• Journal of Korean Institute of Industrial Engineers
• /
• v.19 no.4
• /
• pp.3-11
• /
• 1993

We propose a new dual simplex method using a primal interior point. The dropping variable is chosen by utilizing the primal feasible interior point. For a given dual feasible basis, its corresponding primal infeasible basic vector and the interior point are used for obtaining a decreasing primal feasible point The computation time of moving on interior point in our method takes much less than that od Karmarker-type interior methods. Since any polynomial time interior methods can be applied to our method we conjectured that a slight modification of our method can give a polynomial time complexity.

• Proceedings of the KIEE Conference
• /
• 1998.07a
• /
• pp.175-178
• /
• 1998

To analyze and design a motor magnetic permeance method and numerical methods such as F.E.M. are used. In this thesis, DC motor is analyzed and designed by the permeance method. Modified Carter coefficient and leakage permeance are presented. A magnetic flux path can be approximated properly by using a equivalent ${\pi}$ network representation adding the leakage coefficient. Finally, effective and easy-to-use program is realized. Experimental analysis and design with an actual motor proves that this program produces reliable results. There are many experimental coefficients in this algorithm and it makes some design errors. Using of this program, an motor engineer can obtain satisfactory characteristic and design value by inputting initial data at once.

• Proceedings of the KIPE Conference
• /
• 2007.07a
• /
• pp.418-420
• /
• 2007

When the magnetic levitation system(MAGLEV) initially rise, The MAGLEV has a weak point that is very large variation of the electric current. In this paper, The author applied the multi-loop-control to stably control the magnetic levitation system(MAGLEV). The gains of the control algorithm were selected based on pole locations formulated from a prototype Bessel transfer function model. The design incorporate tradeoffs in DC-to-DC converter hard-ware para-meters and pole locations. In order to confirm the superiority of the proposed pole selection and controller, MATLAB simulation and experiment results are presented.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2018.10a
• /
• pp.463-466
• /
• 2018

본 연구는 논문을 기반으로 연구의 주요 키워드를 추출하는 알고리즘을 설계하고 이를 적용한 연구 검색 시스템을 개발하여 효율적인 검색 환경을 제공하는 것을 목표로 한다. 논문 키워드 추출 알고리즘은 논문 내에서의 단어 출현 빈도와 PMI 지표를 바탕으로 정의한 단어간 연관성 K(x,y)을 기반으로 설계하였다. 연구 검색 시스템은 고등학교 R&E 등 제한적인 환경에서 이루어지는 연구들의 선행 연구 자료 부족을 해결하는 것을 주 목적으로 한다. 또한, 구현한 연구 검색 시스템에 제안된 알고리즘을 적용하여 보다 정확하고 직관적인 검색 환경을 제공할 수 있었으며, 추후 연구 자료가 추가됨에 따라 그 가치가 높아질 것으로 전망한다.

• Proceedings of the KIEE Conference
• /
• 1993.07b
• /
• pp.932-934
• /
• 1993

Optimum pole shape is designed to increase the levitation and propulsion force of magnetic levitation systems. Evolution Strategy is introduced as optimization method. Evolution Strategy is random based non-deterministic method, developed by combining Genetic Algorithm with Simulated Annealing. Trasnsrapid-06, which was developed in Germany, is referenced model to be analyze. Design variables are nodes which determine fields pole shape of a linear synchronous motor, and the model analyzed by F.E.M.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2015.10a
• /
• pp.1309-1312
• /
• 2015

본 논문에서는 현대 자율 주행 차량 경진대회에 적용되었던 LIDAR 기반의 다중 물체 추적 알고리즘을 소개한다. 물체 추적은 자율 주행 차량이 외부 환경을 인지하는데 중요한 역할을 한다. 본 논문의 물체 추적 알고리즘은 동시에 여러 개의 물체를 추적할 수 있도록 Multiple Data Association 방식을 사용하였고 순수하게 LIDAR만으로 동작하기 때문에 밤과 낮 모든 경우에 적용 가능하다. 알고리즘은 Clustering, Data Association, State Estimation, Data Arrangement 총 4단계로 이루어져 있으며 본 논문에서는 각 단계별로 알고리즘의 동작 방식을 소개한다. 실제 구현에는 Velodyne사의 HDL-32e이 사용되었고 실제 주행에서 교차로 내의 차량 추적 및 선행 차량의 동향을 추적하는데 적용되었다.

• Proceedings of The Korean Society of Agricultural and Forest Meteorology Conference
• /
• 2019.08a
• /
• pp.154-154
• /
• 2019

• Proceedings of the Korea Information Processing Society Conference
• /
• 2013.11a
• /
• pp.800-803
• /
• 2013

이메일을 기반으로 좀비PC 및 봇넷그룹을 탐지하는 알고리즘은 기존에 연구가 되었으나, 기존의 검증방식은 가상의 메일계정을 이용해 스팸메일을 수집하는 스팸트랩 시스템에서 추출한 이메일을 대상으로 하였다. 본 논문에서는 상용환경의 이메일을 대상으로 좀비PC를 탐지하고, 좀비PC를 이용한 추가 사이버 공격을 예방하기 위해 기존의 알고리즘을 보완하고, 이에 대한 좀비PC 탐지결과를 분석한다. 이를 통해, 주요 포탈 및 기업의 메일서버에서 수신하는 이메일을 대상으로 좀비IP를 탐지하여, 스팸메일을 차단하고 ISP와 연계하여 실제 조치를 유도할 수 있을 것으로 기대한다.

• International Journal of Computer Science & Network Security
• /
• v.21 no.2
• /
• pp.198-204
• /
• 2021

Glioma is one of the common types of brain tumors starting in the brain's glial cell. These tumors are classified into low-grade or high-grade tumors. Physicians analyze the stages of brain tumors and suggest treatment to the patient. The status of the tumor has an importance in the treatment. Nowadays, computerized systems are used to analyze and classify brain tumors. The accurate grading of the tumor makes sense in the treatment of brain tumors. This paper aims to develop a classification of low-grade glioma and high-grade glioma using a deep learning algorithm. This system utilizes four transfer learning algorithms, i.e., AlexNet, GoogLeNet, ResNet18, and ResNet50, for classification purposes. Among these algorithms, ResNet18 shows the highest classification accuracy of 97.19%.

• Proceedings of the ESK Conference
• /
• 1993.04a
• /
• pp.18-26
• /
• 1993

When designing workplaces, controls should be placed within the reach of operator's arm or foot to guarantee effective performance. The aviation industry is perhaps the chief user of anthropometric data for its need to weight minimization and space optimization. In designing a workplace which must cater to a wide range of operator size, it might be sufficient to plan only for the 'average person'. Static arm reach measurements which are taken in conventional, standardized positions provide the necessary information, but they cannot be directly applied to dynamic situations. In this research, an approximate algorithm to generate the workspace of the human body including foot reach and trunk motion is proposed and tested. The robot kinematics was employed to represent the human body as a multi-link system.