• The Journal of Korean Physical Therapy
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• 제30권4호
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• pp.123-128
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• 2018

Purpose: This study examined the effects of neuromuscular electrical stimulation (NMES) and horseback riding using a robotic device on the trunk muscle activity and gross motor function in children with spastic diplegia. Methods: Children with spastic diplegia were divided into two groups: an experimental group (NMES and horseback riding using a robotic device [n=10]) and a control group (placebo NMES and horseback riding using a robotic device [n=10]). Each group received general physical therapy and occupational therapy. Each intervention involved the administration of NMES for 15 minutes and horseback riding using robotic device therapy for 15 minutes three times a week for 4 weeks. The evaluation included both the rectus abdominis muscles (RA), external oblique muscles (EO), thoracic paraspinal muscles (TP), and lumbar paraspinal muscles (LP) activity and GMFM. Results: The RA, EO, TP, and LP muscle activity, GMFM C, D, and E were increased significantly in the experimental and control groups. A significant increase in both the TP muscle activity and GMFM D was observed in the experimental group compared to the control group. Conclusion: This study showed that horseback riding using a robotic device is an effective intervention for trunk muscle activity and GMFM in children with spastic diplegia. However, if NMES is added to the back muscles, it is possible to further increase the thoracic paraspinal muscle activity and standing ability.

• 융합보안논문지
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• 제11권4호
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• pp.67-75
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• 2011

최근 많은 외산제품들이 국내시장에 유입되고 국내 제품의 출시로 스마트폰 사용자는 급속히 증가하고 있다. 스마트폰 사용자가 증가함에 따라 모바일 악성코드 또한 빠르게 증가하고 있다. 이에 모바일 악성코드에 대한 적절한 대응의 필요성이 증대되고 있다. 단말 관리 방법으로는 SNMP, TR-069 프로토콜이 널리 사용되었지만 이들 프로토콜은 제한적인 관리기능, 이동성 미지원 등으로 인해 모바일 단말 관리에는 적합하지 않다. 모바일 단말 관리 표준인 OMA DM 프로토콜이 대부분의 2G, 3G 무선 단말들의 관리 프로토콜로 채택되고 있으며, 따라서 스마트폰 단말 관리를 위해서도 적합한 프로토콜이라 할 수 있다. 본 논문에서는 악성코드에 대한 현황을 설명하고 스마트폰의 악성코드를 원격제어로 제거할 수 있는 OMA DM기반의 단말 관리 시스템을 설계하였다.

• 보건의료산업학회지
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• 제2권1호
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• pp.28-36
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• 2008

The purpose of this study was effect that get to purchase decision-making factor of medical device decision making. A survey of 262 hospitals to 480 hospitals was conducted from December 3, 2007 to January 4, 2008 in the Busan area. The data generated in the survey was analyzed with SPSS/Win version 10.0 and appropriate tests and statistics including t-tests, ANOVA analyses were used. A summary of the actual results of this analysis are as follows : Of the 262 hospitals surveyed 249(95.1%) were male and 13(4.9%) were female, which shows an absolute higher ration of the male respondents. On a question of Medical device purchase sanction rise 50% occupy. CEO of a hospital($4.58{\pm}.80$) is highest at medical device purchase. The highest factor of medical device purchasing is picture quality($4.86{\pm}.37$), after service($4.84{\pm}.40$), cost($4.36{\pm}.75$). Through the results of the above study, Principle and department influence are put than human relations in the medical device purchase decision making.

• 전기학회논문지
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• 제59권1호
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• pp.220-224
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• 2010

In this study, we designed a device for consecutively observing position, utilizing 3-axises acceleration sensor. This method offer to check his or her wrong position and developed could to help derived a position appliance. And, we developed a Cobb's angle value in three dimensional using 3-axises acceleration sensor. A proposed device with integrated accelerometers, which can detect postural changes in terms of curvature variation of the spine in the sagittal and coronal planes, has been developed with intention to facilitate posture training. The proposed device was evaluated with 3 normal subjects daily activities. We evaluated the performance of our designed device as calculating the correlation coefficients and mean errors between the angle measured by an electro-goniometer and that estimated by a gravity accelerometer and verified the accuracy and sensitivity. The results showed that the angle obtained from the proposed device revealed a linear characteristic at the range of $\pm60^{\circ}$(correlation coefficient 0.99, error range $\pm2^{\circ}$). We demonstrated that our device could detect the changes of the motion in upper trunk accurately. Also, our device showed good potential for treatment of the patients with scoliosis and prevention of the unbalance position during a daily life.

• 한국정보통신학회논문지
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• 제5권3호
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• pp.573-579
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• 2001

소자의 고집적을 위한 특성분석 기술은 빠른 변화를 보이고 있다. 이에 따라 고집적 소자의 특성을 시뮬레이션을 통하여 이해하고 이에 맞게 제작하는 기술은 매우 중요한 과제 중의 하나가 되었다. 소자가 마이크론급에서 나노급 이하로 작아지면서 그에 맞는 소자개발을 위해 여러 가지 구조가 제시되고 있는데 본 논문에서는 TCAD를 이용하여 여러 가지 구조 중에서 고농도로 도핑된 ground plane 위에 적층하여 만든 EPI MOSFET를 조사하였다. 이 구조의 특성과 임팩트이온화와 전계 그리고 I-V특성 곡선을 저 농도로 도핑된 드레인(LDD)MOSFET와 비교 분석하였다. 또한 TCAD의 유용성을 조사하여 시뮬레이터로서 적합함과 나노구조 소자에서의 스켈링이론의 적합함을 보았다.

• 한국전자통신학회논문지
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• 제11권1호
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• pp.59-64
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• 2016

본 논문에서는 주택의 전기화재 방지를 위해 아크고장전류로부터 아크 진단 기능을 가지는 지능형 분전반이 개발된다. 지능형 분전반의 주 제어장치는 단상전력관리를 지원하는 단상 전력관리 장치와 아크전류로부터 아크 고장을 진단하기 위한 아크 진단 장치로 구성된다. 본 논문에서는 단상 전력관리 장치와 아크진단장치의 시작품이 설계, 제작되며, 전기화재의 원인을 분전반으로부터 원격 서버 시스템에 전송하기 위해서 주제어장치와 아크 고장 진단 장치와의 연동기능이 개발된다.

• 한국멀티미디어학회논문지
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• 제16권3호
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• pp.309-317
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• 2013

스마트 디바이스의 보급률 증가로 인해 시간과 공간의 제약이 많은 업무 환경을 효율적으로 활용할 수 있는 스마트워크 모바일 이동근무 환경이 발달하게 되었다. 하지만 업무의 효율성을 높여주는 스마트워크 환경에서도 미인증 디바이스에 의한 정보탈취 등 다양한 보안위협이 존재한다. 특히, 다수의 사용자가 접근하는 스마트워크 환경의 특성상 정당한 사용자에 대한 인증과 디바이스 인증에 대한 문제가 크게 대두되고 있는 실정이다. 하지만 이와 같은 스마트워크 환경에 대한 연구가 초기 단계에 머물러 있으며, 그 중에서도 적합한 사용자 인증 기법과 디바이스 인증에 대한 연구가 부족한 실정이다. 따라서 본 논문에서는 스마트워크 환경에서 USIM을 활용한 사용자 및 디바이스 인증 기술에 대해 제안한다.

• 로봇학회논문지
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• 제17권3호
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• pp.288-295
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• 2022

This study shows a system identification method of a balancing loading device for a stair climbing delivery robot. The balancing loading device is designed as a 2-axes gimbal structure and is interpreted as two independent pendulum structures for simplifying. The loading device's properties such as mass, moment of inertia, and position of the center of gravity are changeable for luggage. The system identification process of the loading device is required, and the controller should be optimized for the system in real-time. In this study, the system identification method is based on least squares method to estimate the unknown parameters of the loading device's dynamic equation. It estimates the unknown parameters by calculating them that minimize the error function between the real system's motion and the estimated system's motion. This study improves the accuracy of parameter estimation using a null space solution. The null space solution can produce the correct parameters by adjusting the parameter's relative sizes. The proposed system identification method is verified by the simulation to determine how close the estimated unknown parameters are to the real parameters.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 II
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• pp.751-754
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• 2003

Metamorphic HEMTs (MHEMTs) have emerged as excellent challenges for the design and fabrication of high-speed HEMTs for millimeter-wave applications. Some of improvements result from improved mobility and larger conduction band discontinuity in the channel, leading to more efficient modulation doping, better confinement, and better device performance compared with pseudomorphic HEMTs. We have studied the calibration on the DC and RF characteristics of the MHEMT device using I $n_{0.53}$G $a_{0.47}$As/I $n_{0.52}$A1$_{0.48}$As modulation-doped heterostructure on the GaAs wafer. For the optimized device performance simulation, we calibrated the device performance of 0.1-${\mu}{\textrm}{m}$ $\Gamma$-gate MHEMT fabricated in our research center using the 2D ISE-DESSIS device simulator. With this calibrated parameter set, we have obtained very good reproducibility. The device simulation on the DC and RF characteristics exhibits good reproducibility for our 0.1-${\mu}{\textrm}{m}$ -gate MHEMT device compared with the measurements. We expect that our calibration result can help design over-100-GHz MHEMT devices for better device performance.ormance.

• 반도체디스플레이기술학회지
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• 제10권1호
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• pp.63-73
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• 2011

Metamorphic HEMTs (MHEMTs) have emerged as excellent challenges for the design and fabrication of high-speed HEMTs for millimeter-wave applications. Some of improvements result from improved mobility and larger conduction band discontinuity in the channel, leading to more efficient modulation doping, better confinement, and better device performance compared with conventional pseudomorphic HEMTs (PHEMTs). For the optimized device design and development, we have performed the calibration on the DC characteristics of our fabricated 0.1 ${\mu}m$ ${\Gamma}$-gate MHEMT device having the modulation-doped $In_{0.52}Al_{0.48}As/In_{0.53}Ga_{0.47}$As heterostructure on the GaAs wafer using the hydrodynamic transport model of a commercial 2D ISE-DESSIS device simulator. The well-calibrated device simulation shows very good agreement with the DC characteristic of the 0.1 ${\mu}m$ ${\Gamma}$-gate MHEMT device. We expect that our calibration result can help design over-100-GHz MHEMT devices for better device performance.