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현장계측과 수치해석에 의한 흙막이구조물의 거동 비교분석
Jongtae Woo 한국재난정보학회 2017 한국재난정보학회 논문집 Vol.13 No.3
본 연구는 경사계에 의한 지중수평변위 계측값을 중심으로 수치해석에 적용하기 위한 지반반력계수를 다양한 이론 및 경험식으로 산출하여 비교하였다. 산정된 지반반력계수의 변화에 따라 벽체 최상단에서는 벽체변위의 최소값과 최대값의 차이가 6.80배로 크게 났으나, 최대 변위점에서는 차이는 거의 없는 1.06배로 나타나 지반반력계수의 증분에 비해 변위의 차이는 작으며 전체적으로 비슷한 값을 나타내었다. 또한 최대변위 발생점에서의 변위를 수치해석한 결과와 계측치로 비교한 결과 변위형상은 비슷하게 나타났다. In this study, it is compared various coefficients of subgrade reaction for application of numerical analysis based on measured data by using various theories and empirical formula. The ratio of the maximum and minimum value is 6.80 at the top of wall but it is 1.06 at the maximum displacement point depends on change of calculated coefficient of subgrade reaction. The data of displacement were generally similar considering an increment of a coefficient of subgrade reaction. And the results of comparison of the displacement at the maximum displacement point by numerical analysis and measured data show similar displacement shape.
Jongtae Lee,Kyuhyun Park 한국농식품정보과학회 2017 Agribusiness and Information Management Vol.9 No.2
Abstract1)This study aims to understand why public information systems in agricultural fields have shown lower performances than other industrialized fields and industries and how these problems would be fixed and overcame. To accomplish this research purpose, this study would overview the previous studies on developing agricultural information systems in public sectors and would find out meaningful and considerable factors. This study would accept the methodologies of literature review and systems thinking approaches to understand the relationships among the found factors and to suggest the conceptual research model. Agricultural information system should take care to reduce implement and maintenance costs to reduce the negative relationships between costs and expected service value and between expected service value to perceived service value. Also, it should be understood that impersonal response would reduce the eager to use the services, so the government sectors should consider positively to adopt the concept of CRM even though the government sectors traditionally have ignored its necessity. The failure of public information systems/services may be caused not only by lack of the contents but also by the failure of the persistent post management.
Evaluation of Composted Pig Manure and Organic Fertilizer for Organic Onion Production in Paddy Soil
Jongtae Lee,Heedae Kim,Sangdae Lee,Chiwoong Ro 한국원예학회 2012 원예과학기술지 Vol.30 No.2
A two year study was conducted on the effects of composted pig manure applications on organically managed intermediate-day onion (Allium cepa L.) with mid-season production. The manure application rates were 0, 4.0, 6.0, and 8.0 ton·ha-¹, and accompanied by organic fertilizer with 240 ㎏·ha-¹ nitrogen for all treatments. There was a positive linear effect on the marketable bulb yield with increasing applications of pig manure. However, pig manure rates of 6.0 or 8.0 ton·ha-¹ did not affect the marketable yields or bulb weights at harvest. There was no significant difference between pig manure application rates and mineral concentration or nutrient uptake in onion bulbs. Soil pH and electric conductivity (EC) were lower at harvest compared to preplant soil, while exchangeable potassium and calcium contents increased at harvest. However, there were no significant effects on soil pH, EC, and organic matter or exchangeable cations caused by different pig manure application rates. Mineralized NO₃-N content was not affected by pig manure application rates except at transplanting and 129 day after transplanting. Based on the results of this study, when organic fertilizer is applied at a rate of 240 ㎏·ha-¹ N, 6.0 ton·ha-¹ composted pig manure should be adequate for producing onions using an organic production system.
A Method for Operational Safety Assessment of a Deep Geological Repository for Spent Fuels
Jongtae Jeong,Dong-Keun Cho 한국방사성폐기물학회 2020 방사성폐기물학회지 Vol.18 No.S
The operational safety assessment is an important part of a safety case for the deep geological repository of spent fuels. It consists of different stages such as the identification of initiating events, event tree analysis, fault tree analysis, and evaluation of exposure doses to the public and radiation workers. This study develops a probabilistic safety assessment method for the operational safety assessment and establishes an assessment framework. For the event and fault tree analyses, we propose the advanced information management system for probabilistic safety assessment (AIMS-PSA Manager). In addition, we propose the Radiological Safety Analysis Computer (RSAC) program to evaluate exposure doses to the public and radiation workers. Furthermore, we check the applicability of the assessment framework with respect to drop accidents of a spent fuel assembly arising out of crane failure, at the surface facility of the KRS+ (KAERI Reference disposal System for SNFs). The methods and tools established through this study can be used for the development of a safety case for the KRS+ system as well as for the design modification and the operational safety assessment of the KRS+ system.
Influence Analysis of Environmental Data for the Growth of Paprika
Jongtae Lim,Hyuntae Lee,Seungwoo Cha,Jihyeon Choi,Hwanyong Choi,Sangjun Chung,Seoheui Lee,Hyunjung Hwang,Junhyuck Jang,Christopher RETITI DIOP EMANE,Yuna Kim,Kyoungsoo Bok,Jeonghyun Baek,Jaesoo Yoo 한국콘텐츠학회 2022 한국콘텐츠학회 ICCC 논문집 Vol.2022 No.12