• 한국초등과학교육학회지:초등과학교육
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• 제20권1호
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• pp.91-105
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• 2001

이 연구에서는 물의 상태와 상태 변화를 중심으로 유치원, 초등, 중등 과학 교재의 탐구능력 전개 과정의 연계성을 고찰해 보고자 하였다. 이를 위하여 유치원 제 5차 교육과정 교재들과 제 6차 교육과정에 근거한 초등학교 자연 고과서와 중학교 과학 교과서를 분석하였다. 분석 결과, 유아, 초등, 중등 과학 교육과정의 연계성 측면에서 볼 때, 모든 학년에서 예상, 분류, 가설설정, 실험 설계 등의 탐구능력이 부족한 것으로 나타났다. 또한 측정 능력은 이론적으로 초등학교 저학년부터 가질 수 있음에도 불구하고, 고학년 이상에서만 제시되었다.

• 한국레이저가공학회지
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• 제13권4호
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• pp.1-6
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• 2010

Recently the use of ultra high strength steels (UHSS) in structural and safety component is rapidly increasing in the automotive industry. For example, 1.5GPa grade hot stamping with die-quenching of boron steel 22MnB5 could apply crash-resistant parts such as bumpers and pillars. The development of laser welding process of hot stamping steels, fundamental bead-on-plate welding and lap joint welding test were carried out using 3kW Nd:YAG laser. Local hardening & HAZ softening occurred in hot stamping steel as a result of metallurgical change caused by the welding heat input in the Nd:YAG laser welding process. The size of soft zones in the hot stamping steel was related to the welding heat input, being smaller at high speeds which generated a smaller heat input. Also in the case of lap joint design structure, same welded characteristics were shown. The HAZ softening degree was controlled to ensure the joint strength.

• 한국항공운항학회지
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• 제18권1호
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• pp.83-88
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• 2010

The study is intended to help to select the pilot candidates with exceptional flight aptitude ability and to investigate the relationship between the results of the scholastic aptitude test and the flight aptitude. It is intended that the research will help to draw recommendations on the relevant fields of the scholastic aptitude test that is to be used to select the high caliber candidates with exceptional flight aptitude ability, to gauge the resulting effectiveness of its application and helping to revise the university's syllabus accordingly. From the study, korean, mathematics, english grade and the flight aptitude test results have all shown to hold mutual relationship and through simple correlation analysis, it was discovered that mathematics and English are the two factors that affect the results of the flight aptitude test, with the extent of its impact graded in descending order of English, mathematics and Korean. Lastly, the logistic regression analysis have discovered that the mathematics grade has significant effect on the classification of the flight aptitude and non aptitude category groups, and English also has significant influence close to the 0.05 p-values. It is believed that should the findings of this study be considered as part of the selection process of the university applicants of the department of aeronautical science, making discovery of candidates of higher quality is expected.

• Journal of information and communication convergence engineering
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• 제8권1호
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• pp.51-58
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• 2010

This paper proposes an edge adaptive color interpolation for an ultra-small HD-grade complementary metal-oxide semiconductor (CMOS) video sensor in camera phones that can process 720-p/30-fps videos. Recently, proposed methods with great image quality perceptually reconstruct the green component and then estimate the red/blue component using the reconstructed green and neighbor red and blue pixels. However, these methods require the bulky memory line buffers in order to temporally store the reconstructed green components. The edge adaptive color interpolation method uses seven or nine patterns to calculate the six edge directions. At the same time, the threshold values are adaptively adjusted by the sum of the color values of the selected pixels. This method selects the suitable one among the patterns using two flowcharts proposed in this paper, and then interpolates the missing color values. For verification, we calculated the peak-signal-to-noise-ratio (PSNR) in the test images, which were processed by the proposed algorithm, and compared the calculated PSNR of the existing methods. The proposed color interpolation is also fabricated with the 0.18-${\mu}m$ CMOS flash memory process.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.342-348
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• 2001

This study was conducted to obtain granular crystalline gypsum that can be used as raw material for plaster boards or cements from waste Plaster board. We could disintegrate preferentially gypsum to gypsum needle in 10${\mu}{\textrm}{m}$ or less size among the contents of waste plaster board (gypsum, paper, fiber, and inorganic material .etc.) by hydration afterwards the dehydration of crushed waste plaster board. In this case, the optimum conditions for minimizing the size of gypsum were dehydration rate of 75%~ 85%, hydration concentration of 10~20%, agitation speed of 250~400rpm, crushing size of 2cm or less. Gypsum of 98.21% grade was recovered with 99.0% yield from under screenings of 325mesh wet screening which followed by the dehydration-hydration process performed in the conditions of dehydration rate of 80%, hydration concentration of 15%, agitation speed of 300rpm, crushing size of 2cm or less. Subsequently, Plate-like Crystalline gypsum of is 151${\mu}{\textrm}{m}$ size and the grade of 99.49% with the Yield of 98.0% from the upper screenings of 270mesh wet screening carried out after the re-crystallization of the recovered gypsum needle slurry.

• 한국병원경영학회지
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• 제12권1호
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• pp.100-127
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• 2007

The purpose of this study is to reform the productive industrial relations in hospital. Because the industrial relations of hospital is antagonistic each other and this problem cause a low productivity. In Korea, hospitals maintain their ownership structure, strategy is controlled by government, short process of management, and culture of grade. The executive of hospital doesn't gain the confidence of union. This circumstances is related with the antagonistic industrial relations. This research is to analyze hospital management system through experiential and literature study, and is to present a reform strategies for cooperative industrial relations of improving productivity in hospital. As a results, if the hospital manager hopes to improve productivity, they should introduce expert management system rather than ownership and management system. And it is need to execute the hospital initiative strategy rather than to depend on the government. Moreover, the hospital can achieve productive industrial relations as a middle-long term visions in management process and horizontal organization culture. Although this study is limited by literature research, it will contribute to settle productive industrial relations in hospital and to accomplish the additional study.

• 자원리싸이클링
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• 제10권6호
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• pp.43-52
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• 2001

This study was conducted to obtain granular crystalline gypsum that can be used as raw material for Plaster boards or cements from waste Plaster board. Gypsum could be Preferentially disintegrated to gypsum needle in $10\mu\textrm{m}$ or less size by hydration after the dehydration of crushed waste Plaster board. The finer the gypsum needle, it is easier to remove coarse impurities and to recover the gypsum needle. The optimum conditions for obtain the finer gypsum size were dehydration rate of 75~85%, solid concentration at hydration of 10~15%, agitation speed of 250~400 rpm, crushing size before dehydration of 2 cm or less. Gypsum of 98.21% grade was recovered with 99.0% yield as the undersize of 325 mesh wet screening followed by the dehydration-hydration process performed at the conditions of dehydration rate of 80%, solid concentration at hydration of 15%, agitation speed of 300 rpm, crushing size before dehydration of 2 cm or less. After the recrystallization of recovered gypsum, Plate-like gypsum of $151\mu\textrm{m}$ size with 99.49% grade was obtained as the oversize of 270 mesh in a wet screening.

• 한국초등과학교육학회지:초등과학교육
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• 제26권5호
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• pp.525-534
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• 2007

Elementary students are tend to depend heavily on visual informations in the cognitive process. Thus, elementary science textbooks provide science contents mostly by inscriptions, the visual materials, with little verbal information in the limited page area. Especially, since the textbooks include many accompanying inscriptions rather than a basic inscription, it is very important to understand the relationships among many inscriptions in teaching and leaning science. Therefore, this study analyzed the status and characteristics of accompanying inscriptions used. in elementary science textbooks, and classified them according to their functions. As results, we found six types of the accompanying inscriptions such as inner part, detail, result, process, emphasis, and explanation. Accompanying inscriptions were used more frequently in the lower grade (3rd and 4th grades) than the higher grade (5th and 6th grades). We discussed the examples of each type in detail, and thus revealed some possible difficulties in understanding inscriptions caused by the inconsistency of the directions of the basic inscription and accompanying inscription, and by the absence of the sign linking the basic and accompanying inscriptions.

• 한국기계가공학회지
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• 제16권6호
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• pp.95-100
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• 2017

Recently, biomedical-grade texture material gauze has often been used to treat wounds. At this time, it is difficult to remove scratches and pushed gauze; if you remove it with force, the tissue may separate and bleeding may occur again. In this study, we studied a method to apply medical-grade silicone material. Similar to the research result that hypertrophic wounds reduce the thickness of scar marks. Through mini-pig experiments, we evaluated the effects on scar treatment. The test results showed that the silicone cover layer applied to the wound site had a sealing effect on the wound area, skin temperature, and histopathological examination. In conclusion, gel treatment utilizing a biocompatible substance had the effect of minimizing hypertrophic scars.

• 한국정밀공학회지
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• 제21권7호
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• pp.136-144
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• 2004

Optimal process and system to produce the laser welded tube for one body formed bumper beam are studied. The calculated size of tube is a thickness of 1.4mm, diameter of 105.4mm and length of 2000mm. The tube is shaped from a cold rolled high strength steel sheet(tensile strength: 60kgf/$\textrm{mm}^2$ grade). Two roll bending method is the optimal tube shaping process compared to UO-bending, bending on press brake, multi-step continuous roll forming and 3 roll bending methods. Weld quality monitoring and seam tracking along the butt-joint lengthwise to the tube axis are also studied. The longitudinal butt-joint is welded by the $CO_2$ laser welding system equipped with a seam tracker and plasma sensor. The constructed $CO_2$laser tube welding system can be used for the precision seam tracking and the real-time monitoring of weld quality. Finally, the obtained laser welded tube can be used for one-body formed automobile bumper beam.