• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.747-753
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• 2009

Planning the construction for a system of bored piles in building foundation engineering is (1) to predict the time duration required to complete all the bored piles with due consideration of relevant engineering factors and site constraints; then (2) to predict the total project time generally by aggregating the predicted working duration for construction of each bored pile. The duration for construction of an individual bored pile results from analyzing various working sequences and different activity duration (such as predrilling, excavation, steelfixing, air-lifting, and concreting, etc.), which is informed by experiences and site records of previous projects. However, determining the project duration for constructing many bored piles on one site is much more complicated than adding up the time duration for individual piles. In practice, project schedules are often found to be unrealistic and incorrect during the construction stage. This is because construction planning is not based on a exhaustive and comprehensive evaluation of site factors, such as site layout plan, site constraints, quality control, environmental control, safety control and logical relationships between different trades. In this paper, we identify those factors based on a foundation engineering site in Hong Kong with ninety-seven bored piles and address their effects on uncertainties in activity time and project time.

• International Journal of Advanced Culture Technology
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• 제9권3호
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• pp.334-344
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• 2021

The study has suggested a way to minimize safety accidents found in on-site firefighting activity by analyzing firefighters' [investigation report on accidents to on-sie workers]. The study result is described as follows. First, the result of [investigation report on on-site workers] shows that while accidents are found to most frequently have occurred to low-ranking firefighting officers such as Sobangsa and Sobanggyo and firefighting officers with career of less than 5 years, fire-extinguishing activity proved to be the most prone to accidents in the category of activity. Second, analysis performed to identify variance between injury extent and area based on cause of accident shows statistically significant variance. In addition, the result of verifying difference in cause of accident based on category of activity shows significant difference with 'falling over and sliding' being the highly likely cause of accident in fire containment and rescue activities and 'reckless move' being highly likely case of accident in emergency activities. Third, the result of verifying factors behind the extent of injury done to on-site workers shows that when accident is caused by 'incomplete behavior', it was found that the extent of injury is substantial. It was also found that rescue activity is accompanied by substantial extent of injury. As a solution to this, the study suggested ways to establish, extend and operate safety-specific curriculum for entrants, develop materials regarding risk prognosis training and explicate training-related regulations, set up safety management measure for a single squad team, upgrade performance of private protection equipment, institutionalize SOP by on-site activity stage, materialize and activate swift rescue team and increase objectivity and proficiency of safety accident investigation.

• International journal of advanced smart convergence
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• 제10권3호
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• pp.131-142
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• 2021

Recently, there has been an active service that provides customized news to news subscribers. In this study, we intend to design a customized news service system through Deep Learning-based Social Network Service (SNS) activity analysis, applying real news and avoiding fake news. In other words, the core of this study is the study of delivery methods and delivery devices to provide customized news services based on analysis of users, SNS activities. First of all, this research method consists of a total of five steps. In the first stage, social network service site access records are received from user terminals, and in the second stage, SNS sites are searched based on SNS site access records received to obtain user profile information and user SNS activity information. In step 3, the user's propensity is analyzed based on user profile information and SNS activity information, and in step 4, user-tailored news is selected through news search based on user propensity analysis results. Finally, in step 5, custom news is sent to the user terminal. This study will be of great help to news service providers to increase the number of news subscribers.

• Nuclear Engineering and Technology
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• 제51권4호
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• pp.1098-1108
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• 2019

Korea's first commercial nuclear power plant at Kori site was permanently shut down in 2017 and is currently in transition stage. Preparatory activities for decommissioning such as historical site assessment, characterization, and dismantling design are being actively carried out for successful D&D (Dismantling and Decontamination) at Kori site. The ultimate goal of decommissioning will be to ensure the safety of workers and residents that may arise during the decommissioning of nuclear facilities and, thereby finally returning the site to its original status in accordance with the release criteria. Upon completion of decommissioning, the resident's safety at a site released will be assessed from the evaluation of dose caused by radionuclides expected to be present or detected at the site. Although the U.S. commercial nuclear power plants with decommissioning experience use different site release criteria, most of them are 0.25 mSv/y. In Korea, both the unrestricted and restricted release criteria have been set to 0.1 mSv/y by the Nuclear Safety and Security Commission. However, since the dose is difficult to measure, measurable concentration guideline levels for residual radionuclides that result in dose equivalent to the site release criteria should be derived. For this derivation, site reuse scenario, selection of potential radionuclides, and systematic methodology should be developed in planning stage of Kori site decommissioning. In this paper, for calculation of a preliminary site-specific Derived Concentration Guideline Levels (DCGLs) for the Nuclear Power Plant site, a novel approach has been developed which can fully reflect practical reuse plans of the Kori site by taking into account multiple site reuse scenarios sequentially, thereby striking a remarkable distinction with conventional approaches which considers only a single site scenario.

• The Korean Journal of Ecology
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• 제21권3호
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• pp.187-193
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• 1998

Seasonal changes of nitrogen fixation and growth characteristics of Melilotus suaveolens population under different light conditions were quantitatively analyzed during growting period. Height growth of M. suaveolens population was promoted after April and the shade (site 2) showed 10-20% increase of height growth in compared with that of sunny (site 1). Seasonal changes of biomass were in creased after March, the biomass at site 1 attained 78.5% that of site 2 in May. Chlorophyll content was maintained high value from March to April but, Chlorophyll content of leaf at site 1 was decreased 11.7% compared to that of site 2 in May. The nitrogen content of each organ of M. suaveolens showed higher value in March and then decreased, the high nitrogen contents of reproductive organ were achieved at the flowering stage at site 1. The root nodule of M. suaveolens population appeared in March and showed maximum value in early June and decreased remarkably after July, the amount of nodule formation of M. suaveolens at site 2 showed higher than that of site 1. The nitrogen fixation activity of root nodule of M. suaveolens initiated with shoot growth and showed maximum value in mid April, and attained second peak in early June and then decreased after July. The total nitrogen fixation of the plant showed higher value at site 2 than that of site 1. From the overall results, M. suaveolens showed increased growth under half-shady, well ventilated barren soil than fertile sunny site.

• Journal of Gastric Cancer
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• 제3권4호
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• pp.201-205
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• 2003

Purpose: Telomerase activity is generally absent in primary cell cultures and normal tissues. Telomerase is known to be induced upon immortalization or malignant transformation of human cells. Telomerase activity can be increased in immature lymphocytes and activated lymphocytes, but it is not detected in the peripheral blood of normal persons. The authors analyzed peripheral blood telomerase from patients of gastric cancer to evaluate the possibility of using it for diagnosis and as a prognostic factor. Materials and Methods: We obtained blood samples from 11 inflammatory patients and 64 gastric cancer patients. The telomerase activity was measured using the [PCR-ELISA] method. The results were correlated with the T, N, M stage, cell differentiation, vascular, neural, and lymphatic invasion, tumor size, and tumor location. Results: In the 11 inflammatory patients, telomerase activity was not detected while in the gastric cancer patients, a positive rate of $28.1\%$ was noted. The peripheral telomerase activity was not related with tumor size, tumor site, lymphatic and vascular invasion, stage, or histologic differentiation. Conclusion: The peripheral blood telomerase activity for patients of gastric cancer can be utilized as a marker for the diagnosis of not only advanced gastric cancer, but also relatively early stage gastric cancer, but not as a prognostic factor.

• 생명과학회지
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• 제22권9호
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• pp.1201-1206
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• 2012

Crlz1 유전자는 B 세포 분화 과정 중 pre-B 세포 분화 단계에서 특이적으로 발현됨이 밝혀져 있다. Crlz1 유전자의 발현과 연관되는 3개의 DNase I hypersensitive site (HSS8, 9, 10)가 Crlz1 유전자의 전사 시작점으로부터 바로 위쪽의 chromatin 상에서 발견되었고, 그 중에서 HSS9/10은 Crlz1 promoter 지역에 해당하며 매우 높은 전사 활성을 가지는 것으로 이미 보고 되었다. 본 연구에서는 앞의 연구에서 더 나아가 HSS8이 Crlz1 promoter의 전사활성을 약 2 배 증가시키는 enhancer의 역할을 하고 있는 현상을 밝혔으며, 또한 HSS8의 위치가 Crlz1 유전자의 전사 시작점을 기준으로 하였을 때 -1055와 -1159 사이, 즉 104 bp 길이의 chromatin DNA 상에 존재하며, 이러한 HSS8의 위치는 luciferase reporter의 활성 측정으로 비교 분석되어진 deletion construct들의 전사 활성에 대한 결과와도 잘 부합되었다.

• 시큐리티연구
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• 제19호
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• pp.105-138
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• 2009

본 연구는 2005년 부산에서 개최된 APEC 행사의 안전활동 문제점을 도출하여 이를 토대로 향후 우리나라에서 개최될 다자간 국제회의 안전활동에 대한 제고방안을 모색해 보는데 그 목적이 있다. 이와 같은 목적을 달성하기 위하여 부산 APEC 행사에 직접 참여한 경찰, 소방, 군, 국정원 등 안전기관의 문제인식 차이를 통하여 제반적인 문제점을 도출해 보고자 한다. 이를 위해 APEC 행사에 차출되어 근접해서 근무한 4개 안전기관 직원을 대상으로 델파이방법에 의해 3차례에 걸쳐 의견을 수렴, 다자간 국제회의의 단계별 구성요소 및 문제점을 파악하고 구성요소별로 문제인식에 대한 통계처리를 실시하였다. 이와 함께 안전기관 전문가 4명과 1 : 1 면담결과를 통하여 다자간 국제회의 행사에 있어서 현장에서 주로 이루어지는 현장활동단계는 어떤 역할을 하며, 그 중요성이 무엇인지를 확인한 결과는 다음과 같다. 현장활동단계에서는 첫째, 인력운영 면에서는 안전기관의 유경험자를 데이터베이스화하여 관리함으로써 차제에 유사한 범국가적인 행사에 차출할 수 있는 시스템을 마련해야 한다. 둘째, 효과적인 폭발물 검측을 위해서는 첨단장비의 도입을 중기계획에 의거하여 차질 없이 수행하고 유관기관과 합동반을 구성하여 주요 취약시설에 대한 점검을 동시에 병행하여야 한다. 셋째, 안전장비의 첨단화를 위해서는 첨단장비 박람회를 통한 장비도입이 사전에 이루어져야 한다. 넷째, 국내 외 정보기관과 행사와 관련된 정보를 공유하고 협조체제를 강화하여 대테러활동에 최선의 대책을 강구해야 한다. 다섯째, 각 기관별로 홍보활동을 경쟁적으로 전개하는 것 보다 상호이해 증진차원에서 홍보기구를 설치하여 대국민 홍보대책을 강구해야 한다. 여섯째, 소방관련 기관과의 협력을 강화하기 위해서는 평시에 전기, 가스, 승강기 등 관련회사와 유기적인 협조체제를 강화하여 행사 시 유관기관과의 통합조정권이 확보될 수 있도록 정책적인 배려가 필요하다. 일곱째, 원활한 취재활동의 편의를 제공하면서도 안전 및 질서유지를 도모하기 위해서는 명확한 보도관리 지침수립이 필요하다.

• 한국안전학회지
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• 제35권3호
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• pp.24-31
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• 2020

The duty of construction clients in WSH (Workplace Safety and Health) system was included in the amendment of Occupational Safety and Health Act (enforced on 16 January 2020), which was estimated the shift of paradigm in the prevention of construction accidents. The purpose of this paper is to introduce the analysis results of construction clients' role in the construction project, which were performed by authors over the recent years in order to impose the duty on construction clients, and to suggest their role according the plan, design, and construction stage. Utilizing the systematic literature review process based on Meta analysis, the related papers were selected. For the selected papers, related domestic and foreign regulations, and other prominent report, the construction clients' role was analyzed by reflecting the experts' advice. Results show that the construction clients should control the designer and contractor for implementing the WHS system during the whole process of the construction project. They should supply sufficient source and time to ensure the workers' safety. In the plan stage, the key role of construction clients is to identify intensively controlled hazard and risk reduction plan and to transfer the results. In the design stage, their key role is to select the designer with the capacity in WSH and to assist the designer for the safety design. The main key role of construction clients in the costruction stage is to select the contractor with specialty in WSH including a contract reflecting the WSH requirement and to check implementation of WSH plan, WSH cost, WSH education, and accident report. In addition, it is thought that the construction clients' participations in the site WSH activity and adjustment of safety and health problem among contractors can be effect in the prevention of construction accidents.

• 전기학회논문지
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• 제63권3호
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• pp.395-403
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• 2014

This paper presents a new approach to improve the signal to noise ratio (SNR) for local seismic disaster preventing system in densely populated area. The seismic data measured in the local site includes various sensing noises (offset or measurement noise) and man-made/natural noises (road and rail traffic noise, rotating or hammering machinery noise, human activity noise such as walking and running, wind/atmospheric pressure-generated noise, etc.). These additive noises are different in time and frequency characters. The proposed method uses 3-stages processing to reduce these different additive noises. In the first stage, misalignment offset noise are diminished by time average processing, and then the second and third stages, coherent/incoherent noises such as man-made/natural noises are suppressed by array stacking. In addition, we derived the theoretical equation of the SNR gain improved by the proposed method. To evaluate the performance of the proposed method, computer simulations were performed with real seismic data and test equipment generated data as the input.