• Journal of Korean Society of Environmental Engineers
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• v.30 no.6
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• pp.609-615
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• 2008

In this study, the design of UV-free reflecting reactor was studied to enhance the cutting fluid life for cutting machine. And also, the stability of cutting fluid with addition of biocide in cutting fluid and without biocide was compared with respect to the cutting fluid concentration, pH changes and microorganisms. Low number of microorganism was observed in the cutting fluid after UV-free reflecting treatment as compare to the cutting fluid which was added biocide and just cutting fluid alone. PH of the cutting fluid after UV-free reflecting treatment was about 9$\sim$8.5 while others were observed considerably low. The oil contents of cutting fluid which was added biocied and pure cutting fluid were almost degraded with the passage of time. However, in case of UV-free reflecting reactor, 4$\sim$3.5 Brix oil contents were observed in the cutting fluid.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.246-247
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• 2015

Type of Automatic Voltage Regulator (AVR) can be divided into Analog and Digital Type. Automatic Voltage Regulator (AVR) of the synchronous generators of the brushless type are to be reduced to the voltage fluctuation on the basis of the total load. The PID control method is a general control technique is commonly widely used. In this study, the control target parameter iPID does not reset the parameters of the controller for the variable (Intelligent PID) using the controller synchronous generator Digital automatic voltage to you like all applied to the adjusting device (AVR) the voltage change is small, improved responsiveness was studied in this controller.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06b
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• pp.120-123
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• 2011

스마트 디바이스(스마트폰, 태블릿PC 등)가 모바일 시장에 핵심으로 떠오르면서 새로운 스마트폰 플랫폼들이 등장하고 있다. 마이크로소프트에서도 스마트폰 경쟁에 뛰어들기위해 스마트폰의 요소를 강화한 윈도우폰 7을 발표하였다. 윈도우폰7 플랫폼이 현재는 스마트폰만 지원하지만 향후에 iOS나 안드로이드와의 경쟁을 위해 다양한 스마트 디바이스를 지원할 수 있을 것으로 예상된다. 그러나 다양한 스마트 디바이스들은 플랫폼은 같으나 디바이스의 용도에 따라 서로 다른 하드웨어 장치와 사용자 인터페이스를 가지고 있기 때문에 애플리케이션 개발에 많은 어려움이 존재한다. 이를 해결하기 위해서는 설계시점에서 다양한 장치들을 반영할 수 있게 모델링이 되어야한다. 이에 본 논문에서는 UML의 확장 메커니즘을 이용하여 윈도우폰7 애플리케이션의 모델링을 위한 확장 프로파일을 정의한다. 이를 위해 윈도우폰7이 가지는 특성을 분석하여 소프트웨어 구성요소와 하드웨어 리소스들을 분류하여 정의하였다. 이에 소프트웨어와 하드웨어 부분을 독립적으로 구현할 수 있으며, 윈도우폰7 플랫폼 기반의 새로운 스마트 디바이스가 출시되더라도 쉽게 확장이 가능하다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.13 no.4
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• pp.113-117
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• 2007

The study was performed on the development of system in which the bead width can be controlled. In order to control the bead width, we designed the automatic seam tracking device by attaching the probe type strain gauge sensor, motor driving slide and encoder to check the moving distance, and interface card connected MCU(80Cl96KC) upside the speed controllable carriage. Seam tracking experiments were done by changing the bead width. We compared and analyzed the sampling data which were obtained by output voltage of strain gauge sensor and rotary encoder pulse every 50ms.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.355-356
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• 2007

21세기는 한국 철도의 르네상스시대라고 부르고 있다. 이는 자동차와 비행기 등 다른 교통수단에 의해 낙후되어있던 철도가 다시 안전하면서도 정확한 운송시간 등으로 그 경쟁력을 확보해가고 있으며 때를 같이하여 고속철도의 개통을 앞두고 있기 때문이다. 이러한 철도의 경쟁력을 강화하는데 크게 기여한 부분 중 하나가 신호 보안장치 즉 열차제어장치의 발전에 있다고 하겠다. 하지만 열차를 제어하기 위해선 실시간격으로 열차의 절대 위치를 알아야만 하는 문제점이 있다. 이를 비교적 쉽게 극복할 수 있는 방법 중 하나가 인공위성을 이용한 통신기술을 이용하는 것이다. 이는 이미 다른 분야에서는 상용화되어 서비스가 이루어지고 있는 GPS(Global Positioning System)이다. 본 논문에서는 열차의 절대 위치를 GPS(Global position system)를 이용하여 구해 보고자 한다. 이를 위해 GPS 신호 추적을 확장형 칼만 필터를 적용하여 열차의 속도 변화에 대한 GPS 신호 추적 루프를 예측 제어함으로써 보다 정확하고 빠른 GPS 위치 정보를 도출하였다.

• Progress in Medical Physics
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• v.9 no.2
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• pp.115-121
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• 1998

In this paper, basic study of diagnostic device development for early detection of cancer, we present the optical property measurements of 12 histologically classified biological tissue and blood specimens in order to determine whether significant optical contrast exists for detection of disease(cancer). In vitro, optical properties of each 630nm, 660nm, 780n, 880nm and 940nm shows consistent changes in effective absorbtion coefficients, ${\mu}$$\_$${\alpha}$/ with tissue classification of pig an chicken and human blood according to the 27.3%, 35.4%, 45.6% and 59.1% of HCT. We found differences in optical properties at each of specific wavelengths and histologically classified biological tissue.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.41 no.6
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• pp.61-66
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• 2004

To make a guide line of property control of angiography equipments, we made standard evaluation sheet forms of facility and management of angiography suite, physical properties of angiography equipments, and image quality of film and then surveyed them at 29 hospital nationwide. Survey and development of standard evaluation sheet form of physical properties of angiography equipments. By using resolution & radiation dose, physical properties of angiography equipments of 49 in number nationwide were evaluated. Most of them (91%) had good performance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.1C
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• pp.94-101
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• 2008

In this paper, we introduce a real-time state-of-polarization(SOP) finding system. The system divides the optical wave into linear horizontal- and vertical-SOP components and measures two different beat-signals, which are produced by superposition with reference optical source, in time domain. From these measured beat signals we can get SOP information of the signal instantly. Since the proposed scheme is a feed-forward measurement system, comparing with conventional systems which require an optical feedback loop, the measurement time becomes reduced tremendously. We also introduced a novel calibration method for compensating birefringence-related errors which may occur during the measurement. We prove the operation and performance of the proposed system through computer simulation and actual experiments.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.26 no.1
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• pp.69-77
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• 2013

When structural design of a tall building is conducted, reduction of wind-induced lateral displacement is one of the most important problem. For this purpose, additional dampers and vibration control devices are generally considered. In this process, control performance of additional devices are usually investigated for optimal design without variation of characteristics of a structure. In this study, multi-objective integrated optimization of structure-smart control device is conducted and possibility of reduction of structural resources of a tall building with additional smart damping device has been investigated. To this end, a 60-story diagrid building structure is used as an example structure and artificial wind loads are used for evaluation of wind-induced responses. An MR damper is added to the conventional TMD to develop a smart TMD. Because dynamic responses and the amount of structural material and additional smart damping devices are required to be reduced, a multi-objective genetic algorithm is employed in this study. After numerical simulation, various optimal designs that can satisfy control performance requirement can be obtained by appropriately reducing the amount of structural material and additional smart damping device.

• Journal of the Society of Disaster Information
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• v.16 no.4
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• pp.824-831
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• 2020

Purpose: In fire case, nursing hospitals are subject to considerable restrictions on evacuation due to the characteristics of occupants and vulnerable elements of buildings, it is important to make evacuation device for vulunerabale person, and need how to intend to increase the efficiency of evacuation by fire and evacuation simulation with helper Method: The smoke characteristics were analyzed by time through fire simulation, finally, the number of helpers according to the day and night was entered, and the evacuation completion time was compared and analyzed using the evacuation simulation. Result: It was found that the evacuation time was shortened by more than 20% when the evacuation assistance device was used for the vulnerable, and the evacuation time was delayed by almost 70% in case of a fire at night compared to the daytime. Conclusion: If the horizontal and vertical evacuation device are effectively utilized in actual fire situations, a strategy appropriate to the situation is deemed necessary. It is expected that evacuation efficiency will increase based on the use of horizontal evacuation evacuation device and vertical evacuation device by developing evacuation manuals