• Journal of the Korea Concrete Institute
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• v.20 no.1
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• pp.35-41
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• 2008

In general, flat plate systems have been used as a gravity load resisting system (GLRS) in building. Thus, this system should be constructed with lateral force resisting system (LFRS) such as shear walls and brace frames. GLRS should retain the ability to undergo the lateral drift associated with the LFRS without loss of gravity load carrying capacity. And flat plate system can be designed LFRS as ordinary moment frame with the special details. Thus, flat plate system designed as GLRS or LFRS should be considered internal forces (e.g., unbalanced moments) and lateral deformation generated in vicinity of slab joints render the system more susceptible to punching shear. ACI 318 (2005) allows the direct design method, equivalent frame method under gravity loads and allows the finite-element models, effective beam width models, and equivalent frame models under lateral loads. These analysis methods can produce widely different result, and each has advantage and disadvantages. Thus, it is sometimes difficult for a designer to select an appropriate analysis method and interpret the results for design purposes. This study is to help designer selecting analysis method for flat plate system and to verify practicality of the modified equivalent frame method under lateral loads. This study compared internal force and drift obtained from frame methods with those obtained from finite element method under gravity and lateral loads. For this purposes, 7 story building is considered. Also, the accuracy of these models is verified by comparing analysis results using frame methods with published experimental results of NRC slab.

• Korean Journal of Optics and Photonics
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• v.30 no.2
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• pp.37-47
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• 2019

A reflecting omnidirectional optical system with four spherical and aspherical mirrors, for use with long-wavelength infrared light (LWIR) for night surveillance, is proposed. It is designed to include a collecting pseudo-Cassegrain reflector and an imaging inverse pseudo-Cassegrain reflector, and the design process and performance analysis is reported in detail. The half-field of view (HFOV) and F-number of this optical system are $40-110^{\circ}$ and 1.56, respectively. To use the LWIR imaging, the size of the image must be similar to that of the microbolometer sensor for LWIR. As a result, the size of the image must be $5.9mm{\times}5.9mm$ if possible. The image size ratio for an HFOV range of $40^{\circ}$ to $110^{\circ}$ after optimizing the design is 48.86%. At a spatial frequency of 20 lp/mm when the HFOV is $110^{\circ}$, the modulation transfer function (MTF) for LWIR is 0.381. Additionally, the cumulative probability of tolerance for the LWIR at a spatial frequency of 20 lp/mm is 99.75%. As a result of athermalization analysis in the temperature range of $-32^{\circ}C$ to $+55^{\circ}C$, we find that the secondary mirror of the inverse pseudo-Cassegrain reflector can function as a compensator, to alleviate MTF degradation with rising temperature.

• Journal of Advanced Navigation Technology
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• v.16 no.6
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• pp.1092-1100
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• 2012

In this paper, it has designed and developed the integrated aural cueing system(ACS) system of the reconfigurable tactical Flight Training System(RTT) for the 6 rotorcraft such as UH-1H, UH-60, AH-1H, 500MD, BO-100, and CH-47. RTT is an evolving alternative instructional training system to provide the ability to rehearsal and collectively train, through networked simulators in a unit-collective and combined arms simulated battlefield environment. ACS handles the volume, pitch and repetition of the digitally stored sounds based on commands it receives from the Host server. This paper explained and implemented the conceptual and detail design the ACS system. In order to evaluating the performance of the ACS system, we made the monitoring system for interworking the virtual Host and the ACS system. As the result, it was confirmed the good performance.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.220-222
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• 2019

Korean automobile industry has been slow down since 2016. The most fundamental solution for solving this problem is to develop competitive parts. There are two important factors for developing competitive parts. The most important is product design technology, and the second most important is production technology. Production technology is important because it requires lowering the production cost except for the material cost and continuously maintaining the quality. In this paper, an intelligent smart inspection system is proposed and designed to inspect automobile parts of company C. At present, the basic and detailed design of this system has been completed and it is in the development progress stage. If the system is successfully developed, it is expected that the quality inspection stage of company C will be automated and the defect rate will be reduced.

• Journal of the Korea Concrete Institute
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• v.25 no.3
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• pp.271-281
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• 2013

The current seismic design code prescribes that a structural wall should be designed as a special shear wall when the building height is more than 60 m and its seismic design category is classified as D. However, the use of a special shear wall has a negative effect on constructability and economic efficiency. In the present study, the seismic performance of a special shear wall and a special shear wall with relaxed reinforcement detail was evaluated through a cyclic reversal loading test. The specimens were constructed to measure the results of the experimental variable regarding the reinforcement details of the special boundary element. Next, the seismic performances of a special shear wall structural system and that of a special shear wall structural system with relaxed reinforcement detail was evaluated by methods proposed in the FEMA P695. The cyclic reversal loading test results of this study showed that the performance of the shear wall with relaxed reinforcement detail was almost similar to the performance of a special shear wall and has the performance which requested from standard. The results of the seismic evaluation showed that all special shear walls with relaxed reinforcement detail are satisfied with the design code and seismic performance.

• Journal of Practical Engineering Education
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• v.8 no.2
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• pp.111-120
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• 2016

Education equipment for field programmable gate array (FPGA) design of sensor-based IOT (Internet Of Thing) system is introduced. Because sensors have different interfaces, several types of interface controller on FPGA need. Using this equipment, several types of interface controller, which can control ADC (analog-to-digital converter) for analog sensor outputs and $I^2C$ (Inter-Integrated Circuit), SPI (Serial Peripheral Interface Bus), and GPIO (General-Purpose Input/Output) for digital sensor outputs, can be designed on FPGA. Image processing hardware using image sensors and display controller for real and image-processed images or videos can be design on FPGA chip. This equipment can design a SOC (System On Chip) consisting of a hard process core on Linux OS and a FPGA block for IOT system which can communicate with wire and wireless networks. Using the education equipment, an example of hardware design using image sensor and accelerometer is described, and an example of syllabus for "Digital system design using FPGA" course is introduced. Using the education equipment, students can develop the ability to design some hardware, and to train the ability for the creative capstone design through conceptual, partial-level, and detail designs.

• Journal of the Korea Society of Computer and Information
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• v.15 no.9
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• pp.145-153
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• 2010

E-learning is cyber-education that gives open education to everyone by providing various contents through Internet and IT technologies, and it has been spreading rapidly. In this paper, we describes an effective prototype design scheme for establishing e-Learning center, centered on the case of A University, in order to overcome a lot of shortcomings related to cyber-education and to settle down efficient and systematic on-line realtime cyber education. For this purpose, we first analyzed the current status concerning e-Learning at A University. Learners and lecturers then participated in a survey so that we could find some problems on current e-Learning and prepare their solutions. We finally designed e-Learning center prototypes, and selected the prototype 2 as a best one and designed it in more details. The prototype made in this paper would be very useful to other institutes who want to establish a new e-Learning center.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.1
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• pp.1-7
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• 2008

In this paper, we developed digital TV commerce system using mobile device for multimedia service. This system combines TV and mobile device, and enables a TV viewer to purchase and download the multimedia contents such as songs and video programs onto the mobile devices instantly when the viewer watches the contents. Our system is different from the conventional TV commerce system in the sense that it combines digital TV and mobile device for better service, and the contents such as songs, videos and games are downloaded directly to the devices. Furthermore, our system's data flow is designed for utilizing cheaper network to save costs. We implemented this new service system, and in this paper, we describe the service in detail, comparing with conventional TV commerce system, and we present the architecture and preliminary implementation of the proposed system.

• Bulletin of the Korean Space Science Society
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• 2009.10a
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• pp.48.2-48.2
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• 2009

아리랑위성 2호는 2006년에 발사되어 정상 운영 중이다. 아리랑 위성 5호와 아리랑위성 3호는 각각 2010년과 2011년에 발사될 예정이다. 아리랑위성 2호의 운영시스템은 하나의 위성을 운영하는 개념에 따라서 개발되었다. 그러나 아리랑위성 3호 운영시스템과 아리랑위성 5호 운영시스템은 다중위성운영 개념을 도입하여 개발되고 있다. 다중위성운영 개념이란 (1) 임무를 준비하고 수행하기 위해서 충분한 임무 요소, 시설 요소, 인원 및 운영절차를 확보한다. (2) 각각의 운영시스템은 독자적인 임무 요소, 시설 요소, 인원 및 절차를 소유하나 하위 상세 부분들은 다른 운영시스템과 공유된다. 다중위성운영의 경우에 장비, 서브시스템, 운영절차 등이 다를 수 있고, 독자적인 운영시스템 구성이기 때문에 운영이 복잡하고 운영비용이 많이 든다. 이 논문에서는 이러한 점을 개선시키기 위해서 다중임무운영 설계개념을 제시한다. 다중임무운영 개념은 (1) 임무를 준비하고 수행하기 위해서 최근 수정 및 변경된 임무 요소, 시설 요소, 인원 및 운영절차를 확보한다. (2) 최근 수정 및 변경된 임무 요소, 시설 요소, 인원 및 운영 절차는 이전 개발된 운영시스템이 수행하는 기능을 지원한다. 이러한 개념의 다중임무운영은 비슷한 임무와 기능을 가진 위성들이 같은 운영자와 조직에 의해서 운영될 때 잘 적용될 수 있다. 다중임무운영시스템은 각각의 임무에만 사용되는 모듈과 다른 임무와 공통으로 사용되는 모듈로 구성된다. 이러한 개념에 따라서 운영시스템을 개발하면 개발하기 위한 시간과 예산을 크게 감소시킬 수 있다. 또한, 발사 이후 운영의 편리, 운영인력의 효율적인 활용 및 유지보수의 편리성으로 인해서 운영 상황이 크게 개선된다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2002.05a
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• pp.140-143
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• 2002

본 논문에서는 자율수중운동체(AUV, Autonomous Underwater Vehicle)의 실시간 충돌회피에 적용되는 휴리스틱 탐색기법에 적합한 퍼지조건연산자와 알파절단(aleph-cut)의 선택에 관해 논한다. 퍼지조건연산자와 알파절단은 두 퍼지관계에서 새로운 퍼지관계를 생성시키는 퍼지삼각논리곱의 연산에 적용되는데 이것은 휴리스틱탐색기법의 이론적 기반이 된다. 본 논문은 평가함수를 이용한 새로운 휴리스틱탐색기법을 설계하고, 이에 가장 적합한 퍼지조건연산자와 알파절단을 제안한다. 제안된 퍼지조건연산자와 알파절단의 검증을 위해 경로경비와 합리적인 경로를 생성하는 알파절단의 개수 관점에서 모든 경우의 퍼지조건연산자와 알파절단에 대해 시뮬레이션 한다. .