• The Journal of the Korea Contents Association
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• v.10 no.9
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• pp.243-250
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• 2010

With the help of digital technology, contents production process has become flexible and transmedia situation has been in the rise. Transmedia contents is a new type of contents being based on the various media platform and establishes a consistent story world. They are newly appeared mode of contents in the age of digital convergence. Users reading and watching the several versions of story in the transmedia contents can create a comprehensive contents experience and deepen it. Developing their own aesthetics and meaning of media text, transmedia contents is changing the textuality of digital contents, contents production process and contents using behaviors and contexts.

• Proceedings of the Materials Research Society of Korea Conference
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• 2011.05a
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• pp.244.2-244.2
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• 2011

We introduce a novel and robust method for the preparation of nanocomposite multilayers, which allows the excellent photoluminescent (PL) properties as well as the accurate control over the composition and dimensions of multilayers. By exchanging the oleic acid stabilizers of CdSe@ZnS quantum dots (QDs) synthesized in organic solvent with 2-bromo-2-methylpropionic acid (BMPA) in the same solvent, these nanoparticles were be alternately deposited by nucleophilic substitution reaction with highly branched poly(amidoamine) dendrimer (PAMA) through layer-by-layer (LbL) assembly process. Our approach does not need to be transformed into the water-dispersible nanoparticles with electrostatic or hydrogen-bonding groups, which can deteriorate their inherent properties, for the built-up of multilayers. The nanocomposite multilayers including QDs exhibited the strong PL properties achieving densely packed surface coverage as well as long-term PL stability under atmospheric conditions in comparison with those of conventional LbL multilayers based on electrostatic interaction. Furthermore, we demonstrate that the flexible multilayer films with optical properties can be easily prepared using nucleophilic substitution reaction between bromo and amino groups in organic media. This robust and tailored method opens a new route for the design of functional film devices based on nanocomposite multilayers.

• Journal of Advanced Navigation Technology
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• v.14 no.2
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• pp.253-259
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• 2010

Wireless mesh network is flexible network like Ad hoc network or bluetooth together based on base station. But, wireless mesh network shows high packet loss and when TCP was created, however as it was design based on wired link, wireless link made more transmission error than wired link. It is existent problem of TCP congestion control algorithm that TCP unfairness and congestion collapse over wireless mesh network. When TCP operation occurs with the packet loss where is not the congestion loss, it brings the performance degradation which is serious. In this paper, in order to improve efficient TCP congestion control algorithm in wireless mesh network, we proposed that TCP can adaptively regulate the congestion window in wireless link.

• Smart Media Journal
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• v.10 no.3
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• pp.54-59
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• 2021

Flight data acquired through flight instrumentation equipment during aircraft development play an important role in aircraft development and performance improvement. Therefore, as the reliability of flight instruments is required, inspection systems to check the soundness of flight instruments are very important. In this paper, we analyze the existing test system for flight data instrumentation equipment and present improvements in the hardware and software aspects of the test system. Based on this, we design and implement a test system with improved performance and present test results. Test system with improved performance improves cost savings, flexible application, and maintenance compared to the existing test system. Therefore, the robustness of the instrumentation equipment can be obtained, which can be expected to improve the reliability of flight data.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.6
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• pp.607-613
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• 2009

In this paper, we made a simple paper feeding system which is one of MTS (media transport system) and controllers. The plant has a flexible paper and two driving rollers and two driven rollers. The control system has two conventional PID controllers. Skew angle and feeding speed of MTS deteriorate the quality of feeding system. In order to control a feeding speed and skew of feeding paper, we control rotational velocity of two driving rollers. Therefore, this controller has two inputs and two outputs as MIMO (multi-input and multi-output) system. The control inputs were the feeding speed and the skew displacement of the paper. The control outputs were the rotational velocity to each driving roller. To find appropriate PID gains of two controllers, we proposed an optimization technique. We assume the system variables and performance of a whole system as follows. PID gains of two controllers for skew and feeding speed are system variables. System performance is both skew and feeding speed. We simulates to making mathematical correlation using global Kriging interpolation. To find appropriate value of system variables, optimization method is simulation in sequence as following method. First, the optimization solver simulates with DOE (design of experiment) tables to find correlation equation of both system variable and performances. Then, the solver guesses the appropriate values and simulates if the system variables are appropriate or not. If the result of validation doesn't satisfy the convergence and iteration tolerance, the solver makes a new Kriging models and iterates this sequence until satisfy the tolerances.

• Journal of Korea Game Society
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• v.9 no.3
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• pp.35-42
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• 2009

Analyzing the aspects of pattern in MMORPG that has been leading our domestic game industry to the climax, our game industry might be thought to orient the space narrative storytelling method containing the leading life in the virtual sociality to the nature of society. It is essential to have the convergence and linkage between media in describing the lifestyle in the virtual society, which should be operated in a very flexible manner. It is, however, true that we are lacking of the quantification of designing process until now, although the designing process should have the vivid academic functions between media in advance. In addition, the designing crossing over the MMORPG genre along with the game patterns in the MMORPG genre has close correlations with the spectrum of crises emerging recently in our domestic online game industry. In other words, this essay aims at raising an issue that the selective method to the lifestyle in the virtual society being settled down as characteristics inherent to the methods of our domestic online games might deliver the improving effects through the establishment of game designing jobs and compliant plans.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.7
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• pp.629-636
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• 2009

Mechanical stimulation is known to play a vital role on the differentiation of mesenchymal stem cells (MSCs) to pre-osteoblasts. In this research, we developed a tensile cell stimulator, composed of a DC motor-driven actuator and LVDT sensor for measuring linear displacement, to study the effects of tensile stress on osteogenic differentiation of MSCs. First, we demonstrated the reliability of this device by showing the uniform strain field in the silicon substrate. Secondly, we investigated the effects of tensile stretching on osteogenic differentiation. We imposed a pre-set cyclic strain at a fixed frequency on cell monolayer cultured on a flexible silicon substrate while varying its amplitude and duration. 60 min of resting period was allowed between 30 min of cyclic stretching and this cycle is repeated up to 7 days. Under the combined stimulation with osteogenic media and mechanical stretching, the osteogenic markers such as alkaline phosphatase (ALP), osterix, and osteopontin began to get expressed as early as 4 days of stimulation, which is much shorter than what is typically required for osteogenic media induced differentiation. Moreover, different markers were induced at different magnitudes of the applied strains. Lastly, for the case of ALP, we observed the antagonistic effects of osteogenic media when combined with mechanical stretching.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2010.11a
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• pp.104-105
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• 2010

H.264/AVC는 기존의 동영상 압축 표준안보다 훨씬 뛰어난 압축 효율을 보이나 상대적으로 높은 계산 복잡도를 보인다. 또한 최근 모바일 어플리케이션 및 DTV 등에서의 실시간 구현의 수요가 급증함에 따라 하드웨어 구현보다 상대적으로 flexible한 구조인 DSP 환경에서의 최적화 연구가 활발히 진행 중이다. 본 논문에서는 기존의 다중 참조 픽처 고속 움직임 보상 알고리즘에 대하여 DSP 환경에 맞게 구현 및 최적화를 통하여 실시간 구현 및 최적화 경향파악을 하고 있다. 수행된 DSP 최적화를 통하여 움직임 추정 평균 계산량을 픽셀 당 약 56.17%로 크게 감소시켰다.

• Journal of Korea Spatial Information System Society
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• v.11 no.2
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• pp.34-38
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• 2009

Based on the design of the LIS of GuangZhou and BeiJing, this paper discusses the resolution of the LIS with the kernel of process management. It applies the idea of workflow in the management supporting stratum, applies the process-oriented mechanism in the definition, coordination, supervision and control of the management process. The scheme has the character of information-media-oriented, work process dynamic changing supported, application system extended and restructure supported and is independent of the running environment of specific work.. Due to the previous character, the LIS is flexible, useable, elastic and able to support the dynamic application.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.06a
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• pp.53-54
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• 2014

본 논문에서는 멀티채널 오디오 재생시스템을 구성하는 라우드스피커들이 표준위치와 상이한 위치에 존재할 경우 입력된 멀티채널 오디오 신호가 표현하는 음장감을 최대한 유지하면서 주어진 라우드스피커 배치환경에 최적으로 가상음원과 멀티채널 오디오 신호를 재생하는 방법을 제안한다. 능동잡음제어 기술에 이용되는 LSM 기술을 활용하여 원음장과 스피커를 통해 재생되는 복원음장 사이의 오차를 최소화하는 음향공간필터를 설계하여 적용하였으며, 청취평가를 통하여 음장감이 유지됨을 확인하였다.