• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.257-260
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• 2002

히스토그램을 이용한 장면 전환 검출 기법은 순차적으로 접근하여 모든 프레임의 히스토그램을 구하고 각 히스토그램의 차를 이용하여 장면 전환 지정을 검출한다. 그러나, 이 방법은 장면 전환이 비교적 적게 일어나는 동영상 데이터에는 비효율적이므로 고정된 간격으로 프레임을 생략하거나, 가중치를 조절하여 가변적으로 프레임을 생략하는 히스토그램 비교법이 개발되어 왔다. 본 논문에서는 교육용 비디오를 위한 개선된 가변길이 프레임 생략법을 제안할 것이다. 이를 위해서 여러 가지 가중치를 사용하여 실험을 통한 좋은 가중치를 제시하고자 한다.

• The KIPS Transactions:PartD
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• v.15D no.6
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• pp.803-814
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• 2008

Product line architectures include variable parts to be selected according to product specific requirements. In order to derive architectures that are valid for a particular product from product line architectures, variabilities of product line architectures must be systematically managed. In this paper, we adopt an approach to variability management of product line architectures through an explicit mapping between a feature model and product line architecture models. If this mapping is incorrect or there exists inconsistency among product line architectural elements, variabilities of product line architectures cannot be managed correctly. Therefore, this paper formally defines product line architectural models in terms of conceptual, process, deployment, and module views, and mapping relationships between the feature model and the architectural models. Consistency rules for correct variability management of product line architectures are defined in terms of consistency in each of product line architecture model, consistency between different architectural view models, and consistency between a feature model and product line architectural models. These consistency rules provide a theoretical foundation for deriving valid product architecture from product line architectures.

• Journal of Korean Society of Transportation
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• v.17 no.1
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• pp.91-102
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• 1999

The objective of this study is to evaluate traffic management strategies using Variable Message Signs(MCS) on urban freeways. It is well known that real-time information on traffic conditions increases driver's comfort, and reduces the risks of accidents if drivers are aware of the traffic situation in advance, they decide whether to divert from the freeway or continue on the planned route. The experimental data collected on the Olympic highway we have shown the following results : 1. when the information on both the congested freeway and uncontested diversion route is displayed on the variable message sign. an additional 1.7 percent of traffic diverted, which results in a 3.7 percent reduction in total travel time. 2 Compared with one Proposed VMS message of 'reduce the speed', the other Proposed VMS message of 'keep speed 70km/h' is found to be much more effective in reducing mean speed.

• Journal of Satellite, Information and Communications
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• v.11 no.4
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• pp.44-47
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• 2016

In these days, interest of systems and services using TVWS(TV White Space) are increased, communication systems and services for TVWS have been actively studied. The unoccupied frequency in TVWS is different according to the geographical location and the time of day. RF systems having a frequency tunable bandpass filter operated in TVWS could be efficiently used. In this paper, a frequency tunable bandpass filter operated in 470 ~ 698MHz is designed and implemented. In consideration of simple control and physical size, the tunable bandpass filter is designed with 2-pole. The implemented tunable bandpass filter has the operating frequency band of 470 ~ 698MHz with control voltages of 1.58 ~ 3.93V, the insertion loss of maximum 4.78dB and the return loss of below 10dB. The implemented frequency tunable bandpass filter can be directly used in the RF receiver for TVWS and the design procedures could be used for developing a high power tunable bandpass filter as the basic research data.

• Journal of the Institute of Convergence Signal Processing
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• v.19 no.2
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• pp.42-46
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• 2018

Adaptive signal processing is quite important in various signal and communication environments. In adaptive signal processing methods since the least mean square(LMS) algorithm is simple and robust, it is used everywhere. As the step is varied in the variable step(VS) LMS algorithm, the fast convergence speed and the small excess mean square error can be obtained. Various variable step LMS algorithms are researched for better performances. But in some of variable step LMS algorithms the computational complexity is quite large for better performances. The fixed step LMS algorithm with a low computational complexity merit and the variable step LMS algorithm with a fast convergence merit are combined in the proposed sporadic step algorithm. As the step is sporadically updated, the performances of the variable step LMS algorithm can be maintained in the low update rate using Fibonacci sequence. The performances of the proposed variable step LMS algorithm are proved in the adaptive equalizer.

• Journal of KIISE:Software and Applications
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• v.33 no.2
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• pp.154-166
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• 2006

Product Line Engineering(PLE) is a software reuse paradigm that core assets are defined using common features in a domain and are instantiated in various applications. To apply the core asset effectively, variants which satisfy application requirements are extracted and the core asset should be also instantiated based on the variants. For the work, variability on architecture and components should be extracted exactly and an instantiation process and guidelines should be defined based on this variability In this paper, we define variability types depending on core assets elements and describe artifact templates related to tile variability. We also propose a systematic process which uses defined core assets including variability and verify practicability of the proposed process and variability expression through doing ease study. If utilizing with the proposed process in PLE, it can be feasible to model concrete core asset and variability and to utilize practical application engineering.

• 정보화사회
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• s.122
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• pp.34-36
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• 1998

인터넷을 이용한 전자상거래가 활성화됨에 따라 쇼핑몰을 포함한 참여 주체의 형태, 판매상품 또는 서비스, 업무처리 방식 및 지원형태 등이 시장 여건에 따라 매우 역동적이고 가변적으로 구성되어 상품 또는 서비스 형태를 시장에 진출할 것으로 보인다.

• Journal of Internet Computing and Services
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• v.7 no.4
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• pp.11-22
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• 2006

Software product-lines methodology is the software development paradigm to build the target system by customizing the variable part of software assets according to requirements. To attain this, the commonalities and variabilities of the system family should be modeled explicitly at early stage. Although the researches on general software product-lines are active, the researches on component-based real-time embedded software product-lines are rather inactive. In this paper a code generation system to support the functional variabilities via feature model and generate the code for synchronization via state model is proposed to increase the productivity of the development of the real-time embedded software product-lines.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.943-946
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• 2007

Recently, lots of research are going on relation to Improving the Flexibility through all of construction I industry in that space, materials, structure, construction method, etc. The style , space and pattern of housing have been changing by reason that satisfying change of residential environment at the needs of the times, transformation of future-oriented construction trend and recognition of demand-oriented. Therefore, this study should suggest alternations through comparing and analyzing to construction factor of improving the Flexibility, and then should show direction and guideline for realizing actual a long life housing at the next generation through applicable and various classification examples in apartment housing.

• Journal of Energy Engineering
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• v.9 no.2
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• pp.117-122
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• 2000

풍력발전시스템은 일정속과 가변속 풍력발전시스템으로 나누어진다. 일정속 풍력발전시스템은 유도발전기를 이용한 시스템이 주종을 이루고, 가변속 풍력발전시스템은 동기발전기-인버터로 이루어진다. 본 논문에서는 피치컨트롤이 장착된 두 시스템을 분석하여, 피치컨트롤의 제어 알고리즘을 유도하고 공기역학적 출력제어 국면에서 두 시스템의 출력제어를 비교 분석하고자 한다.