• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.419-424
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• 2006

대청호로 유입하는 탁수의 감시와 저수지내의 시공간분포를 예측할 수 있는 실시간 탁수감시 및 예측시스템(RTMMS)을 개발하였다. RTMMS는 탁도와 수온 등 실시간 계측자료를 데이터베이스에 저장.조회하는 실시간 감시(Realtime Monitoring), 2차원 탁수예측 수치모델의 입력자료 생성(Input Data), 탁수예측 수치모델의 수행 (W2 Run), 모의결과의 조회 및 저수지 운영 시나리오별 탁수조절 효과분석을 위한 후처리 (Post-Process) 기능을 제공한다. 시스템의 GUI 화면은 개별 기능을 탭 형식으로 제공하여 사용자가 순차적으로 자료조회와 모델수행 그리고 결과분석을 쉽게 수행할 수 있도록 설계하였다. RTMMS는 강우사상 동안 유입하천의 수온예측을 위해 대기기온, 이슬점온도, 하천유량자료를 독립변수로 이용하는 다중회귀모델(DMR)을 사용하며, 탁도 예측은 유량과 SS 부하량의 상관관계를 이용하는 탁도예측모델(QLM)을 사용한다. 저수지로 유입한 탁수의 밀도류 거동과 시공간적인 탁도분포 예측은 2차원 횡방향 평균 수리 수질해석 모형인 CE-QUAL-W2를 채택하였다. 개발된 시스템은 2004년 홍수기를 대상으로 시범적용 하였으며, 그 결과를 실측자료와 비교하여 제시하였다. RTMMS는 저수지 탁수발생 현황조회, 취수원 도달시간 및 지속기간, 밀도류와 전도현상을 고려한 시공간 분포 예측, 발전 및 수문방류, 선택취수 등 다양한 저수지운영 시나리오에 따른 상.하류 영향 분석, 용수 이용자에게 탁도 예측정보의 제공 등 탁수를 고려한 저수지운영 의사결정지원 도구로써 매우 유용하게 활용 될 것으로 기대된다.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.531-534
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• 2007

In the current domestic design-build contract, design and construction are separated due to prohibition of outside work. but instead the design-build contract adopts a method of fulfilling each assignment as a joint venture, which makes it difficult for participants to communicate each other and often require changes of design. also, It is difficult to performance efficiency project that they don't want to share useful information related to design and construction. In this study suggests how to maxmize the effiency of the project by proposing a process model connected with an efficient partnering and constructability in a deign development phase of design-build constract.

• Journal of Digital Contents Society
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• v.7 no.4
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• pp.235-243
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• 2006

This paper presents the development of certain efficient method for expressing the emotion of an avatar based on the facial expression recognition. This new method is not changing a facial expression of the avatar manually. It can be changing a real time facial expression of the avatar based on recognition of a facial pattern which can be captured by a web cam. It provides a tool for recognizing some part of images captured by the web cam. Because of using the model-based approach, this tool recognizes the images faster than other approaches such as the template-based or the network-based. It is extracting the shape of user's lip after detecting the information of eyes by using the model-based approach. By using changes of lip's patterns, we define 6 patterns of avatar's facial expression by using 13 standard lip's patterns. Avatar changes a facial expression fast by using the pre-defined avatar with corresponding expression.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2003.11a
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• pp.105-108
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• 2003

본 논문에서는 Microsoft DirectShow기반의 DSM-CC Object Carousel과 Data Download 프로토콜을 위한 인코더의 설계 및 구현에 대해 기술한다. DirectShow는 Component Object Model (COM) 기술을 기반으로 하고 있다. 따라서, 작성된 코드의 재사용과 유지보수가 용이하고, 멀티미디어(Multimedia) 데이터를 편리하게 처리말 수 있는 기능을 제공한다. 또한, 개발자가 COM component를 쉽게 제작할 수 있는 방법을 제공한다 하지만, 스트리밍 오디오/비디오 등의 디코딩을 위주로 개발된 DirectShow기술이 데이터 방송 서버에서의 실시간 인코딩 작업에 사용할 때에는 문제점이 발생한다 Data Carousel 방식에서는 인로딩 도중에 Update를 지원해야 한다. 즉, Carousel데이터의 Update가 있을 경우, 스트리밍(Streaming) 하는 동안 Update된 데이터를 인코딩 하여야 한다. 이러한 상황은 DirectShow의 기본 상태로는 표현하기 어려우므로 기본 상태를 확장하여 별도의 사용자 정의 상태를 추가하였다. 또한, 두 작업을 동시에 수행하기에 적합한 스레드(thread) 모델과 Push/pull 버퍼 모델을 설계하였다. DirectShow를 이용하여 인코더를 구현함으로써 개발자는 개발시간과 비용을 절약 할 수 있고, 사용자에게는 인코더를 등록하고 실행하기 쉬운 환경과 인로딩 상태의 실시간 모니터링 기능을 제공한다.

• Journal of the military operations research society of Korea
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• v.34 no.3
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• pp.1-12
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• 2008

Design of supply chain network (SCN) is required to optimize every factor in SCN and to provide a long-term and strategic decision-making. A mathematical model can not reflect the real world because design of SCN contains variables and stochastic factors according to status of its system. This paper presents the designing methodology of military SCN using the mathematical model and the simulation model. It constructs SCN to minimize its total costs using the Mixed Integer Programming (MIP) model. And we solve problems of a vehicle assignment and routing through adaptation of experiment parameters repeatedly in the simulation model based on the results from the MIP model. We implement each model with CPLEX and AutoMod, and experiment to reconstruct SCN when the Logistic Support Unit is restricted to support military units. The results from these experiments show that the proposed method can be used for a design of military SCN.

• Journal of Digital Convergence
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• v.16 no.2
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• pp.73-82
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• 2018

The purpose of this study was to apply Keller's ARCS motivational model to the business culture lessons and to examine the effects on cultural knowledge, interest, awareness and attitude of university students. To accomplish this purpose, the teaching-learning method applying ARCS model for business culture was designed, aiming to improve all elements of learning motivation such as attention, relevance, confidence and satisfaction. The experiment was conducted with two groups as follows; one experimental group that received instruction using ARCS model and the other comparison group that received traditional lecture instruction. Both the instruction using the ARCS model and the traditional lecture instruction was effective in increasing knowledge of culture. The instruction using the ARCS model was verified to improve interest in culture, understanding of others from other cultures, motivation to create culture, perception of importance of culture, and perception of necessity of culture education. But the traditional lecture instruction did not show statistically meaningful effects on cultural interest, awareness and attitude.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.40 no.8
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• pp.619-630
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• 2003

We present a method of runtime configuration scheduling in reconfigurable SoC design. As a model of computation, we use a popular formal model of computation, hierarchical FSM (HFSM) with synchronous dataflow (SDF) model, in short, HFSM-SDF model. In reconfigurable SoC design with HFSM-SDF model, the problem of configuration scheduling becomes challenging due to the dynamic behavior of the system such as concurrent execution of state transitions (by AND relation), complex control flow (HFSM), and complex schedules of SDF actor firing. This makes it hard to hide configuration latency efficiently with compile-time static configuration scheduling. To resolve the problem, it is necessary to know the exact order of required configurations during runtime and to perform runtime configuration scheduling. To obtain the exact order of configurations, we exploit the inherent property of HFSM-SDF that the execution order of SDF actors can be determined before executing the state transition of top FSM. After obtaining the order information and storing it in the ready configuration queue (ready CQ), we execute the state transition. During the execution, whenever there is FPGA resource available, a new configuration is selected from the ready CQ and fetched by the runtime configuration scheduler. We applied the method to an MPEG4 decoder and IS95 design and obtained up to 21.8% improvement in system runtime with a negligible overhead of memory usage.

• Journal of Internet Computing and Services
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• v.10 no.6
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• pp.7-17
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• 2009

The development of wireless communication MAC layer is usually released as SoC which is a combination in hardware and software. In this system development environment, an environment for software development and verification is necessary because the hardware development takes a lot of time priori to completion. In integrated development of hardware and software, simulation environment of hardware and software provided by hardware modeling using HDL at RTL and ISS respectively. By increasing the development complexity of system, ESL design modeling systems at higher abstraction level than RTL has already prompted. The ESL design is divided untime model and time model. This paper present design and implementation of MCU for untime model simulation, not time model. Proposed MCU can optimize the system at early step of system development and move up the development completion time by verifying the system function easily and rapidly than part required exact time in untime model. In this paper, we present an MCU module based on SystemC and UC/OS-II Module providing real-time operate system.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.44 no.5
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• pp.416-422
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• 2016

This paper presents preliminary performance analysis of a satellite formation flying testbed, which is under development by Astrodynamics and Control Laboratory, Department of Astronomy, Yonsei University. A model reference adaptive controller (MRAC) with a first-order reference model is chosen to enhance the response of reaction wheel system which is subject to uncertainties caused by unmodelled dynamics and measurement noise. In addition, an on-line parameter estimation (OPE) technique based on the least square is combined to eliminate the effect of angular measurement noise by estimating the moment of inertia. Both numerical simulations and hardware experiments with MRAC support the effectiveness and applicability of the adaptive control scheme, which maintains the tracking error below $0.25^{\circ}$ for the entire time span. However, the high frequency control input generated in hardware experiment strongly suggests design modifications to reduce the effect of deadzone.

• Journal of Digital Convergence
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• v.19 no.5
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• pp.197-205
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• 2021

Recently, the retail industry has been increasingly demanding information technology convergence and utilization to respond to various external environmental threats such as COVID-19 and to be competitive using AI technologies, but there is a very lack of research and application services. This study is a CCTV video data-driven AI application case study, using CCTV image data collection in retail space, object detection and tracking AI model, time series database to store real-time tracked objects and tracking data, heatmap to analyze congestion and interest in retail space, social access zone.We present the orientation and verify its usability in the direction designed through practical implementation.