• 천문학회보
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• 제36권1호
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• pp.82.2-82.2
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• 2011

Infra-Red Dark Clouds (IRDCs) seen silhouette against the bright Galactic background in mid-IR are a class of interstellar clouds that are dense and cold with very high column densities. While IRDCs are believed to be the precursors to massive stars and star clusters, individual IRDCs show diverse star forming activities within them. We report a remarkable example of such cloud, the IRDC at ${\Gamma}53.2^{\circ}$, and star formation activity in this cloud. The IRDC was previously identified in part as three separate, arcmin-size clouds in the catalogue of MSX IRDC candidates, but we found that the IRDC is associated with a long, filamentary CO cloud at 2 kpc from the Galactic Ring Survey data of $^{13}CO$ J = 1-0 emission, and that its total extent reaches ~ 30pc. The Spitzer MIPSGAL 24mm data show a number of reddened mid-IR sources distributed along the IRDC which are probably young stellar objects (YSOs), and the UWISH2 $H_2$ data (2.122mm) reveal ubiquitous out flows around them. These observations indicate that the IRDC is a site of active star formation with YSOs in various evolutionary stages. In order to investigate the nature of mid-IR sources, we have performed photometry of MIPSGAL data, and we present a catalogue of YSOs combining other available point source catalogues from optical to IR. We discuss the evolutionary stages and characteristics of YSOs from their IR colors and spectral energy distributions.

• Bulletin of the Korean Chemical Society
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• 제16권9호
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• pp.864-869
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• 1995

Investigation of the structures of the gangliosides has proven to be very important in the understanding of their biological roles such as regulation of differentiation and growth of cells. We used nuclear magnetic resonance spectros-copy in order to investigate the structure of GA1. In order to do this, the assignment of spectra is a prerequisite. Since GA1 does not have polar sialic acid, the spectral overlap is severe. In order to solve this problem, we use 2D NMR spectroscopy and heteronuclear 1H/13C correlated spectroscopy in this study. Here, we report the complete assignment of the proton and the carbon spectra of the GA1 in DMSO-d6-D20 (98:2, v/v). These assignments will be useful for interpreting 1H and 13C NMR data from uncharacterized oligosaccharides and for determining the linkage position, the number of sugar rings, and the sequence of new ganglioside. Amide proton in ring Ⅲ shows many interring nOes and has intramolecular hydrogen bonding. This appears to be an important factor in tertiary folding of GA1. Based on this assignment, determination of three dimensional structure of GA1 will be carried out. Studies on the conformational properties of GA1 may lead to a better understanding of the molecular basis of its functions.

• 방송공학회논문지
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• 제20권5호
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• pp.774-777
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• 2015

본 논문에서는 8K(7680x4320) UHD(Ultra High Definition) TV에서의 화질 향상을 위한 영상신호 처리용 프로그래머블 비디오 프로세싱 플랫폼을 세계 최초로 제안하였다. 8K 영상을 초당 60 프레임으로 처리하기 위해서는 고성능 컴퓨팅 능력과 대용량의 메모리 대역폭이 지원되어야 한다. 제안한 아키텍처에서는 입력 영상의 병렬처리를 위한 멀티 클러스터 구조, 클러스터 간이 데이터 파이프라이닝을 위한 링 데이터 패스 구조 및 필터링 연산을 위한 하드웨어 가속기로 구성되었다. 재구성형 프로세서(Reconfigurable Processor) 기반의 제안된 플랫폼은 다양한 화질향상 알고리즘을 구동할 수 있으며, UHD 방송 표준 및 디스플레이 패널 변동성에 알고리즘의 업데이트만으로 대응이 가능한 큰 장점을 갖고 있다.

• 한국진공학회지
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• 제11권2호
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• pp.113-118
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• 2002

대면적 GaAs 웨이퍼의 플라즈마 식각 공정에서 식각 깊이의 좋은 균일도를 얻기 위해 반응기 내의 가스 흐름을 조절하는 진보된 기술을 실험하였다. 유한차분수치법(Finite Difference Numerical Method)은 GaAs 웨이퍼의 건식 식각을 위한 반응기 안의 가스 흐름의 분포를 시뮬레이션하기에 유용한 방법이다. 이 방법을 이용해 시뮬레이션된 자료와 실제의 것이 상당히 일치한다는 것이 $BCl_3/N_2/SF_6/He$ICP플라즈마의 실험 결과로 확인되었다. 대면적 GaAs 웨이퍼의 플라즈마 식각 공정 중에서 포커스 링(focus ring)의 최적화된 위치가 가스 흐름과 식각 균일성을 동시에 향상시키는 것을 이해했다. 반응기와 전극(electrode)의 크기가 변하지 않는 상황에서 샘플을 고정시키는 클램프 배치의 최적화를 통해 100 mm(4 inch) GaAs 웨이퍼에서 가스 흐름의 균일성을 $\pm$1.5 %, 150 mm(6 inch) 웨이퍼에서는 $\pm$3% 이하로 유지시킬 수 있는 것을 시뮬레이션결과에서 확인할 수 있다. 시뮬레이션된 가스 흐름의 균일도 자료와 실제 식각 깊이 분포실험 데이터의 비교로 대면적 GaAs 웨이퍼에서 건식 식각의 뛰어난 균일성을 얻기 위해서는 반응기 내의 가스흐름분포의 조절이 매우 중요함을 확인하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.675-678
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• 2005

Cement paste is originally the basic material and crucial factor consisting concrete. This study investigates the relationship between flow apparatuses, which are ring flow, flow cone and mini slump, in order to estimate the fluidity of cement paste. For quantitatively evaluating the measured data, this study also analyses the calibration of the rheology consistents of cement paste using viscometer. For this purpose, the present work discusses the influence of the differences of companies and ingredients, affecting the fluidity of cement paste

• 한국수소및신에너지학회논문집
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• 제20권1호
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• pp.64-72
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• 2009

In order to convert efficiently vibration energy of a car tire wheel into electrical power by using piezoelectric materials, the design of the materials must be performed for the dynamic characteristics of the piezoelectric materials to be matched with them of the vibration energy sources well. An accelerometer was installed on the tire wheel with a slip ring to investigate the dynamic mode of the wheel as one of the vibration energy sources. During road test, the measurement on the vibration mode of the tire wheel was performed with variations of car speed and road condition. The experimental data were analyzed details for availability as a micro power source for wireless TPMS(Tire Pressure Monitoring System).

• 토지주택연구
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• 제7권4호
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• pp.323-328
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• 2016

아파트의 슬래브에는 전기등박스 매입을 위한 소형 박스 개구부가 존재한다. 이 박스 개구부 주변에는 건조수축으로 인한 균열을 방지하기 위하여 일부에서는 용접철망이나 플라스틱 링 등으로 보강한 상세를 적용하고 있다. 이러한 보강의 타당성을 검토하고 경제적인 대안을 모색하기 위하여 여러 가지 대안으로 보강을 한 슬래브 전기박스 주변의 건조 수축량을 측정하여 분석하였다. 등박스 주변의 보강방법 대안은 기존에 여러 건설사에서 사용되고 있는 용접철망보강안과 플라스틱링 보강안 및 보강을 하지 않은 무보강안 3가지로 하여 비교 분석하였다. 여기서 대상으로 한 아파트는 전용면적 $59m^2$ 이하의 소형평형을 대상으로 하였고 거실 등의 슬래브 하부에 전등박스 주변에 신축량 측정용 팁을 부착하고 컨텍게이지로 신축량을 측정하여 분석하였다. 측정 결과 3가지 대안들에서 상호간의 유의미한 차이가 나타나지 않았고 전반적인 변형량은 $-264{\mu}{\varepsilon}{\sim}+216{\mu}{\varepsilon}$의 범위에 있는 것으로 나타났다. 측정한 변형량의 추이는 거푸집 탈형일 기준치에서 3~5주까지는 조금씩 증가(+)하다가 그 이후 감소하여 수축(-)하는 경향을 띠고 있으며, 한두번의 측정을 제외하고는 변형률이 $+120{\mu}{\varepsilon}$ 이내의 범위에 있는 것으로 나타내고 있어, 콘크리트의 인장 균열 발생 가능성이 매우 거의 없었다.

• 한국운동역학회지
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• 제14권1호
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• pp.41-50
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• 2004

The objective of the study is to analyze the myoelectrical activity involved in performing the Swallow movement, a D-level technique, in order to use it as the basic research data in helping train gymnasts in how to perform strength-related techniques. To this end, four national representative athletes who participated in the 2002 Busan Asian Games were selected. The results of the comparison analysis of the individual models are summarized as follows. 1) The results of the E.M.G analysis showed that during the Swallow movement, the myoelectrical activity was detected higher in pectorialis major muscle and bicep brachii muscle than in trapezius muscle and deltoid muscle. 2) The results of the E.M.G analysis showed that during the Swallow movement, the myoelectrical activity was measured high in triceps brachii muscle and palmaris longus muscle, while the myoelectrical activity was recorded low in latissimus dorsi muscle and rectus abdominis muscle. 3) In performing the Swallow in the rings, the mean average (%) was found high in the order of erector spinae, pectorialis major muscle, palmaris longus muscle, triceps brachii muscle, deltoid muscle, latissimus dorsi muscle, and trapezius muscle. All taken together, the athletes showed a difference in the distribution of the muscles during the performance of the Swallow. The muscle that showed a constant distribution among the athletes was pectoralis major muscle, which proves that for a stable performance, it is ideal to increase the myoelectrical activity in pectoralis major muscle.

• Journal of Advanced Marine Engineering and Technology
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• 제20권4호
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• pp.50-58
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• 1996

The torsional vibration of the propulsion shafting system equipped with viscous damper is investigated. The equivalent system is modeled by a two mass softening system with Duffing's oscillator and the vibratory motion is described by non-linear differential equations of second order. The damper casing is fixed at the front-end of crankshaft and the damper's inertia ring floats in viscous silicon fluid inside of the camper casing. The excitation frenquency is proportional to the rotational speed of engine. The steady state response of the equivalent system is analyzed by the computer and for this analyzing, the harmonic balance method is adopted as a non-linear vibration analysis technique. Frequency response curves are obtained for 1st order resonance only. Jump phenomena are explained. The discriminant for the solutions of the steady state response is derived. Both theoretical and measured results of the propulsion shafting system are compared with and evaluated. As a result of comparisions with both data, it was confirmed that Duffing's oscillator can be used in the modeling of the propulsion shafting system attached with viscous damper with non-linear stiffness.

• Journal of Advanced Marine Engineering and Technology
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• 제20권4호
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• pp.372-372
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• 1996

The torsional vibration of the propulsion shafting system equipped with viscous damper is investigated. The equivalent system is modeled by a two mass softening system with Duffing's oscillator and the vibratory motion is described by non-linear differential equations of second order. The damper casing is fixed at the front-end of crankshaft and the damper's inertia ring floats in viscous silicon fluid inside of the camper casing. The excitation frenquency is proportional to the rotational speed of engine. The steady state response of the equivalent system is analyzed by the computer and for this analyzing, the harmonic balance method is adopted as a non-linear vibration analysis technique. Frequency response curves are obtained for 1st order resonance only. Jump phenomena are explained. The discriminant for the solutions of the steady state response is derived. Both theoretical and measured results of the propulsion shafting system are compared with and evaluated. As a result of comparisions with both data, it was confirmed that Duffing's oscillator can be used in the modeling of the propulsion shafting system attached with viscous damper with non-linear stiffness.