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Toroidal Propeller 와 Conventional Propeller 의 동일 추력 대비 소음 비교 실험 및 전산유체역학 시뮬레이션
윤재윤(Jae Yoon Yoon),김윤주(Yoon Ju Kim),김도균(Dokyun Kim) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
With the expansion of the drone industry, there is growing evidence suggesting that drone noises—spanning ultrasound and subultrasound frequencies—can adversely impact human sleep, concentration, and memory. As drones become more integrated into daily life, regulations concerning their noise emissions will likely be established, leading to an increased demand for high-performance drones with reduced noise output. Recently, MIT introduced an annular propeller design that diverges from traditional propeller shapes, aiming to optimize performance while minimizing noise. In the present study, the noise generated by this new propeller design has been experimentally measured and compared to the DJI-Phantom 3 propeller under identical thrust conditions. In addition, the flow around the blade was simulated using Star-CCM software for further analysis.
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첨가당 종류에 따른 파인애플 와인의 이화학적 및 관능 특성
윤재윤 ( Jae Yoon Yoon ),최용근 ( Yong Keun Choi ),박정수 ( Jung Soo Park ),정희훈 ( Heehoon Jung ),송학진 ( Hakjin Song ),전현진 ( Hyeon Jin Jeon ),이정창 ( Jung Chang Lee ),김형주 ( Hyung Joo Kim ) 한국산업식품공학회 2015 산업 식품공학 Vol.19 No.3
본 연구는 파인애플로 제조한 와인의 과실주의 제조 가능성을 조사하고, 첨가당의 종류가 발효과정에 어떠한 영향을 주는지를 알아보고자 실시하였다. 발효과정이 진행되는 동안 당도와 알코올 농도의 변화는 첨가한 당의 종류에 따라 다르게 변화 하였다. 당을 첨가하지 않은 과즙의 경우 가장 먼저 알코올의 증가가 종료되었으며, 특히, 포도당을 첨가한 와인에서 가장 많은 알코올(12.8%)이 생성되어 효모의 당 이용성이 높은 것으로 나타났다. 유기산은 모든 와인에서 citric acid와, malic acid, acetic acid, succinic acid 및 lactic acid가 검출되었으며, 그 밖에 oxalic acid도소량 존재하였다. 그 중에서 설탕을 첨가한 와인에서 citric acid (0.335 mg/mL)와 malic acid (0.127 mg/mL) 함량이 높게 나타났으며, 또한, 가장 많은 유기산이 측정되었다. 총페놀 함량 및 항산화 활성도(DPPH 라디칼 제거능)는 파인애플 제조 와인에서 약 950 mg/L 및 약 4,900 mg/L으로 나타났다. 관능검사 결과는 비전문가 집단과 비교하여 전문가 집단에서 기호도는 당을 첨가하지 않는 와인에서 가장 높게 나타났다. 특히, 와인전문가들은 알코올 함량이 적은 당을 첨가하지 않은 와인을 더 선호하는 것으로 확인되었다. 본 연구 결과와 같이 파인애플로 제조한 와인이 가당을 하지 않고서도 과실주로서의 가능성에 대해 긍정적인 평가를 내릴 수 있었다. 이처럼, 건강에도 도움을 주고, 풍미도 좋으며, 알코올 농도가 높지 않은 와인을 제조할 수있으며, 다양한 소비층의 소비를 유도할 수 있을 것으로 판단된다. The effect of various sugar additives on physico-chemical characteristics and sensory qualities of pineapple wine was investigated. For the wine fermentation, pineapple juices containing different sugars (sucrose, glucose, fructose, and corn syrup) were used. The results showed that the fermentation characteristics of the pineapple juice depended on the sugar additives. In the case of sucrose, glucose, fructose, and corn syrup additions, the fermentations were extended to 5-15 days compared to the control sample (2 days). The glucose added to wine fermentation showed the highest alcohol concentration (12.8%). When the residual sugars were measured after the fermentations, fructose was observed as a major residual sugar in all fermentations. Particularly, the highest concentration of citric acid (0.335 mg/mL) and malic acid (0.127 mg/mL) was monitored in sucrose added to wine fermentation. Average concentrations of the phenolic compounds and the antioxidant activity (DPPH radical scavenging concentration) in the pineapple wines were 950 and 4,900 mg/L, respectively. The sensory analysis of the wines showed that the additions of the different sugars produced different preferences in both the expert and layman examining groups.
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단안 분지망막정맥폐쇄 환자의 무증상 반대안에서 안구관류압의 일중변동
박창현,박혜영,윤재윤,박찬기,Chang Hyun Park,Hae Young Park,Jae Yoon Yoon,Chan Kee Park 대한안과학회 2014 대한안과학회지 Vol.55 No.2
Purpose: To investigate diurnal change in blood pressure (BP), intraocular pressure (IOP), and ocular perfusion pressure (OPP) in patients with unilateral branch retinal vein occlusion (BRVO) and compare the results with healthy controls. Methods: We conducted a prospective case‐control study which included 50 patients with unilateral BRVO and 50 agematched volunteers as controls. Each participant underwent a comprehensive ophthalmic examination including optical coherence tomography (OCT). BP and IOP were evaluated 4 times daily at 8 AM, 10 AM, 2 PM and 6 PM. The mean and fluctuation of BP, IOP, mean arterial pressure (MAP), mean OPP (MOPP), and diastolic OPP (DOPP) were compared between fellow eyes of BRVO patients and normal control eyes. Results: The average retinal nerve fiber layer (RNFL) thickness was significantly reduced in the fellow eyes of BRVO patients compared to control eyes (p < 0.001). Mean IOP and IOP fluctuation did not differ, but BP fluctuation (systolic BP fluctuation, p = 0.045; diastolic BP fluctuation, p = 0.037) and MAP fluctuation (p = 0.011) were greater in the fellow eyes of BRVO patients compared to normal eyes. The mean MOPP and DOPP did not differ between groups, however, the fluctuation of MOPP (p < 0.001) and DOPP (p < 0.001) were significantly increased in the fellow eyes of BRVO patients. The mean and fluctuation of BP, MAP, MOPP and DOPP were associated with reduced average RNFL thickness in the fellow eyes of BRVO patients. Conclusions: These results suggest the fellow eyes of unilateral BRVO patients may be at risk of developing glaucomatous damage. J Korean Ophthalmol Soc 2014;55(2):237-246
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