• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.06a
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• pp.24-31
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• 2004

In order to decommission safely nuclear power plant, it is necessary for the procedure of residual radioactivity investigation in site to provide detailed guidance for planning, implementing, and evaluating environmental and facility radiological surveys conducted to demonstrate compliance with a dose or risk-based regulation. This study presents the procedure of residual radioactivity investigation in decommissioning site - Historical Site Assessment, Scoping Survey, characterization Survey, Remedial Action Support Survey, Final Status Survey - on the basis of MARSSIM(Multi-Agency Radiation Survey and Site Investigation Manual) and investigation cases of decommissioned or decommissioning nuclear power plant.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.19 no.3
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• pp.297-306
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• 2021

In this study, basic strategies for the decommissioning and site remediation of the Fukushima Daiichi Nuclear Power Station (FDNPS) were investigated. Six scenarios were formulated based on two of the three decommissioning strategies of nuclear power plants defined by the International Atomic Energy Agency (IAEA): immediate dismantling and deferred dismantling. A multicriteria decision analysis was performed to analyze the preferences of the options from the viewpoints of the timeframe to complete decommissioning, the resulting waste, the site usability, and the availability of the radioactive waste disposal route. The same six scenarios were applied to both the FDNPS and the nuclear power plants that ceased operation after a normal plant life cycle for comparison. For the FDNPS, the decommissioning project involved fuel debris retrieval, dismantling, and site remediation. The analysis results suggest that the balance between the amount of waste and the time to achieve the end state may be one of the most critical factors to consider when planning the decommissioning and site remediation of the FDNPS.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.9 no.2
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• pp.97-104
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• 1997

A hyperbolic numerical model with multi-directional waves has been used to investigate harbor tranquility in Pohang New Harbor. Comparing numerical results with field data measured at two stations in the harbor, it was found that use of input condition of multi-directional waves is superior to the use of uni-directional waves. Calculations with unidirectional wave input give errors of about 12% at St. P2 and 26% at St. P3, while calculations with multi-directional wave input give errors of 4 % at St. P2 and. 14% at St. P3. Using the input condition of multi-directional waves, we investigate the tranquility of Pohang New Harbor with two layouts : the condition in 1994 when the downtime at the 7th pier was often reported and the condition in 1996 when the 4th disposal site was constructed. The numerical results show that the problem of downtime at the 7th pier cannot be solved by the construction of the 4th disposal site.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.120-124
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• 2009

기후변화로 인한 사회, 경제, 자원, 환경, 수자원 등에 영향분석은 세계적인 연구 트렌드로 자리 잡고 있다. 다양한 모형들이 기후변화 영향을 효과적으로 평가하기 위해서 개발되고 있으나 주로 강우-유출 모형을 통한 유출의 변화 특성을 모의하는데 대부분의 연구가 초점을 맞추고 있다. 그러나 기본적으로 사용되는 강수량자료의 정확한 추정이 기후변화 연구에서 가장 중요하다고 해도 과언이 아니다. 이러한 관점에서 GCM 기후모형으로부터 유도된 기후변화 시나리오로부터 여러 단계로 가공하여 모형의 입력 자료로 사용하기 위한 강수량 자료를 생산하게 된다. 이러한 과정을 총칭해서 Downscaling이라고 한다. 본 연구에서는 기후모형으로 얻은 정보를 유역단위의 수문시나리오로 변환하기 위한 통계학적 Downscaling의 연구이론 변천 상황을 종합적으로 검토하고 각 모형이 갖는 장단점을 분석하고자 한다. 즉, Weather Generator, Single-site Nonstationary Markov Chain, Multi-site Nonstationary Markov Chain, Multi-site Weather State Based Markov Model 등 다양한 모델의 변화 및 진보 과정을 살펴보고 실제 국내 유역에 적용하여 모형의 타당성을 평가해보고자 한다. 이를 위해 IPCC 기후변화 시나리오를 활용하였으며 일강수량자료계열의 특성치, 극치수문량 변동특성 등 기후변화에 따른 영향분석을 일부 실시하여 분석하였다.

• Journal of Biomedical Engineering Research
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• v.14 no.4
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• pp.327-332
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• 1993

Automatic transmission of data from the blood analyzer to the request site is one of the most important part in hospital computerization. We have developed a system that transmits data from the arterial blood gas analyzer to the request site automatically In this system HOST computer, FILE server,'LAN(Local Area Network) , 3270 Emulator and bfulti-port card are integrated with 3 blood gas analyzers(NOVA Inc., USA) which are connected to a single multi-port card in a personal computer. When specimen are collected from tramp)inly sites, they are transferee to the laboratory In the Yonsei Cardiovascular Center After analysis, the result is transmitted to the personal computer via serial commnunication between machine and multi-port card using interrupt method. Then, the patient's information (Name, Patient ID No., etc.) is obtained from the HOST computer througth the emulator. The combined data (patient information & lab data) is transmitted to each request site via LAN automatically These results are stored in the File Server for one year and they can be reviewed anytime. Also, it could be used for the various statistics and the flow chart for clinical research. Additionally, we found thal this system reduces the personal labor.

• Journal of Korea Water Resources Association
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• v.33 no.1
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• pp.99-110
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• 2000

In this study we proposed a simple method for generating multi-site daily rainfall based on the 1-order Markov chain and considering the spatial correlation. The occurrence of rainfall is simulated by a simple 1st-order Markov chain and its intensity to be chosen randomly from the observed data. The spatial correlation between sites could be conserved as the rainfall intensity at each site is to be chosen consistently with the target site in time through generation. It is found that the generated daily rainfall data reproduce genera] characteristics of the observed data such as average, standard deviation, average number of wet and dry days, but the clustering level in time is somewhat loosened. Thus, the lag-I correlation coefficient of the generated data gave smaller value than the observed, also the average lengths of wet run and dry run and the wet-to-wet and dry-to-dry probabilities were a bit less than the observed. This drawback seems to be overcome somewhat by choosing a proper site representing overall basin characteristics or by use of more detailed states of rainfall occurrence.

• Journal of Industrial Technology
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• v.21 no.A
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• pp.17-26
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• 2001

The fatigue strength of SM55C has significantly decreased by 83% compared with atmosphere where distilled exists due to strong erosive action of acid fog. The reason is inferred in a way that strong acid erosive material such as acid fog act and give rise to multi-site crack on the surface. Several fatigue clacks occurred under the acid fog repeat the process of division and unification on the surface and form a long non-propagating crack throughout the circumference of experimented steel. However, in the depth, many parts do not show much trace of unification, and the depth is not as big as the one of normal crack shape. 10% of $CaCl_2$ causes strong erosive reaction to material. Then eventually make the life of fatigue shooter. On the other hand, 20% of $CaCl_2$ beings about oxidized material organic crack closing due to weak erosive reaction.

• Convergence Security Journal
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• v.16 no.4
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• pp.43-51
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• 2016

Nowadays hacked using a security vulnerability in a web application, and the number of security issues on the web site at many sites due to the exposure of personal information is increasing day by day. In this paper, considering the open-source Web Application Security Project at the time of production of the website. Proposed the OWASP TOP 10 vulnerability verification method, by applying the proposed method and then analyzed for improved method and vulnerability to verify the performance of security vulnerability.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.98-100
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• 2016

Coordinated multi-point (CoMP) transmission adopt the Base Stations (BS) cooperatively process User Equipment (UE) connected to multi-points to improve UEs spectral efficiency at the cell edge and eliminate the inter-cell interference (ICI). This technology is important for UEs at the cell edge. Considering the real environment, energy consumption and cost situation, we propose in a Local C-RAN architecture deployment of CoMP and observed its spectral efficiency and Signal-to-Interference and Noise Ratio (SINR) in intra-site CoMP scenarios. Simulation results show that this approach has significantly enhanced than Non-CoMP.

• Korean Journal of Hydrosciences
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• v.7
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• pp.61-75
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• 1996

The purpose of this study is to develop an efficient model for the least cost design of multi-site detention systems. The IDP (Incremental Dynamic Programming) model for optimal design is composed of two sub-models : hydrologic-hydraulic model and optimization model. The objective function of IDP is the sum of costs ; acquisition cost of the land, construction cost of detention basin and pumping system. Model inputs include channel characteristics, hydrologic parameters, design storm, and cost function. The model is applied to the Jung-Rang Cheon basin in Seoul, a watershed with cetention basins in multiple branching channels. The application results show that the detention system can be designed reasonably for various conditions and the model can be applied to multi-site detention system design.