, and as the operation of special classroom is subdivided, a balanced allocation of policy resources for various special education needs and special work reduction can be achieved through teacher specialization. However, the value of self-contained classroom in general schools should be dealt with in sufficient discussion along with the establishment of small special schools, and changes due to the implementation of inclusive education in the future should also be considered.