• Title/Summary/Keyword: depth-hybrid

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Bending Performance Evaluation of Hybrid Composite Beam with Low Depth and New Shape (춤이 작은 신형상 고성능 하이브리드 합성보의 휨성능 평가)

  • Kim, Sung Bae;Cho, Seong Hyun;Oh, Kwang Soo;Jeon, Yong Han;Choi, Young Han;Kim, Sang Seup
    • Journal of Korean Society of Steel Construction
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    • v.28 no.3
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    • pp.151-162
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    • 2016
  • This study developed the shape of low depth new shape high performance hybrid composite beam which is taken strengths and compensated the defect of composite beam and hybrid beam. Also, this study performed the monotonic test to evaluate the bending performance of Low depth shape by creating 12 bending specimens. Bending performance test result showed that capacity of the beam was increased stably. Also, it is possible to apply the existing evaluation equation(KBC 2009) of composite beam. Mechanical properties and structural performance of materials are considered when high-strength steel ($F_y=650MPa$) is applied to the bottom plate.

Comparison of Morphological Characteristics and Its Parent Species Hybrid Grouper between a Epinephelus moara ♀ and E. lanceolatus ♂ (자바리(Epinephelus moara ♀)와 대왕바리(E. lanceolatus ♂) 간 교잡종 대왕자바리의 형태 비교)

  • Park, Jong Yeon;Kim, Yong Hwi;Bang, In-Chul
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.53 no.4
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    • pp.572-576
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    • 2020
  • As grouper aquaculture production intensifies worldwide, hybrids are increasingly produced to induce heterosis of traits such as rapid growth and strong environmental adaptability. In this study, we compared the morphological characteristics of a hybrid grouper to those of its parent species Epinephelus moara and E. lanceolatus. The coefficients of external and skeletal traits evaluated using soft X-rays did not differ significantly among groups; however, several patterns were detected among measured traits. The body depth (BD), length of caudal peduncle (LCP), and pre-anal fin length (PAL) of the hybrid were the same as those of E. moara, whereas the pre-pectoral fin length (PPL) and interorbital width (IOW) of the hybrid were the same as those of E. lanceolatus. Traits that did not differ significantly among the three groups included pre-dorsal fin length (PDL), pre-ventral fin length (PVL), length of anal fin (LAF), and length of dorsal fin (LDF), whereas the depth of caudal peduncle (DCP) and snout length (SNL) showed intermediate traits, and eye diameter (ED) was significantly smaller in the hybrid. Therefore, intermediate traits such as DCP and SNL and specific traits such as ED may be used as indices for hybrid classification.

3D Image Construction Using Color and Depth Cameras (색상과 깊이 카메라를 이용한 3차원 영상 구성)

  • Jung, Ha-Hyoung;Kim, Tae-Yeon;Lyou, Joon
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.49 no.1
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    • pp.1-7
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    • 2012
  • This paper presents a method for 3D image construction using the hybrid (color and depth) camera system, in which the drawbacks of each camera can be compensated for. Prior to an image generation, intrinsic parameters and extrinsic parameters of each camera are extracted through experiments. The geometry between two cameras is established with theses parameters so as to match the color and depth images. After the preprocessing step, the relation between depth information and distance is derived experimentally as a simple linear function, and 3D image is constructed by coordinate transformations of the matched images. The present scheme has been realized using the Microsoft hybrid camera system named Kinect, and experimental results of 3D image and the distance measurements are given to evaluate the method.

Load carrying capacity of Structural Composite Hybrid System (Green Frame) (철골 프리캐스트 콘크리트 합성보 성능 분석 연구)

  • Hong, Won-Kee;Kim, Sun-Kuk;Kim, Seung-Il
    • KIEAE Journal
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    • v.10 no.1
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    • pp.25-31
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    • 2010
  • An experimental investigation of composite beams composed of wide flange steel and precast concrete is presented. The bottom flange of the steel section is encased in precast concrete. The composite beams tested in this study were designed to reduce the depth of the slab and beam. The slabs are constructed on top of the edges of the Structural Composite Hybrid System, instead of on top of the steel flange, decreasing the depth of the beams. When concrete is cast on the metal deck plate located on the edges of the precast concrete, the weight of the concrete slabs and other construction loads must be supported by the contacts between the steel and the precast concrete. This interface must not exhibit bearing failures, shear failures, and failures caused by torque due to the loading of the precast concrete. When the contact area between the concrete and the bottom flange of the steel beam is small, these failures of the concrete are likely and must be prevented. The premature failure of precast concrete must not also be present when the weight of the concrete slabs and other construction loads is loaded. This paper presents a load carrying capacity of Structural Composite Hybrid System in order to observe the failure mode. The symmetrically distributed loading that caused the failure of the composite beam was found. The paper also provides design recommendations of such type of composite structure.

Characteristics of Settlement and Scour of Square-Shaped Hybrid Reef according to Placement Types (배치 형태에 따른 사각형 복합 인공어초의 침하 및 세굴 특성)

  • Yun, Daeho;Kim, Yuntae
    • Journal of the Korean Geosynthetics Society
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    • v.16 no.2
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    • pp.1-10
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    • 2017
  • This study carried out several laboratory tests such as water tank settlement test and two-dimensional water flow test to investigate settlement and scour characteristics of a square-shaped hybrid reef which was reinforced with geogrid. In addition, numerical analysis was also performed to find out scour characteristics of the square-shaped hybrid reef with different placement types (type A; straight placement type, type B; zigzag placement type). Laboratory test results indicated that settlement and scouring depth significantly reduced in hybrid reefs reinforced with geogrid, compared with those without reinforcement. Two-dimentional water flow tests and numerical test results also showed that scouring depth and flow velocity of placement type A more decreased than those of type B.

Study on Model Test Technique of Deepwater Moorings: A Hybrid Modeling of A OTEC Mooring System (심해계류 모형시험 기법 연구: OTEC 계류시스템의 혼합형 모델링)

  • Hong, Sup;Kim, Jin-Ha;Hong, Seok-Won;Hong, Sa-Young;Jalihal, Purnima
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.97-102
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    • 2001
  • This paper describes an investigation how to carry out model tests of deepwater moorings exceeding the basin depth range. A hybrid mooring model, a combination of mooring lines scaled model and a couple of linear springs, is taken into account as an equivalent substitute of a full depth mooring system. Such an idea is applied to the model test of an OTEC mooring system to be installed in 1000m deep ocean. A 1/25 scaled model test of surface vessel and the upper part of mooring system is performed at ocean engineering basin. Possibility and limitation of the hybrid mooring modeling is discussed.

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Flexural Behavior of Hybrid Beam of Reduced Story Height (층고 절감을 위한 하이브리드 보의 휨 거동에 관한 실험적 연구)

  • Hong, Sung-Gul;Yang, Dong-Hyun;Jung, Jong-Hyun;Yim, Byung-Ho
    • Journal of the Korea Concrete Institute
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    • v.19 no.5
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    • pp.557-567
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    • 2007
  • In underground parking lots of apartment housing, the story height is increased by $300{\sim}400mm$ because of various ducts for HVAC. In order to reduce this story height, this study proposed the 'hybrid beam', which is composed of PC beam with embedded steel beam and insitu concrete. The depth of the hybrid beam is reduced by 300 mm and then the steel beam is embedded over the length of reduced depth to compensate for the loss of strength. Then, we performed the large-scale structural tests on 9 specimens and investigated the flexural behavior of the specimens. The parameters of tests were the shape of steel beam section, the length of the reduced depth, the stage of construction, the effects of slab and shear connectors. The test results showed that the specimens, after the insitu concrete has cured, has the flexural capacity which exceeds the required design capacity regardless of other parameters. On the other hand, the specimens of construction stage do not have sufficient strength. Based on these results, it is thought that the proposed hybrid beam with reduced depth is applicable to the underground parking lots of apartment housing as long as the support is placed at construction stage.

A Study on the Structure and Characteristics of Light-duty FC Hybrid Vehicle (경부하 FC 하이브리드 자동차의 구조와 특성에 관한 연구)

  • Bong, Tae-Keun
    • Journal of Advanced Marine Engineering and Technology
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    • v.31 no.8
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    • pp.911-917
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    • 2007
  • Global primary energy demand is projected to increase by 1.7% per year from 2000 to 2030. Almost three-quaters of the increase in demand will come from the transportation sector. Fuel cell hybrid vehicle technology has the potential to significantly reduce energy and harmful emissions, as well as our dependence on foreign oil. In this paper, a systematic and logical methodology is developed and improved mainly to design light duty fuel cell hybrid electric vehicle. We investigated structure and characteristics of light duty FC hybrid vehicle carefully. It can easily be expanded to analyze vehicle-to-grid power connectable plug-in NeHEV. A fuel cell hybrid neighbourhood electric vehicle configuration has been studied in-depth utilizing the proposed methodology.

Sensitivity Analysis on Hybrid Element Model for Harbor Oscillation (항만 공진에 대한 복합요소 수치모형의 민감도 분석)

  • 정원무;박우선
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.8 no.2
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    • pp.174-184
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    • 1996
  • In the present study, for fully-open rectangular harbors, sensitivity analyses are made for the major parameters which are relevant to the practical application of a hybrid element model widely used fur the analysis of harbor oscillation. The results show that it is desirable to extend the finite element region to the area in which depth change is not large and that it is appropriate to take the depth of the outer region for analytic solution as the average along the boundary between the two regions. It is expected that the number of Fourier components of the analytic solution may not be important for a constant-depth simple-shaped harbor but its significance may increase for harbors of varying depth and complex geometry. It is found that the effect of incident wave direction is not significant for the first resonance mode but its effect becomes important as the bottom slope increases, especially for the higher resonance modes.

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A Survey of Human Action Recognition Approaches that use an RGB-D Sensor

  • Farooq, Adnan;Won, Chee Sun
    • IEIE Transactions on Smart Processing and Computing
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    • v.4 no.4
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    • pp.281-290
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    • 2015
  • Human action recognition from a video scene has remained a challenging problem in the area of computer vision and pattern recognition. The development of the low-cost RGB depth camera (RGB-D) allows new opportunities to solve the problem of human action recognition. In this paper, we present a comprehensive review of recent approaches to human action recognition based on depth maps, skeleton joints, and other hybrid approaches. In particular, we focus on the advantages and limitations of the existing approaches and on future directions.