• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• v.4 no.1
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• pp.114-123
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• 1993

The authors applied Toddler Temperament Scale(TTS) to ADHD patient group, other disease group and normal control group to elucidate temperamental characteristics of ADHD patients in their toddler stage. 1) ADHD group showed significant difference from the control group in 'activity', 'rhythmicity', 'approach', 'adaptability', 'intensity', 'persistence' and 'threshold' categories. 2) ADHD group and other disease showed significant difference from the control group in 'adaptability' and 'persistence' categories. 3) ADHD group was significantly different from other disease group or control group in 'activity' and 'approach' categories. 4) In total scores of TTS, ADHD group and other diease group showed significant difference from control group. 5) Classification ratio of TTS for ADHD by discriminant analysis was 84.3%. Above results suggest that the ADHD patients may reveal characteristic traits in their toddler stage Further research should be focused on the development and refinement of assessment tools for the early detection and prevention for ADHD.

• 한국노년학
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• v.40 no.1
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• pp.91-109
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• 2020

This study aims to investigate the interdependence of Korean middle and old-aged couples in the association between exercise and life satisfaction through grip strength trajectory. Data were drawn from the nationally representative Korea Longitudinal Study of Aging (KLoSA) collected from 2006 to 2016. The sample included couples over 45 years of age in the first wave and participated in all six waves of the survey (Ncouple=1,997). There were three steps for analyses: correlation, parallel latent growth curve model, tests of indirect effects of the mediation paths. Covariates included in the models were husbands and wives' characteristics (age, education, work status, chronic diseases, marital satisfaction, contact frequency with friends or neighbors) and couple's household income. Results showed husbands' and wives' life satisfaction and grip strength were interdependent upon each other. Also, exercise participation of both husbands and wives was associated with both husbands' and wives' life satisfaction via the initial level of grip strength of husbands. Moreover, exercise participation of only husbands was associated with wives' life satisfaction through the initial grip strength of husbands. These results suggest the aging processes of middle and old-aged couples need to be understood in the context of gender dynamics and couple interdependence.

• Journal of the KSME
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• v.34 no.3
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• pp.168-176
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• 1994

축 이송운동의 오차를 측정할 수 있는 광전소자 측정시스템이 구현되었으며, 결론은 다음과 같다. 1) 광전소자와 레이저광원을 이용하여 축이송시에 발생하는 5개의 운동오차를 동시에 검출하는 측정방법이 개발되었으며, 이때의 정밀도는 마이크로미터오더이다. 2)광전소자에 대한 2차원 칼리브레이션이 수행되었으며, 비선형성을 고려할 때 더욱 정밀한 측 정값을 얻을 수 있었다. 3) 레이저간섭기 등에 의해서 측정이 어려운 롤(roll)오차의 측정방법이 구현되었으며, 이때 빔 분리기의 오차를 칼리브레이션할 때, 정밀한 측정값이 얻어질 수 있었다. 4)광전소자측정시스템을 마이크로 컴퓨터와 연계함으로써, 종래의 측정방법보다 매우 빠르며, 정밀한 측정시스템이 구현되었다.

• Investigative Magnetic Resonance Imaging
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• v.4 no.1
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• pp.14-19
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• 2000

Purpose : This study was to present the functional brain mapping of both functional magnetic resonance imaging(MRI) and transcranial magnetic stimulation(TMS) in a case of schizencephaly. Materials and methods : A 28-year-old man, who had left hemiplegia and schizencephaly in right cerebral hemisphere, was exacted with both functional MRI and TMS. Motor function of left hand was decreased whereas right hand was within normal limit. For functional MRI, gradient-echo echo planar imaging($TR/TE/{\alpha}$=1.2 sec/90 msec/90) was employed. The paradigm of motor task consisted of repetitive self-paseo hand flexion-extension exercises with 1-2 Hz periods. An image set of 10 slices was repetitively acquired with 15 seconds alternating periods of task performance and rest and total 6 cycles (three ON periods and three OFF periods) were performed. In brain mapping, TMS was performed with the round magnetic stimulator (mean diameter; 90mm). The magnetic stimulation was done with 80% of maximal output. The latency and amplitude of motor evoked potential(MEP)s were obtained from both abductor pollicis brevis(APB) muscles. Results : Functional MRI revealed activation of the left primary motor cortex with flexion-extension exercises of healthy right hand. On the other hand, the left primary motor cortex, left supplementary motor cortex, and left promoter areas were activated with flexion-extension exercises of left hand. In TMS, magnetic evoked potentials were induced in no areas of right cerebral hemisphere, but in 5 areas of left corebral hemisphere from both abductor pollicis brevis. Latency, amplitude, and contour of response of the magnetic evoked potentials in both hands were similar. Conclusion : Functional MRI and TMS in a patient with schizencephaly were successfully used to localize cortical motor function. Ipsilateral motor pathway is thought to be secondary to reinforcement of the corticospinal tract of the ipsilateral motor cortex.

• Journal of the Korean Institute of Intelligent Systems
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• v.26 no.2
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• pp.147-152
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• 2016

Shape Memory Alloys (SMAs) undergo changes in shape and hardness when heated or cooled, and do so with great force. Since wire-type SMAs contract in length when heated and pull with a surprisingly large force and move silently, they can be used as actuactors which replace motors. These SMA actuators can be heated directly with electricity and can be used to create a wide range of motions. This paper presents the mechanical design and control for a three fingered, six degree-of-freedom robotic hand actuated by SMA actuators. Each finger has two joints and each joint is actuated with two tendons in the antagonistic manner. In order to create the sufficient force to make the smooth motion, the tendon is composed of two SMA actuators in parallel. For controlling the current to heat the SMA actuators, PWM drivers are used. In experiments, the antagonistic interaction of fingers are evaluated.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.426-429
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• 2016

본 논문에서는 기 연구된 비만환자를 대상으로한 다양한 운동 변인별 효과크기 메타 분석 데이터를 활용하여 DB를 설계하고, 설계된 DB를 사용하여 사용자들에게 다양한 조건별 상황에서 최적의 운동처방을 효과적으로 표현할 수 있는 운동처방 알고리즘을 제안한다.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2012.05a
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• pp.378-385
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• 2012

Vent mixer can provide main flow directly into a recirculation region downstream of the mixer to enhance fuel-air mixing efficiency. Based on experimental results of three-dimensional velocity, vorticity and turbulent kinetic energy obtained by a stereoscopic PIV method, the performance of the vent mixer was compared with that of the step mixer which was used as a basic model. Thick shear layers of the vent mixer induced the increase of the penetration height. The turbulent kinetic energy mainly distributed along a boundary layer between the main flow and the jet plume. This turbulent field activates mass transfer in a mixing region, leading to the mixing enhancement.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1996.04a
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• pp.82-82
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• 1996

후두전적출술은 상부 소화관의 연속성을 변형시킴으로써, 식도운동의 장애를 가져올 수 있으며, 술 후에 연하곤란을 호소하는 경우는 10% 가량 된다. 본 연구의 목적은 식도내압검사를 통하여, 후두전적출술이 상부식도괄약근의 휴지기와 최대 압력에 어떠한 변화를 주는가 및 술 후 인두와 상부식도괄약근의 조화성 여부와, 만일 상부식도괄약근의 기능에 변화가 생긴다면, 그 영향이 식도체부 및 하부식도괄약근의 운동성에 어떠한 영향을 주는지를 알아보기 위함이다. 식도내압검사는 8개의 내관을 가진 폴리에틸렌 도관으로, 후두전적출술을 받은 환자군 14명과 정상인 12명을 대상으로, stational pull-through 방법으로 시행하였다. 환자군에서 상부 식도괄약근은, 휴지기 압력, 최대 수축압력, 이완정도, 괄략운동의 조화성 및 괄약근의 길이 등이, 정상 대조군 보다 의미있게 감소되었다. 환자군에 있어서 식도체부의 운동성은 주로 근위부 식도체부에서, 수축력, 수축기간 및 연동파의 전파시간이 대조군에 비하여 의미있게 감소되었고, 연동운동시 동시 수축도 3례에서 관찰되었다. 하부 식도괄약근의 기능은 환자군과 대조군이 의미있는 차이를 보이지 않았다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.1139-1140
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• 2011

본 논문에서는 사용자의 스마트폰을 개인을 식별하는 인증장치(Handle)로 사용하고 이 장치를 통해 체지방 분석, 건강관리 전문가의 처방기록을 받고 받은 기록을 바탕으로 운동기구들과 Wi-Fi 통신을 통하여 운동량을 측정 및 관리하는 구현을 하였다. 건강관리 전문가의 처방을 통해 사용자의 최적화된 운동량을 체크하여 효율적인 운동을 한다. 본 시스템은 체지방 측정기계와 전문가의 측정 결과를 수치화 하고 운동기구들의 이용 횟수를 데이터베이스에 구축하고 자동 스케줄 관리를 한다.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2003.04a
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• pp.56-61
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• 2003

본 논문은 초정밀 가공기에 적용 가능한 6자유도의 운동이 가능한 초정밀 스테이지의 설계를 기술한다. 본 초정밀 스테이지는 특히, 광학을 이용한 가공기와 절삭력이 작은 가공기에 적합하다. 스테이지는 장행정 · 단행정 스테이지로 구성된 이중 서보를 채택한다 장행정 스테이지는 초정밀 운동에 방해가 되는 운동을 줄이며 높은 효율을 갖는 다극 자석 배열을 이용한 선형모터를 사용한다. 그리고 단행정 스테이지는 장행정 스테이지와의 기계적 결합에 의한 구조적 영향성을 없애는 개념을 적용할 수 있는 보이스 코일 모터을 이용한다. 그리고 각 구동부는 최상의 성능을 유지할 수 있도록 최적설계를 수행한다.