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박병석 ( Byungsuk Park ),김우석 ( Wooseok Kim ),황성필 ( Sungpil Hwang ),권오일 ( Oil Kwon ) 대한지질공학회 2020 지질공학 Vol.30 No.4
비탈면의 안정성 측면에서 파괴형태에 따라 예상 파괴면에서의 지반 전단력과 앵커보강에 의한 저항력은 중요한 요소로 작용할 수 있다. 또한, 앵커가 보강된 비탈면에서는 지압판이 설치된 지반의 풍화, 침하 및 불완전하게 방청 처리된 강연선의 부식 등으로 인하여 앵커축력이 변할 수 있다. 그러나 앵커 축력의 변화로 인해 국부적으로 앵커의 저항력을 상실한 경우에는 앵커가 저항력을 발휘하지 못하게 되어 주변 앵커로 외력이 전가되는 경향이 있으며, 이에 따라 주변앵커의 긴장력을 증가시키게 된다. 이로 인해 전체 비탈면의 안정성에 문제가 발생하게 되므로 주의가 요구된다. 따라서 본 연구에서는 비탈면에 설치되어 있는 앵커의 긴장력 변화경향을 모니터링하고 이를 고려한 비탈면 전체의 외적 안정성을 유추하는 방법을 제안하고자 하였다. The ground shear force at the expected failure surface and resistance force due to reinforced anchor can act as important factors according to a failure type from the stability viewpoint at a slope. Furthermore, the anchor’s axial force may vary at an anchor-reinforced slope due to ground weathering, settlement, and corrosion in the incompletely anti-corrosion treated steel wire strand at a ground where the bearing plate is installed. However, in case that the resistance force of the anchor is locally lost due to the variation of the anchor’s axial force, the resistance force may not play the role so that the external force tends to be transferred to the surrounding anchors, causing an increase in the tensile force in the surrounding anchors. Accordingly, a stability problem at the entire slope may occur, which requires much attention. Thus, this study proposed a method to monitor a variation trend of the tensile force of anchors installed at a slope and infer the external stability at the entire slope considering the monitoring result.
박병석(Byungsuk Park),이상진(Sang-Jin Lee),장영조(Young-Jo Jang),캄란 에쉬라기안(Kamran Eshraghian),조경록(Kyoungrok Cho) 대한전자공학회 2014 전자공학회논문지 Vol.51 No.10
곱셈기는 멀티미디어 통신 시스템과 같이 다양한 신호처리 알고리즘을 갖는 복잡한 연산을 수행한다. 곱셈기는 상대적으로 큰 전달 지연시간, 높은 전력 소모, 큰 면적을 갖는다. 이 논문은 멤리스터-CMOS 기반의 재구성 가능한 곱셈기를 제안하여 곱셈기 회로의 면적을 줄이고 다양한 응용프로그램에 최적화 된 비트폭을 제공한다. 멤리스터-CMOS 기반의 재구성 가능한 곱셈기의 성능은 1.8 V 공급전압에서 멤리스터 SPICE 모델과 180 nm CMOS 공정으로 검증했다. 검증 결과 제안한 멤리스터 -CMOS 기반의 재구성 가능한 곱셈기는 종래의 것과 비교시 면적, 지연시간, 전력소모가 각각 61%, 38%, 28% 개선되었고, twin-precision 곱셈기와 면적 비교에서도 22% 개선되었다. Multiplier performs a complex arithmetic operation in various signal processing algorithms such as multimedia and communication system. The multiplier also suffers from its relatively large signal propagation delay, high power dissipation, and large area requirement. This paper presents memristor-CMOS based reconfigurable multiplier reducing area occupation of the multiplier circuitry and increasing compatibility using optimized bit-width for various applications. The performance of the memristor-CMOS based reconfigurable multiplier are estimated with memristor SPICE model and 180 nm CMOS process under 1.8 V supply voltage. The circuit shows performance improvement of 61% for area, 38% for delay and 28% for power consumption respectively compared with the conventional reconfigurable multipliers. It also has an advantage for area reduction of 22% against a twin-precision multiplier.
진재현,박병석,고병승,윤지섭,정기정,Jin Jaehyun,Park Byungsuk,Ko Byungseung,Yoon Jisup,Jung Ki-Jung Korean Radioactive Waste Society 2005 방사성폐기물학회지 Vol.3 No.3
In this paper, a prototype of the Bridge-Transported Servo Manipulator (BTSM) system is introduced, which has been developed to do operation and maintenance jobs remotely in a hot cell. The system consists of a telescopic transporter, a slave arm, a master arm, and a control system. Several tests such as a positional tracking, a weight handling, reliability, and operability have been performed and test results are presented. Based on the test results, an upgraded system which will be used during demonstrations of the advanced spent fuel conditioning process (ACP) has been designed.
[생산기술부문] 자동차용 디스크 브레이크의 열유동 및 열변형 해석
최봉근(Bongkeun Choi),박병석(Byungsuk Park) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
Using CFD airflow and temperature distribution around the ventilated disc brakes were calculated in the case of rapid braking of a car. Exporting grid system and value of temperature of the rotors to the FEM code, thermal deformations of two rotors were also calculated. Since mass flow rate of the air passing through the rotor of inner vent type was greater than the other the cooling performance of the rotor of inner vent type was calculated to be better. Because the time spent in a rapid braking was very short most of the heat generated by the motion was transferred to the rotor. Therefore the values of temperature were almost same for the two rotors. However there was noticeable difference in the thermal deformation between two rotors.
중수형 원자로 급수 배관 검사용 자율 주행형 자벌레 로봇
최창환(Changhwan Choi),박병석(Byungsuk Park),정현규(Hyunkyu Jung),정승호(Seungho Jung) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.2
This paper describes a mobile inspection robot with an automatic pipe tracking system for a feeder pipe inspection in a PHWR. The robot is composed of two inch worm mechanisms. One is for a longitudinal motion along a pipe, and the other is for a rotational motion in a circumferential direction to access all of the outer surfaces of a pipe. The proposed mechanism has a stable gripping capability and is easy to install. An automatic pipe tracking system is proposed based on machine vision techniques to make the mobile robot follow an exact outer circumference of a curved feeder pipe as closely as possible, which is one of the requirements of a thickness measurement system for a feeder pipe. The proposed sensing technique is analyzed to attain its feasibility and to develop a calibration method for an accurate measurement. A mobile robot and control system are developed, and the automatic pipe tracking system is tested in a mockup of a feeder pipe.
진재현(Jaehyun Jin),박병석(Byungsuk Park),안성호(Sungho Ahn),윤지섭(Jisup Yoon),정재후(Jaehoo Jung) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this paper, fault tolerant mechanisms are presented for a servo manipulator system designed to operate<br/> in a hot cell. A hot cell is a sealed and shielded room to handle radioactive materials, and it is dangerous for<br/> people to work in the hot cell. So, remote operations are necessary to handle the radioactive materials in the<br/> hot cell. KAERI has developed a servo manipulator system to perform such remote operations. However,<br/> since electric components such as servo motors are weakened with radiation, fault tolerant mechanisms have<br/> to be considered. For fault tolerance of the servo manipulator system, hardware and software redundancy has<br/> been considered. In the case of hardware, radioactive resistant electric components such as cables and<br/> connectors have been adopted and motors driving a transport have been duplicated. In case of software, a<br/> reconfiguration algorithm accommodating one motor's failure has been developed. The algorithm uses<br/> redundant axes to recover the end effector's motion in spite of one motor's failure.
블록식 보강토 옹벽에서 개별 블록간 거동특성을 고려한 수치해석적 연구
황성필 ( Sungpil Hwang ),박병석 ( Byungsuk Park ),우용훈 ( Yong-hoon Woo ),박상기 ( Sangki Park ),김우석 ( Wooseok Kim ) 대한지질공학회 2021 지질공학 Vol.31 No.4
일반 콘크리트 옹벽에 비해 경관성이 우수한 보강토 옹벽이 최근 많이 사용되고 있다. 다양한 재료와 복잡한 현장여건으로 기존 설계 방식만으로는 안정성 확보가 어려운 경우가 발생되고 있다. 이러한 문제를 해결하기 위해 현장여건에 적합한 안정성 분석 방법에 대한 연구를 진행하였다. 본 연구에서는 기존 수치해석과는 다르게 보강토 블록이 개별거동 가능하도록 적용하였으며, 개별 블록거동에 따른 물성치 및 강도 적용을 위하여 블록간 마찰특성과 블록과 보강재의 연결특성에 관한 실규모 시험을 수행하였다. 수치해석을 통해 현장과 동일한 블록조건의 적용 가능성을 확인하였고, 이를 활용하여 다양한 조합의 블록과 보강재의 안정성 검토 및 설계에 활용 가능 할 것으로 판단된다. 또한 외적안정의 범위를 넓혀 안정성을 더욱 확보할 수 있을 것으로 판단된다. Reinforced earth retaining walls have been widely used in recent years, as they are superior from the landscape perspective than normal concrete retaining walls. However, as reinforced earth retaining walls are made of various materials depending on site, existing design methods cannot secure stability, and a variety of problems have occurred. Studies on the design and stability analysis methods, which are different from existing methods, have been conducted to address these problems. This study conducted a stability investigation using numerical analysis, and blocks of reinforced earth retaining walls were individually applied, which is different from pre-existing numerical analyses. To verify the input values of the numerical analysis when applying individual blocks, real-scale experiments of the friction characteristics between the blocks and the connection properties between the blocks and stiffener were conducted. The applicability of the block conditions, which were the same as those of real sites, was verified through numerical analysis, and will be used for the stability review and design of various combinations of blocks and stiffeners.