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ICT 활용 교육 측면에서 제7차 교육과정에 따른 과학 교과서 분석
차정호,노정아,노태희 한국과학교육학회 2005 한국과학교육학회지 Vol.25 No.2
이 연구에서는 제7차 교육과정에 따라 개발된 과학 교과서를 ICT 활용 교육 측면에서 분석하였다 초등 과학 교과서에는 인터넷 주소, 검색어, 활동과 같은 ICT 요소들이 매우 적게 나타났다. 7, 8학년의 교과서는 인터넷 주소가 많은 반면에 9, 10학년은 검색어가 많았다. 많은 인터넷 주소가 접속이 안 되거나(37.4%) 관련된 정보가 없었다(6.0%). 또한 이들 대부분은 부록에 제시되었다 많은 검색어가 단어 형태로 제시되었으며, 주요 개념과 관련된 정보를 검색하는 기능을 하였다. 활동은 주로 정보 탐색 하기였으며, 자료해석과 자료변환과 같은 탐구과정을 요하는 것이었다. In this study, science textbooks developed under the 7th national curriculum were analyzed in the aspect of ICT applied education. In primary science textbooks, the ICT components such as internet address, retrieval tern, and activity were found to be rare. While the textbooks for 7th- and 8th-grades included more internet addresses, those for 9th- and 10th-grades included more retrieval terms. Many internet addresses were not linked (37.4%) or did not contain related informations (6.0%). Most were also introduced in appendix. High percentages of retrieval terms were presented as word, and their function was information retrieval related to main concepts. Activities were mainly for exploring information, and required to inquiry processes such as data interpretation and data transformation.
Jeongho Jeong,Mi Kyung Lim,Soyeon Lee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Angelica gigas is a medicinal plant that exclusively has grown in Asia. It is divided into three species according to its geographical origin, and is known to have various physiological effects such as anti-cancer and anti-amnesia. In this study, we performed in vitro Griess assays to investigate regulatory function on nitric oxide (NO) production by treatment of Angelica gigas extracts (ANE) in Lipopolysaccharide (LPS)-stimulated RAW264.7 cells or mock cells, and further proceed DPPH Antioxidant assay in order to evaluate the anti-oxidant effect of ANE. As a result, excessively produced NO by stimulation of LPS, was reduced in a dose-dependent manner when RAW264.7 cells were treated with ANE, which indicating anti-inflammatory effect. Whereas, in mock cells not to be treated with LPS, NO concentration increased by the ANE treatment, resulting in immuno-enhancement effect. In addition, ANE has anti-oxidant capacity through outstanding DPPH radical scavenging activity. In conclusion, our results suggest that ANE might have potential as a functional ingredient for mediating immune responses via regulatory function of NO production and exerting anti-oxidant activity.
25-Gb/s Clocked Pluggable Optics for High-Density Data Center Interconnections
Jeong, Gyu-Seob,Hwang, Jeongho,Choi, Hong-Seok,Do, Hyungrok,Koh, Daehyun,Yun, Daeyoung,Lee, Jinhyung,Park, Kwanseo,Ko, Han-Gon,Lee, Kwangho,Joo, Jiho,Kim, Gyungock,Jeong, Deog-Kyoon IEEE 2018 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 2 E Vol.65 No.10
<P>This brief presents a clocked pluggable optics suitable for high-density data center interconnections. The proposed architecture performs a SERDES function at the module side by exploiting a forwarded clock from the ASIC. Due to the relaxed channel loss of the ASIC-to-module interface, the use of power-hungry equalizers can be avoided. Based on an 850-nm multi-mode fiber interface, a 25-Gb/s link operation is demonstrated. A vertical-cavity surface-emitting laser-based transmitter outputs an optical modulation power of 0.6 mW. The optical receiver sensitivity is measured to be −7.5 dBm at 21.2 Gb/s with an optical excitation, and <TEX>$120~{\mu }\text{A}_{\text{pp}}$</TEX> at 25 Gb/s with an electrical excitation. The jitter tracking capability of the implemented clock and data recovery is evaluated in the presence of ±100-ppm frequency offsets and the measured jitter tolerance complies with the 100 GbE specification well. The optical transceiver is implemented in 65-nm CMOS technology and consumes 281 mW at 25 Gb/s, corresponding to the energy efficiency of 11.2 pJ/b.</P>
Changes on Speech Transmission Characteristics by Types of Mask
Jeongho Jeong,Mina Kim,Youngsun Kim 한국청각언어재활학회 2020 Audiology and Speech Research Vol.16 No.4
Purpose: Given the increased levels of fine and ultrafine dust, as well as the spread of COVID-19, current opinion is that most people will wear a face mask such a KF94 mask for a long time. To test speech transmission through the face masks, various types of masks including dust masks available in the market at the time of the study were tested under laboratory conditions. Methods: Fourteen types of masks worn on a head and torso simulator (HATS) and test signals were played on a speaker installed in the mouse position of the HATS. Speech Transmission Index (STI) and the speech level in the octave band were measured at distances of 1 m and 2 m. Results: STI at a distance of 2 m was decreased to 3.4-5.7% and speech levels in the octave band at 4 kHz or higher were also decreased when wearing disposable masks and a cotton mask. KF80 and KF94 masks showed decreased STI similar to those of disposable masks; however, a decrease in the speech level was observed at the octave bands of above 2 kHz. Dust masks and single-cartridge half-face respirators showed approximately 11.2% and 33.7% to 39.3% decreases in STI levels, respectively. Conclusion: When wearing masks, STI and the speech level was decreased in the high-frequency bands. However, speech level differences at high frequencies may be related to the increased voice level of the speaker and the understanding of consonants with the masks for several hours in living and working environments.
A 32 Gb/s, 201 mW, MZM/EAM Cascode Push–Pull CML Driver in 65 nm CMOS
Hwang, Jeongho,Jeong, Gyu-Seob,Bae, Woorham,Park, Jun-Eun,Yoon, Chang Soo,Yoon, Jung Min,Joo, Jiho,Kim, Gyungock,Jeong, Deog-Kyoon IEEE 2018 IEEE transactions on circuits and systems. a publi Vol.65 No.4
<P>This brief presents a 32 Gb/s driver for a Mach–Zehnder modulator (MZM) and an electro-absorption modulator (EAM). A push–pull current-mode logic driver is chosen to achieve a better power efficiency and a large voltage swing. A double cascode with thin oxide transistors is employed to mitigate the over-voltage stress associated with a large output voltage swing. At the same time, shunt-peaking inductors are incorporated in a compact way to extend the bandwidth and to have a flat group delay. The proposed driver has been fabricated using 65 nm CMOS technology with an active area of 0.086 mm<SUP>2</SUP>. The electrical measurement result shows that the driver exhibits a differential output swing of 4 <TEX>${\text V}_{\text {pp}}$</TEX> at 10 Gb/s. The measured extinction ratios of the driver using the MZM and EAM are 4.53 dB and 4.17 dB, respectively, at 32 Gb/s. The power consumption is 201 mW at 32 Gb/s, which corresponds to an energy efficiency of 6.28 mW/Gb/s.</P>