• 한국응급구조학회지
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• 제22권1호
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• pp.49-59
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• 2018

Purpose: The purpose of this study was to develop an assistant device for the promotion of bag-valve-mask ventilation based on a non-equivalent control group pre-test and post-test design. Methods: The experimental tool was a mask assistance device developed by the researchers. Data were analyzed using SPSS 21.0 with the cardiopulmonary resuscitation (CPR) evaluation program from August 18 to 30, 2016. The research tools included general, hand-related, and ventilation-related characteristics. Results: Before and after using the mask assistance device, the tidal volume increased by 64 mL (p<.001) from 461.76 mL to 525.86 mL. The tidal volume for control was 477.86 mL, and there was a statistical difference (p<.05). The ventilation frequency in device users was 10 times per minute for a total of 20 ventilations with before 10.65 after 10 times, and that of the control group was before 10.36 times after 10 times; there was no difference in both groups(p>.05). The accuracy of the assistance device was $81.72{\pm}30.86%$, which was a very high value. However, the accuracy of ventilation in the control group with no assistance device was $18.97{\pm}32.44%$, which was a very low accuracy rate. Conclusion: This study's results suggested utilizing the newly-developed mask assistance device in CPR, and showed increases in tidal volume and accuracy of ventilation using the bag-valve-mask ventilation equipment. The general and hand-related characteristics did not have any effect, so the use of the device proved to increase the efficacy in all users.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1125-1130
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• 2005

This paper presents a method for inter-sheet spacing control in a flexible media handling device. In order to verify the performance of inter-sheet spacing control by experiment, system of section structure is introduced in the first place. In the introduced system, each section is driven by different servo motor for independent section freedom. And suitable inter-sheet spacing control algorithm that is more optimal than conventional inter-sheet spacing control algorithm is proposed. Finally experiments are performed to confirm the performance of inter-sheet spacing control. And two inter-sheet spacing control algorithms, conventional and proposed, are compared with each other.

• 품질경영학회지
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• 제46권3호
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• pp.411-424
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• 2018

Purpose: The purpose of this study is to improve submarine TACM launcher system safety device performance. Methods: In this study, EPLD(Electrically Programmable Logic Device) control and time sharing method to the safety device actuator motor and discrete signal processor in launch control panel were used to resolve unusual performance of safety system. Results: The result of this study are as follows; First, sporadic stopping of safety device actuator motor due to insufficient In-Rush current was resolved. Second, repeat of safety device condition as lock & release due to chattering for motor activating was resolved. Third, simultaneous release function for safety device actuator was available. Conclusion: The unusual performance of function for submarine TACM launcher system was overcame by applying EPLD control and time sharing method. The suggestions were proved by performance test in the pressure chamber. The results of this study enhanced survivability of ${\bigcirc}{\bigcirc}{\bigcirc}$ class submarine from enemy torpedo.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.893-896
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• 2003

Plasma polymerized para-xylene (PPpX) thin films deposited by plasma enhanced chemical vapor deposition (PECVD) were used to passivate the organic light emitting diodes (OLEDs). For OLEDs, indium tin oxide (ITO), N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-diphenyl-4,4'-diamine (TPD), tris(8-hydroxyquinoline) aluminum $(Alq_{3})$ and aluminum (Al) were used as the anode, the hole transport layer (HTL), the emitting layer (EML) and the cathode, respectively. The OLED device with the PPpX passivation film (passivated device) showed similar electrical and optical characteristics to those of the OLED device without the PPpX passivation film (control device), indicating that the PECVD process did not degrade the performance of the OLEDs notably. The lifetime of the passivated device was two times longer than that of the control device. Passivation of OLEDs with PPpX films also suppressed the growth of dark spots. The density and size of dark spots of the passivated device were much smaller than those of the control device.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권12호
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• pp.4819-4834
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• 2015

The spectral efficiency of cellular networks can be improved when proximate users engage in device-to-device (D2D) communications to communicate directly without going through a base station. However, D2D communications that are not properly designed may generate interference with existing cellular networks. In this paper, we study resource allocation and power control to minimize the probability of an outage and maximize the overall network throughput. We investigate three power control-based schemes: the Partial Co-channel based Overlap Resource Power Control (PC.OVER), Fractional Frequency Reuse based Overlap Resource Power Control (FFR.OVER) and Fractional Frequency Reuse based Adaptive Power Control (FFR.APC) and also compare their performance. In PC.OVER, a certain portion of the total bandwidth is dedicated to the D2D. The FFR.OVER and FFR.APC schemes combine the FFR techniques and the power control mechanism. In FFR, the entire frequency band is partitioned into two parts, including a central and edge sub-bands. Macrocell users (mUEs) transmit using uniform power in the inner and outer regions of the cell, and in all three schemes, the D2D receivers (D2DRs) transmit with low power when more than one D2DRs share a resource block (RB) with the macrocells. For PC.OVER and FFR.OVER, the power of the D2DRs is reduced to its minimum, and for the FFR.APC scheme, the transmission power of the D2DRs is iteratively adjusted to satisfy the signal to interference ratio (SIR) threshold. The three schemes exhibit a significant improvement in the overall system capacity as well as in the probability of a user outage when compared to a conventional scheme.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.813-815
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• 2016

본 논문에서는 뇌파데이터를 기반으로 한 디바이스 제어 시스템을 구현한다. Brain-Computer Interface(BCI) 기술은 언어나 신체의 동작을 거치지 않고 직접 시스템에 전달할 수 있다. 상태의 변화에 따른 뇌파를 실시간으로 감지하여 디바이스를 제어함으로써 움직임이 불편한 장애인이나 수험생, 멀티태스킹이 필요한 사람 등 다양한 서비스 대상자에게 편리한 생활을 할 수 있도록 도와준다. 또한, 홈 디바이스 제어 시스템 등 응용서비스를 개발할 수 있다. 이를 위해 논문에서 구현한 디바이스 제어 시스템은 뇌파 측정 헤드셋으로부터 수집된 데이터를 기반으로 사용자의 스마트폰과 연동하여 전원 및 오디오를 제어한다. 집중도에 의해 전원 ON/OFF 동작을 제어하고, 명상도와 눈 깜빡임에 의해 오디오를 제어하는 서비스 기능을 지원한다. 실험실 테스트를 통해 뇌파데이터를 이용한 디바이스 제어가 성공적으로 동작되는 것을 확인하였다.

• 전력전자학회논문지
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• 제8권3호
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• pp.253-259
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• 2003

현대는 인터넷 시대라고 하여도 과언이 아닐 만큼 인터넷은 실생활에 큰 비중을 차지하고 있다. 즉 네트워크를 통한 기기관리 및 제어방식도 인터넷의 출현으로 인해서 큰 변화를 맞이하고 있으며, 기기에 이상이 생겼을 경우 관리자가 직접 관리기기가 있는 현장으로 가야만 했던 과거와는 달리 인터넷을 사용함으로서 거의 실시간으로 관리기기의 상태를 파악하고 문제를 해결, 보완함으로서 엄청난 시간과 비용을 절약할 수 있다. 전기기기 분야뿐 아니라 모든 분야에서 인터넷을 통해 기기를 직접 제어, 관리하는 기술은 이제 시간과 비용절감의 측면에서 필수적인 요소라고 할 수 있다. 본 연구에서는 가장 저렴한 비용으로 E-SERVICE 시스템 구축 및 U-SERVICE 대응이 용이도록 하드웨어 형태의 인터넷 접속장치인 HelloDevice(HD1300)를 채택하였고, HelloDevice는 기기를 제어하는 O/S로부터 인터넷과의 통신부분을 분리해냄으로서 효율적인 관리제어환경을 만들어 주고 또한 사용자 기기에 쉽게 장착할 수 있도록 충분히 작으며 (명함의 1/3크기), 응용 소프트웨어 제작 툴인 IDE(Intergrated Development Environment)지원이 가능하므로 사용 및 적용이 매우 간단하다. 여기서는 그 사용자기기 적용 예로 UPS를 사용하여 관리자가 인터넷을 통해서 HelloDevice에 접속, UPS를 관리, 제어할 수 있도록 하였다.

• 제어로봇시스템학회논문지
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• 제15권3호
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• pp.315-322
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• 2009

This paper explains a control and navigation algorithm of a 6-DOF gait rehabilitation robot, which can allow a patient to navigate in virtual reality (VR) by upper and lower limbs interactions. In gait rehabilitation robots, one of the important concerns is not only to follow the robot motions passively, but also to allow the patient to walk by his/her intention. Thus, this robot allows automatic walking velocity update by estimating interaction torques between the human and the upper limb device, and synchronizing the upper limb device to the lower limb device. In addition, the upper limb device acts as a user-friendly input device for navigating in virtual reality. By pushing the switches located at the right and left handles of the upper limb device, a patient is able to do turning motions during navigation in virtual reality. Through experimental results of a healthy subject, we showed that rehabilitation training can be more effectively combined to virtual environments with upper and lower limb connections. The suggested navigation scheme for gait rehabilitation robot will allow various and effective rehabilitation training modes.

• 제어로봇시스템학회논문지
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• 제20권10호
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• pp.1036-1043
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• 2014

In this paper, a new haptic device is proposed for the teleoperation, which can recognize the invisible environment of a mobile robot. With this new device, it is possible for the user to identify the location of an obstacle and to avoid it. The haptic device has been attached on the top of a joystick so that the user can remotely control the mobile robot to avoid the obstacles which are recognized by the ultrasonic sensors. Also, the invisible environment is recognized more accurately overlapping the data from the ultrasonic sensors. There are five vibration motors in the haptic device to indicate the direction of the obstacle. So the direction of the obstacle can be recognized by the vibration at the finger on each vibration motor. For various situations and surrounding environments, experiments are performed using fuzzy controller and overlapping ultrasonic sensors. The results demonstrate the effectiveness of the proposed haptic joystick.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 춘계학술대회
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• pp.575-577
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• 2013

WiFi 무선 통신 기능을 갖춘 스마트폰을 비롯한 각종 가전 도구들이 시장에서 일반화되면서 WiFi AP(access point)를 통해서 무선 랜을 구축하고자 하는 수요가 증가하고 있다. 또한 최근 들어 AP의 가격이 저렴화 되면서 AP를 이용하여 주차 위치를 알려주는 등 다양한 서비스를 제공하려는 시도들이 생겨나고 있다. 본 논문에서는 제어 기능과 위치 정보 제공 기능을 갖춘 AP를 기반으로 하는 제어 시스템을 개발한다. 제안하는 제어 시스템은 외부 장치 제어 기능과 스마트폰 위치 확인 기능이 있는 AP와 AP들을 제어하고 수집된 정보들을 처리하는 AP 서버, 사용자들에게 서비스를 제공하기 위한 스마트폰용 응용 프로그램으로 구성된다.