• Title/Summary/Keyword: Multipurpose

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The Life Cycle Assessment of Infrastructure considering Environmental Load;A Case Study of Emergency Spillway for Korean Multipurpose Dam (환경부하량을 고려한 토목시설물 전과정평가;국내 다목적댐 비상여수로 시설 사례연구)

  • Kwun, Suk-Hyun;Kim, Sang-Kywi;Jung, Won-Ji;Kim, Sang-Beom
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2006.11a
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    • pp.519-522
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    • 2006
  • This study aims to provide useful information when making a decision for the environmental assessment of infrastructure, based on Life Cycle Assessment(LCA). It estimates environmental load on environmental pollutants that are possible to occur by locations and by types of emergency spillway for Korean multipurpose dam, which is selected as a study case. For this purpose, this study examines the theories of LCA and calculates environmental load on environmental pollutants that generate during life cycle, to apply the suggested infrastructure to the case study of emergency spillway at the multipurpose dam. It also evaluates environmental load of emergency spillway by the estimated result, and draws the optimum alternative that is environmental friendly.

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Development of Agricultural Groundwater Usage Model Considering Multipurpose Water in Jeju Island (다목적 용수를 고려한 제주도 농업용 지하수 이용량 모델 개발)

  • An, Jung-Gi;Song, Sung-Ho;Lee, Dong-Rim
    • Journal of Environmental Science International
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    • v.24 no.4
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    • pp.515-524
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    • 2015
  • The estimation of groundwater usage in Jeju island is important to understand hydrologic cycle system and to plan management of water resource because large amounts of groundwater have been used for agricultural and domestic purpose. The model has been developed to estimate agricultural groundwater usage for garlic at uplands and citrus at orchards raising outdoors using the soil water balance model from FAO 56, respectively. The total amount of water supplied for the crop evapotranspiration and the multipurpose function such as sprout promotion can be simulated by the model. However, due to the discrepancy of water use in initial stage between calculated and observed, the model was calibrated and verified using actual groundwater usage monitoring data for 3.5 years (2011.6 to 2014.12) at three uplands for garlic and three orchards for citrus. Consequently, it would be concluded that the model simulated efficiently actual water usage in that root mean square (RMS) and normalized RMS of the validation stage were less than 8.99 mm and 2.43%, respectively, in two different conditions.

Estimation of Optimal Hydro-Power Supply Amount of Yongdam Multipurpose Dam for the Contract on the Free-Competition Market (자유경쟁 시장 내에서 용담다목적댐 발전소의 최적 계약가능 공급량 평가)

  • Yoo, Ju-Hwan
    • Journal of Korea Water Resources Association
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    • v.38 no.1
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    • pp.25-35
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    • 2005
  • Nowaday the amount of water resource to generate the hydro-power energy has decreased as that of the water supply has increased. In case that the national market of the energy will be in free competition, the energy producer need to suggest the amount of the optimal supply with the hydrological reliability for a deal. In this study the optimal reservoir operation was performed by the linear programming and the optimal reliabilities of inflows and the power supply were obtained by the one dimensional search technique to estimate the energy with the optimal inflow reliability which the power system of the Yongdam multipurpose dam in Geum river can produce. And the main results were presented.

A Study on Optimal Design of Single Periodic, Multipurpose Batch Plants

  • Rhee, In-Hyoung;Cho, Dae-Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.3 no.1
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    • pp.10-19
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    • 2002
  • The purpose of this paper is to describe the design of a general multipurpose batch process or plant in terms of a series of mathematical programing models, and to develop approach solution methodologies. The proposed model for a single period is based on the formulation (MINLP; Mixed Integer Nonlinear Programming) of Papageorgaki and Reklaitis [1], but was linearized (MILP; Mixed Integer Linear Programming) so as to obtain an exact and practical solution, and to allow treatment of uncertainties to be considered in expanding the plant. As a solution strategy a modified Benders' Decomposition was introduced and was tested on three example problems. The optimizing solver, OSL code provided by the IBM Corporation, was used for solving the problems. The solution method was successful in that it showed remarkable reduction in the computing times as compared with the direct solution method.

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INTERFACIAL MORPHOLOGY BETWEEN DENTIN AND ADHESIVES ACCORDING TO TREATMENT OF DENTIN SURFACE OF CERVICAL ABRASION LESION (치경부 마모병소의 상아질 표면처리 방식에 따른 상아질과 접착제 간의 계면 양상)

  • Lee, Yong-Hee;Lee, Hee-Joo;Hur, Bock
    • Restorative Dentistry and Endodontics
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    • v.26 no.1
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    • pp.51-63
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    • 2001
  • In order to know the effect of dentin bonding agents on the restoration of cervical abrasion, Scotchbond Multipurpose Single Bond and Clearfil Liner Bond 2 were used in 51 teeth with abrasion lesion and normal teeth. The surface structure and dentinal tubules of acid etched dentin and resin replica were examined using scanning electron microscopy. The interfacial morphology between dentin and adhesives was investigated by confocal laser scanning microscopy. Following results were obtained. 1. The hybrid layer and resin tag of the dentin showing cross-sectional surface of dentinal tubules are thicker and longer than those of dentin showing oblique surface of dentinal tubules. 2. The sclerotic cast was frequently observed in dentinal tubule, and the cast looked like cuboidal or rhomboidal-shaped crystals clumped from outer side to inner side. 3. The formation of hybrid layer and resin tag was the most prominent in Scotchbond Multipurpose group, whereas Clearfil Liner Bond 2 group showed very poor formation. The formation of hybrid layer and resin tag in Single Bond group was less than Scotchbond Multipurpose group.

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Simulation on Energy Consumption in the Summer Season Operation of primary HVAC system for Multipurpose Building Complex (다목적 복합건물의 하절기 열원기기 운전시 소비전력에 관한 시뮬레이션)

  • Suh, Jae-Kyoung;Choi, Seung-Gil;Kang, Chae-Dong
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.903-908
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    • 2006
  • Building energy simulation has become a useful tool for predicting cooling, heating and air-conditioning loads for facilities. It is important to provide building energy performances feed back to the mechanical and electrical system operator and engineer for energy conservation and maintenance of building. From this research, we set up the typical weather data of location, basic description of building, geometric modelling data and the specification of Installed primary HVAC system for establishing the simulation model about energy consuming that take place in multipurpose building complex. The simulation tool of building energy - EnergyPlus (DOE and BLAST based simulation S/W), it has been used and accomplished calculations and analyses for evaluating the effect of the system types and operating condition of central HVAC plant on the building energy consumption. In this paper, we offer comparison and simultaneous results those involve electricity consumption pattern and amount between actual operation versus EnergyPlus simulation to the object building during summer season.

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Design of Multipurpose Phantom for External Audit on Radiotherapy

  • Lim, Sangwook
    • Progress in Medical Physics
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    • v.32 no.4
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    • pp.122-129
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    • 2021
  • Purpose: This study aimed to design a multipurpose dose verification phantom for external audits to secure safe and optimal radiation therapy. Methods: In this study, we used International Atomic Energy Agency (IAEA) LiF powder thermoluminescence dosimeter (TLD), which is generally used in the therapeutic radiation dose assurance project. The newly designed multipurpose phantom (MPP) consists of a container filled with water, a TLD holder, and two water-pressing covers. The size of the phantom was designed to be sufficient (30×30×30 cm3). The water container was filled with water and pressed with the cover for normal incidence to be fixed. The surface of the MPP was devised to maintain the same distance from the source at all times, even in the case of oblique incidence regardless of the water level. The MPP was irradiated with 6, 10, and 15 MV photon beams from Varian Linear Accelerator and measured by a 1.25 cm3 ionization chamber to get the correction factors. Monte Carlo (MC) simulation was also used to compare the measurements. Results: The result obtained by MC had a relatively high uncertainty of 1% at the dosimetry point, but it showed a correction factor value of 1.3% at the 5 cm point. The energy dependence was large at 6 MV and small at 15 MV. Various dosimetric parameters for external audits can be performed within an hour. Conclusions: The results allow an objective comparison of the quality assurance (QA) of individual hospitals. Therefore, this can be employed for external audits or QA systems in radiation therapy institutions.

Multiple characteristic response damage analysis of large-span space structures based on equivalent damping ratio

  • Wei, Jun;Yang, Qingshun;Zhou, Lexiang;Chen, Fei
    • Earthquakes and Structures
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    • v.23 no.4
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    • pp.339-352
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    • 2022
  • Due to the large volume and generally as a public building, the damage of large-span space structures under various non-conventional loads will cause greater economic losses, casualties, and social impacts, etc. Therefore, it is particularly important to evaluate the seismic performance of large-span space structures. This paper taked a multipurpose sports center as an example and considered its synergistic deformation based on the method of equivalent damping ratio. Furthermore, The ABAQUS software was used to analyze the time-history and energy response of the multipurpose sports center under the action of rare earthquakes, and proposed a quantitative damage index to assess the overall damage of the structure. Finally, the research results indicated that the maximum inter-story drift ratio of the multipurpose sports center under the action of rare earthquakes was less than its limit value. The frame beams presented different degrees of damage, but the key members were basically in an elastic state. The bearing capacity did not reach the limit value, which satisfied the intended seismic performance target. This study taked an actual case as an example and proposed a relevant damage evaluation system, which provided some reference for the analysis of the seismic performance of large-span space structures.

Fracture mechanics analysis of multipurpose canister for spent nuclear fuels under horizontal/oblique drop accidents

  • Jae-Yoon Jeong;Cheol-Ho Kim;Hune-Tae Kim;Ji-Hye Kim;Yun-Jae Kim
    • Nuclear Engineering and Technology
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    • v.55 no.12
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    • pp.4647-4658
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    • 2023
  • In this paper, elastic-plastic fracture mechanics analysis is performed to determine the critical crack sizes of the multipurpose canister (MPC) manufactured using austenitic stainless steel under dynamic loading conditions that simulate drop accidents. Firstly, dynamic finite element (FE) analysis is performed using Abaqus v.2018 with the KORAD (Korea Radioactive Waste Agency)-21 model under two drop accident conditions. Through the FE analysis, critical locations and through-thickness stress distributions in the MPC are identified, where the maximum plastic strain occurs during impact loadings. Then, the evaluation using the failure assessment diagram (FAD) is performed by postulating an external surface crack at the critical location to determine the critical crack depth. It is found that, for the drop cases considered in this paper, the principal failure mechanism for the circumferential surface crack is found to be the plastic collapse due to dominant high bending axial stress in the thickness. For axial cracks, the plastic collapse is also the dominant failure mechanism due to high membrane hoop stress, followed by the ductile tearing analysis. When incorporating the strain rate effect on yield strength and fracture toughness, the critical crack depth increases from 10 to 20%.

SHEAR BOND STRENGTH OF LUTING CEMENTS TO DENTIN TREATED WITH RESIN BONDING AGENTS (레진접착제를 도포한 상아질에 대한 합착용 시멘트의 전단결합강도)

  • Kim, Kyo-Chul;Choi, Boo-Byung
    • The Journal of Korean Academy of Prosthodontics
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    • v.36 no.1
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    • pp.26-49
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    • 1998
  • The purpose of this study was to confirm the formation of hybrid layer and resin tags in dentin tissue and the possibility of bonding between luting cements used for the prosthesis and the resinous surface coated with resin bonding agents to prevent the dentin hypersensitivity after abutment preparation. Some resin bonding agents, which may have the possibility of bonding with polyacrylic acid as a liquid ingredient of polycarboxylate and glass ionomer cements, were selected. All-Blond desensitizer containing NTG-GMA and BPDM, Scotch-Bond Multipurpose plus containing HEMA, and XR-bond containing organophosphate were selected as a coating agent. Dental cements were zinc phosphate, polycarboxylate, and glass ionomer cement. After the exposed dentin surface of premolars was ethced with 10% phosphoric acid and coated with resin bonding agents, the morphology of treated surfaces and the resin tags and hybrid layers on sectioned surfaces were observed by SEM. Shear bond strength between the resin bonding agents and 3 kinds of cements was measured 24 hours after bonding. On the debonded surfaces of the shear bond strength tested specimens, the cement tags and the bonding sites between the resin materials and cements were examined by SEM. Following conclusions were drawn : 1. Coating of dentin with resin bonding agents had no effect on the shear bond strength of zinc phosphate cement. 2. Both of polycarboxylate and glass ionomer cements showed the increased shear bond strength by the dentinal coating with Scotch-Bond Multipurpose plus containing HEMA. However, in the case of dentinal coating with some agents containing NTG-GMA and BPDM or organophosphate, polycarboxylate cement exhibited the lowered shear bond strength, and glass ionomer cement showed the unchanged shear bond strength. 3. Complete obstructions of dentinal tubules were observed on the dentin coated with All-Bond desensitizer or XR-bond, but distinct shape of the orifices of dentinal tubules was observed consistently on the dentin coated with Scotch-Bond Multipurpose plus. 4. The hybrid layer was thickest on the dentin coated with All-Bond desensitizer, and the length of resin tags was longest on the dentin coated with Scotch-Bond Multipurpose plus. 3. On the debonded specimens which had been bonded with polycarboxylate cement or glass ionomer cement after coating with Scotch-Bond Multipurpose plus, the cement tags and the bonding sites between the resinous surface and the cements could be examined.

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