• 대한정형도수물리치료학회지
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• 제29권1호
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• pp.33-39
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• 2023

Background: Most Pilates programs for older adults have been based on mat Pilates, and there has been limited research on Pilates with mini-balls. Therefore, this study aims to compare the effects of Pilates with mini-balls and mat Pilates interventions on strength, total body endurance, flexibility, and dynamic equilibrium to determine the differences. Methods: The elderly aged 65 or older living in Gyeongsan, Daegu, were divided into two groups, and the experimental group (n=10) conducted a Pilates exercise program using mini balls for 12 weeks, and the control group (n=10) conducted a mat Pilates exercise program for 12 weeks without mini balls. Strength, endurance, flexibility, and dynamic equlibrium were measured as a pre-test, and post-test was performed in the same way after 12 weeks of application. Results: Comparing the mini-ball Pilates group to the mat Pilates group, there was a significant difference (p<.05) in the 'chair sit and reach' after the intervention. In the within-group comparison, there was a significant increase (p<.05) in 'arm curl right', '30-second chair stand', '2-minute walk', 'back scratch', 'chair sit and reach', and '2.44m up and go' in the experimental group using the mini-ball Pilates program. Mat Pilates program significantly increased the within-group comparisons in '30-second chair stand' and 'chair sit and reach' (p<.05). Conclusion: It is suggested that mini-ball Pilates has a positive effect on the senior fitness and will be a good exercise method for using it as an exercise program for the elderly in the future.

• 한국군사과학기술학회지
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• 제18권4호
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• pp.395-401
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• 2015

A mini ball launch system was developed for the study of dynamic fracture of ceramic materials. The principle of velocity multiplication system is similar to two stage gun. The plastic sabot assembly houses steel plunger and the void filled with silicone rubber. The sabot is stopped by the stopper block then the steel plunger inside the sabot compress the silicone rubber to high pressure. Then the compressive energy of the silicone rubber is transferred to the ball. More than ten times of initial speed was attained. In this study, most effective silicone rubber for the highest final speed was chosen out of three different varieties by launch tests.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.434-438
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• 1996

In this paper we present the multi-agent robot system and the vision system developed for participating in micro robot soccer tournament. The multi-agent robot system consists of micro robot, a vision system, a host computer and a communication module. Micro robot are equipped with two mini DC motors witf encoders and gearboxes, a R/F receiver, a CPU and infrared sensors for obstacle detection. A vision system is used to recognize the position of the ball and opponent robots, position and orientation of our robots. The vision system is composed of a color CCD camera and a vision processing unit(AISI vision computer). The vision algorithm is based on morphological method. And it takes about 90 msec to detect ball and 3-our robots and 3-opponent robots with reasonable accuracy

• 마이크로전자및패키징학회지
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• 제2권1호
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• pp.59-68
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• 1995

박막제조 기술 및 BGA패캐지를 이용하여 Wellcom 2000 system 소요 OCU Board 의 집적화를 구현하였다. 기존 PCB에 실장되는 소자 일부를 2 Channel BGA 패캐지로 모 듈화한 결과 약 1/6로 소형화시킬수 있었으며 8 Channel의 모율화는 현재 진행중인 다층 구조의 제조 기술 개발과 아울러 BGA 패캐지로 실현이 가능하며 1/10로집접화할수 있음을 알수 있었다. 또한 PCB위에 Bare Chip을 실장하여 Wire Bonding 한 COB를 구현하여 CBGGA의 PCB실장과 함께한 모듈을 형성해 보았다. CBGA패캐지에 Ball Shear Test, In Circuit Test 온도 환경주기시험(TCT) 진동시험을 통하여 신뢰성을 입증하였다. 이때 CBGA의 Coplanarity(3.2%) 증진을 위하여 Ceramic Pad에 선택적인 도금 방식을 개발적용 하였다.

• 한국기계가공학회지
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• 제3권3호
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• pp.24-31
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• 2004

A successful on-line monitoring system for conventional machining operations has the potential to reduce cost, guarantee consistency of product quality, improve productivity and provide a safer environment for the operator. In fine-shape machining, typical signs of tool problems such as vibration, noise, chip flow characteristics and visual signs are almost unnoticeable without the use of special equipment. These characteristics increase the importance of automatic monitoring in fine-shape machining, however, sensing and interpretation of signals ar more complex. In addition, the shafts of the mini-tools break before the typical extensive cutting edge of the tool gets damaged. In this study, the existence of a relationship between the characteristics of the cutting force and tool usage was investigated, and tool breakage detection algorithm by LabVIEW was developed and the following results are obtained. It was possible to use a relative error compare which mainly used in established experiment and investigated tool breakage detection algorithm in time domain which can detect AE and cutting force signals more effective and accurate.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.507-510
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• 1996

In this paper we present the multi-agent robot system developed for participating in micro robot soccer tournament. The multi-agent robot system consists of micro robot, a vision system, a host computer and a communication module. Mcro robot are equipped with two mini DC motors with encoders and gearboxes, a R/F receiver, a CPU and infrared sensors for obstacle detection. A vision system is used to recognize the position of the ball and opponent robots, position and orientation of our robots. The vision system is composed of a color CCD camera and a vision processing unit. Host computer is a Pentium PC, and it receives information from the vision system, generates commands for each robot using a robot management algorithm and transmits commands to the robots by the R/F communication module. And in order to achieve a given mission in micro robot soccer game, cooperative behaviors by robots are essential. Cooperative work between individual agents is achieved by the command of host computer.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2002년도 정기학술대회
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• pp.123-129
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• 2002

본 논문에서는 Regulator IC의 불량원인 규명을 통해 반도체 고장분석 방법 및 개선사례를 소개하고자 한다. 고장분석에 사용된 반도체 Package는 8Pin MSOP(Mini Small Outline Package)로, 시장 불량품을 분석한 결과 Regulator IC의 Stitch Bond에 Heel Crack이 발생하여 불안정한 출력을 발생시킴을 알 수 있었다. Stitch Bond Heel Crack의 원인은 Lead Frame부의 박리(Delamination)에 의해 열이나 진동 등의 외부 Stress가 직접 Stitch Bond에 가해져 Crack이 발생된 것으로, Reflow 재현시험을 통해 확인 할 수 있었다. 박리 발생에 의한 Stitch Bond Heel Crack 방지 대책으로 첫째, Bonding Type을 Stitch Bond 에서 Ball Bond로 변경하여 강도를 개선하고 둘째, PCB Layout 변경을 통해 외력이 직접 Regulator IC에 가해지지 않도록 하였다. 개선 결과 현재까지 시장에서 동일 불량은 발생하지 않았다.

• 대한물리의학회지
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• 제13권4호
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• pp.59-65
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• 2018

PURPOSE: The purpose of the present study is to investigate the changes in the cognitive function of elderly dementia patients residing in a residential care facility, following six weeks of brain-computer interface (BCI)-based cognitive training and to determine whether BCI-based cognitive training effectively improves their cognitive functions. METHODS: Thirty subjects diagnosed with dementia were randomly assigned to either the experimental or control group. Pre- and post-test cognitive function assessments were conducted using the mini mental state examination-Korean (MMSE-K) and Korean-dementia rating scale (K-DRS). The experimental group received BCI-based cognitive training, which consisted of games such as flying a ball and exploding a bomb, while the control group participated in music listening activities and National Health Gymnastics. Both groups engaged in a total of 18 sessions (3 times per week for 6 weeks, for 40 minutes per session). RESULTS: After 6 weeks of intervention, the experimental group had significantly increased MMSE-K scores ($19.53{\pm}1.30$ to $22.20{\pm}1.15$; p<.0011) and total K-DRS scores ($87.20{\pm}4.16$ to $99.33{\pm}1.15$; p<.0011). In addition, the experimental group showed greater cognitive improvements than the control group. CONCLUSION: The results of this study suggest that BCI-based cognitive training is a positive intervention tool for improving the cognitive function of dementia patients.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제34권1호
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• pp.41-52
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• 2012

Purpose: Triangulation is the process of determining the location of a point by measuring angles to it from known points at either end of a fixed baseline. This point can be fixed as the third point of a triangle with one known side and two known angles. The aim of this study was to find a clinically adaptable method for applying an optical tracking navigation system to orthognathic surgery and to estimate its accuracy of measuring the bone displacement by use of triangulation methods. Methods: In orthognathic surgery, the head position is not fixed as in neurosurgery, so that a head tracker is needed to establish the reference point on the head surface byusing an optical tracking system. However, the operation field is interfered by its bulkiness that makes its clinical use difficult. To solve this problem, we designed a method using an Aquaplast splinting material and a mini-screw in applying a head tracker on a patient's forehead. After that, we estimated the accuracy of measuring displacements of the ball marker by an optical tracking system with a conventional head tracker (Group A) and with a newly designed head tracker (Group B). Measured values of ball markers' displacements by each optical tracking system were compared with values obtained from fusion CT images for an estimation of accuracy. Results: The accuracy of the optical tracking system with a conventional head tracker (Group A) is not suitable for clinical usage. Measured and predictable errors are larger than 10 mm. The optical tracking system with a newly designed head tracker (Group B) shows 1.59 mm, 6.34 mm, and 9.52 mm errorsin threeclinical cases. Conclusion: Most errors were brought on mainly from a lack of reproducibility of the head tracker position. The accuracy of the optical tracking system with a newly designed head tracker can be a useful method in further orthognathic navigation surgery even though the average error is higher than 2.0 mm.

• 콘크리트학회지
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• 제9권3호
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• pp.149-156
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• 1997

시멘트 모르타르의 압축강도 향상을 휘하여 분말혼화제를 제조하였으며,분말혼화재 사용에 따르는 유동성 감소를 억제하고자 고유동화제를 사용하였다. 분말혼화재(FAS)는 불산부생 II형 무수석고와 플라이애쉬 및 실리카흄을 혼합제조하여 시멘트 대신 각각10,20 wt% 씩 치환하였다. 물/고형분비(W/S)=0.40에서 FAS 로 치환된 시멘트 페이스트의 유동성은 저하되었고, 유동성 저하의 억제를 위한 고유동화제는 NSF와 NT-2가 효과적이었다. 시멘트 모르타르의 유동성은 II형 무수석고의 분말도가 미세할수록 증가하였고, 유동성저하는 FAS를 10 wt% 치환하였을 때 작게 나타났다. 압축강도는 10 wt%치환한 공시체가 20 wt%치환한 것보다 높게 나타났고 특히 $\gamma$ 를 10 wt%치환한 공시체( CI )에서 가장 높은 압축강도값을 나타내었다.