• Asian-Australasian Journal of Animal Sciences
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• 제3권2호
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• pp.97-102
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• 1990

A procedure to standardize camel carcass fabrication is proposed. This includes a definitive method of jointing the carcass into wholesale neck, shoulder, brisket, rib, plate, loin, flank, rump and leg cuts. Carcass cutout data were collected from the right sides of 21 Najdi male camels averaging 8, 16 and 26 months of age in order to determine the influence of age on the weight of each wholesale cut. The weight of body, empty body, hot carcass, cold carcass, hump fat, kidney, pelvic and heart fat (KPH) and each wholesale cut increased (p < .01) with age. Except for percent shrinkage and wholesale rump weight, all studied traits increased (p < .01) linearly as the age increased. This change was most pronounced in wholesale flank and plate cuts, increasing by 4.2 and 3.4 times, respectively, while the rump and shoulder cuts changed the least, increasing by 1.8 and 1.9 times, respectively. Allometric growth coefficients indicated that as the camel grew, the weight of rib, brisket, plate and flank cuts increased relatively more rapidly than did cold carcass or empty body weight and that the weight of wholesale shoulder, neck, leg and rump increased less rapidly than did cold carcass or empty body weight.

• 한국사이버테러정보전학회:학술대회논문집
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• 한국사이버테러정보전학회 2004년도 제1회 춘계학술발표대회
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• pp.125-130
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• 2004

인터넷은 본질적으로 신뢰할 수 없는 네트워크들의 집합체이다. 인터넷상에서는 정보의 흐름을 통제하기가 대단히 어렵기 때문에, 산재한 자원을 충분히 활용하면서, 내부의 중요한 자원을 인터넷으로부터 보호해 줄 수 있는 보안문제가 심각하게 대두되고 있다. 최근 발생하는 바이러스 사고와 시스템 불법 침입에 대한 발생률이 과거보다 훨씬 높으며 다양해지고 있다. 이러한 시기에 불법 행동을 막기 위한 침입 차단에 대한 연구가 활발하게 진행 중이며 계속적인 발전을 하고 있다. 본 논문에서는 침입자의 불법 행동에 대한 로그 정보를 XML 포맷 형식에 맞추어 관리자에게 통보하고, 원격으로 제어 할 수 있는 침입 차단 시스템을 개발하여 관리측면에서 발생하는 문제점을 해결하고자 하였다.

• 대한토목학회논문집
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• 제12권4_1호
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• pp.1-8
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• 1992

면내거동과 휨거동을 받는 원형구멍을 갖는 유한평판에서 원형구멍 주위의 응력을 모델링하기 위해 p-version 유한요소법이 제시되었으며, 또한 동일한 문제로써 원형구멍으로부터 발생된 균열해석을 위해 균열확장법이 사용되었다. 적분형 르장드르함수에 기초한 p-version 유한요소법이 원형구멍 주위의 응력경사가 심한 기하형상을 모델링하는데 적합함을 보여준다. 한편, 원형 경계조건을 표현하는데 이산화오차를 피하기 위해 초유한사상기법이 사용되었다. 앞에서 제시된 방법을 통한 수치해석 결과는 Nisida, Howland, Newman 등의 실험 및 이론결과와 종래의 유한요소법에 의한 수치해석결과와 비교하여 우수한 값을 보여 주고 있다.

• 한국자동차공학회논문집
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• 제13권5호
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• pp.90-95
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• 2005

Most of mechanical structures are composed of many substructures connected to one another by various types of mechanical joints with various shapes of cutouts. It is important to study these connected structures under dynamic forces for evaluation of stress concentration. In this paper, a FQI(fatigue quality index) analysis using the concept of SF(severity factor) is performed to various shape of elliptical hole. The SF is affected by the location of cutout in plate and radius ratio, static SF is analyzed with finite element analysis and the equation of FQI for predicting a dynamic SF is formed.

• Archives of Reconstructive Microsurgery
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• 제24권1호
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• pp.24-27
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• 2015

During flap elevation, most perforators are cut except one or more perforators that are essential to flap survival. However these cutout perforators can cause deterioration of the blood circulation of the flap. To salvage the jeopardized flaps, rebuilding the perforator system is essential for flap survival. In the first case, after flap elevation, the upper abdominal flap margin was severely ischemic. To supply blood to the upper abdominal flaps, we found and used a major perforator underneath the upper abdominal flap which was cut earlier during the elevation, and we performed reanastomosis with ipsilateral deep inferior epigastric artery. Upper abdominal flap ischemic area was limited to a narrow suture area. In the second case, we performed free superficial inferior epigastric artery (SIEA) flap reconstruction. After successful anastomosis of the SIEA and superficial inferior epigastric vein (SIEV) with internal mammary artery and vein, serious venous congestion occurred immediately because of SIEV malfunction. We found the largest perforator vein under the flap, as an alternate way to drain, then connected it with the thoracoacromial vein with a vein graft harvested in the contralateral SIEV. Circulation has improved. In conclusion, perforator system reconstruction is essential in a jeopardized flap salvage.

• 전기학회논문지
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• 제65권3호
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• pp.526-531
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• 2016

This paper presents an experimental study on the optimal settings for the selected DC fault relay (50F) to improve the operating performance for the high-speed circuit breaker on DC feeding system which ensure safety within rolling stock maintenance depot. In this study, current supplied to overhead contact wire was calculated on 1 ms interval to analyze the correction values of DC fault selective relay for the operation of current supply cutout. Particularly, standards for the accurate detection of accidents between an electric railway vehicle and the electric power facilities are shown by investigating the optimal correction values for detection of fault current, and the results indicated that it takes about 213 ms for the DC fault selective relay(50F) to fully open. In the future, the correction values of DC fault selective relay suggested in this paper will be used as the reference values of protective relay for the safe operation of DC electric railroad system such as urban railway.

• 한국전기전자재료학회논문지
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• 제17권2호
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• pp.171-177
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• 2004

Voltage step-down characteristics in Ring/Dot type piezoelectric transformer were examined as a function of the area of input electrode when the area of output electrode is fixed. The effects of driving frequency and load resistance on the voltage step-down characteristics were also examined. Voltage gain was greatly dependent on the driving frequency and load resistance, and showed a maximum gain at resonance frequency of the step-down transformer. The frequency where the maximum cutout voltage appears increased about 0.2％ as the load resistance increased from 10 to 150 Ω. As the area of input electrode increased, the voltage gain and the efficiency of the transformer increased. Frequency dependence of efficiency of the step-down transformer revealed a similar tendency with the voltage gain curves. The maximum efficiency remarked 94% when the input voltage and the load resistance were 20 Vpp and 120 Ω, respectively.

• Steel and Composite Structures
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• 제28권1호
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• pp.1-11
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• 2018

In this paper, local ratcheting behavior of 1045 steel plates with circular cutout was investigated. Experimental tests were carried out by a Zwick/Roell HB 100 servo hydraulic machine. In order to measure the local strain at notch root, a data acquisition system with strain gauge was used. Various notch diameters and distances of strain gauges mounted from the notch root were found influential in the magnitude of local ratcheting strain. It was found that the local maximum principal stress plays a crucial role in increasing the local plastic deformation. Numerical simulation was done by ABAQUS software using nonlinear isotropic/kinematic hardening model. Material parameters of hardening model were attained from several stabilized cycles of flat specimens subjected to symmetric strain cycles. The nonlinear kinematic hardening model along with the Neuber's rule was employed to assess local ratcheting at the notch root of steel plates. The results of the numerical simulations agreed closely with those measured values in this study. Both ratcheting progress and mean stress relaxation occurred simultaneously at the notch root.

• 한국군사과학기술학회지
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• 제20권6호
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• pp.813-821
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• 2017

This paper presents the study result on a realization of wireless umbilical device for missile systems. In general, a missile system is connected to a fire control equipment via an umbilical connector to get the electrical power for its internal equipment and communicate with each other. And these connectors inherently have many problems of mis-contact between pin and socket, and mis-separation during missile firing, etc. A wireless umbilical device using LC resonance is devised to solve these problems of the current technology. For hundreds of watts power transmission under the missile system environment of restricted space, we designed and made a prototype of wireless umbilical device. And we tested this wireless umbilical device with an aluminum cylinder having cutout windows which simulate missiles. We realized that the wireless technology can be used as a substitute for the conventional umbilical connectors, and EMI and environment tests should be followed further.

• 한국항공우주학회지
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• 제31권7호
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• pp.69-74
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• 2003

Vane tip 개념을 도입하여 소음 특성을 개선하도록 설계된 차세대 로터 블레이드(NRSB-I)의 공력 성능을 기존의 BERP 블레이드와 비교하기 위하여, 제자리 비행에 대한 점성 압축성 계산을 수행하였다. 깃끝 영역의 면적감소에 의하여 설계된 로터 블레이드의 절대 추력이 6-7% 정도 감소하지만, 동력계수의 감소폭이 더 크기 때문에 제자리 비행 성능상의 손실은 거의 없는 것으로 파악되었다. 또한, 깃끝 절단부에서 발생한 와류는 블레이드 표면을 지날 때 확산에 의하여 그 강도가 현저하게 약화되므로, 설계요구조건을 만족시키기 위해서는 절단부 위치에 펜스가 필요함을 확인할 수 있었다.