• 전기학회논문지
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• 제65권1호
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• pp.122-127
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• 2016

In this paper, new spectrum sensing schemes based on analog/RF front-end processing are introduced for IoT wireless sensor networks. While the conventional approaches for wireless channel cognition have been issued in signal processing area, the RF spectrum cognition concept makes it feasible to achieve cognitive wireless sensor networks (C-WSNs). The spectrum cognition at RF processing is categorized as four kinds of sensing mechanisms. Two recent reseaches are described as promising candidates for the C-WSN. One senses spectrum by the frequency discriminating receiver, the other senses and detects from the frequency selective super-regenerative receiver. The introduced systems with simple and low-power RF architectures play dual roles of channel sensing and demodulation. simultaneously. Therefore, introduced spectrum sensing receivers can be one of the best candidates for IoT wireless sensor devices in C-WSN environments.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권8호
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• pp.2720-2735
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• 2022

This study proposes an internet design framework for users to improve their positive emotions when they are in a negative mood. First, the literature review focuses on the definition of emotion, positive emotional design in internet experiences, and emotion regulation. Second, in order to construct an internet design framework that improves positive emotion, this paper adopts a qualitative analysis method to analyze 70 collected studies in the area of regulating emotion and stimulating positive emotions. Additionally, bibliometrics and statistics are conducted to summarize the framework and strategies. Third, two cases of internet design are presented: (a) Internet design that improves users' positive emotions is examined under the background of extreme rainstorm as an example; an applet service design is provided by case study; (b) in the context of COVID-19, we developed an Internet of things interactive design that improves users' positive emotions. Fourth, the internet design framework and the results of the case studies are analyzed and discussed. Finally, an internet design framework is proposed to improve users' positive emotions when they are in a negative mood, which includes the Detachment-empathy framework, External-protection framework, Ability-strengthen framework, Perspective-transformation framework, and Macro-cognitive framework. The framework can help designers to generate design ideas accurately and quickly when users are in a negative mood, to improve subjective well-being, and contribute to the development of internet experience design.

• 경영정보학연구
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• 제21권3호
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• pp.87-110
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• 2019

핀테크 서비스는 유무선 통신 환경에서 다양한 디바이스를 연결해 금융서비스 이용자들에게 혁신을 제공해 주었다. 본 연구에서는 고전적 태도이론을 이용해 핀테크 서비스 이용자의 심리를 설명하였다. 이 이론적 프레임워크에 기반해, 본 연구에서는 핀테크 서비스 이용자들이 인지하는 혁신성과 상대적 장점이 인지적 반응(인지된 유용성과 이용 용이성)과 감정적 반응(태도)에 미치는 영향관계를 분석하였고, 그리고 태도가 행동 반응(실질이용)에 미치는 영향 관계에 대한 분석하였다. 본 연구에서는 핀테크 서비스 이용 경험 있는 사람들을 대상으로 온라인 설문조사를 수행하였다. 그리고, 수집된 핀테크 서비스 이용자의 데이터를 구조방정식 소프트웨어인 SMART PLS 2.0 M3를 이용해 구조모델을 분석하였다. 실증분석 결과를 살펴보면, 핀테크 서비스 이용자의 혁신성, 상대적 장점, 유용성, 이용 용이성, 태도, 실질이용 사이에는 유의한 인과관계가 존재하는 것으로 나타났다. 이러한 연구결과는 사물인터넷 환경에서 핀테크 서비스 이용자들의 실질이용 증진을 위한 유용한 정보를 제공해 줄 것이다.

• 한국정밀공학회지
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• 제32권1호
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• pp.39-47
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• 2015

Globalization, unpredictable markets, increased products customization and frequent changes in products, production technologies and machining systems have become a complexity in today's manufacturing environment. One key strategy for coping with the evolution of this situation is to develop or apply an enable technology such as intelligent manufacturing. Intelligent manufacturing system (IMS) is characterized by decentralized, distributed, networked compositions of heterogeneous and autonomous systems. The model of IMS is inherited from the organization of the living systems in biology and nature so that the manufacturing system has the advanced characteristics inspired from biology such as self-adaptation, self-diagnosis, and selfhealing. To prove this concept, an innovative system with applying the advanced information and communication technology such as internet of things, cognitive agent are proposed to integrate, organize and allocate the machining resources. Innovative system is essential for modern machining system to flexibly and quickly adapt to new challenges of manufacturing environment.

• 한국멀티미디어학회논문지
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• 제18권9호
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• pp.1091-1097
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• 2015

Internet-of-Things (IoT) becomes one of the most promising future paradigms, which foresees enormous amounts of interoperable things and heterogeneous services. The goal of IoT is to enable all things connected and brings all kinds information and services to people. However, such a great deal of information may lead to cognitive overload or restrain in productivity of people. Thus, it is a necessity to build intelligent mechanisms to assist people in accessing the information or services they needed in a proactive manner. Most of previous related mechanisms are built on well-defined web services and lack of consideration of constrained resources. This paper suggests a services composition method by adapting a hierarchical model, which is a graph-based model composed of four layers: Context Layer, Event Layer, Service Layer and Device Layer. With a such multi-layer graph, service composition can be achieved by the iteration of layer by layer. Then, to evaluate the effectiveness of this proposed hierarchical model, a real-life emergency response dataset is applied and the experimental results are composed with the general probabilistic method and indicate that the proposed method is help for compositing multiple services while considering given context and constrained resources.

• 한국위성정보통신학회논문지
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• 제10권3호
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• pp.1-5
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• 2015

최근 무선 에너지 하비스팅 기술이 센서와 같은 소형 IoT 디바이스들의 크기 제한으로 인한 배터리 부족 문제의 해결방법으로 각광을 받고 있다. 이 기술이 기존의 인지무선 네트워크에 적용된다면 인지 유저들의 운용시간 증가로 인한 네트워크 처리량의 증가를 기대할 수 있다. 본 논문에서는 인지 유저(Cognitive User)가 근처에서 동작 중인 우선 유저(Primary User)의 특정 거리 안에 존재할 때 우선 유저가 전송한 통신 신호로부터 무선 에너지 하비스팅을 하고 특정 거리 밖에 존재할 때 비어있는 채널을 골라 통신을 하도록 한다. 이 때 우선 유저와 인지 유저는 Homogeneous Poisson Pont Process 형태로 분포되어 있고 통신을 하고 있는 수신자들과 일정한 거리로 떨어져있다. 위와 같은 네트워크 모델에서 주어진 여러 가지 조건하에 인지 유저 네트워크 처리량을 최대화할 수 있는 전송파워, 인지 유저 밀도 제안하고 앞으로의 연구방향을 제시한다.

• 경영정보학연구
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• 제18권4호
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• pp.173-187
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• 2016

본 연구는 사물인터넷의 사회적 파급 중 일자리에 미치는 영향을 미래 분석 기법인 시나리오 플래닝을 통해 탐색하였다. 컴퓨팅성능의 기하급수적 발전과 단가 하락에 힘입어 사물인터넷 및 유관 기술의 혁신이 가속화되면서 기존에 인간의 고유한 영역으로 여겨졌던 비정형적, 인지적 영역까지 도전 받게 되었다. 시나리오분석을 통해 미래의 불확실한 경계를 정의, 잠재된 기회와 위협의 영역을 전망함으로써, 주요 의사결정자들에게 사물인터넷의 확장이 기존 일자리 구조에 어떤 영향을 미칠 것인가에 대한 마인드맵(Mind map)을 제공할 수 있을 것으로 기대된다. 또한 시나리오를 통해 전반적으로 기술한 일자리 영향의 정도를 가늠하기 위하여, 국내 고용노동 구조를 살펴보고 52개 중분류 표준직업군별로 향후 감소 또는 성장 가능성이 높은 분야에 대하여 기존 연구 및 시나리오분석을 바탕으로 직종별 전망을 논의한다.

• 한국정밀공학회지
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• 제31권4호
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• pp.287-295
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• 2014

Smart manufacturing (SM) considered as a new trend of modern manufacturing helps to meet objectives associated with the productivity, quality, cost and competiveness. It is characterized by decentralized, distributed, networked compositions of autonomous systems. The model of SM is inherited from the organization of the living systems in biology and nature such as ant colony, school of fish, bee's foraging behaviors, and so on. In which, the resources of the manufacturing system are considered as biological organisms, which are autonomous entities so that the manufacturing system has the advanced characteristics inspired from biology such as self-adaptation, self-diagnosis, and self-healing. To prove this concept, a cloud machining system is considered as research object in which internet of things and cloud computing are used to integrate, organize and allocate the machining resources. Artificial life tools are used for cooperation among autonomous elements in the cloud machining system.

• 한국컴퓨터정보학회논문지
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• 제24권12호
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• pp.119-126
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• 2019

출산율 저하와 평균수명 연장 등으로 빠르게 고령화 사회가 되고 있는 우리나라는, 노인 질환 또한 큰 문제가 되고 있다. 그 중 관리가 어렵고 많은 사회적 비용을 필요로 하는 치매 환자의 수가 빠르게 증가하고 있으나, 인식 부족, 전문 인력의 부족 등으로 인해 치매의 국가적 관리와 사회적 부담이 큰 이슈가 되고 있다. 이에, 치매의 전단계인 경도인지장애를 효율적으로 선별하는 기기를 개발하였다. 기기 개발을 위해 최신 IoT 기술을 활용하였고, 최적화된 K-HDS를 도입하였으며, 편리한 사용방식과 친화적인 디자인을 적용하였다. 그 결과, 거부감 없고 손쉬운 동작으로 빠르고 편리하게 경도인지장애 등의 증상을 선별할 수 있었다. 이 기기를 활용하면, 경도인지장애 또는 치매의 초기 단계로 의심되는 증상을 효율적으로 선별하여 조기에 치매를 예방하고, 보다 건강한 사회를 만들 수 있을 것이다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권2호
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• pp.618-633
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• 2014

Relay technology is becoming more important for mobile communications and wireless internet of things (IoT) networking because of the extended access network coverage range and reliable quality of service (QoS) it can provide at low power consumption levels. Existing mobile multihop relay (MMR) technology uses fixed-point stationary relay stations (RSs) and a divided time-frame (or frequency-band) to support the relay operation. This approach has limitations when a local fixed-point stationary RS does not exist. In addition, since the time-frame (or frequency-band) channel resources are pre-divided for the relay operation, there is no way to achieve high channel utilization using intelligent opportunistic techniques. In this paper, a different approach is considered, where the use of mobile/IoT devices as RSs is considered. In applications that use mobile/IoT devices as relay systems, due to the very limited battery energy of a mobile/IoT device and unequal channel conditions to and from the RS, both minimum energy consumption and QoS support must be considered simultaneously in the selection and configuration of RSs. Therefore, in this paper, a mobile RS is selected and configured with the objective of minimizing power consumption while satisfying end-to-end data rate and bit error rate (BER) requirements. For the RS, both downlink (DL) to the destination system (DS) (i.e., IoT device or user equipment (UE)) and uplink (UL) to the base station (BS) need to be adaptively configured (using adaptive modulation and power control) to minimize power consumption while satisfying the end-to-end QoS constraints. This paper proposes a minimum transmission power consuming RS selection and configuration (MPRSC) scheme, where the RS uses cognitive radio (CR) sub-channels when communicating with the DS, and therefore the scheme is named MPRSC-CR. The proposed MPRSC-CR scheme is activated when a DS moves out of the BS's QoS supportive coverage range. In this case, data transmissions between the RS and BS use the assigned primary channel that the DS had been using, and data transmissions between the RS and DS use CR sub-channels. The simulation results demonstrate that the proposed MPRSC-CR scheme extends the coverage range of the BS and minimizes the power consumption of the RS through optimal selection and configuration of a RS.