• Structural Engineering and Mechanics
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• v.32 no.2
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• pp.321-335
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• 2009

When a roof frame is subjected to the airblast loading, the conventional way to analyze the damage of the frame or design the frame is to use single degree of freedom (SDOF) model. Although a roof frame consists of beams and girders, a typical SDOF analysis can be conducted only separately for each component. Thus, the rigid body motion of beams by deflections of supporting girders can not be easily considered. Neglecting the beam-girder interaction in the SDOF analysis may cause serious inaccuracies in the response values in both Pressure-Impulse curve (P-I) and Charge Weight-Standoff Diagrams (CWSD). In this paper, an inelastic two degrees of freedom (TDOF) model is developed, based on force equilibrium equations, to consider beam-girder interaction, and to assess if the modified SDOF analysis can be a reasonable design approach.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.7 no.10
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• pp.35-45
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• 1984

1. The purpose of the study. The purpose of this study is to suggest the direction of educational curriculum for reinforcement of practical education of business management department in technical college. 2. The method of the study (1) The consciousness investigation of an undergraduate (2) The demand and supply program of human power in enterprise (3) An opinion of enterprise (4) An opinion of professor and school career (specialist) (5) On-the-spot practice (6) An educational curriculum 3. The suggestion and conclusion (1) An enterprise should collect graduate of technical college at the rate of fixed as a foreign (2) An opportunity of a going education and of proceeding to higher school at the rate of fixed should be provided (3) Buss management department in technical college should be subdivided and specialized (4) Industrial - educational cooperation complex should be realized and promoted stroghly.

• Proceedings of the Earthquake Engineering Society of Korea Conference
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• 1999.04a
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• pp.27-31
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• 1999

진도의 거리에 따른 감쇠양상은 두가치 측면에서 중요하다. 첫째는 역사지진의 크기를 평가하는데 사용되고 둘째는 역사지진자료를 이용하여 지진위험도를 평가하는데 이용된다. 한반도의 경우 대부분의 지진활동 자료가 역사지진이므로 이지진들의 크기를 결정하고 이들을 이용하여 지진위험도를 평가하기 위하여 합리적인 진도감쇠양상의 결정은 매우 중요한 과제라 할수 있다 진도의 감쇠양상은 진앙진도와 진앙거리 등 두요소에 같이 의존함이 알려져 있으므로 한반도에서 MMI VIII만의 지진자료를 이용하여 결정된 Lee의 기존의 감쇠공식은 그 사용범위에 한계가 불가피하므로 상기 두 가지 요소를 함께 고려한 새로운 감쇠공식의 유도가 요구되어진다. 지체구조적으로 Sino-Korean 지괴라고 불리우는 중국 북동부와 한반도에서 발생한 MMI VIII-X 지진들의 자료를 이용하여 한반도에서 발생하는 MMI VIII-X의 강진들에 대한 새로운 진도감쇠양상을 결정하였다.

• Korean Journal of Hydrosciences
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• v.5
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• pp.71-83
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• 1994

The objectives of the paper are to apply the gross erosion and sediment delivery ratio method for estimating sediment deposits and to define their trap efficiencies. For twenty irrigation reservoirs which have sediment survey data, the gross erosion was estimated from the channel erosion as well as the soil losses by applying USLE. The gross erowion was reduced to the sediment yields by multiplying the sediment delivery ratios. The results were multipled by trap efficiencies after Brune method to estimate sediment deposits, which were compared to sediment surveyed data. The comparisons showed deposits. And a trap efficiency relationship was derived from a regression method, which appeared better suited for irrigation reservoirs.

• Journal of the Korea Society of Computer and Information
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• v.23 no.1
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• pp.1-7
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• 2018

The Korean Air Force FA-50 aircraft currently operating in the Air Force is using Ultra High Frequency (UHF) frequency communications for navigation communications with ground control stations or other aircraft. The pilot communicates by changing frequency at any time during flight, and performs communication by directly inputting from the Integrated Up-Front Controller installed in the cockpit. The frequency is designated as secret, and the pilot receives the task with the frequency channel number (001~xxx) and finds the frequency of the channel in the list of 4,000 frequency channels and inputs it manually. This reduces the safety and convenience of pilots' operations and exposes them to hazards that may occur especially during night flight missions. In this paper, we propose a function to embed the frequency corresponding to the frequency channel list in IMDC, the aircraft mission computer, and to automatically change the frequency when the pilot only inputs the channel number.

• Journal of Engineering Education Research
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• v.22 no.2
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• pp.3-15
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• 2019

This study analyzed the evaluations of instructors and experts on flipped learning-based engineering in order to suggest improvement strategies. This study was conducted with 8 engineering courses which participated in the flipped learning course development project of C university from 2017-2018. As a result of the analysis, the instructors and experts pointed out that the pre-learning was not performed and checked effectively. In this regard, the instructors suggested the students' burden of pre-learning, the lack of understanding about flipped learning, and the experts suggested the lack of instructional strategies to facilitate pre-learning. In addition, the instructors and the experts pointed out that the courses were still instructor-centered. The instructors evaluated that they operated the instructor-led course by themselves. In addition, the experts suggested that there was not enough instructional strategies to activate the learner-centered activities. The number of the students and the lecture room environment that were not appropriate for the learner- centered class were the evaluation opinions of both the instructors and the experts. In addition, the professor suggested the lack of understanding and preparation of the flipped learning of the instructors and the learner as the main opinion, and the experts pointed out that the online learning system and classroom was not linked for pre-learning, classroom learning, and the post-learning. Based on these results, suggestions for improvement of flip learning based engineering course were suggested.

• The Journal of the Korea Contents Association
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• v.20 no.11
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• pp.581-589
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• 2020

This study aims to examine the effects of adjustment factors to college life on the work values of public health major students. We sampled 530 undergraduate students majoring in public health administration and engineering from Kyunggi-do, and analyzed the data using t-test, correlation and regression methods obtained from SPSS Win 21.0 software. We found that (1) a student's intrinsic work value is positively related to their adjustment to college life factors but extrinsic work value is positively related to 'professor-student interaction', 'college life satisfaction' and 'expectation for the service college'; (2) 'social integration', 'professor-student interaction' and 'expectation for the service college' influenced to intrinsic work value; (3) 'career identity', 'family support', and 'college life satisfaction' influenced to extrinsic work value. Based on the results of this study, that the improvement of adjustment to college life factors influence on the work values were discussed.

• Geotechnical Engineering
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• v.14 no.3
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• pp.95-108
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• 1998

Downhole testing and seismic CPT (SCPT) have been widely used to evaluate stiffness profiles of the subgrade. Advantages of downhole testing and SCPT such as low cost, easy operation and a simple seismic source have got these testings more frequently adopted in site investigation. For the automated analysis of downhole testing and SCPT, the concept of interval measurements has been practiced. In this paper. a new inversion procedure to deal tilth the interval measurements for the automated downhole testing and SCPT (including a newlydeveloped continuous SCPT) is proposed. The forward modeling in the new inversion procedure incorporates ray path theory based on Snell's law. The formulation for the inversion analysis is derived from the maximum likelihood approach, which estimates the maximum likelihood of obtaining a particular travel time from a source to a receiver. Verification of the new inversion procedure was performed with numerical simulations of SCPT using synthesized profiles. The results of the inversion analyses performed for the synthetic data show that the new inversion analysis is a valid procedure which enhances Va profiles determined by downhole testing and SCPT.

• Agricultural and Biosystems Engineering
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• v.3 no.2
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• pp.73-78
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• 2002

Cabbage is one of the most important vegetable in Korea. The cabbage production was mainly based on human labor A comprehensive research fur substituting the human labor by machines has been performed until now. In general, cabbage is cultivated on hillside in Korea. Picking up the harvested cabbages in field and carrying to a vehicle fur transportation are very laborious work. Manual transportation of cabbage is likely to damage the quality and is also a cause to increase the cost of cabbage production. This study was to develop and evaluate a prototype cabbage loader fur efficient and safe transportation of cabbage. The developed loader was a semi-tracked vehicle operated by a hydraulic system, allowing the safe transportation and loading of cabbage in a steep field. The maximum loading weight of the loader was 1.0 ton. By using two sets of safety devices attached to the loader to avoid the roll-over in a steep field, the static rollover slopes were increased up to 34.0% and 37.4% fur the left and the rear direction, respectively The maximum field speed was about 6km/hr with two cabbage pallets of 750kg at a 25% inclined field. The loading capacity of the loader was about 35 pallets/hr when picking up, carrying, and unloading two cabbage pallets for one loading operation. The loading capacity was more than 8 times in comparison with the conventional human labor. The developed loader could be used fur loading and carrying the other vegetables. The study suggested a possible approach for designing the field machines operated on hillside.

• Journal of Digital Convergence
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• v.17 no.3
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• pp.63-71
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• 2019

The cruise industry is a future-oriented convergence industry based on tourism and shipping, and has attracted great attention not only in the global market but also in Korea. The rapid growth of Asian cruise population, especially in China, has had a considerable impact on both the global market as well as the Korean market. With the recent THAAD problem, the need for diversification of the market has been raised as the entry of cruise tourists from China has been greatly reduced. It is also time for a more systematic and comprehensive development strategy ahead of the opening of the new cruise terminal. This study draws out the problems based on the interviews with experts such as prefectures, travel agencies, and related organizations, as well as analyzing literature on domestic and overseas government plans, policy reports, and research data. Then, the SWOT analysis is used to develop the development strategy and explore the policy support direction. The research scope can be extended to sustainable development model through wider linkage of mid to long term strategy and policy.