• Journal of Internet Computing and Services
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• v.5 no.3
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• pp.87-98
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• 2004

There are several types of distributed subscribers network using Asymmetric Digital Subscriber Line (ADSL), Very high-bit rate Digital Subscriber Line (VDSL), and Data Over Cable Service Interface Specifications (DOCSIS), The efficient and concentrated network management of those several distributed subscribers networks and resources require the general information model of network, which has abstract and conceptional managed objects independent of type of network and its equipment to manage the integrated subscriber network, This paper presents the general Internet subscribers network modeling framework using RM-ODP (Reference Model Open Distributed Processing) to manage that network In the form of integrated hierarchy, This paper adopts the object-oriented development methodology with UML (Unified Modeling Language) and designs and implements the HFC network of DOCSIS as an example of the subscriber network.

• Korean Journal of Construction Engineering and Management
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• v.6 no.4 s.26
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• pp.80-90
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• 2005

Activity durations retain probabilistic and stochastic natures due to diverse factors causing the delay or acceleration of activity completion. These natures make the final project duration to be a random variable. These factors are the major source of financial risk. Extending the Stochastic Project Scheduling Simulation system (SPSS) developed in previous research; this research presents a method to estimate how the final project duration behaves when activity durations change randomly. The final project cost is estimated by considering the fluctuation of indirect cost, which occurs due to the delay or acceleration of activity completion, along with direct cost assigned to an activity. The final project cost is estimated by considering how indirect cost behaves when activity duration change. The method quantifies the amount of contingency to cover the expected delay of project delivery. It is based on the quantitative analysis to obtain the descriptive statistics from the simulation outputs (final project durations). Existing deterministic scheduling method apply an arbitrary figures to the amount of delay contingency with uncertainty. However, the stochastic method developed in this research allows computing the amount of delay contingency with certainty and certain degree of confidence. An example project is used to illustrate the quantitative analysis method using simulation. When the statistical location and shape of probability distribution functions defining activity durations change, how the final project duration and cost behave are ascertained using automated sensitivity analysis method

• The Korean Journal of Archival Studies
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• no.24
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• pp.3-40
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• 2010

In recent time, archival science has been in charge of positively preserving and handling with valuable things, as well as managing established ones, However, even though several archival methodologies that manage contexts among tasks, organizations and subjects exist nowadays, there is a lack of theoretical methodology on archiving focusing on valuable things. In this sense, this article dealt with a theoretical methodology which carries out archiving valuable things and represents it based on the value of records. Also, this paper, which covers a methodology that carries out archiving and representing one focusing on the value of the one to preserve, is divided into three chapters: putting in, managing, and viewing. To begin with, in the chapter of purring in, the methodology of documentation based on a strategy to distinguish and represent the value of the valuable things were explained. In addition, the article tried to explain the definition of how the valuable things based on the value of it can be put in, and presented how to divide the one for representation into the objet and the activity so as to provide an effective approach. At the same time, as this paper took an approach to the value of the one, it proposed a way to be able to do archiving effectively by applying a representation unit which has its own value. Secondly, in the chapter of managing, representation class and metadata for managing with a representable structure was considered. Metadata categories were illustrated in order to present the class from individual records to final representation valuable things and to make representation with ease. Furthermore, in the chapter of viewing, the process of representation using theoretically archived records was explained. In fact, viewing is the descriptive domain in general, yet this paper focused on the conceptional part. As a consequence, in this paper, a series of process was considered, which starts from how the subject of representation was archived to managing it. Moreover, the process has a meaning by itself in that it gives a practical method to be applied. Finally, the paper suggested that the argumentation on representation be expanded in the field of archival science so as to present theoretical grounds in this sort of work.

• Journal of the Korea institute for structural maintenance and inspection
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• v.23 no.6
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• pp.45-52
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• 2019

Steel corrosion due to carbonation in RC (Reinforced Concrete) structures easily occurs in urban cities with high CO₂ concentration. RC structures are always subjected to external loading with various boundary conditions. The induced stress level causes changes in diffusion of harmful ion like CO₂. In this work, a quantification of carbonation progress with stress level is carried out and carbonation prediction is derived through the relations. Determining the design parameters like cover depth, CO₂ diffusion coefficient, carbonatable materials, and exterior CO₂ concentration as random variables, service lifes under carbonation with design parameter's variation are obtained through MCS(Monte Carlo Simulation). Additionally the service life with different stress level is derived and the results are compared with those from deterministic method. Cover depth and cement hydrates are evaluated to be very effective to resist carbonation, and the proposed method which can consider the effect of stress on service life can be applied to maintenance priority determination.

• The Bulletin of The Korean Astronomical Society
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• v.45 no.1
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• pp.55.3-56
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• 2020

유구한 전통을 배경으로 우리나라는 유네스코 세계기록유산을 세계 4위, 아시아 1위로 등재하여 기록물의 가치를 국제적으로 인정받고 있다. 이제는 세계 기록유산 16건이라는 등재 수량을 넘어, 활용도 증진을 통한 명실상부 질적 차원의 우수 세계 기록유산 보유국가로 성장해야 할 시기를 맞고 있다. 이러한 측면에서 기록유산의보편적 접근과 활용의 증진을 목적으로 하는 국제기록유산센터(ICDH, International Centre for Documentary Heritage)의 2019년 청주시 유치는 시사하는 바가 크다. 또 정부가 세계 기록유산의 다양한 활용 제고를 위한 지자체 협업 사업을 지원하기 시작한 것도 유의할만하다. 그러나 한국 천문학 분야에서는 세계 기록유산이 한 건도 지정되지 않아 우리나라의 우수한 과학적 성취가 담긴 사료들은 알려지지 않고 있으며, 체계적인 관리·보존도 미비한 상태다. 이에 이 연구는 한국 천문학 기록자원의 세계 기록유산 발굴과 등재 및 등재 이후 활용 증진을 위한 아웃리치 서비스의 방법론을 제언하는 데 목적을 가지며 다음 기획론을 제시하고자 한다. 먼저 한국 천문학 기록자원의 세계 기록유산 발굴을 위하여 유네스코의 등재평가기준과 참고할만한 등재과정의 선행사례를 분석한다. 다음으로, 등재 이후 정·관·학 협업의 체계적 관리보존과 공유체계를수립하는 방안을 모색하고자 한다. 이를 위하여 소장처와협업체간 분쟁의 소지가 될 수 있는 저작권 등 위험 요소와 참고할만한 국내외 협업의 선진사례를 분석한다. 마지막으로 한국 천문학계의 요구와 현실에 부합하는 기록학적방법론을 분석하여 한국 천문학 분야 세계 기록유산의 아웃리치서비스 방안을 제언하고자 한다. 이 연구는 천문학 분야에서 망실·훼손될 수 있는 기록 자원을 발굴하는 계기를 세계 기록유산에서 찾아, 천문학계에 새로운 연구의 장(場)을 창출하는 선순환을 도모했다는 점에서 의의가 있다. 그러나 선험적 기획이므로 과정상 발생할 수 있는 변수의 대처 방안과 유의성 분석 등 연구 결과 검증에는 한계가 있다. 향후 한국 천문학과의 협업으로 세계 기록유산과 관련한 사료 발굴과 가치 고증 등 학술적 이론 검증을 이어나가 다양한 학제 간 연구로 심화하길 기대한다.

• Journal of Korean Society of societal Security
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• v.1 no.2
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• pp.79-85
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• 2008

In this study, a new procedure (Unified Dynamic Analysis Method) to evaluate the dynamic responses a bridge under earthquakes is proposed, which is not only considering the bridge motions but also the soil layer motions nearby the bridge footing in order to include the soil-structure interactions. lt is found that the dynamic responses of the whole bridge systems can be properly evaluate from using the proposed UDAM. The properties of the soil layers where the bridge is located can be included into the seismic analysis, and the multi-seismic excitations can also be considered easily.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.3
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• pp.1091-1098
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• 2012

From the perspective of risk management, financial organization that have issued ELW require an efficient hedging methodology due to recently increased trade volume of ELW. This study presents an ELW hedging methodology using artificial neural network(ANN) to minimize hedging costs. The performance of the presented methodology in this study is examined by analysis utilizing the prices and volatilities of underlying assets, risk free interest rates, and maturities and computational experiments show that the proposed method is superior to existing dynamic delta hedging(DDH) technique in terms of hedging costs ranged from 25% to 250%.

• Journal of the Korean Society for Railway
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• v.19 no.4
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• pp.547-554
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• 2016

This study considered how to estimate the deterioration rate of the track quality index, which represents track geometric irregularity. Most existing studies have used a simple linear regression and regarded the slope of the regression equation as the progress rate. In this paper, we present a Bayesian approach to estimate the track irregularity progress. This Bayesian approach has many advantages, among which the biggest is that it can formally include the prior distribution of parameters which can be derived from historic data or from expert experiences; then, the rate can be expressed as a probability distribution. We investigated the possibility of applying the Bayesian method to the estimation of the deterioration rate by comparing our bayesian approach to the conventional linear regression approach.

• Journal of the Korean Society for Railway
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• v.11 no.5
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• pp.433-440
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• 2008

Virtual construction methodology enables to construct project facility from design phase to construction phase in 3D virtual environment. It is a technique that can solve problems of construction in virtual construction process. This study suggests some methodologies of virtual construction and developed a system for a railway station in Honam express railway project based on suggested methodologies. This study developed layout review and layer simulation functions. Those functions can improve the effectiveness of 3D simulation and the virtual construction system can be used as a verification tool for construction process of various construction projects.

• Journal of the Korea Society of Computer and Information
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• v.7 no.1
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• pp.94-102
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• 2002

In this paper, we present a forecasting model for the spectrum demand which will be used for the mid/long-term spectrum forecasting in Korea. In specific, we present the bottom-up model with considering the customer not the previous top-down method. The Proposed model consists of service definition. classification of service characteristics, drawing representative service characteristic , forecasting of service demand, mapping with spectrum resource, verification and spectrum forecasting. The carried actions in each step is described in detail. For the validation of the model an example for the PCS environments is shown. traverse stepping stones for a variety of legitimate reasons.