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울산광역시 장애인 구강건강증진을 위한 자원봉사 중심의 지속적 치과진료사업의 사례
김진범(Jin-Bom Kim),김병재(Byung-Jae Kim),한동헌(Dong-Hun Han),전은주(Eun-Joo Jun),김한나(Han-Na Kim),김민지(Min-Ji Kim) 대한치과의사협회 2015 대한치과의사협회지 Vol.53 No.11
The purpose of this study was to evaluate the oral health promotion of the disabled persons by voluntary dental services in Ulsan Metropolitan City. Two dentists taken a calibration training for national oral health survey examined the oral health status of 473 disabled persons from two special schools for the disabled children and adolescents, a residential facility and a gymnasium for the disabled persons in 2009-2010. The surveyed disabled persons in the age range was from 7 to 74 years old. Voluntary dentists, oral hygienists and other civilian volunteers had supplied with the oral health care services to the disabled persons at dental clinics of special schools for the disabled children and adolescents, and a dental clinic supported from Nam-Gu Public Health Center in Ulsan Metropolitan City since 1997. The obtained data from these surveys were analyzed with the SPSS statistical package. Among subjects aged 12-14 years, subjects with decayed, missing and filled teeth (DMFT) in permanent dentition was 46.9%; subjects with untreated decayed teeth, 17.2%. The number of decayed, missing and filled teeth in permanent dentition was 1.36. The proportion of decayed components of DMFT score was 28.00%; proportion of missing components of DMFT score, 1.43%; proportion of filled components of DMFT score, 70.57%. The proportion of filled components of DMFT score among disabled persons of all age group in Ulsan were evaluated to be a similar level to non-disabled citizens in Ulsan from 2010 Korean National Survey. The oral health care programs for disabled persons by voluntary services of dental professionals and other civilians are evaluated to be effective for the oral health promotion of disabled persons in Ulsan.
Flexible and Scalable Formation for Unicycle Robots
Dong Hun Kim(김동헌),Young Kwun Lee(이용권),Sung-Ill Kim(김성일),Wee-Jae Shin(신위재),Hyun-Woo Lee(이현우) 한국지능시스템학회 2005 한국지능시스템학회 학술발표 논문집 Vol.15 No.2
This paper presents a self-organizing scheme for multi-agent swarm systems based on coupled nonlinear oscillators (CNOs). In this scheme, unicycle robots self-organize to flock and arrange group formation through attractive and repulsive forces among themselves. It is also shown how localized distributed controls are utilized throughout group behaviors such as formation and migration. In the paper, the proposed formation ensures safe separation and good cohesion performance among the robots. Several examples show that the proposed method for group formation performs the group behaviors such as reference path following, obstacle avoidance and flocking, and the formation characteristics such as flexibility and scalability, effectively.
김동헌(Dong-Hun Kim) 한국비서학회 2002 비서·사무경영연구 Vol.11 No.1
The primary purpose of this study is to research the table of organization of secretaries in an organization, on the side of organizational design and to suggest alternatives. Secretarial services as a job has some special characteristics of its own. The demand of secretarial manpower for an enterprise is comparatively small and sporadic in comparison to that of others. Even though there is no exclusive secretarial services firm or industry, there are secretarial job positions in many firms and organizations. The above mentioned are special features of secretarial services. However, due to the reasons mentioned above, organizational structure is comparatively underdeveloped. In the view point. of organizational design and structure, secretarial functions are neither horizontally differentiated nor vertically differentiated. The degree of formalization of secretarial functions is comparatively low. There are few organization that put the secretarial department as an independent unit in its organization chart, even though the organization employs secretarial functions. The. secretarial organization structure can be considered as a sort of hardware and the ability, skill and knowledge of a secretary is considered as a sort of software. Secretarial services has been well developed as software and as a result of that, many managers in organizations became more aware of the necessity of secretarial functions than ever before. In order to maintain the stability of secretarial functions in organizations, both the hardware and software have to be developed at the same time. In this study as an organization design tool, the concept of organization set, and role set have been incorporated.
김동헌(Dong Hun Kim) 제어로봇시스템학회 2021 제어·로봇·시스템학회 논문지 Vol.27 No.3
This paper presents the design of a variable potential field for dynamic obstacle avoidance by mobile robots. In this scheme, the RPF (Repulsive Potential Field) for obstacle avoidance has a different magnitude in each direction based on the angle between a goal and an obstacle, unlike a conventional RPF in which the magnitude is the same in each direction. Conventional potential field designs for path planning use scaling parameters of the potential field as fixed values. Therefore, the local minimum problem occurs because of which the robot cannot reach its destination. This is because of the obstacle in the approach to the destination due to repulsive forces in all directions around the potential field. Similarly, studies on existing potential field designs for avoiding dynamic obstacles have used methods such as fixed obstacles by designing only the location of the dynamic obstacles in the current step. Therefore, a collision is inevitable when the dynamic obstacle moves faster than the robot. Thus, in this study, the scaling parameters of the RPF were designed using variable values depending on the locations of the obstacle and destination. In addition, a new field design was developed for obstacle avoidance considering the speeds of dynamic obstacles. The experimental results proved that a potential field could be effectively designed for avoiding dynamic obstacles and those near the destination.
한동헌(Dong-Hun Han),김민지(Min-Ji Kim),전은주(Eun-Joo Jun),김진범(Jin-Bom Kim) 대한치과의사협회 2012 대한치과의사협회지 Vol.50 No.9
Dental caries is multifactorial local disease which involves destruction of the hard tissues of the teeth by metabolities produces by microorganisms. Recently, there has been growing interest in the role of nitric oxide (NO) and glutathione (GSH) in caries incidence. The aim of the study was to survey the studies reported the association among salivary NO, GSH and dental careis. Three studies reported the association between NO and dental caries. However, the results were contradictory. Only one study showed negative association between GSH and dental caries. In Korea, NO showed negative association with Lactobacilli and GSH showed positive association with dental caries. These observations suggest the possibility that NO and GSH could be new biomarkers for dental caries. However, further study should be needed.