• 제목/요약/키워드: Dual

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

  • 윤종남
    • 마이크로전자및패키징학회지
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    • 제9권1호
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    • pp.15-20
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    • 2002
  • 본 연구에서는 Dual Band휴대폰 전화기의 핵심부품인 Dual Band PLL Module의 무선회로 설계 기술, 초소형 설계기술, 표면실장기술, 소형화 SMD기술, Test기술 및 설계기반 마련 및 대외 경쟁력 있는 Dual PLL Module의 초소형화 기술을 확보하였다.

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메타물질 전송선로를 이용한 이중대역 평형증폭기 (A Dual-band Balanced Amplifier Using Meta-material Transmission Line)

  • 임종식;이재훈;이준;전역환;정용채;한상민;안달
    • 전기학회논문지
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    • 제60권12호
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    • pp.2305-2310
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    • 2011
  • This paper describes a design of dual band balanced amplifier using a lefted handed meta-material transmission line structure for high frequency application. Meta-material transmission lines have been known to have dual band frequency responses. A dual band branch line hybrid coupler is designed using the meta-material transmission lines, and measured at first. Two identical dual band amplifiers are also designed, built and tested using the same meta-material transmission structure. The proposed dual band balanced amplifier is composed of those dual band branch line hybrid coupler and amplifiers. In order to suggest an design example, a prototype of dual band balanced amplifier is built and measured at the dual frequencies, 1800MHz($f_1$) and 2300MHz($f_2$). The simulation and measurement show that the fabricated balanced amplifier operates well at the desired dual frequencies bands with the gain of 11.12dB and 17.67dB at $f_1$ and $f_2$, respectively, with a good agreement with the simulation results.

유륜절개 이중평면 유방확대술 (Periareolar Dual Plane Augmentation Mammaplasty)

  • 심형보;윤상엽
    • Archives of Plastic Surgery
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    • 제33권2호
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    • pp.155-160
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    • 2006
  • Although several reports have been introduced about dual plane augmentation mammaplasty, the description of periareolar approach dual plane augmentation mammaplasty was few. This article describes specific characteristics, and different classification and techniques for the periareolar dual plane breast augmentation while postoperative scars resulted from inframammary crease approach caused complaints. A total of 124 patients(248 breasts) had periareolar dual plane augmentation surgery from 1998 to 2004. Anatomic implants were used in 43 cases. Most of the patients were satisfied with the outcomes of periareolar dual plane augmentation. Periareolar dual plane augmentation mammaplasty adjusts implant and tissue relationships to ensure adequate soft-tissue coverage while optimizing implant-breast parenchymal dynamics to offer increased benefits and fewer faults compared to a single pocket location in a wide range of breast types with minimal scars. Two types of dual plane classifications are discussed in this study for the periareolar approach exclusively. The boundaries of retroglandular dissection remain constant, as the costal origin of pectoralis major are divided. Type A dual plane implies that the inferior edge of pectoralis muscle lies below the inferior areolar border, and type B dual plane implies that the inferior edge lies above the superior areolar border.

위성의 Dual-Spin Turn 방법 분석 및 자세획득 (Investigation of Dual-Spin Turn and Attitude Acquisition of Satellite)

  • 서현호;이승우
    • 한국항공우주학회지
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    • 제34권2호
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    • pp.36-47
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    • 2006
  • 인공위성에서 자세획득을 위해 기동을 하거나 이상상태 발생으로 위성이 임무를 수행하지 못하여 결국에 위성을 잃어버리게 되는 Flat Spin 상태에서 자세를 복구하는 방안인 Dual Spin Turn의 원리에 대한 연구가 수행되었다. Dual Spin Turn 현상에서 중요한 모멘텀 전달 원리를 물리적으로 명확하게 설명하였다. 그리고 기존의 연구결과에서 많이 알려진 방법을 포함하여 일반적인 위성의 관성모멘트 조건과 모멘텀 휠의 회전 방향 등을 여러 가지로 변화시켜 보면서 타당성을 검증하였다. Dual Spin Turn 과정은 개루프 제어와 에너지 감쇄장치의 도입이라는 2단계 제어방법을 이용하여 여러 경우에 대해 시뮬레이션으로 분석해보았다. 또한 제어의 타당성을 입증하기 위해 2단계 제어 이후의 안정성에 대해 검증하였다. 그리고 Dual Spin Turn을 이용하여 Flat Spin Recovery를 수행하는 시나리오를 예제로 제시하였다.

맞벌이 부부의 가족스트레스, 대처전략 및 직업만족도 - 맞벌이부부 남편과 아내의 비교 - (Family Stress, Coping Strategy, and Job Satisfaction in Dual-earner Couples - Comparison of Husband and Wife in Dual-earner Couples -)

  • 최정혜
    • 대한가정학회지
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    • 제43권10호
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    • pp.55-68
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    • 2005
  • This research focused on the family stress, coping strategy, and job satisfaction in dual-earner couples. The subjects of this study were 150 dual-earner couples,300 people, in the Kyeongnam Area, Korea. The major findings from the study are as follows; 1) The degree of family stress of the husband and wife in dual-earner couples was 2.74 and 2.98, respectively, on a scale of 0-5.0. The most stressful event arose from their role as parents caring for their children. The significant variables were religion and the type of expended family in dual-earner couples' husband, and the age of the first child, job, economic level, conjugal period, and marital satisfaction in dual-earner couples' wife. 2) The coping strategy of family stress of the husband and wife in dual-earner couples was 3.41 and 3.45, respectively, on a scale of 0-5.0. Among the strategies, the 'cognitive restructuring' scored highest. The significant variables were religion, the degree of educational level, job, marital satisfaction, and self-esteem in dual-eamer couples' husband, and economic level, the type of expended family, marital satisfaction, and selfesteem in dual-earner couples' wife. 3) The degree of job satisfaction of the husband and wife in dual-earner couples was 3.72 and 3.89, respectively, on a scale of 0-5.0. The most effective variables of job satisfaction of the husband and wife in dual-earner couples was self-esteem and cognitive restructuring strategy, respectively.

Dual Core 시스템에서 Shared Memory 기능 구현 (Implementation of the Shared Memory in the Dual Core System)

  • 장승주
    • 한국콘텐츠학회논문지
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    • 제8권9호
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    • pp.27-33
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    • 2008
  • Linux에서 사용되는 Shared Memory는 동일한 메모리 영역에 여러 개의 프로세스가 접근할 수 있도록 해 주는 기술이다. 본 논문은 Linux 운영체제에서 지원해 주는 System V의 IPC 중 하나인 Shared Memory를 Dual Core 시스템 상에서 동작하도록 구현한다. 본 논문에서는 커널 단계에서 처리되는 SVR(System V Release) 형식의 Shared Memory를 다룬다. 기존의 공유메모리 방식은 단일 처리기를 이용한 방식이다. 본 논문에서는 dual core를 이용하여 공유메모리 처리를 할 수 있는 시스템을 제안한다. 본 논문에서 제안하는 Dual Core 시스템에서 공유 메모리 기능 구현은 기존의 단일 처리기 시스템에서보다 성능을 향상시킬 수 있도록 한다. 공유 메모리를 이용한 프로세스의 동작이 별개의 CPU에서 동작되도록 함으로써 성능 향상을 꾀한다.

이중 프로젝션 필터를 이용한 흉부 X-선 영상의 복원 (Restoration of Chest X-ray Image Using Dual Projection Filter)

  • 이태수;민병구
    • 대한의용생체공학회:의공학회지
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    • 제13권1호
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    • pp.25-32
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    • 1992
  • A new restoration method of chest X -ray image (dual project filter) was proposed to improve SNR(signal to noise ratio) characteristics. In this method, a priori Information of system and anatomical structure and statistics of projected object are used in the design of filter. Dual projection filter varies its parameters, adapting to the local regions of chest(lung region, mediasternum, subdiaphragm) and the structure of chest (bone, tissue, blood vessel, bronchia). The performance of Dual Projection Filter was 0.1-0.2dB better than Dual Sensor Wiener Filter, which was used for initial estimate of Dual Porjection Filter.

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