• Journal of Digital Convergence
• /
• v.19 no.8
• /
• pp.219-224
• /
• 2021

The convergence of various industries has removed the boundaries of software application fields and reduced the restrictions on convergence fields. Software requirements are diversified and they want to reconfigure software requirements in a fast cycle. Since various changes in requirements have to be accepted technically, research on methodologies and standards to increase the efficiency of software productivity and methods for standardizing and producing software are needed. In this study, we studied how the reusability and complexity of the software asset reconfiguration system appeared according to the developer's characteristics and environment to utilize the assets optimized in previous studies. At this time, we measured how the change in complexity according to the usability and asset composition method that appears according to the developer's characteristics appears, but there is a limit to the collected data, so it is necessary to secure the quality of the measured value through continuous data collection. In addition, an intelligent system application plan is needed to supplement the problem of context classification in the use stage of complex assets.

• Korean Journal of Construction Engineering and Management
• /
• v.15 no.6
• /
• pp.53-62
• /
• 2014

Recently, the number of super high-rise building projects have been increased after recovering from international financial crisis. In super high-rise building project, vertical lifting is critical to overall project productivity, due to its limited lifting equipments. Also for projects which buildings' height are higher than 400m, transfer operation in lifting is inevitable because of lifts' maximum lifting height. In transfer operation, setting a transfer floor is essential for saving lifting time of resources. In this research, using discrete event simulation modeling with AnyLogic 7.0 software and metaheuristic optimization with OptQuest software, the method of optimizing a transfer floor for workers during the morning peak time is proposed. Comparing to the result of the case which transfer floor is designated to the middle floor, setting optimized transfer floor significantly decrease the total lifting time of workers. By using proposed simulation and optimization tool, saving budget and time through increasing available working hour is expected.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2006.05a
• /
• pp.1677-1680
• /
• 2006

하수처리장의 침전지 구조물은 고형물(SS) 및 현탁물을 침전, 제거하여 하수의 정화를 도모하는 시설로 초기 유입 하수의 생물학적 처리로 인해 발생되는 슬러지와 처리수를 분리함에 그 목적을 두고 있다. 침전지 구조물은 장소의 제약 및 침전지의 효율성 측면에서 많은 공법이 제안되고 있으며, 그중 이층 침전지의 경우 구조물의 시공비용 절감 및 공간 활용측면에서 단층 침전지에 비해 우수성을 인정받고 있다. 하지만 상 하 층에 위치하고 있는 침전지 유입부의 위치적 특성으로 인해 균등한 유량의 분배가 이루어지지 않고 유량이 한곳에 집중되는 현상으로 보일 수 있다. 본 연구에서는 3차원 수치모형인 FLOW-3D를 이용하여 이층 침전지의 유량분배 최적화를 위한 설계인자를 도출 하였다. 특히 상 하층에 위치하고 있는 유입부의 위치적인 특성을 고려하여 유입부의 직경을 상층 $500mm{\sim}600mm$, 하층 $500mm{\sim}700mm$으로 변화시키며 수치모의를 수행하였으며, 유입량의 분배효과를 확인하기 위해 각 동일한 위치에서 유입량을 산정하였다. 각 케이스별 분배효과를 분석한 결과 상 하층의 유입부 직경을 상층 600mm 와 하층 700mm를 적용했을 경우 유입량의 표준편차가 가장 작게 발생하며, 침전지 내부의 흐름이 원활하게 이루어지는 것으로 확인되었다. 본 연구에서는 상용 CFD모형인 FLOW-3D를 계획 중인 H하수처리장의 이층 침전지 설계에 적용하였으며 유입부 직경에 따른 분배효과를 분석하였다.

• Fire Science and Engineering
• /
• v.22 no.2
• /
• pp.97-103
• /
• 2008

As multiplex available premises become more complex and diversified due to increasing social and individual demands, the evacuation safety gradually deteriorates exhibiting functional difficulties even in ordinary fires. Considering the limitations of passive evacuation systems such as evacuation stairs and corridors, an evacuation facility must be designed, installed, and maintained the way that it remains fully functional and efficient when fire breaks out. This study tries to identify the issues of evacuation facilities and devise how to improve them by investigating the evacuation facility efficiencies of multiplex available premises and conducting a survey on fire safety attitude.

• Journal of the Institute of Electronics Engineers of Korea CI
• /
• v.47 no.1
• /
• pp.58-64
• /
• 2010

These days, the Internet networks have rapidly expanded and used in various fields and been recognized as essential in our daily life. However, there are users who have difficulties in access to web sites like those with physical disabilities. Therefore, our country as well as developed countries have paid more attention to web access, and organized investigation and research are needed. This study presents how to reduce the number of access for efficient web access by the visually disabled and designs user interface.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.12 no.1
• /
• pp.61-66
• /
• 2002

A position control algorithm for a flexible manipulator is studied. The proposed algorithm is based on a fuzzy theory with a Steady State Genetic Algorithm(SSGA) and an Adaptive Genetic Algorithms(AGA). The proposed controller for a flexible manipulator have decreased 90.8%, 31.8%, 31.3% in error when compared with a conventional fuzzy controller, fuzzy controller using neural network, fuzzy controller using evolution strategies, respectively when the weight and the velocity of end-point are 0.8k9 and 1m/s, respectively.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2003.05a
• /
• pp.165-168
• /
• 2003

본 논문에서는 무선 인터넷에 관한 관련 기술을 이용하여 분산 데이터 동기화 표준인 SyncML을 통해 무선 인터터넷 환경에서의 실제적으로 응용 가능한 영업 사원의 업무 자동화 (SPA : Sails Force Automation) 솔루션을 무선디바이스인 PHOPNE 과 PDA 에서 운영할 수 있는 최적 동기화 모듈의 설계와 구현에 목적이 있다. 본고에서는 무선 인터넷 기술, 동기화 기술, 영업사원의 업무 자동화 기술에 언급하고 세 가지 기술을 이용하여 실질적으로 물류, 유통 업무에 사용 할 수 있게 객체 지향 설계 방법과 소스를 분석하여 최적화된 시스템을 도출하고 그것을 통해 무선단에서 경량화된 동기화 최적의 시스템을 설계, 구현하였다. 무선단에서 여러 제약 사항 특히 데이터의 관리에 있어서의 문제점을 동기화 기술을 통해 많은 데이터를 효과적으로 관리함으로써 대용량의 데이터베이스와 디바이스에 상관없이 분산 데이터 일관성과 통합관리 기능을 유지하고 무선단에서 지연성(disconnection)에 대한 신뢰성을 유지 할 수 있는 시스템을 분석과 설계를 통해 객체지향적인 방법으로 고려해서 시스템을 구축하였다.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.49 no.12
• /
• pp.209-218
• /
• 2012

Recently, the Field Programmable Stateful Logic Array (FPSLA) was proposed as one of the most promising system integration technologies which will extend the life of the Moore's law. This work is the first proposal of the FPSLA design automation flow, and the approaches to logic synthesis, synchronization, physical mapping, and automatic placement of the FPSLA designs. The synchronization at each gate for pipelining determines the x-coordinates of cells, and reduces the placement to 1-dimensional problems. The objective function and its gradients for the non-linear optimization of the net length and placement density have been remodeled for the reduced global placement problem. Also, a recursive algorithm has been proposed to legalize the placement by relaxing the density overflow of bipartite bin groups in a top-down hierarchical fashion. The proposed model and algorithm are implemented, and validated by applying them to the ACM/SIGDA benchmark designs. The output state of a gate in an FPSLA needs to be duplicated so that each fanout gate can be connected to a dedicated copy. This property has been taken into account by merging the duplicated nets into a hyperedge, and then, splitting the hyperedge into edges as the optimization progresses. This yields additional 18.4% of the cell count reduction in the most dense logic stage. The practicality of the FPSLA can be further enhanced primarily by incorporating into the logic synthesis the constraint to avoid the concentrated fains of gates on some logic stages. In addition, an efficient algorithm needs to be devised for the routing problem which is based on a complicated graph. The graph models the nanowire crossbar which is trimmed to be embedded into the FPSLA fabric, and therefore, asymmetric. These CAD tools can be used to evaluate the fabric efficiency during the architecture enhancement as well as automate the design.

• Journal of KIISE:Software and Applications
• /
• v.35 no.4
• /
• pp.207-218
• /
• 2008

With the growth of the Internet, multimedia streaming becomes an important means to deliver video contents over the Internet and the amount of the streaming multimedia contents is also getting increased. However, it becomes difficult to guarantee the quality of service in real-time over the IP network environment with instantaneously varying bandwidth. In this paper, we propose an optimal adaptation framework for streaming contents over the Internet in the sense that the perceptual quality of the multi-angie content with multiple visual objects is maximized given the constraints such as available bandwidth and transcoding cost. In the multi-angle video service framework, the user can select his/her preferred alternate views among the given multiple video streams captured at different view angles for a same event. This enhanced experience often entails streaming problems in real-time over the network, such as instantaneous bandwidth changes in the Internet. In order to cope with this problem, we assume that multi-angle video contents are encoded at different bitrates and the appropriate video streams are then selected or transcoded for delivery to meet such bandwidth constraints. For the user selective consumption of the various bitstreams in the multi-angle video service, the bitstream in each angle can be encoded in various bitrate, and the user can select a sub-bitrstream in the given bitrstreams or transcode the corresponding content in order to deliver the optimally adapted video contents to the instantaneously changing network condition. Therefore, we define the transcoding cost which means the time taken for transcoding the video stream and formulate a unified optimization framework which maximizes the perceptual quality of the multiple video objects in the given constraints such as the transcoding cost and the network bandwidth. Finally, we present plenty of the experimental results to show the effectiveness of the proposed method.

• Journal of Korea Water Resources Association
• /
• v.32 no.3
• /
• pp.281-289
• /
• 1999

Small-scale hydropower projects at existing agricultural reservoirs can contribute to produce electric energy by maximizing the use of releases from the reservoirs. The irrigation water duration, the reservoir hydropower simulation, and the nonlinear programming model are employed to estimate potential hydroelectric energy at an existing reservoir. The nonlinear programming model consists of finding a maximum hydroelectric energy subject to irrigation water demand constraints. The sample reservoir given a set of inflow and irrigation water is considered. The optimal solutions by the optimization model yield the most hydroelectric energy for the analysis period in the three methods. Consequently, the nonlinear programming model uses the most water for hydropower generation with respect to the total inflow of the sample reservoir. It is also found that additional storage by increasing the normal water level of the sample reservoir does not significantly increase the annual hydroelectric energy for the given reservoir. It is expected that the optimization model and the proposed procedure for estimating potential hydroelectric energy can be applied to evaluate feasibility analysis for small scale hydropower additions at existing agricultural dams.