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A STUDY ON COMPARISON OF VARIOUS KINDS OF CLASSII AMALGAM CAVITIES USING FINITE ELEMENT METHOD (유한요소법을 이용한 수종 2급 아말감 와동의 비교연구)

  • Seok, Chang-In;Um, Chung-Moon
    • Restorative Dentistry and Endodontics
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    • v.20 no.2
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    • pp.432-461
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    • 1995
  • The basic principles in the design of Class II amalgam cavity preparations have been modified but not changed in essence over the last 90 years. The early essential principle was "extension for prevention". Most of the modifications have served to reduce the extent of preparation and, thus, increase the conservation of sound tooth structure. A more recent concept relating to conservative Class II cavity preparations involves elimination of occlusal preparation if no carious lesion exists in this area. To evaluate the ideal ClassII cavity preparation design, if carious lesion exists only in the interproximal area, three cavity design conditions were studied: Rodda's conventional cavity, simple proximal box cavity and proximal box cavity with retention grooves. In this study, MO amalgam cavity was prepared on maxillary first premolar. Three dimensional finite element models were made by serial photographic method. Linear, eight and six-nodal, isoparametric brick elements were used for the three dimensional finite element model. The periodontal ligament and alveolar bone surrounding the tooth were excluded in these models. Three types model(B option, Gap option and R option model) were developed. B option model was assumed perfect bonding between the restoration and cavty wall. Gap option model(Gap distance: $2{\mu}m$) was assumed the possibility of play at the interface simulated the lack of real bonding between the amalgam and cavity wall (enamel and dentin). R option model was assumed non-connection between the restoration and cavty wall. A load of 500N was applied vertically at the first node from the lingual slope of the buccal cusp tip. This study analysed the displacement, 1 and 2 direction normal stress and strain with FEM software ABAQUS Version 5.2 and hardware IRIS 4D/310 VGX Work-station. The results were as followed. 1. Rodda's cavity form model showed greater amount of displacement with other two models. 2. The stress and strain were increased on the distal marginal ridge and buccopulpal line angle in Rodda's cavity form model. 3. The stress and strain were increased on the central groove and a part of distal marginal ridge in simple proximal box model and proximal box model with retention grooves. 4. With Gap option, Rodda's cavity form model showed the greatest amount of the stress on distal marginal ridge followed by proximal box model with retention grooves and simple proximal box model in descending order. 5. With Gap option, simple proximal box model showed greater amount of stress on the central groove with proximal box model with retention grooves. 6. Retention grooves in the proximal box played the role of supporting the restorations opposing to loads.

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Estimation of buckling and collapse behaviour for continuous stiffened plate under combined transverse axial compression and lateral pressure (조합하중을 받는 연속보강판의 좌굴 및 붕괴거동 평가)

  • Park, Joo-Shin;Choi, Joung-Hwan;Hong, Kwan-Young;Lee, Gyoung-Woo
    • Journal of Navigation and Port Research
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    • v.33 no.1
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    • pp.27-33
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    • 2009
  • Estimation of the buckling and ultimate strength of a continuous stiffened plate subjected to combined transverse compression and lateral pressure is of high importance to ensure the safety of ship structures, particularly for the bottom plating under a deep draft condition For example, bottom plating of bulk carriers is subjected to transverse thrust caused by the bending of double bottom structure and the direct action of pressure on the side shells. Most of experimental tests, theoretical approach and numerical researches have been performed on the buckling and ultimate strength behaviour of plates or stiffened plates under combined compression and lateral pressure. With regard to stiffened panels, however, most of studies have been concerned with the load conditions of combined longitudinal thrust and lateral pressure, while fewer studies have been performed for the combined transverse thrust and lateral pressure. In addition, the previous researches are mainly concerned with an isolated rectangular plate simply supported along the all edges, whereas actual ship plating is continuous across the transverse frames and heavy girders. In the present paper, a series of elastoplastic large deflection FEA on a continuous stiffened plate is performed and then clarify the characteristic of collapse mode and explain the effect of transverse compression.

Design and Evaluation of a NIC-Driven Host-Independent Network System (네트워크 인터페이스 카드에 기반한 호스트 독립적인 네트워크 시스템의 설계 및 성능평가)

  • Yim Keun Soo;Cha Hojung;Koh Kern
    • Journal of KIISE:Computer Systems and Theory
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    • v.31 no.11
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    • pp.626-634
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    • 2004
  • In a client-server model, network server systems suffer from both heavy communication and computational loads. While communication channels become increasingly speedy, the existing protocol stack architectures still include mainly three performance bottlenecks of protocol stack processing, system call, and network interrupt overheads. To address these obstacles, in this paper we present a host-independent network system where a network interface card (NIC) is utilized in an efficient manner. First, by offloading network-related portion to the NIC, the host can fully utilize its processing power for other useful purposes. Second, it eliminates the system call overhead, such as context-switching and memory copy operations, since the host communicates with the NIC through its user-level libraries. Third, it a] so reduces the network interrupt operation count as the host handles the interrupt in a segment instead of a packet. The experimental results show that the proposed network system reduces the host CPU overhead for communication system by 68-71%. It also shows that the proposed system improves the communication speed by 11-83% under heavy computational and communication load conditions.

Effect of Glass Fiber-Reinforced Polymer (GFRP) Shear Connector's Shape on Inplane Shear Strength of Insulated Concrete Sandwich Panels (유리섬유복합체를 사용한 전단연결재 형상에 따른 중단열 벽체의 면내전단내력)

  • Jang, Seok-Joon;You, Young-Chan;Kim, Ho-Ryong;Yun, Hyun-Do
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.17 no.4
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    • pp.9-17
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    • 2013
  • This paper describes an experimental program to investigate the shear behavior of insulated concrete sandwich panels (CSPs) with different types of GFRP shear connector. The study included testing of 13 insulated CSP specimens with two types of surface conditions for extruded polystyrene (XPS) insulation and various shapes of shear connectors. All specimens were loaded in direct shear by means of push-out and were consist of three concrete panels, two insulation layer and four rows of GFRP shear connectors. Load-relative slip between concrete panel and insulation response of CSP specimens has been established through push-out shear test. Test results indicate that the surface condition of insulation has a significant effect on the bond strength between concrete panel and insulation. The specimen used XPS foam with 10mm deep slot shows higher bond strength than those used XPS foam with meshed surface. Corrugated GFRP shear connectors show equivalent strength to grid GFRP shear connectors. Cross-sectional area and embedded length of shear connector have a notable effect on overall response and inplane shear strength of the CSP specimens.

Tension Estimation for Hanger Cables on a Suspension Bridge Using Image Signals (영상신호를 이용한 현수교 행어케이블의 장력 추정)

  • Kim, Sung-Wan;Yun, Da-Woon;Park, Si-Hyun;Kong, Min-Joon;Park, Jae-Bong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.24 no.3
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    • pp.112-121
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    • 2020
  • In suspension bridges, hanger cables are the main load-supporting members. The tension of the hanger cables of a suspension bridge is a very important parameter for assessing the integrity and safety of the bridge. In general, indirect methods are used to measure the tension of the hanger cables of a suspension bridge in traffic use. A representative indirect method is the vibration method, which extracts modal frequencies from the cables' responses and then measures the cable tension using the cables' geometric conditions and the modal frequencies. In this study, the image processing technique is applied to facilitate the estimation of the dynamic responses of the cables using the image signal, for which a portable digital camcorder was used due to its convenience and cost-efficiency. Ambient vibration tests were conducted on a suspension bridge in traffic use to verify the validity of the back analysis method, which can estimate the tension of remote hanger cables using the modal frequencies as a parameter. In addition, the tension estimated through back analysis method, which was conducted to minimize the difference between the modal frequencies calculated using finite element analysis of the hanger cables and the measured modal frequencies, was compared with that measured using the vibration method.

Analysis of Trench Slope Stability in Permafrost Regions According to the Equipment Load (동토 파이프라인 매설공사 시 장비하중에 의한 트렌치 안전성 분석)

  • Kim, Jong-Uk;Kim, Jung-Joo;Lee, Jae-Hyuk;Jafri, Turab H.;Yoo, Han-Kyu
    • Journal of the Korean Institute of Gas
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    • v.21 no.3
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    • pp.17-25
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    • 2017
  • Recently, the need of alternate energy resources is increasing due to the global warming issue. The natural gas buried in the extremely cold regions of Alaska and Siberia is of much interest these days. However, the construction standards are needed to be used in extremely cold regions. Particularly, more research work need to be carried out on the trench stability so that the safety of the workers is ensured and the damage to the construction machinery can also be reduced resulting in smaller construction period. In this study, the process for lowering of the pipelines of 30 and 40 in. diameters in the ground conditions (silt and peat) of Yakutsk, Russia was analyzed. The slopes of the ground surface were considered as $0^{\circ}$, $10^{\circ}$, and $20^{\circ}$ to be excavated in summer and winter. The analysis results show that the weight of pipelayer affects the trench stability. Numerical analysis was performed by considering the types of pipelayers, distance between the trench and pipelayer, and the distance between the pipelayers placed longitudinally along the trench. The results show that as the distance between the pipelayer and the trench decreases, the factor of safety of the slope decreases with an increase in the slope of the ground surface. When the slope of the ground surface was $20^{\circ}$, the breakout surface was anticipated to continue from the pipelayer to the trench boundary. In winter season, stability problem of the trench was not observed when the slope of the ground surface was less than $20^{\circ}$.

Simulation for the Estimation of Design Parameters in an Aquifer Thermal Energy Storage (ATES) Utilization System Model (대수층 축열 에너지(ATES) 활용 시스템 모델의 설계인자 추정을 위한 시뮬레이션)

  • Shim Byoung-Ohan
    • Journal of Soil and Groundwater Environment
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    • v.10 no.4
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    • pp.54-61
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    • 2005
  • An aquifer thermal energy storage (ATES) system can be very cost-effective and renewable energy sources, depending on site-specific parameters and load characteristics. In order to develop the ATES system which has certain hydrogeological characteristics, understanding the thermohydraulic process of an aquifer is necessary for a proper design of an aquifer heat storage system under given conditions. The thermohydraulic transfer for heat storage was simulated according to two sets of simple pumping and waste water reinjection scenarios of groundwater heat pump system operation in a two-layered aquifer model. In the first set of the scenarios, the movement of the thermal front and groundwater level was simulated by changing the locations of injection and pumping wells in a seasonal cycle. However, in the second set the simulation was performed in the state of fixing the locations of pumping and injection wells. After 365 days simulation period, the shape of temperature distribution was highly dependent on the injected water temperature and the distance from the injection well. A small temperature change appeared on the surface compared to other simulated temperature distributions of 30 and 50 m depths. The porosity and groundwater flow characteristics of each layer sensitively affected the heat transfer. The groundwater levels and temperature changes in injection and pumping wells were monitored and the thermal interference between the wells was analyzed to test the effectiveness of the heat pump operation method applied.

Development of Robotic System based on RFID Scanning for Efficient Inventory Management of Thick Plates (효율적인 후판 재고관리를 위한 RFID 스캐닝 로봇 시스템 개발)

  • Lee, Kwang-Hyoung;Min, So-Yeon;Lee, Jong-Hee
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.10
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    • pp.1-8
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    • 2016
  • Automation of inventory management in a steel plate factory was a difficult problem unresolved for a long time. And now, it is also necessary to work diligently in the steel industry on efficient inventory management of thick plates. So far, the environmental characteristics of stacked thick plates means it is not easy to apply advanced technology for their automatic identification. In this paper, we propose a thick-plate robotic scanning system based on radio-frequency identification (RFID) that can provide quick and accurate inventory management by acquiring plate information after the scanning automatically recognizes the RFID tags under difficult load conditions. This system is equipped with a crane to move the plates in a pulled-up operation. It is equipped with a plate-only linear dipole antenna only for scanning the position of the plate tag. Only the linear dipole antenna, while moving the x-axis and y-axis information, automatically identifies the tag information attached to the plate. The tag information acquired by the system is used for stockpiling and is managed by steel plate inventory control software. The effectiveness of the proposed system is verified through field performance evaluation. As a result, the recognition rate of the plate tags is 99.9% at a maximum distance of 320 cm. The developed thick-plate antenna showed excellent performance compared to an existing commercial antenna.

Field Appliciability Evaluation of Eco-friendly Mixed Soil (친환경 혼합토의 현장적용성 평가)

  • Park, Kyungsik;Oh, Sewook;Bae, Wooseok
    • Journal of the Korean GEO-environmental Society
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    • v.15 no.2
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    • pp.17-25
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    • 2014
  • In the present study, it were performed an unconfined compression test and a field applicability test according to a mixed ratio of SS, soil type and curing period to analyze strength and deformation characteristic in order to evaluate engineering characteristics of soil mixed pavements using the eco-friendly soil stabilizer (SS). The test results revealed that SS mixed soil shows fast strength development at the initial curing time while 28-day strength amounted for 97% of the final strength. Furthermore, coarse-grained dredged sand (DS) and weathered granitic soil (WGS) have a larger ratio of deformation coefficient with respect to unconfined compressive strength than fine-grained dredged clay (DC) and organic soil (OS). Moreover, a comparison test between natural and forced drying conditions was conducted and test result showed 54% to 67% of strength degradation while having 55% to 63% of strength degradation in the freezing and thawing test result. Finally, a repeated loading test result showed that DS experiences up to 35% of strength reduction compared to initial strength under 10,000 times loading in maximum. Thus, it was validated that an appropriate amount of fine-grained sand is necessary to secure resistance capability to repeated loading.

Reaction Force Analysis on the Journal Bearing of Shafting System with Contra-Rotating Propeller (상반회전 프로펠러 축계 저널 베어링 반력해석)

  • Shin, Sang-Hoon;Lee, Seung-Min
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.10
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    • pp.270-276
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    • 2019
  • According to the International Maritime Organization (IMO) 2020 Regulation, ships operating outside designated emission control areas (ECA) have to use low-sulfur oil with a sulfur content of 0.5% or less by January 2020. To minimize the consumption of high-priced low-sulfur oil, it is urgent to introduce efficient energy-saving devices (ESD), and contra-rotating propeller (CRP) systems are well known to be the most effective one. The shafting system that drives a CRP is composed of an inner shaft and an outer one and has a mutually influential system that is much more complex and heavier than a general shafting system. An initial design was carried out to install a CRP system for the first time in Korea. The purpose of this study is to verify whether the journal bearing meets the classification's design criteria through a bearing reaction force analysis for the classification's approval of the initial design. It is ideal for the thrust of the propeller to act on the center of the shaft, but thrust eccentricity occurs due to the uneven wake caused by the stern shape. Load conditions were applied while considering thrust eccentricity to perform the shaft analysis, and the results were compared with the classification's criteria.