• Title, Summary, Keyword: group system

Search Result 11,039, Processing Time 0.077 seconds

UAV Control System Design Using Backstepping-Sliding Mode Controller

  • Han, Jong-Ho;Hwang, Myeong-Hwan;Kim, Dong-Hyun;Lee, Gye-Seong;Cha, Hyun-Ro
    • Journal of Advanced Engineering and Technology
    • /
    • v.11 no.3
    • /
    • pp.183-190
    • /
    • 2018
  • This paper presents a backstepping sliding mode controller for UAV(unmanned aerial vehicles) to implement the attitude and position tracking control. First, dynamic model is introduced for the UAV. The Newton-Euler method has been used to derive the defining equations of motion of the six-degree system. The method was obtained by modelling the kinetic and potential energy of the system and the external forces obtained from the aerodynamic analysis. Secondly, the backstepping sliding mode controller is proposed to develop the attitude and position control system for the UAV system and the system was conducted by Matlab/Simulink. Comparative simulation results with other control systems such as backstepping and sliding mode controller and the proposed control scheme show the efficiency of other control systems.

Application Management System with ZeroMQ and Alarms in Distribution Management System (배전운영 시스템에서의 ZeroMQ와 알람 정보를 이용한 운영기능 관리 시스템)

  • Kim, Pil-Seok;Kang, Ho-Young;Lim, Il-Hyung;Park, Jong-Ho;Shin, Yong-Hak
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.64 no.8
    • /
    • pp.1161-1167
    • /
    • 2015
  • Distribution Management System(DMS) ienhancing distribution automation system-based operation efficiency is an optimized system by various operational applications in a distribution network. DMS employs various applications like topology reconfiguration, volt/var control, and restoration at events such as overload, voltage violation, and a fault in a distribution system. An operation efficiency to employ multi-applications as restoration with short-term load forecasting is higher than a performance by a single application; and the applications are accomplished by an operator’s control. Applications’ combination is determined by various alarm information which means critical issues in order to operate a distribution system. Thus, this paper proposes an application management system which can configure application combination, control applications depending on alarm information and check their performance condition. The proposed application management system can be customized by operator easily and have high operation efficiency and reliability because it is worked by reviewed alarm information from operator.

Evaluation of the Interruption Cost of Distribution Power Systems Considering the Failure Source and the Composite Customer Interruption Cost

  • Park, Sang-Bong;Nam, Kee-Young;Kim, Dae-Kyeong;Jeong, Seong-Hwan
    • KIEE International Transactions on Power Engineering
    • /
    • v.3A no.3
    • /
    • pp.124-129
    • /
    • 2003
  • As the power industry moves towards open competition, there has been a call for methodology to evaluate power system reliability by using composite interruption cost. This paper presents algorithms to evaluate the interruption cost of distribution power systems by taking into consideration the failure source and the composite customer interruption cost. From the consumer's standpoint, the composite customer interruption cost is considered as the most valuable index to estimate the reliability of a power distribution system. This paper presents new algorithms that take into account the load by customer type and failure probability by distribution facilities while calculating the amount of unserved energy by customer type. Finally, evaluation results of unserved energy and system interruption cost based on composite customer interruption cost are shown in detail.

Health Problem of the Middle-Aged Women (종합 건강검진 과정에서 나타난 일부 중년기 여성의 건강문제)

  • 성미혜
    • Journal of Korean Academy of Nursing
    • /
    • v.29 no.2
    • /
    • pp.258-270
    • /
    • 1999
  • This study was carried out to offer the basic data for more qualitative lives of the middle-aged women through their health maintenance and control. So, the researcher reviewed and analyzed the health problems of the middle-aged women, the differences of main symptoms in each subject, positive ratcs in screening tests, the difference of screening tests with age and the correlation of obesity and blood pressure with screening tests. All subjects were 218 women(40-59years) who had a check-up at a comprehensive health check-up center in K University Hospital in Seoul from July 1, 1998 to August 31. 1998. Questionaires were developed to get subjects, general characteristics. main symptoms, medical examination and diagnosed disease by the researcher referring through the questionaires of comprehensive health check-up center and the medical recorders were used as a tool of study. The researcher analyzed the data with SPSS PC+ ; the distribution of the subjects, general characteristics and main symptoms with percentage : the difference between main symptoms and screening tests with X$^2$-test, ANOVA. The results are as follows. 1) Among the age distribution, most were 40-45 years old and unemployed. 2) The most common complaints were indigestion in digestive system, cough in respiratory system, heart beat in cardiovascular system, general sweat in endocrine system. edema in urinary system, easy bruise in hematologic system, backache in musculoskeletal system, headache in psychoneurologic system, lochia in gynecology, itch in dermatology system, eye ball pain in visual system and tinnitus in auditory system. 3) In main symptoms according to age, the 40-45 age group had a higher rate of complaints in digestive system and gynecology than other age group ; the 46-49 age group in endocrine system. 4) The main symptoms according to diagnosis had no difference statistically. 5) The screening tests which showed high rates of abnormality were mammography(the highest), abdominal ultrasonography, upper gastrointestinal series/gastrofiberscopy, PFT. In all age group the highest rate of abnormality was seen in mammography. 6) In screening tests according to age. the 46-49 age group showed higher positive rates of pap smear, blood sugar test, urine test than any other age group ; the 50-55 age group showerd higher positive rates of obesity, BP, chest X-ray, abdominal ultrasonography, ESR, SGOT, CRP and urine micro. 7) In correlation of obesity with screening test, the obesity group showed higher positive rates of blood pressure, chest X-ray, abdominal ultrasonography, HCT and CRP than the normal weight group. 8) In correlation of blood pressure with screening test, the hypertension group showed higher positive rate of obesity, chest X-ray, abdominal ultrasonography, pap smear and blood sugar than the normal blood pressure group. In conculusion, the middle-aged women have various physical symptoms and affected by age. The obesity and BP have an important effect on the health of the middle aged women. Therefore, this study is considered significant as data for qualitative lives of the middle-aged women playing an important part of family health care by catching of their health problem complaints for prevention of disease and promotion of health.

  • PDF

An Analysis of the Group Decision Making for the Development of a Korean Group Support System: The Field Experiment using Office Workers (우리나라 Group Support System 개발을 위한 집단 의사 결정 특성 분석: 사무실 근로자들을 대상으로 한 실험 연구)

  • Chun, Ki-Jeong
    • Asia pacific journal of information systems
    • /
    • v.9 no.1
    • /
    • pp.143-163
    • /
    • 1999
  • This study investigates the effect of group size on group performance, here the quality of group decision, Four effects are proposed and tested in a field experimental setting : (1) the relationship between the group size and the distribution of individual's problem-solving ability ; (2) the change of the group decision quality as group size increases ; (3) the relationship between the group decision quality and the quality of the best/worst member as group size increases ; (4) the relationship between the group decision quality and the average quality of individuals in the group as group size increases. Data showed that contrary to the exiting results, group decision quality was not improved with the group size. Rather, it showed a little tendency that group decision quality was worsened with the group size. Data also showed that consensus-oriented group decision making process produced the compromised output. Thus, group decision quality was not better than the average group members'. The opinion of the best member was not accepted. The implications of the findings are discussed for the development of a Korean GSS.

  • PDF

Cure Mechanism of DGEBA/MDA/SN System

  • Shim, Mi-Ja;Kim, Seong-Uk
    • Korean Journal of Materials Research
    • /
    • v.3 no.3
    • /
    • pp.272-275
    • /
    • 1993
  • To modify the toughness of epoxy for matrix, succinonitrile(SN) was introduced to diglycidy1 ether of bisphenol-A (DGEBA)/methylene dianiline(MDA)system. Cure reaction mdchanism of the DGEBA/MDA/SN system was strdied through Fourier transform infrared(FT-IR) spectrometry. As a result, the reaction of nitrile group of SN with secondary amine and with hydroxy1 group prevented the reaction of hydroxy1 group with epoxide group from crossoinding. Nitrile groups produced amide group by reacting with hydroxy1 groups and made a lowered crosslind density in chain networks.

  • PDF

The influence of complex traditional Korean medical treatment on the Peripheral Facial Paralysis induced stress (한방복합치료(韓方複合治療)가 STRESS로 유발된 말초성안면신경마비(末梢性顔面神經麻痺)에 미치는 영향)

  • Kim, Kyung-tae;Song, Ho-sueb
    • Journal of Acupuncture Research
    • /
    • v.21 no.4
    • /
    • pp.53-64
    • /
    • 2004
  • Objective: This study was to evaluate the influence of stress on Peripheral Facial Paralysis during the complex traditional korean medical treatment. Methods: We investigated 41 cases of patients with Peripheral Facial Paralysis who were given the complex traditional korean medical treatment. one group had stress as main factor, the other group didn't it. we evaluated the treatment effect of each group by using Gross Grading System of House-Brackmann, Yanagihara's Unweighed Grading System. Results : 1. In age, sex, lesion, duration of disease, frequency of treatment, duration of treatment, we found that two groups have no significant differences. 2. Pain back of the ear showed the highest frequency in symptoms at onset. 3. Boyangwhanotang showed the highest frequency in oriental herb medicine treatment. 4. As a result of evaluation by using Gross Grading System of House-Brackmann, Yanagihara's Unweighed Grading System, treatment score after 2weeks was marked more higher than score before treatment and treatment score after final treatment was more higher than treatment score after 2weeks on each groups. 5. After final treatment, Non-stress group had signficant result on Gross Grading System of House-Brackmann, Yanagihara's Unweighed Grading System compared with stress group. Conclusion : These results suggested that patient with Non-stress group should be get better than stress group.

  • PDF

Conflict Resolution and Group Decision-Making - Exploring the Dynamics of Conflict Resolution at tile Group Level -

  • Lopez, Luis
    • Korean System Dynamics Review
    • /
    • v.6 no.2
    • /
    • pp.37-52
    • /
    • 2005
  • Conflict resolution in decision-making groups is studied using a System Dynamics model. The model is developed using a grounded-theory approach. Some preliminary results are shown. The results seem to be in line with much empirical research done in the management literature about conflict and conflict resolution at the group level of analysis. Ideas for further research are discussed.

  • PDF