• 한국지구과학회지
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• 제30권6호
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• pp.773-786
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• 2009

최근 들어 과학관과 학교 교육과정의 연계가 강조되고 있으나 과학관이 학교 교육과정을 어느 정도 반영하고 있는지를 가늠할 수 있는 기준은 부족한 실정이다. 이에 본 연구의 목적은 과학관의 교육과정 반영의 정도를 객관적으로 판단할수 있는 기준을 개발하고 이를 이용하여 과학관 패널 전시 설명문을 평가하는데 있다. 이를 위해 중등학교 성취기준에 따른 평가 도구를 개발하였으며, 이를 이용하여 충청도지역의 세 과학관에서 지구과학 패널 전시 설명문의 교육과정 반영도와 교육과정 도달 수준을 측정하였다. 연구 결과 과학관 지구과학 패널 전시 설명문의 교육과정 반영도는 38.7%로 측정되었으며, 교육과정 도달 수준은 5.0 만점에서2.82로 평가되었다. 차후 과학관 전시물의 패널 전시 설명문의 수준을 결정하는 과정에서 교육과정의 성취기준에 대한 교육과정 반영도와 도달 수준의 평가 결과가 활용될수있기를 기대한다.

• Advances in aircraft and spacecraft science
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• 제9권5호
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• pp.415-431
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• 2022

Secondary flows have a huge impact on losses generation in modern low pressure gas turbines (LPTs). At design point, the interaction of the blade profile with the end-wall boundary layer is responsible for up to 40% of total losses. Therefore, predicting accurately the end-wall flow field in a LPT is extremely important in the industrial design phase. Since the inlet boundary layer profile is one of the factors which most affects the evolution of secondary flows, the first main objective of the present work is to investigate the impact of two different inlet conditions on the end-wall flow field of the T106A, a well known LPT cascade. The first condition, labeled in the paper as C1, is represented by uniform conditions at the inlet plane and the second, C2, by a flow characterized by a defined inlet boundary layer profile. The code used for the simulations is based on the Discontinuous Galerkin (DG) formulation and solves the Reynolds-averaged Navier-Stokes (RANS) equations coupled with the Spalart Allmaras turbulence model. Secondly, this work aims at estimating the influence of viscosity and turbulence on the T106A end-wall flow field. In order to do so, RANS results are compared with those obtained from an inviscid simulation with a prescribed inlet total pressure profile, which mimics a boundary layer. A comparison between C1 and C2 results highlights an influence of secondary flows on the flow field up to a significant distance from the end-wall. In particular, the C2 end-wall flow field appears to be characterized by greater over turning and under turning angles and higher total pressure losses. Furthermore, the C2 simulated flow field shows good agreement with experimental and numerical data available in literature. The C2 and inviscid Euler computed flow fields, although globally comparable, present evident differences. The cascade passage simulated with inviscid flow is mainly dominated by a single large and homogeneous vortex structure, less stretched in the spanwise direction and closer to the end-wall than vortical structures computed by compressible flow simulation. It is reasonable, then, asserting that for the chosen test case a great part of the secondary flows details is strongly dependent on viscous phenomena and turbulence.

• 대한수학교육학회지:학교수학
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• 제17권2호
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• pp.331-353
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• 2015

본 연구의 목적은 수학교사의 평가 전문성 기준에서 평가도구의 개발과 관련된 세부 내용 중 평가문항 개발에 대한 역량을 탐색하는 것으로 중등학교 예비교사와 현직교사의 평가문항에 대한 자기인식의 차이는 어떠한지를 분석하였다. 평가문항 개발에 대한 자기인식 검사 도구는 수학 평가문항 개발에 대한 교사의 신념과 수학 평가문항 개발에 대한 교사의 자기평가로 구성되었다. 예비교사는 사범대학 재학생들을 대상으로, 현직교사는 중 고등학교에 재직교사를 대상으로 수학과 평가문항 개발에 대한 자기인식 검사를 실시하였다. 수학교사의 평가문항 개발에 대한 자기인식 검사를 위해 총 310명의 중등 예비교사와 현직교사의 응답결과를 분석하였다.

• International Journal of Aeronautical and Space Sciences
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• 제16권2호
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• pp.157-164
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• 2015

The present work performs three-dimensional flow calculations based on Reynolds Averaged Navier-Stokes (RANS) and Delayed Detached Eddy Simulation (DDES) to investigate the flow field of a transonic rotor (NASA Rotor 37) at near-stall condition. It is found that the DES approach is likely to predict well the complex flow characteristics such as secondary vortex or turbulent flow phenomenon than RANS approach, which is useful to describe the flow mechanism of a transonic compressor. Especially, the DES results show improvement of predicting the flow field in the wake region and the model captures reasonably well separated regions compared to the RANS model. Besides, it is discovered that the three-dimensional vortical flows after the vortex breakdown from the rotor tip region are widely distributed and its vortex structures are clearly present. Near the rotor leading edge, a part of the tip leakage flows in DES solution spill over into next passage of the blade owing to the separation vortex flow and the backflow is clearly seen around the trailing edge of rotor tip. Furthermore, the DES solution shows strong turbulent eddies especially in the rotor hub, rotor tip section and the downstream of rotor trailing edge compared to the RANS solution.

• 대한한방체열의학회지
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• 제2권1호
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• pp.1-5
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• 2003

Dysmenorrhea is one of the common gynecologic disorders of menstruation women. Primary dysmenorrhea is menstrual pain without pelvic pathology. whereas secondary one is painful mestruation with underlying pathology. The cause of primary dysmenorrhea is increased endometrial prostaglandin. The mechanisims underlying secondary dysmenorrhea are not eluciated. There are many blood vessels under the skin and they play a very important role in the thermal control of peripheral part. The control of blood circulation is mainly controlled by autonomic nervous system and it is known that D.I.T.I. (digital infra-red thermographic imaging) is an objective method showing the body temperature. I observed the abdominal themerature of 49 patients complaning of dysmenorrhea who visited the gynecologic department of Pundang Oriental Medical Hospital during 1997. In order to rule out thermal abnormality due to obesity. the causes whose obesity index were above I. were excluded in this study. The mean temperature of lower abdomen of the dysmenorrhea group was $35.22{\pm}1.33^{\circ}C$ and control group was $36.01{\pm}0.74^{\circ}C$.

• 한국전산유체공학회지
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• 제20권3호
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• pp.87-93
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• 2015

In this study, a numerical analysis was performed to simulate the thermal-hydraulic response of the secondary side of a steam generator(SG) model equipped with an orifice-type SG outlet flow restrictor to a main steam line break(MSLB) at a pressurized water reactor(PWR) plant. The SG analysis model includes the SG upper steam space and the part of the main steam pipe between the SG outlet and the broken pipe end. By comparing the numerical calculation results for the present SG model to those obtained for a simple SG model having no flow restrictor, the effects of the flow restrictor on the thermal-hydraulic response of SG to the MSLB were investigated.

• 영재교육연구
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• 제3_4권1호
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• pp.139-147
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• 1994

The "First Step to Nobel Prize in Physics" is an annual competition in research projects in physics for secondary (high) school pupils organized by the Institute od Physics, Polish Academy of Sciences. This year the second competition of that type has been completed. Pupils from 36 countries took part in the first two competitions, what certainly should be treated as a great success. We have organized the above competition for the following reasons. During our contacts with secondary school pupils we discovered that some of them try to perform different physical investigations by themselves: at schools, in some laboratories and even at home. Then we decided to organize the National Competition in Pupils' Research Projects in Physics and next - after gaining some experience in the national scale - the international competition "First Step to Nobel Prize in Physics". Our aim was to recognize the effort of the pupils, give them a chance to compare their own achievements with the achievements of their colleagues and organize their work. One should underline that the "First Step" refers to quite different features (long term research work) of the pupils than the International Physics Olympiad (solving well formulated physics problems). The prizes in our competition are not typical. Instead of buying some items for our winners we decided to invite them to our Institute for a research stay. In our opinion in case of people whose hobby is physics such a form of prize is more valuable and more instructive than anything else. The aim of this article is to discuss a genesis of the competition, to present conditions of participation and to discuss the results.

• 한국대기환경학회지
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• 제13권3호
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• pp.179-191
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• 1997

The concentrations of organic and elemental carbon were determined using fine particle samples collected from Kosan, Cheju Island during the summer seasons of 1994 and 1995. The daily mean concentrations of organic and elemental carbon for each measurement period were 3.74 and 0.27 $\mu\textrm{g}$/㎥ in 1994, while those of 1995 were 2.36 and 0.10 $\mu\textrm{g}$/㎥, respectively The concentrations of organic carbon were higher than those commonly observed from clean areas around the world, but those of elemental carbon were lower than, or comparable to, other clean areas in the world. The resulting ratios of total carbon to elemental carbon at this site were thus higher than those seen from other metropolitan and non-polluted regions abroad. In addition according to our analysis, the 1994 measurement period can be classified into two periods: enhanced (July 20 and August 1) and reduced levels (August 2 and 9) of the carbonaceous species. The observed difference between two periods may be in part accounted for by the air trajectories representing each period. During the former period, the air masses from the Asian continent and Japan were dominant, while the air masses from the North Pacific Ocean came during the latter period. OC/EC ratios at the site were calculated to predict the possible formation of secondary organic aerosol . Based on our observations, we suggest that the formation of secondary organic aerosol might be an important pathway to the production of organic carbons.

• Journal of the Korean Wood Science and Technology
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• 제9권1호
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• pp.1-12
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• 1981

The structure of spiral thickenings, particulary the appearance, arrangement and orientation of thickenings in compression wood of Torreya nucifera, were studied in detail by light and polarizing microscope, scanning and transmission electron microscope. The results obtained are as follows: (1) Using the inclined sections at an angle of 45 degrees to the fiber axis, it seems that we can not only observe the more accurate transverse view of the thickenings but also investigate the formation of their thickenings. (2) Generally 2-4 pieces of thickenings are projected to the cell lumen as nipple-like appearance in transverse section and are as frequent, well developed, forming pair and have the rope-like appearance in radial surface. (3) The secondary wall of early wood is composed of 3 layers (S1, S2, S3) and orientation of thickening appears S helix but that of late wood is of 2 layers (S1, S2) and that orientation shows Z helix. Above two regions are demaracted at several tracheid cells from the growth ring boundary. (4) Orientation of thickening seems to be a element showing the characteristics of compression wood in Torreya nucifera. (5) It believes that the thickenings of compression wood are integral part of the S3 in early wood tracheids and of the S2 in late wood and have the same orientations as the inner-most microfibrils in these layers. (6) Thickening and cavities seem to be not formed together in a secondary cell wall of same tracheids.

• 대한두개안면성형외과학회지
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• 제11권1호
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• pp.19-22
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• 2010

The author presents a new method for the formation of Cupid's bow and the vermilion tubercle by using the inferior-based lip skin flap in a secondary bilateral cleft lip deformity. The length of the flap includes the entire length of the previous upper lip scar. Both skin flaps are elevated and turned down toward the central part of the vermilion. The distant portion of the turned-down skin flaps are deepithelialized and trimmed according to the new shape of Cupid's bow. The deepithelialized portions of both flaps are buried under the central vermilion mucosa in order to create the vermilion tubercle. The advantages of the proposed procedure are; provision of a more natural shape of Cupid's bow, the lip length is increased, and the vermilion tubercle can be reconstructed at the same time. Therefore, this technique is best suited for a case of a bilateral absence of Cupid's bow combined with a short lip in a sufficient upper lip of a bilateral cleft lip deformity. The proposed procedure, however, should be avoided in the tight upper lip because of a great deal of tension on the donor.