• 복합신소재구조학회 논문집
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• 제5권4호
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• pp.11-17
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• 2014

A progressive failure analysis procedure for composite laminates is completed in here. An anisotropic plastic constitutive model for fiber-reinforced composite material is implemented into computer program for a predictive analysis procedure of composite laminates. Also, in order to describe material behavior beyond the initial yield, the anisotropic work-hardening model and subsequent yield surface are implemented into a computer code, which is Predictive Analysis for Composite Structures (PACS). The accuracy and efficiency of the anisotropic plastic constitutive model and the computer program PACS are verified by solving a number of various fiber-reinforced composite laminates with and without geometric discontinuity. The comparisons of the numerical results to the experimental and other numerical results available in the literature indicate the validity and efficiency of the developed model.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1999년도 가을 학술발표회 논문집
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• pp.194-200
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• 1999

Localized damage to a structure affects its dynamic properties, and much work has been undertaken investigating the variation of natural frequencies, damping ratios and mode shapes. This paper presents a technique based on wavelet transform to detect the existences and locations of structural damages. The procedure operates solely on the mode shape from the damaged structure, and does not require a priori knowledge of the undamaged structure. The procedure is developed using a 32-story shear building model. Applying wavelet transform to the mode shape successfully identifies the location of damage. The procedure is best suited to the mode shape obtained from the fundamental natural frequency. The wavelet coefficients from the higher mode shapes can be used to verify the location of damage, but they are not as sensitive as the wavelet coefficients of the lower mode shapes.

• Bulletin of the Korean Chemical Society
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• 제21권7호
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• pp.697-700
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• 2000

A method of calculating the excess Helmholtz free energy from the average of the bent effective acceptance ratio for two-center-Lennard-Jones liquids has been presented. The bent effective acceptance ratio has been newly composed from the acceptan ce ratio for the potential energy difference between a configuration in the Metropolis Monte Carlo procedure and random virtual configuration generated by the separate parallel Monte Carlo procedure and the Boltzmann factor for half the potential energy difference. The excess Helmholtz free energy was calculated directly from the average of the bent effective acceptance ratio through a single Metropolis Monte Carlo run. Because the separate parallel Monte Carlo procedure was used, this method can be applied to molecular dynamics simulations. For two-center-Lennard-Jones liquids, the average of the bent effective acceptance ratio gave better results than use of the modified effective acceptance ratio in the previous work.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1998년도 Proceedings ICPE 98 1998 International Conference on Power Electronics
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• pp.235-240
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• 1998

A procedure for the optimal design of high quality rectifiers is introduced in this paper. The procedure is capable of producing different optimal designs for the same rectifier based on the objective performance required from that rectifier. A FORTRAN-based computer system designed to solve large-scale optimization problems was used in this work to obtain the optimal designs. The optimization program uses Wolfe algorithm in conjunction with a quasi-Newton algorithm as well as a projected augmented Lagrangian algorithm to solve the highly nonlinear optimization problem. The paper also introduces a detailed analysis and an application of the procedure on a boost-type zero-current switch (ZCS) single-switch three-phase rectifier introduced recently in the literature. The obtained results are compared with popular simulation packages (i. e. PSPICE and SIMCAD) to support the validity of the proposed concept.

• 대한기계학회논문집
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• 제18권2호
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• pp.339-350
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• 1994

This paper presents a method for automatic generation of line balanced assembly sequences based on disassemblability and proposes a method of evaluating an assembly work time using neural networks. Since a line balancing problem in flexible assembly system requires a sophisticated planning method, reasoning about line balanced assembly sequences is an important field of concern for planning assembly lay-out. For the efficient inference of line balanced assembly sequences, many works have been reported on how to evaluate an assembly work time at each work station. However, most of them have some limitations in that they use cumbersome user query or approximated assembly work time data without considering assembly conditions. To overcome such criticism, this paper proposes a new approach to mathematically verify assembly conditions based on disassemblability. Based upon the results, we present a method of evaluating assembly work time using neural networks. The proposed method provides an effective means of solving the line balancing problem and gives a design guidance of planning assembly lay-out in flexible assembly application. An example study is given to illustrate the concepts and procedure of the proposed scheme.

• 한국정보과학회논문지:소프트웨어및응용
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• 제27권4호
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• pp.327-341
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• 2000

본 논문은 프로시저 단위의 온라인 프로그램 교체를 수행하기 위한 일련의 방법들을 제안하고, 제안한 방법을 SUN Solaris 2.6 환경에서 사용자 응용 소프트웨어에 적용하여 검증한다. 구체적으로 본 논문은 동작 중인 소프트웨어의 어드레스 영역 중 교체 대상 프로시저에 해당하는 영역을 직접 새 버전으로 바꾸기 위한 절차와 방법을 제시할 뿐 아니라, 교체 대상 프로시저의 크기가 변화하는 경우에 발생하는 새 버전 프로시저를 위한 공간 할당 문제와 새 버전의 프로시저를 구 버전의 프로세스 어드레스 스페이스에서 올바르게 동작하도록 외부 심벌 리퍼런스를 수정하는 문제에 대한 일관적인 해결책을 제시함으로써, 프로시저 단위의 온라인 프로그램 교체를 가능하게 한다. 제안한 방법은 기존의 운영체제에서 제공하는 서비스만을 이용하여 온라인 프로그램 교체를 수행한다. 또한 제안한 방법에서는 프로시저라는 작은 교체단위를 지원하며 프로세스 어드레스 스페이스상의 필요한 부분만을 직접 수정하므로 온라인 교체에 따른 성능저하가 적다.

• 시큐리티연구
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• 제43호
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• pp.231-257
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• 2015

오늘날 주요 선진국들은 신안보 현실에 부응하여 형사특례 도입 등 관련 법제를 강화하고 있는 추세이다. 이러한 형사특례 절차를 마련하고 있는 것은 안보와 관련된 수사에서는 피의자의 인권이라도 어느 정도 제한할 수밖에 없다는 판단에서 출발한 것이다. 즉, 간첩, 테러 등 안보사범에 대해서 수사 절차를 다르게 적용하는 것은 개인적 보호법익보다는 국가의 법익과 사회적 법익을 우선으로 고려하여 어느 정도 한도에서는 감청을 허용하고 영장주의 예외를 허용하고 증거인멸과 더 큰 테러와 간첩행위에 의한 국가적 손실을 예방하기 위해 변호인 접견권을 제한하거나 테러 혐의자의 가택이나 사무실을 폭넓게 수색하도록 허용하고 있다. 이와 같이 안보사범의 처리에 있어 형사절차의 개선과 강화는 매우 중요하다. 하지만 우리나라는 선진국과 같이 예비와 음모죄를 강화하거나, 내수사 단계에서의 수사여건을 개선하는 등 적극적 노력보다는 일반 형사범의 처벌과정과 거의 차이가 없음을 알 수 있다. 이러한 분위기가 지속된다면 최근의 신안보 현실에서 국가적 위협요인에 대하여 효과적으로 대응하기 어렵다. 이를 개선하기 위해서는 선진국의 안보법제도를 고려하여 우리의 상황에 적절한 형사절차 등의 특례조항을 도입해야 한다. 이 논문에서는 국내 안보사례 분석을 통해 안보형사법제의 개선방안을 논의해 보았다.

• 한국안전학회지
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• 제33권5호
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• pp.21-27
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• 2018

The purpose of this study is to develop a SOP (Standard Operating Procedure) for a distribution board that can monitor the leakage current of a load distribution line in real time. The developed distribution board was fabricated by applying IEC 61439-1. It consists of the distribution board and an alarm device. The work process for making the distribution board was compliant with the KEMC (Korea Electrical Manufacturers Cooperative) regulations. And the AC distribution board range is 1,000 V. In addition, the voltage in DC is less than 1500 V. The distribution board receives a 3-phases and 4-wires power supply system and can supply power to the load of a maximum of 32 single or three phase distribution circuits. Also, leakage current measured on the power distribution board was used by sensors installed. The SOP of the developed distribution board consists of the installation standards for the short circuit alarm device and sensor, the surge protection device, switches and indication lamps, and other devices. The operation procedure was prepared so that each manufacturing step of the distribution board must be confirmed by the persons in charge of preparation, production, quality control and approval before moving forward to the next step.

• 전기학회논문지
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• 제65권3호
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• pp.388-396
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• 2016

Through the correspondence works with international electrotechnical vocabulary(IEV) in the smart grid field and power information technology field, we analyzed cases for discussion of terms and definitions in the IEV and then proposed an advanced procedure and computing system for standardization of International Electronical Committee(IEC) terminologies. The standardization procedure consists of processes for existing terminology, new terminology and correspondent terminology which have different structures. An example of the standardization work of correspondent terminology is given. The standardization computing system are based on the process for terminology extraction, terminology verification and terminology management which could provide the Wikipedia type terminology search function. In order to prevent that there exist multiple terminologies in IEV, the database search system is needed to be developed. We proposed the 'IEV_Term_Search' program which is the database search system. Terminology standardization of different technical committees(TC) and completion of the IEV to promote cooperation between TC 1 and the TCs must be followed by revision and standardization using the standardization computing system.

• Earthquakes and Structures
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• 제13권6호
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• pp.539-549
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• 2017

Existing reinforced concrete frame buildings designed for vertical loads could only suffer severe damage during earthquakes. In recent years, many research activities were undertaken to develop a reliable and practical analysis procedure to identify the safety level of existing structures. The Incremental Dynamic Analysis (IDA) is considered to be one of the most accurate methods to estimate the seismic demand and capacity of structures. However, the executions of many nonlinear response history analyses (NL_RHA) are required to describe the entire range of structural response. The research discussed in this paper deals with the proposal of an efficient Incremental Modal Pushover Analysis (IMPA) to obtain capacity curves by replacing the nonlinear response history analysis of the IDA procedure with Modal Pushover Analysis (MPA). Firstly, In this work, the MPA is examined and extended to three-dimensional asymmetric structures and then it is incorporated into the proposed procedure (IMPA) to estimate the structure's seismic response and capacity for given seismic actions. This new procedure, which accounts for higher mode effects, does not require the execution of complex NL-RHA, but only a series of nonlinear static analysis. Finally, the extended MPA and IMPA were applied to an existing irregular framed building.