• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2006.05a
• /
• pp.800-803
• /
• 2006

In this paper, we propose a method for improving the performance of the face recognition using a hybrid neural network. The propose method focused on improving face recognition technique using SOM and LVQ. In order to verify the effectiveness of the proposed method, we performed simulations on face database supplied ORL. The results show that the proposed method considerably improves on the performance of the eigenface, hidden markov model, multilayer neural network.

• Journal of the Korea Computer Graphics Society
• /
• v.14 no.4
• /
• pp.1-5
• /
• 2008

In this paper, we propose an efficient technique for improving the grid based fluid simulation by sub-grid visuals. The detailed turbulency generated efficiently by Vortex Particle Method are blended with the flow fields coming from the traditional incompressible Navier-Stokes solver. The algorithm enables large- and small- scale detail to be edited separately.

• The Journal of the Korea Contents Association
• /
• v.13 no.6
• /
• pp.48-54
• /
• 2013

In these days, the state-of-art technologies employ the heterogeneous parallelization of CPU and GPU for fluid simulations in the field of computer graphics. In this paper, we present a novel CPU-GPU parallel algorithm that solves projection step of fluid simulation more efficiently than existing sequential CPU-GPU processing. Fluid simulation that requires high computational resources can be carried out efficiently by the proposed method.

• Proceedings of the Korea Society for Simulation Conference
• /
• 1999.04a
• /
• pp.217-221
• /
• 1999

본 연구는 직렬생산시스템의 제공품(Work in Process Inventory)을 최소화하기 위하여 완충 저장시설의 최적소요 및 배분을 위한 시뮬레이션 모델의 개발이다. 이를 위하여 먼저 목표 생산률을 만족하기 위한 완충저장시설의 총소요산출을 위하여 적정설비배치를 고려한 완충저장시설의 수요 및 적정배분을 함께 고려한 혼합모델을 개발하였다. 먼저 목표생산률의 만족과 적정설비배치를 동시에 고려할 경우, 완충저장시설의 총소요산출을 위한 CAN-WIP 모델을 개발하고 이를 최적 배분하기 위하여 이진탐색(Binary Search)방법과 휴리스틱 방법인 Beam Search 방법을 사용하였다. 이를 기존의 시뮬레이션 모델 (FACTOR/AIM, AutoMod 등)을 사용하여 그 결과를 비교하였다. 이를 위한 전산프로그림을 개발하고 예제를 통하여 그 결과를 보였다.

• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.41 no.5
• /
• pp.51-60
• /
• 2004

Due to the improvements in circuit design and manufacturing technique, the complexity of a circuit is growing. Since the complexity of a circuit causes high frequency of faults, it is very important to locate faults for improvement of yield and reduction of production cost. But unfortunately it takes a long time to find sites of defects by e-beam proving if the physical level. A fault diagnosis algorithm in the Sate level has meaning to reduce diagnosis time by limiting fault sites. In this paper, we propose an efficient fault diagnosis algorithm in the logical level. Our method is hybrid fault diagnosis algorithm using a new fault dictionary and additional fault simulation which minimizes memory consumption and simulation time.

• Journal of Korean Ophthalmic Optics Society
• /
• v.2 no.1
• /
• pp.17-24
• /
• 1997

The Voight function which results from the convolution of the Gauss and Lorentz function is applied the MAS-NMR simulation of mixed alkali glasses and the glasses doped transition metal oxides. It is well known that the convolution of the Gauss and Lorentz function cannot be integrated in closed form for arbitrary values. So we make the new computer simulation program from which the Voight lineshape is obtained. The results are accorded well with the MAS-NMR spectra and we can find out the very small change of MAS-NMR lineshape.

• Journal of Digital Convergence
• /
• v.20 no.2
• /
• pp.525-541
• /
• 2022

This study aimed to develop simulation practice program with PBL (S-PBL) for nursing students and evaluate the effect of the program on their problem solving ability, clinical performance competency, learning satisfaction and confidence. The participants were nursing students who applied for simulation practice courses at an university in J province. The study was a mixed-method design using a nonequivalent one group pretest-posttest design (n=91) and focus group interview (n=12). Quantitative data were analyzed using SPSS 23.0 program and qualitative data thematic analysis. Quantitative data showed S-PBL was effective in improving clinical performance competency, learning satisfaction and confidence of the participants, but not in improving problem solving ability. As a result of the qualitative study, four themes and eight sub-themes were derived, and the themes were "Learn integrated nursing care based on priority", "Experience team cooperation through communication," "Learn vividly critical care" and "Improved nursing competency". The S-PBL could be effective in practical education for nursing students. In further study, it is necessary to develop various simulation practice programs based on PBL through a mixed-method design and apply them to nursing curriculum.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.36 no.12
• /
• pp.1569-1575
• /
• 2012

In this study, ballistic impact effects on a helmet were investigated using the AUTODYN-3D program. Two types of materials were used for manufacturing the helmet: single Kevlar and Steel/Kevlar hybrid composites. Furthermore, two types of bullets were used in the simulation: steel spherical and 7.62 mm full-jacketed. In the simulation, the shape deformation of the projectile and internal energy were calculated. From the results, impact velocities above 655 m/s and 845 m/s were required to perforate the Steel/Kevlar helmet with steel spherical and 7.62 mm full-jacketed bullets, respectively. The results show that there was a large difference between the ballistic resistance of the Kevlar and Steel/Kevlar helmets. For the simulation on an NIJ-STD-0106.01 Type II helmet, a 7.62 mm fulljacketed bullet with a striking velocity of 358 m/s was used. Simulation results show that the Steel/Kevlar helmet could resist a 7.62 mm full-jacketed bullet traveling at 358 m/s.

• Proceedings of the KIPE Conference
• /
• 2016.07a
• /
• pp.505-506
• /
• 2016

본 눈문에서는 대전력 및 고전압 전력변환에 적용되는 3-Level NPC AC/DC PWM 컨버터의 출력 DC 전압의 전체적인 특성 향상을 위하여 PI제어와 모델예측제어의 혼합제어 기법을 제안한다. 혼합제어를 위하여 3-Level AC/DC PWM 컨버터를 모델링하고, PSIM 시뮬레이션을 통하여 제안한 혼합제어 기법의 제어성능을 검토하였다.

• Proceedings of the KIEE Conference
• /
• 2008.11a
• /
• pp.305-306
• /
• 2008

최근 인구 집중현상에 따른 대도시의 전력수요 증가 및 환경적 요인으로 인하여 가공선로의 일부가 지중으로 건설되는 가공 및 지중 혼합 선로가 지속적으로 증가하고 있는 추세이다. 이는 국내뿐만 아니라 전력 선진국 및 신흥 공업국 등의 전 세계 여러 나라에서도 마차가지이다. 한편, 국내 전력산업계의 해외진출 기회가 늘어나고 있으나 해외 전력계통에 대한 기술적 검토 자료가 빈약하여 관련 자료의 확충이 절실히 필요한 실정이며, 가공선로가 아닌 지중선로 특히 지중-가공 혼합선로에 대해서는 기술검토 자료가 전무한 형편이다. 따라서 본 논문에서는 국내 전력기업이 중국과 같은 해외사업 진출시 기술 자료로 활용할수 있도록 중국의 기간 송전망으로 되어있는 220kV 혼합송전선로를 대상으로 EMTP/ATP 시뮬레이션을 통하여 지락고장시 접지방식에 따라 발생 과전압을 검토하여 적절한 접지방식을 찾고자 한다.