• KSCE Journal of Civil and Environmental Engineering Research
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• v.36 no.2
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• pp.317-324
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• 2016

This paper is to provide information for quantitative evaluation of suspension bridge engineering and construction technology, technology development, and long-span bridge R&D agenda. Technology classification structure and key words are established and survey to identify technology level is performed. Then, competitiveness of patents and journal articles is evaluated for Korea, USA, Japan, Germany, France, and England. As a result, USA and Japan are generally competitive countries for all technology categories based on patents and journal articles. Korea is grouped in upper-middle class for overall technology level of suspension bridge. However, there are some variances among the level of technologies. This research results could be utilized as reference to establish future long-span bridge R&D. Also, it can be a standardized methodology to compare technology levels among countries.

• Journal of Elementary Mathematics Education in Korea
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• v.14 no.3
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• pp.701-722
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• 2010

Students have to investigate, experiment and inquire using the manipulative materials and real-world thing for studying Geometry. Manipulative materials activities encourage to understand mathematical concept and connection of symbol. Experiment activities using the computer focused the student's intuitive and inquisitive activities because of visualization of an abstract mathematics concept. This study developed a workbook through the use of manipulative materials and computer for operating and experimenting, and suggested a method for inquiry of geometrical properties and proved an effect. Manipulative materials-experiment activities was proven effective to middle level and lower level students in understanding the geometrical properties, and was proven effective to high level and lower level students when it comes to mathematical communication ability. When students operate, at first, they have to know about the feature and information of the materials, and the teacher has to make an elaborate plan and encourages the students to discuss about this.

• Journal of Engineering Education Research
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• v.12 no.3
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• pp.129-136
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• 2009

This paper is on the analysis of the present situation in carrying out homework assignments of the students in the college of Science and Technology, Hongik University. Our survey confirmed that the purpose of the assignments was not satisfactorily achieved, because only a few students solve the problems by their own efforts and most of the other students just copied their peers' work. The reason for this problem was analysed based on the result of questionnaire for the professors and students. Possible solutions for the problem is proposed, such as providing sufficient number of teaching assistants and changing instruction strategy, reflecting the significance of homework assignments in the learning process. As one of the probable solutions, a team-based assignment is proposed, and expected and observed positive results were discussed.

• Proceedings of the KAIS Fall Conference
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• 2011.12a
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• pp.163-165
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• 2011

본 연구에서는 해부학강의에 있어 혼합강의의 적용가능성을 평가하였다. 2007~2009년 매 1학기동안 강원대학교 의과대학 간호학과 학생(n=143)을 대상으로 해부학강의를 가상강의 9회, 면대면 강의 3회, 사체해부실습 2회로 구성된 혼합강의로 실시한 후 설문을 통해 자기평가요인(만족도, 난이도, 흥미도, 유용성, 평가의 적절성, 학업성취도, 운영의 적절성, 이론실습연계성), 학업성취별 자기평가요인, 자기평가요인간의 상관관계를 분석하였다. 자기평가요인의 난이도는 평균$2.96{\pm}0.63$점으로 전반적인 강의수준은 적절했던 것으로 나타났고 나머지 모든 요소들은 평균 3.82~4.21점 사이로 평가되어 간호학과에서 해부학강의를 위한 혼합강의의 적용이 매우 긍정적인 것으로 나타났다. 학기종료 후 화보한 최종성적을 기준으로 세 그룹(상위, 중위, 하위)으로 나누어 자기평가요인과의 관계를 분석한 결과, 모든 요소에서 통계적으로 유의하지 않았다(p>0.05). 자기평가요인 간의 상관관계는 난이도와 전공연계성의 유용성(r=0.300, p<0.0003),혼합강의의 유용성(r=0.210, p<0.0137), 평가의 적절성(r=0.323, p<0.0001), 이론실습연계성(r=0.216 0.0097)이 높을수록 상관성을 보였다, 만족도, 전공연계성의 유용성, 혼합강의의 유용성, 이론실습연계성에서는 학업성취도를 제외한 모든 요소에서, 흥미도는 난이도와 학업성취도를 제외한 모든 요소에서 유의성 있게 높은 상관성을 보였다. 하지만 학업성취도에서는 평가의 적절성을 제외한 다른 요소에서는 연관성을 보이지 않아 성적과 관련해 영향을 미치는 요소가 없다는 것으로 판단되어지며 본 연구를 위해 도입된 강의구성이 해부학의 균형 있는 학업성취를 유도할 수 있는 수업방식이라 판단되었다. 결론적으로 본 연구를 통해 해부학강의에 있어 혼합강의의 우수한 교육효과를 알 수 있었고, 간호학과만이 아닌 최근 급증하고 있는 의료-보건계열의 다양한 전공자를 위한 적용, 확대로 해부학지식의 질적 향상과 강의수요에 비해 부족한 해부학 전공 교수진들의 교육 부담을 경감할 수 있는 효과적인 교수법으로 활용가치가 있다고 사료된다.

• Journal of the Korea Convergence Society
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• v.9 no.11
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• pp.53-60
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• 2018

This paper describes the experiments of gaze tracking utilizing a low-cost electrooculogram measuring device. The goal of the experiments is to verify whether the low-cost device can be used for a complicated human-computer interaction tool, such as the eye-writing. Two experiments are conducted for this goal: a simple gaze tracking of four directional eye-movements, and eye-writing-which is to draw letters or shapes in a virtual space. Eye-written alphabets were obtained by two PSL-iEOGs and an Arduino Uno; they were classified by dynamic positional warping after preprocessed by a wavelet function. The results show that the expected recognition accuracy of the four-directional recognition is close to 90% when noises are controlled, and the similar median accuracy (90.00%) was achieved for the eye-writing when the number of writing patterns are limited to five. In future works, additional algorithms for stabilizing the signal need to be developed.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.6D
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• pp.895-904
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• 2008

CWR (Continuous Welded Rail) may be broken when a temperature drop below the neutral temperature changes in axial force, causing tensile fracture and rail gap, in winter. Rail-breaks may lead to the damage of the rail and wheel by dynamic load, and the reduction of running safety if not detected before the passage of a train. In this study, the track and train coupled model with open gap for dynamic interaction analysis, is proposed. Linear track and train systems is coupled by the nonlinear Herzian contact spring and the complete system matrices of total track-train system is constructed. And the interaction phenomenon considering open gap, was defined by assigning the irregularity functions between the two sides of a gap. Time history analysis, which have an iteration scheme such as $Newmark-{\beta}$ method based on Modified Newton-Raphson methods, was performed to solve the nonlinear equation. Finally, numerical studies are performed to assess the effect of various parameters of system, apply to various speeds, open gap size and the support stiffness of rail.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.108-108
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• 2022

기후변화는 전 지구 수문순환과 수자원 분포에 커다란 영향을 준다. 하지만 지금까지 관측되어온 지구상의 건조도 변화에 있어서 기후의 자연변동성의 영향과 인간활동에 의한 온난화의 영향을 명시적으로 밝힌 연구는 존재하지 않는다. 본 연구에서는 데이터 구동형 모델과 물리 모델을 이용해 관측 기반의 전구 수자원 분포를 1902년부터 2014년까지 재구축함으로써 지구의 평균온도가 약 1도 상승해온 지난 세기에 걸쳐 건기의 수자원 분포가 어떻게 변해왔는지 보인다. 재구축된 전구 변화 패턴은 인간활동에 의한 온실가스 증가등을 고려한 기후 모델 시뮬레이션과 흡사함을 알 수 있었으며 기후의 자연변동성만을 고려한 기후 모델 시뮬레이션에서는 발견되지 않았다. 주로 북아시아, 북미, 유럽 등 중위도 온대지방에서 더욱더 건조한 건기가 뚜렷하게 나타났으며 이는 강수량의 감소보다는 증발산의 증가에 기인하는 것으로 나타난다. 이와 같은 건조도의 변화는 미래 있어서 또한 인류에 대한 커다란 위협으로 자리한다. 미래 기후에서의 가뭄의 변화에 대해 다양한 연구들이 존재하지만 대부분 높은 수준의 온난화 (예를들어 RCP-SSP 585)에서의 영향에 국한된다. 다시 말해 인류가 21세기 중반에 달성을 목표로 하는 탄소중립이 가뭄의 측면에서 어떤 영향을 주게 될지에 대한 연구는 아직 충분하지 않다고 할 수 있다. 본 연구에서는 약한 혹은 중간 수준의 기후변화 시나리오를 이용해 파리협약에서 목표로 하는 1.5℃와 2℃ 상승에 따라 전 지구의 건조도 분포가 어떻게 변하고 그 변화에 있어서 어떠한 수문기후학적 메커니즘이 작용하는지 밝힌다. 지중해 연안 지역에서는 건조도의 가속이 +1.5℃와 +2℃사이에 존재하였으나 동아시아에서는 +1.5℃와 +2℃ 모두에서 습윤해짐을 알 수 있었으며 이러한 지역적 불균일성은 기후변화 대응 노력에 있어서 과거 온실가스 배출에 대한 책임뿐만 아니라 다양한 부문에 걸친 미래의 잠재 적응 노력 또한 고려해야만 함을 시사한다. 본 연구는 제6차 Coupled Model Intercomparison Project의 Land Surface, Snow, Soil-moisture Model Intercomparison Project (CMIP6/LS3MIP)와 Half a degree Additional warming, Prognosis and Projected Impacts (HAPPI)의 다중 모델 앙상블 시뮬레이션 결과를 이용했다.

• The Journal of the Korea Contents Association
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• v.17 no.1
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• pp.233-241
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• 2017

Annual reports on the ease of doing business, published from the World Bank, measure the regulations of economies that enhance business activity and those that constrain it by the 10 areas of business life-cycle. It then calculates the scores and ranks in each of the areas and in aggregate. The aggregate scores are the summation of the scores in the areas. This means that all the areas have the same weight. As evaluation results can vary greatly by the areas used and their weights, it is possible that the areas emphasized by small and medium-sized enterprises(SMEs) of Korea are not appropriately reflected in the evaluation results. From the viewpoint of small and medium-sized Korean enterprises, this paper tries to compare the ease of doing business of economies via determining the weights of the 10 areas. Through an AHP-based survey on Korean professors of a business school and SME CEOs, the weights are determined and then applied to the calculation of the aggregate scores and the ranks of the economies. While the changes in the top and bottom ranks are relatively small, some cases of big changes are found in the middle ranks.

• Journal of Satellite, Information and Communications
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• v.2 no.2
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• pp.10-15
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• 2007

Small size and low profile antenna for mobile vehicular-top-mounted is needed in satellite communication services such as DBS, Satellite Internet and VSAT. In middle latitudes, the development of an array antenna which has the conformal, low profile and 45 degree beam tilted configuration, and has the high gain with sharp beamwidth, low sidelobe and low loss is required for Ku-band satellite communication. In this paper, in order to meet with these performances, an array antenna consisting of the vertical polarized waveguide longitudinal slots based on the leaky-wave mode of traveling wave antenna is proposed. An array antenna consisting of 16 leaky-wave elements is showing 30 dBi of gain, 4.9 degree of beamwidth, below than -20 dB of sidelobe level, 45 degree of beam tilt angle in center frequency. Feed network designed by waveguide cooperated feed shows good performance of wideband and low loss.

• The Journal of the Convergence on Culture Technology
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• v.3 no.3
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• pp.1-6
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• 2017

In the case of book writing and publishing written by students, it has been implemented in the category of very few students. Even if it is limited to the minimum case, the detailed analysis of the effects will show that the education and learning effects are infinite, the maximum positive effect based on diversity and the effect of education and learning that can be extended to the continuation of sustainable capacity building. In this paper, I attempted to publish basic and intermediate major books on two occasions for first and second grade ordinary students majoring in IT. In addition to the basic satisfaction of education and learning, the book publishing performance of college student authors is excellent in various fields such as expansion of business based business, enlargement of major identity due to upward satisfaction, maximization of various late effects, securing sustainable development tendency. In the future, we plan to suggest ways to induce the general application of learning effect by conducting research that can achieve the same effect for middle and low level students.