• 대한물리치료과학회지
• /
• 제19권3호
• /
• pp.31-38
• /
• 2012

Background : The purpose of this study was to evaluate the effect of the kinesio taping on the forward head posture and to reduce secondary pain and attitude transformation by applying kinesio taping. Methods : The subjects were the C university students(n = 30) in Chung-buk district without medical history. They were divided into two groups:experimental group(N = 15) and control group(N = 15). Control group was heard verbal instructions to keep right attitude and Experimental group was applied to kinesio taping. Change of an attitude, such as an angle, distance, CROM, CVA, CRA prices, before and after experiment was measured respectively. Result : The results of this study showed that in comparison of pre and post changes, experimental group noticeable changes in angle, CROMSI and CVA(p<.05). Angle, CROMSI and CVA were significant differed between groups(p<.05). Conclusion : Kinesio taping application was seemed to be effective on the improvement of forward head position. Therefore, it is suggested that Kinesio taping application should be one the potential methods to facillitate the forward head position. Comprehensive research is required about a point of time and duration for intervention in clinical approach for subjects.

• The Journal of Asian Finance, Economics and Business
• /
• 제8권2호
• /
• pp.923-931
• /
• 2021

The aim of the present study is to analyze the financial performance of converted commercial bank from non-banking financial institution through a case study of Bangladesh Commerce Bank Limited as sample organization. It is observed that the bank is able to achieve a stable growth rate in total deposits, total loans and advances, and net income after tax during the period of 2015-2019. Researchers also calculated some ratio analysis and noticed that the financial position of Bangladesh Commerce Bank Limited was not so strong because bank's ROA, ROE, NIM and other ratios were below standard. Researchers used secondary data that were examined by using descriptive statistical tools and panel data regression model. Result shows that Bangladesh Commerce Bank has satisfactory operating efficiency, assets management efficiency, and gives loans to customers. In addition, the present study has tested some hypotheses regarding net income after tax, ROA and ROE with total assets, total loans, total deposits and interest income. These hypotheses have been accepted, which means there is no significant influence of the independent variable on the dependent variable. The study suggests that Bangladesh Commerce Bank Limited had the opportunities to make their financial position stronger by utilizing their good financial position and management efficiencies.

• 한국컴퓨터정보학회논문지
• /
• 제29권7호
• /
• pp.231-243
• /
• 2024

생성형 AI 서비스의 다각화로 다양한 분야와 연령대에서 사용됨에 따라, 교육 분야에서도 활용 시도와 논의가 활발해지고 있다. 본 연구에서는 충청북도 지역 초·중등 교직원 934명 대상의 설문 조사를 통해 생성형 AI에 대한 일반적 및 업무 영역에서의 인식과 활용도, 요구 사항을 조사·분석했다. 주요 연구 결과로, 첫째, 교직원의 생성형 AI 활용 경험은 일반적 사용 대비 업무 목적 사용 경험이 적었고, 월 1회 이상의 주기적 빈도를 고려하면 훨씬 적은 비율로 나타났다. 둘째, 생성형 AI의 업무 활용 시 업무 효율 향상에 대한 기대가 가장 높은 것으로 나타났다. 셋째, 직위와 직종에 따라 생성형 AI의 활용 방안별 유용성 인식차가 두드러졌지만, 다양한 문서 처리 도움에 대한 유용성 인식 정도가 공통으로 높은 것으로 나타났다. 초·중등 교직원의 생성형 AI 업무 활용을 위해 생성형 AI 사용 관련 부작용 및 유의점에 대한 안전장치 마련과 촉진 환경 조성 등의 사항에 대한 개선이 필요하고 직위와 직종에 따라 요구 사항과 필요성이 고려되어야 할 것이다.

• Journal of Microbiology and Biotechnology
• /
• 제25권10호
• /
• pp.1634-1639
• /
• 2015

Cytochrome P450 hydroxylase (CYP) in actinomycetes plays an important role in the biosynthesis and bioconversion of various secondary metabolites. Two unique CYPs named CYP-sb21 and CYP-pa1, which were identified from Sebekia benihana and Pseudonocardia autotrophica, respectively, were proven to transfer a hydroxyl group at the 4^th or 9^th N-methyl leucine position of immunosuppressive agent cyclosporin A (CsA). Interestingly, these two homologous CYPs showed different CsA regio-selectivities. CYP-sb21 exhibited preferential hydroxylation activity at the 4^th position over the 9^th position, whereas CYP-pa1 showed the opposite preference. To narrow down the CYP domain critical for CsA regio-selectivity, each CYP was divided into four domains, and each domain was swapped with its counterpart from the other CYP. A total of 18 hybrid CYPs were then individually tested for CsA regio-selectivity. Although most of the hybrid CYPs failed to exhibit a significant change in regio-selectivity in the context of CsA hydroxylation, hybrid CYP-pa1 swapped with the second domain of CYP-sb21 showed a higher preference for the 9^th position. Moreover, hybrid CYPsb21 containing seven amino acids from the 2nd domain of CYP-pa1 showed higher preference for the 4^th position. These results imply that the 2nd domain of CsA-specific CYP plays a critical role in CsA regio-selectivity, thereby setting the stage for biotechnological application of CsA regio-selective hydroxylation.

• Journal of Biosystems Engineering
• /
• 제29권1호
• /
• pp.9-20
• /
• 2004

On the basis of design theory of soil inversion, two types of moldboard plow with secondary soil mover was designed and constructed to invert furrow slice at same position with furrow bottom. A series of soil bin experiment was carried to investigate the performance of prototypes. First prototype of new concept plow showed two kinds of problems during the preliminary experiment. For the plowing depth of 6cut the prototype did not invert the furrow slice, instead it just cut furrow bottom and the furrow slice returned to the original position. For the plowing depth of 8cm, there was soil clogging problem at the rear part of plow. From the above results it was concluded that the first prototype can not be used for the inversion of furrow slice at same position with furrow bottom. Second prototype could invert furrow slice at the same position with furrow bottom, but the performance was affected by soil moisture content soil hardness and plowing speed very much. For the higher soil moisture content, for the higher soil hardness and higher plowing speed, the prototype showed higher soil inversion performance. For the second prototype the inversion ratio was almost 100%, inversion angle was in the range of 90 to 100 degree and side displacement was less than 4 cm. But the furrow slice was not continuous, it was cut in the length of 30 to 40 cm. The reason why the furrow slice was cut in that length is blamed for the design of moldboard surface. The specific draft of prototype was in the range of 37.24 kN/㎡ to 42.14 kN/㎡ this value is a little higher than that of the conventional plow, or from 30.38 kN/㎡ to 33.32 kN/㎡. But the difference was not so big. The inversion performance of the second prototype for the field experiment was much better than that of soil bin experiment due to the better soil and operational conditions. Sticky and compacted soil conditions, and higher plowing speed was suitable for the plowing operation of the second prototype

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2007년도 추계학술대회 논문집
• /
• pp.156-160
• /
• 2007

Ejector system is a device to transport a low-pressure secondary flow by using a high-pressure primary flow. Ejector system is, in general, composed of a primary nozzle, a mixing section, a casing part for suction of secondary flow and a diffuser. It can induce the secondary flow or affect the secondary chamber pressure by both shear stress and pressure drop which are generated in the primary jet boundary. Ejector system is simple in construction and has no moving parts, so it can not only compress and transport a massive capacity of fluid without trouble, but also has little need for maintenance. Ejectors are widely used in a range of applications such as a turbine-based combined-cycle propulsion system and a high altitude test facility for rocket engine, pressure recovery system, desalination plant and ejector ramjet etc. The primary interest of this study is to set up an applicable model and operating conditions for an ejector in the condition of sonic and subsonic, which can be extended to the hydrogen fuel cell vehicle. Experimental and theoretical investigation on the sonic and subsonic ejectors with a converging-diverging diffuser was carried out. Optimization technique and numerical simulation was adopted for an optimal geometry design and satisfying the required performance at design point of ejector for hydrogen recirculation. Also, some sonic and subsonic ejectors with the function of changing nozzle position were manufactured precisely and tested for the comparison with the calculation results.

• 대한기계학회논문집B
• /
• 제25권11호
• /
• pp.1640-1649
• /
• 2001

The present study investigates the effects of various rib arrangements on heat/mass transfer in the cooling passage of gas turbine blades. A complex flow structure occurs in the cooling passage with rib turbulators which promote heat transfer on the wall. It is important to increase not only the heat transfer rates but also the uniformity of heat transfer in the cooling passage. A numerical computation is performed using a commercial code to calculate the flow structures and experiments are conducted to measure heat/mass transfer coefficients using a naphthalene sublimation technique. A square channel (50 mm $\times$ 50 mm) with rectangular ribs (4 mm $\times$ 5 mm) is used fur the stationary duct test. The experiments focus on the effects of rib arrangements and gap positions in the discrete ribs on the heat/mass transfer on the duct wall. The rib angle of attack is 60°and the rib-to-rib pitch is 32 mm, that is 8 times of the rib height. With the inclined rib angle of attack (60°), the parallel rib arrangements make a pair of counter rotating secondary flows in the cross section, but the cross rib arrangements make a single large secondary flow including a small secondary vortex. These secondary flow patterns affect significantly the heat/mass transfer on the ribbed wall. The heat/mass transfer in the parallel arrangements is 1.5 ∼2 times higher than that in the cross arrangements. However, the shifted rib arrangements change little the heat/mass transfer from the inline rib arrangements. The gap position in the discrete rib affects significantly the heat/mass transfer because a strong flow acceleration occurs locally through the gap.

• 한국광학회지
• /
• 제25권2호
• /
• pp.78-84
• /
• 2014

본 논문에서는 직경이 14.5 mm인 대면적 COB-type LED 패키지를 사용하면서도 15도 이내의 좁은 광속각을 구현하기 위해, 광학계 크기를 축소하고 동시에 satellite ring 발생을 억제할 수 있는 이중 반사경 구조를 고안하여 조명광학계용 2차 광학계를 최적 설계하였다. 최적 설계를 위해 광원 크기와 제 1 반사경의 광속각 관계를 이용하였고, satellite ring 발생을 억제하기 위한 제 2 반사경의 최적 위치 및 크기를 고려하였다. 그 결과 대체 상용 제품의 크기 제한을 만족하며 80%의 광속 효율을 달성할 수 있었다.

• 한국산학기술학회논문지
• /
• 제19권9호
• /
• pp.69-76
• /
• 2018

본 연구에서는 가스터빈 블레이드의 필름 냉각에서 45도 리브가 있는 냉각채널의 필름 홀 위치가 블레이드의 표면냉각 성능에 미치는 영향을 전산유체해석 기법을 통하여 분석하였다. 또한 냉각채널의 리브 유무의 영향을 동일 분사율에 대해서 고찰하였다. 수치해석 도메인은 3차원으로 구성하였고 상용코드(Fluent ver. 17.0)를 사용하여 정상상태 조건 하에서 수치해석을 진행하였다. 그 결과를 바탕으로 블레이드 표면에서의 냉각효율, 유속, 유선, 압력 계수를 비교 분석하였고 홀 위치의 변화가 리브 구조에 의해 유발되는 이차 유동의 토출에 미치는 영향을 고찰하였다. 수치해석 결과로부터 리브가 설치되어 있는 경우 냉각채널의 내부유동은 상부에서 반시계 방향 및 하부에서 시계 방향의 와류쌍을 형성하는 것을 확인할 수 있었다. 리브가 있는 채널의 경우 리브에 의하여 발생한 와류유동이 홀 출구 부근에서 더 높은 압력 차이를 유발하여 리브가 없는 경우보다 최소 12% 이상의 높은 냉각 효율을 나타냈다. 또한 리브가 있는 채널 중에서 홀이 좌측에 위치한 경우(Rib-Left) 리브에 의하여 발생한 이차 유동이 홀 부근의 벽면에 부딪혀 홀 경사각 방향으로의 유동이 형성되는 것을 확인하였다. 블레이드 표면으로 토출된 냉각기체가 주 유동 경계층 내부에서 머무는 영역이 다른 케이스에 비하여 넓기 때문인 것으로 사료된다. 또한 이 경우 홀 출구 부근에서 가장 큰 압력 계수 차이를 나타내었고 이로 인하여 냉각기체의 토출이 촉진되어 냉각효율이 다소 증가하였다.

• Nuclear Engineering and Technology
• /
• 제47권5호
• /
• pp.523-533
• /
• 2015

Three-dimensional flow phenomena in a wire-wrapped 37-pin fuel assembly mock-up of a Japanese loop-type sodium-cooled fast reactor, Monju, were investigated with a numerical analysis using a general-purpose commercial computational fluid dynamics code, CFX. Complicated and vortical flow phenomena in the wire-wrapped 37-pin fuel assembly were captured by a Reynolds-averaged Navier-Stokes flow simulation using a shear stress transport turbulence model. The main purpose of the current study is to understand the three-dimensional complex flow phenomena in a wire-wrapped fuel assembly to support the license issue for the core design. Computational fluid dynamics results show good agreement with friction factor correlation models. The secondary flow in the corner and edge subchannels is much stronger than that in an interior subchannel. The axial velocity averaged in the corner and edge subchannels is higher than that averaged in the interior subchannels. Three-dimensional multiscale vortex structures start to be formed by an interaction between secondary flows around each wire-wrapped pin. Behavior of the large-scale vortex structures in the corner and edge subchannels is closely related to the relative position between the hexagonal duct wall and the helically wrapped wire spacer. The small-scale vortex is axially developed in the interior subchannels. Furthermore, a driving force on each wire spacer surface is closely related to the relative position between the hexagonal duct wall and the wire spacer.