• 한국식생활문화학회지
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• 제27권6호
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• pp.677-685
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• 2012

This study examined the job satisfaction and characteristics of dietitians working in an elderly health care facility. The subjects for the study were 116 dietitians who work in an elderly health care facility across the country. The following lists the items affecting the total satisfaction on each element of the job: the nature of work (4.20), coworkers (4.02), supervision (3.83), communication (3.81), pay (3.22), operating conditions (3.16), fringe benefits (3.05) and promotion (2.78). Regarding supervision, regular employees (3.90) had higher satisfaction than non-regular employees (3.11), and for fringe benefits, regular employees (3.10) had higher satisfaction than non-regular employees (2.52). Regarding fringe benefits, those with less than 10 years experience showed higher satisfaction than with more than 10 years'. In terms of the job characteristics, the following were found to affect job satisfaction: the task identity (3.33), variety (3.27), autonomy (3.18), feedback (3.05), friendship opportunities (3.01) and dealing with others (2.82) were listed in the highest order. For task identity, more than 41 years old (3.53) had a significantly higher score. Regarding diversity, graduate schools (3.37) had a significantly higher score. In terms of income, those earning more than 2 million won (3.37 and 3.26) showed higher scores in autonomy and friendship opportunities than those earning less than 1.5 million won (2.79 and 2.57).

• 한국HCI학회논문지
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• 제14권2호
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• pp.83-91
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• 2019

최근에 서비스되는 모바일 게임들은 대부분 일일 퀘스트 시스템을 갖고 있다. 일일 퀘스트는 매일마다 반복적으로 수행할 수 있는 과제와 적절한 보상을 제공하여, 플레이어에게 게임의 플레이 방향을 알려주면서 접속을 유도할 수 있는 훌륭한 장치이다. 그러나 비슷한 과제의 반복적인 수행은 자칫하면 지루해질 수 있어 플레이어들의 동기부여를 고려한 일일 퀘스트에 대한 연구는 게임 경험 향상에 중요한 주제이다. 본 연구는 일일 퀘스트에 대한 학술적 논의가 매우 부족함에 대한 인식을 기반으로, 현재 서비스 중인 모바일 게임의 일일 퀘스트 유형을 정리하고, 플레이어의 성향에 따라 어떤 일일 퀘스트 유형을 선호하는지, 어떤 유형에서 동기를 더욱 향상시킬 수 있는 지를 분석하였다. 그 결과로 다음 세 가지를 도출해 내었다. 첫째, 일일 퀘스트를 클리어할 때마다 단계적으로 추가 보상을 제공하여 플레이어들의 동기를 향상시킬 수 있다. 둘째, 플레이 성향에 따라 선호하는 일일 퀘스트의 유형이 다를 수 있으며, 자율성을 중요하게 생각하는 플레이어들은 자신이 직접 퀘스트를 선택할 수 있는 기회를 통해 동기를 향상시킬 수 있다. 마지막으로, 숙련으로부터 더욱 동기 부여를 받는 성향의 플레이어들은 퀘스트를 모두 완료했다는 피드백으로 동기를 향상시킬 수 있다.

• 디지털융복합연구
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• 제19권6호
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• pp.47-52
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• 2021

본 연구에서는 직무특성의 핵심요소인 기술다양성, 과업정체성, 직무중요성, 자율성, 피드백에 초점을 맞춰 그 중요성을 강조하였다. 그리고 직무특성의 핵심요소들이 이직의도에 미치는 영향에서 자기효능감의 매개효과를 검증하는데 초점을 두었다. 이를 검증하기 위해 중국의 서비스업에 근무하는 종업원을 대상으로 설문조사를 실시하여 실증분석을 진행하였으며, 연구결과 직무특성의 하위요인들인 기술다양성, 과업정체성, 직무중요성, 자율성, 피드백은 모두 자기효능감을 향상시키는 것으로 밝혀졌다. 또한 자기효능감은 이직의도를 저하시키는 요소로 볼 수 있다는 것을 검증하였다. 더 나아가 자기효능감은 기술다양성, 자율성과 이직의도 간의 관계에서 완전 매개효과를 가진다는 것이 검증되었다. 이와 같은 연구결과들을 통해 직무특성의 하위요인 중에서 자기효능감에 가장 큰 영향을 미치는 요소가 무엇인지를 밝혔다. 마지막으로 본 연구결과를 바탕으로 중국 서비스업 기업과 중국에 진출하고자 하는 한국 서비스업 기업의 실무자에게 인적자원관리 측면에서 유용한 시사점을 제시하고 향후 관련 연구에 대해 논의하였다.

• 한국컴퓨터그래픽스학회논문지
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• 제30권3호
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• pp.87-97
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• 2024

본 연구는 PC 및 VR 디바이스를 이용하는 사용자가 리모트 환경에서 데이터 시각화를 협업 분석할 수 있는 시스템을 개발한다. 시스템에서는 사용자들이 시각화 분석의 프로세스 이해를 돕고 역할 분담을 효과적으로 할 수 있도록 업무 지향(task-oriented) 형식의 노드-링크 제어 인터페이스(node-link control interface)를 제공한다. 또한, 다수의 사용자가 물리적으로 공간이 분리되어도 협업을 진행하여 시각화 분석의 피드백을 받을 수 있는 네트워크 환경을 제공한다. 시스템에서 진행하는 협업 분석 방식을 설명하기 위해 시나리오를 설계하였다. 그리고 관련분야 전공자를 대상으로 시스템의 사용성을 측정하는 파일럿 실험을 진행하였다. 실험 결과 확장현실 공간에서 이해하기 쉬운 형식의 인터페이스 조작을 통해 데이터를 자유롭게 분석할 수 있고, 리모트 환경에서도 실시간으로 협업 분석을 수월하게 진행할 수 있음을 확인하였다.

• 한국산학기술학회논문지
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• 제19권1호
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• pp.179-187
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• 2018

본 연구는 운동선수의 지도행동유형이 선수만족 및 운동몰입과의 관계를 규명하여 선수의 능력을 향상시켜서 경기력을 높이는데 목적이 있다. 표집방법으로 비확률표본추출법을 이용하였고, 설문지의 총 381부를 자료 분석에 사용하였다. 설문지는 SPSS/PC+ Window용 21.0 version 통계프로그램을 이용하여, 연구 대상자의 빈도 분석과 요인분석, 상관관계 분석, 다중회귀분석을 실시하였다. 본 연구의 결과는 첫째, 운동선수의 지도행동유형인 훈련과 지도행동, 민주적 행동, 긍정적 피드백, 사회적지지에서 선수만족 및 운동몰입에서 상호관련성은 정적(+)인 상관관계가 나타났으며, 지도행동유형의 권위적 행동에서는 운동몰입에 상관관계가 나타나지 않았다. 둘째, 운동선수의 지도행동유형이 선수만족에 대한 결과는 사회적 상호작용은 훈련과 지도, 사회적 지지에서, 과제 수행은 훈련과 지도에서, 코치의 지도성은 훈련과 지도, 긍정적피드백에서 정적인 영향을 미치는 것으로 나타났다. 셋째, 운동선수의 지도행동유형이 운동몰입에 대한 결과는 인지몰입은 훈련과 지도, 긍정적 피드백에서, 행위몰입은 훈련과 지도, 긍정적 피드백, 사회적 지지에서 정적인 영향을 미치는 것으로 나타났다. 따라서 선수들의 운동수행만족과 운동에 몰입하여 경기에 임하게 된다면 좋은 운동기술수행을 통하여 최상의 경기력을 발휘할 수 있을 것이다.

• 대한의용생체공학회:의공학회지
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• 제44권6호
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• pp.363-376
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• 2023

According to the COVID-19, development of various medical software based on IoT(Internet of Things) was accelerated. Especially, interest in a central software system that can remotely monitor and control ventilators is increasing to solve problems related to the continuous increase in severe COVID-19 patients. Since medical device software is closely related to human life, this study aims to develop central monitoring system that can remotely monitor and control multiple ventilators in compliance with medical device software development standards and to verify performance of system. In addition, to ensure the safety and reliability of this central monitoring system, this study also specifies risk management requirements that can identify hazardous situations and evaluate potential hazards and confirms the implementation of cybersecurity to protect against potential cyber threats, which can have serious consequences for patient safety. As a result, we obtained medical device software manufacturing certificates from MFDS(Ministry of Food and Drug Safety) through technical documents about performance verification, risk management and cybersecurity application.The purpose of this study is to conduct a usability assessment to ensure that ergonomic design has been applied so that the ventilator central monitoring system can improve user satisfaction, efficiency, and safety. The rapid spread of COVID-19, which began in 2019, caused significant damage global medical system. In this situation, the need for a system to monitor multiple patients with ventilators was highlighted as a solution for various problems. Since medical device software is closely related to human life, ensuring their safety and satisfaction is important before their actual deployment in the field. In this study, a total of 21 participants consisting of respiratory staffs conducted usability test according to the use scenarios in the simulated use environment. Nine use scenarios were conducted to derive an average task success rate and opinions on user interface were collected through five-point Likert scale satisfaction evaluation and questionnaire. Participants conducted a total of nine use scenario tasks with an average success rate of 93% and five-point Likert scale satisfaction survey showed a high satisfaction result of 4.7 points on average. Users evaluated that the device would be useful for effectively managing multiple patients with ventilators. However, improvements are required for interfaces associated with task that do not exceed the threshold for task success rate. In addition, even medical devices with sufficient safety and efficiency cannot guarantee absolute safety, so it is suggested to continuously evaluate user feedback even after introducing them to the actual site.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.1742-1745
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• 1997

We have developed a highly responsible probing system for inspection of electrical properties of assemble PCB$_{s}$ (printed circuit boards). However, as the duration of the impact occurring between a probe and a solder joint on PCB is very short, it is very difficult to control the harmful peak impact force and the slip motion of the probe to sufficient level only by its vorce feedback control with high gains. To overcome these disadvantages of the prototype, it needs ot obtain some information of the solder joint in advance before the contact. In addition, to guarantee the reliability of the probing task, the probing system is required to measure several points around the probale target point at high speed. There fore, to meet such requirements, we propose a new noncontaet sensor capable of detecting simultaneously position and normal vectors of the multiple points around the probable target point in real time. By using this information, we can prepare a control strategy for stable contact motion on impact. In this paper, we described measuring priniciple, design, and development of the sensor. The effectiveness of the proposed sensor is verified through a series of experiments.s.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1786-1790
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• 2004

The main objective of this paper is to analyze the performance of various force control algorithms in improving and adjusting the compliance of industrial robots in contact with their environment. Some of fundamental force control algorithms such as sensorless control, impedance control and hybrid position/force control are theoretically analyzed and simulated for various situations of an environment, and then a series of experiments using them were performed. In this paper, a control scheme to use position control in implementing the impedance control was investigated in order to nullify the effect of joint friction. The new reference trajectory is generated using contact force feedback and original desired trajectory. And an inner position control loop is designed to provide accurate position tracking for the new reference trajectory and good disturbance rejection. Experiments to insert a peg in a hole (so-called the peg-in-a-hole task) were performed with HILS (hardware-in-theloop simulation) system based on the results of the analyses and simulations on the characteristics of each control algorithm. The experiments showed that various force control methods improved the performance of robots in close contact with the environment by adjusting their compliance with respect to an arbitrary set of coordinates.

• 한국정밀공학회지
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• 제16권1호통권94호
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• pp.211-218
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• 1999

The traditional robot manipulators are actuated by continuous range of motion actuators such as motors or hydraulic cylinders. However, there are many applications of mechanisms and robotic manipulators where only a finite number of locations need to be reached, and the robot’s trajectory is not important as long as it is bounded. Binary manipulator uses actuators which have only two stable states. As a result, binary manipulators have a finite number of states. The number of states of a binary manipulator grows exponentially with the number of actuators. This kind of robot manipulator has some advantage compared to a traditional one. Feedback control is not required, task repeatability can be very high, and finite state actuators are generally inexpensive. And this kind of robot manipulator has a fault tolerant mechanism because of kinematic redundancy. In this paper, we solve the inverse kinematic problem of a binary parallel robot manipulator using neural network and test the validity of this structure using some arbitrary points m the workspace of the robot manipulator. As a result, we can show that the neural network can find the nearest feasible points and corresponding binary states of the joints of the robot manipulator

• Smart Structures and Systems
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• 제11권3호
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• pp.315-329
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• 2013

The construction of an experimental nonlinear structural model with little cost and unlimited repeatability for vibration control study represents a challenging task, especially for material nonlinearity. This paper reports the design, analysis and vibration control of a nonlinear structural experiment platform with adjustable hinges. In our approach, magnetorheological rotary brakes are substituted for the joints of a frame structure to simulate the nonlinear material behaviors of plastic hinges. For vibration control, a separate magnetorheological damper was employed to provide semi-active damping force to the nonlinear structure. A dynamic neural network was designed as a state observer to enable the feedback based semi-active vibration control. Based on the dynamic neural network observer, an adaptive fuzzy sliding mode based output control was developed for the magnetorheological damper to suppress the vibrations of the structure. The performance of the intelligent control algorithm was studied by subjecting the structure to shake table experiments. Experimental results show that the magnetorheological rotary brake can simulate the nonlinearity of the structural model with good repeatability. Moreover, different nonlinear behaviors can be achieved by controlling the input voltage of magnetorheological rotary damper. Different levels of nonlinearity in the vibration response of the structure can be achieved with the above adaptive fuzzy sliding mode control algorithm using a dynamic neural network observer.