• Journal of Information Processing Systems
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• 제16권3호
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• pp.733-741
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• 2020

A smart dust monitoring system is useful for obtaining information on rough terrain that is difficult for humans to access. One of ways to deploy sensors to gather information in smart dust environment is to use an aircraft in the Amazon rainforest to scatter an enormous amount of small and cheap sensors (or smart dust devices), or to use an unmanned spacecraft to throw the sensors on the moon's surface. However, scattering an enormous amount of smart dust devices creates the difficulty of managing such devices as they can be scattered into inaccessible areas, and also causes problems such as bottlenecks, device failure, and high/low density of devices. Of the various problems that may occur in the smart dust environment, this paper is focused on solving the bottleneck problem. To address this, we propose and construct a three-layered hierarchical smart dust monitoring system that includes relay dust devices (RDDs). An RDD is a smart dust device with relatively higher computing/communicating power than a normal smart dust device. RDDs play a crucial role in reducing traffic load for the system. To validate the proposed system, we use climate data obtained from authorized portals to compare the system with other systems (i.e., non-hierarchical system and simple hierarchical system). Through this comparison, we determined that the transmission processing time is reduced by 49%-50% compared to other systems, and the maximum number of connectable devices can be increased by 16-32 times without compromising the system's operations.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.873-875
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• 2014

본 논문에서는 스마트 디바이스의 MAC address를 이용한 bluetooth 기반의 건물 출입통제 시스템을 제안한다. 제안하는 출입통제 시스템은 서버에 등록된 MAC address와 출입자의 스마트 디바이스 MAC address를 비교하여 일치 여부에 따라 출입통제가 이루어진다. 실험 결과, 스마트 디바이스와 bluetooth 모듈의 bluetooth 페어링만으로 출입문의 통제가 가능하기 때문에 별도의 출입 도구가 필요하지 않고, 출입 승인을 위한 행동이 생략됨에 따라 기존 출입통제 시스템에 비해 출입 승인절차가 간소화되어 편의성을 향상시킬 수 있다.

• 센서학회지
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• 제26권5호
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• pp.301-305
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• 2017

This paper presents a wearable human health-monitoring band. The band consists of a body temperature detector (BTD) and a hear rate detector (HRD). The BTD and HRD are realized using an inkjet-printed flexible temperature sensor and a commercial heart rate sensor module, respectively. The sensitivity of the fabricated BTD was found to be $-31/^{\circ}C$ with a linearity of 99.82%. The HRD using the commercial heart rate sensor module has a good performance with a standard deviation of 0.85 between the data of a commercial smart watch and the fabricated HRD.

• 한국의류산업학회지
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• 제9권3호
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• pp.327-335
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• 2007

As the digital environment gets ubiquitous, domestic and international research and development on smart clothing is being conducted actively these days. However, most research is being carried out with its center on upper garment. So research on lower garment is insufficient even though it affects wearer's activity and comfort to a great extent when digital devices are attached or wearers moves their body. Therefore, the type of clothes this research proposes is men's formal pants which have an electrically-vibrating wearable device. These are smart pants which are helpful in easing muscle pain with their massaging effect in daily life. For this purpose, this research intends to develop patterns considering the body shapes and movements of wearers and suggest a tentative structure plan for smart pants where a vibration device is attached, which is mainly composed of vibrating motor, controller, and switch, and considered their bulks, numbers, attaching places.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권8호
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• pp.3090-3102
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• 2015

The accuracy of an augmented reality (AR) application is highly dependent on the resolution of the object's image and the device's computational processing capability. Naturally, a mobile smart device equipped with a high-resolution camera becomes the best platform for portable AR services. AR applications require significant energy consumption and very fast response time, which are big burdens to the smart device. However, there are very few ways to overcome these burdens. Computation offloading via mobile cloud computing has the potential to provide energy savings and enhance the performance of applications executed on smart devices. Therefore, in this paper, adaptive mobile computation offloading of mobile AR applications is considered in order to determine optimal offloading points that satisfy the required quality of experience (QoE) while consuming minimum energy of the smart device. AR feature extraction based on SURF algorithm is partitioned into sub-stages in order to determine the optimal AR cloud computational offloading point based on conditions of the smart device, wireless and wired networks, and AR service cloud servers. Tradeoffs in energy savings and processing time are explored also taking network congestion and server load conditions into account.

• 한국산업정보학회논문지
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• 제18권6호
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• pp.51-59
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• 2013

스마트 디바이스는 개인 장비이고 내장된 센서들을 사용할 수 있는 능력을 갖고 있다. 따라서 센서 정보를 통해 사용자의 상황을 인지하여 맞춤화된 서비스를 제공하는 것이 가능하다. 이러한 맞춤화된 서비스를 위해 사용자의 이동 상황은 많은 영역에서 활용이 될 수 있는 중요한 정보이다. 기존의 사용자의 이동 상황을 결정에 관한 연구들은 스마트 디바이스가 가방이나 주머니에 있다고 가정하였기 때문에 사용자가 스마트 디바이스를 사용하고 있는 경우에는 사용자의 이동 상황을 정확하게 결정하는데 적합하지 않다. 본 논문에서는 이러한 문제를 해결하기 위한 사용자의 스마트 디바이스 사용과 이동 상황을 판별하는 알고리즘을 제안한다. 제안한 알고리즘은 스마트 디바이스의 이벤트를 활용하여 사용자의 스마트 디바이스 사용 여부를 판단하고 가속도 센서 데이터를 통해 사용자의 이동 상황을 판별한다. 실제 실험을 통해 분석한 결과 평균 약 75%정도의 정확도를 보였다.

• 산경연구논집
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• 제10권2호
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• pp.17-23
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• 2019

Purpose - This study aims to clarify the impact of smart health gadgets (specfically, smart watches/sports wristbands) on promoting healthy behavior. It also aims to understand the use and characteristics of the devices, to explore the relationship between device factors and factors that affect healthy behavior, and to discuss the development of health promotion. Research, design, data, and methodology - Smart device users were investigated through a random sampling method of 185 respondents, including all ages and all levels of occupation, education, and income. The SmartPLS 3.0 software enabled the path analysis and the descriptive statistical analysis; the theoretical model was evaluated for the parameter analysis. Results - The size and path of each factor impacting health promoting behavior were ascertained. The objective factors that attract users to the smart wristband were investigated as well as the methods by which the device and the HPM are bound to each other and the correlation factors to seek out the closest relationship. Conclusions - According to the analysis, the real-time smart watch/sports wristband exerts a positive impact on one's health promoting behavior. Health awareness is increasingly promoted in the process of using the device, and the impact of health awareness and self-efficacy effects on healthy behavior is considerable.

• 디지털산업정보학회논문지
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• 제14권3호
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• pp.11-20
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• 2018

Smart devices refer to various devices and control equipment such as health care devices, imaging devices, motor devices and wearable devices that use wireless network communication (e.g., Wi-fi, Bluetooth, LTE). Commercial services using such devices are found in a wide range of fields, including home networks, health care and medical services, entertainment and toys. Studies on smart devices have also been actively undertaken by academia and industry alike, as the penetration rate of smartphones grew and the technological progress made with the fourth industrial revolution bring about great convenience for users. While services offered through smart devices come with convenience, there is also various security threats that can lead to financial loss or even a loss of life in the case of terrorist attacks. As attacks that are committed through smart devices tend to pick up where attacks based on wireless internet left off, more research is needed on related security topics. As such, this paper seeks to design an access control method for reinforced security for smart devices. After registering and authenticating the smart device from the user's smart phone and service provider, a safe communication protocol is designed. Then to secure the integrity and confidentiality of the communication data, a management process such as for device renewal or cancellation is designed. Safety and security of the existing systems against attacks are also evaluated. In doing so, an improved efficiency by approximately 44% compared to the encryption processing speed of the existing system was verified.

• 한국인터넷방송통신학회논문지
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• 제20권4호
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• pp.149-154
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• 2020

본 연구에서는 블루투스를 이용하여 스마트폰 으로 제어되는 Smart Diffuser 디바이스의 초기모델을 개발하였다. Smart Diffuser는 디바이스에 주입하는 오일을 분사시키기 위해 초음파 진동자를 이용하였다. 고휘도 LED를 사용하여 오일이 분사되는 동안에 색상 변화가 보여 지도록 디바이스를 개발하였다. 휴대용 디바이스인 점을 감안하여 충전 시간 문제를 해결하기 위해 40mAh의 Li-Po 배터리를 사용하여 장시간 사용할 수 있도록 설계를 하였다. Bluetooth Low Energy를 이용하여 저전력 구동을 구현을 함으로서 초기 설계모델의 유용성에 대해 확인 하였다.

• 한국콘텐츠학회논문지
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• 제15권2호
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• pp.507-519
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• 2015

본 연구에서는 스마트폰, 태블릿 PC를 활용한 스마트러닝 환경에서 기기의 유형 및 모달리티(modality)가 학습자의 주관적인 상호작용경험에 미치는 영향을 실험연구를 통해 검증하였다. 분석 결과, 모달리티는 사회적 실재감 및 학습자의 상호작용경험(상호작용경험 평가, 다른 학습자에 대한 태도)에 유의미하게 긍정적인 영향을 미치는 것으로 나타났다. 스마트 기기 유형의 경우 사회적 실재감 및 학습자의 상호작용경험에 직접적으로 미치는 영향은 없었으나, 모달리티가 사회적 실재감 및 학습자의 상호작용경험에 영향을 미칠 때 조절변인으로서 상호작용효과를 가지는 것으로 나타났다. 이러한 연구 결과는 다양한 기기를 활용한 스마트러닝 환경에서 사회적 실재감 및 학습자 간 상호작용을 증진시킬 수 있는 학습 환경의 설계 원리를 제시한다는 측면에서 시사점을 가진다.