• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.12
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• pp.2633-2640
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• 2009

We design a small-area, low-power, and high-speed EEPROM for touch screen controller IC. As a small-area EEPROM design, a SSTC (side-wall selective transistor) cell is proposed, and high-voltage switching circuits repeated in the EEPROM core circuit are optimized. A digital data-bus sensing amplifier circuit is proposed as a low-power technology. For high speed, the distributed data-bus scheme is applied, and the driving voltage for both the EEPROM cell and the high-voltage switching circuits uses VDDP (=3.3V) which is higher than the logic voltage, VDD (=1.8V), using a dual power supply. The layout size of the designed 128-KBit EEPROMIP is $662.31{\mu}m{\times}1314.89{\mu}m$.

• Journal of the Korean Recycled Construction Resources Institute
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• v.8 no.4
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• pp.429-435
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• 2020

In this study, physical properties and EMP shielding performance evaluation of cement paste according to the amount of milled carbon fiber was conducted to develop EMP shielding cement using carbon fiber. The length of the milled carbon fiber used was 100㎛, and it was used as a cement admixture because it showed a powdery form to the naked eye. As a result of the experiment, when 5% of the amount of cement was used, the milled carbon fiber was effective in compressive strength and EMP shielding, and the shielding effect did not increase when used beyond that. As a result of examining the EMP shielding performance according to the thickness of the specimen, the plain without milled carbon fiber had no effect of increasing the shielding rate according to the thickness. The shielding performance of the specimens using the milled carbon fiber increased as the thickness increased. Therefore, in order to increase the EMP shielding rate when comparing and evaluating the performance according to the amount of milled carbon fiber used and the thickness of the specimen, 5% of the milled carbon fiber used is optimal. In addition, the method of increasing the thickness is considered to be effective.

• Journal of Korean Elementary Science Education
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• v.41 no.3
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• pp.443-456
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• 2022

This study explores the possibility and development plan for science career education in the lower grades of elementary school. Accordingly, science career education programs were developed and applied. We investigated changes in perception and interest in science before and after the programs, and analyzed surveys, research journals, student worksheets, and interview records. Science career education programs for lower-grade elementary school students have a positive effect on the perception of scientists and science. Moreover, they influence students' interest in science. Lastly, students' perception of this program was positive and gave high marks to all parameters such as interest, participation, and understanding of the program.

• Journal of Software Assessment and Valuation
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• v.15 no.1
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• pp.103-107
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• 2019

Recently, many technologies have been developed to realize low power high speed digital data communication and one of them is related to duty cycle correction. In this paper, a low-area duty cycle correction circuit for a voltage-controlled ring generator is proposed. The duty cycle correction circuit is a circuit that corrects the duty cycle using a 180 degree phase difference of a voltage controlled ring oscillator. The proposed low-area duty cycle circuit changes a conventional flip-flop to a true single phase clocking (TSPC) flip-flop And a low-area high-performance circuit is realized. By using TSPC flip-flop instead of general flip-flop, it is possible to realize low-area circuit compared to existing circuit, and it is expected to be used for high-performance circuit for low-power because it is easy to operate at high speed.

• Cement
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• s.197
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• pp.38-42
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• 2013

2013년은 '저성장'과 '신정부'하에서 패러다임 전환 압력이 고조되는 한 해가 될 것으로 보인다. 이에 삼성경제연구소는 2013년 국내 10대 트렌드의 키워드로 '저성장 지속', '신정부 출범', '패러다임 전환 압력'을 제시하면서 대내외적인 여건 악화로 한국경제가 '저성장' 기조를 유지하는 가운데 신정부가 들어서면서 새로운 패러다임을 모색할 것이라 예상했다. 여기서는 삼성경제연구소의 '203년 국내 10대 트렌드' 보고서를 통해 2013년 국내 경제의 화두를 되짚어 본다.

• The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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• v.15 no.2
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• pp.54-63
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• 2004

무칩 태그(chipless tag)란 마이크로 칩(microchip)을 포함하지 않는 것으로 저가(low cost)의 RFID (Radio Frequency IDentification) 태그이다. '저가 RFID'라는 용어가 사용되기 시작한 것은 비교적 최근으로, 태그의 정보를 인식할 수 있는 거리가 1 m 이하인 경우는 $1 이하, 그 이상의 거리에서는 $5 이하인 경우를 일반적으로 저가 RFID라고 한다.(중략)

• Journal of Korean Electronics
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• v.29 no.8
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• pp.23-27
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• 2009

해외 소비자들의 한국 제품 및 서비스에 대한 가격평가 수준을 분석한 결과, 일본, 독일, 미국에 비해서는 아직도 30%이상 저평가되고 있는 것으로 나타났으나, 저평가 정도는 소폭감소한 것으로 나타났다. 특히 아시아 아프리카 지역이 타지역보다 한국제품을 선진국제품보다 상대적으로 저평가하는 것으로 나타나 이 지역에서의 한국상품의 고급 이미지 구축이 필요한 것으로 보인다.

• 한국항공운항학회:학술대회논문집
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• 2015.11a
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• pp.59-62
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• 2015

급증하고 있는 드론(무인항공기) 분야의 기술 개발과 보급이 활발해지는 효과의 반대급부로서 기존의 유인 항공기 운항의 안전이 위협받고 있다. 본 논문에서는 초경량/소형 드론이 비행하도록 지정된 저고도 공역에 대한 현 제도의 문제를 분석하고 드론의 비행 증가에 따른 항공안전을 확보하기 위한 저고도 공역 재설정을 포함한 공역 제도 개선 방안을 제안한다.

• 가정의 벗
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• v.37 no.10 s.434
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• pp.30-31
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• 2004

저출산 문제는 일본, 한국, 홍콩, 유럽 등 모든 선진국에서 매우 심각하고 심지어 가톨릭 국가인 이태리나 스페인에서도 매우 심각하다. 미국은 이민을 많이 받아들이고 있어 유일하게 예외적이다. 싱가폴에서도 저출산은 매우 심각한 국가문제로 결혼, 자녀, 육아, 직장에서 행복한 가정생활에 필요한 여건과 제도 마련을 위해 노력하고 있다.

• Journal of Nutrition and Health
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• v.44 no.2
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• pp.131-139
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• 2011

The purpose of this study was to obtain information related to life style characteristics, school achievement and snacking behaviors among underweight and overweight adolescents in Ulsan area. The survey was carried out by self-questionnaires with 464 adolescents (333 underweight and 131 overweight). The results were as follows: Average BMI of the subjects was $19.81{\pm}3.10\;kg/m^2$ which was normal range, but average BMI of underweight and overweight were $16.90{\pm}1.19\;kg/m^2$ and $25.38{\pm}2.16\;kg/m^2$ respectively. The 49.5% of underweight and 94.7% of overweight students have correct perception about their body image. In the sleeping time, 58.9% of underweight and 66.4% of overweight students go to bed after PM 12 o'clock. In the regularity of eating breakfast, 68.5% of underweight and 67.9% of overweight students skipping breakfast at least 5 times per week. 32.6% of the subjects had snack once or more a day. Underweight students had more frequently ate snack than overweight students. The criteria of choosing snack were taste (77.4%), nutrition (9.3%), and price (6.3%). Food as snack they frequently had fruits, milk & milk products, cookies in order. Underweight students had more dodkboki & sundae, candy & chocolate and cake & bread than overweight students, although overweight students had more milk & yogurt than underweight students. The group who had a higher school record, they significantly had more fruits, milk & milk products (p < 0.01) and had not less nutritious foods (p < 0.001). This study may provide basic information on weight status, sleeping and snacking behaviors of adolescents. Therefore they should have nutrition education program to improve their life style and snacking patterns for underweight and overweight adolescents toward healthy weight.