• 제어로봇시스템학회:학술대회논문집
• /
• 1997.10a
• /
• pp.227-230
• /
• 1997

In this paper, robot navigation experiments with a new navigation algorithm are carried out in real environments. The authors already proposed a reactive navigation algorithm for mobile robots using optimal via-point selection method. At each sampling time, a number of via-point candidates is constructed with various candidates of heading angles and velocities. The robot detects surrounding obstacles, and the proposed algorithm utilizes fuzzy multi-attribute decision making in selecting the optimal via-point the robot would proceed at next step. Fuzzy decision making allows the robot to choose the most qualified via-point even when the two navigation goals-obstacle avoidance and target point reaching-conflict each other. The experimental result shows the successful navigation can be achieved with the proposed navigation algorithm for real environments.

• Asian Journal for Public Opinion Research
• /
• v.7 no.4
• /
• pp.207-225
• /
• 2019

Despite a vast amount of research on the relationship between personality traits and political attitudes, little is known about the effects of personality on individuals' support for the political system of their own country. Using three nationally representative datasets from South Korea, the present study shows that the personality dimensions - particularly, Agreeableness - are positively associated with political support, which encompasses confidence in the presidency, confidence in the government, and national pride. These findings suggest that two facets of Agreeableness - trust and compliance - are activated in expressing individuals' support for their political system. Thus, mobilizing citizens who score high on Agreeableness is essential to maintain political stability and legitimacy, but such a task appears to be difficult, given that ideological polarization discourages them from being politically active due to their propensity to conflict avoidance.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.04a
• /
• pp.124-126
• /
• 2002

최근의 TDMA(Time Division Multiple Access) 알고리즘에 대한 발전 방향을 살펴보면 크게 두 가지로 요약할 수 있다. 먼저, 대용량의 데이터 - 멀티미디어 데이터 등 - 에 대한 활용이 많아짐에 따라 전송할 데이터를 적절하게 Scheduling하여 전송 효율을 증대시키는 접근 방향이 있으며, 또 다른 접근으로는 Time Slot에 대한 재사용성이나 Slot 할당 기법의 개선을 통하여 성능을 향상시키는 방법이 있다. 본 논문에서는 후자에 거론된 Time Slot에 대한 재사용성이나 Slot 할당 기법의 개선 방법 중의 하나인 STDMA(Self-organized TDMA)알고리즘에서, Slot 할당 시의 충돌 회피 방법을 고려하여 기존의 STDMA 알고리즘의 효율을 향상시키고자 한다. 현재 STDMA 알고리즘에서는 가용한 통신 범위 내에서의 Slot에 대한 할당 여부가 알고리즘 내에서 정의되고 있다. 따라서 부가적인 알고리즘의 추가가 없이 Slot할당 상황을 알 수 있으며, 이를 통하여 Slot 할당 단계에서 충돌 회피 방법을 추가하여 Conflict를 회피하도록 할 수 있다.

• Journal of Korean Institute of Industrial Engineers
• /
• v.20 no.1
• /
• pp.53-69
• /
• 1994

Deadlock in flexible manufacturing systems (FMS) which refers to the stop state of job flow in the system can be commonly occurred in operating FMS. This state mainly due to bad movements of jobs and commonly job routings should be avoided to maximize the utilization of high-capital resources in this study, the deadlock generated from the conflict between flow objects competing to occupy space resources in FMS is investigated. Capacity Designated Directed Graph (CDG) is constructed to represent the space resources and flow object routings. From the characteristics of CDG, an algorithm for the detection of the deadlock possibility is proposed. Finally two deadlock avoidance rule are proposed and implemented in the control on Automated Guided Vehicle system in an FMS.

• Journal of Korean Academy of Nursing
• /
• v.26 no.1
• /
• pp.107-126
• /
• 1996

The Purpose of this study was to build a substantive theory about the experience of postpartum depression. The qualitative research method used was rounded theory. The interviewees were eight others who had experienced postpartum depression. The data were collected through in-depth interviews with audiotape recording done by the investigator over a period of twelve months. he data were analyzed simultaneously by a constant comparative method in which new data were continuously coded into categories and properties according to Strauss and Corbin's methodology. Analysis the grounded data resulted in 28 concepts being identified. Eight categories emerged from the analysis. The categories were regret, loss of freedom, isolation of oneself, heartache, loss, emotional upset, avoidance, recovery. These substantive categories are consistent with precious research results. Causal conditions included : regret, loss of freedom. Phenomena : heartache, loss, emotional upset. Context : isolation oneself. Intervention condition : avoidance. Action/interaction strategies : desire for recovery. Consequences : recovery. These categories were synthesized into the core concept-The process of filling the empty loss of self. The process of the experienced postpartum depression was ① change after delivery, ② searching for a reason for depression, ③ effort to recover from postpartum depression, ④ recovery from postpartum depression and return to previous life. The process of recovery from postpartum depression was proceeded by ① support from others, especially husband, ② resolution of stressful life events, ③ reconstructing of life goals and resolution strategies, ④ acceptance of depression and seeking psychiatric treatment. Seven hypotheses were derived from the analysis. ① Mothers who experienced stressful life event and economic problem are more depressive. ② Mothers who have conflict with parents are more depressive. ③ The more somatic symptoms, the more depression. ④ Social support facilitates recovery from postpartum depression. ⑤ Mothers who have lower self-esteem are more depressive. ⑥ Mother's role overload disturbs recovery from postpartum depression. ⑦ Ideal maternal identity facilitates recovery from postpartum depression. Through this substantive theory, nurses can understand the importance of postpartum depression management.

• Korean Journal of Cognitive Science
• /
• v.23 no.1
• /
• pp.25-46
• /
• 2012

When performing a monotonous task, one often experiences an urge to quit. This urge may vary depending on how long one has performed the task (a temporal factor) and on which particular component of the task one is carrying out (an event-based factor). Using the Stroop task and a working memory task, we examined changes in the urge to quit as a function of basic temporal (repetition) and event-based (cognitive conflict) factors. Consistent with the law of least work and recent theorizing, for the memory task, urges to quit were greater following difficult trials; for the Stroop task, urges to quit were greater following incongruent than congruent trials, but only during early/novice phases of performance, when responding is inefficient. This is a demonstration of an avoidance response toward cognitive conflict. Regarding temporal sources of quitting, urges to quit were greater for late task stages than early stages. These basic findings may illuminate the nature of the more 'hot' motivational struggles involving the delay of gratification.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.12 no.10
• /
• pp.4754-4773
• /
• 2018

In sensor medium access control (SMAC) protocol, sensor nodes can only access the channel in the scheduling and listening period. However, this fixed working method may generate data latency and high conflict. To solve those problems, scheduling duty in the original SMAC protocol is divided into multiple small scheduling duties (micro duty MD). By applying different micro-dispersed contention channel, sensor nodes can reduce the collision probability of the data and thereby save energy. Based on the given micro-duty, this paper presents an adaptive duty cycle (DC) and back-off algorithm, aiming at detecting the fixed duty cycle in SMAC protocol. According to the given buffer queue length, sensor nodes dynamically change the duty cycle. In the context of low duty cycle and low flow, fair binary exponential back-off (F-BEB) algorithm is applied to reduce data latency. In the context of high duty cycle and high flow, capture avoidance binary exponential back-off (CA-BEB) algorithm is used to further reduce the conflict probability for saving energy consumption. Based on the above two contexts, we propose an improved SMAC protocol, micro duty adaptive SMAC protocol (MDA-SMAC). Comparing the performance between MDA-SMAC protocol and SMAC protocol on the NS-2 simulation platform, the results show that, MDA-SMAC protocol performs better in terms of energy consumption, latency and effective throughput than SMAC protocol, especially in the condition of more crowded network traffic and more sensor nodes.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.15 no.5
• /
• pp.71-82
• /
• 2016

Information System for rear-end collision avoidance is a unit service of C-ITS pilot project. Road environment that the number of vehicles at the same driving high-speed has a possibility that the communication delay or failure caused by heavy load of vehicle to vehicle communication. In this study, effects of the road network about a communication failure rate of information system for rear-end collision avoidance was analyzed quantitatively with micro traffic simulation. The simulation was carried out in situation that crash of two vehicles are occurred at merging area with speed limit 80km/h and information of collision is prvoided to the rear vehicle. From simulation results, it can confirm the trend of the increasing 14% of potential conflict according to 10% increasing of the communication failure rate. C-ITS service has a goal of increasing safety. The coommunication failure rate increases due to heavy load of vehicle causes a fatal result in road safety administrator position. For the success of C-ITS project, a communication system developers side should perform the effort to reduce the communication failure rate.

• The Journal of Korean Academic Society of Nursing Education
• /
• v.24 no.1
• /
• pp.50-60
• /
• 2018

Purpose: This study aims to determine the bioethical subjectivity of nursing students with experience volunteering in elderly care facilities, and the characteristics that comprise the types thereof. Methods: Q methodology, which analyzes the subjectivity of each type, was used. The 37 selected Q statements from 32 participants were classified into the shape of a normal distribution using a 9-point scale. The collected data were analyzed using the PC-QUANL program. Results: The survey revealed that the bioethical subjectivity of nursing students with experience volunteering in elderly care facilities can be divided into three types: a rational dignity emphasis, an autonomous right to life belief, and conflict avoidance. All three attitudes regard human beings as possessing dignity, and life and death as elements to be experienced as aspects of human life. Bioethical values are critical to treatment and care; however, it is sometimes also held that humans have the right to commit suicide. Conclusion: This study enhanced our awareness of nursing students' bioethics. The findings can be used as a basis for the design of differentiated bioethics education according to each type of bioethical subjectivity. This calls for diverse research on bioethics and the implementation of effective bioethics education.

• Journal of Family Relations
• /
• v.23 no.3
• /
• pp.77-104
• /
• 2018

Objectives: This study aimed to examine the general tendencies of women's divorce intention and to analyze the related variables that affect women's divorce intention. It would help explore the conditions for prevention or intervention of divorce. Methods: For this purpose, the structured survey was conducted by 521 married women aged between 20 and 70 living in Jeollanam-do and Gwangju. The data was analysed by SPSS 21.0 program. Results: First, the average score of divorce intention was 2.04, which was lower than the middle. The average score of self-differentiation, marital communication efficiency, reasonable coping, and social support were a bit higher than the median score. Second, the differences in the divorce intention according to the academic background and household income were statistically significant. Third, marital communication efficiency had the biggest effect on divorce intention and it was followed by avoidance-oriented behavior, reasonable coping, support from the local community, self-differentiation, and household income. Conclusion: It is very important to understand the various factors related to divorce intention especially in individual, marital, social aspects. In addition, it is actually required to develop the couple programs about coping strategies, effective couple communication and problem-solving methods. It also have to imply the requirements considering psychological, social aspects such as self-differentiation and social support.