• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.105-108
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• 2004

This paper introduces a process of the development of a vibration test dummy for the posture of inclined seating. Experimental devices was invented to measure apparent mass curves on the contact point of the hip and the back of a seated human body. During the excitation of a rigid seat secured to a hydraulic exciter, force and acceleration signals were measured on the contact points to determine the apparent mass. In order to describe nonlinear characteristics of a human body, seven levels of Gaussian random signal were used for the base excitation. The modeling of the human body will be performed using measured apparent mass curves. The modeling will be done by June and the prototype of the test dummy will be invented in the following six months.

• Aerospace Engineering and Technology
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• v.6 no.2
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• pp.1-7
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• 2007

The control design for attitude and yaw rate of 40 % scaled SMART UA Vhas been performed. Analytic selection method for a control gain is proposed to meet the design specification of desired time response considering stability margin. The sliding mode attitude controller is also proposed and compared with the simulation results of a linear controller. Additionally, a velocity and height tracking controller is devised to prepar for the flight test.

• Proceedings of the Korean Nuclear Society Conference
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• 1996.05d
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• pp.494-501
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• 1996

북핵문제 해결의 대안으로 제기된 대북경수로제공 논의에서 우여곡절 끝에 '한국형경수로 제공'과 '한국의 중심적 역할'이 결정되고 이를 주관할 국제 컨소시엄인 한반도에너지개발기구(KEDO)가 구성되어 북한과는 공급협정을, 한국전력공사와는 주계약자지정합의서를 체결함으로써 상업계약 체결에 관계없이 일단 사업 착수를 위한 큰 틀이 갖추어지게 되었다. 이에 따라 울진 3, 4호기를 참조발전소로 한 경수로 2기가 우리의 주도로 2003년을 목표 시한으로 함남 신포 인근에 건설되게 되었다. 부지조사도 대체로 마무리되어, 곧 환경영향평가 작업이 있을 예정이다. 약 45억 달러가 소요될 건설 비용은 한국이 대부분을, 일본이 상당부분을, 미국이 일부를 맡기로 대체로 합의되어 있으나, 최종 확정에 앞서 논란의 소지가 남아 있으며, 사업 참여 지분을 두고도 KEDO 참여국 간에 갈등이 예상된다. 이 사업의 의의는 크게는 어려움을 겪고 있는 북한의 에너지난 타개를 지원함으로써 그들을 개방으로 이끌어 남북간 화해와 세계평화를 조장하며, 작게는 우리의 원자력산업이 세계시장으로 뻗어 나가기 위한 계기를 마련하는데 있다. 이를 통해 포지티브 섬으로서의 통일의 초석을 마련한다는 민족적 대의에 충실하고 국가이익에 좌우되는 신국제질서의 생리를 직시함으로써 남북문제에 있어서는 대승적 자세로, 국가간 경비분담과 지분배분 협상에는 자주적 자세로 임함으로써 모처럼 원자력계에 주어진 막중한 소임을 차질없이 완수할 수 있도록 해야 할 것이다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.220-221
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• 2018

배스보트는 주로 민물에서 낚시를 위해 설계되는 소형 고속 활주형 선박으로 국내에서도 수요가 높은 편이다. 하지만 경기에 참가하는 선수들이 선호하는 17ft급 이상의 배스보트에 대해서는 수입에 100% 의존하는 중이다. 본 연구에서는 18.5ft급 배스보트의 주요요목 결정 및 선형을 개발하고, 선저경사각을 결정하기 위해 상용 CFD코드인 STAR-CCM+ v10.04를 사용하여 수치해석을 수행하여 각 선저경사각별 항주자세 및 저항성능을 분석하여 최적의 선저경사각을 갖는 선형을 도출하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.847-849
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• 2005

본 논문에서는 3차원 객체의 전체적인 기하학적 특성을 3차원 형태 기술자로 추출하는 방법을 제안한다. 제안하는 기술자는 기존의 방법에서 문제가 된 부분적 자세변화에 대한 민감성 부분을 해결한다. 3차원 객체의 평면상의 모든 점들을 대상으로 형태 함수를 이용하여 형태 분포(Shape Distribution)를 생성한다. 이때 평면상의 두 정의 거리를 측정하는 기존의 D2 형태 함수를 최단경로를 사용하여 거리를 측정하는 방법으로 변형해 3차원 객체의 부분적 자세 변화에 강건하도록 하였다. 기존의 형태 분포와 비교하여 성능 평가한 결과 관절 객체에 대해서는 약 $ 51\%$, 전체에 대해서는 약 $24\%$의 성능 향상을 보였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1435-1438
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• 2015

본 논문에서는 대용량의 K-POP 모션캡처 데이터베이스에서 특정 안무구간을 검색하는 방법을 제안한다. 제안 기술은 저가형 3D 카메라를 이용하여 사용자가 직접 검색하고자 하는 동작을 생성하고 이를 질의동작으로 입력하여 원하는 안무동작을 검색하는 직관적인 검색 기술로서 구간 동작의 명칭이 존재하지 않는 K-POP 댄스를 검색하기 위한 핵심기술이다. 역동적인 댄스 자세를 표현하고 매칭하는 방법으로 관절 및 바디파트 간의 상대적인 각도 정보를 추출하고 비교하는 방법을 설명한다. 대용량의 모션캡쳐 데이터베이스를 고속으로 검색하기 위해서 안무동작의 핵심 자세를 분석하여 후보구간 집합을 빠르게 생성하고, 이들 집합에서 Dynamic Time Warping(DTW) 알고리즘으로 안무동작 간의 매칭거리를 보다 정밀하게 산출한다. 약 358분의 K-POP 댄스 곡 100곡에 대한 성능평가에서 92%의 검색정확도를 보였으며, 이는 K-POP 댄스 동작의 복잡성을 고려할 때 경쟁력 있는 성능치이다.

• Journal of radiological science and technology
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• v.31 no.2
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• pp.109-114
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• 2008

There is a standard shoulder oblique method (Grashey method) available to view the shoulder joint. This method projects AP view of the shoulder joint so that the Humerus head's subuxation or joint degeneration can be easily visualized. However, in this view, the patients, with supine or sitting or erect position, have to keep their body obliquely. Whereas, the patients who are not well or operated, usually feel very uncomfortable to keep their body in this position and hence, we need other persons' help and much efforts will be needed to get the good quality shoulder joint view. Therefore, we thought of examining a method which shows the joint well by angling the tube to Medio-Lateral direction and without keeping the patients' one side upward in supine position. For this study, total 15 subjects with no history of neurological or psychiatric illness, were recruited for examinations. They consisted of 9 males and 6 females. Statistic group analysis was performed with ANOVA test. Scores of the evaluation of the experts were $1.10{\pm}0.54$ at $25^{\circ}$, $2.50{\pm}0.50$ at 30^{\circ}$, $2.85{\pm}0.36$ at $35^{\circ}$ and $2.33{\pm}0.47$ at $40^{\circ}$, respectively, and they were significant(p<0.05, Table 1). Joint space of the Humerus head and Scapula were well distinguished at $35^{\circ}$, $30^{\circ}$ and $40^{\circ}$ with the almost same score. However, the degree of distortion at $40^{\circ}$ was more severe than that at $30^{\circ}$. Ultimately, $30-35^{\circ}$ views were shown to yield good quality shoulder oblique images. In conclusion, this method may be very useful for the patients who are uncomfortable and for the emergency patients. In order to get similar or comparable view, the same X-tube angle is recommended to be used before and after the operation. Therefore, we hope that this new angled method seems to be efficient.

• The Korean Journal of Nuclear Medicine Technology
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• v.15 no.2
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• pp.76-82
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• 2011

Purpose: Lymphoscintigraphy is absolutely being used standard examination in lymphatic diagnosis, evaluation after treatment, and it is useful for lymphedema to plan therapy. In case of lymphoscintigraphy of lower-extremity lymphedema, it had an effect on results if patients had not pose same position on the examination of 1 min, 1 hour and 2 hours after injection. So we'll study the methods to improve confidence with minimized quantitative analysis errors by influence factors. Materials and Methods: Being used the Infinia of GE Co. we injected $^{99m}Tc$-phytate 37 MBq (1.0 mCi) 4 sylinges into 40 people's feet hypodermically from June to August 2010 in Samsung Medical Center. After we acquired images of fixed and unfixed condition, we confirmed the count values change by attenuation of soft tissue and bone according to different feet position. And we estimated 5 times increasing 2 cm of distance between $^{99m}Tc$ point source and detector each time to check counts difference according to distance change by different feet position. Finally, we compared 1 and 6 min lymphoscintigraphy images with same position to check the effect of quantitative analysis results owing to difference of amounts of movement of the $^{99m}Tc$-phytate in the lymphatic duct. Results: Percentage difference regarding error values showed minimum 2.7% and maximum 25.8% when comparing fixed and unfixed feet position of lymphoscintigraphy examination at 1 min after injection. And count values according to distance were 173,661 (2 cm), 172,095 (4 cm), 170,996 (6 cm), 167,677 (8 cm), 169,208 counts (10 cm) which distance was increased interval of 2 cm and basal value was mean 176,587 counts, and percentage difference values were not over 2.5% such as 1.27, 1.79, 2.04, 2.42, 2.35%. Also, Assessment results about amounts of movement in lymphatic duct within 6 min until scanning after injection showed minimum 0.15%, and maximum 2.3% which were amounts of movement. We can recognize that error values represent over 20% due to only attenuation of soft tissue and bone except for distance difference (2.42%) and amounts of movement in lymphatic duct (2.3%). Conclusion: It was show that if same patients posed different feet position on the examination of 1 min, 1 hour and 2 hours after injection in the lymphoscintigraphy which is evaluating lymphatic flow of patients with lymphedema and analyzing amount of intake by lymphatic system, maximum error value represented 25.8% due to attenuation of soft tissue and bone, and PASW (Predictive Analytics Software) showed that fixed and unfixed feet position was different each other. And difference of distance between detector and feet and change of count values by difference of examination beginning time after injection influence on quantitative analysis results partially. Therefore, we'll make an effort to fix feet position and make the most of fixing board in lymphoscintigraphy with quantitative analysis.

• The Journal of Korean Academy of Sensory Integration
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• v.16 no.1
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• pp.14-24
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• 2018

Objective : The purpose of this study was to identify the effect of Interactive Metronome (IM) training on postural control and hand writing performance of children with Attention Deficit Hyperactivity Disorder (ADHD). Methods : Participant was a third grade elementary school student diagnosed with ADHD. ABA design was used and a total of 30 sessions were held for 3 sessions every week for a total of 10 weeks. In the intervention period, IM training was conducted for 40~50 minutes before intervention for writing, and the writing task was carried out. We evaluated the handwriting legibility and speed. Before baseline A and within a month after A' phase, Clinical Observation of Motor and Postural Skills (COMPS) was evaluated to examine the changes in postural control of the student. Results : After the IM intervention, the postural control of the student improved in the score of slow movement, finger-nose touching, and asymmetrical tonic neck reflex. The handwriting legibility and speed has also tended to increase during the intervention period, but it has not significantly changed. Conclusion : This study could be used as an evidence that the IM training aimed at postural control and handwriting ability could enhance the ability to improve postural control and thereby provide fundamental knowledge for future studies.

• The Journal of Korean Academy of Sensory Integration
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• v.6 no.1
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• pp.35-46
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• 2008

Objective : This study verifies the effects of sensory integrative (SI) therapy on vestibular- and proprioceptive sensory (BPS) processing ability of a child with Asperger Syndrome (AS). Method : A boy who is 11 years and 2 months old took the Functional Independence Measure for Children (Wee-FIM), Canadian Occupational Performance Measure (COPM), Short Sensory Profile, Bruininks-Oserestky Test of Motor Proficiency-2 (BOT-2), and Test of Playfulness (ToP) for the baseline. The child participated in 3 evaluation sessions and 8 therapy sessions based on the AB research design. Duration of each session is 50 min and the therapy session is divided into 40 minutes for treatment and 10 minutes for evaluation. Since the vestibular sense and proprioception build up one's ability of postural control, several tests were employed to evaluate the child' postural control as outcome measure; distance from front leg of chair to heel of the child with sitting (C-H distance), angle between trunk and thigh (hip joint angle) with sitting, and the 'prone-extension posture' which is a subtest of Clinical Observation of Motor and Postural Skill (COMPS) to examine postural control embodied with integration of reflex and BPS processing. Result : During the therapy, average data of the C-H distance is decreased from 27.33cm to 11.69cm, average data of the hip joint angle is also decreased from $43.3^{\circ}$ to $20^{\circ}$, and average time for the prone-extension posture is increased from 13.15seconds to 24.84seconds. Conclusion : This result indicates that the ability to postural control in sitting and to maintain the prone-extension posture can be improved by sensory integrative therapy, with enhanced BPS processing.