• 한국정보시스템학회:학술대회논문집
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• 한국정보시스템학회 2005년도 추계학술대회 발표 논문집
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• pp.359-366
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• 2005

As the ubiquitous computing technology (uT) is prevailing, applying uT is more likely to transform the legacy way of doing business to a new way with the goals of ubiquitous computing: strategic use of information resources by using them everywhere, every time, with any devices for any services. These opportunities naturally require the provision to assess the degree of the transformation from the legacy IT-based e-business to the uT-based business. However, research about assessing the degree of u-transformation has been still very few. Moreover, even deciding what is ubiquitous or not is obscure. Hence, this paper aims to propose the methodology for assessing the degree of u-transformation oriented by the teleology of ubiquitous service, which intends to fully make use of uT in creating new business of next generation. Through the literature review, we developed the methodology to check whether the provided service is ubiquitous or not based on the capabilities that technologies have. and then, the methodology developed to assess the technical requirements that the uT should have when the transformation is considered through the focus group interview based on the literature review of the capability. A two-layered approach is introduced to assess not only the level of ubiquity but also the degree of u-transformation.

• 경영정보학연구
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• 제8권1호
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• pp.43-61
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• 2006

향후 전자시장에서 운영될 유비쿼터스 서비스의 상용화를 위해서 유비쿼터스 컴퓨팅 서비스를 평가하는 것은 매우 중요한 이슈로 대두된다. 그러나 유비쿼터스 컴퓨팅 서비스에 대한 평가의 중요성과 유용성에도 불구하고, 유비쿼터스 컴퓨팅 서비스의 평가는 아주 초기단계에 머물러 있다. 더우기, 무엇이 '유비쿼터스 컴퓨팅 서비스'인지의 기준에 대한 연구도 충분히 이루어지지 않은 실정이다. 따라서, 본 논문에서는 유비쿼터스 컴퓨팅 서비스를 평가하는 통합 방법론을 제공하는 것을 목적으로 한다. 다계층 접근법은 기술적 관점 뿐만 아니라 행태적인 관점도 동시에 포함하고 있다. 평가 모델의 실행 가능성을 보이기 위해, 3가지의 사용 예를 연구하고 평가하였다.

• 한국정보통신학회논문지
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• 제13권8호
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• pp.1571-1579
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• 2009

본 논문은 유비쿼터스 인터넷 환경에서 다양한 개인 IPTV 응용 서비스를 제공할 수 있도록 QoS 요구사항을 제어 할 수 있는 P2P(Peer-to-Peer) 스트리밍 프로토콜을 제시한다. 본 논문에서 제시된 P2P 스트리밍 프로토콜은 IPTV의 비디오 스트리밍 채널에 대해 짧은 초기 지연시간(startup delay)을 제공하고, 참여자에 대한 종단간 지연시간(end-to-end delay)과 대역폭(bandwidth)을 보장하며, 응용 서비스에 적합한 신뢰 수준(reliability level)을 설정할 수 있게 한다. QoS 기반의 P2P 스트리밍 프로토콜은 P2P 스트리밍의 확장성(scalability), 가용성(availability), 그리고 편재성(ubiquity)의 장점을 살리면서 성능(performance)과 신뢰성(reliability) 측면의 단점을 적절하게 보완함으로써 기존 광대역 인터넷 환경에서 다양한 유형의 실시간 개인 IPTV 채널 구현할 수 있게 한다.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2005년도 춘계학술대회
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• pp.121-130
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• 2005

The evaluation of ubiquitous computing service is the important work for preparing the commercialization of the ubiquitous business services in which ubiquitous intelligence (ubitelligence) is embedded. However, the methodology for evaluating ubiquitous computing services has not been developed enough. Even the study of making a distinction what is 'ubiquitous' or not is insufficient yet. Hence, this paper aims to propose an integrated methodology to assess the ubiquitous computing services. A multi-layered approach is adopted to assess not only technical but also behavioral service levels.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2005년도 공동추계학술대회
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• pp.147-156
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• 2005

In developing the ubiquitous computing technology based services (ubiquitous services), evaluating how much value of those services is created or added is very crucial. The efforts to evaluate the ubiquitous services have been progressed in two perspectives - technical perspective and behavioral perspective. Despite its importance, however, the methodologies which integrate both perspectives have been still very rare. Hence, this paper aims perspectives have been still very rare. Hence, this paper aims to propose an integrated ubiquitous service valuation methodology based on the multi-layered approach including technical and behavioral perspectives. To do so, we conducted a case study with currently existing location based service (LBS) such as navigation systems by conducting focus group interview (FGI) and field survey.

• International Journal of Computer Science & Network Security
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• 제23권5호
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• pp.163-171
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• 2023

The intelligent transportation system has made a huge leap in the level of human services, which has had a positive impact on the quality of life of users. On the other hand, these services are becoming a new source of risk due to the use of data collected from vehicles, on which intelligent systems rely to create automatic contextual adaptation. Most of the popular privacy protection methods, such as Dummy and obfuscation, cannot be used with many services because of their impact on the accuracy of the service provided itself, they depend on changing the number of vehicles or their physical locations. This research presents a new approach based on the shuffling Nicknames of vehicles. It fully maintains the quality of the service and prevents tracking users permanently, penetrating their privacy, revealing their whereabouts, or discovering additional details about the nature of their behavior and movements. Our approach is based on creating a central Nicknames Pool in the cloud as well as distributed subpools in fog nodes to avoid intelligent delays and overloading of the central architecture. Finally, we will prove by simulation and discussion by examples the superiority of the proposed approach and its ability to adapt to new services and provide an effective level of protection. In the comparison, we will rely on the wellknown privacy criteria: Entropy, Ubiquity, and Performance.

• 센서학회지
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• 제25권2호
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• pp.131-137
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• 2016

In this study, a multilevel visible light communication (VLC) system based on resistor ladder circuit is designed to transmit medical data. VLC technology is being considered as an alternative wireless communication due to various advantages such as ubiquity, license free operation, low energy consumption, and no radio frequency (RF) radiation characteristics. With VLC even in places where traditional RF communication (e.g., Wi-Fi) is forbidden, significant bio-medical signal including the electrocardiography (ECG) and photoplethysmography (PPG) data can be transmitted. More lives could be saved anywhere by this potential advantage of VLC with a fast emergency response time. A multilevel transmission scheme is adopted to improve the data capacity with keeping simplicity, where data transmission rate can increase by log2m times (m is the number of voltage levels) than that of conventional VLC transmission based on on/off keying. In order to generate multi-amplitudes, resistor ladder circuit, which is a basic principle of digital to analog convertor, is employed, and information is transferred through LED (Light-Emitting Diode) with different voltage level. In the receiver side, multilevel signal is detected by optical receiver including a photo diode. Then, the collected data are analyzed to serve the necessary medical care to the concerned patient.

• Journal of Microbiology and Biotechnology
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• 제33권3호
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• pp.277-287
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• 2023

Since the first discovery of antibiotics, introduction of new antibiotics has been coupled with the occurrence of antibiotic resistant bacteria (ARB) and antibiotic resistance genes (ARGs). Rapid dissemination of ARB and ARGs in the aquatic environments has become a global concern. ARB and ARGs have been already disseminated in the aquatic environments via various routes. Main hosts of most of ARGs were found to belong to Gammaproteobacteria class, including clinically important potential pathogens. Transmission of ARGs also occurs by horizontal gene transfer (HGT) mechanisms between bacterial strains in the aquatic environments, resulting in ubiquity of ARGs. Thus, a few of ARGs and MGEs (e.g., strA, sul1, int1) have been suggested as indicators for global comparability of contamination level in the aquatic environments. With ARB and ARGs contamination, the occurrence of critical pathogens has been globally issued due to their widespread in the aquatic environments. Thus, active surveillance systems have been launched worldwide. In this review, we described advancement of methodologies for ARGs detection, and occurrence of ARB and ARGs and their dissemination in the aquatic environments. Even though numerous studies have been conducted for ARB and ARGs, there is still no clear strategy to tackle antibiotic resistance (AR) in the aquatic environments. At least, for consistent surveillance, a strict framework should be established for further research in the aquatic environments.

• 대한인간공학회지
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• 제31권1호
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• pp.63-76
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• 2012

Objective: The main objective of this study is to propose a user-centered assessment metric for ubiquitous services. Background: As the ubiquitous era took off, the interactions between ubiquitous services and users have come to take an important position. It is essential to conceptualize a new assessment model that considers human-system interaction capability with a user-centered design perspective. Method: The evaluation model for the interactivity of ubiquitous service was approached from the concept of usability and inter-personality of services. As a validation study, suggested assessment metric was utilized to evaluate the u-Home service. Priority weighting of each assessment metric was derived using the quantification type-I analysis. Results: To evaluate interactivity, this study suggested a quantitative metric for user testing performed after classifying the interactivity characteristics to contextualization; ubiquity; user experience; and service capability. Conclusion: This study suggest the metric for the ubiquitous service that are experienced in real life, and introduced the concept of ubiquitous service interactivity. Application: The suggested evaluation metric can be used to evaluate interactivity level of ubiquitous service and identify the potential problem and usability requirements at the early stage of service development.

• 사물인터넷융복합논문지
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• 제7권3호
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• pp.81-90
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• 2021

본 연구에서는 블록체인 기반 금융 플랫폼의 이용자 특성과 기술적 특성이 금융 소비자의 사용 의도에 미치는 영향을 분석하였다. 또한 이러한 영향 관계에서 상대적 이점과 인지된 위험이 사용 의도에 어떠한 인과 관계가 있는지를 분석하였다. 2021년 6월 1일부터 7월 30일까지 블록체인 기술이 접목된 금융 플랫폼을 사용한 경험이 있는 대상자를 표본으로 비대면 자기기입식 온라인 설문조사를 실시하였고, 187부로 연구를 진행하였다. 통계처리는 SPSS 21.0 프로그램을 이용하여 빈도 분석, 탐색적 요인 분석, 신뢰도 분석, 상관관계 분석, 다중 회귀분석, 3단계 매개 회귀분석을 실시하였다. 통계값의 유의 수준은 95% 미만으로 하였다. 연구 결과는 다음과 같다. 첫째, 이용자 특성에서 혁신성과 유용성이 사용 의도에 영향을 미치는 것으로 나타났다. 둘째, 기술적 특성에서 적합성과 신뢰성이 사용 의도에 영향을 미치는 것으로 나타났다. 셋째, 이용자 특성과 사용 의도의 관계에서 상대적 이점과 인지된 위험은 부분매개 역할을 하는 것으로 나타났다. 넷째, 기술적 특성과 사용 의도의 관계에서 상대적 이점과 인지된 위험은 부분매개 역할을 하는 것으로 나타났다. 다섯째, 인증서 사용 경험에 따라 이용자 특성의 편재성, 기술적 특성의 적합성, 사용 의도에서 차이가 있는 것으로 나타났다. 이러한 연구의 결과가 사물인터넷을 기반으로 한 금융 플랫폼 발전에 기여할 수 있을 것이다.