• Title/Summary/Keyword: communication status

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Centralized, Distributed, Hybrid Task Planning Framework for Multi-Robot System in Diverse Communication Status

  • Moon, Jiyoun
    • Journal of Positioning, Navigation, and Timing
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    • v.10 no.3
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    • pp.215-220
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    • 2021
  • As the role of robots expands, flexible task planning methods are attracting attention from various domains. Many task planning frameworks are introduced to efficiently work in a wide range of areas. In order to work well in a broad region with multiple robots, various communication conditions should be controlled by task planning frameworks. However, few methods are proposed. In this paper, we propose mission planning methods according to the communication status of robots. The proposed method was verified through experiments assuming different communication states with a multi-robot system.

Communication Status in Group and Semantic Network of Science Gifted Students in Small Group Activity (소집단 활동에서 과학 영재들의 집단 내 의사소통 지위와 언어네트워크)

  • Chung, Duk Ho;Cho, Kyu Seong;Yoo, Dae Young
    • Journal of the Korean earth science society
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    • v.34 no.2
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    • pp.148-161
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    • 2013
  • The purpose of the study was to investigate the relationship between the communication status in group and the semantic network of science gifted students. Seven small groups, 5 members in each, participated in small group activities, in which they discussed the calculation of earth density. Both the communication status in group and the semantic network of science gifted students were analyzed using KrKwic, Ucinet 6.0 for Windows. As a result, the semantic network of prime movers in group represented more frequently used words, lesser rate of component, and higher density than that of out lookers. It means that the prime movers have coherent knowledge compared to out lookers, and they output more knowledge for problem solving than out lookers. Therefore, the results of this study may be applied to evaluating the cognitive level of science gifted students and group organization for small group activity.

FMS Control and Monitoring using Petri Net (Petri-Net 을 이용한 FMS 제어 및 모니터링)

  • Kim, Go-Joong;Jung, Moo-Young;Jo, Hyeon-Bo
    • Journal of Korean Institute of Industrial Engineers
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    • v.21 no.1
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    • pp.137-151
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    • 1995
  • A difficult problem in operating Flexible Manufacturing Systems (FMS) is to control the system in real-time by coordinating heterogeneous machines and integrating distributed information. The objective of the paper is to present the models and methodologies useful to resolve the difficult problem. The detailed objectives can be described in three folds. First, a hierarchical Colored and Timed Petri-Net (CTPN) is designed to control an FMS in real-time. The concerned FMS consists of a loading station, several machining cells, a material handling system, and an unloading station. Timed-transitions are used to represent the timed-events such as AGV movements between stations and cells, part machining activities in the cells. Signal places are also used to represent communication status between the host and the cell controllers. To resolve the event conflicts and scheduling problems, dispatching rules are introduced and applied. Second, an implementation methodology used to monitor and diagnose the errors occurring on the machines during system operation is proposed. Third, a Petri-Net simulator is developed to experiment with the designed control logic.

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A Study on Decision-Making between Husbands and Wives (I) - focusing on the Farming of Fishing Villages in Jeju Island - (부부간의 의사결정에 관한 연구 (I) - 제주도 농.어촌 가정을 중심으로 -)

  • 김혜숙
    • Journal of the Korean Home Economics Association
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    • v.20 no.3
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    • pp.65-83
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    • 1982
  • In this paper, the writer makes attempts to investigate what kinds of decision-making patterns are adopted, when husbands and wives make up their minds about home managerial problems of farming or fishing villages in Jeju Island. The data in this study were drawn through the questionaire collected from 299 families of farming of fishing villages in Jeju Island. Percentage and F-test applied to statistical analysis. The results are found as follows: 1. Although husbands and wives do joint decision making with each other, some decision making spheres are classified according to problems. 2. Family types are mainly made up of Autonomic family and syncratic family, but there are comparatively by far syncratic family in Jeju Island than any other area. 3. The background variables to be influenced upon are their ages, educational level, duration of marriage, the number of whole family, the number of daughters, the number of children, managing power of their living expenses, satisfaction of their conjugal lives, daily communication status, quarrels between them, locations of farming or fishing villages, etc.

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Relationship between Information Security Education and Information Protection Practice of Hospital (의료기관의 정보보호교육과 정보보안생활과의 관련성)

  • Kim, Jongdeok;Hong, Hwayong;Kim, Jae-Hyun
    • Korea Journal of Hospital Management
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    • v.24 no.2
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    • pp.56-66
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    • 2019
  • PURPOSE: To demonstrate that the training of information protection for members at medical institutions increases the information protection activities of employees. METHODS: We used the chi-square test and the logistic regression model to analyze the data of the "Healthcare Information and Communication Status Survey in 2017" (n = 2002) conducted by the Korea Health Industry Development Institute RESULTS: As a result of the analysis, the information protection activity increased when the education was received and the number of received more than the education was not received. Especially, when the management receives education, it affects the information protection activities of the employees. CONCLUSION: In order to protect medical information, medical institutions need to provide education on information protection for management and employees.

The Differences of Verbal Interactions according to Communication Structures and Communication Status in Small Group Activity of Earth Science Gifted Students (지구과학 영재들의 소집단 활동에서 의사소통 구조와 집단 내 지위에 따른 언어적 상호 작용의 차이)

  • Chung, Duk Ho;Lee, Chul Min;Park, Kyeong-Jin
    • Journal of the Korean earth science society
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    • v.41 no.3
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    • pp.307-319
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    • 2020
  • The purpose of this study was to determine whether there are differences in the verbal interactions of earth science gifted depending on their communications structures and group status in small group activities. To this end, a small group activity was conducted to measure the density of the earth, and 8 small groups were selected, including 4 co-ownership type and 4 monopolistics type groups with different communication structures. And then, the framework was developed for analyzing verbal interactions to compare the differences in characteristics between small groups. The results are as follows. First, regardless of the communication structures, there were showing a simple pingpong-type communication structures for all small groups. Second, negative interactions such as 'restraint', 'command', 'complaint', and 'lack of confidence' predominantly appeared in all small groups. Third, the students in the status of out-lookers in small groups were mainly verbal interactions, such as instructing the other person, acting against the other person's actions, and expressing dissatisfaction with the attitudes and abilities of members. Therefore, teachers should guide students to use higher-level verbal interactions in their group activities in small group activities, and engage in students communication to prevent negative interactions from occurring. The teachers also need to check the level of achievement for students in the status of out-lookers in advance and guide them to participate more actively in small group activities. This study is meaningful in that it can be sued to design teaching and learning to improve students' problem solving and communication skills.

Exploring Differing Communication among Generation in a Social Network Age (소셜 네트워크 시대의 세대 간 소통 증감 인식차이에 대한 탐색적 연구)

  • Park, Kiho
    • Journal of Information Technology Applications and Management
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    • v.24 no.1
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    • pp.11-24
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    • 2017
  • Due to development of smart and network technologies, social network service (SNS) has become popular in daily life. With increasing use of SNS, the scope of communication has been widened. Lots of activities can be easily shared daily on SNS. Differing with opinions about more activated communication on SNSs, some people have viewpoints that, in some cases, communications may be decreased among SNS users. This research is to investigate whether there may be the differences among generations in the social network age. Major concerns of study are as follows. First, there may be differences in age related to the decrease of communication activities. On the other hand, there may be differences among generations related to the increase of communication. Two research steps have been adopted that the FGI (focus group interview) was to understand. Defining actual communication status was the first step, and an empirical approach, a survey to verify hypotheses, was performed as the second step. Key findings of the study were that older generations perceived communication has been decreased. Research results can provide implications regarding characteristics of SNS communication.

Development of Communication Device for Sound Signal Receiving and Controlling of Sonobuoy (소노부이의 음향신호 수신 및 제어를 위한 통신장치 개발)

  • Lee, Jaeeun;Han, Sangkyu;Kwon, Bumsoo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.24 no.3
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    • pp.317-327
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    • 2021
  • Low Frequency Active Sonobuoy(hereinafter referred to as LFAS) are being developed in Korea in consideration of compatibility with existing overseas sonobuoys, and a communication device for acoustic signals receiving and operating control of LFAS has been developed. The communication device needs to verify compatibility with the existing Sonobuoy, and for this purpose, the standardized Sonobuoy communication protocol was applied. The communication device is designed/manufactured to transmit the acoustic signal received in real time from the Sonobuoy through VHF band RF communication to the data processing device, and transmit CFS/CSG commands for operation control to the Sonobuoy through UHF band RF communication. In order to verify the manufactured communication device, the communication status and performance were verified by interlocking test through Ultra Electronics' PASS-II equipment and domestically developed electronic device of Sonobuoy. In addition, operability was verified through environmental tests, water tanks, and marine operations. In the future, the communication device of sonobuoy can be used for verification of the Sonobuoy developed in Korea.

A Survey on Qualitative Analysis of Directional VANET MAC Protocols

  • Kim, Bongjae;Cho, Kwangsu;Nam, Choonsung
    • International Journal of Contents
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    • v.10 no.2
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    • pp.9-17
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    • 2014
  • Since vehicles' trajectories are so complex and dense traffic changes in nature frequently, the VANET (Vehicles Ad-hoc Network), using Omni-directional Antenna, has many channel collisions (or overlapping) on Data Link phrases (MAC layers). It is not easy to keep a good seamless communication status for VANET because of its unpredictable network environment. Among VANET research, Directional Antenna have been proposed as one of the most common systematical solutions to reduce (or to mitigate) this miss-communication problems by narrowing communicational ranges and making use of its customized error-detection process. However, even though Directional Antennas help VANET keep good seamless communication, many VANET researchers have reported that Directional VANET still has miss-communicational problems - this has lead to problems like 'Directional Hidden Terminal Problem', 'Deafness', 'Un-accuracy Lobe Scopes' and 'High Deployment Cost' being reported in various papers. To establish well-organized design assessments for a good Directional VANET MAC protocol to overcome these problems, we rearranged and grouped current Directional VANET' qualitative criteria from several current survey papers using these categories- 'Directional Discovery', 'Directional Forwarding' and 'Directional Handover'. In addition, based on the results of the following analysis, we show the essential design concerns that need to be looked at in order to develop a well-designed Directional-VANET MAC protocol.

A Study on the Disaster Safety Communication Network (재난안전통신망에 관한 연구)

  • Kang, Heau-Jo
    • Journal of Advanced Navigation Technology
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    • v.18 no.1
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    • pp.95-100
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    • 2014
  • The disaster safety communication infrastructure is necessary basic infrastructure for protection of people's lives, safety and wealth. In order to build this infrastructure needs ensure public safety disaster communication technology and cooperation disaster recovery agencies. Recently advanced national disaster safety communication infrastructure necessity according to people's expectations increase for public safety is emerging as domestic and international. And there is situation which required leading rolls of country. In this paper, we analyzed public disaster safety communication status of domestic and international. Also, we analyzed Korea disaster safety communication management necessity and proposed its policy implication.