• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.569-570
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• 2021

온라인 교육은 컴퓨터 테크놀로지 발달과 웹 기반 정보 통신 기술의 발전에 따라 효과적인 방법으로 자리 잡으면서 새로운 패러다임으로 꾸준히 성장해 오고 있다. 최근 코로나 19로 인해 초, 중, 고등학교를 비롯하여 대학교는 2020년 3월 역사상 처음으로 개강을 비대면 온라인 상황으로 맞이하게 되었다. 온라인 강의 시청수요가 늘어남에 따라 영상에 대한 필기 양도 많아지고 있다. 온라인 강의는 대부분 시각적 자료와 함께 교수자의 설명이 더해진다. 시각자료에 대한 부가적인 설명과 교수자의 말로 설명이 되는 부분에 대해 필기를 할 때 시각 자료를 그려 필기하거나 영상의 어느 부분에 해당 내용이 나오는지 시간을 같이 메모해서 봐야 하는 불편함이 있다. 본 논문에서는 해당 문제점을 해결하기 위해 영상을 시청하며 구간에 메모를 저장, 표시하는 시스템을 설계 및 구현하고자 한다. 학습자가 영상에 직접 메모를 표시하여 맞춤형 학습에 따른 복습 효용성 향상에 긍정적인 역할을 하도록 한다.

• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.5
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• pp.931-938
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• 2020

Recently, with the expansion of the use of cross media, the public is not just watching the broadcast, but is also consuming various information about actor, stories, products, etc. that appears during the broadcast. However, the devices used for viewing and the devices used for searching are different, which is inconveniences, and due to the differences between the point in time when the desired information is provided through the search, the public has difficulty in obtaining detailed information of the target product after encountering product placement advertisement. In addition, it is difficult for advertisers to confirm the effect of product placement advertising through the reaction of viewers who have encountered product placement advertising. In this paper, we intend to propose an interactive streaming platform that supports the instant retrieval of product information to users by including product placement advertisement information in broadcasting. Through this, viewers can quickly receive detailed information of products on the screen by giving an event when a product of interest comes out while watching the broadcast, and advertisers can check the effectiveness of product placement advertisements by receiving interactive responses from viewers.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.23 no.1
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• pp.73-80
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• 2010

Wind-induced vibration is one of the important structural design factors for serviceability of tall buildings. In order to evaluate the reliable wind-loads and wind induced-vibration, it is necessary to obtain the exact natural period of buildings. The discrepancy in the natural period estimation often results in the overestimation of wind loads. In this study, the effectiveness of lateral stiffness estimation method for tall buildings with flat plate system is evaluated. For this purposed, the results of finite element analysis of three recently constructed buildings are compared with those obtained from field measurement. For the analysis, factors affecting on the lateral resistance such as cracked stiffness of vertical members, elastic modulus of concrete, effective slab width, and cracked stiffness of link beam are considered. Form the results, it is found that the use of non-cracked stiffness and application of dynamic modulus of elasticity rather than initial secant modulus yields closer analysis result to the as-built period.

• The Journal of Information Technology
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• v.3 no.2
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• pp.39-47
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• 2000

Among the compression methods of moving picture information, a motion estimation method is used to remove time-repeating. The Block Matching Algorithm in motion estimation methods is the commonest one. In recent days, it is required the more advanced high quality in many image processing fields, for example HDTV, etc. Therefore, we have to accomplish not by means of Partial Search Algorithm, but by means of Full Search Algorithm in Block Matching Algorithm. In this paper, it is suggested a structure that reduce total calculation quantity and size, because the structure using Bit Plane select and use only 3bit of 8bit luminance signal.

• Journal of Korean Society of Steel Construction
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• v.19 no.3
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• pp.313-321
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• 2007

The study discussed in this paper presents a method of estimating sources of geometric errors in suspension bridges in use, based on geometric survey data. A geometric error is defined as the difference between the survey data and the design geometry of a main cable. It is assumed that the geometric error in a suspension bridge is caused by the variations in the weight of the stiffening girder and the deformation of the anchorage foundations due to the creep of soil. The variations in the girder weight and the deformation of the foundation were estimated by constructing a matrix of factors that affect suspension bridges due to the variations. To check the validity of the proposed method, it was applied to the Kwang-An Bridge, and the sources of geometric errors in the bridge were estimated using the survey data.

• Journal of Life Science
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• v.17 no.4 s.84
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• pp.503-509
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• 2007

The purpose of this study was to investigate the effect of Gi exercises and soybean milk supplement on the body composition and the physiological parameters including blood level of lipids and related hormones in middle-aged women. The Gi exercise program was composed of warming-up(10 min), main exercise(40 min) and cooling-down(10 min). The 40 middle-aged women between 40 and 60 years old were divided into four groups; the control group(12 women), the Gi exercise group(14 women), the soybean milk supplement group(11 women), and the Gi exercise group with soybean milk supplement(14 women). The Gi exercise program was applied three times a week and two packs of the soybean milk per day were given. The result of this study was as follows 1. The control group showed the increase of body weight, percent body fat, and fat mass than other groups. 2. The blood level of T-C was increased in the control group and the Gi exercise group and exercise with supplemented group were decreased 3. The blood level of HDL-C was significantly decreased in the control group than other groups. 4. The blood level of LDL-C was significantly increased in the control group than other groups. 5. The level of TG were not significantly changed in all groups 6. The follicular stimulating hormone (FSH) and luteinizing hormone (LH) hormone levels were not significantly changed in all study groups

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.1079-1082
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• 2015

In Article 23 of Technical regulations for Telecommunication Line and Facilities, we have criteria of separation distance between telecommunication lines and power lines, and its related exceptional conditions. However, this is a conflicts condition with Article 32 that provides the type of indoor telecommunication cables such as twisted-pair cables and optical fiber cables. Also, it is frequently raised that exceptional condition related the PoE cables with up to 15.4W is improved to accept PoE cables with up to 30W. In this paper, we have proposed improvement plans of Technical regulations for separation distance between telecommunication lines and power lines by analyzing the variety of standard specifications at home and abroad.

• Journal of Korean Society of Steel Construction
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• v.23 no.2
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• pp.179-188
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• 2011

The performance-based design is highlighted as an alternative for the current design method, which cannot definitely specify the performance level that a building requires. Research on it is already in progress, however, in developed countries like the United States and Japan, to establish the basis for a performance-based design. Many studies on such design are also being conducted in South Korea, but South Korea still lags behind other countries in all-around technology. On the other hand, the column members, especially the lower external column, are affected by the variation of the axial force by overturning the moments in the case of lateral loads by earthquake. Varying the axial force can affect the time of local buckling and the ultimate behavior. Thus, in this study, the structural performance, such as the time of local buckling and the ultimate behavior, was analyzed through an experimental study on column members under varying axial force. The feasibility of a domestic study proposing a performance level with a story drift angle formed about a structural-performance-based steel structure design was also verified.

• Proceedings of the Korean Vacuum Society Conference
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• 2015.08a
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• pp.209.1-209.1
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• 2015

Indium gallium zinc oxide (IGZO), indium zinc oxide (IZO) 그리고 zinc tin oxide (ZTO) 같은 zinc oxide 기반의 산화물 반도체는 높은 이동도, 투과도 그리고 유연성 같은 장점을 갖고 있어, display application의 backplane 소자로 적용되고 있다. 또한 최근에는 산화물 반도체를 이용한 thin-film transistor (TFT) 뿐만아니라 resistive random access memory (RRAM), flash memory 그리고 pH 센서 등 다양한 반도체 소자에 적용을 위한 연구가 활발히 진행 중이다. 그러나 zinc oxide 기반의 산화물 반도체의 전기 화학적 불안정성은 위와 같은 소자에 적용하는데 제약이 있다. 산화물 반도체의 안정성에 영향을 미치는 다양한 요인들 중 한 가지는, sputter 같은 plasma를 이용한 공정 진행 시 active layer가 plasma에 노출되면서 threshold voltage (Vth)가 급격하게 변화하는 plasma damage effect 이다. 급격한 Vth의 변화는 동작 전압의 불안정성을 가져옴과 동시에 누설전류를 증가시키는 결과를 초래 한다. 따라서 본 연구에서는, IGZO 기반의 TFT를 제작 후 plasma 분위기에 노출시켜, power와 노출 시간에 따른 전기적 특성 변화를 확인 하였다. 또한, thermal annealing을 적용하여 열처리 온도와 시간에 따른 Vth의 회복특성을 조사 하였다. 이러한 결과는 추후 산화물 반도체를 이용한 다양한 소자 설계 시 유용할 것으로 기대된다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.9 no.1
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• pp.52-59
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• 1998

We calculated the wave attenuation due to rain using the effective permittivity of the air with raindrops. The effective permittivity depends on the complex permittivity of rain drop and the fractional volume occupied by the raindrops. We calculate the complex permittivity of rain drop and the raindrops' volume using Marshall-Palmer Rain drop size distribution. The rain attenuation calculated by effective permittivity is compared with the results of ITU rain attenuation model, and the two rain attenuation models have a very close agreement. The effetive permittivity model underestimates the rain attenuation under 50 GHz, and overestimate at the frequencies under 50 GHz copmpared with the ITU model.