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IEEE 802.11 무선랜에서 캡쳐 효과를 고려한 Fair MAC 알고리즘
정지웅(Jiwoong Jeong),최선웅(Sunwoong Choi),김종권(Chong-kwon Kim) 한국정보과학회 2010 정보과학회논문지 : 정보통신 Vol.37 No.5
802.11 무선랜의 편리함으로 인해 무선랜의 광범위한 보급은 WiFi가 오늘날 인터넷 접근 기술에서 없어서는 안 될 부분이 되었다. 인터넷 접근 망의 연구는 단대단 성능에 지대한 영향을 미치는 중요한 역할을 함에도 불구하고 과거 연구는 캡쳐 효과(capture effect)로 기인한 오작동에 대한 충분한 고려없이 MAC 프로토콜의 성능향상, 분석, 또는 시뮬레이션 평가를 수행해 왔다. 또한, 캡쳐 효과는 무선 환경에서 빈번하게 발생하고 있으며 노드 간에 불평등을 초래하는 것으로 알려져 왔다. 그래서, 우리는 그러한 불평등한 환경 하에서 형평성(fairness)을 제공할 수 있는 Fair MAC 알고리즘을 제안한다. 또한, 노드간에 형평성을 유지함과 동시에 시스템 전체 처리율(throughput)을 최대화되도록 한다. 시뮬레이션 결과는 제안된 Fair MAC 알고리즘이 처리율 감소 없이 형평성을 달성하는 것을 보여 준다. Widespread deployment of infrastructure WLANs has made Wi-Fi an integral part of today’s Internet access technology. Despite its crucial role in affecting end-to-end performance, past research has focused on MAC protocol enhancement, analysis, and simulation-based performance evaluation without sufficiently considering a misbehavior stemming from capture effect. It is well known that the capture effect occurs frequently in wireless environment and incurs throughput unfairness between nodes. In this paper, we propose a novel Fair MAC algorithm which achieves fairness even under physically unfair environment. While satisfying the fairness, the proposed algorithm maximizes the system throughput. Extensive simulation results show that the proposed Fair MAC algorithm substantially improves fairness without throughput reduction.
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원시반사통합운동이 신경발달장애 아동의 앞쪽머리자세, 균형능력, 주의집중력에 미치는 효과 : 예비연구
정지웅 ( Ji-ung Jeong ),최한 ( Han Choi ),함석찬 ( Suk-chan Hahm ) 대한통합의학회 2021 대한통합의학회지 Vol.9 No.4
Purpose : Therapeutic exercise should improve the health outcomes of rehabilitation in children with neurodevelopmental disability. The purpose of this study was to investigate the feasibility of primitive reflex integration exercises on forward head posture, balance ability, and concentration in children with neurodevelopmental disability. Methods : This study included 10 children with neurodevelopmental disability. Primitive reflex integration exercises were performed for 40 minutes, twice a week for 8 weeks (16 sessions). The reflective markers were placed at the center of the shoulders and on the ears. A caliper was used to measure the distance between the attachments of the reflective markers to assess the forward head posture. Pediatric balance scale was used to quantify balance ability. Their abilities in terms of changeless sitting, looking at the teacher, putting children’s hands on their knees, and looking at immovable and movable objects, were assessed to quantify concentration. Results : There were significant improvements in forward head posture after the intervention (p=.005). Primitive reflex integration exercises significantly improved balance ability of children with neurodevelopmental disability (p=.027). There were also significant improvements in changeless sitting (p=.005), looking at the teacher (p=.004), putting children’s hands on their knees (p=.005), and looking at the immovable (p=.004) and movable (p=.004) objects. Conclusion : This study showed that primitive reflex integration exercises were a useful intervention to improve forward head posture, balance, and concentration in children with neurodevelopmental disability. Therefore, primitive reflex integration exercises may also promote and improve their general development. Further studies with appropriate sample size and control group are needed to conclude the effectiveness of primitive reflex integration exercises on improving posture, motor function, and concentration in children with neurodevelopmental disability.
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정지웅 ( Ji Woong Jeong ) 한국교회사회사업학회 2013 교회와 사회복지 Vol.23 No.-
The purposes of this study are to compare German Diakonie and Korean Protestant social welfare and through this, to examine the significances and limitations of German Diakonie to Korean Protestant social welfare. The results of comparing the product of German Diakonie and Korean Protestant social welfare are as follows. First, in the case of the delivery system, Korean Protestant social welfare delivered social services through the social welfare corporation under the control of the governments, or through the form which individual churches provides services. However, German Diakonie had a form that provides the service through the control of welfare specializing corporation which the whole German Protestant churches established and federal association of voluntary welfare. Second, in the case of the financial system, Korean Protestant social welfare services were performed by donations or government subsidies. However, German Diakonie`s services were performed by social insurance, public assistance, and donations. This paper showed that these kind of differences of the delivery system and the financial system can occur the distinction of expertise of religious social welfare, overlapping or omitting in service supply, the quality of services through competition, and the extent of realization of Protestant social welfare philosophy. And on the basis of the analysis results, this article recommended the policy for the improvement of Protestant social welfare and religious social welfare of Korea.
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정지웅 ( Ji-woong Jeong ),유민재 ( Min-jae Yu ),강희용 ( Huiy-yong Kang ),이충호 ( Choong-ho Lee ) 한국농업기계학회 2021 한국농업기계학회 학술발표논문집 Vol.26 No.1
전동 농기계의 작동시 사용자의 직접적인 하중을 받는 핸들 프레임의 안전성을 확인하기 위한 구조해석을 수행하였다. 핸들 프레임 부분의 해석을 진행하기 위해 항복강도 275MPa, 인장강도 310MPa의 물성치를 가진 알루미늄 6061 재질로 설정하였고, 모델링의 구조를 고려하여 프레임의 하부 면에 구속 조건을 지정하였다. Size-Korea에 기재된 한국 성인 남성이 선 자세에서 누르는 평균 힘인 230.39N을 핸들 부분에 사선 방향으로 힘을 부여하였다. 해석 결과 기존 보강대의 지름인 22mm일 때 최대 폰 미세스 응력은 126.2MPa, 안전 계수 2.18이고 보강대를 보완 설계한 지름인 26mm일 때 최대 폰 미세스 응력 76MPa, 안전계수 3.58, 30mm일 때 최대 폰 미세스 응력 65.75MPa, 안전계수 4.18로 도출되었음. 지름이 30mm일 때 안전계수가 40.18이지만 전동 관리기의 무게에 영향을 주어 경량화와 최적 소요동력에 영향을 주지 않는 보강대의 지름 26mm가 최적의 설계 인자인 것을 확인하였다.
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정지웅(Ji-Ung Jeong) 한국콘텐츠학회 2020 한국콘텐츠학회논문지 Vol.20 No.3
본 연구는 북한의 장애인고용정책을 분석하여, 이를 토대로 북한의 장애인고용 증진을 위한 정책 발전 방안을 제안하고자 수행되었다. 이를 위하여 정책분석의 맥락으로서 북한 장애인고용 관련 법규, 고용 현황 등을 문헌연구, 2차 자료 분석 등을 통해 고찰하였으며, 이후 북한의 장애인고용정책을 Gilbert and Specht(1974)의 정책 산출물 분석틀에 따라 분석하였다. 본 연구의 분석 결과는 다음과 같다. 첫째, 북한 장애인고용정책의 급여형태는 고용급여, 직업능력개발급여 등이다. 둘째, 장애인고용정책의 내용은 분리고용이 주를 이루고 있다. 셋째, 장애인고용정책의 할당은 경증·신체장애인 중심으로 이루어지고 있다. 넷째, 장애인고용정책의 전달체계는 내각의 각 성과 각 시도·시군구 인민위원회를 중심으로 분절적으로 구성되어 있다. 본 연구에서는 이상의 분석결과를 토대로 북한 장애인고용정책 발전 방안을 법규 정비, 급여형태 다양화, 전달체계 개편 등으로 제시하였다. The purpose of this study is to analyze the employment policy for persons with disabilities, and to propose a policy development plan to promote employment of persons with disabilities in North Korea. For this purpose, this study reviewed the laws and employment status related in persons with disabilities in North Korea through literature studies and secondary data analysis as the context of the policy analysis. Since then, North Koreas employment policy for persons with disabilities was analyzed according to the framework of Gilbert and Specht(1974). The results of this study are as follows. First, the benefits of the North Korean employment policy for persons with disabilities are employment benefits and vocational skills development benefits. Second, segregated employment is mainly composed of employment policy for persons with disabilities. Third, the allocation of employment policy for persons with disabilities is centered on persons with mild and physical disabilities. Fourth, the delivery system of employment policy for persons with disabilities is segmented around the Cabinets and the Peoples Committee of each municipality. Based on the results of this analysis, this study suggests the development of employment policy for persons with disabilities in North Korea through the revision of regulations, the diversification of benefits, and the reorganization of delivery systems.
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