• 제목/요약/키워드: H형

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Investigation of H model blended e-learning technique in enhanced effectiveness of class learning (대학 강의실 수업의 효과성 향상을 위한 H형 블렌디드 이러닝 적용 효과 분석)

  • Choi, Byongsu;Yoo, Sang-Mi
    • The Journal of Korean Association of Computer Education
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    • v.16 no.3
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    • pp.49-60
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    • 2013
  • This study is aimed to investigate that the blended e-learning could enhance the effectiveness compared to the conventional lecture performed in classroom. At first, both the CbE(Class based E-learning) and the EbC(E-learning based Class) mode have been generated in blended e-learning operation method following the process which analyze the various studies of interest. In addition, the instruction structures of Z Type(Zigzag model) and H-Type(Ladder model) were established as proposed model. The H-Blended e-learning based on CbE mode was introduced in the Excel Spread Sheet subject which held in A University to achieve the goal of this study. Learners were categorized and belonged to either the group 1(over 50% of attendance in cyber lecture) or the group 2(the rest of them). The data analysis was performed with $x^2$-test, t -test to compare the achievement of study between groups. The t -test result showed that the academic achievement in learning with group 1 was statistically significant than the learner in group 2. The effectiveness of the blended e-learning has been proved as the logistic regression analysis showed that the rate of the attendance in the cyber lecture functioned as indicator that enable to predict the acceptance.

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Biaxial Interaction and Load Contour Method for Reinforced Concrete C- and H-shaped Structural Walls (C형 및 H형 철근콘크리트 구조벽체의 2축 상호작용과 등하중법)

  • Nam, Hye-Sung;Eom, Tae-Sung
    • Journal of the Korea Concrete Institute
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    • v.29 no.2
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    • pp.189-200
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    • 2017
  • Nonplanar structural walls with C-shaped and H-shaped sections have been used as an efficient lateral force-resisting system for building structures. Since the nonplanar walls are subjected to axial load and bending moments about two orthogonal axes, complicated section analysis is required for flexure-compression design. In the present study, a straightforward design method for biaxially loaded C- and H-shaped walls was proposed by modifying the existing load contour method for columns with symmetric solid sections. For this, a strain compatibility section analysis program that can calculate biaxial moment strengths of arbitrary wall section was developed and its validity was verified by comparing with existing test results. Then, through parametric study, the interaction of biaxial moments at constant axial loads in prototype C- and H-shaped walls was investigated. The results showed that, due to unsymmetrical geometry of the wall sections, the biaxial interaction was significantly affected by the moment directions and axial loads. From those investigations, non-dimensional contour equations of the biaxial moments at constant axial loads for C- and H-shaped walls were suggested. Further, design examples using the proposed contour equations were given for engineering practice.

Cyclic Loading Test on Connection of SRC Column-Composite Beam Consisting of H-Section and U-Section Members (SRC기둥-H형단면과 U형단면으로 구성된 합성보 접합부의 반복가력실험)

  • Kim, Young Ju;Bae, Jae Hoon;Ahn, Tae Sang;Kim, Jin Won;Ryu, Hong Sik
    • Journal of Korean Society of Steel Construction
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    • v.26 no.4
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    • pp.263-275
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    • 2014
  • In this study, connection of steel reinforced concrete(SRC) column and composite beam which consists of H-section and U-section members were tested under cyclic loading. An essential point of the composite beam is the structural performance of welded joint between the H-section and the U-section members. To improve the structural performance of joint of two beam members, vertical stiffeners, trapezoidal stiffeners, and top bars were used. Five full-scaled specimens were designed to study the effect of a number of parameters on cyclic performance of connections such as H-section beam size($H-500{\times}200{\times}10{\times}16$, $H-600{\times}200{\times}11{\times}17$), the presence of stiffeners and top bars, and the presence of no weld access hole(WAH) method. Based on the test results, deformation capacity of the specimens with H-500 series beam and H-600 series beam were 4% and 3% rotation angle, which is the requirement for the Special Moment Frame and Intermediate Moment Frame(IMF), respectively. Test result showed that deformation capacity of connection with stiffeners and top bars is greater than that of connection without stiffeners and top bars. Finally, energy dissipation capacity and strain profile of specimens were summarized.

Free Vibration Analysis of Composite H-Type Cross-section Beams (복합재료 H형 단면 보의 자유진동 해석)

  • Kim, Sung-Kyun;Song, Oh-Seop
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.5
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    • pp.492-501
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    • 2010
  • Equations of motion of thin-walled composite H-type cross-section beams incorporating a number of nonclassical effects of transverse shear and primary and secondary warping, and anisotropy of constituent materials are derived. The vibrational characteristics of a composite thin-walled beam exhibiting the circumferentially asymmetric stiffness system(CAS) and the circumferentially uniform stiffness system(CUS) are exploited in connection with the bending-transverse shear coupling and the bending-twist coupling resulting from directional properties of fiber reinforced composite materials.

PALATOGRAPHIC STUDY ON MALOCCLUSION PATIENTS IN FRICATIVE SOUNDS (구개도(口蓋圖)에 의(依)한 부정교합자(不正咬合者)의 마찰음(摩擦音)에 관(關)한 연구(硏究))

  • Im, Chul-Joong
    • The Journal of Korean Academy of Prosthodontics
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    • v.8 no.1
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    • pp.56-64
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    • 1968
  • 저자(著者)는 구개도(口蓋圖)에 의(依)하여 한국어(韓國語) 마찰음(摩擦音)의 라, 사, 자, 차 사행(四行), 도합(都合) 40음(音)에 대(對)한 정당교합자(正堂咬合者) 오인(五人)과 부정교합자(不正咬合者) 십칠인(十七人)의 발음(發音)을 조사(調査)하여 다음과 같은 결과(結果)를 얻었다. 1) 라, 사, 자, 차 사행(四行)의 구개도(口蓋圖)는 V, H 및 C형(型)을 나타낸다. 2) 라행(行)의 구개도(口蓋圖)는 교합군(咬合群)에 관계(關係)없이 주(主)로 H형(型)을 보인다. 라행(行)에 있어서 전치(前齒)와 접촉부위간(接觸部位間)의 거리는 과개교합군(過蓋咬合群)에서 크고, 반대교하군(反對咬合群)에서는 작다. 3) 사행(行)은 주(主)로 V형(型)을 보이며 반대교합군(反對咬合群)에서만 C형(型)이 1/3정도(程度) 나타난다. 반대교합군(反對咬合群)에서의 V형(型)은 그 접촉부위(接觸部位)가 구치부(臼齒部)로 갈수록 두터워 진다. 4) 자, 차행(行)의 구개도(口蓋圖)는 라, 사행(行)에 비(比)하여 변화(變化)가 많다. a) 과개교합군(過蓋咬合群)은 H형(型)이 67%이고 나머지는 C형(型). b) 반대교합군(反對咬合群)은 거의 모두가 C형(型). c) 과개교합군(寡蓋咬合群)에서는 반이상(半以上)이 C형(型), 나머지는 H형(型)이나 간혹 V형(型)도 출현(出現)한다. 5) 구치부(臼齒部)에서의 측방반대교합(側方反對咬合)의 경우는 반대교합(反對咬合)이 있는 반대(反對)쪽의 접촉부위(接觸部位)가 넓다. 6) 과개교합군(寡蓋咬合群)에서의 접촉부위(接觸部位)는 정상군(正常群)이나 과개교합군(過蓋咬合群)에서 보다 일반적(一般的)으로 넓게 나타난다.

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Behavior of Concrete-Filled Square Steel Tubular Column-H Beam Connections with Exterior Diaphragm (외부다이아프램으로 보강한 콘크리트충전 각형강관 기둥-H형강보 접합부의 거동)

  • Yoo, Yeong Chan;Lee, Seung Joon;Moon, Tae Sup
    • Journal of Korean Society of Steel Construction
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    • v.9 no.2 s.31
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    • pp.205-220
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    • 1997
  • The objective of this study is to investigate the structural behavior of concrete-filled steel tubular column-H beam connections with exterior stiffeners. As a preliminary test, simple tensile test on the column to H-beam flange connections stiffened were conducted The paramaters of tensile test are the thickness(T=9, 12, 15m) and the width(W=50, 75, 100, 150mm) of exterior stiffeners. The simple tensile test were conducted to 7 kinds of specimens. Estimating the load, displacement, and strain from each kind, results of simple tensile test were compared with results of second test. On the basis of simple tensile test, test on the column to H-km connections stiffened with the sames under monotonic and cyclic load were conducted. Specimens of 5 for the second experiment were made. In analysis, comparing each strengthes and stiffnesses we estimated deformation capacity. Comparing and estimating each yielding strength ratios and maxium-strength ratios on the basis of yield line theory, new strength formula of beam-to-column connections was suggested.

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A Study on Compressive Strength of Built-up H Shaped Columns Fabricated with HSA800 High Performance Steels (건축구조용 고성능강(HSA800) 용접 H형단면 기둥의 압축강도에 관한 연구)

  • Kim, Tae Soo;Lee, Myung Jae;Oh, Young Suk;Lee, Kang Min;Kim, Do Hwan
    • Journal of Korean Society of Steel Construction
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    • v.24 no.6
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    • pp.627-636
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    • 2012
  • Recently, high performance(strength) steels have been utilized to structural materials in buildings and bridges with the demand for high-rise and long-span of main structures. This paper is a series of basic study for the design specification of structural members using high performance steel, material properties of high performance rolled steel building structures; material properties of HSA800 steel was compared with the requirements of Korean Standards(KS) for HSA800. Welded H-shape stub columns with variables of width-to-thickness ratios are planned in order to investigate the local buckling behaviors and check the current design limit of width-to-thickness ratio and uniaxial compressive tests are carried out. In addition, the buckling behaviors of stub columns obtained finite element analysis were compared with those of test results.

A Characteristics of Dual-Band PIFA for Mobile Phones Using H-Types Slits in the Radiators (방사부의 H형 Silt을 이용한 이동통신 단말기용 이중대역 PIFA 안테나 특성)

  • Lee Young-Hun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.16 no.1 s.92
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    • pp.84-91
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    • 2005
  • In this papers, we study the characteristics of dual band PIFA(Planar Inverted F antenna) for handy phones using H-type silt in the antenna radiators. Slit types on the antenna radiator vary resonance mechanism of the antenna and affect reactance component of impedance for the antenna. Therefore the antennas resonate at the dual band(cellular -band, Korea-PCS band), the bandwidth, input impedance and radiation patterns of the proposed antenna is affected by the silt length on the radiators. In order to demonstrate the validity of the proposed theory, it is implementation the antenna of the 4 types. From results for the experiment of the implementation antenna, -5 dB bandwidth of return loss is content with the allocated bandwidth of Cellular and Korea-PCS system the gains of the antenna is about -8$\~$ - 1 dB, the radiation patterns for x-polarized or y-polarized are omnidirectional pattern. From above the results of this papers, it is conclude mobile phones antenna for handy phones using this papers results.