http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
축소확대 노즐에 의한 2유체 미립화의 유동가시화 및 분무특성
박병규,이준식,Park, Byeong-Gyu,Lee, Jun-Sik 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.8
Present study visualized flow pattern and investigated spray characteristics of twin-fluid atomization with converging-diverging nozzles. Particle sizes were measured by using the Malvern particle analyzer, and the radial size distributions were evaluated by using the tomographic transform technique. The results show that the SMD generally increases in the radial direction at a prescribed liquid flow rate and the increasing rate in the SMD becomes gradual as atomizing gas pressure increases. The SMD decreases as the liquid flow rate increases at a fixed GLR (gas/liquid mass ratio). The atomization performance of the protrusion-type nozzle turned out to be superior to that of the flush-type. However, in the case of the protrusion-type, flow separation occurs outside the liquid delivery tube when the pressure at the gas nozzle chamber is high enough, which may deteriorate the atomization performance.
박병규,김근오,Park, Byeong-Gyu,Kim, Geun-O 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.2
It has been investigated for the temperature profile in a planar evaporator of micro-cooler subject to a uniform heat flux prior to tole initiation of boiling. The results of the analysis allow for the determination of applied power levels fur which nucleation is likely to occur only within the vapor grooves of the evaporator while maintaining subcooling in the liquid core, thereby increasing the likelihood of a successful startup. Also, limits are fecund for which additional increases in the applied heat flux do not increase the temperature difference between the vapor grooves and the wick-liquid core interface. This analysis is appropriate for the microscale evaporators of micro-cooler during a fully-flooded startup as well as starter pump designs and micro-CPLs(capillary pumped loops). The results are useful in the initial basic design of microscale heat transfer devices.
박병규,이준식,Park, Byeong-Gyu,Lee, Jun-Sik 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.1
Spray characteristics of external mixing sonic twin-fluid atomization nozzles are investigated experimentally. Particle sizes are measured by the Fraunhofer diffraction method using the Malvern particle analyzer, and their radial distributions are obtained using the tomographical transformation technique. The spatial distribution of SMD shows that the drop size increases in the radial direction at a fixed liquid flow rate, and the distribution is getting uniform rapidly as the atomizing gas pressure increases. The SMD decreases as the liquid flow rate increases at a fixed GLR. It is found that the atomization efficiency of the flush type sonic nozzle is superior to that of protrusion type. The effect of laser beam diameter of the particle analyzer on the spatial SMD distribution is minor at present experimental conditions.
박병규,이준식,Park, Byeong-Gyu,Lee, Jun-Sik 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.7
Twin-fluid atomization has been widely used in combustors and process industries because of its high performance and simple structure. Flow visualization and pressure measurements were conducted to investigate the effects of gas flow in twin-fluid atomization. Schlieren photographs showed that changes in atomizing gas pressure, altered the wave patterns, and the lengths of both recitrculating toroid (impinging stangnation point) nad supersonic flow region in the jet. A longer supersonic wave pattern like net-shape wqas observed as atomizing gas pressure increased. The disintegration phenomenon of liquid delivery tube. The variation of spray angles with gas pressures were obtained by visualization using laser sheet beam. Suction pressuresat the nozzle orifice exit and recirculating region are shown to be used to estimate the stable atomization condition of a twin-fluid atomizer. 공정산업분야 및 분무연소분야에서 많이 사용되고 있는 2유체 분무기에서 출구 초음속유동의 가시화와 하류의 가스압력 측정 결과로부터 다음과 같은 결론을 얻었다. 1) 과소팽창 또는 과대팽창 초음속노즐 유동에서 출구 Mach수가 일정한 경우, 유동이 박리하지 않는다면 가스의 정체압력(유량)이 증가함에 따라 노즐출구에서 충돌정체점까지의 길이와 초음속 유동영역의 길이는 증가한다. 2) 스피팅 현상은 액체공급관 출구의 흡인압력은 분사가스압력이 증가함에 따라 단조증가하지만 분사가스압력이 0.5MPa이상이 되면 증감현상이 커지며 돌출형 노즐에서 유동박리시 급격히 증가한 다음 거의 일정하게 유지된다. 4) 액체공급관 하류축상의 압력변화는 출구의 음압에서 충돌정체점까지 상승한 다음 급강하하고 충격파 세포상의 구조에 따라 진동하면서 대기압에 도달한다.
위선종에서 mitotic spindle checkpoint 조절유전자인 hsMAD2의 돌연변이
박병규 ( Park Byeong Gyu ),박경화 ( Park Gyeong Hwa ),김한수 ( Kim Han Su ),송시영 ( Song Si Yeong ),홍성필 ( Hong Seong Pil ),박승우 ( Park Seung U ),정재복 ( Jeong Jae Bog ),강진경 ( Kang Jin Gyeong ) 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<목적> Mitosis 과정에서 염색체 분리는 spindle checkpoint에 의해 조절을 받으며, spindle checkpoint에 결함이 있을시에 aneuploidy가 발생하여 발암과정과 연관된다고 알려져 있다. hsMAD2는 spindle checkpoint를 조절하는 중요한 유전자로 본 연자등은 위암에서 빈번한 돌연변이 및 hot spot을 보고한 바 있으며, hsMAD2돌연변이에 의한 염색체 불안정성과 위암 발생과의 연관성을 제시한 바 있
박병규 ( Byeong-gyu Park ),강정희 ( Jeong-hee Kang ) 대한미용문화예술학회 2017 대한미용문화예술학회지 Vol.6 No.2
The purpose of this study was to evaluate the characteristics of sparkling water in hair during dyeing using sparkling water. C of hair thickness was 0.023 ± 0.003 ㎜ YS was 0.025 ± 0.002 mm and increased by 8.44% when compared to C. As a result of measuring the moisture content of feet, the health test showed 84.77%.C was 65.67% YS was 71.10% and increased by 0.84% when compared with C. The morphological characteristics of the hair surface were found to be consistent with that of YS, but with a constant cuticle spacing and stable morphology compared to C. YS was found to be 410.81 ± 0.72 ㎚ and increased by 6.81% when compared to C. As a result, it was confirmed that the treatment with sparkling water during hair dyeing showed low hair damage, and the hair protection effect was more excellent. Therefore, it is suggested that the results of this study should be used as a method to minimize the hair damage that may occur during the dyeing procedure, and further developed research methods should be proposed based on this. The limitation of this study is that it is difficult to standardize all the hair because one person's hair was taken and tested, and it is considered that the result of this experiment may be different because there are differences in ingredients depending on the source of sparkling water.
열 펌 시술 시 렌틸콩 추출물의 적용량과 적용시점에 따른 모발보호효과
박병규(Byeong Gyu Park),전홍신(Hong Shin Jeon),고경숙(Kyoung sook Ko) 한국인체미용예술학회 2017 한국인체미용예술학회지 Vol.18 No.3
This study attempted to investigate the hair-protection effects of Lens culinaris extract by the time and amount of its application during a heat perm through its great antioxidant activities. For this, testees were divided into two groups: P group (5%, 10% and 15% Lens culinaris extract added to the reducing agent) and J group (5%, 10% and 15% Lens culinaris extract added to the oxidant). Then, the following was analyzed with the hair: tensile strength, thickness, cuticle, components and ingredients. The results found the following: In terms of tensile strength, the P1 group was the highest with 153.19 ± 23.00, followed by the J1 group (124.80 ± 21.71). In hair thickness, the P2 group was 0.038 ± 0.009 mm while the J1 group showed results (0.040 ± 0.003mm) closest to healthy hair. In cuticle conditions, P1 showed 432.660 nm ± 12.283 while J1 was 427.880 ± 12.051 nm. In J1, some slight cuticle degradation and exfoliation were observed. Compared to the control group, however, J1 showed a relatively consistent cuticle and stable pattern. According to analysis of components, J1 was the highest with 9.17 Wt% while P1 was 9.13 Wt% in sulfur contents, which means that Lens culinaris extract makes up for sulfur. The said results prove that an addition of Lens culinaris extract during digital perms would reduce hair damage. In particular, the addition of 5% Lens culinaris extract to the oxidant appears to be more effective in hair protection.