• Title/Summary/Keyword: lateral drift

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On the Breakdown Voltage and Optimum Drift Region Length of Silicon-On-Insulator PN Diodes (SOI PN 다이오드의 항복전압과 최적 수평길이에 관한 연구)

  • 한승엽;신진철;최연익;정상구
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.31A no.12
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    • pp.100-105
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    • 1994
  • Analytical expressions for the breakdown voltage and the optimum drift region length (L$_{dr}$) of SOI (Silicon-On-Insulator) pn diodes are derived in terms of the doping concentration and the thickness of the n- drift region and the buried oxide thickness. The optimum L$_{dr}$ is obtained from the condition that the breakdown voltage of the vertical electric field of n+n- junction equals to the of the lateral electric field of n+n-p+ junction. Analytical results agree reasonably with the numerical simulations using PISCESII.

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Electrical Characteristics of High-Voltage LDMOSFET Fabricated by CMOS Technology (CMOS 공정으로 구현한 고전압 LDMOSFET의 전기적 특성)

  • Park, Hoon-Soo;Lee, Young-Ki;Kwon, Young-Kyu
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.201-202
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    • 2005
  • The electrical characteristics of high-voltage LDMOSFET (Lateral Double-diffused MOSFET) fabricated by a CMOS technology were investigated depending on the process and design parameters. The off-state breakdown voltages of n-channel LDMOSFETs were linearly increased with increasing to the drift region length. For the case of decreasing n-well ion implant doses from $1.0\times10^{13}/cm^2$ to $1.0\times10^{12}/cm^2$, the off-state breakdown voltage was increased approximately two times, however, the on-resistance was also increased about 76%. Moreover, the on- and off-state breakdown voltages were also linearly increased with increasing the channel to n-tub spacing due to the reduction of impact ionization at the drift region.

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Seismic upgrading of structures with different retrofitting methods

  • Guneyisi, Esra Mete;Azez, Ibrahim
    • Earthquakes and Structures
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    • v.10 no.3
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    • pp.589-611
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    • 2016
  • This paper presents an analytical study aimed at evaluating the seismic performance of steel moment resisting frames (MRFs) retrofitted with different approaches. For this, 3, 6 and 12 storey MRFs having four equal bays of 5 m were selected as the case study models. The models were designed with lateral stiffness insufficient to satisfy code drift and hinge limitations in zones with high seismic hazard. Three different retrofit strategies including traditional diagonal bracing system and energy dissipation devices such as buckling restrained braces and viscoelastic dampers were used for seismic upgrading of the existing structures. In the nonlinear time history analysis, a set of ground motions representative of the design earthquake with 10% exceedance probability in fifty years was taken into consideration. Considering the local and global deformations, the results in terms of inter-storey drift index, global damage index, plastic hinge formations, base shear demand and roof drift time history were compared. It was observed that both buckling-restrained braces and viscoelastic dampers allowed for an efficient reduction in the demands of the upgraded frames as compared to traditional braces.

Evaluation of Lateral Performance in RC Flat Plate System (철근콘크리트 무량판 구조시스템의 횡저항 성능 평가)

  • Song, Ho-Bum;Song, Jin-Gyu
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2006.03a
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    • pp.151-158
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    • 2006
  • Recently, as RC flat plate system is applied on high-rising building largely, necessity of all over research about lateral performance becomes a prominent. In this paper, It is estimated that performance of slab-column connection in flat plate system is inter-story drift index 3.6%. In addition, when R-factor is fixed in seismic design, it must be considered all system. Also Considering that plastic hinge propagation is not adjustable, R-factor should be applied bellow '5.5'.

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A New SOI LDMOSFET Structure with a Trench in the Drift Region for a PDP Scan Driver IC

  • Son, Won-So;Kim, Sang-Gi;Sohn, Young-Ho;Choi, Sie-Young
    • ETRI Journal
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    • v.26 no.1
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    • pp.7-13
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    • 2004
  • To improve the characteristics of breakdown voltage and specific on-resistance, we propose a new structure for a LDMOSFET for a PDP scan driver IC based on silicon-on-insulator with a trench under the gate in the drift region. The trench reduces the electric field at the silicon surface under the gate edge in the drift region when the concentration of the drift region is high, and thereby increases the breakdown voltage and reduces the specific on-resistance. The breakdown voltage and the specific on-resistance of the fabricated device is 352 V and $18.8 m{\Omega}{\cdot}cm^2$ with a threshold voltage of 1.0 V. The breakdown voltage of the device in the on-state is over 200 V and the saturation current at $V_{gs}=5V$ and $V_{ds}$=20V is 16 mA with a gate width of $150{\mu}m$.

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Application of self-centering wall panel with replaceable energy dissipation devices in steel frames

  • Chao, Sisi;Wu, Hanheng;Zhou, Tianhua;Guo, Tao;Wang, Chenglong
    • Steel and Composite Structures
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    • v.32 no.2
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    • pp.265-279
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    • 2019
  • The self-centering capacity and energy dissipation performance have been recognized critically for increasing the seismic performance of structures. This paper presents an innovative steel moment frame with self-centering steel reinforced concrete (SRC) wall panel incorporating replaceable energy dissipation devices (SF-SCWD). The self-centering mechanism and energy dissipation mechanism of the structure were validated by cyclic tests. The earthquake resilience of wall panel has the ability to limit structural damage and residual drift, while the energy dissipation devices located at wall toes are used to dissipate energy and reduce the seismic response. The oriented post-tensioned strands provide additional overturning force resistance and help to reduce residual drift. The main parameters were studied by numerical analysis to understand the complex structural behavior of this new system, such as initial stress of post-tensioning strands, yield strength of damper plates and height-width ratio of the wall panel. The static push-over analysis was conducted to investigate the failure process of the SF-SCWD. Moreover, nonlinear time history analysis of the 6-story frame was carried out, which confirmed the availability of the proposed structures in permanent drift mitigation.

Lateral Load Tests of A 10-Story Reinforced Concrete Frame with Nonseismic Details (비내진 상세를 가진 10층 철근 콘크리트 골조의 횡방향 가력 실험)

  • 이한선;강귀용;김정우
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.04b
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    • pp.525-530
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    • 1998
  • The objective of this experiment is to observe the elastic and inelastic behaviors of high-rise reinforced concrete frames with nonseimic details. To do this, a building frame designed according to Korean seismic code and detailed in the Korean conventional manner was selected. An 1:12 scale plane frame model was manufactured according law. Reversed lateral load tests and monotonic push-over test were performed under the displacement control. To simulate the earthquake effect, the lateral force distribution was maintained to be an inversed triangular by using whiffle tree. From the tests, story displacements, lateral story forces, local plastic rotations and the relations between inter-story drift versus story shear are obtained. Based on the test results, conclusions on the characteristics of the elastic and behaviors of a high-rise reinforced concrete frame with nonseismic details are drawn.

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Effective Beam Width Coefficients for Lateral Stiffness in Flat-Plate Structures

  • Park, Jung-Wook;Kim, Chul-Soo;Song, Jin-Gyu;Lee, Soo-Gon
    • KCI Concrete Journal
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    • v.13 no.2
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    • pp.49-57
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    • 2001
  • Flat-plate buildings are commonly modeled as two-dimensional frames to calculate unbalanced moments, lateral drift and shear at slab-column connections. The slab-column frames under lateral loads are analyzed using effective beam width models, which is convenient for computer analysis. In this case, the accuracy of this approach depends on the exact values of effective beam width to account for the actual behavior of slab-column connections. In this parametric study, effective beam width coefficients for wide range of the variations are calculated on the several types of slab-column connections, and the results are compared with those of other researches. Also the formulas for effective beam width coefficients are proposed and verified by finite element analysis. The proposed formulas are founded to be more suitable than others for analyzing flat-plate buildings subjected to lateral loading.

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An Overview on Performamce Control and Efficient Design of Lateral Resisting Moment Frames

  • Grigorian, Mark;Grigorian, Carl E.
    • International Journal of High-Rise Buildings
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    • v.2 no.2
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    • pp.141-152
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    • 2013
  • This paper presents a brief overview of the recently developed performance-control method of moment frame design subjected to monotonously increasing lateral loading. The final product of any elastic-plastic analysis is a nonlinear loaddisplacement diagram associated with a progressive failure mechanism, which may or may not be as desirable as expected. Analytically derived failure mechanisms may include such undesirable features as soft story failure, partial failure modes, overcollapse, etc. The problem is compounded if any kind of performance control, e.g., drift optimization, material savings or integrity assessment is also involved. However, there is no reason why the process can not be reversed by first selecting a desirable collapse mechanism, then working backwards to select members that would lead to the desired outcome. This article provides an overview of the newly developed Performance control methodology of design for lateral resisting frameworks with a view towards integrity control and prevention of premature failure due to propagation of plasticity and progressive P-delta effects.

A Modified Equivalent Frame Model for Flat Plate Slabs Under Combined Lateral and Gravity Loads (조합하중시의 플랫 플레이트 슬래브 시스템에 대한 수정된 등가골조 모델)

  • Oh, Seung-Yong;Park, Young-Mi;Han, Sang-Whan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.369-372
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    • 2006
  • Flat plate slab systems have been commonly used as a gravity force resisting systems, which should be constructed with lateral force resisting systems such as shear walls and moment resisting frame. ACI 318(2005) allows the Direct design method, the equivalent frame method (ACI-EFM) under gravity loads and the finite-element models, effective beam width models and equivalent frame models under lateral loads. ACI-EFM can be used for gravity loads as well as lateral loads analysis. But the method may not predict the behavior of flat plate slabs under lateral loads. Thus Previous study developed a Modified equivalent frame method(Modified-EFM) which could give more precise answer for flat plate slab under lateral loads. This study is to verified the accuracy of a Modified-EFM under combined lateral and gravity loads. The accuracy of this model is verified by comparing the results using the Modified-EFM with the results of finite element analysis. For this purpose, 7 story building is considered. The analysis results of other existing models are included. The analysis results show that Modified-EFM produces comparable drift and slab internal moments with those obtained from finite element analysis.

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