• 한국정밀공학회지
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• 제14권7호
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• pp.137-143
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• 1997

In this study, handling simulation of a passenger car is carried out to see the effects of suspension compliance, roll stabilizef bar and chassis flexibility. The front suspension of the car is a MacPherson strut type and the rear suspension is a multi-link type. The following five DADS models are constructed and compared to verify the effects of suspension compliance and chassis flexibility during lane change. (1) Vdhicle model without hard point compliance and stabilizer, (2) Vehicle model with hard point compoiance, (3) Vehicle model with hard point compliance and stabilizer, (4) Vehicle model with hard point compoiance, stabilizer, and one vibration mode of the chaxxis. (5) Vehicle model with hard point compliance, stabilizer, and three vibration modes of the chassis. The result shows that hard point compliance and stabilizer are significant in roll angle, and the flexibility of the chassis affects the yaw angle and yaw rate.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 신호처리소사이어티 추계학술대회 논문집
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• pp.183-186
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• 2003

A vision sensor should be calibrated prior to infer a Euclidian shape reconstruction. A point to point calibration. also referred to as a hard calibration, estimates calibration parameters by means of a set of 3D to 2D point pairs. We proposed a new method for determining a set of 3D to 2D pairs for the structured light hard calibration. It is simply determined based on epipolar geometry between camera image plane and projector plane, and a projector calibrating grid pattern. The projector calibration is divided two stages; world 3D data acquisition Stage and corresponding 2D data acquisition stage. After 3D data points are derived using cross ratio, corresponding 2D point in the projector plane can be determined by the fundamental matrix and horizontal grid ID of a projector calibrating pattern. Euclidian reconstruction can be achieved by linear triangulation. and experimental results from simulation are presented.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제22권1호
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• pp.63-69
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• 2000

Le fort II osteotomy is much useful technique to correct the midfacial hypoplasia including nasomaxillary complex especilly in patient with dish face appearance. Not in simple orthognathic surgery but in Le Fort II osteotomy, the standardization of prognostic value is essential in treatment planning to achieve satisfactory postoperative results. According to pervious reports, the ratio of soft tissue change to hard tissue movements varies as to different surgical methods and different facial regions. But there are few report about the ratio of soft tissue change to hard tissue movement following Le Fort II osteotomy. So we tried to develop standarized soft tissue surgical treatment objective. We have followed up 16 patients, who had received Le Fort II osteotomy by one operator from 1990 to 1996, one year postoperatively. In cephalometrics, we used Frankfort line as horizontal reference line, and vertical reference line as one drawn from Sella to horizontal line perpendicularly. The landmarks are G to soft tissue G, N on reference line to soft tissue N, ANS to Pn and A to Sn. The results are as follows. 1. The value of soft tissue change to hard tissue movement showed positive correlation, having statistical significancy at G, N2, N3 point. 2. At G, N2, N3 point, the ratio of soft tissue change to hard tissue movement was 0.51, 0.98 and 0.80 respectively and showed statistical significancy, while at N1, ANS, A point, that was 0.72, 0.49 and 0.26 but didn't showed statistical significance. 3. This result shows much the same change of the soft tissue change to hard tissue movement on the upper nasomaxilla, and less the same change on the lower maxilla and so the Le Fort II osteotomy can be recommended as a reliable effective operation method for correction of nasomaxillary retrusion.

• 한국정보통신학회논문지
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• 제8권5호
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• pp.1089-1095
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• 2004

주어진 네트워크에서 최적의 스타이너 트리를 구하는 문제는 NP-hard이며, 최적에 가까운 스타이너 트리를 구하기 위하여 유전자 알고리즘을 이용한다. 본 논문에서는 이 문제를 해결하기 위하여 유전자 알고리즘에서 염색체를 기존의 이진스트링 대신 부동소수점으로 표현하였다. 먼저 주어진 네트워크에 Prim의 알고리즘을 적용하여 스패닝 트리를 구하고, 부동소수점 표현을 갖는 유전자 알고리즘을 사용하여 새로운 스타이너 점을 트리에 추가하는 과정을 반복함으로써 최적에 가까운 스타이너 트리를 구했다 이 방법을 사용하면 이진스트링을 사용하는 기존의 방법에 비해서 트리가 보다 빠르고 정확하게 최적에 가까운 스타이너 트리에 접근했다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.286-289
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• 1996

Two servo control algorithms are suggested to reduce the tracking error of a computer hard disk drive. One is the repetitive control to reduce the repeatable tracking error which is not explicitly taken into account in the design of a conventional controller. This algorithm was successfully applied to a commercial disk using a fixed point DSP. The other is the multi-rate sampling control which generates the control output between each sampling times since the sampling time of hard disk drives is limited. These algorithms were shown effectively to reduce tracking errors.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.609-612
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• 2007

The HDD (hard disk drive) using Load/Unload (L/UL) technology includes the benefits which are increased areal density, reduced power consumption and improved shock resistance than those of contact-start-stop (CSS). Dynamic L/UL has been widely used in portable hard disk drive and will become the key technology for developing the small form factor hard disk drive. The main design objectives of the L/UL mechanisms are no slider-disk contact or no media damage even with contact during L/UL, and a smooth and short unloading process. In this paper, we focus on lift-off force, pitch static attitude (PSA), roll static attitude (RSA) and dimple point. The "lift-off" force, defined as the minimum air bearing force, is another very important indicator of unloading performance. A large amplitude of lift-off force increases the ramp force, the unloading time, the slider oscillation and contact-possibility. PSA and RSA are also very important parameters in L/UL system and stability of slider is mainly determined by PSA and RSA. Dimple point by PSA and RSA is also important indicator. Therefore we find the optimal dimple point of SFF HDD suspension for improving the unloading performance.

• 한국식품영양과학회지
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• 제21권4호
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• pp.348-352
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• 1992

오리를 고온침탕법과 중온침탕법에 의해 털을 제거하고 다리 및 가슴부위의 골격근에서 actomyosin을 추출하여 몇가지 특성을 비교하엿다. 고온침탕 처리한 근육으로부터 추출된 actomyosin의 추출성은 다리와 가슴근육이 각각 7.84, 39.48mg/g, 중온침탕한 것은 각각 4.79, 28.04mg/g고온침탕법의 추출성이 더 높았다. Actomyosin의 $Ca^{2+}-ATPase$ 활성은 고온침탕법이 다리근육의 경우에서는 중온침탕법보다 낮았으나 가슴근육은 이온강도 0.08 이하에서 중온침탕법이 높았고 그 이상에서는 고온침탕법이 높았다. Actomyosin의 $Mg^{2+}-ATPase$ 활성은 저이온강도에서 활성이 컸으며 가슴근육이 다리근육의 경우보다 침탕법에 의한 활성의 차이가 크게 나타났다. 용해도는 침탕방법과 부위에 관계없이 용해시점과 완료시점이 비슷하였다. 그리고 고온침탕 처리한 근육과 다리보다 가슴근육이 thin filament에 있는 단백질이 많이 추출되어 나오는 현상을 보였다.

• 한국정보통신학회논문지
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• 제13권10호
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• pp.2205-2210
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• 2009

본 논문에서 제안하는 잡음제거 방법은 hard 임계치 방법의 문제점을 개선한 제로점의 탄젠트 곡선 보간에 의한 잡음제거 기술이다. 자연계에서 관측되는 대기 전기변동량과 같은 신호의 시간적 변동량이나 가상현실을 이용하여 추출한사람의 빠른 움직임의 동작 곡선 등은 실제로 복잡하다. 따라서 이러한 신호의 관측파형에 대하여 변곡점에 대한 특징을 정확히 결정하는 것이 매우 중요하다. 특히 자연계의 측정 신호는 잡음이 포함되어 있어서 잡음을 제거하고 특징을 추출하는 것이 필요하다. 본 논문에서 제안한 새로운 방식에 의하여 잡음을 제거하고 변곡점을 추출하며 종래의 방식인 hard 임계치에 비하여 잡음지수가 5인 경우의 noise II 변곡점 신호에 대하여 SNR이 3.4dB 개선된 결과를 얻을 수 있음을 보였다.

• 한국정밀공학회지
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• 제13권5호
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• pp.131-138
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• 1996

This paper suggests a servo control algorithm to reduce the repeatable tracking error which is not explicitly taken into account in the design of a conventional PID controller of a computer hard disk drive. The robust stability of the repetitive control system with multiplicative modelling error is analyzed, and the controller was implemented using a fixed point DSP(Digital Signal Processor). Experimental results show that the repetitive errors are suppressed effectively by the proposed controller.

• Asian-Australasian Journal of Animal Sciences
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• 제5권4호
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• pp.753-756
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• 1992

Research was undertaken to determine if relectance (interactance) measured with a portable fiver optic probe (Colormet) can be used to assess porcine fat quality. Soft fat generally had lower interactance than hard fat, p<0.05 from 400 to 700 nm, although interactance spectra of hard and soft fat were similar in shape. At $4^{\circ}C$, interactance from 450 nm to 700 nm at the inner layer of backfat was correlated (p<0.01) with subjective soft fat score (r = 0.06 to 0.70), and with the refractive index (r = -0.62 to -0.65) and melting point (r = 0.59 to 0.60) of heat-extracted lipid. Colormet interactance $L^*$ at $4^{\circ}C$ was correlated (p<0.01) with soft fat score (r = 0.72), refractive index (r = -0.66) and melting point (r = 0.61). Interactance decreased as the temperature of the fat was increased from 22 to $44^{\circ}C$ (p<0.01). Soft fat had lower interactance than fats that were slightly soft, slightly hard and hard at 4, 22 and $40^{\circ}C$, although softness and temperature may interact to affect interactance. These results indicate that soft porcine fat may be detected easily by fiber-optic spectrophotometry.