• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.07b
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• pp.946-949
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• 2003

This paper reports on the fluid flow simulation results of a multilayer type piezoelectric valve. The mechanical and fluidic analysis are done by finite element method. The designed structure is normally closed type using buckling effect, which is consist of three separate structures; a valve seat die, an actuator die and a MLCA(Multilayer Type Ceramic Actuator). It is confirmed that the complete laminar flow and the lowest flow leakage are strongly depend on the valve seat geometry. In addition, turbulent flow was occurs in valve outlet according to increase seat dimension, height and inlet pressure. From this, we was deducts the optimum geometry of the valve seat and diaphragm deflection that have an great influence fluid flow in valve. Thus, it is expected that our simulation results would be apply for piezoelectric applications such as valve and pump, fluidic control systems.

• Proceeding of EDISON Challenge
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• 2016.03a
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• pp.256-261
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• 2016

In this paper, Shape optimal design for a chair with 4 legs and 2 stretchers consisting of stainless steel was conducted. The shape was transformed by identifying stress and deformation for the part of leg and stretcher. In addition, load condition and mesh was designed using Hypermesh. The stress analysis was carried out using CSD_Elast that is one of EDISON program. In seat test, Maximum equivalent stress was showed at the contact part between seat and legs. As a result, a leg cross-section with rectangular and arch was designed. And optimal height of stretcher was found to reduce a deformation. Also, maximum deformation was reduced by designing a stretcher with ellipse cross-section. So, Optimal chair having 4 legs with rectangular cross section and 2 stretchers with ellipse cross section was shown to satisfy the safety ratio.

• Proceedings of the KAIS Fall Conference
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• 2012.05b
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• pp.643-645
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• 2012

본 연구에서는 생체용 마그네슘의 국내외 연구 동향을 파악하기 위해 Web of Science 데이터베이스를 사용하여 SCI-E 학술지에 게재된 논문을 조사하여 분석하였다. 생체용 마그네슘합금에 관한 논문이 2005년부터 많이 발표되기 시작하여 2007년을 기점으로 급격하게 증가하기 시작하였다. 따라서 최근 생체 내에서 분해하여 소멸되는 임플란트의 필요성과 함께 마그네슘합금이 최적의 생체재료로 각광을 받으면서 이에 관한 연구가 5~7년 전부터 폭발적으로 활성화되었으며, 중국, 독일, 미국, 그리고 일본이 생체용 마그네슘합금 연구개발에 선도적인 역할을 하고 있음을 알 수 있었다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.1
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• pp.132-141
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• 2015

There might have been weakness in securing user authentication or verification with real time service approach, while existing unimodal biometric authentication has been used mainly for user identification and recognition. Accordingly, it is essential to research and develop ways that upgrade security performance with multi biometric based real time authentication and verification technology. This paper focused to suggest binding assignment and strategy for developing multi biometric authentication technology through investigation of advanced study and patents. Description includes introduction, technology outline, technology trend, patent analysis, and conclusion.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.01a
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• pp.175-176
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• 2021

현재 우리의 사회에는 인간보다 기계가 하는 것이 더 효율적인 일에 대해서 많은 부분이 자동화가 되어가고 있다. 그중 떠오르는 미래산업인 항공산업에서 원활한 이/착륙을 위해 승무원들이 항공기 내부를 돌아다니며 승객과 의자 등받이 체크를 하는 등의 과정에서 번거로움과 어느 정도의 시간이 걸리는 것에 대한 문제를 생각했고, 이 문제를 해결하기 위해 승객 탑승 여부, 승객 착석 여부, 안전벨트 착용 여부를 한눈에 볼 수 있게 표시하고, 승무원과 승객의 불필요한 말과 감정을 만드는 일이 줄어들어 승객과 근무하는 승무원 모두 쾌적하고 원활한 비행을 위해 본 연구를 추진하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.01a
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• pp.75-77
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• 2021

다양한 원인으로 매년 수많은 사람이 교통사고로 목숨을 잃거나 크게 다치곤 한다. 최근 교통사고 통계자료에 따르면 졸음운전으로 인한 교통사고가 음주운전이나, 과속보다도 높은 비중을 차지하고 있었다. 또한, 사고가 났을 때 안전벨트를 매지 않은 운전자나 동승객은 부상 정도가 훨씬 심각한 것으로 알려져 전 좌석에 안전벨트를 꼭 착용해야 하는 법도 제정되었다. 그런데도 많은 운전자 및 동승자가 안전벨트를 착용하지 않아 크게 부상을 당하는 사고는 줄지 않고 있다. 이러한 사고와 부상을 줄이기 위하여 본 논문에서는 다중 네트워크를 이용하여 운전자의 졸음 감지 및 운전자, 동승자의 안전벨트 착용 여부까지 실시간으로 판별하는 시스템을 설계하고 구현한다.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2002.11a
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• pp.487-489
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• 2002

Recently, mobility and accessibility occurs for the elder and the handicapped in the aging problem. In this paper, we analyze the dynamics of slide-up seat, which helps to care the handicapped passenger in and out the automobile when we enjoy trip with the families including the elder and handicapped. We check the trajectories of slide-up seat inside and outside car to protect its corrosion and the stress at the joints of mechanical structure. Those can be helped to keep the safety and accuracy of the multiple dynamic systems for precision quality assurance in mass production.

• Journal of Korea Society of Industrial Information Systems
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• v.17 no.7
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• pp.25-33
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• 2012

This paper deals with the development of automatic docking system for the detachable mobile seat(DMS) of a vehicle for the handicapped people who are unable to ride in a car by oneself. Although such vehicles for the handicapped already exist, there is a need for a vehicle with improved docking method for convenience. This paper presents an automatic docking system using two ultrasonic sensors. In order to identify the precise location of the mobile seat in front of the vehicle door, the capability of ultrasonic sensor for detecting the part edge is analyzed and mathematical modeling is performed to measure the exact location of the side edge. And also, this paper presents an automatic docking method using this sensor system and the car lift which is provided in the inside of the car.

• International Journal of Internet, Broadcasting and Communication
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• v.5 no.2
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• pp.15-17
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• 2013

The web service companies develop the App support technique of the HTML5 base in the smart media system and smart TV competitively while the Web platform of the HTML5 base is legislated with the next generation national standard. It is essential to the web kernel, which is the common library of the operating system including the file, window, resource and network management is provided in order to support the various app developments of the HTML5 base effectually. Additionally, the web application program can support UI/UX function of the desktop user using the web browser and JavaScript drive and administration, window management function, and etc. is needed.

• Journal of Information Technology Applications and Management
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• v.20 no.4
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• pp.33-45
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• 2013

The trend toward ubiquitous computing does not represent simply a change in the way people access and use information. In the end it will have a profound effect on the way people work with each other. In this paper, we have defined functionalities of an information system that helps operate a kind of smart office environment, and implemented the system using RFID technology. The system provides three major functions-time and attendance management, personalized message notification, and flexible seat allocation for a smart working center. We have also suggested the key performance indicators and performed a KPI analysis to measure an efficiency of implemented system.