• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.6 no.4
• /
• pp.552-558
• /
• 2002

Differentiated services (DiffServ) architecture defines a new framework for the support of quality of service (QoS) in IP-based networks. RIO has received the most attention among all the active queue management mechanisms proposed for assured service in DiffServ environment. The paper proposed the enhanced RIO which could alleviate the impact of flow's packet sire on the realized throughput. The simulation results indicate that this mechanism, when combined with TSW as traffic conditioner, provide better throughput assurance and fair distribution of excess bandwidth independent of packet size of flows in case of well-provisioned network environment.

• Electronics and Telecommunications Trends
• /
• v.25 no.3
• /
• pp.18-27
• /
• 2010

국내외에서 아이폰, 안드로이드폰 등과 같은 스마트폰으로 촉발된 모바일 혁명의 시대에서도 사용자들이 가장 많이 사용할 것으로 예상되는 모바일 검색(mobile search) 기술에 대해 설명하고자 한다. 모바일 환경에 특화된 검색 서비스를 제공하기 위한 기술에 대해 소개하고, 현재 이슈가 되고 있는 관련 기술 동향을 분석한다. 모바일 검색이 갖는 특징과 유선 인터넷 환경의 검색과의 차별점에 대해 알아보고, 이러한 차별점을 부각시킬 수 있는 기술에 대해 설명한다. 구글 야후 MS를 포함한 국외 검색 서비스 사업자와 네이버, 다음 등 국내 포털의 모바일 검색 관련 서비스에 대해 소개한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.07a
• /
• pp.556-558
• /
• 2005

대용량의 고속 멀티미디어 데이터 전송 서비스, 주문형비디오 (VoD)와 같이 네트워크 어플리케이션 서비스를 포함하는 서비스들은 높은 대역폭을 요구한다. 이로 인하여, 네트워크에서 혼잡이 일어날 가능성이 증가된다. 네트워크의 혼잡을 피하기 위해서는 물리적인 방법과 논리적인 방법으로 나눌 수 있다. 물리적인 방법은 시간과 고성능의 장비를 필요로 하기 때문에 논리적인 방법으로 제한적인 네트워크의 자원을 효율적으로 사용할 필요성이 있다. 본 논문에서는 멀티미디어 데이터 QoS를 보장하기 위해 트래픽의 특성을 고려하는 차별적인 큐 관리 적용 방안을 제시하고, OPNET을 사용하여 이를 검증한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2006.10d
• /
• pp.441-444
• /
• 2006

통신기술의 급격한 발전, 유비쿼터스에 대한 시장수요 증가, 신규 시장창출을 위한 비즈니스 전략이 결집되어 유무선 융합의 패러다임이 전개되고 있으며 유선의 전송속도와 무선의 이동성을 결합한 와이브로는 유무선 융합을 주도할 서비스로 부각되고 있다. 2006년 상반기에 상용화 될 예정인 와이브로가 안정적인 가입자 기반으로 조기에 시장확산을 이루기 위해서는 동시기에 출시될 HSDPA에 비하여 차별적 지위를 확보하고 기존 서비스와의 관계를 정립하기 위한 포지셔닝 전략이 요구된다. 이에 본 연구에서는 소비자 설문조사를 통해 와이브로의 시장수요를 HSDPA와의 관계 분석을 바탕으로 전망하며 기존 서비스와의 대체 또는 보완 관계를 파악하여 와이브로의 시장위상을 예측하였다. 분석결과 첫째, 잠재적 이용자가 인식하는 와이브로의 서비스 역량은 HSDPA에 비하여 전송속도와 이용요금에서 차별적 우위를 나타냈으며 둘째, 와이브로는 HSDPA에 비하여 가입자 규모에서 상대적인 우위를 보였으며 두 서비스의 가입 영향요인은 상이하였다. 마지막으로 와이브로는 초고속인터넷과는 보완 관계를, 이동전화 무선인터넷과 공중 무선랜과는 대체 관계를 형성하는 것으로 나타났다.

• Korean Journal of Social Welfare
• /
• v.67 no.4
• /
• pp.227-249
• /
• 2015

The purpose of this study was to explore the meaning of work between Asian Americans and white Americans living with mental illness. Employment is important for recovery of Asian Americans with mental illness. However, little is known about reasons of low participation and completion rates on recovery and employment services for Asian Americans with mental illness. Although few studies have suggested that exploring cultural difference is a key to understand these issues, no study have explored how their culture influences a viewpoint on work. Therefore, a study to explore the meaning of work and influences of culture on work is required. This study used both quantitative and qualitative methods. An Internet version of world of work survey was developed based on results of study by Millner(2015) and cognitive interview. The survey was conducted from May to August 2015 and 91 people living with mental illness completed the survey. T-test was used for analyzing qualitative data and researchers analyzed qualitative data. Asian Americans showed higher preference for employment and have more difficulty at workplace and in receiving recovery and vocational services. The findings from this study can inform the development of recovery-oriented employment for people living with mental illness from diverse ethnic groups.

• The Journal of the Korea Contents Association
• /
• v.15 no.10
• /
• pp.193-204
• /
• 2015

This study investigated how the ageism of geriatric care helpers influenced on elder abuse during their long-term care service for elderly, and analyzed the mediating effects of counselling from public organizations on the causal relationship between ageism and elder abuse. The data used in this study was collected from 627 of care helpers working at elderly long-term care institutions in Gyeongsangnam-do Province, using structured survey(or questionnaire), and analyzed by Baron and Kenny(1986)'s multiple regression method. Ageism has a meaningful influence on elder abuse and counselling from public organizations has meaningful mediating effect on the relationship between ageism and elder abuse. These results show that elder abuse according to ageism can be improved by counselling from public organizations and It presents some practical implications for ageism and counselling from public organizations.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2003.05a
• /
• pp.169-173
• /
• 2003

고객만족도는 고객의 충성도, 이탈률, 재구매율, 신규고객창출 등과 밀접한 관계를 맺고 있으며, 기업성과측정모형인 BSC(Balanced Scorecard)의 4가지 평가관점 중에도 고객관점이 포함되어있다. 이처럼 중요한 의미를 갖는 고객만족도의 기존 모형들은 일반적인 평가모형으로 업종별 차별성인 없고, 새롭게 등장한 모바일 서비스의 특성을 반영한 고객만족도 평가를 수행하기에 한계가 있다. 본 연구는 기존의 모바일 서비스 관련 연구와 고객만족도 평가 관련 연구들을 고찰하고, 이를 바탕으로 모바일 서비스 분류체계와 모바일 서비스에 특화된 고객만족도 평가체계를 제시한다.

• Journal of Convergence for Information Technology
• /
• v.7 no.4
• /
• pp.1-9
• /
• 2017

The purpose of this study, is to identify the factors affecting reuse intention, determine the accurate demand of suppliers and consumers for qualitative dental care service, and identify the cyclic factors positively affecting one another. The data were analyzed by SPSSWIN 18.0, t-test and one way ANOVA, Pearson correlation and Stepwise multiple regression. Human service quality was significantly positively correlated with service value (r=0.609) and reuse intention (r=0.627) and service value was significantly positively correlated with reuse intention (r=0.645). The higher service value, the higher human service quality, the lower medical service discrimination, the higher level of reuse intention, which accounted for 56.9%. Therefore, it is necessary to make optimal maintenance of the system from the broad viewpoint of dental care in general and apply it in practice by developing good methods steadily.

• Journal of the Korean Geographical Society
• /
• v.38 no.3
• /
• pp.444-462
• /
• 2003

There has been emerging general agreement on the relative importance of producer services in a economy. This research describes the spatial patterns and trends in producer services at different spatial scales. The other research aim is to explain the impacts of producer services on spatial changes at the national level and at the intra-metropolitan level in Seoul. Producer services have highly concentrated in metropolises, especially Seoul. Between 1986 to 2001, an important spatial change in the producer services at the national level has been their growth in the Capital Region, reinforcing the role and function of Seoul. This reinforced role of Seoul is closely related to its competitive advantages arising from economies of urban. There have been some dramatic changes in the location of producer services within Seoul. The most important change was the growth of the Youngdong area, previously a sub-center for businesses, as the most important location for producer services, exceeding the previous dominant role of the CBD area. The changing urban form of Seoul is partly related to the onset of some diseconomies of urbanization in the CBD, while at the same time Youngdong has reached a stage at which it is benefiting from the agglomeration of a variety of firms, in addition to a favourable social and physical infrastructure.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.40 no.12
• /
• pp.83-93
• /
• 2003

Differentiated service networks, based on bandwidth broker, perform the control and management of QoS provisioning for the QoS guaranteed services, However, the centralized bandwidth broker model has a scalability problem since it has centralized resource management for the admission control function of all call attempts, Therefore, in this paper, we proposea novel adaptive admission control mechanism according to the attempted call status for enhancing the scalability under the centralized bandwidth broker model in IP differentiated service networks, The proposed mechanism decouples the function of admission control from the bandwidth broker, So, the ingress edge node performs the admission control and the bandwidth broker performs the resource management and QoS provisioning, We also introduce an edge-to-edge path concepts and the ingress edge node performs the admission control under the allocated bandwidth to eachpath. The allocated bandwidth per path adaptively varies according to the status of the attempted calls, This mechanism can significantly reduce the number of communication message between the bandwidth broker and each edge node in the network and increase the bandwidth utilization via adaptable resource allocation, In this paper we study the adaptive admission control operation and show the efficient and extensive improvement through the performance evaluation.