• Information Systems Review
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• v.15 no.3
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• pp.129-139
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• 2013

The Internet of Things (or IoT for short) which refers to uniquely identifiable objects and their virtual representations in an Internet-like structure is to be reality today. The amount of data on IoT is expected to increase abruptly and there are several key issues like usefulness interoperability between multiple distributes systems, services and databases. In this paper a methodology is proposed to realize a recently developed cloud service model, Contents as a Service (CaaS), which is contents delivery model referred to as 'on-demand contents'. In the proposed method, the global object identification, ePosition, comprising the structured form of two sorts of text strings with a separation symbol like # is applied to identify a specific content and registered with the content at the same server. It is easy-to-realize and effective to solve the interoperability problem systematically and logically. Some APIs for the proposed CaaS service are to be converged to provide some upgraded cloud service model such as 'CaaS supported SaaS' and 'CaaS supported PaaS'.

• Journal of Digital Convergence
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• v.12 no.6
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• pp.333-339
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• 2014

In the late 2000's, a smart phone caused by the digital revolution has led to abrupt changes from our life. The internet of thing (IoT), which is considered as a next digital revolution, will be scrutinized in this paper. Students, who use smart phones in Silla University, were selected for the sample-frame. Approximately 78% students replied with a positive response to the digital revolution admit the new era with the intellectual curiosity and challenge. On the other hand, about 48% students showed uneasy response to the new civilization due to the lack of privacy and security issues of IoT; furthermore, friendship was their apprehension. This paper will provide potentially useful insights and directions for examining factors that affect different manners toward the next digital revolution.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.05a
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• pp.724-727
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• 2014

This paper is analyzing the situation of the Internet of Things Industry and draw the policy implications to promote Internet of Things industry. Major IT companies as Apple, Google, IBM, Sony, and Samsung have developed various smart glass and smart watch as a Iot products. In order to promote Iot Industry, we should take the build up of eco system between IT makers and the various contents provider, protection of personal information and data, development of killer applications and business models, and the conversion from IPv4 to IPv6 as a next internet address infra, build up of international standard platform on IoT.

• IEMEK Journal of Embedded Systems and Applications
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• v.11 no.2
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• pp.97-105
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• 2016

Microcontrollers (MCUs) for endpoint smart sensor devices of internet-of-thing (IoT) are being implemented as system-on-chip (SoC) with on-chip instruction flash memory, in which user firmware is embedded. MCUs directly fetch binary code-based instructions through bit-line sense amplifier (S/A) integrated with on-chip flash memory. The S/A compares bit cell current with reference current to identify which data are programmed. The S/A in reading '0' (erased) cell data consumes a large sink current, which is greater than off-current for '1' (programmed) cell data. The main motivation of our approach is to reduce the number of accesses of erased cells by binary code level transformation. This paper proposes a built-in write/read path architecture using binary code inversion method based on hot-spot region detection of instruction code access to reduce sensing current in S/A. From the profiling result of instruction access patterns, hot-spot region of an original compiled binary code is conditionally inverted with the proposed bit-inversion techniques. The de-inversion hardware only consumes small logic current instead of analog sink current in S/A and it is integrated with the conventional S/A to restore original binary instructions. The proposed techniques are applied to the fully-custom designed MCU with ARM Cortex-M0$^{TM}$ using 0.18um Magnachip Flash-embedded CMOS process and the benefits in terms of power consumption reduction are evaluated for Dhrystone$^{TM}$ benchmark. The profiling environment of instruction code executions is implemented by extending commercial ARM KEIL$^{TM}$ MDK (MCU Development Kit) with our custom-designed access analyzer.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.924-926
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• 2015

In this paper, we use the interface, which many countries concentrates research of Brain - Computer Interface with the device and MyndPlay based on the IoT intelligent Arduino. Finally we will make the Brain - Computer Connection environment, the purpose of Brain - Computer Interface. Recognizes the EEG of a person who wearing the equipment, analyze, classify, and we did a research to design an intelligent thing to suit user's condition. In addition, we use the XBee, and Bluetooth to communicate to other devices, such as smart phone. In conclusion, this paper check users current status via brain waves, and it allows to control the power and other objects by using the EEG(Electroencephalography).

• KIPS Transactions on Computer and Communication Systems
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• v.3 no.10
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• pp.357-364
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• 2014

The first mission for the IoT based hyper-connectivity communication is developing a device-to-device communication technique in infra-less low-power and lossy networks. In a low-power and lossy wireless network, IoT devices and routers cannot keep the original path toward the destination since they have the limited memory. Different from the previous light-weight routing protocols focusing on the reduction of the control messages, the proposed scheme provides the light-weight IPv6 address auto-configuration, IPv6 neighbor discovery and routing protocol in a IoT capable infra-less wireless networks with the bloom filer and enhanced rank concepts. And for the first time we evaluate our proposed scheme based on the modeling of various probability distributions in the IoT environments with the lossy wireless link. Specifically, the proposed enhanced RPL based light-weight routing protocol improves the robustness with the multi-paths locally established based on the enhanced rank concepts even though lossy wireless links are existed. We showed the improvements of the proposed scheme up to 40% than the RPL based protocol.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2021.05a
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• pp.285-286
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• 2021

With the recent development of Internet of Things (IoT) technology, smartization technology is expanding to the fields of agriculture, livestock, and fisheries, and smartization is in progress. In this smart technology, the most important thing is how to measure the data in the field and transmit it to the management system. Currently, the sensors used in the construction of smart farms and other livestock houses and farms are measuring and monitoring smart farms and other environmental conditions through various sensors such as temperature, humidity, CO gas, CO2, hydrogen, and O2. The communication method between these sensors and the HMI (Human Machine Interface) module that controls and manages the smart farm is still mainly using the RS-485-based modbus-RTU method. In this paper, we intend to design the MCU module for HMI so that various sensor modules can be connected to manage data through the RS-485-based Modbus method so that the sensor data required for smart farm construction can be managed by the HMI module.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.111-112
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• 2017

IoT(Internet of Thing)기술의 발전으로 다양한 분야에서 라즈베리파이(Raspberry Pi)와 같은 경량시스템으로, 실생활에 유용하게 사용될 수 있는 비전문 시스템에 대한 다양한 형태의 기술이 선보이고 있다. 한 예로, 스마트팜(Smart farm)분야에서는 다양한 온실 형태로 과실류를 재배하고 있으며, 보다 전문적인 챔버(Chamber)형태의 시스템으로는 관엽식물/채소/알뿌리식물/인삼 등 다양한 식물류에서 사용되어 질 수 있다. 이에 본 논문에서는 챔버 시스템 상에 서버와의 연결 없이 정해진 생육 규칙에 따라 자동으로 제어 되는 라즈베리파이 엣지(Edge)에 기반한 챔버 제어 시스템에 대한 연구를 담고 있다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2017.06a
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• pp.143-144
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• 2017

다양한 응용 매체의 유비쿼터스(ubiquitous) 연결을 위한 사물 인터넷 (Internet-of-Thing; IoT) 시스템은 저전력 광역 통신 (Low Power Wide Area; LPWA) 기술을 기반으로 한다. 저전력 광역 통신 시스템의 충족조건인 전송 거리 확대와 낮은 전력 사용은 시스템 전력 운용 관점에서는 상호 충돌하는 조건이다. 이를 위해 신호대역폭을 줄여 수신기 감도 (receiver sensitivity) 를 개선하는 초협대역 (Ultra Narrow Band; UNB) 기술이 주목받고 있다. 여기서는 이러한 저전력 광역 통신을 위한 초협대역 변조 기술의 신호 대 잡음 비(Signal-to-Noise Ratio; SNR)에 대해 분석한다.

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.314-315
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• 2020

현대의 많은 Internet of Thing (IoT)기기들의 충전방식이 유선 충전이 아닌 무선 충전을 사용함에 따라 다양한 연구들이 활발히 이루어지고 있다. 그 중 공진을 이용한 자기공진 방식의 무선충전 시스템은 전자기유도 방식보다 먼 거리에서 충전이 가능하고 공진부 코일의 중심점을 맞추지 않아도 효율에 큰 차이를 보이지 않는 장점이 있다. 점점 더 무선충전이 가능한 기기들이 많아짐에 따라 소모전력이 큰 기기들의 무선전력전송이 많이 연구되고 있다. 본 논문에서는 2개의 송신코일을 사용하여 기존의 1Transmitter - 1Rectifier (1Tx-1Rx) 방식보다 대용량 전력을 전송할 수 있음을 검증하고자 한다.