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271.

보청기적합공식과 한국의 연구 고찰

이경원, 김진숙 한국청각언어재활학회 Audiology and Speech Research 7 Pages

한국청각언어재활학회 Audiology and Speech Research 2009, 제 5권 제 1호 2 6-12 (7 pages)

이경원, 김진숙 저
...
- 3,000원
청력 및 역동범위(dynamic range)의 개선, 어음청취력의 향상 등을 위해서는 청력손실의 종류, 정도 및 형태에 적절한 보청기의 이득(gain) 또는 주파수반응곡선(frequency response curve), 최대출력(saturation sound pressure level 90, SSPL90 또는 output sound pressure level 90, OSPL90), 압축역치(compression threshold, CT) 및 압축비율(compression ratio, CR) 등의 산출이 필요하다. 이를 위해서 영어 또는 이와 비슷한 언어를 사용하는 미국, 유럽 호주 등은 보청기처방법(hearing aid prescription method) 또는...
272.

비프로그램식 보청기에서 압축역치의 조절을 통한 배경소음의 감소에 대한 사례보고

이상연 한국청각언어재활학회 Audiology and Speech Research 5 Pages

한국청각언어재활학회 Audiology and Speech Research 2008, 제 4권 제 2호 10 199-203 (5 pages)

이상연 저
...
- 1,500원
프로그램식(programmable)의 디지털보청기는 광대역압축(wide dynamic range compression, WDRC)에 의한 감각신경성 난청인의 좁은 역동범위 (dynamic range)의 정상화, 소음(noise) 및 음향피드백 (acoustic feedback)의 효과적인 탐지 및 제어 기술을 통한 신호대잡음비 및 어음분별력의 개선 등에 있어서 효과적이다.4)7) 그러나 현재 일부 보청기 제조사에서 출시하고 있는 보청기는 신호의 처리는 디지털이지만 2~4개의 조절기(trimmer)를 부착한 비프로그램식(non-programmable)의 조절방식을 채택하고 있다. 비프로그램식의 디지털...
273.

수학학습장애 위험학생과 일반학생의 규칙장모형을 적용한 수학문장제 문제해결 인지요소 숙달비율 및 성취비율 비교

고혜정, 김동일 한국학습장애학회 학습장애연구 28 Pages

한국학습장애학회 학습장애연구 2014, Vol.11 No.1 6 119-146 (28 pages)

고혜정, 김동일 저
...
- 5,700원
본 연구에서는 일반학생들과 수학학습장애 위험학생들의 수학문장제 문제해결관련 인지요 소의 숙달정도와 성취확률을 비교해봄으로써 수학학습장애 위험학생이 가지고 있는 어려움 이 무엇인지 파악하고자 하였다. 이를 위해 수학문장제 문제해결과정을 반영하여 Q-matrix를 제작하고 타당도를 확인한 후, 문장제 문제를 개발하여 이를 초등학교 4학년에 재학 중인 학생 977명을 대상으로 검사를 실시하였다. 이를 규칙장모형을 적용하여 분석한 결과, 수학 학습장애 위험학생들의 인지요소 숙달비율과 성취확률이 일반학생들보다 낮게...
274.

Japan's GIGA School Initiative: Environmental Change and Its Educational Use

장지은(Jang Ji-eun), 박주언(Park Ju-eon), 마츠오유미(Matsuo Yu-mi), 송미란(Song Mi-ran) 한국교육학회 교육학연구 25 Pages

한국교육학회 교육학연구 2022, 60권 7호 4 63-87 (25 pages)

장지은(Jang Ji-eun), 박주언(Park Ju-eon), 마츠오유미(Matsuo Yu-mi), 송미란(Song Mi-ran) 저
...
- 5,400원
This study analyzes the characteristics of Japan's Global Innovation Gateway for All (GIGA) school initiative, which promoted various educational outcomes through environmental changes that improved schools’ information and communications technology (ICT) during the COVID-19 period. For this purpose, this literature review examines the theoretical understanding of the educational environment, the policy background of the GIGA school initiative, its main educational values, and the policy in...
275.

Study on properties of eco-friendly reduction agents for the reduced graphene oxide method

Young-il Na, Young Il Song, Sun Woo Kim, Su-Jeong Suh 한국탄소학회 Carbon Letters 9 Pages

한국탄소학회 Carbon Letters 2017, Vol.24 1 1-9 (9 pages)

Young-il Na, Young Il Song, Sun Woo Kim, Su-Jeong Suh 저
...
- 3,000원
We studied the basic properties and fabrication of reduced graphene oxide (rGO) prepared using eco-friendly reduction agents in the graphene solution process. Hydrazine is generally used to reduce graphene oxide (GO), which results in polluting emissions as well as fixed nitrogen functional groups on different defects in the graphene sheets. To replace hydrazine, we developed eco-friendly reduction agents with similar or better reducing properties, and selected of them for further analysis. In...
276.

Dispersions of partially reduced graphene oxide in various organic solvents and polymers

Hye Min Kim, Seo Gyun Kim, Heon Sang Lee 한국탄소학회 Carbon Letters 8 Pages

한국탄소학회 Carbon Letters 2017, Vol.23 8 55-62 (8 pages)

Hye Min Kim, Seo Gyun Kim, Heon Sang Lee 저
...
- 3,000원
by controlling the carbon to oxygen (C/O) atomic ratio of the PRGOs. A two-phase solvent exchange method is also proposed to transfer PRGO from water to an aprotic solvent, such as methyl ethyl ketone. We achieve relatively good dispersion in aprotic and non-polar solvents by controlling the C/O atomic ratio of the PRGOs and applying the two-phase solvent exchange method. There is an increase in the glass transition temperatures with the dispersion of PRGOs into amorphous polymers, in particular...
277.

Comparative numerical evaluation for the low velocity impact behavior of T300 and T800 composite system

Jae-Seok Choi, Heung Soap Choi, Soo-Jin Park, Myung Kyun Park 한국탄소학회 Carbon Letters 7 Pages

한국탄소학회 Carbon Letters 2017, Vol.22 9 89-95 (7 pages)

Jae-Seok Choi, Heung Soap Choi, Soo-Jin Park, Myung Kyun Park 저
...
- 3,000원
Carbon fiber reinforced polymer (CFRP) composites have been used for many decades for extreme light weight design purposes in various areas, such as the aerospace industry, automobiles, sports goods and etc. because they provide the advantages of high specific strength and high rigidity [1]. In particular, the fuselage and wings of various aircraft, as well as the load bearing structures and components of mechanical and civil engineering systems are currently being manufactured with CFRP....
278.

Nitrogen-doped carbon nanosheets from polyurethane foams and removal of Cr(VI)

Jiaqi Duan, Baohua Zhang, Huailin Fan, Wenzhong Shen, Shijie Qu 한국탄소학회 Carbon Letters 10 Pages

한국탄소학회 Carbon Letters 2017, Vol.22 7 60-69 (10 pages)

Jiaqi Duan, Baohua Zhang, Huailin Fan, Wenzhong Shen, Shijie Qu 저
...
- 3,000원
Nitrogen-doped carbon nanosheets with a developed porous structure were prepared from polyurethane foams by hydrothermal carbonization following ZnCl2 chemical activation. Scanning electron microscopy, thermogravimetric analysis, Fourier transform infrared spectroscopy, solid state 13C nuclear magnetic resonance (NMR) spectra and X-ray photoelectron spectroscopy were used to characterize the nitrogen-doped carbon nanosheet structure and composition. The removal of Cr(VI) by the N-doped carbon...
279.

EMI shielding effectiveness and mechanical properties of MWCNTs-reinforced biodegradable epoxy matrix composites

Yoon-Ji Yim, Dong Chul Chung, Soo-Jin Park 한국탄소학회 Carbon Letters 6 Pages

한국탄소학회 Carbon Letters 2017, Vol.22 4 36-41 (6 pages)

Yoon-Ji Yim, Dong Chul Chung, Soo-Jin Park 저
...
- 3,000원
Biodegradable epoxy (B-epoxy) was prepared from diglycidyl ether of bisphenol A and epoxidized linseed oil. The mechanical properties of B-epoxy composites reinforced with multi-walled carbon nanotubes (MWCNTs/B-epoxy) were examined by employing dynamic mechanical analysis, critical stress intensity factor (KIC) tests, and impact strength tests. The electromagnetic interference shielding effectiveness (EMI-SE) of the composites was evaluated using reflection and absorption methods. Mechanical...
280.

Improving dispersion of multi-walled carbon nanotubes and graphene using a common non-covalent modifier

Youbin Kwon, Wonbo Shim, Seung-Yeol Jeon, Ji-Ho Youk, Woong-Ryeol Yu 한국탄소학회 Carbon Letters 9 Pages

한국탄소학회 Carbon Letters 2016, Vol.20 8 53-61 (9 pages)

Youbin Kwon, Wonbo Shim, Seung-Yeol Jeon, Ji-Ho Youk, Woong-Ryeol Yu 저
...
- 3,000원
The reportedly synergistic effects of carbon nanotubes (CNTs) and graphene hybrids have prompted strong demand for an efficient modifier to enhance their dispersion. Here, we investigated the ability of poly(acrylonitrile) (PAN) to overcome the van der Waals interaction of multi-walled CNTs (MWCNTs) and graphene by employing a simple wrapping process involving ultrasonication and subsequent centrifugation of PAN/MWCNT/graphene solutions. The physical wrapping of MWCNTs and graphene with PAN was...

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