• Title/Summary/Keyword: Dual-design

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Mechanical Performance Comparison of Pedicle Screw Based on Design Parameters: Dual Lead and Dual Pitch (척추경 나사못의 디자인이 고정력 및 구동 토크에 미치는 영향 분석: 이중 나사 및 이중 피치 나사)

  • Choi, Sun-Gak;Cha, Eun-Jong;Kim, Kyung-Ah;Ahn, Yoon-Ho
    • Journal of Biomedical Engineering Research
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    • v.39 no.3
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    • pp.134-139
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    • 2018
  • One of the most common problems with pedicle screw system is pullout of the screw. This study was performed to evaluate the pullout strength and driving torque of newly designed pedicle screws. The design of three type screws were standard pedicle screw, which had single lead threaded and single pitched design (Type A), single pitched and dual lead threaded pedicle screw (Type B), dual pitched and dual lead threaded pedicle screw (Type C), respectively. The tests were performed in accordance with the ASTM standards using polyurethane (PU) foam blocks. There was no significant difference in pullout strength among three types of screw. Type B and Type C exhibited higher insertion torque and removal torque than Type A, respectively (p<0.05). Pedicle screws newly developed with dual pitched and dual lead threaded design showed higher driving torque without decrease in pullout strength compared to the standard pedicle screw and could be inserted more rapidly with the same number of revolutions.

Design Method of a Dual Band Balun (듀얼 밴드 발룬 설계)

  • Sung, Jung-Hyun;Song, Young-joo;Jeong, Yong-Woo;park, Hyung-Sik;Ahn, Dal
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2001.11a
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    • pp.165-168
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    • 2001
  • This Paper presents the design method and performance characteristics of a dual band balun. The design method for dual balun is based on the lumped element eqiuvalent circuit of quater-wave transformaer. By employing the proposed configuration and the derived formulas, dual band balun are designed and simulated and manufactured. The proposed design method and equivalent circuit can make it easy to adapt to designing of ceramic multi-layer chip type dual band balun. The dual band will find applications in wireless communication circuits.

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Mixed Dual-rail Data Encoding Method Proposal and Verification for Low Power Asynchronous System Design (저전력 비동기식 시스템 설계를 위한 혼합형 dual-rail data encoding 방식 제안 및 검증)

  • Chi, Huajun;Kim, Sangman;Park, Jusung
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.7
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    • pp.96-102
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    • 2014
  • In this paper, we proposed new dual-rail data encoding that mixed 4-phase handshaking protocol and 2-phase handshaking protocol for asynchronous system design to reduce signal activities and power consumption. The dual-rail data encoding 4-phase handshaking protocol should leat to much signal activities and power consumption by return to space state. Ideally, the dual-rail data encoding 2-phase handshaking protocol should lead to faster circuits and lower power consumption than the dual-rail 4-phase handshaking protocol, but can not designed using standard library. We use a benchmark circuit that contains a multiplier block, an adder block, and latches to evaluate the proposed dual-rail data encoding. The benchmark circuit using the proposed dual-rail data encoding shows an over 35% reduction in power consumption with 4-phase dual-rail data encoding.

A simplified seismic design method for low-rise dual frame-steel plate shear wall structures

  • Bai, Jiulin;Zhang, Jianyuan;Du, Ke;Jin, Shuangshuang
    • Steel and Composite Structures
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    • v.37 no.4
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    • pp.447-462
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    • 2020
  • In this paper, a simplified seismic design method for low-rise dual frame-steel plate shear wall (SPSW) structures is proposed in the framework of performance-based seismic design. The dynamic response of a low-rise structure is mainly dominated by the first-mode and the structural system can be simplified to an equivalent single degree-of-freedom (SDOF) oscillator. The dual frame-SPSW structure was decomposed into a frame system and a SPSW system and they were simplified to an equivalent F-SDOF (SDOF for frame) oscillator and an equivalent S-SDOF (SDOF for SPSW) oscillator, respectively. The analytical models of F-SDOF and S-SDOF oscillators were constructed based on the OpenSees platform. The equivalent SDOF oscillator (D-SDOF, dual SDOF) for the frame-SPSW system was developed by combining the F-SDOF and S-SDOF oscillators in parallel. By employing the lateral force resistance coefficients and seismic demands of D-SDOF oscillator, the design approach of SPSW systems was developed. A 7-story frame-SPSW system was adopted to verify the feasibility and demonstrate the design process of the simplified method. The results also show the seismic demands derived by the equivalent dual SDOF oscillator have a good consistence with that by the frame-SPSW structure.

Development of Dual Band Synthesizer Module(SMD Type) (Dual Band PLL Synthesizer Module(SMD형) 개발에 관한 연구)

  • 윤종남
    • Journal of the Microelectronics and Packaging Society
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    • v.9 no.1
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    • pp.15-20
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    • 2002
  • In this project, we hale developed various techniques for subminiaturization, surface implementation, high frequency design, small-size SMD, performance test and application of the Dual PLL module, which is a core component for the personal communication systems. We also obtained base techniques for the next-generation Dual PLL module design and fabrication techniques for an internationally competitive subminiature Dual PLL module.

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The Design of the Shared Memory in the Dual Core System (Dual Core 시스템에서 Shared Memory 기능 설계)

  • Jang, Seung-Ju;Lee, Gwang-Yong;Kim, Jae-Myeong
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.12 no.8
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    • pp.1448-1455
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    • 2008
  • This paper designs Shared Memory on the Dual Core system so that it operates a general System V IPC on the Linux O.S. Shared Memory is the technique that many processes can access to identical memory area. We treat Shared Memory in this paper among big two branches of Shared Memory which are SVR in a kernel step format. We design a share memory facility of Linux operating system on the Dual Core System. In this paper the suggesting design plan of share memory facility in Dual Core system is enhancing the performance in existing unity processor system as a dual core practical use. We attempt a performance enhance in each CPU for each process which uses a share memory.

A Study on Output and Design of Permanent Magnet Synchronous Motor with Dual-gap (300W급 이중 공극 구조 PMSM 설계 및 출력 특성에 관한 연구)

  • Kim, Seung-Joo;Kim, Youn-Hwan;Choi, Han-Suk;Moon, Jae-Won
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.4
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    • pp.80-87
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    • 2014
  • This paper suggests the dual-gap for generating power and increasing the torque of a direct-drive permanent magnet synchronous motor in a hybrid-cycle. To consider easy coil winding, we applied a structure of dual-gap for the permanent magnet synchronous motor (PMSM). Because the torque of PMSM with the dual-gap is very large, we are designed the appropriate specifications of the PMSM by selected the appropriate dual-gap slot and poles combination. The prototype model is selected by design theory for increasing torque and maximizing output power of PMSM. And the detailed structure design of the model was designed by the loading distribution method. The PMSM models were analyzed by finite element method. Finally, we have suggested appropriate rotor structure has benefit to further increasing torque and prevent decreasing of the output power in PMSM with dual-gap.

A study on an optimal design for a dual-band patch antenna with a shorting pin using the evolution strategy (진화 알고리즘을 이용한 단락핀이 있는 이중대역 패치 안테나 최적 설계 연구)

  • Ko, Jae-Hyeong;Kwon, So-Hyun;Kim, Hyeong-Seok
    • 한국정보통신설비학회:학술대회논문집
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    • 2009.08a
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    • pp.221-224
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    • 2009
  • In this paper, we deal with the development of an optimal design program for a dual-band of 0.92 GHz and 2.45 GHz with shorting pin and slot by using evolution strategy. the optimal shorting pin, coaxial feed and H-shaped patch are determined by using an optimal design program based on the evolution strategy. To achieve this, an interface program between a commercial EM analysis tool and the optimal design program is constructed for implementing the evolution strategy technique that seeks a global optimum of the objective function through the iterative design process consisting of variation and reproduction. The resonance frequencies of the dual-band antenna yielded by the optimal design program are 0.92 GHz and 2.45 GHz that show a good agreement to the design target values.

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Design and evaluation of an innovative LWR fuel combined dual-cooled annular geometry and SiC cladding materials

  • Deng, Yangbin;Liu, Minghao;Qiu, Bowen;Yin, Yuan;Gong, Xing;Huang, Xi;Pang, Bo;Li, Yongchun
    • Nuclear Engineering and Technology
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    • v.53 no.1
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    • pp.178-187
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    • 2021
  • Dual-cooled annular fuel allows a significant increase in power density while maintaining or improving safety margins. However, the dual-cooled design brings much higher Zircaloy charge in reactor core, which could cause a great threaten of hydrogen explosion during severe accidents. Hence, an innovative fuel combined dual-cooled annular geometry and SiC cladding was proposed for the first time in this study. Capabilities of fuel design and behavior simulation were developed for this new fuel by the upgrade of FROBA-ANNULAR code. Considering characteristics of both SiC cladding and dual-cooled annular geometry, the basic fuel design was proposed and preliminary proved to be feasible. After that, a design optimization study was conducted, and the optimal values of as-fabricated plenum pressure and gas gap sizes were obtained. Finally, the performance simulation of the new fuel was carried out with the full consideration of realistic operation conditions. Results indicate that in addition to possessing advantages of both dual-cooled annular fuel and accident tolerant cladding at the same time, this innovative fuel could overcome the brittle failure issue of SiC induced by pellet-cladding interaction.