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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.
Ethylene glycol에 의해 액화된 폐지로부터 polyester 제조
김동헌(Dong Hun Lee),김창준(Chang-Joon Kim),김성배(Sung Bae Kim) 한국생물공학회 2011 KSBB Journal Vol.26 No.3
Polyester was prepared through the esterification reaction between watsepaper liquefied by ethylene glycol and carboxylic acid. Liquefaction was carried out at the previously determined condition of 100 minutes, 160℃, and 3% sulfuric acid, and the hydroxyl value of the liquefied product was 411 mg KOH/g. In order to remove bubbles produced during the curing step, the method to introduce a slight nitrogen stream into reaction vessel and/or the method to preheat a polyester film at 85℃ before curing step were used alone or in combination. But if curing temperature was 130℃, simple method to cure a film for 5 hours at 130℃ without using both methods was found to be most effective. The polyesters prepared with various carboxylic acids showed significant different physical properties, and maleic acid was best among them. Also, the effect of reaction time and temperature, C/H (carboxyl group/hydroxyl group) ratio, and type of additive on the crosslinkage of polyester was investigated. Lithium hydroxide or citric acid as additive was used to enhance the crosslinkage of polyester and citric acid was proved to be much more effective than lithium hydroxide. The effect of reaction temperature on the crosslinkage was marginal, but the crosslinkage decreased above 130℃. The crosslinkage was 86% when the polyester was prepared at an optimum condition such as 130℃ and 15 minutes of reaction condition, 1.5 of C/H ratio, 130℃ and 5 hours of curing condition, and 10% addition of citric acid.
김동헌(Dong Hun Kim) 한국지능시스템학회 2009 한국지능시스템학회논문지 Vol.19 No.2
본 논문은 수중 차의 차속도와 프로펠러 각속도를 추정하는 문제를 다룬다. 계단식 관측기는 측정된 위치 값으로부터 속도 값 추정을 위해 사용한다. 고이득 관측기(high-gain observer)에 전형적으로 생기는 전형적인 문제를 없애기 위하여 계단식 구조의 관측기가 설계되었다. 고이득 관측기처럼 시스템 다이나믹스와 파라미터로부터 무관하게 설계할 수 있으며, 단순한 구조를 가진다. 관측기의 첫 단계에서 출력 값이 추정되고, 측정된 출력의 1계 미분 값이 관측기의 두 번째 단계를 통해 추정된다. 또한 출력의 n 번째 미분 값은 관측기의 n+1 번째 단계에서 추정된다. 제안된 관측기가 전체 점근적 안정도를 보장함을 보여준다. 시뮬레이션 결과는 기존의 고이득 관측기에 비해 제안된 관측기가 수중 차의 차속도와 프로펠러 각속도를 더 우수하게 추정함을 보여준다. This paper investigates the estimation problem of vehicle velocity and propeller angular velocity on the underwater vehicle. Inspired by but different from a high-gain observer, the cascade observer features a cascade structure and adaptive observer gains. In doing so the cascade observer attempts to overcome some of the typical problems that may pose to a high-gain observer. As in the case of a high-gain observer, the cascade observer structure is simple and universal in the sense that it is independent of the system dynamics and parameters. A cascade observer is used for the estimation of velocity from measured position. In the 1st step of the observer, the output is estimated, and the 1st order derivative of measured output is estimated via the 2nd step of the observer. Also, nth order derivative of the output is estimated in the (n+1)th step of the observer. It is shown that the proposed observer guarantees globally asymptotical stability. By simulation results, the proposed observer scheme for the estimations of vehicle velocity and propeller angular velocity shows better performance than the scheme based on the existing observer.