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부분예혼합 저NOx Dual 버너가 설치된 수관식 보일러 연소실 수치해석
안준 한국연소학회 2018 한국연소학회지 Vol.23 No.4
A series of numerical simulations have been conducted for a combustion chamber of a water tube type boiler with dual partial-premixed burners. The burner was expected to give shorter flame to make the boiler be more compact. Two burners were predicted not to interact strongly so as to yield two semi-independent flames. 50% partial load operations were tried with 3 modes and the mode with lower burner was predicted to transfer heat to the combustion chamber most effectively.
안준,문준철,김주희,김금솔,장철성 한국응용생명화학회 2019 Applied Biological Chemistry (Appl Biol Chem) Vol.62 No.-
Berry fruits have attracted attention because of their purported benefits for aging, cardiovascular disease, and cancer. Therefore, highly priced berry fruits might be targets for food adulteration and fraud. In this study, eight speciesspecific primer sets based on the single nucleotide polymorphism of the chloroplast genomes of four berry fruits (aronia, blackberry, cranberry, and strawberry) were developed for quantitative real-time PCR (qPCR) analysis by SYBR Green staining with the aim of preventing berry fruit food fraud. The developed primer pairs exhibited high efficiencies ranging from 88 to 110% with strong correlation coefficients ( R2 > 0.99) for the amplification of each target species. However, no clear correlation coefficients were evident for non-target species. To evaluate the practicality of the developed primers, 18 commercial berry fruit products were verified by qPCR analysis. The developed primer pairs were amplified to a low Ct value (range 16.1–23.3) for the target species and proved capable of detecting target species in berry fruit commercial foods. Therefore, the developed qPCR-based species-specific markers could be suitable for the prevention of berry fruit food fraud and to verify marker reliability.
친유 처리를 한 접선 방향 입구를 갖는 사이클론 방식 유분리기의 성능 특성
안준,장성일 대한설비공학회 2019 설비공학 논문집 Vol.31 No.3
CFD analysis shows that if the inlet of a cyclone type oil separator is eccentric; the pressure drop can be reduced while increasing the separation efficiency. It has also been shown that the application of oleophilic surfaces can lead to higher separation efficiency but lead to increased pressure drop. In the present study, an oil separator with an eccentric inlet was fabricated and the CFD prediction results tested through performance evaluation in the actual refrigeration cycle. When the inlet of the cyclone type oil separator is eccentric, the improvement in the separation efficiency was not significant compared with the result predicted using numerical analysis, but the pressure drop was greatly reduced. In conclusion, the pressure loss is greatly reduced when the inlet is eccentric. The separation efficiency was enhanced by about 15% with a 30% reduction in pressure drop with the application of an olephilic surface treatment on the geometry. 본 연구에서는 입구를 편심한 사이클론 방식의 유분리기를 제작하고 내부의 나선형 구조물과 몸체 벽면에친유 처리를 하여 냉동기에 장착한 후 성능을 평가하였다. 이를 통해 얻은 주요 결론은 다음과 같다. (1) 사이클론 방식의 유분리기의 입구를 편심할 경우 수치해석으로 예측한 결과에 비해 분리효율의 향상은크지 않으나 압력강하는 크게 저감할 수 있는 것으로 나타났다. (2) 사이클론 방식의 유분리기에 친유성 표면을 적용할 경우 분리효율은 크게 향상되나 입구가 중앙에 위치한경우와 편심한 경우 모두 추가적인 압력 손실이 유발되었다. (3) 입구를 편심할 경우 압력손실을 크게 완화하여 친유성 표면처리를 병행하였을 때 기성품과 비교하였을때 분리효율 15% 향상 및 압력강하 30% 저감을 동시에 달성할 수 있었다.
안준,문준철,장철성 한국응용생명화학회 2018 Applied Biological Chemistry (Appl Biol Chem) Vol.61 No.5
Human consumption of plant functional foods has been rapidly increasing owing to the health benefits they provide. In particular, in Korea, the plant Orostachys japonica has attracted attention for its anticancer and other effects. Of the 12 established Orostachys species, only three (viz., O. iwarenge, O. malacophyllus, and O. japonica) have been allowed for use as foods in Korea. In this study, 12 species-specific primer sets based on single nucleotide polymorphisms of five chloroplast genes and one nuclear gene were developed to discriminate Orostachys species through quantitative real-time PCR (qPCR) analysis with SYBR Green staining. The efficiencies of the designed primer pairs in amplifying the target species ranged from 80 to 110%, with strong correlation coefficients (R2[0.99), whereas no clear correlation coefficient was evident for the non-target species. In order to verify the specificity of the 12 developed Orostachys-specific primers, binary mixtures of the DNAs (tenfold serially diluted samples) from the target species and each of the other non-target species were generated for qPCR analysis, with results suggesting that the primers could clearly discriminate at least 0.1% of O. japonica DNA (10 pg) in the mixtures. With regard to the feasibility of the developed qPCR system for detecting Orostachys species in O. japonica food products, O. japonica DNA was detected in all eight commercial products tested, with low Ct values (\20), whereas none of the other Orostachys species DNAs were detected, confirming that the tested foods contained only O. japonica. Therefore, developed primers and qPCR conditions would be useful for verifying the authenticity of commercial O. japonica food products.