• ICROS
• /
• v.4 no.4
• /
• pp.31-40
• /
• 1998

본 논고에서는 기존의 연속변수영역에서 다루기 어려운 반도체 생산시스템을 대상으로 이산사건 시스템적 접근방법을 통한 동적특성의 분석 및 이를 이용한 내고장성 관리제어와 고장진단 기법 등을 소개한다. 특히, 시스템 운영시 발생가능한 고장을 fault아 failure로 정량적인 구분을 해내고 이를 기반으로 고장에 대한 체계적인 대처방안을 제안한다. 그리고 제안된 이론체계에 대해서 플라즈마 식각공정의 예를 통해 그 논리적 타당성을 검증해 본다.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.20 no.6
• /
• pp.157-169
• /
• 2010

As the information society changes into the ubiquitous computing society, the importance of information security has increased. Governments and enterprises are carrying out various information security activities to operate their information asset effectively. Since 2006, the Korean government has implemented 'Advance Diagnosis' policy to analyze the vulnerability of the information security from the early stage of the information system development to secure the information stability. This study proposes an analyzing framework for the economic effects of Advance Diagnosis for Information Security and presents an illustrative application em a real Advance Diagnosis case. The results of this study can be applied to secure the economic justification of government policies for the security of information systems.

• Journal of the Korean Society of Hazard Mitigation
• /
• v.1 no.2 s.2
• /
• pp.63-74
• /
• 2001

In this paper the feasibility of Nondestructive Damage Detection (NDD) in large structures is demonstrated via simulating vibration monitoring of such structures. The theory of NDD for truss type structures is formulated. To examine the feasibility of the theory, a finite element model of a 3-D truss structure, which consists of sixteen bays and includes 246 elements, is developed to simulate damage. Four damage cases are simulated numerically and the cases range from the structure being damaged in one location to the structure being damaged in three locations. For the given modal parameters, this study reveals very good results for small amounts of damage as well as large damage.

• Proceedings of the Korean Institute of Intelligent Systems Conference
• /
• 2006.11a
• /
• pp.109-112
• /
• 2006

본 논문에서는 PCA에 의한 특징추출과 k-NN과 SVM에 기반을 계층구조의 분류기에 의한 유도전동기의 고장진단 알고리즘을 제안한다. 제안된 방법은 k-NN에 의해 선형적으로 분류 가능한 고장패턴을 분류한 후, 분류가 되지 않는 부분을 커널 함수에 의해 고차원 공간으로 입력패턴을 매핑한 후 SVM에 의해 고장을 진단하는 계층구조를 갖는다. 실험장치를 구축한 후, 다양한 부하에 대하여 몇몇의 전기적 고장과 기계적 고장 하에서 획득한 데이터를 이용하여 제안된 방법의 타당성을 검증한다.

• Archives of design research
• /
• v.19 no.2 s.64
• /
• pp.5-14
• /
• 2006

Visual perception is ability that analyze visual information about things accepting through eyes in central nervous system. That is, it is ability that recognize and discriminates a visual stimulus, and analyzes by combining such stimulus with previous experience. At today, work which clears visual perception obstacle's cause through visual perception test and grasps all special quality of visual perception obstacle's is used method of treating that improve visual perception obstacle by visual perception training program. Present, visual perception test tools using the paper and pens are used mainly on psychological consultation of welfare facilities and education for the handicapped or occupational therapy, but a lot of problems are discovered in it. Therefore, purpose of this paper is to develop prototype of web-based visual perception test program that can construct to database to solve existing problem, and to design graphic item. As a result, classified measurement pattern that can diagnose visual perception by three, and illustrated development direction of graphic item for examination with this. Also, extracted check list item that should consider for design and construction of visual perception test program and the variable for feasibility study of believability, and presented process for prototype development.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.16 no.7
• /
• pp.4478-4488
• /
• 2015

This paper aims to develop and validate a situational judgement test to diagnose the Competencey of public ethics for undergraduates. A criterion group composing of high performers was formed. Critical incidents and responses were developed from interviews with members of the criterion group. Also an expert committee was composed of six university members who have professional knowledge and experience on Competencey based selection or education. This committee reviewed all the items developed and selected some of them for the final test. Item validity and reliability were examined through the final test that 519 college students took. The result of the confirmatory as well as exploratory factor analysis showed that the Competencey of public ethics consisted of 2 sub-elements which were work ethics and democratic citizenship. The correlation between results of the test and the HEXACO model was statistically significant. Overall, the findings of the study highlight that a situational judgement test can be developed and utilized to diagnose Competencey levels of public ethics for undergraduates.

• The Journal of the Korea Contents Association
• /
• v.9 no.5
• /
• pp.24-32
• /
• 2009

Our society is rapidly ageing and income level is rising. With the development of IT-based convergence technology and the construction of infrastructure for the u-healthcare services, the importance of the hand acupuncture prescription has known as the folk remedies is being spotlighted. In this paper, we proposed the hand acupuncture prescription using the personalized symptom according to context in the u-healthcare. The proposed method defined the context and environment of the users and predicted the profited hand acupuncture prescription service according to the personalized symptom using the collaborative filtering. The user gets the accurate hand acupuncture prescription as the personalized symptom to input only the name of a disease in the proposed system. We developed GUI for this purpose, and experimented with it to verify the logical validity and effectiveness. Accordingly, the satisfaction and the quality of services will be improved the hand acupuncture prescription by supporting the context information as well as the personalized symptom.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.20 no.3
• /
• pp.380-387
• /
• 2010

For the fault diagnosis of three-phase induction motors, we propose a diagnosis algorithm based on mutual information and linear discriminant analysis (LDA). The experimental unit consists of machinery module for induction motor drive and data acquisition module to obtain the fault signal. As the first step for diagnosis procedure, DFT is performed to transform the acquired current signal into frequency domain. And then, frequency components are selected according to discriminate order calculated by mutual information As the next step, feature extraction is performed by LDA, and then diagnosis is evaluated by k-NN classifier. The results to verify the usability of the proposed algorithm showed better performance than various conventional methods.

• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• 2006.11a
• /
• pp.680-685
• /
• 2006

Bridges are an integral part of Transportation that is always open to traffic.To effectively manage bridges today, more needs to be done to assess the day-to-day condition and behavior of bridges, and the deterioration rates of their components, so that efficient and proactive measures can be taken. Conventional methods consumemore time and they lack flexibility to reach all locations in high convoluted structures which most bridges offer. Instead, this work uses a new concept of robot, termed as Bridge inspecting robot, which, as its name suggests, possesses superior ability to flex, reach, and approach all points on the bridge. This study also provides economical feasibility model for the same and a comparison with existing bridge inspection and automated inspection work. Finally, we have uncovered few issues and did not analyze some information because of limitation to data.

• Proceedings of the Acoustical Society of Korea Conference
• /
• spring
• /
• pp.353-356
• /
• 2002

심근 경색 및 뇌졸중 등 혈관과 관련된 질환들의 진단 및 치료의 목적으로 미세 크기의 원형 배열 초음파 트랜스듀서가 사용되고 있다. 원형 배열 초음파 트랜스듀서는 종래의 선형 배열 트랜스듀서에 비해 반경 방향의 입체적 진단을 가능케 하고 높은 감도 및 해상도를 구현할 수 있는 장점을 가진다. 본 연구에서는 이러한 원형 배열 초음파 트랜스듀서의 개발을 위하여, 유한요소법 및 이론적인 해석으로 트랜스 eb서의 방사특성을 분석함으로써 무지향성을 이루기 위한 트랜스듀서 내 진동자의 최적 규격을 설정하였다. 나아가 해석 결과에 따라 직경이 약 10mm정도가 되는 알루미나 $Al_2O_3$ 튜브에 32개의 진동자가 원형으로 배열된 트랜스 듀서 시작품의 제작 및 방사특성 측정 실험을 수행함으로써 설계 결과의 타당성을 검증하였다.