• 한국산업융합학회 논문집
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• 제21권2호
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• pp.95-101
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• 2018

This paper presents a collision free mobile robot navigation based on the fuzzy inference fusion model in unkonown environments using multi-ultrasonic sensor. Six ultrasonic sensors are used for the collision avoidance approach where CCD camera sensors is used for the trajectory following approach. The fuzzy system is composed of three inputs which are the six distance sensors and the camera, two outputs which are the left and right velocities of the mobile robot's wheels, and three cost functions for the robot's movement, direction, obstacle avoidance, and rotation. For the evaluation of the proposed algorithm, we performed real experiments with mobile robot with ultrasonic sensors. The results show that the proposed algorithm is apt to identify obstacles in unknown environments to guide the robot to the goal location safely.

• 디지털융복합연구
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• 제9권1호
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• pp.115-124
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• 2011

The property of the mobile phone is taking important role to choose it. In the present situation, exploring, comparing and analyzing the important properties of regular mobile phone(feature phone) and smart phone are very meaningful study. Therefore, the survey was carried out to get the properties of feature phone and smart phone and analyze the difference of those phones. And proposed the important variables for customer satisfaction which must be given priority. The result showed that 'design' and 'Quality' are important to both mobile phone user groups. The problems with mobile phones currently in use were 'poor performance' to feature phone users and 'expensive charge' and 'poor A/S' to smart phone users. Two groups also showed significant difference with the customer satisfactions, and smart phone user group showed higher satisfaction. For smart phone user group, four factors are induced from the properties but 'Hardware Quality' (representing 'call Quality', 'A/S', 'Convenience to use', 'Battery life') and 'Design & Function'(representing 'Internet', 'Convergence Functions', 'Design, 'Color') have significant and positive effects on Customer Satisfaction.

• 융합보안논문지
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• 제9권4호
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• pp.29-34
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• 2009

이동 애드혹 네트워크 환경에서 신뢰할 수 없는 서비스들로 인해 과도한 트랜잭션이 발생되고 있다. 본 논문은 이러한 문제점을 극복하기 위한 방안으로, 이동 애드혹 네트워크 내에서 발생하는 기본적인 트랜잭션 메시지와 추가적인 트랜잭션 메시지에 의미를 부여하여 보다 나은 서비스를 제공하는 노드 선택의 기준이 될 수 있는 신뢰도 평가 기법을 제안한다. 제안한 신뢰도 기법을 구현하고 시뮬레이션을 통해서 평가된 신뢰도 값을 확인한다.

• 한국산업융합학회 논문집
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• 제20권2호
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• pp.89-95
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• 2017

In this paper, we suggest the method for a mobile robot to move safely from an initial position to a goal position in the wide environment like a building. There is a problem using odometry encoder sensor to estimate the position of a mobile robot in the wide environment like a building. Because of the phenomenon of wheel's slipping, a encoder sensor has the accumulated error of a sensor measurement as time. Therefore the error must be compensated with using other sensor. A vision sensor is used to compensate the position of a mobile robot as using the regularly attached light's panel on a building's ceiling. The method to create global path planning for a mobile robot model a building's map as a graph data type. Consequently, we can apply floyd's shortest path algorithm to find the path planning. The effectiveness of the method is verified through simulations and experiments.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2012년도 추계학술발표대회
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• pp.1140-1142
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• 2012

본 연구는 스마트폰으로 조명등을 원격에서 제어하기 위한 Mobile 조명제어시스템(LMS)에 관한 것으로 특히 조명제어서버 내에 제어기와 Database를 직접 동기화시키는 Thread Pool 방식을 사용하여 별도의 에이전트 프로그램의 탑재 없이도 스마트폰에서 직접 데이터베이스에 접속하여 제어되게 함으로써 스마트폰 내에서 이루어지는 작업을 최소화 하고 결과적으로 스마트폰 뿐만 아니라 BEMS, FEMS, BAS와 같은 외부 장비와의 연계운영이 용이하며 Mobile 프로그램의 개발 및 운영환경을 제공할 수 있는 Mobile 조명제어장치의 연구 내용을 소개하고 있다.

• 한국산업융합학회 논문집
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• 제24권3호
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• pp.301-306
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• 2021

In this paper, we propose a modified back-stepping control method in view of the dynamic model of mobile manipulator has the nonholonomic constraints, these constraints should be considered to design a tracking controller for the mobile manipulator. The conventional back-stepping controller includes the dynamics and kinematics of the mobile robot systems. and the modified adaptive back0stepping method is applied to constructing the controller. The proposed controller can realize the tracking trajectory of the reference path. The efficiency and robustness of this control method is demonstrated by the simulation.

• 한국산업융합학회 논문집
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• 제25권5호
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• pp.869-880
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• 2022

This study was conducted on 54 freshmen of the department of dental technology in D University to examine the effect of dental morphological practice mobile application utilization on the students' perception of class and satisfaction with learning. Major results of the study showed that satisfaction and utility towards functions of mobile application strengthened positive perception of dental morphology class, leading to improvement of satisfaction with learning, which suggested that functional convenience and utility in the use of applications were the effective factors for increasing the satisfaction with learning. Those results need to be given important consideration in designing the class using the mobile applications.

• 한국산업융합학회 논문집
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• 제26권2_1호
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• pp.225-230
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• 2023

This research addresses sound command based human tracking problems for autonomous cleaning mobile robot in a networked AI space. To solve the problem, the difference among the traveling times of the sound command to each of three microphones has been used to calculate the distance and orientation of the sound from the cleaning mobile robot, which carries the microphone array. The cross-correlation between two signals has been applied for detecting the time difference between two signals, which provides reliable and precise value of the time difference compared to the conventional methods. To generate the tracking direction to the sound command, fuzzy rules are applied and the results are used to control the cleaning mobile robot in a real-time. Finally the experiment results show that the proposed algorithm works well, even though the mobile robot knows little about the environment.

• 대한인간공학회지
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• 제30권5호
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• pp.651-657
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• 2011

Objective: The aim of this study is to investigate the system to integrate and manage the in-vehicle interactions between the drivers and the in-vehicle mobile IT devices. Background: As the mobile IT technology is being used anywhere, the drivers are interacting with the mobile IT device on driving situations. The distraction of the driver's attention causes the car accidents. It is necessary to develop the HVI(Human Vehicle Interface System) to integrate and manage the in-vehicle interactions with IT devices. Method: The HVI System is designed not as the interfacing subject but as the supervising system to monitor the driver's status and support the driver to concentrate on the primary tasks. The HVI system collects the status information of the car and driver and estimate the driving workload. Results: The HVI system controls how to provide the output information based on the driving workload. We implemented the HVI system prototype and applied in the real vehicle with the HVI cell phone and the HVI car navigation system. Conclusion: Depending on the driving situations, the HVI system prevented the information output in dangerous situation and diversified the modality and the intensity of the output information. Application: We will extend the HVI system to be connected the other various IT devices and verity the effectiveness of the system through various experiments.

• 한국융합학회논문지
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• 제3권4호
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• pp.7-13
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• 2012

모바일 인스턴트 메신저 50~60년대 TV나 20세기 초 전화만큼이나 우리의 삶을 변화시키고 있다. 따라서 많은 학자들은 모바일 인스턴트 메신저가 우리의 공동체 생활과 사회적 관계에서의 참여를 향상시키는지 아니면 해를 입히고 있는지에 대해 궁금증을 제시하고 있다. 이를 위해 본 연구에서는 2개 대학의 155명의 참여자를 대상으로 자신이 소유한 모바일 인스턴트 메신저가 외로움에 미치는 영향을 탐색해보고자 하였다. 연구결과, 높은 모바일 인스턴트 메신저 사용은 타인과의 의사소통을 감소시키고 결국 외로움을 증가시키는 것으로 나타났다.