• Journal of the Earthquake Engineering Society of Korea
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• v.10 no.6 s.52
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• pp.37-46
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• 2006

In this study, the efficacy of the newly developed smart passive control system to improve seismic performance of base isolated building structures is numerically verified. The smart passive control system consists of a magnetorheological (MR) damper and an electromagnetic induction (EMI) part. The damping characteristics of an MR damper can be controlled by the current generated in an EMI part according to the Faraday's law of electromagnetic induction. An EMI part consisting of a permanent magnet and a solenoid coil could substitute a control system including sensors, a controller and an external power supply in a conventional smart control system. The benchmark control problem for a base isolated building presented by the american society of civil engineers is considered for numerical simulation. The control performance of the smart passive control system is compared to that of the conventional smart control system using MR dampers. It is demonstrated from the numerical simulation results that the smart passive control system is useful to improve the seismic performance of base isolated buildings.

• Journal of the Earthquake Engineering Society of Korea
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• v.9 no.1 s.41
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• pp.51-59
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• 2005

Magnetorheological(MR) dampers are one of the most promising semi active control devices, because they have advantages such as small power requirement, reliability, and low price to manufacture. To reduce the responses of structures with MR dampers, a control system including power supply, controller, and sensors is required. However, when a mount of MR dampers are used to a large?scale civil structure such as cable stayed bridges, the control system becomes complex. Therefore, it is not easy to install and maintain the MR damper based control system. To resolve above difficulties, This paper proposes a smart passive system that consists of a MR damper and an electromagnetic induction(EMI) system. According to the Faraday’s law of induction, EMI system that is attached to the MR damper produces electric energy. The produced energy is supplied to the MR damper. Thus, the MR damper with EMI system does not require any power at all. Furthermore, the induced electric energy is proportional to external loads like earthquakes, which means the MR damper with EMI system is adaptable to external loads without any controller and corresponding sensors. Therefore, it is easy to build up and maintain the proposed smart passive system.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.23 no.1
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• pp.27-35
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• 2010

This paper presents the vibration control performance of the smart passive control system to suppress the undesired vibration of the structure subjected to the earthquake loadings. Smart passive control system is the MR damper-based control system augmented with electromagnetic induction(EMI) device which consists of permanent magnets and solenoid coils. According to the Faraday's law of electromagnetic induction, an EMI device produces electrical energy from the mechanical energy due to the reciprocal motions of the structure and provide it to the MR damper. The smart passive control system can be the simple and easy to implement and maintain control system by replacing the feedback control system including sensors, controllers and external power sources of the conventional MR damper-based semiactive control system with the EMI device. The control performance of the smart passive control system is evaluated through the set of shaking table test considering the various historical earthquake loadings.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.3
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• pp.147-153
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• 2014

In this paper, we propose smart emotional lighting control system based on the android platform. The proposed smart emotional lighting control system be configure android platform and sensibility lighting equipment, expansion device, zigbee module. Smart emotional lighting control system based on the android platform is automatic control possible using the illumination sensor, and by selecting the desired lighting partial control can be designed. The experimental results of the proposed smart emotional lighting control sensitivity than conventional lighting control system decreased the power consumption and efficient lighting control was possible. Office acts will be suitable conditions to control the color and brightness, so they can be controlled from the improves concentration and ability to work.

• Journal of KSNVE
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• v.16 no.6 s.84
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• pp.4-10
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• 2006

• Journal of Korean Association for Spatial Structures
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• v.10 no.3
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• pp.49-56
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• 2010

In this study, the control performance of a smart top-story isolation system for tall buildings subjected to wind excitation was investigated. To this end, a 77-story tall building structure was employed and wind loads obtained from wind tunnel test were used for numerical simulations. The top-story of an example structure is separated from the main structure by a smart base isolation system composed of friction pendulum systems (FPS) and MR dampers. The primary purpose of the smart top-story isolation system is to mitigate the dynamic responses of the main structure, but the excessive movement of the isolated top story may cause the unstableness of the building structure. Therefore, the skyhook control algorithm was used to effectively reduce both responses of the isolated top story and the main structure. The control performance of the proposed smart top-story isolation system was investigated in comparison with that of the passive top-story isolation system. It has been shown from numerical simulation results that the smart top-story isolation system can effectively reduce wind-induced responses of the example building structure compared to the passive top-story isolation system with reduction of the top-story movement.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.1
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• pp.199-207
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• 2016

In this paper, we propose efficient smart indoor emotional lighting control system based on android platform using the biological signal. The proposed smart indoor smart emotional lighting control system were configured as the biological signal measurement device and removable smart wall pad, lighting driver, luminaire. The control system was extracts the emotional language by measured the biological signal, and it was transmitted a control signal to each lighting driver using a bluetooth in the wall pad. The lighting driver were designed to control the lighting device through an expansion board by collected control signal and the illuminance information the surrounding. In this case, the wall pad can be selecting of manual control and the bio signal mode by that indoor emotional lighting control algorithms, and it was implemented the control program that possible to partial control by selecting the wanted light. Experiment results of the proposed smart indoor emotional lighting control system, it were possible to the optional control about the luminaire of required area, and the manual control by to adjustable of color temperature with that the efficiently adjustable of lighting by to biological signal and emotional language. Therefore, were possible to effective control for improvement of concentration and business capability of indoor space business conduct by controlling the color and brightness that is appropriate for your situation. And, was reduced power consumption and dimmer voltage, lighting-current than the existing-emotional lighting control system.

• Proceedings of the Korea Information Processing Society Conference
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• 2022.11a
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• pp.749-751
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• 2022

본 논문은 코로나19로 인해 가정에서 생활하는 시간이 길어진 현재 스마트 IoT시스템을 기반으로 각종 환경에 따라 자동으로 창문을 여닫는 "지능제어기를 활용한 스마트 창문"(이하 "윈도우 플러스")을 제안한다. 본 논문이 제안하는 주요한 특징은 다음과 같다. 첫째, 여러 가지 센서와 모터, 라즈베리파이를 이용하여 센서 입력 값에 따라 창문 개폐를 결정한다. 둘째, 안드로이드 어플리케이션과 윈도우 플러스-휴대폰 간 블루투스 통신을 이용하여 창문에 입력되는 대기 환경 수치를 실시간으로 표시한다. 셋째, 실내모드와 실외모드를 구분지어 설정할 수 있으며, 이는 사용자로 하여금 실내 대기 상태를 최적으로 만들 수 있도록 한다. 넷째, 창문의 개폐 여부를 telegram을 통해 사용자가 알 수 있도록 하며, 실내 환경의 보안성을 제공하고. 채팅을 통해 원격제어를 한다. 제안하는 시스템은 기존 수동방식의 창문으로부터 사용자의 편의성을 증가시키고, 자동 환기를 통해 코로나19의 전파를 방지하는데 도움을 줄 수 있는 "윈도우 플러스"의 개발을 목표로 한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.439-440
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• 2022

대부분의 주거환경은 가전제품이나 전등 등을 수동적으로 제어하는 방식이 일반적이다. 본 연구에서는 주거환경을 스마트화함으로써 사용자의 불편함과 번거로움을 줄이고 효율적인 환경관리와 보안을 강화를 할 수 있도록 한다. 본 논문은 아두이노, 여러 센서와 블루투스모듈을 사용하여 집 내부 환경을 자동제어관리하고 사용자가 스마트폰 어플로 집 내부 환경을 파악하고 가전제품을 제어함으로써 편리함을 추구함과 동시에 에너지 절약에 도움이 될 수 있게 한다. 또한 와이파이로 연결된 카메라로 영상을 스트리밍하여 집 내부를 확인하고 대응할 수 있게 하여, 현대인의 집을 스마트하게 관리할 수 있는 "아두이노를 이용한 스마트홈"을 제안한다. 기존의 주거환경과 다르게 집 내부의 환경을 자동제어 및 환경정보를 확인하고 사용자가 직접 가전제품을 제어할 수 있으며, CCTV를 통해 집 내부를 확인 할 수 있도록 한다. 또한 화재가 감지되면 경보와 스프링클러가 작동하여 초기진압을 할 수 있다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.231-232
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• 2019

IoT 산업이 발전하면서, 인간 생활의 3대 요소 중 주거환경 개선을 위한 많은 종류의 스마트 가전제품이 출시되었다. 그 중 스마트 냉장고는 소비자에게 많은 편리함을 제공한다. 하지만 기존에 출시되어져 있는 스마트 냉장고는 아직 스마트폰과 연동되어 다양한 제어를 하는 것이 개발 초기단계에 그쳐있다. 또한 비용적인 부분에서도 소비자가 부담을 느끼게 되므로 이미 출시는 되어있지만 소비자가 사용하기에 대중화되어 있지 않다. 그리고 사용자가 수동적인 제어가 상당부분 필요함으로 판단하여 일반 냉장고와 다를 것이 없다고 판단하였다. 또한 사용자가 장을 볼 때, 이미 구비되어 있는 물품인데도 불구하고 그것을 인식하지 못하여 같은 종류의 식품을 중복되어 구매하는 것이 다반사이다. 또한 음식의 유통기한도 기록하지 않아서 유통기한이 지난 음식을 섭취하고 식중독에 걸리는 일이 종종 발생한다. 이러한 식자재 관리에 대한 피해를 예방하기 위한 연구 과정에서 현대인이 대부분 스마트폰을 사용하고 있다는 사실을 고려하여 터치스크린을 통해 냉장고 안의 식자재를 관리함과 동시에 저장 및 기록할 수 있는 프로그램을 개발하고 추가로 스마트폰에도 동일한 어플리케이션을 개발하여 동시 제어가 가능하도록 설계하였다.