• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.594-597
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• 1995

A hand controller in teleoperation is a man-machine interface device that provides real-time interaction between a human operator at control site and a slave manipulator at remote site. In this paper, we examine the design issure related to various types of hand controllers in use. Emphasis is placed on bilateral hand controllers and their design parameters. We describe the design of a new 6 degree-of-freedom universal force-reflecting hand controller to control a remote Schilling Titan manipulator. This hand controller allows the operstor to maintain spatial corresponence in remote manipulative operation and fell a sense of contact with the environment. Finally, we demonstrate the graphic simulation of the hand controller to verify its design characteristics.

• 전자공학회논문지
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• 제50권12호
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• pp.129-137
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• 2013

최근 다양한 컴퓨터기반 장치들의 사용 확대에 따라 장애인에게도 정보접근의 용이성 확보가 요구되고 있다. 특히 사지를 움직일 수 없는 중증 장애인들을 위한 새로운 입력 인터페이스 기술의 개발이 절실히 요구된다. 이를 위해 본 논문에서는 중증 장애인이 활용 가능한 눈동자 움직임 및 깨물기를 통한 안전도(EOG)와 근전도(EMG)신호를 이용하여 아홉 가지의 명령이 가능한 인터페이스 시스템을 개발하였다. 구현된 시스템은 하드웨어로 구성된 센서모듈과 특징추출 및 패턴분류를 포함하는 소프트웨어부로 구성된다. 개발된 기술은 사용자의 편의성을 극대화하기 위해 두 개의 전극만을 이마부위에 부착하여 안전도와 근전도를 동시에 측정하고, 이를 통해 아홉 가지의 명령전달이 가능하도록 하였다. 성능평가를 위한 java 기반 실시간 모니터링 프로그램의 실험결과 92.52%의 인식률을 보였다. 또한, 구현된 시스템의 실용성을 입증하기 위해 다섯 종류의 명령을 이용하여 ER1 로봇의 조종에 성공적으로 적용 가능함을 보임으로써 장애인을 위한 새로운 인터페이스로서의 가능성을 보였다.

• 제어로봇시스템학회논문지
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• 제12권9호
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• pp.926-934
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• 2006

This paper proposes intelligent control of a virtual walking machine that can generate infinite floor for various surfaces and can provide proprioceptive feedback of walking to a user. This machine allows users to participate in a life-like walking experience in virtual environments with various terrains. The controller of the machine is implemented hierarchically, at low-level for robust actuator control, at mid-level fur platform control to compensate the external forces by foot contact, and at high-level control for generating walking trajectory. The high level controller is suggested to generate continuous walking on an infinite floor for various terrains. For the high level control, each independent platform follows a man foot during the swing phase, while the other platform moves back during single stance phase. During double limb support, two platforms manipulate neutral positions to compensate the offset errors generated by velocity changes. This control can, therefore, satisfy natural walking conditions in any direction. Transition phase between the swing and the stance phases is detected by using simple switch sensor system, while human foot motions are sensed by careful calibration with a magnetic motion tracker attached to the shoe. Experimental results of walking simulations at level ground, slope, and stairs, show that with the proposed machine, a general person can walk naturally on various terrains with safety and without any considerable disturbances. This interface can be applied to various areas such as VR navigations, rehabilitation, and gait analysis.

• Tribology and Lubricants
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• 제25권1호
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• pp.56-60
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• 2009

A journal bearing is used in a hydrodynamic lubrication state, but it becomes a boundary lubrication state that asperity of a contact part touch each other when pressure is too high and an enough oil film is not formed by viscosity change due to lubricating oil temperature. At this time, abrasion due to contact between a journal and a bearing is unavoidable, and scuffing damage that the journal adheres to the bearing occurs if the process is repeated. Damage of the journal bearing is an important problem because it gives huge damage to a machine and can generate large accidents such as economic loss and human life damage. In this study, method for using the pull-up resistor concept was introduced as the monitoring technology. This monitoring system is important to enhance reliability of the engine.

• 한국융합학회논문지
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• 제11권4호
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• pp.17-25
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• 2020

본 연구는 식당에서 사용하는 외식서빙 로봇의 서비스 절차 및 인터랙션 방식에 중점을 두고 연구한다. 사용자 설문조사,사용자를 관찰하고 고객과 레스토랑 종업원의 인터뷰를 통한 레스토랑 서빙 로봇과 고객의 교류방식을 분석하고 사용자 요구를 파악하기 위해 사용자 여정 지도를 구축한다. 또한 서비스 절차에서 배달 서비스 뿐만 아니라 주문 서비스, 접대 서비스 및 테이블 정리 등을 모두 서비스 로봇이 행하는 것을 의도한다.최종 제안 연구 목적은 기존의 서빙 로봇 GUI을 개선하고 새로운 서비스 청사진을 설계하는 것이다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권4호
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• pp.1209-1223
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• 2022

Blood pressure is one of the key physiological parameters for determining human health, and can prove whether human cardiovascular function is healthy or not. In general, what we call blood pressure refers to arterial blood pressure. Blood pressure fluctuates greatly and, due to the influence of various factors, even varies with each heartbeat. Therefore, achievement of continuous blood pressure measurement is particularly important for more accurate diagnosis. It is difficult to achieve long-term continuous blood pressure monitoring with traditional measurement methods due to the continuous wear of measuring instruments. On the other hand, radar technology is not easily affected by environmental factors and is capable of strong penetration. In this study, by using machine learning, tried to develop a linear blood pressure prediction model using data from a public database. The radar sensor evaluates the measured object, obtains the pulse waveform data, calculates the pulse transmission time, and obtains the blood pressure data through linear model regression analysis. Confirm its availability to facilitate follow-up research, such as integrating other sensors, collecting temperature, heartbeat, respiratory pulse and other data, and seeking medical treatment in time in case of abnormalities.

• 한국융합학회논문지
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• 제8권10호
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• pp.167-172
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• 2017

본 연구는 그동안 탁월한 치유의 기능이 내재되어 있다고 알려진 시조의 감정 코드들을 분석하여 인문학적 치유의 콘텐츠를 활성화시키고자 하는 데에 목적이 있다. 치유작용의 일환으로써의 시조는 여러 작품들을 감상하는 과정에서 형성되는 감정의 융합을 통해 감정의 총체라 할 수 있는 치유의 감정 코드들을 형성한다. 이러한 과정은 인체생리학적으로 인체 내에서의 문학치료의 진행을 가능하게 한다. 머신러닝이 인지기능에 의해 스스로 학습하는 것처럼 상시적으로 부호화와 재부호화에 대한 코딩 과정이 인체 시스템의 수많은 뉴런들의 집합체들에서 작동된다. 그 과정에서 감정 코드들의 집합적인 부호화에 의해 인체 내에서 아미노산이 합성되는 것으로 예측된다. 이러한 아미노산들이 인체의 신호 체계를 조절하는 것이다. 향후 이러한 인문학과 인체생리학의 접점에서의 치료의 연구가 진행된다면 보다 질 높은 인문학적 치유의 프로그램이 활성화될 것으로 기대된다.

• The Journal of Advanced Prosthodontics
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• 제4권3호
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• pp.139-145
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• 2012

PURPOSE. To evaluate the shear bond strength of resin luting agent to dentin surfaces cleansed with different agents like pumice, ultrasonic scaler with chlorhexidine gluconate, EDTA and the influence of these cleansing methods on wetting properties of the dentin by Axisymmetric drop Shape Analysis - Contact Diameter technique (ADSA-CD). MATERIALS AND METHODS. Forty coronal portions of human third molar were prepared until dentin was exposed. Specimens were divided into two groups: Group A and Group B. Provisional restorations made with autopolymerizing resin were luted to dentin surface with zinc oxide eugenol in Group A and with freegenol cement in Group B. All specimens were stored in distilled water at room temperature for 24 hrs and provisional cements were mechanically removed with explorer and rinsed with water and cleansed using various methods (Control-air-water spray, Pumice prophylaxis, Ultrasonic scaler with 0.2% Chlorhexidine gluconate, 17% EDTA). Contact angle measurements were performed to assess wettability of various cleansing agents using the ADSA-CD technique. Bond strength of a resin luting agent bonded to the cleansed surface was assessed using Instron testing machine and the mode of failure noted. SEM was done to assess the surface cleanliness. Data were statistically analyzed by one-way analysis of variance with Tukey HSD tests (${\alpha}$=.05). RESULTS. Specimens treated with EDTA showed the highest shear bond strength and the lowest contact angle for both groups. SEM showed that EDTA was the most effective solution to remove the smear layer. Also, mode of failure seen was predominantly cohesive for both EDTA and pumice prophylaxis. CONCLUSION. EDTA was the most effective dentin cleansing agent among the compared groups.

• Restorative Dentistry and Endodontics
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• 제17권2호
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• pp.355-364
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• 1992

This is a study on the effect of the dentinal pretreatment method to the bond strength between dentin and glass ionomer cement. In this study, 196 human molar teeth with sound crown were used. The dentin surfaces of these teeth were exposed with wet trimmer and polished with # 800 Emory paper and teeth were divided into 7 groups according to the pretreatment agent and method. Each group has 4 subroups of the kinds of glass ionomers. The shear bond strength were measured by Instron Universal Testing machine model 1122. The data of the evaluations were then subjected to statistical analysis using one way ANOVA and the result were as follows : 1. In Durelon liquid 20 sec scrubbing & Vitrebond filling subgroup, shear bond strength was highest with measurements of 72.41(kg/$cm^2$) and in no pretreatment & Shofu lining cement filling subgroup, lowest with measurements of 4.77(kg/$cm^2$). 2. In no pretreatment group, statistical significant differences were found between the subgroups of G-C lining cement and Shofu lining cement. 3. In Ketac conditioner 20 sec scrubbing group, Vitrebond were bonded stronger than others, and in Ketac conditioner 10 sec passive contact group, it has the significant difference with other glass ionomers except G-C lining cement. 4. The subgroup og G-C dentin conditioner 20 sec scrubbing & G-C lining cement filling was bonded to dentin stronger than the subgroup of no pretreatment & Shofu lining cement. In G-C dentin conditioner groups, both of 10 sec passive contact and 20 sec scrubbing, Vitrebond has highest bond strength among the subgroups. 5. The subgroup of Durelon liquid 10 sec passive contact & G-C lining cement filling was bonded to dentin stronger than the subgroup of no pretreatment & Shofu lining cement. Also in both Durelon liquid groups, Vitrebond were bonded to dentin with the highest strength among the subgroups.

• 농업과학연구
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• 제43권4호
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• pp.650-655
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• 2016

Gears are components of transmission which transmit the power of an engine to a machine and offer numerous speed ratios, a compact structure, and high efficiency of power transmission. Gear train design in the automotive industry uses simulation software. However, PTO (Power Take-Off) gear design for agricultural applications uses the empirical method because of the wide range of load fluctuations in agricultural fields. The PTO is an important part of agricultural tractors which transmits the power to various tractor implements. Therefore, a simulation was essential to the optimal design of the PTO. When the PTO gear is optimally designed, there are many advantages such as low cost, reduced size, and light weight. In this study, we conducted the bending and contact safety factor simulation for the PTO gear of an agricultural tractor. The bending and contact safety factors were calculated on ISO 6336 : 2006 by decreasing the face widths of the PTO pinion and wheel gear from 18 mm at an interval of 1 mm. The safety factor of the PTO gear decreased as the face width decreased. The contact safety factors of the pinion and wheel gear were 1.45 and 1.53, respectively, when the face width was 18 mm. The simulation results showed that the face width of the PTO gear should be greater than 9 mm to maintain the bending and contact safety factors higher than 1. It would be possible to reduce the weight of the PTO gear for different uses and working conditions. This study suggests that the possibility of designing an optimal PTO gear decreases as its face width decreases.