• Nuclear Engineering and Technology
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• v.40 no.5
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• pp.365-374
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• 2008

Dependability-critical systems, such as digital instrumentation and control systems in nuclear power plants, necessitate engineering techniques and tools to provide assurances of their safety and reliability. Determining system reliability at the architectural design phase is important since it may guide design decisions and provide crucial information for trade-off analysis and estimating system cost. Despite this, reliability and system engineering remain separate disciplines and engineering processes by which the dependability analysis results may not represent the designed system. In this article we provide an overview and application of our approach to build architecture-based, dynamic system models for dependability-critical systems and then automatically generate dynamic fault trees (DFT) for comprehensive, tool-supported reliability analysis. Specifically, we use the Architectural Analysis and Design Language (AADL) to model the structural, behavioral and failure aspects of the system in a composite architecture model. From the AADL model, we seek to derive the DFT(s) and use Galileo's automated reliability analyses to estimate system reliability. This approach alleviates the dependability engineering - systems engineering knowledge expertise gap, integrates the dependability and system engineering design and development processes and enables a more formal, automated and consistent DFT construction. We illustrate this work using an example based on a dynamic digital feed-water control system for a nuclear reactor.

• The Journal of the Korea Contents Association
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• v.1 no.1
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• pp.93-99
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• 2001

The widespread use of the Internet brings about the issue regarding intellectual property and copyright. This paper describes DRM (Digital Rights Management) technologies and their related issues. Current approaches on DRM architecture are examined first. Based on the review, we discuss some security issues that would be essential to design security mood and architecture appropriate for DRM. Having these security issues in mind, we propose a new approach on DRM security architecture, based on our trust model.

• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.784-787
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• 1999

This paper describes a direct digital frequency synthesizer using the CORDIC algorithm, which can be implemented efficiently for a digital sinusoid synthesis. To optimize the hardware design parameters, we perform numerical analysis of the quantization effects for the CORDIC-based architecture. A pipelined architecture is employed to obtain a high data throughput,. We estimate and summarize its hardware costs for a variable accuracy, and a CORDIC-based architecture for 9 bit accuracy is emulated in FPGA.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.32A no.12
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• pp.220-228
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• 1995

An optimized 4-stage 12-bit pipelined CMOS analog-to-digital converter (ADC) architecture is proposed to obtain high linearity and high yield. The ADC based on a multiplying digital-to-analog converter (MDAC) selectively employs a binary-weighted-capacitor (BWC) array in the front-end stage and a unit-capacitor (UC) array in the back-end stages to improve integral nonlinearity (INL) and differential nonlinearity (DNL) simultaneously whil maintaining high yield. A digital-domain nonlinear error calibration technique is applied in the first stage of the ADC to improve its accuracy to 12-bit level. The largest DNL error in the mid-point code of the ADC is reduced by avoiding a code-error symmetry observed in a conventional digitally calibrated ADC is reduced by avoiding a code-error symmetry observed in a conventional digitally calibrated ADC is simulated to prove the effectiveness of the proposed ADC architecture.

• Korean Institute of Interior Design Journal
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• v.25 no.1
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• pp.24-34
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• 2016

The notion of materiality in architecture has existed throughout its history, and it has begun to discussed in earnest as an important architectural discourse since early twentieth century, when the Industrial Revolution and its consequent mass-production system has fundamentally changed the means and methods of architectural production. However, this traditional notion of materiality is not fully engaged with today's digital paradigm, and not able to inquire into the complex aspects of contemporary architectural process, because their theoretical and perceptional bases are still remaining in modern era. In this shifting context, this study is intended to develop a new concept of digital materiality which corresponding to contemporary digital and material culture. This paper speculates and argues digital materiality as an active ingredients of contemporary design process as well as a comprehensive logical system that negotiate with various geometric conditions. The purpose of this study is to analyze and investigates the distinctive characteristics of Office dA's architectural design process in the digital realm.

• Journal of The Korean Digital Architecture Interior Association
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• v.11 no.3
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• pp.89-97
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• 2011

Accelerating economic growth since the 1960s, penetration rate of the House of Commons has been increased. However, design competition has been imposed for improve of the qualitative level in modern because it was quantitative increasing. Even though its design quality is improved by introducing design competition, distorting the design is increased for the purpose of election. For that reason, errors of information and design changes are increased. So BIM(Building Information Modeling) is adopted to solve the problems. In this study, BIM process on the basis of the existing design process was to clean up and LoI(Level Of Information) based on the level of information was newly defined. Working-level of the design competition is plan-basic design. LOI level is LOI1-LOI2 in plan and Lol3-LOI4 in basic design. At each step of the operation was to clean up the level of detail and content. Also exchange of data in each area and feedback about content are to clean up.

• Journal of The Korean Digital Architecture Interior Association
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• v.13 no.2
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• pp.27-34
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• 2013

According to current digital and information society, architecture related departments in universities give and educate computer courses to train top-level human resources suiting the needs of the time. The aim of this study is to curriculum of architecture related departments and to use the references for curriculum organization by understanding computer courses for architecture related departments. The results are as follows: (1) There are 100 departments (28.2%) in the field of architecture and 130 departments including an academic system that is the most departments. Also, there are 86 departments (39.8%) in the field of architecture engineering and 117 departments including an academic system. There are 77 departments in the field of interior architecture, which contain 48 departments (62.3%) of two- or three-year bachelor course college. (2) Department in the field of architecture opens a program study course in the second year of the program that is the most courses had been opened. First, most departments selected an order of learning a structure/detail construction techniques of architecture and design skills such as a foundation system and expression of the structure by hand in the first grade and processing it using a computer in the second grade. (3) BIM was opened in only three departments of 31 departments surveyed and was opened in a senior class. The reasons of still lack of BIM are the compatibility deficit of partners such as building structure, building equipment, securing lecturer, and still the dominant point of CAD in the field. (4) Six departments of 31 departments surveyed did not open a program study course as a major. That is to say, it is learned in a basic course or basic liberal arts education requirements (information area) of each department, or in an own program of each department. (5) The program study is only a means to create architectural drawings in department of the field of architecture. Thus, we should remember not only the drawing through the program but also drawing up a floor plan after understanding of methods such as constructional methods, detail drawing, and expression.

• Journal of The Korean Digital Architecture Interior Association
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• v.5 no.2
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• pp.9-14
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• 2005

The analysis system has been needed to pre-evaluate and analyze the right for sunlight and the right for view in a residential environment since the urban high density and high rise residentinal building types have been prevailing these days. The purpose of this study is to propose an digital analysis method to evaluate sunlight and view conditions in a residential environment to improve the system performance in the sense of speed and accuracy. The digital analysis method using the object-oriented 3D CAD system and parametric library is studied and applied in the system and the various outputs of the analysis system makes possible to modify the design with the speed and accuracy as a result of the analysis. The study includes the evaluation for a daylight and view condition of each unit, and the interruption degree to a vicinity environment in terms of sunlight and view conditions comparing before and after construction.

• International Journal of High-Rise Buildings
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• v.7 no.2
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• pp.145-151
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• 2018

Newly-designed high-rise buildings, both in China and abroad, have demonstrated new innovations from the creative concept to the creative method. from the creative concept to the creative method. At the same time, digital technology has enabled more design freedom in the vertical dimension. "Twisting" has gradually become the morphological choice of many city landmark buildings in recent years. The form seems more likely to be driven by the interaction of aesthetics and structural engineering. Environmental performance is often a secondary consideration; it is typically not simulated until the evaluation phase. Based on the research results of "DigitalFUTURE Shanghai 2017 Workshop - Wind Tunnel Visualization", an approach that can be employed by architects to design environmental-performance buildings during the early stages has been explored. The integration of a dynamic form-finding approach (DFFA) and programming transforms the complex relationship between architecture and environment into a dialogue of computer language and dynamic models. It allows the design to focus on the relationship between morphology and the surrounding environment, and is not limited to the envelope form itself. This new concept of DFFA in this research consists of three elements: 1) architectural form; 2) integration of wind tunnel and dynamic models; and 3) environmental response. The concept of wind tunnel testing integrated with a dynamic model fundamentally abandons the functional definition of the traditional static environment simulation analysis. Instead it is driven by integral environmental performance as the basic starting point of morphological generation.

• Journal of The Korean Digital Architecture Interior Association
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• v.9 no.1
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• pp.5-10
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• 2009

Recently, the public offices are going to be an important role of CIP(City Identity Program) and be a center of citizen's community activities. So, the aspect of the universal design (UD), the space performance assessment for a disable user is invaluable to designing the public office spaces. Purpose of this paper is to provide basic data for better design of public office space based on UD(universal design) principle. Conclusion based on the finding are as follows; First, checklist of environmental assessment for public space was composed of 7 basic principles of UD and 3 additional principles(aesthetic appreciation, maintenance and eco-design). Second, as the result of assessment, accessible and inclusive design is more necessary. Third, local characteristics should be developed and managed deliberately as to public space design. As the result of that, public office space design should an important part of reducing the isolation that was caused by physical and social disability. From now on, in public office space design, the integrated and continuous design program that is based on UD principle and eco-design will be necessary.