• Proceedings of the Korea Society of Design Studies Conference
• /
• 1999.10a
• /
• pp.36-37
• /
• 1999

1990년대에 접어들면서 기업의 제품개발환경은 급속히 변화하였다. 디자인 설계, 시험, 프로토타입 및 생산에 이르는 순차적이고 전통적인 개발환경으로부터 디자인에서 생산까지를 CAID/CAD/CAM을 이용한 통합된 시스템으로 일관되게 진행하는 동시공학을 적용함으로써 제품의 개발기간과 비용을 단축시키고 있다. (중략)

• Proceedings of the KIEE Conference
• /
• 2006.07d
• /
• pp.1883-1884
• /
• 2006

원자력발전소는 원자로의 증기발생기에서 생산한 증기의 압력으로 터빈발전기를 돌려서 발전을 하고 있다. 터빈속도를 제어하는 디지털식 터빈 조속기는 마이크로프로세서를 기반으로 하는 디지털식 제어기가 널리 사용하고 있으며, 조속기에 사용되는 제어기는 빠른 제어 응답성과 높은 신뢰성을 요구하고 있으므로 제어 프로그램의 실행속도에 따라서 제어의 특성과 질이 좌우 될 수 있다. 디지털식 제어기는 제어프로그램을 순차적으로 반복 실행하며, 중요도에 따라서 몇 개의 그룹으로 나누어 실행 주기를 달리함으로써 제어기의 과도한 부하율을 피하고 있다. 이렇게 함으로써 빠른 제어 응답성과 시스템 안정성을 모두 만족하는 실행주기로 최적화하는 과정이 필요하여 본 시험을 하였으며 이러한 제어특성을 사전에 확인하여 원자력발전소의 아날로그식 조속기를 디지털식 조속기로 개선을 하고자 시험한 사례를 소개한다.

• Aerospace Engineering and Technology
• /
• v.12 no.1
• /
• pp.182-188
• /
• 2013

This paper described flight safety center, flight safety information system(FSIS) and flight safety officer's mission and training in sequence and presented analysis's results and data processed in real-time during KSLV-I 3rd flight test. During flight safety center's operation for the 3rd flight test, monitoring of KSLV-I flight status was normally performed and the algorithms for flight safety calculations including the one for instantaneous impact point computations are also executed normally.

• Journal of Intelligence and Information Systems
• /
• v.23 no.1
• /
• pp.109-126
• /
• 2017

In the various kinds of intelligent services, many studies for detecting emotion are in progress. Particularly, studies on emotion recognition at the particular time have been conducted in order to provide personalized experiences to the audience in the field of exhibition though facial expressions change as time passes. So, the aim of this paper is to build a model to predict the audience's emotion from the changes of facial expressions while watching an exhibit. The proposed model is based on both sequential neural network and the Valence-Arousal model. To validate the usefulness of the proposed model, we performed an experiment to compare the proposed model with the standard neural-network-based model to compare their performance. The results confirmed that the proposed model considering time sequence had better prediction accuracy.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.45 no.11
• /
• pp.998-1005
• /
• 2017

In this paper, we first introduce a systematic verification procedure for hierarchically structured avionics system. By making use of equipment models, it can perform individual verifications of each subsystem, integrated verifications of multiple subsystems, and an integrated verification of a whole system. A multi-mode system integration laboratory is then proposed to make it possible to execute various individual or integrated verification tests at the same time. By mathematically proving that the proposed multi-mode system integration laboratory needs less verification time than the conventional verification methodology, it is expected to enhance the efficiency of the systematic verification procedure and as a result, reduce the overall verification period and costs.

• Journal of the Korea Convergence Society
• /
• v.4 no.3
• /
• pp.21-26
• /
• 2013

Currently almost people use a personal computer for various purpose. But some people are not familiar to computer system. If they see only black screen on the monitor when they turn on the computer power, they can not recognize whether it is hardware or software faults. So, in this paper is aimed to develop the module of computer hardware fault detecter using ROM BIOS before OS booting. This module use PCI interface with mother board of computer. Before os booting, it can get the ROM BIOS memory by interrupt and show what hardware is fault according to the predefined memory content of BIOS.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.38 no.6
• /
• pp.557-563
• /
• 2010

This paper addresses the issue of adaptive global optimization using Kriging metamodel known as EGO(Efficient Global Optimization). The algorithm adaptively chooses where to generate subsequent samples based on an explicit trade-off between reduction of global uncertainty and exploration of the region of the interest. A strategy that saves the computational cost by using expectations derived from probabilistic nature of approximate model is proposed. At every iteration, a candidate test point that seems to be feasible/inactive or has little possibility to improve for minimum is identified and excluded from updating approximate models. By doing that the computational cost is saved without loss of accuracy.

• Nuclear Engineering and Technology
• /
• v.26 no.4
• /
• pp.502-506
• /
• 1994

The design of safety computer system is described along with the case of software design and testing in the Core Protection Calculator System (CPCS). The application of computer system in safety system requires not only hardware qualification but thorough testing on software to verify its correctness and completeness. The testing on software for CPCS is performed by comparing the outputs of two versions of code. One is implemented in assembly language and the other is in Fortran. The testing is performed in sequencial and overlapping manner. Phase I test verifies that each software module is implemented correctly by executing every branch. Phase II test verifies that the integrated software is complete, meeting its requirements specification and also the integrated system meet its requirement and timing constraints. Through these testing, the Yonggwang Nuclear Power Plant Units (YGN) 3 and 4 CPCS software is verified to be correct and complete, and the integrated system is designed as in its requirements specification.

• Journal of the Korean Society of Propulsion Engineers
• /
• v.15 no.1
• /
• pp.45-54
• /
• 2011

A program aiming at predicting dynamic characteristics of a Liquid Rocket Engine(LRE) was developed and examined to trace entire LRE operation. In the startup period, transient characteristics of the propellant flows were predicted and validated with hydraulic tests data. An arrangement of each component for the pipelines was based on an operating circuit of open cycle LRE. The flow rate ratio for the gas generator and the main chamber was determined to mimic that of real open cycle LRE. Individual component modeling at its transient was completed and was integrated into the system prediction program. Essential parameters of the component dynamic characteristics were examined in an integrated fashion.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.41 no.11
• /
• pp.1099-1108
• /
• 2017

Data points obtained by conducting repetitive experiments under identical environmental conditions are, theoretically, required to correspond. However, experimental data often display variations due to generated errors or noise resulting from various factors and inherent uncertainties. In this study, an algorithm aiming to determine valid bounds of input variables, representing uncertainties, was developed using probabilistic and statistical methods. Furthermore, a reliability assessment was performed to verify and validate applications of this algorithm using bolt-fastening friction coefficient data in a sample application.