• 한국전자통신학회논문지
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• 제5권5호
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• pp.444-448
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• 2010

RCR 네트워크 토폴로지[1]는 짧은 지름, 대칭성 등의 특징을 가지고 있어 병렬컴퓨팅 환경을 구성하기에 적합한 상호접속네트워크의 일종이다. Hu and Cao[2]에 의하여 이 토폴로지 분석에 대한 재검토가 이루어졌으며, 그래프 비연결성, 직경, bisection width 등에 대한 오류가 있음을 지적하였다. 이 논문에서는 RCR 네트워크 토폴로지 특성을 분석하고, [2]의 결과에도 여전히 남아있는 '연결그래프가 되기 위한 조건' 및 직경에 대한 오류를 정정한다. 그리고 RCR 네트워크에서 최단경로를 구하기 위한 알고리즘을 제안한다.

• Journal of Advanced Marine Engineering and Technology
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• 제37권1호
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• pp.105-113
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• 2013

본 논문에서는 ${\pi}$형 다중결합선로와 RCR 삽입구조를 이용하여 양호한 절연특성을 가짐과 동시에, 종래에 비해 상당히 축소된 형태의 초소형 윌킨슨 전력분배기를 GaAs MMIC상에 구현하였다. 본 논문에서 제안한 RCR 삽입설계법에 의해 윌킨슨 전력분배기의 선로길이가 ${\lambda}$/46까지 축소되어도 중심주파수에서 -23 [dB]의 절연특성이 유지되었으며, -8 [dB]의 절연특성을 가지는 종래의 ${\pi}$형 다중결합선로 윌킨슨 전력분배기에 비해 절연특성이 개선되었다. 본 논문에서 제안한 윌킨슨 전력분배기의 면적은 0.304 [$mm^2$]로서 GaAs상에 동일한 조건으로 제작된 종래의 윌킨슨 전력분배기 면적의 12.1%밖에 되지 않는다. 상기 윌킨슨 전력분배기는 C/X 밴드에서 양호한 RF 특성을 나타내었다.

• Clinics in Shoulder and Elbow
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• 제26권1호
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• pp.20-24
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• 2023

Background: The Friends and Family Test (FFT) developed by the UK National Health Service evaluates whether patients are satisfied with a service provided, where improvements are needed, and how likely patients are to recommend the intervention. Calculated from the FFT, the Net Promoter Score (NPS) creates a recommendation metric for treatment. The primary aim of this prospective study is to evaluate NPS for arthroscopic subacromial decompression (ASD) and rotator cuff repair (RCR). Secondary aims are to postoperatively evaluate 1-year changes in patients' Oxford Shoulder Scores (OSSs) in terms of the proportion of patients satisfied with their surgery and correlation with FFT. Methods: During a 2-year period, all patients undergoing ASD or RCR completed questionnaires prospectively. Collected preoperatively and postoperatively at 1 year. Results: NPSs were 31 for ASD (n=32) and 52 for RCR (n=39). OSSs increased by 4.3 and 6.9 for ASD and RCR, respectively (P<0.001). Overall, 75% of ASD and 77% of RCR patients were either "satisfied" or "very satisfied," respectively, with procedure outcomes. Scores from FFT had a positive correlation with improvement in OSS and satisfaction scores among patients undergoing arthroscopic shoulder surgeries (P<0.001). Conclusions: The current study shows positive NPS outcomes in patients with ASD and RCR. Scores from FFT correlate well with both satisfaction and OSS among patients. NPS can be an adjunct to traditional patient-reported outcome measures to provide global evaluation of patient experiences to aid in determining the clinical value of common procedures in shoulder orthopaedics. Level of evidence: III.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 1997년도 특별강연 및 춘계학술발표 개요집
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• pp.57-59
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• 1997

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2009년도 학술발표회 초록집
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• pp.524-528
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• 2009

The objectives of this study were to install RCR systems at a typical single family house and a school in Alabama, and evaluate the feasibility and efficiency of using the RCR systems for water harvesting in Alabama. The RCR systemswere equipped with a control system and a CR10X data logger to monitor the system operation and to collect data on precipitation, temperature, overflow, water depth in the storage tank and daily uses of toilet flushing. Daily average water use of the home for toilet flushing was 95 liter and 2100 liter was used at the school during the school days. Rainwater harvesting efficiency was 83.3 and 89 percent and RCR use efficiency was 18 and 98 percent from the home and the school, respectively. A computer program was developed to estimate potential effectiveness of RCR systems. From the analysis result with 10 years rainfall data, a total of 67,000 liters of rainwater could be harvested for domestic uses from a typical single family house which supplies 190 liters per day.

• Steel and Composite Structures
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• 제28권2호
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• pp.195-207
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• 2018

First-order reliability method (FORM) is enhanced based on the search direction using relaxed conjugate reliability (RCR) approach for the embedded nanocomposite beam under buckling failure mode. The RCR method is formulated using discrete conjugate map with a limited scalar factor. A dynamical relaxed factor is proposed to control instability of proposed RCR, which is adjusted using sufficient descent condition. The characteristic of equivalent materials for nanocomposite beam are obtained by micro-electro-mechanical model. The probabilistic model of nanocomposite beam is simulated using the sinusoidal shear deformation theory (SSDT). The beam is subjected to external applied voltage in thickness direction and the surrounding elastic medium is modeled by Pasternak foundation. The governing equations are derived in terms of energy method and Hamilton's principal. Using exact solution, the implicit buckling limit state function of nanocomposite beam is proposed, which is involved various random variables including thickness of beam, length of beam, spring constant of foundation, shear constant of foundation, applied voltage, and volume fraction of ZnO nanoparticles in polymer. The robustness, accuracy and efficiency of proposed RCR method are evaluated for this engineering structural reliability problem. The results demonstrate that proposed RCR method is more accurate and robust than the excising reliability methods-based FORM. The volume fraction of ZnO nanoparticles and the applied voltage are the sensitive variables on the reliable levels of the nanocomposite beams.

• 한국조경학회지
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• 제36권2호
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• pp.99-112
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• 2008

본 연구의 목적은 조경건설업의 중요한 생산지표인 기성실적을 조사분석하여 조경건설업의 매출액 특성을 규명하는 것이다. 연구를 위해 조경건설업을 일반건설업인 조경공사업, 전문건설업인 조경식재공사업과 조경시설물설치공사업으로 구분하고, 타 건설업과 조경건설업의 기성실적 비교분석, 조경건설업의 지역별 연도별 기성실적, 공사1건당 평균기성금액, 업체당 연평균 기성실적을 분석하였다. 이러한 결과를 토대로 하여 조경건설업의 기성실적의 변동 특성에 대한 고찰을 하였으며, 연구의 주요결과는 다음과 같다. 1. 조경건설업은 1997년부터 2006년까지 10년간 타 건설 분야에 비해 기성실적이 상대적으로 크게 증가하여 왔는데, 일반건설업에서 조경공사업의 기성실적이 차지하는 비중은 0.9%에서 1.9%으로 증가하고, 전문공사업에서 조경식재공사업의 기성실적이 차지하는 비중은 1.3%에서 2.5%, 조경시설물설치공사업의 기성실적은 0.5%에서 1.5%로 증가하였다. 또한 조경공사업의 기성실적 증가율은 367%, 조경식재공사업은 328%, 조경 시설물설치공사업은 515% 급증한 것으로 나타났으며, 선행지표인 2006년 계약실적 이 크게 증가한 것으로 보아 향후 이러한 증가 추세가 지속될 것으로 전망되고 있다. 2. 지역별 기성실적에서 서울, 경기의 기성실적이 상대적으로 높아 조경공사업은 전체의 53.5%, 조경식재공사업은 전체의 55.1%, 조경시설물설치공사업은 전체의 71.2%를 차지하고 있어, 조경건설시장의 수도권 집중화 현상이 심각한 것으로 나타났다. 3. 조경건설업의 단위공사당 평균기성금액은 조경공사 5억 4,000만원, 조경식재공사 7,320만원, 조경시설물공사는 7,740만원으로 조경 공사의 1건당 평균계약금액이 상대적으로 높은 것으로 분석 되었다. 조경공사와 조경식재공사는 연도별로 뚜렷한 증가세를 보여주고 있지 못하고 있으나, 조경시설물설치공사는 지속적으로 공사규모가 커지고 있어 2002년부터 조경식재공사보다 1건당 평균기성금액이 높아지고 있다. 4. 조경건설업 업체당 연평균 기성실적은 조경공사업 19억 7,000만원, 조경식재공사업 7억 9,080만원, 조경시설물설치공사업 4억 6,890만원으로 조경공사업의 업체당 연평균 기성실적이 높은 것으로 나타났다. 그러나 조경공사업 및 조경식재공사업은 전체 기성실적이 지속적으로 증가해 왔음에도 불구하고 연평균 기성실적이 증가하지 못하였다. 연구결과를 종합해 보면, 조경건설업의 기성실적은 타 건설업역보다 높은 성장을 해왔고, 이러한 성장추세가 향후에도 계속될 것으로 예측되고 있다. 그러나 조경건설업의 지속적인 성장에도 불구하고 조경공사의 규모가 상대적으로 작다는 점과 조경건설업체수의 급증에 따라 조경건설업체의 기성실적이 영세하다는 문제는 해결되고 있지 않는 것으로 밝혀졌다. 아울러 서울, 경기, 인천 등 수도권 지역에서 차지하는 기성실적이 상대적으로 높게 나타나고 있어 조경건설시장의 수도권 집중화 현상이 심각한 것으로 밝혀졌다.

• 대한건축학회논문집:계획계
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• 제35권7호
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• pp.15-24
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• 2019

The purpose of this study is to analyze the regionality of RCR Arquitectes's architectural characteristics and to figure out how these characteristics were applied to each project. The reason why they become world-class architects, who recently awarded Pritzker Architecture Prize, is because they deal with universality as their most previous inspiration which is harmonized with their own experience of hometown, Olot. They pursue "Equilibrium" is their fundamental aspect which is inspired by their experiences in Olot. The concept "Equilibrium" is classified into three main points. First, the close relationship between the landscape and architecture is priority in this concept, which is the potential of the place through architecture to form a new landscape and to pursue a balance with nature. In order to keep the relationship closer, they captured the intuitive idea through the watercolor sketch in the beginning of the project. And they also promoted the involvement of surrounding nature through horizontality, frame and void, etc. Secondly, they used cor-ten steel as the main material for most projects, and the symbiotic relationship with nature that allow people to have a different sensory experience. And the last feature is that their buildings are easily applied to different usage through users intend and behave so their buildings have transformed with various values. It is because they design buildings with strategy to harmonize between landscape and environment so they have various expansion as buildings or objects. The present era of globalization, architecture with regional identity plays an important role in conveying the values of each region. The purpose of this study is to investigate about RCR Arquitectes, who informed about the Olot and Spain's regionality, and to consider the development of architecture that implies our country's identity.

• Geomechanics and Engineering
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• 제15권4호
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• pp.1017-1027
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• 2018

To explore the influence of coal thickness on the mechanical behavior and the failure characteristics of rock-coal-rock (RCR) mass, the experimental investigation of uniaxial compressive tests was conducted first and then a systematic numerical simulation by particle flow code (PFC2D) was performed to deeply analyze the failure mechanical behavior of RCR specimens with different coal thicknesses in conventional compression tests. The overall elastic modulus and peak stress of RCR specimens lie between the rock and the coal. Inter-particle properties were calibrated to match the physical sample strength and the stiffness response. Numerical simulation results show that the deformation and strength behaviors of RCR specimens depend not only on the coal thickness, but also on the confining pressure. Under low confining pressures, the overall failure mechanism of RCR specimen is the serious damage of coal section when the coal thickness is smaller than 30 mm, but it is shear failure of coal section when the coal thickness is larger than 30 mm. Whereas under high confining pressures, obvious shear bands exist in both the coal section and the rock section when the coal thickness is larger than 30 mm, but when the coal thickness is smaller than 30mm, the failure mechanism is serious damage of coal section and shear failure of rock section.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 봄 학술발표회 논문집
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• pp.79-86
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• 2002

Rock mass classifications form the back bone of the empirical design approach and are widely employed in rock engineering. In this paper the inter-relations were discussed among RMR, Q-system, RCR, N, M-RMR, RMi, and L-RMR. Several relationships for the assessment of the modulus of deformation of rock mass, Poisson's ratio, uniaxial compressive strength, tensile strength, cohesion and internal friction angle were also analysed and suggested.