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강석진,이유영,고한중,전경문,노태희 한국초등과학교육학회 2004 초등과학교육 Vol.23 No.1
In this study, we investigated the effects of using concept mapping as an instructional tool on 4th graders' achievement, science learning motivation, and attitude toward science classes. T재 classes (38 students) from an elementary school were respectively assigned to a control group and a treatment group. Students were taught about "expansion of matter by heat" and "heat transfer". These topics were chosen because they require students to understand more concepts as well as relationships among them. A science learning motivation test and an attitude toward science classes test were administered as pretests. A researcher-made achievement test, the science learning motivation test, and the attitude toward science classes test were administered as posttests. The results indicated that using concept mapping in 4th-grade science classes was not significantly effective in improving students' achievement though a statistically significant positive effect was found in the subcategory of knowledge. No statistically significant effect of using concept mapping was found in the scores of the science learning motivation test and the attitude toward science classes test. Educational implications are discussed.
밀링기반 마찰교반접합 신기술동향: 공구, 장비 및 응용부품
노중석(Joong-Suk Noh),김주호(Ju-Ho Kim),고건호(Gun-Ho Go),강명창(Myung-Chang Kang) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.6
Friction stir welding (FSW) is a solid state joining technique that has expanded rapidly since its development in 1991 and has numerous applications in a wide variety of industries. This paper introduces the basic principles of friction stir welding (FSW) and presents a survey of the latest technologies and applications in the field. The basic principles that are discussed include the terminology, tool/workpiece processes, FSW merits and process variants. In particular, the process variants including the rotation speed and traveling speed are discussed, which include the defect-free zone in an oxygen free copper and Al alloy, respectively. Multiple aspects of the FSW machine are developed, including a horizontal 2D FSW machine and a hybrid complex FSW machine. The latest applications are introduced, with an emphasis on the recent advances in the aerospace, automotive, and IT display industries. Finally, the direction for future research and potential applications are examined.
Noh, Kap-Soo,Kim, Jong-Wan,Ha, Suk-Hoon,Yoo, Wang-Don,Jeon, Weong-Joong,Kim, Hyun-Su The Korean Society for Biotechnology and Bioengine 1999 Biotechnology and Bioprocess Engineering Vol.4 No.1
Although many pharmaceutically useful proteins are produced in E. coli expression system, it is very are rare for the system to be used in the production of diagnostic antigen due to a major problem, i.e., false-positive reaction of e. coli host-derived proteins contaminating purified diagnostic antigen with human sera. The N (nucleocapsid) protein of Seoul virus causing haemorrhagic fever with renal syndrome (HFRS) was produced in E. coli BL21 (DE3), and used for the detection of N protein-specific antibodies in human sera. Using the N protein as a diagnostic antigen of HFRS, the false-positive reaction was cleared by merely mixing the test sera with the extract of E. coli host strain not harboring expression plasmid.
A Modified SLM Scheme With Low Complexity for PAPR Reduction of OFDM Systems
Seok-Joong Heo,Hyung-Suk Noh,Jong-Seon No,Dong-Joon Shin IEEE 2007 IEEE transactions on broadcasting Vol.53 No.4
<P>In this paper, we propose a new peak-to-average power ratio (PAPR) reduction scheme of orthogonal frequency division multiplexing (OFDM) system, called a modified selected mapping (SLM) scheme, which considerably reduces the computational complexity with keeping the similar PAPR reduction performance compared with the conventional SLM scheme. The proposed scheme is analytically and numerically evaluated for the OFDM system specified in the IEEE 802.16 standard. For the OFDM system with 2048 subcarriers, the proposed scheme with 4 binary phase sequences can reduce the complex multiplications by 63.5% with the similar PAPR reduction compared with the SLM scheme with 16 binary phase sequences.</P>
직교 주파수 분할 다중화 시스템에서 최대전력 대 평균전력의 비를 줄이기 위한 연산량이 적은 새로운 선택사상 기법
허석중(Seok-Joong Heo),노형석(Hyung-Suk Noh),노종선(Jong-Seon No),신동준(Dong-Joon Shin) 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.11C
본 논문에서는 직교 분할 주파수 다중화 (이하 OFDM) 시스템에서 최대전력 대 평균전력의 비 (이하 PAPR)를 줄일 수 있는 새로운 선택사상기법 (selected mapping; 이하 SLM) 방법에 대해서 제안한다. 제안된 방법의 PAPR 감소 성능은 기존의 SLM과 동일하게 유지하면서도 연산 복잡도는 크게 감소시킨다. 또한, 본 논문에서는 모의실험을 통하여 IEEE 802.16에 제안된 표준에 근거한 OFDM 시스템을 수식적이고 해석적으로 분석하였다. 2048개의 부반송파를 사용하는 시스템에서 본 논문에서 제안하는 방법을 이용하여 4개의 서로 다른 위상 시퀀스를 생성하여 (U=4) PAPR 감소에 이용하는 경우 기존의 SLM에서 16개의 서로 다른 위상 시퀀스를 이용하여 (U=16) PAPR을 줄이는 경우와 비슷한 PAPR 감소 성능을 가지면서도 연산복잡도는 63.5% 감소되었다. In this paper, we propose a new peak-to-average power ratio (PAPR) reduction scheme of orthogonal frequency division multiplexing (OFDM) system, called a modified selected mapping (SLM) scheme, which considerably reduces the computational complexity with keeping the similar PAPR reduction performance compared with the conventional SLM scheme. The proposed scheme is analytically and numerically evaluated for the OFDM system specified in the IEEE 802.16 standard. For the OFDM system with 2048 subcarriers, the proposed scheme with 4 binary phase sequences can reduce the complex multiplications by 63.5% with the similar PAPR reduction compared with the SLM scheme with 16 binary phase sequences.
초등학교 과학 수업에 적용한 협동학습 전략에서 보상구조의 효과
고한중(Han Joong Koh),홍선희(Sun Hee Hong),강석진(Suk Jin Kang),노태희(Tae Hee Noh) 한국초등과학교육학회 2002 초등과학교육 Vol.21 No.1
Although the reward based on group accomplishment in cooperative learning has a merit to emphasize interdependency, it may have some undesirable side effects such as free rider effect and sucker effect. For the purpose of reducing these side effects, this study examined how the adjustment of the reward structure affected the scholastic achievement, the perception of learning environments, and the attitude toward science class by adding individual reward to group reward. We selected 2 classes of sixth grade in an elementary school, and taught on oxygen and carbon dioxide for 13 class hours in cooperative learning strategies. Group reward was applied to one class, and both group and individual rewards were applied to the other class. Analysis of the results indicated that the achievement scores of the students under the group and individual rewards were significantly higher than those under the group reward. In addition, they had more difficulty in science class and felt less satisfied. The upper level students under the group and individual rewards were also found to exhibit more competition. Educational implications were discussed.