http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 조현선(Hyeon-Seon Jo) (검색결과 8 건)
- 무료
- 기관 내 무료
- 유료
-
조현선(Hyeon Seon Jo),박상철(Sang Chul Park),장중순(Joong Soon Jang) 한국신뢰성학회 2019 신뢰성응용연구 Vol.19 No.2
Purpose: To ensure normal functioning of an electronic circuit, it is very important to monitor capacitor degradation. Although we canmonitor capacitor degradation by measuring electric characteristics, the capacitors to be measured must be disassembled from the circuit. In this study, a swelling-based failure prediction methodology for electrolytic capacitors that does not require disassembly of capacitors from the circuit is proposed. Methods: It is possible to measure the swelling length of a capacitor by using a computer-visionbased technique. In the experiment conducted in this study, deterioration was induced in 30 capacitors (Samwha, 50 V 1500 ìF) by applying reverse voltage. Through regression analysis, we can predict the capacitance of a capacitor based on its swelling length. Results: As capacitor deterioration progressed, capacitor swelling length, ESR value, and loss value increased, and capacitance decreased. Conclusion: It is possible to monitor capacitor degradation by measuring the swelling length of a capacitor because the results of the regression analysis show that the swelling length is strongly related to the electrical performance characteristics of a capacitor.
-
-
-
조현선(Hyeon Seon Jo),김소정(So Joung Kim),장중순(J.S Jang) 대한산업공학회 2018 대한산업공학회 추계학술대회논문집 Vol.2018 No.11
차세대중형위성은 중대형급 실용위성에 비해 상대적으로 짧은 기간과 저렴한 비용으로 개발할 수 있어 산업화에 유리하다. 이에 공학 탑재체, 영상레이더 탑재체 등의 기기자료처리장치(IDHU)의 국산화에도 많은 관심이 이어지고 있다. IDHU는 위성탑재컴퓨터의 제어 명령에 따리, 탑재체 센서에서 측정된 자료를 수신하여 대용량 메모리에 저장하고, 이후 암호화 및 CCSDS 형식으로 변환하는 과정을 거쳐 송신장치에 전송하는 기능을 수행하는 탑재 장치이다. 우주항공부품에 대한 고장은 고위험과 고실패비용으로 이어질 수 있기 때문에 높은 신뢰성이 요구된다. 따라서 본 논문에서는 MIL-HDBK217에 기반하여 IDHU의 신뢰성을 예측하고 제품의 신뢰성을 향상시킬 수 있는 방안을 제시한다.
-
-
참취 데치기 최적 공정 확립과 추출물의 항산화 특성 변화
조현선(Hyeon Seon Jo),하유진(Yoo Jin Ha),김연태(Yeon Tae Kim),강길남(Gil Nam Kang),유선균(Sun Kyun Yoo) 한국유화학회 2017 한국응용과학기술학회지 Vol.34 No.1
본 연구는 참취의 데치기 최적 공정 조건을 확립하고 조건마다 생산된 추출물의 총 페놀 화합물, 플라보노이드의 함량, DPPH를 분석을 수행하여 항산화 활성의 변화를 연구하였다. 데치기 최적공정은 시간 과 온도를 요인으로 하여 표면반응분석법으로 수행을 하였다. 데치기 공정 후에 추출물을 제조하여 데치기가 총 페놀함량, 플라보노이드, DPPH radical 소거능에 미치는 영향을 분석하였다. 본 연구에서 시행한 데치기 시간 및 온도 범위에서 총 페놀 함량의 범위는 13.00 - 35.48 mg/g 이고 최대예측 총 페놀함량은 35.48 mg/g, 플라보노이드는 함량의 범위는 2.35 - 8.38 mg/g 이고 최대 예측 플라보노이드 함량은 8.38 mg/g, DPPH 라디칼 소거능의 범위는 42.10 - 67.14%이고 최대 예측 DPPH 라디칼 소거능은 67.14%로 측정 되었다. 전체적으로 보면 총 페놀 함량, 플라보노이드, DPPH radical 소거의 변화는 데치기 시간 보다 온도에 영향을 받는 것으로 나타났다. 총 페놀 함량의 경향을 보면 데치기 시간에 따라 급격히 증가하는 것으로 보였지만 플라보노이드 함량의 경우 데치기 온도가 증가함에 따라 급격히 감소하는 것으로 나타났다. 하지만 총 항산화능은 데치기 온도 및 시간에 따라 증가하다가 감소하는 것으로 나타났다. This study was conducted to investigate the change of Aaster scaber antioxidative activity, total phenolic compounds and flavonoids during the blanching processes. With two parameters such as blanching time and temperature, response surface methodology and central composite design was used to study the combined effect of blanching time (90 to 162 sec) and blanching temperature (75 to 99℃). We found that antioxidative activity, total phenolic compounds and flavonoids during the blanching processes were influenced by blanching temperature and time. Within process condition, total phenolic compounds and flavonoids were extracted 3.00 - 35.48 mg/g and 2.35 - 8.38 mg/g, respectively. DPPH radical scavenging activity was 42.10 – 67.14%. The change of total phenolic compounds, flavonoids, and DPPH radical scavenging activity was dependent of blanching temperature more than time. The total phenolic compounds was increased as temperature rise, but flavonoids not. However, DPPH radical scavenging activity was increased during the blanching process.
-
밤 가공 부산물의 반추가축용 사료 가치 평가: in vitro 반추위 배양
정신용,조현선,박기수,강길남,조남철,서성원,Jeong, Sin-Yong,Jo, Hyeon-Seon,Park, Gi-Su,Kang, Gil-Nam,Jo, Nam-Chul,Seo, Seongwon 충남대학교 농업과학연구소 2012 Korean Journal of Agricultural Science Vol.39 No.3
During the manufacturing process of chestnut, 50% of biomass is produced as chestnut shell (CS) or chestnut hull (CH), a forestry by-product. Due to its high fiber content and economic benefit, there is a possibility of using chestnut hull as a supplement for a ruminant diet. Few studies, however, have been conducted on evaluating nutritive value of chestnut hull for ruminant animals. The objective of this study were thus to analyze chemical composition of CS, a by-product after the first processing of chestnut, and CH, a by-product after the second processing, and access in vitro rumen fermentation characteristics of them. For the in vitro fermentation using strained rumen fluid obtained from a fistulated Hanwoo steer, commercial total mixed ration (TMR) for dairy goat was used as a basal diet and was replaced with different proportions of chestnut shell and hull. A total number of 13 treatments were carried out in this study: 100% TMR, 100% CS, 100% CH, a mix with 50% CS and 50% of CH (MIX), TMR replaced with 5%, 10%, or 15% of CS, CH, or MIX, respectively. For each treatment, in vitro dry matter digestibility (IVDMD) and pH after 48 hours of rumen fermentation were measured. Gas production at 6, 12, 24, 48 hours of incubation was also analyzed. Compared to CH, CS contains higher level of fiber (NDF, ADF, lignin) and consequently has a lower amount of non-fiber carbohydrate, but no difference was observed in the other nutrients (i.e. crude protein, crude fat, and ash). IVDMD was significantly (p<0.05) the highest in 100% CH (71.97%) and the lowest in 100% CS (42.80%). Addition of CH by replacing TMR did not affect IVDMD, while an increase in the proportion of CS tended to decrease IVDMD. The total gas production after 48 hours of incubation and the rate of gas production were also the highest in 100% CH and the lowest in 100% CS (P<0.05). Likewise, the pH after 48 hours of fermentation was significantly (p<0.05) the lowest in 100% CH (6.33) and the highest in 100% CS (6.50), and no significant difference in gas production was observed when TMR was replaced with CS or CH up to 15% (P>0.05). In conclusion, CH may successfully be used for a supplement in a ruminant diet. The nutritive value of CS is relative low, but can replace, if not 100%, low quality forage. This study provides valuable information about the nutritive value of CS and CH. An in vivo trials, however, is needed for conclusively accessing the nutritive value of CS and CH.
-
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
