• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2014년도 제50차 하계학술대회논문집 22권2호
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• pp.1-4
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• 2014

인텔 Many Integrated Core (MIC) 아키텍쳐는 61개의 코어가 하나의 칩에 결합되어 있다. Xeon Phi 로 명명된 인텔 MIC는 인텔 E5 Xeon CPU 보다 2배의 single precision GFLOPs 성능을 제공한다. 인텔 MIC 는 수치연산에 최적화 되어 있는 아키텍쳐이다. 우리는 Xeon Phi 7120P를 가지고 벤치마킹을 하였고 클락스피드 1.238GHz, 61Core 이고 한 개의 코어당 4쓰레드를 사용하며 이론상 최고 성능은 Peak Double Precision(GFLOP)는 약 2-TFlops 이다. 이에 우리는 인텔 X86 아키텍쳐에서 openMP 와 인텔 MKL(Math kernel library) 라이브러리를 이용한 병렬프로그램을 작성하여 쓰레드 수를 증가 시키면서 인텔 Xeon Phi 와 E5 Xeon CPU에서 single precision 성능을 벤치마킹 하여, Xeon Phi 와 Xeon E5 의 이론적인 성능을 비교해 보고자 한다. 또한 openMP와 인텔 MKL라이브러리를 사용한 병렬환경에서 CPU의 성능 지표인 클락스피드와 코어수 외에 Vector unit size 의 크기가 성능에 어떤 영향을 미치는지 살펴보았다.

• 디지털융복합연구
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• 제13권1호
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• pp.305-311
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• 2015

현대에 들어 IT 시장은 대형화와 복합화가 진행되고 경쟁이 더 심화되고 있기 때문에 전통적인 사업관리 방식으로는 관리하기 어려운 정보시스템구축 사업이 많아지면서 이를 효율적으로 관리할 수 있는 제도적 장치와 이를 지원하는 사업관리 프로세스를 도출하기 위하여 실무자(현장PM 및 사업참여자)를 대상으로 설문조사를 실시하였다. 이를 통해 소프트웨어개발 사업관리 요소기술의 중요도와 취약도를 파악하여 개선해야 할 요소기술이 도출되었고, 이를 활용하여 사업관리의 필요성과 총괄사업관리자의 역할과 핵심 사업관리 분야를 결정하는데 논리적 근거를 제시하는 매우 유의미한 결과를 얻었다.

• 전력전자학회논문지
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• 제24권1호
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• pp.9-15
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• 2019

Sensorless electric superchargers have recently been actively developed to provide a large amount of oxygen to engines in order assist the combustion process for miniaturizing the engines and improving fuel efficiency. The model-based sensorless method for surface-mounted permanent magnet synchronous motors has a disadvantage in that the system may become unstable due to parameter variations in low-speed operation and the rapid-acceleration section. An electric supercharger requires fast response to improve the engine response delay, such as the turbocharger turbo-rack. Therefore, the responsiveness must be improved to use the model-based sensorless system. The position compensation algorithm designed in this study is controlled by converting the position error into the beta, which is the angle formed by the d-axis and the stator current during sudden speed change. In this study, we improved the response of the model-based sensorless system through the algorithm and verified the algorithm validity by applying the algorithm to an actual dual-motor supercharger.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.98-99
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• 2021

The number of fires in the Korean distribution warehouse increased by about 350 from 1,070 in 2014 to 1,416 in 2020. In addition, the fire load increases with the scale of the distribution warehouse, and even if the automatic sprinkler operates, there is a limit to the direct intrusion of the water source into the ignition source, and the detector is often installed on a high ceiling. The sensing time is often delayed. In order to improve the fire safety of such distribution warehouses, the US NFPA stipulates in detail the contents related to the facility, such as sprinkler water discharge standards, rack-type warehouse installation height restrictions, and regulations on collection and equipment. However, in Japan, the goods loaded inside the distribution warehouse are not classified in detail, and it is considered that the fire safety for the distribution warehouse is low due to the relaxation regulations of the fire prevention section. Therefore, in this study, common problems are classified into material, spatial, and safety management characteristics through the cases of distribution warehouse fires that occurred in Korea and abroad, and the problems related to distribution warehouses in Korea and abroad are compared and analyzed. And present basic materials for improving the life safety standards of future distribution warehouse facilities.

• 한국농공학회논문집
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• 제65권1호
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• pp.61-72
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• 2023

The increase in the rearing intensity of pigs has caused deterioration in the pig house's internal environment such as temperature, humidity, ammonia gas, and so on. Traditionally, the widely used method to control the internal environment was through the manipulation of the ventilation system. However, the conventional ventilation system had a limitation to control the internal environment, prevent livestock disease, save energy, and reduce odor emission. To overcome this problem, the air-recirculated ventilation system was suggested. This system has a semi-closed loop ventilation type. For designing this system, it was essential to evaluate the ventilation rates considering the pressure loss of ducts. Therefore, in this study, pressure loss calculation and experiment were conducted for the quantitative ventilation design of a semi-closed loop system. The results of the experiment showed that the inlet through which external air flows should always be opened. In addition, it was also found that for the optimum design of the semi-closed loop ventilation system, it was appropriate to install a damper or a backflow prevention device rather than a ventilation fan.

• 로봇학회논문지
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• 제19권1호
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• pp.58-64
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• 2024

The ability of the robot gripper to handle a wide range of objects significantly impacts its operational effectiveness. Among the robot grippers commonly used, the economically feasible choice is the relatively simple structure of a parallel gripper. To perform more densely packed tasks with a parallel gripper, it should be capable of handling small objects. Therefore, this study designs a parallel gripper mechanism equipped with assisting grippers to ensure smooth grasping of small objects. The parallel gripper is designed using a rack and pinion gear system, with two additional grippers on both side, and these assisting grippers are designed to be detachable. The two assisting grippers have different type of tip to grasp thin fabric shapes and thin stick shapes. The gripper prototype is used to verify the grasping capabilities for shapes achievable with a conventional parallel gripper and those intended for grasping with the assisting grippers through grasping experiments. Consequently, by equipping a conventional parallel gripper with assisting grippers as in this study, it becomes capable of handling a broader range of objects, in addition to its existing functionality.

• 한국산학기술학회논문지
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• 제17권9호
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• pp.493-501
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• 2016

본 연구에서는 급곡선과 급구배가 많은 산악 도로 상의 궤도에서 운행할 수 있는 산악트램의 추진시스템 핵심 기술을 개발하였다. 국내 산악 관광지는 겨울철 폭설과 결빙에 의해 교통이 통제되고 있어 지형 조건 뿐만 아니라 기후 조건에도 무관한 산악철도가 필요하다. 먼저, 일반적인 120‰ 구배 등반에 소요되는 견인전동기 출력을 고려하여 추진시스템을 설계하였으며, 추진장치 설치 공간을 고려하여 동력 전달 계통을 설계하고 감속기 및 동력 전달축을 개발하였다. 급구배 상승을 위해 필요한 랙앤피니언 추진장치의 강체 접촉에 의한 진동 소음을 줄이기 위해 탄성 피니언을 개발하여 적용하였으며, 충격 비교 시험을 통해 기존 강체 피니언에 비해 진동이 1/3이하로 감소됨을 확인하였다. 반경 10m의 급곡선을 운행할 수 있도록 개별 회전 차륜 차축을 개발하였다. 또한 급구배 주행중 제동력 향상을 위해 밴드 제동장치를 개발하였으며, 제동력 시험을 통해 요구 제동력을 발휘할 수 있음을 확인하였다. 개발된 주요 부품은 시험을 통해 성능을 검증하였고, 최종적으로 급구배 및 급곡선 운행 대차시스템에 적용된다.

• 대한화학회지
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• 제19권5호
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• pp.317-324
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• 1975

$Na^+,\;Ca^{2+},\;Ni^{2+},\;Al^{3+}$ 이온이 포화된 montmorillonite상에 여러 溫度에서 일어난 $H_2O와\;D_2O$의 氣相吸着에 관하여 연구하였다. 吸着으로 인하여 생긴 OH의 IR 신축진동 band를 computer에 의하지 않고 4개의 Gauss 成分으로 나누었다. 물과 silanol OH기와의 共鳴理論은 $3625cm^{-1}와\;2680cm^{-1}$로 증명되었다. $3400cm^{-1}$와 2475cm 에서의 broad한 吸收는 吸着된 물과 水素結合을 일으키고 있는 silanol OH의 신축진동에 의한 것이었고 $3650cm^{-1}와\;2345cm^{-1}$ band는 吸着된 $H_2O와\;D_2O$에 의한 것이었다. 吸着水와 表面 OH사이의 水素結合은 精電氣的 相互作用에 의한 것임이 밝혀졌다.

• 한국가구학회지
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• 제20권1호
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• pp.42-51
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• 2009

As wine culture becomes popular among the people in modem society, the consumption of wine has increased due to the need to enjoy wine at home. Nonetheless, the development of wine cabinet has not made much progress. In order to compensate such matter, a wine cabinet that satisfies the taste of new generation as well as the need demanded in the modem living space is transcended its simple and solemn image embedded in wooden colored form, which is often found in existing products. First of all, the definition, kind, bottles, and glasses of wine are examined and then a cabinet is developed depending on the design process. The body of the wine cabinet is finished with black lacquer after attaching ash-patterned veneer on MDF and the front plate of the drawer is finished with the colors displayed in Mondrian's painting on MDF. The upper part is designed to store wine glasses and below the wine rack is the space for wine storage considering the overall shape. The storage at the lower part is equipped with drawers of different sizes to emphasize practicability. In conclusion, such a unique design is believed to introduce the importance of design to the domestic furniture market being a foundation for the furniture industry.

• 생약학회지
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• 제31권1호
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• pp.87-94
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• 2000

Mt. Dae-Am is the branch-range of DMZ located on the $38^{\circ}7'$ N KangWon-Do in South Korea. The resources of important Herbal medicine (medicinal plants) were Phacellanthus tubiflorus (fam.: Orobanchaceae), Ostericum maximowiczii, Dendranthemum zawadskii Herbich f. latifolium, D. zawadskii subsp. acutilobum, D. var. campanulatum, Halenia corniculata (fam.: gentianaceae), Prunus mandshurica var. glabra, Acanthopanax divaricatus f. inermis. A. chiisanense, A. sessiliflorum, Eleutherococcus senticosus, Bupleurum longeradiatum, Heracleum moellendorffii sub-spp. subbipinnatum, Sanicula rubriflora, Spuriopimpinella bracycarpa f. latifolia, Angelico gigas, Artemisia montana, A. stelleriana, Paeonia japonica, Phellodendron amurense, Schizandra chinensis, Menyanthes trifoliata, and Gentiana axillariflora var. coreana, etc.