• Journal of Sensor Science and Technology
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• v.16 no.1
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• pp.44-51
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• 2007

A hybridized simulator for generating blood pressure waveform is proposed to study the remedy and/or evaluation of the conventional sphygmomanometer utilizing the oscillometric method which is widely applied. The blood pressure of a flowing fluid was controlled for the blood vessel's condition caused by a rhythmical and periodical contraction/relaxation because of the special excitatory and conductive system of the heart. In this study, a hybridized controller composed of the PI feedback controller and the feedforward controller. The inverse dynamics function is proposed to operating the control valve while the pressure is applied in an oil pressure tank. The proposed hybrid simulator reproducing the blood pressure waveform in an artificial blood vessel has kept the control performance consistent over all range. Based on these results, the proposed simulators could be applied to the development and compensation of the non invasive sphygmomanometer type as well as to study the characteristics of the blood pressure and blood vessel.

• Proceedings of the Materials Research Society of Korea Conference
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• 2003.03a
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• pp.218-218
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• 2003

21세기 정보기반사회에서는 정보처리량의 증가로 인한 대용량 정보 교환을 위하여 신호처리의 고속화/광대역화가 요구되어진다. 완전 광통신망의 구축에 의한 대용량의 광통신을 위해서는 고속이며, 집적화가 가능한 저가의 광전자 소자 개발이 필요하다. 광전자 소자 중 전기-광학 변조 효과를 이용한 광소자의 구현을 위한 소재로서 극성 배향된 비선형 광학 유기고분자 소재는 가공성이 뛰어나 원하는 형태의 광도파로로 제조할 수 있다는 장점에 많은 연구가 진행되고 있다. 그러나 아직 전기광학계수의 향상과 더불어 유기고분자가 가지고 있는 열 및 광화학적 안정성이 낮은 기본적인 문제점과 폴링(poling)에 의해 배향된 극성이 시간에 따라 완화되는 문제의 해결이 요구되고 있다. 이러한 문제점 해결을 위한 기초 연구로 유기물을 졸-겔 매트릭스에 나노 사이즈로 분산하는 방법으로 유기물의 내화학적 안정성을 향상하고자 시도하였다. 잘 알려져 있는 바와 같이 유/무기 하이브리드 졸-겔 재료는 광 투광성이 우수하고 저온에서의 재료 합성과 저가 공정이 가능하여 광기능성 유기물의 호스트(host) 재료로 많이 연구되고 있다. 본 연구에서는 MTMS(methyltrimethoxysilane)과 TEOS (tetra-ethoxyorthosilicate)를 0-100 mol%로 혼합하고 가수분해하는 방법으로 친수성/친유성 특성을 제어하여, 분산되는 유기물의 사이즈를 조정하였다. 각 실험 조건에 따른 유기물 분산체의 크기를 SEM 및 TEM으로 관찰하였으며, 나노 사이즈로 분산된 유/무기 졸-겔 코팅막의 광학적 특성을 프리즘 커플러를 이용하여 조사하였다.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.18 no.4
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• pp.165-168
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• 2008

Ta-doped thin films were deposited on quartz and indium-tin oxide glass substrates using a co-sputtering method. The Ta-doped films formed a solid solution that induced structural changes from rutile to anatase phase. The anodic photocurrents of the Ta-doped $TiO_2$ electrodes were observed not only in UV but also in the visible light range. The photocurrent response in visible light on Ta-doped $TiO_2$ films are due to bandgap reduction.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06c
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• pp.217-222
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• 2007

This paper proposes a user interface, on see-through system environment which shows the images via two different cameras, that also ordinary user can control the computer systems or other various processes easily. For that, we include an AR technology to synthesize the virtual button to the image which is captured by the camera real-time. And we were looking for the hand position in the image to judge whether the figure selects the button. And the result of judgment visualizes through changing of the button color. The user can easily interact with the system by selecting the virtual button in the screen with watching the screen and moving her fingers at the air.

• Textile Coloration and Finishing
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• v.30 no.2
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• pp.130-140
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• 2018

In the bio-synthesis of poly(3-hydroxybutyrate)(PHB), which is a kind of poly(3-hydroxyalkanoate)(PHA), aimed to control the low molecular weight of PHB and obtain a telechelic PHB. As a result of incubation of R. eutropha at $30^{\circ}C$ with ethylene glycol added as a chain transfer agent, PHB content on the dry cell weight increased up to 24h, however, it decreased after that, and the molecular weight of PHB increased from 9h to 12h, and then, decreased up to 72h. The decrease of the content and the molecular weight of PHB indicates that PHB was decomposed as an energy source in bacterial cells and was incorporated into metabolic pathways. $^1H-NMR$ of the obtained PHB after incubation for 72h was measured to determine the terminal groups of the PHB during incubation. As the results of $^1H-NMR$ measurement, the peaks derived from ethylene glycol in both terminals of PHB were observed. Which indicate that the terminal reaction was caused by the addition of ethylene glycol, and that telechelic PHB having hydroxyl group at the both terminals where molecular weight was controlled was successfully synthesized.

• Journal of the Korean Society of Systems Engineering
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• v.5 no.1
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• pp.33-41
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• 2009

The analog or partly digital typed interface of main control room in nuclear power plant (NPP) is gradually being replaced to the totally digitalized interface suitable for the digital environment. SKN 3,4 Nuclear Power Plant is currently developed in such a way to employ advanced displays and controls such as computerized procedure system(CPS), large display panel(LDP), and Soft control. According to the developed design process, the main control room (MCR) of the SKN3,4 was aesthetically designed based on a design concept of the health and sustainability and technically evaluated with human factors guidelines, which somehow lack of the confidence on the evaluation for the rapidly changing digital environment. The suitable review guideline for the digitalized interface and the environment was developed such as the guideline for CPS with information displays on VDU. For the guideline development, tremendous guidelines and technical papers related to evaluation issues of digital environment has been collected, analyzed and transformed to electric database forms and then built on database management system, called Design Review Supporting System to retrieve the appropriate issues for the practical usage of evaluators-in-field.

• The Journal of the Acoustical Society of Korea
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• v.21 no.2
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• pp.128-133
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• 2002

We developed a electronic music glove (BMG) system that plays musical scores in real time processing. The EMG system interfaces with the signal coming from the controller to the sound card in the computer, The computer, according to the status of the fingers and foot switches, generates the sound signals and sends them to the speaker systems through the application C++ program and MIDI message. The EMG systems control the velocity and duration of sound and several musical performance expressions such as chorus, reverberation, rhythm, and volume. Finally, we implemented the digital drum set using: the EMG system as example.

• Journal of Korea Multimedia Society
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• v.14 no.11
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• pp.1500-1506
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• 2011

This paper is to propose for the production of a digital-based new interface for the percussion of samulnori which are drum, janggu, jing and kkwaenggwari. Newly designed interface is similar to a jing-shaped percussion, and it was designed to playall of four instruments from a single interface. Two batting sufaces, which are located both in front and at trunk of the interface, generate a hitting date creating when interface to be hit and a pressure data when to grip the handle by control unit located at the handle. The information generated is transmitted to a computer via a wireless communication, and then, the computer generate a synthesized sound based on the characteristic of each instrument.

• Korean Chemical Engineering Research
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• v.47 no.6
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• pp.669-675
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• 2009

A study has been made on the preparation of liquid resin of non-solvent and non-discoloration type for replacement of the soft PVC at room temperature. A new synthetic process was developed by structure-control design of polyurethane synthesis using pre-polymer and polyols as curing agent. The optimum recipe was made according to macro-glycols, molecular weight and reaction conditions, and the final products indicated that the mechanical properties such as tensile strength, tear strength and flexibility was very excellent than PVC products. Also, viscosity, hardness and color operations of the final products can be controlled by this system. And yellowing property by UV and NOx gas was improved from the various additive experiment.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2004.10a
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• pp.476-483
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• 2004

This paper presents a hybrid system combining lead rubber bearings and hydraulic actuators controlled by a μ-synthesis method for seismic response control of a cable-stayed bridge. A hybrid system could alleviate some of restrictions and limitations that exist when each system is acting alone because multiple control devices are operating. Therefore, the overall control performance of a hybrid system may be improved compared to each system, however the overall system robustness may be negatively impacted by active device in the hybrid system or active controller may cause instability due to small margins. Therefore, a f-synthesis method that guarantees the robust performance is considered to enhance the possibility of real applications of the control system. The control performances of the proposed control system are compared with those of passive, active, semiactive control systems and hybrid system controlled by LQG algorithm and an extensive robust analysis with respect to stiffness and mass matrices perturbation and time delay of actuator is performed. Numerical simulation results show that the control performance of the proposed control system is superior to that of the passive system and slightly better than that of the active and semiactive systems and two hybrid systems show similar control performances. Furthermore, the hybrid system controlled by a μ-synthesis method shows the good robustness without loss of control performances. Therefore, the proposed control system could effectively be used to seismically excited cable-stayed bridge which contains many uncertainties.