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Two-Step Scheduling Scheme to Support Fairness and QoS in DVB-S2 System
( Mankyu Park ),( Dongbae Kang ),( Deockgil Oh ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.11
The use of an efficient packet scheduling scheme for a forward link in satellite communication networks is very important to support fairness for each return channel satellite terminal (RCST) and the service differentiations for user traffics. To support fairness and QoS for each RCST with service-level agreement (SLA), the Adaptive Coding and Modulation (ACM) system in a satellite hub has to process packets with considering modulation and coding (MODCOD) and packet types. Although a DVB-S2 system with ACM scheme has higher transmission efficiency, it cannot offer fairness or quality of service (QoS) to RCSTs. Because the data are transmitted with high MODCOD in regions with clear skies, while data are transmitted using low MODCOD in regions experiencing rain events. In this paper, we propose a two-step scheduling scheme offering fairness and QoS to RCSTs, while minimizing a decrease in throughput. The proposed scheme is carried out performance evaluations using a computer simulation. As results of this simulation, the proposed scheduler was shown to support bandwidth fairness to an individual RCST, and provide a level of QoS differentiation for user traffics.
박정원 ( Jeongwon Park ),윤희수 ( Heesoo Yoon ),최만규 ( Mankyu Choi ) 한국병원경영학회 2021 병원경영학회지 Vol.26 No.3
Purposes: 우리나라 공공의료기관들의 경영실적 보고에 따르면 대부분의 공공의료기관들이 만성적자로 인한 경영난 문제를 겪고 있는 실정이다. 이는 공공의료서비스 제공 등이 주요 원인이겠지만 그럼에도 공공의료기관들의 경영효율화 문제는 지속적으로 지적되고 있음은 공공연한 사실이다. 이에 본 연구는 고정비 성격이 강한 인적자원관리비용과 경영성과 간의 관계를 분석하여 공공의료기관의 경영성과 개선을 위한 경영적 함의를 제공하고자 하였다. Methodology: 분석자료는 2014년부터 2019년까지 39개 지역거점 공공병원의 재무자료를 이용하였고, STATA SE 12.0을 사용하여 다중회귀분석과 패널회귀분석을 실시하였다. Findings: 다중회귀분석을 통한 단면연구 결과에서는 인건비가 높을수록 경영성과가 높은 경향을(2014년 의료수익:1.523/ 2015년 의료수익: 2.002, 의료수익의료이익률: 0.002/ 2016년 의료수익: 1.223) 보였으나 패널회귀분석을 통한 종단연구 결과에서는 복리후생비가 높을수록 경영성과가 의미있게 높은 경향을(의료수익: 3.232582/ 의료수익의료이익률: 0.0014502) 보였다. 이는 인건비는 경영성과에 단기적인 효과가 있는 반면 복리후생비는 경영성과에 장기적인 효과가 있음을 반영하는 것이라고 볼 수 있다. Practical Implication: 본 연구는 이러한 결과를 기반으로 장기적인 효과가 있는 복리후생비의 중요성을 제시하고, 공공의료기관의 경영성과에 영향을 미치는 인건비와 복리후생비의 특성 파악을 통하여 효과적인 인적자원관리방법을 위한 경영적 함의를 도출하였다는 점에서 의의가 있겠다.
Adaptive Logarithmic Increase Congestion Control Algorithm for Satellite Networks
( Minsu Shin ),( Mankyu Park ),( Deockgil Oh ),( Byungchul Kim ),( And Jaeyong Lee ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.8
This paper presents a new algorithm called the adaptive logarithmic increase and adaptive decrease algorithm (A-LIAD), which mainly addresses the Round-Trip Time (RTT) fairness problem in satellite networks with a very high propagation delay as an alternative to the current TCP congestion control algorithm. We defined a new increasing function in the fashion of a logarithm depending on the increasing factor α, which is different from the other logarithmic increase algorithm adopting a fixed value of α = 2 leading to a binary increase. In A-LIAD, the α value is derived in the RTT function through the analysis. With the modification of the increasing function applied for the congestion avoidance phase, a hybrid scheme is also presented for the slow start phase. From this hybrid scheme, we can avoid an overshooting problem during a slow start phase even without a SACK option. To verify the feasibility of the algorithm for deployment in a high-speed and long-distance network, several aspects are evaluated through an NS-2 simulation. We performed simulations for intra- and inter-fairness as well as utilization in different conditions of varying RTT, bandwidth, and PER. From these simulations, we showed that although A-LIAD is not the best in all aspects, it provides a competitive performance in almost all aspects, especially in the start-up and packet loss impact, and thus can be an alternative TCP congestion control algorithm for high BDP networks including a satellite network.
정신적 장애인의 건강수준과 노동시장 차별경험이 경제활동에 미치는 요인분석
박효은 ( Hyoeun Park ),임국환 ( Kookhwan Rhim ),최만규 ( Mankyu Choi ) 대한보건협회 2015 대한보건연구 Vol.41 No.2
Objective: The aim of the study was to analyze some factors determining economic activities of mentally ill people : First, the factors associated with sociology of population, health resources, and discrimination on labor``s market. Further, the research was to suggest practical and policy implications for boosting economic activities by people with mental disorders. Methods: The data were based on the 4th Panel Survey of Employment for the Disabled(2011) by Korea Employment Agency for the Disabled, including 346 mentally incapacitated people of a total of 5,092 subjects in the study. Logistic regression analysis was performed to examine the factors influencing employment status and those determined by type of disability. Results: The result of the study is as follows. Of 346 subjects of analysis, 64(18.2%) were economically active population, and 284(81.8%), not. In an integrated model, one of the most influencing factors for economic activities was experienced discrimination in job-seeking and employment. Additionally, it showed some favoring factors in economic activities for : those residing in medium-sized cities, those with larger households, those married, those in ``subjectively`` good health, and those independent of daily lives`` assistance. Conclusion: According to our analysis, through these results, some suggestions should be made as follows : Against the backdrop, business owners and colleagues should achieve a better understanding of people with psychological disorders and should take practical action against ``adverse selection`` for them. The government should implement policies to promote active employment of the mentally incapacitated and to support business owners with practical assistance.
정신적 장애인의 경제수준, 직업능력 및 취업욕구관련 분석
이현경(Hyun-Kyung Lee),박효은(Hyo-Eun Park),최만규(Mankyu Choi) 한국콘텐츠학회 2013 한국콘텐츠학회논문지 Vol.13 No.7
본 연구는 정신적 장애인의 경제수준과 직업능력에 따른 취업욕구를 살펴보고 그에 따른 직업재활 활성화 방안을 제안하고자 하였다. 분석자료는 2008년부터 2010년 까지 장애인 고용패널조사에 3년간 참여한 정신적 장애인 298명(가중빈도적용:154,348명)을 대상으로 하였다. 연구결과, 직업교육 참여희망은 남성일때, 중졸 이상일 때, 자격증을 보유했을 때, 그리고 장애유형중 지적장애일 때 직업교육 참여희망이 높았다. 한편, 취업의사 관련요인은 남성일 때, 가구주일 때, 중등교육 이상 이수하였을 때, 자격증을 보유하고 있을때, 육체활동 능력이 높아질 때, 그리고 장애유형 중 자폐장애일 때 취업의사가 높았다. 이러한 결과를 토대로 정신적 장애인의 경제활동 참여를 높이기 위하여 정신적 장애인의 의사를 반영한 직업재활 서비스제공 및 사업주 주도적 직업활동 등을 제안하였다. The study aimed to figure factors affecting employment needs of people with mental disabilities as the employment needs may differ according to income and occupational ability among people with mental disabilities who are classified economically inactive population. Study subjects included 298 economically inactive populations among registered people with mental disability. And the data from 2008-2010 Panel Data of Employment of Person with Disability were analyzed with logistic regression analysis. The result of the study is as follows. It has been found that interested in vocational education of mentally disabled when the graduated from junior high school, the types of intellectual disability, hope education participation rate was high. And then, Mental disabilities with employment needs, male, head of household, when the graduated from junior high school, when ability to increase physical activity and mental disabilities type of autism spectrum disorder when employment desires were. Based on these results, to increase the economic participation of people with mental disabilities, provide vocational rehabilitation services that reflect the needs of people with mental disabilities and employer-driven professional activity is proposed.