• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 2010년도 하계학술대회
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• pp.321-322
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• 2010

Mobile IPTV lets mobile users transmit and receive multimedia traffic, such as TV signals, audio, text and graphics, through IP-based networks with the support of quality of service(QoS) and quality of experience(QoE), mobility and interactivity [1]. To provide service feasibility, QoS and seamless mobility to mobile users, we consider mobility prediction, link stability, service requirements to develop resource reservation scheme in mobile IPTV environments. Thus, we study for mobility prediction and QoS-guaranteed mobile IPTV service prior to develop the resource reservation scheme.

• International Journal of Internet, Broadcasting and Communication
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• 제11권1호
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• pp.89-96
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• 2019

The purpose of this study is to investigate Nest Labs (Nest)'s business strategy. The activities based on strategic choices for monetizing connected product are investigated. Nest's capacity and functionality is to offer a seamless integration of devices, platforms, and services and the "Works with Nest" offers an ecosystem fulfilling the needs of different partners. For monetizing customer data, Nest provides a seamless customer experience supported by product incentives. Nest introduces open APIs to connect its connected products to the wider Internet of things (IoT) and open to "If This, Then That." The Nest app controls them from one single place. Nest partners with 32 energy providers as of 2017 and they provide energy from renewable and non-renewable energy sources. Nest also creates a sales channels in direct and indirect route and expands is business model to other industries such as home-rental service, 'AirBnB' to help consumers become more energy-efficient at home.

• 유통과학연구
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• 제19권12호
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• pp.23-32
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• 2021

Purpose: By integrating multiple separate online, offline distribution channels, omnichannel distribution has modernized and revolutionized the retailing sector. Omnichannel distribution supports firms by delivering seamless shopping experiences for customers throughout all touchpoints of the shopping journey. This paper aims at exploring the impact of channel integration quality on customer experience and patronage intentions in the omnichannel distribution context. Research design, data and methodology: An online survey was taken with 351 omnichannel experienced shoppers by utilizing the structured questionnaire. The partial least square-structural equation modeling (PLS-SEM) and Smart PLS software were employed to analyze and test proposed hypotheses. Results: The findings reveal that channel integration quality dimensions including breadth of channel-service choice, transparency of channel-service configuration, content consistency, and process consistency, play crucial roles in the customer shopping experience. The perceived compatibility has been influenced by the integrated interactions in which content consistency and process consistency. The findings also demonstrate the positive and direct impact of perceived compatibility on customer experience, and both factors have substantial effects on customers' patronage intentions. Conclusions: This study sheds light on the literature on channel integration quality, omnichannel retailing experience and customer patronage. In addition, this study provides practical implications for omnichannel retailers in enhancing customer experience and patronage.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권9호
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• pp.2118-2135
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• 2012

With the rapid development of heterogeneous emerging wireless technologies and numerous types of mobile devices, the need to support robust mobile video streaming based on the seamless handover in Future Internet is growing. To support the seamless handover, several IP-based mobility management protocols such as Mobile IPv6 (MIPv6), fast handover for the MIPv6 (FMIPv6), Hierarchical MIPv6 (HMIPv6) and Proxy Mobile IPv6 (PMIPv6) were developed. However, MIPv6 depreciates the Quality-of-Service (QoS) and FMIPv6 is not robust for the video services in heterogeneous emerging wireless networks when the Mobile Node (MN) may move to another visited network in contrast with its anticipation. In Future Internet, the possibility of mobile video service failure is more increased because mobile users consisting of multiple wireless network interfaces (WNICs) can frequently change the access networks according to their mobility in heterogeneous wireless access networks such as 3Generation (3G), Wireless Fidelity (Wi-Fi), Worldwide Interoperability for Microwave Access (WiMax) and Bluetooth co-existed. And in this environment, seamless mobility is coupled according to user preferences, enabling mobile users to be "Always Best Connected" (ABC) so that Quality of Experience is optimised and maintained. Even though HMIPv6 and PMIPv6 are proposed for the location management, handover latency enhancement, they still have limit of local mobility region. In this paper, we propose a robust mobile video streaming in Heterogeneous Emerging Wireless Systems. In the proposed scheme, the MN selects the best-according to an appropriate metric-wireless technology for a robust video streaming service among all wireless technologies by reducing the handover latency and initiation time when handover may fail. Through performance evaluation, we show that our scheme provides more robust mechanism than other schemes.

• 한국통신학회논문지
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• 제35권2B호
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• pp.334-344
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• 2010

최근 들어 다양한 휴대 단말과 광대역 무선네트워크의 보급으로 인해 인터넷을 통한 다양한 멀티미디어 스트리밍 서비스에 상당한 관심과 수요가 증가하고 있다. 하지만, 단말 이동시 연속적인 멀티미디어 스트리밍 데이터 전송이 어려운 문제를 가지고 있다. 그래서, 광대역 무선네트워크내 Mobile IPTV 서비스 보급에 있어, 효율적인 무선 자원 활용 및 사용자에게 원활한 QoE (Quality of Experience)를 제공하는 것은 중요한 이슈이다. 본 논문에서는 무선 채널 상태를 인지하여 비디오의 전송률과 품질을 조절하는 네트워크 기반의 품질 적응 스트리밍 기법인 Mobile Adaptive Rate Control (MARC) 기법을 제안한다. 제안하는 기법은 스트리밍 서비스의 품질 향상 이외에도 단말의 이동환경에서 끊김 없는 비디오 재생을 보장 할 수 있도록 무선 채널 상태를 인지하여 현재 무선 채널 및 단말 위치에 적합한 스트리밍 비디오를 전송한다. 제안한 MARC 기법은 광대역 무선 네트워크에서 비디오 재생의 불연속성을 제거하고 안정된 버퍼 할당을 보였다. 시뮬레이션 결과를 통해 제안한 방법의 유효성을 확인하였다.

• 한국멀티미디어학회논문지
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• 제23권10호
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• pp.1258-1269
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• 2020

The IoT(Internet of Things) service provides users with valuable services by collecting and analyzing data using Internet-connected IoT devices. Currently, IoT service platforms are accomplished by using edge computing to reduce the delay time required to collect data from IoT devices. However, if a user moves to another network with IoT device, the connection will be lost and IoT service will be suspended. To solve this problem, we proposes a service that automatically roaming IoT service when IoT device makes move. IoT roaming service provides a device automatic tracking management technique designed to continue receiving IoT services even if users move to other networks. To check if the proposed roaming service was effective, we implemented IoT roaming service and measured the data transfer time while move between networks along with devices while using IoT service. As a result, the average data transfer time was 124.62ms, and the average service interrupt time was 812.12ms. with this result, we can assume that the user could feel service interruption time very shortly and it will not affect the service experience. with IoT roaming service, we expect that it will present a method that stably providing IoT services even if user moves networks.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제3권4호
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• pp.399-422
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• 2009

Although current wireless mesh network (WMN) applications experience a perceptually uninterrupted hand-off, their throughput after the hand-off event may be significantly degraded due to the low available bandwidth of the mobile client's new master. In this paper, we propose a novel mobility management scheme for 802.11-based WMNs that enables both seamless hand-off for transparent communications, and bandwidth awareness for stable application performance after the hand-off process. To facilitate this, we (i) present a new buffer moment in support of the fast Layer-2 hand-off mechanism to cut the packet loss incurred in the hand-off process to zero and (ii) design a dynamic admission control to grant joining accepts to mesh clients. We evaluate the benefits and drawbacks of the proposal for both UDP and TCP traffic, as well as the fairness of the proposal. Our results show that the new scheme can not only minimize hand-off latency, but also maintain the current application rates of roaming users by choosing an appropriate new master for joining.

• 한국병원경영학회지
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• 제26권2호
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• pp.27-42
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• 2021

This study investigated the differences in patient experience by arrangement type of medical tourism facilitators(MTF) from the pre-visit to visit stages. Specifically, patient experiences from each stage with different service providers (MTFs and medical institutions) were measured: provision of information and respect for patient preferences as pre-visit experiences with the facilitators, communication and concierge services as visit experiences with the facilitators, and medical services as medical institution experiences. The scale to measure foreign patients' experiences was modified from the 'Picker in-patient questionnaire(PPE)' and the 'Picker patient experience questionnaire(PPE-15)'. Quantitative data were collected by conducting a self-administered questionnaire on 173 patients from China, Russia, Mongolia, and Kazakhstan. Qualitative data were collected by conducting in-depth interviews with 9 patients and 9 service providers. The data were collected between January and October in 2019. Quantitative data was analyzed by SPSS 25 for Chi-squared test and ANOVA, and qualitative data were analyzed based on keywords. The main results are as follows. When foreign patients used only overseas MTFs, they had a relatively positive patient experience in respect of receiving pre-visit information(F=7.47, p<.01) and respect for patient preferences(F=3.11, p<.05). Looking at both domestic and overseas facilitators during the visit, the patient experience was relatively negative for communication(F=3.75, p<.05). Regarding medical institutions, patients had a relatively negative patient experience with regards to medical services when they used both domestic and overseas facilitators(F=6.49, p<.01). The implications of this study are as follows. Patients should have a seamless and high-quality experience regardless of the facilitator arrangement type. This can be prepared through service standardization for the service providers. It would be also necessary to consider each other's features and problems at the institutional level and to improve service coordination by having service providers periodically communicate with each other.

• 한국컴퓨터정보학회논문지
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• 제20권3호
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• pp.115-124
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• 2015

본 논문에서는 기존 네트워크에서 QoS(Quality of Services) 및 QoE(Quality of Experience)기법들을 분석하고, 재해정보 확산을 위해 끊김없는 N-Screen 서비스들을 제공할 수 있는 고신뢰성 네트워크 시스템 프레임워크 및 그 서비스 전달 기법을 제안한다. N-Screen 서비스에서 콘텐츠 소비자의 만족도, 즉 QoE 는 재해정보 확산에서 중요한 요소가 되고 있으며, 기존 N-Screen 서비스들이 다양한 디바이스들에 정보를 전송하기 위한 기능에 초점을 맞추고 있기 때문이다. 이러한 서비스에 맞춰, 제안된 시스템은 사용자의 서비스 요청을 수용하기 위한 재해정보처리 프레임워크, Push 서비스를 수용할 때 발생하는 패킷의 수를 최소화하기 위한 Push 서비스 모듈, QoE 지표를 최대화 할 수 있는 Push 서비스 컨트롤러로 구성되어 진다. 다양한 스크린(스마트폰, PC, 전광판)에서 끊김없는 N-Screen 서비스를 제공하기 위해 Open API(Application Programming Interfaces) 인터페이스 기능을 가진다. 본 연구의 결과를 통해서 사용자들에게 끊김없는 N-Screen 서비스를 제공하고, Push 컨트롤러 기능 및 효과적인 네트워크 서비스 기능을 제공함으로써 사용자에게 서비스 품질 만족도를 높일 수 있을 것으로 기대된다.

• 한국컴퓨터정보학회논문지
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• 제18권1호
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• pp.31-42
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• 2013

본 연구는 문헌연구를 통해 익스플로라토리움이 개발한 다양한 모바일 디바이스(Electronic Guidebook, Rememberer, I-Guides, eXspot)의 비간섭적 특성에 대해 조명했다. 인터랙티브 전시환경에서 관람객의 몰입경험과 의미 생성을 위해 모바일 디바이스에 필수적으로 요구되는 특성은 전시물과 관람객의 인터랙션에 대한 비간섭적 특성이었다. 모바일 디바이스의 사용성은 비간섭적 특성에 직접적인 영향을 미쳤고, 이로 인해 모바일 디바이스의 형태인자가 교체되었다. 또한 형태인자의 변화는 모바일 디바이스의 기능을 관람 경험에 대한 기억으로 축소시켰다. 또한 모바일 디바이스의 역할이 멀티미디어 가이드에서 관람 후 경험 상기 및 공유 활동을 지원하는 단순한 모바일 도구로 전환됨에 따라 연결완전성이 내재한 관람 모형의 구현이 불가능했다. 익스폴로라토리움이 실행한 일련의 프로젝트는 공통적으로 관람소요시간증가와 관람 후 심화 활동의 활성화 등의 효과를 거두었다. 하지만 박물관학적 관점에서 접근해 보면, 관람소요시간증가는 전시물과의 인터랙션으로 인한 효과가 아니라 관람 기록(MyExploratorium)이 생성되는 사진에 대한 흥미로부터 비롯되었기 때문에 개념적 타당성이 충분하지 않았다. 결론적으로 익스폴로라토리움이 개발했던 모바일 디바이스는 '개인화 기반의 관람경험확장을 최적화하기 위한 하나의 학습지원도구'라고 정의할 수 있다.