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소수성 마이크로 패턴을 갖는 Stripe 코팅용 슬롯 다이 헤드 구조 최적화
유수호,이진영,박종운 한국반도체디스플레이기술학회 2019 반도체디스플레이기술학회지 Vol.18 No.2
In the presence of μ-tip for narrow stripe coating, there appears lateral capillary flow along the hydrophilic head lip because the μ-tip has some resistance to flow. It was known to be suppressed by increasing the contact angle of the head lip. In this paper, we have demonstrated by computational fluid dynamics(CFD) simulations that it can also be suppressed by the formation of micro-patterns on the shim and meniscus guide embedded into the slot-die head. To optimize the micro-patterned structure, we have performed simulations by varying the groove width, depth, and clearance. In the absence of micro-patterns, it is shown by experiment and simulation that the solution spreads to a distance of 1,300 μm from the μ-tip. In the presence of micro-patterns with the groove width and clearance of 50 μm, the distance the solution spreads is reduced to 260 μm. However, no further suppression in the capillary flow is observed with micro-patterns with the groove width of 40 μm or less. It is also observed that the capillary flow is not affected by the groove depth if it is larger than 10 μm. We have shown that the distance the solution spreads can be reduced further to 204 μm by coating a hydrophobic material (contact angle of 104º) on the surface of micro-patterns having the groove width and clearance of 50 μm.
Stripe 코팅용 슬롯 다이 헤드 모세관 유동 전산모사
유수호,이진영,박종운 한국반도체디스플레이기술학회 2019 반도체디스플레이기술학회지 Vol.18 No.1
In the presence of µ-tip embedded in a slot-die head for stripe coatings, there arises the capillary flow that limits an increase of the stripe density, which is required for the potential applications in organic light-emitting diode displays. With an attempt to suppress it, we have employed a computational fluid dynamics software and performed simulations by varying the µ-tip length and the contact angles of the head lip and µ-tip. We have first demonstrated that such a capillary flow phenomenon (a spread of solution along the head lip) observed experimentally can be reproduced by the computational fluid dynamics software. Through simulations, we have found that stronger capillary flow is observed in the hydrophilic head lip with a smaller contact angle and it is suppressed effectively as the contact angle increases. When the contact angle of the head lip increases from 16 º to 130 º, the distance a solution can reach decreases sharply from 256 µm to 44 µm. With increasing contact angle of the μ-tip, however, the solution flow along the μ-tip is disturbed and thus the capillary flow phenomenon becomes more severe. If the μ-tip is long, the capillary flow also appears strong due to an increase of flow resistance (electronic-hydraulic analogy). It can be suppressed by reducing the μ-tip length, but not as effectively as reducing the contact angle of the head lip.
대규모 임상검체를 이용한 ADVIA Centaur XP와 cobas e801 장비 간 전립성특이항원 비교평가
유수호,김상미,박형두 대한진단검사의학회 2023 Laboratory Medicine Online Vol.13 No.3
Background: Prostate-specific antigen (PSA) is the first-line test for screening prostate malignancy. However, PSA levels vary between measurement procedures (MPs). In this study, we evaluated the precision and linearity of cobas e801 (Roche Diagnostics, Germany) and evaluated the clinical impact based on the bias with ADVIA Centaur XP (Siemens Healthineers, USA) in subjects under medical checkup. Methods: This study followed the Clinical and Laboratory Standards Institute EP05-A3, EP06-A, and EP09c guidelines each for precision, linearity, and comparison. We evaluated simultaneously measured 5,373 patient samples and the health check examinee samples by Centaur XP (n=97,271) and cobas e801 (n=51,640). Results: The repeatability was 2.04%–2.68% and the within-laboratory precision was 1.34–1.57%. The best polynomial regression was the first order in the range of 0.06–99.70 ng/mL. The biases of lower and higher concentrations were -0.013 ng/mL (95% Confidence Interval (CI): -0.014 to -0.013) and 14.0% (95% CI: 13.9–14.1), respectively. Two MPs were correlated (y=-0.024+1.151x, R=0.952). However, the bias between the MPs (14.3%) was acceptable only with the minimum analytical performance specifications for bias (16.0%). The Cohen’s kappa was 0.933. The overall positive rate of PSA level (>3.0 ng/mL) was 3.93% (Centaur XP) and 5.41% (cobas e801). The positivity rate of the examinee in their sixties showed significant difference (Centaur XP 4.46% vs. cobas e801 7.27%, P<0.001), which was statistically comparable due to the similar age distribution. Conclusions: cobas e801 exhibited appropriate precision and linearity. Although the bias between two MPs was acceptable, there was diagnostic difference. Caution with clinical application of PSA levels would be required. 배경: 전립선특이항원(prostate specific antigen, PSA)은 전립선암의 선별검사로서 사용되고 있다. 하지만 PSA는 측정장비 사이에 큰 변동성을 보이는 것으로 알려져 있다. 본 연구에서는 cobas e801 (Roche Diagnostics, Germany; e801)에 의한 PSA의 정밀도, 직선성 및 Centaur XP (Siemens Healthineers, USA; Centaur XP)와의 PSA의 상관성을 평가하였고, 두 측정장비 간 바이어스에 의한 임상적 영향을 건강검진 수진자들의 PSA 양성률 변화를 통해 분석하였다. 방법: CLSI EP05-A3, EP06-A, EP09c 지침을 따라 e801로 측정한 PSA의 정밀도와 직선성, e801과 Centaur XP 간 상관성을 평가하였다. 두 장비에서 동시측정한 5,373건, Centaur XP로 측정한 97,271건(2016–2019년), e801로 측정한 51,640건(2020–2022년)의 PSA 결과를 비교 평가하였다. 결과: e801로 측정한 PSA의 반복정밀도는 2.04–2.68%, 검사실내정밀도는 1.34–1.57%였으며 0.06–99.70 ng/mL의 범위에서 최적의 다항식이 일차다항식이었다. 저농도(0.01–0.32 ng/mL)와 고농도(0.32–10,000 ng/mL)에서 두 측정장비 간 PSA 바이어스는 각각 -0.013 ng/mL (95% CI: -0.014 – -0.013), 14.0% (95% CI: 13.9–14.1)이었다. Passing-Bablok 회귀방정식은 y=-0.024+1.151x (R=0.952)이었다. 두 장비 간 바이어스는 14.3%로서 분석능 사양의 최소기준(16.0 %)을 만족하였으며, Cohen’s kappa 계수는 0.933이었다. 장비별 건강검진 수진자들의 PSA 양성률(cutoff: 3.0 ng/mL)은 3.93% (Centaur XP), 5.41% (e801)이었고 나이 분포의 유의한 차이가 없어 비교 평가가 가능했던 60대에서 유의한 PSA 양성률 차이를 보였다(Centaur XP 4.46% 대 e801 7.27%, P<0.001). 결론: e801에 의한 PSA는 적절한 정밀도, 직선성을 보였다. 두 측정장비 간 PSA의 바이어스는 허용가능한 범위 내 있었지만 장비 간 진단적 차이가 있었다. PSA 측정값의 임상 적용에 있어서 주의가 필요할 것이다.
혈청학적 RhD 음성 환자에서 RhD 양성 혈액제제 수혈에 관한 의견
유수호,정인화,조덕 대한수혈학회 2022 大韓輸血學會誌 Vol.33 No.3
Among RhD variants, it is considered safe to transfuse RhD positive blood to “Asia-type” DEL and weak D type 1, 2, and 3 recipients. However, transfusing RhD-positive blood cells in the “Asia-type” DEL, (serologically typed as RhD-negative), is still a cause for concern among clinicians. Here, the safety of transfusing RhD-positive blood components to “Asia-type” DEL recipients is re-emphasized by reviewing previously published literature. (Korean J Blood Transfus 2022;33:178-181)