• The Transactions of the Korea Information Processing Society
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• v.5 no.12
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• pp.3165-3175
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• 1998

다양한 연구분야에서 웹을 대부분 응용의 프레임워크 또는 GUI 사용하려는 거역할 수 없는 흐름에 발 맞추어 국내에서도 전자상거래와 관련한 법규가 가시화될 전망으로 웹을 이용한 상거래 움직임 또한 더욱 활발할 것으로 보인다. 이와 같이 다양해지는 웹 응용을 위해서는 지금까지의 웹 보안 기술로 부인봉쇄와 같은 보안 서비스를 제공하지 못하고 있다. 본 논문에서는 최근 다양해지는 웹 보안 요구 사항을 만족시키는 프로토콜로 IETF에 의해 제안된 S-HTTP(Secure HTTP, Secure HyperText Transfer Protocol)를 기반으로 하는 웹 시스템인 SecWeb의 개발을 위한 시스템 모델, 구현 환경 및 개발된 시스템 그리고 적용 가능한 시나리오를 기술하였다. 개발된 SecWeb의 대표적인 응용분야로는 전자서명에 의한 부인봉쇄서비스가 중요하게 요구되는 분야들을 생각할 수 있다.

• Nuclear Engineering and Technology
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• v.9 no.2
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• pp.65-74
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• 1977

The radiation-induced graft polymerization of acrylic acid onto polyester fabric was investigated with accelerated electron beams as ratiation source at high dose rates. Homopolymerization was suppressed by addition of cations which is known as homopolymerization inhibitor, but this practical advantage was obtained at the expense of grafting efficiency. The rate of grafting (%/sec) was proportional to the 0.82th power of dose rates over the range from 1.6$\times$10$^{6}$ to 10$\times$10$^{6}$ rad/sec. The grafted polyester fabric showed considerable improvement in moisture regain and antistatic properties.

• Annual Conference on Human and Language Technology
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• 1993.10a
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• pp.71-77
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• 1993

본 논문에서는 대규모 텍스트 데이타 베이스를 구축하거나 전자 도서를 구축할 때 중요한 정보에 관한 파일 구축과 정보 검색시 필요한 자동 키워드 제작기의 설계에 대하여 논하였다. 자동 키워드 제작기는 명사 사전과 조사 사전의 도움을 받아서 명사 및 복합 명사를 추출하고 중요한 키워드를 자동으로 색인하는 과정을 설계하였으며 이들 검색에 필요한 속도 및 정확도 향상에 중점을 두었다.

• Journal of the Korean Institute of Navigation
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• v.14 no.1
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• pp.39-55
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• 1990

Numerical model simulations are conducted for the evaluation of the water level variation in and out of the harbor due to the development and improvement of a harbor. The method used for the numerical analysis is the hybrid element method which includes energy dissipation due to imperfect reflection at the shore boundary and friction at the bottom. The model also includes the radiation condition on the open boundary by the analytic formulation and is applied to a real harbor, Guryongpo Harbor at the east coast of Korea. The result of experiment within the selected wave frequency band shows that the amplification factor out of the harbor is more than 2.0 at 32 sec period and strong responses near 20 sec, 25 sec, 54 sec periods in the harbor. Moreover, simulation results indicate that other longer wave periods affect to the variation of water level and horizontal water particle velocity exist. Thus, it seems to be necessary to modify the planform and the design of the harbor structures for the coming development.

• Korean Journal of Applied Biomechanics
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• v.13 no.2
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• pp.1-12
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• 2003

This study was performed to provide normative isokinetic strength of knee muscles of middle school non-athletic and athletic populations for rehabilitation and pre-season screening for injury prevention. Seven non-athletic subjects and 8 hockey players participated in this investigation. Each subject was tested at speeds of $60^{\circ}/sec$, $180^{\circ}/sec$, and $300^{\circ}/sec$. The free weight of lower leg was measured at speed of $60^{\circ}/sec$ to take gravity effect Into consideration when peak torque of knee muscles occurred. The results showed that the relative peak torque production of knee flexors did not change but the relative peak torque of knee extensors decreased significantly. Mamstring/quadriceps ratios increased mainly due to significant decreases in knee extensors torque production. No significant differences were found between groups. The hamstring/quadriceps ratios for both groups were significantly lower when the gravity effect was not eliminated.

• Journal of Biosystems Engineering
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• v.31 no.3 s.116
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• pp.203-208
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• 2006

This study was conducted to improve the control performance of a current variable-rate controller for granular fertilizers. Simulation model was developed. Optimized proportional, integral and derivative gains were determined by simulation model using 2nd order PID gain learning algorithm, and these control gains were evaluated through the field tests. Important results of this study are as follows; 1. Principles of pre-existing variable-rate application of granular fertilizers were investigated. 2. Simulation model of a PID controller that could simulate the control system was developed by using Matlab/Simulink program. The program was to determine PID control coefficients through the simulation model and 2nd order PID gain learning algorithm. 3. PID control coefficients obtained from the simulation were applied to the developed model. When the step input was given, Maximum overshoot were 1.96%, rise time were 0.05 sec, settling time were 0.06 sec and steady state error were 0.21 % respectively. 4. The simulation model was verified through field tests. The errors of maximum overshoot were 10%, rise time were 0.11 sec, settling time were 0.40 sec and steady state error were 8% because of loads and noises. Rise time was decreased to one third of that of the pre-existing system. 5. If the speed of a fertilizing machine is $0.3{\sim}0.6\;m/s$ and the maximum rotation speed of a discharging roller is 64 rpm, rise time would be 0.26 sec and fertilizing machine would cover the distance of $0.07{\sim}0.15\;m$ with settling time of 0.4 sec, fertilizing machine would cover the distance of $0.12{\sim}0.24\;m$.

• The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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• v.11 no.2
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• pp.40-48
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• 2005

In this study, the muscle strength and endurance of the lumbar at flexion and extension were determined using an isokinetic muscle strength meter (Biodex) in patients with chronic lumbar go (10 male and 10 females), and the changes in muscle strength and endurance of the lumbar at flexion and extension after application of Y-shaped sacrospinalis muscle taping, typically used for patient with lumbar go, were studied. In addition, the sacrospinalis muscle taping of a different shape (I-shaped taping) was applied bilaterally centering on the spine, and the muscle strength and endurance of the lumbar at flexion and extension were determined and compared with those before taping. In addition, the results after application of Y-shaped taping and I-shaped taping were also compared. 1. The extensor muscle strength of the lumbar at loading of $60^{\circ}$/sec before application of kinesio Taping and after application of Y-shaped taping showed the level of significance (p<.05). The flexor muscle strength of the lumbar at loading of $60^{\circ}$/sec before application of kinesio taping and after application of Y-shaped taping did not show the level of significance. 2. The flexor muscle endurance of the lumbar at loading of $90^{\circ}$/sec before application of kinesio Taping and application of Y-shaped taping did not show the level of significance. The extensor muscle endurance of the lumbar at loading of $90^{\circ}$/sec before application of kinesio Taping and after application of Y-shaped taping did not show the level of significance. 3. The extensor muscle strength of the lumbar at loading of $60^{\circ}$/sec before application of kinesio Taping and after application of I-shaped taping showed the level of significance (p<.05). The flexor muscle strength of the lumbar at loading of $60^{\circ}$/sec before application of kinesio Taping and after application of I-shaped taping showed the level of significance (p<.05). 4. The flexor muscle endurance of the lumbar at loading of $90^{\circ}$/sec before application of kinesio taping and after application of I-shaped taping showed the level of significance. The extensor muscle strength of the lumbar at loading of $90^{\circ}$/sec before application of kinesio Taping and after application of I-shaped taping showed the level of significance (p<.05). 5. In comparison between after application of Y-shaped taping and after application of I-shaped taping, the flexor muscle strength of the lumbar at loading of $60^{\circ}$/sec did not show the level of significance. In comparison between after application of Y-shaped taping and after application of I-shaped taping, the extensor muscle strength of the lumbar at loading of $60^{\circ}$/ sec showed the level of significance (p<.05). 6. In comparison between after application of Y-shaped taping and after application of I-shaped taping, the flexor muscle strength of the lumbar at loading of $90^{\circ}$/sec did not show the level of significance. In comparison between after application of Y-shaped taping and after application of I-shaped taping, the extensor muscle strength of the lumbar at loading of $90^{\circ}$/sec did not showed the level of significance (p<.05).

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1989-1990
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• 2008

한의학에서 맥진은 한의사가 손가락으로 환자의 손목의 요골동맥을 짚어 맥박이 손가락에 닿는 느낌에 근거하여 병세를 감별하는 진찰방법으로 인체의 건강상태를 살피고, 정상인의 평맥(平脈)으로부터 환자의 병맥(病脈)을 분석하는 진단법이다. 손목에 있는 요골 경상돌기(styloid preocess) 부근의 볼록한 지점을 고골(高骨)이라하는데 이 돌기를 기준으로 맥이 느껴지는 위치를 검지, 중지, 약지를 이용해 진맥위치를 잡는다. 맥진 시 한의사는 맥진위치에 압력을 서서히 가하면서 손끝에 느껴지는 감각을 이용해 진단한다. 이 과정에서 맥진위치 요골동맥의 혈관이 서서히 occlusion 된다. 본 논문에서는 맥진과정 시 요골동맥의 혈류역학적인 변화를 초음파를 이용해 분석해보고자 한다. 건강한 남자 피험자(34세)를 대상으로 초음파 장비(Voluson 730Pro, GE Medical, U.S.)를 이용해 맥진 위치의 혈관특성을 관찰한다. 혈압계를 이용해 혈관에 압력을 0에서 130mmHg까지 10mmHg씩 단계별로 가압한 후 초음파를 측정한다. 그 결과, 요골동맥에 압력을 가할수록 혈류속도가 서서히 감소함을 알 수 있었으며, 회귀식을 분석할 수 있었다(y = -0.3509x +44.323, $R^2$ = 0.9547). 또한, 가압 단계를 0$\sim$10mmHg, 20$\sim$40mmHg, 50$\sim$70mmHg, 80$\sim$100mmHg 110$\sim$130mmHg으로 가압단계를 나누어 보면, 각 단계별로는 42.32cm/sec, 33.08cm/sec, 24.8cm/sec, 14.3cm/sec, 0cm/sec로 혈류속도가 변화를 보였다. 각 단계별로 혈류속도가 평균 10.58cm/sec의 차이를 보임을 알 수 있다. 본 연구를 통해 가압력에 대한 맥진위치의 혈류변화를 관찰하였다. 그러나 직접 맥진위치를 가압하면서 초음파를 통해 혈류속도를 측정할 수 있는 방법이 없어, 맥진 위치 바로 위쪽을 가압하고 초음파 측정을 하였다. 직접 혈관을 가압하고 그때의 혈류속도를 측정하면 보다 정확히 맥진시의 혈류역학적 특성을 분석할 수 있을 것으로 판단된다. 장비의 고안을 통해 다음 연구에서는 직접적인 가압 후 혈슈속도를 측정해 봄으로써 본 결과와 비교 분석해 보고자 한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.9
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• pp.1778-1784
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• 2016

we improved the performance by parallelizing lane detection algorithms. Lane detection, as a intellectual assisting system, helps drivers make an alarm sound or revise the handle in response of lane departure. Four kinds of algorithms are implemented in order as following, Gaussian filtering algorithm so as to remove the interferences, gray conversion algorithm to simplify images, sobel edge detection algorithm to find out the regions of lanes, and hough transform algorithm to detect straight lines. Among parallelized methods, the data level parallelism algorithm is easy to design, yet still problem with the bottleneck. The high-speed data level parallelism is suggested to reduce this bottleneck, which resulted in noticeable performance improvement. In the result of applying actual road video of black-box on our parallel algorithm, the measurement, in the case of single-core, is approximately 30 Frames/sec. Furthermore, in the case of octa-core parallelism, the data level performance is approximately 100 Frames/sec and the highest performance comes close to 150 Frames/sec.

• Korean Journal of Food Science and Technology
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• v.12 no.1
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• pp.18-23
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• 1980

Rheological behaviors of red pepper paste acre investigated with rotational viscometer at $25{\sim}55^{\circ}C$ and the following results were obtained. 1. At shear rate of $0.323{\sim}1.653\;sec^{-1}$, red pepper paste was found to be a thixotropic food product which showed pseudoplastic proper ties and also exhibited a yield stress and time dependent characteristics. 2. At a shear rate of 0.978 $sec^{-1}$, flow behavior index, consistency index and yield stress were 0.597, 192.3 dyne $sec^s/cm^{2}$, and 91 dyne/$cm^{2}$ respectively. 3. Variation of consistency of red pepper paste with time was found to be decayed by a second order kinetic equation and thereafter nearly time independent. 4. Variation of consistency of red pepper paste with temperature was found to follow Andrade's equation and the activation energy as calculated on the basis of this equation was $1.03\;kcal/g{\cdot}mole$.