0.18um CMOS 공정을 이용한 강압형 DC-DC 컨버터 보호회로 구현 및 측정

송원주,송한정 한국산업융합학회 2018 한국산업융합학회 논문집 Vol.21 No.6

DC-DC buck converter is a critical building block in the power management integrated circuit (PMIC) architecture for the portable devices such as cellular phone, personal digital assistance (PDA) because of its power efficiency over a wide range of conversion ratio. To ensure a safe operation, avoid unexpected damages and enhance the reliability of the converter, fully-integrated protection circuits such as over voltage protection (OVP), under voltage lock out (UVLO), startup, and thermal shutdown (TSD) blocks are designed. In this paper, these three fully-integrated protection circuit blocks are proposed for use in the DC-DC buck converter. The buck converter with proposed protection blocks is operated with a switching frequency of 1 MHz in continuous conduction mode (CCM). In order to verify the proposed scheme, the buck converter has been designed using a 180 nm CMOS technology. The UVLO circuit is designed to track the input voltage and turns on/off the buck converter when the input voltage is higher/lower than 2.6 V, respectively. The OVP circuit blocks the buck converter’s operation when the input voltage is over 3.3 V, thereby preventing the destruction of the devices inside the controller IC. The TSD circuit shuts down the converter’s operation when the temperature is over 85°C. In order to verify the proposed scheme, these protection circuits were firstly verified through the simulation in SPICE. The proposed protection circuits were then fabricated and the measured results showed a good matching with the simulation results.

PMIC를 위한 source follower 방식의 LDO 레귤레이터 설계

송원주(Won-ju Song),이자경(Ja-kyeong Lee),아시스쿠마르(Ashish Kumar),강보경(Bo-Gyeong Gang),송한정(Han-Jung Song) 대한전기학회 2017 정보 및 제어 심포지엄 논문집 Vol.2017 No.10

국가표준식품성분표 개정을 위한 국내산 돈육의 부위별 비타민 B₁₂ 함량 분석

문금주,송원주,박선혜,정범균,정길락,최갑성,김진형,최용민,천지연,Mun, Geum-Ju,Song, Wonju,Park, Sun-Hye,Jeong, Beom-Gyun,Jung, Gil-Rak,Choi, Kap Seong,Kim, Jin-Hyoung,Choi, Youngmin,Chun, Jiyeon 한국식품저장유통학회 2017 한국식품저장유통학회지 Vol.24 No.7

본 연구는 국민 영양평가 및 정책 수립에 근간이 되는 국가표준식품성분표 개정을 위해 농촌진흥청과 국립축산과학원이 공동으로 국산 돈육의 대표 시료를 선정하고 부위별로 신뢰성이 확보된 vitamin $B_{12}$ 함량 데이터 구축을 위해 분석법 검증과 분석품질관리를 수행한 연구이다. Immunoaffinity-HPLC 분석법을 특이성, 직선성, 검출한계 및 정량한계, 정확성, 정밀성 등의 분석수행특성 지표를 이용하여 평가한 결과 모든 항목에서 AOAC 가이드라인 수용기준에 충족되는 것을 확인하였다. 또한 모든 시료 분석 시 in-house QC sample을 분석한 결과 QC chart의 관리한 계선 안에 포함이 되어 본 연구 기간 동안 수행된 모든 시료 분석이 관리하에 정확성과 정밀성을 나타내는 분석값임을 확인할 수 있었다. 총 7개 primal cut과 이들로부터 세분화된 22개 retail cut의 vitamin $B_{12}$ 함량 분석 결과 주요 부위(평균 $0.42-0.69{\mu}g/100g$) 뿐 만 아니라 같은 부위 안에서도 세부 부위에 따라 vitamin $B_{12}$ 함량에서 차이가 나타났다. 특히, 삼겹살과 목심 부위에서 vitamin $B_{12}$ 함량이 높게 나타났으며 세부 부위에서는 삼겹살 부위의 토시살이 $0.98{\mu}g/100g$로 최고값을 보였고, 등심 부위의 알등심살과 뒷다리 부위의 홍두깨살이 $0.33{\mu}g/100g$으로 가장 낮은 수준을 나타냈다. Vitamin $B_{12}$ 함량은 돈육의 부위별 단백질 함량과는 유의적인 차이를 보였으나 지방 및 수분 함량과는 유의적인 차이를 보이지 않았다. 본 연구에서 생산된 국내산 돈육의 부위별 vitamin $B_{12}$ 함량 데이터는 분석법 검증과 분석품질관리를 통하여 신뢰성이 확보된 데이터로 국가표준식품성분표 개정에 활용될 수 있을 것으로 기대된다. This study was performed to update the National Standard Food Composition Table (NSFCT) published by Korea Rural Development Administration, especially focusing on vitamin $B_{12}$ for Korean pork. Total 7 primal and 22 retail fresh cuts of Korean pork were analyzed for vitamin $B_{12}$ and the applied immunoaffinity-HPLC was validated. Vitamin $B_{12}$ assay by immunoaffinity-HPLC obtained recoveries over 95% and coefficient variations of precision below about 10%, which met the limits required for validation acceptance. Limits of detection and quantification of immunoaffinity-HPLC were 0.01 and $0.33{\mu}g/100g$, respectively. Quality control chart showed that analysis performance was excellent during the entire of study. Vitamin $B_{12}$ contents of pork cuts significantly varied depending the types of primal and its retail cuts (p<0.05). Belly, Boston butt, rib cuts showed relatively high vitamin $B_{12}$ contents compared to other primal cuts. Vitamin $B_{12}$ content of pork retail cuts were also significantly different within the same primal cuts (p<0.05). Among 22 retail cuts, the highest vitamin $B_{12}$ was observed in Tosisal in belly primal part ($0.98{\mu}g/100g$) while both Aldeungsimsal in loin and Hongdukkaesal in hide leg were the lowest by $0.33{\mu}g/100g$. This study provides reliable vitamin $B_{12}$ data for the Korean pork fresh cuts through standard sampling, method validation and analytical quality control, which would be used for update of Korean NSFCT.

비진공 전기방사를 이용한 전도성을 가지는 나노섬유 제작

김관수,조원주,송기봉 한국진공학회 2014 한국진공학회 학술발표회초록집 Vol.2014 No.2

국가표준식품성분표 개정을 위한 국내산 돈육의 부위별 비타민 B12 함량 분석

문금주,송원주,박선혜,정범균,정길락,최갑성,김진형,최용민,천지연 한국식품저장유통학회 2017 한국식품저장유통학회지 Vol.24 No.7

This study was performed to update the National Standard Food Composition Table (NSFCT) published by Korea Rural Development Administration, especially focusing on vitamin B12 for Korean pork. Total 7 primal and 22 retail fresh cuts of Korean pork were analyzed for vitamin B12 and the applied immunoaffinity-HPLC was validated. Vitamin B12 assay by immunoaffinity-HPLC obtained recoveries over 95% and coefficient variations of precision below about 10%, which met the limits required for validation acceptance. Limits of detection and quantification of immunoaffinity-HPLC were 0.01 and 0.03 μg/100 g, respectively. Quality control chart showed that analysis performance was excellent during the entire of study. Vitamin B12 contents of pork cuts significantly varied depending the types of primal and its retail cuts (p<0.05). Belly, Boston butt, rib cuts showed relatively high vitamin B12 contents compared to other primal cuts. Vitamin B12 content of pork retail cuts were also significantly different within the same primal cuts (p<0.05). Among 22 retail cuts, the highest vitamin B12 was observed in Tosisal in belly primal part (0.98 μg/100 g) while both Aldeungsimsal in loin and Hongdukkaesal in hide leg were the lowest by 0.33 μg/100 g. This study provides reliable vitamin B12 data for the Korean pork fresh cuts through standard sampling, method validation and analytical quality control, which would be used for update of Korean NSFCT.

Effect of low temperature microwave irradiation on high-k oxide condition in MOSCAP

안재인,표상연,송유빈,조원주 한국진공학회 2017 한국진공학회 학술발표회초록집 Vol.2017 No.2

한국 지역특화음식의 콜레스테롤, 레티놀, 베타카로틴 및 비타민 E 분석

박선혜(Sun-Hye Park),송원주(Wonju Song),천지연(Jiyeon Chun) 한국식품영양과학회 2018 한국식품영양과학회지 Vol.47 No.4

본 연구에서는 각 지역특화음식 42종에 함유된 콜레스테롤, 레티놀, 베타카로틴 및 비타민 E 함량을 분석하고 각 성분 분석에 적용된 분석법의 유효성과 분석품질관리를 수행하여 국내 지역식단에 대한 신뢰도 높은 데이터를 생산하여 국가영양성분 데이터베이스 구축을 위한 기초자료를 제공하고자 하였다. 각 분석법의 검출한계, 정량한계, 정확성 및 정밀성을 분석한 결과, 모든 지표에서 AOAC 가이드라인 기준에 충족되었으며 품질관리도표 관리를 통하여 전 연구기간 동안 모든 분석이 검증된 조건에 따라 신뢰성 있게 수행되었음이 확인되었다. 분석된 지역특화음식의 콜레스테롤 함량은 짚불구이곰장어(기장), 모래집튀김(대구), 붕장어 소금구이(고흥), 오징어순대(속초), 닭갈비(춘천) 순으로 높게 나타났는데, 이들 음식을 한 끼 식사로 250 g을 섭취 시 일일 상한섭취량의 50%가 넘는 수준에 미치는 것으로 나타났다. 레티놀 함량의 경우 짚불구이곰장어(기장, 1,101.48 ㎍/100 g), 붕장어소금구이(고흥, 438.72 ㎍/100 g), 곰치국(삼척, 139.00 ㎍/100 g)에서 비교적 높게 검출되었으며, 그 외 음식들은 0.00~25.05 ㎍/100 g 범위로 대부분 낮은 함량을 보이거나 검출되지 않았다. 반면에 베타카로틴은 짚불구이곰장어를 제외한 모든 음식에서 넓은 범위로 검출되었으며, 곤드레나물밥(정선, 1,185.91 ㎍/100 g), 밴댕이무침(인천, 1,028.97 ㎍/100 g), 붕어찜(광주, 760.42 ㎍/100 g), 매생이국(장흥, 728.37 ㎍/100 g), 서대회무침(여수, 700.77 ㎍/100 g) 등의 순으로 높게 나타났다. 한 끼 식사량 250 g으로 지역특화음식을 섭취 시 섭취되는 ㎍ RAE로 환산된 비타민 A 함량은 0.08~2,753.70 ㎍ RAE 범위였는데, 이는 짚불구이곰장어, 붕장어소금구이, 곰치국을 제외한 나머지 음식은 비타민 A 하루권장량의 30% 이하 수준을 섭취할 수 있는 것으로 확인되었다. 한편 ㎎ α-TE/100 g으로 나타낸 지역특화음식의 비타민 E 함량은 서울 및 경기 0.09~2.08, 강원도 0.18~1.75, 충청도 0.36~0.97, 경상도 0.07~2.80, 전라도 0.10~3.05 범위를 보였는데 이를 한 끼 식사로 250 g을 섭취 시 비타민 E 일일 충분섭취량(12 ㎎ α-TE)의 약 1.40~63.52%를 충족하는 것으로 나타났다. 본 연구에서 생산된 지역특화음식 중의 지용성 성분 데이터는 분석법 검증과 분석품질관리를 통하여 데이터의 신뢰도가 확보된 결과로서, 국내 지역특화음식에 대한 영양성분 데이터베이스 구축을 위한 기초자료로 활용 가능할 것으로 생각된다. A total of 42 regional foods of South Korea were regionally sampled (metropolitan city 8, Gangwon 8, Chungcheong 5, Gyeongsang 10, and Jeolla 11) and analyzed for their cholesterol, retinol, β-carotene, and vitamin E contents. All applied analytical methods were verified, and analytical quality control was performed during the entire of study. The cholesterol contents (㎎/100 g) of the 42 regional foods were high in the order of Jipbulgui kkomjangeo (Gyeongsang) 170.9, Moraejip twigim (Gyeongsang) 167.9, and Bungjangeo sogeum gui (Jeolla) 167.1, which indicate that 100 g intake of these foods would exceed 50% of the upper intake level per day (UL, 300 ㎎ for adult). However, on the basis of 100 g intake, the other foods contained cholesterol contents of less than 20% of cholesterol UL. Retinol content (㎍/100 g) was high in a few foods prepared mainly from animal sources such as Jipbulgui kkomjangeo (1,101.5), Bungjangeo sogeum gui (438.7), and Gomchi guk (139.0), while it was not detected in the 25 other foods. On the other hand, β-carotene was detected in all foods except for Jipbulgui kkomjangeo, showing a range from 0∼1,185.9 ㎍/100 g. Vitamin A content (㎍ retinol activity equivalent/100 g) was highest in Jipbulgui kkomjangeo (1,101.5) while Chodang sundubu (0.03) showed the lowest content. Vitamin E contents (㎎ α-tocopherol equivalent/100 g) of regional foods ranged from 0.07 (Dwaeji-gukbap)∼3.05 (Bungjangeo sogeum gui), which correspond to 0.6∼25.4% of the daily adequate intake amount (12 ㎎ for adults). All analytical methods for fat-soluble components using HPLC and GC showed good accuracy (85.5∼101.6% recoveries) and precision (<5% relative standard deviations), which met the requirements of official method validation guidelines. All verification and quality control data in this study indicate that all analytical data are reliable enough to be used for the construction of cholesterol, retinol, β-carotene, and vitamin E databases for regional diets in Korea.

디젤엔진 연료분사관의 자긴가공

고승기(Koh S.K),송원주(W.J. Seo),서광선(Seo K.S),최현선(Choi H.S) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5

In order to investigate the optimum condition of the autofrettage process for the diesel engine injection pipe, different values of autofrettage pressure, pressure rising time, pressure holding time, and repetition of autofrettage process were applied. Autofrettage was preformed by applying the hydrostatic internal pressures of 603 ㎫, 535 ㎫, 500 ㎫ on the fuel injection pipe, corresponding to theoretically 50%, 30%, and 20% overstrain levels, respectively. The autofrettage residual stresses in the injection pipe were experimentally determined by using X-ray diffractometer. As the overstrain level increased, the magnitude of compressive residual stress at the bore increased. It was found that the rising time to reach the autofrettage pressure, holding time at the autofrettage pressure, and repeating application of the autofrettage pressure on the pipe had no significant influence on the residual stress distributions.

가전기기를 위한 파워모듈의 신뢰성 특성해석

모영세(Young-Sea Mo),한예지(Yeji Han),송원주(Wonju Song),강보경(Bogyeong Gang),송한정(Han-Jung song) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6

A SPECTRE Flash EEPROM Model for Circuit Simulation

AlaaDdin Al-Shidaifat(알라딘),Yeji Han(한예지),Wonju Song(송원주),Sandeep Kumar(쿠마르 산딥),Won-Young Jung(정원영),Hanjung Song(송한정) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6