• 산업경영시스템학회지
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• 제29권3호
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• pp.111-118
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• 2006

This paper presents design and development of a simulator evaluates the performance of a hierarchical cellular system. The proposed hierarchical cellular simulator, consisting of macro, micro, and pico cells, applies the wrap-around technique to reduce simulation time. The simulator is implemented as object oriented class models by using the C++ language in a PC environment. The resulting application can evaluate the interference, SIR(Signal to Interference Ratio), and capacity of a hierarchical cellular system in various configurations. Moreover, it can be used in other applications such as power control, call admission control, hand over scheme.

• 한국정밀공학회지
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• 제22권10호
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• pp.107-113
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• 2005

This paper presents a method to reduce errors in registration, which is used in transformation coordinate system of the multiple measuring data. In general, the ICP algorithms and feature-based approaches are used for registration. In order to measure wrap-around object, it is necessary to change the scanning direction or set-up of the object. A fixture is made to reduce registration errors caused by inaccurate center point of tooling balls, providing the more accurate registration method. And, the motorized fixture controls rotation and tilting to get precise the measuring data and registration. The proposed motorized fixture and registration method have advantages in accurate registration and precise measurement, compared with the conventional methods.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 춘계학술대회논문집
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• pp.683-688
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• 2003

Vibration characteristics of a fuel rod to be used in KALIMER(Korean Advanced LIquid MEtal Reactor) have been estimated through 3-dimensional finite element analysis and verified by experiment. The fundamental natural frequencies are found to be 6㎐ in air and 2.5㎐ in water. respectively. It has been found that in-water natural frequencies of the fuel rod are lower than in-air ones due to the added mass effect of the fluid filled inside the outer cylinder and they further decreases as the gap between the fuel rod and the outer cylinder increases, namely the added mass effect increases as the gap increases(maximum 54%). It has been also shown that the mass of the wire wrap axially coiled around the fuel rod do not affect the natural frequencies.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2004년도 춘계학술발표대회 논문집
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• pp.83-86
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• 2004

The aeroelastic stability analysis of composite bearingless rotors is investigated using a large deflection beam theory in hover. The bearingless rotor configuration consists of a single flexbeam with a wrap-around type torque tube and the pitch links located at the leading edge and trailing edge of the torque tube root. For the analysis of composite bearingless rotors, flexbeam is assumed to be a rectangular section made of laminate. Two-dimensional quasi-steady strip theory and Loewy's aerodynamic theory with the lift deficiency function are used for unsteady aerodynamic computation. The finite element equations of motion for beams are obtained using Hamilton's principle. Numerical results of selected bearingless rotor configurations are obtained for the lay-up of laminae in the flexbeam and pitch links location.

• 한국식품영양과학회지
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• 제28권3호
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• pp.566-571
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• 1999

Effects of storage temperature at 18oC and 5oC for 9 days and heating conditions on textural char acteristics in strong wheat flour gels were investigated using a Instron after microwave (2450MHz, 700W). Heating condition did not affect the texture property in the wheat flour gels, but the frozen storage was very effective to prevent the hardening of the samples. Hardness, adhesiveness, and gumminess in the wheat flour gels decreased in increasing moisture content from 45% to 55%, but there was little change in cohesiveness. The storage at room temperature for 2 hours resulted in increased hardness in the heated wheat flour gels. PE wrap package of the wheat flour gels prevented weight loss by 3~6% and hardening effectively. Sugar, or sugar and shotening resulted in increased hardness in loaf bread. The hardness and weight loss in loaf breads were markedly changed by the heating time with microwave. The most critical time point was around 4 minutes following the heating.

• 한국군사과학기술학회지
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• 제18권4호
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• pp.415-422
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• 2015

The flow field structures of dual jet-in-cross-flow were examined experimentally for in-lined perforated damage holes configuration using particle image velocimetry. Ensemble averaged in-plane velocity and vorticity data in the jet were determined to study the mean jet structure. Jets are formed by pressure differences between upper and lower airfoil surface. The flow structure of vicinity of the thru holes consist of a vortical structure that wrap around the jets like a horseshoe and develop further downstream through a pair of stream-wise vortices. The shape, size and location of the horseshoe vortex were found to be dependent on the angle of attack. In spite of the existence of battle damage holes, the effect on the control force was insignificant when the damage size was not large enough.

• 자동차안전학회지
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• 제6권1호
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• pp.16-21
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• 2014

Recently Korea and many countries are legislated for pedestrian protection as following the GTR(Global Technical Regulation). Most NCAP organization have been applying pedestrian protection results in their own rating system in individual or overall rating. Euro NCAP agency has been introduced it first. From the beginning, Euro NCAP had assessed occupant and pedestrian protection. It has become to strengthen a pedestrian protection protocol every time published. Korea NCAP also has been rating pedestrian protection with overall rating system. This paper proposed to study new pedestrian protection protocol especially upper leg in order to find injury response based on physical test. On Euro NCAP, the upper leg injury are assessed two kind of value which are bending moment and force.

• Archives of Reconstructive Microsurgery
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• 제10권2호
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• pp.143-148
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• 2001

전북대학교병원 정형외과에서 우측 제 1-5 수지가 모두 절단된 35세 남자에서, 우 수부 무지는 포장주위 피판(wrap around flap)시 제 1 배부 중수골동맥(the first dorsal metacarpal artery)의 고유 동맥(proper digital artery)을 제 1 배부 중족골 동맥(the first dorsal metatarsal artery)에, 두 정맥 분지(tributary of the cephalic vein)는 대 복재 정맥의 분지 (tributary of the greater saphenous vein)에 각각 문합하였고, 수부의 요골신경의 감각 분지는 거상된 포장 주위 피판의 심부비골 신경(deep peroneal nerve)에 신경 외막 봉합술을 시행하였다. 제 2, 3 수지 재건술에서는, 우 2, 3 족지의 족 배 동맥을 요골 동맥에, 대, 소 복재 동맥의 분지를 두 개의 두 정맥 분지에 각각 단-단 문합하였으며, 우 제 2, 3 족지의 표재 비골 신경을 요골 신경 분지에 신경 외막 봉합하였고, 동시에 우 제 2, 3족지의 지골 신경을 우 2, 3 수지의 지골 신경에 신경 외막 봉합하고 7년 추시하였으며, 우 수부 무지와 제 2, 3수지를 이용한 식사하기, 글씨 쓰기 그리고 양말 신기 등의 동작이 가능하였다.

• 방송공학회논문지
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• 제25권3호
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• pp.313-324
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• 2020

본 논문에서는 360 비디오의 특성을 이용하여 픽쳐 경계에서 코딩 효율을 증가시키는 움직임 벡터 예측 방법을 제안한다. VVC의 화면간 예측에서 움직임 벡터 후보군을 구성할 때 주변 블록의 위치가 픽쳐의 경계 바깥이면 후보군 구성 과정에서 제외되어 픽쳐 경계에서 코딩 효율이 감소하게 된다. 이를 해결하기 위해 360 비디오의 부/복호화를 위한 투영 방법의 특성을 이용하여 이미 복호화된 정보로부터 픽쳐의 경계에서 추가로 후보군을 구성하는 방법을 제안한다. 제안하는 방법의 성능 평가를 위하여 JVET-360 CTC의 임의 접근 환경에서 VTM6.0 및 360Lib9.1와 비교한다. 그 결과로써 제안하는 방법은 추가 계산 복잡도 없이 휘도 성분에서 평균 0.02%, 색차 성분에서 각각 평균 0.05%, 0.06%의 비트율 감소를 보이고, 픽쳐의 경계에서는 비트율이 휘도 성분에서 평균 0.29%, 색차 성분에서 각각 평균 0.45%, 0.43% 감소하였다. 그리고 DSCQS (Double Stimulus Continuous Quality-Scale) 방법을 통해 제안하는 방법의 주관적 화질 평가를 수행하여 MOS (Mean Opinion Score)값을 얻는다. MOS값은 평균 0.03 향상되었고, MOS값과 비트량을 이용하여 BD-MOS를 구한다. 그 결과, 제안하는 방법의 성능이 최대 8.78%, 평균 5.18% 향상하였다.

• Journal of Photoscience
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• 제9권2호
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• pp.284-286
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• 2002

The inverted retina of the Onchidium dorsal eye (DE) is composed only of ciliary-type photoreceptor cells (CC's). The outer segment (OS) of the CC is a concentric lamellar structure consisting of many modified ciliary membranes and stains positively with anti-$\beta$-tubulin antibody. Near the base of the OS there are about 30 basal bodies each connecting individually to a cilium. The cilia are rod-shaped at the base, progressing upwards to a flattened sheet-like shape with increasing surface area. Three-dimensional analysis on serial sections demonstrates the ladle-shape of a modified cilium. Many modified cilia wrap around each other like the leaves of a cabbage. Nine pairs of microtubules (MT's) are located regularly in a ring at the base of the cilium, gradually losing their regular arrangement towards the periphery, where they separate into two subgroups that are contained within two swollen portions of a modified cilium. Within the CC of the Onchidium DE, MT's in the modified cilium exist as two poles extending longitudinally in a thin expanded ciliary membrane. This arrangement may support the photoreceptive OS and serve to maintain its structural integrity.