• Journal of Internet Computing and Services
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• v.8 no.1
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• pp.33-45
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• 2007

Using switches and sensors informing the current on or off state, this paper suggests a sleeping control and remote monitoring system that not only can recognize the sleeping situations but also can control for keeping an appropriate sleeping situation remotely, And we show an example that this system is applied to the healthcare sleeping mat, Our system comprises the following 3 parts: a part for detecting the sleeping situations, a part for extracting sensing data and sending/receiving the relating situated data, and a part controlling and monitoring the all of sleeping situations. In details, in order to develop our system, we used the touch and pressure-sensitive sensors with On/Off functions for a purpose of the first part, The second part consists of the self-developed embedded board with the socket based communication as well as extracting real-time sensing data. And the third part is implemented by service modules for providing controlling and monitoring functions previously described. Finally, these service modules are implemented by the TMO scheme, one of real-time object-oriented programming models and the communications among them is supported using the TMOSM of distributed real-time middleware.

• The Journal of the Convergence on Culture Technology
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• v.6 no.4
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• pp.813-818
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• 2020

Recently, with the rapid increase in technology and users of smart devices, the smart watch market has grown, and its utility and usability are continuously expanding. The strengths of smartwatches are wearable portability, application immediacy, data diversity and real-time capability. Despite these strengths, smartwatches have limitations such as battery limitations, display and user interface size limitations, and memory limitations. In addition, there is a need to supplement developers and standard devices, operating system standard models, and killer application modules. In particular, monitoring and application of user's biometric information is becoming a major service for smart watches. The biometric information of such a smart watch generates a large amount of data in real time. In order to advance the biometric information service, stable peer-to-peer transmission of sensing data to a remote smartphone or local server storage must be performed. We propose a synchronization method to ensure wireless remote peer-to-peer transmission stability in a smart watch system. We design a wireless peer-to-peer transmission process based on this synchronization method, analyze asynchronous transmission process and proposed synchronous transmission process, and propose a transmission efficiency method according to an increase in transmission amount.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.108-112
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• 2006

센서 네트워크는 제한된 에너지를 가지는 작은 노드들로 구성이 된다. 이 센서 네트워크에서 가장 큰 에너지 손실을 가져오는 부분은 RF통신 부분이라 할 수 있다. 해양 센서 네트워크는 통신 매체로 음파를 사용하기 때문에 RF를 사용하는 센서 네트워크보다 통신하는데 더 많은 에너지를 소모한다. 센서 네트워크에서 통신 횟수를 줄여 에너지 효율을 높이는 방법으로 네트워크 내 집계 연산이나 필터링 등이다. 해양환경에서 데이터 값들이 유사한 층을 가지고 있다. 이 유사층에서 네트워크 내 집계 연산과 필터링의 의미를 살펴보겠다. 해양 센서 네트워크는 기존의 토플로지와 다른 구조를 가지고 있다. 새로 제안하는 구조에 어떠한 개념과 기능이 있는지를 살펴본 후 센서 노드들 임계값을 사용하여 센싱된 데이터 값이 유사한 구간을 클러스터로 묶고 묶여진 클러스터 내에서 어떻게 데이터를 전송할 방법을 제안한다.

• Review of KIISC
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• v.27 no.6
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• pp.5-14
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• 2017

사물인터넷은 응용서비스, 플랫폼, 네트워크, 디바이스의 4계층으로 이루어진다. 사물인터넷의 전체적인 구조도를 보면, 다양한 디바이스가 사물인터넷 플랫폼에 센싱 빅데이터를 전송하고, 사물인터넷 플랫폼에서 수집된 데이터를 이용하여 응용서비스에 정형화된 데이터 서비스를 제공할 수 있다. 그러나 현재의 사물인터넷 플랫폼의 구조는 수백만개의 디바이스에서 생성되는 데이터를 관리하여 플랫폼에 높은 트래픽과 계산부하가 야기될 수 있는 구조이며 이로 인해 해당 플랫폼과 연동된 모든 응용서비스의 가용성이 낮아지고 단일장애지점(Single point of failure)의 원인을 제공한다. 본 논문에서는 단일장애지점에 대한 문제점을 해결하기 위해서 중앙화 된 사물인터넷 플랫폼 대신에 탈중앙화 된 사물인터넷 구조를 위한 방법을 제안하고자 한다. 특히 사물인터넷 플랫폼의 요구사항을 분석하여 탈중앙화 된 사물인터넷 플랫폼에서의 요구사항을 도출한다. 더 나아가 블록체인기반의 탈중앙화 된 사물인터넷 플랫폼을 통해서 기존의 4계층 사물인터넷 구조에서 3계층 사물인터넷 구조로 나아가는 방법을 제시한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.328-331
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• 2006

In Ubiquitous age, data collection that using wireless sensor node is increasing necessity. In this paper, collect data because uses PIC16F877 and Bluetooth, and constructs database in PC. The PIC16F877 is control radio sensor node. The PC construct to propose algorithm that updates control data with table. It is changes sensing cycle time of node into intelligence style because compare collected data of DB. Result of study inexpensive , and practical, and I can apply to industry spot constructing system briefly.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2017.10a
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• pp.539-540
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• 2017

In this paper, we propose system that automatically controlls greenhouse to make best environment to grow crops. The proposed system is consist of the function to automatically open and close water-roof, control the tubular well of ground water and remotely monitor information of greenhouse.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10d
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• pp.215-220
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• 2007

최근 센서 네트워크에서 에너지 효율성을 위한 다양한 연구가 진행 중이다. 특히 센서 노드의 저전력을 위해서는 센서 네트워크에서 전송되는 데이터의 횟수나 전송량을 최소한으로 줄이면서 효율적이면서 신뢰성을 가지는 질의에 대한 결과를 얻을 수 있어야 한다. 본 연구에서는 해양 센서 네트워크 상에서 데이터의 전송량을 줄일 수 있는 SDMTree(Sensing Data Management Tree)를 제안한다. 제안된 SDMTree는 질의 최적화를 위해 질의 처리기 구성 요소로 도입 가능하다. 해양 센서 네트워크에서 in-network 각 4레벨에서 하위 노드로부터 받은 데이터를 병합, 관리하기 위한 방법으로 데이터를 속성별로 구분하여 중복된 데이터를 제거하여 트리형태로 구성되기 때문에 질의에 대한 응답에 해당하는 데이터 검색시 정확하고 신속하게 처리할 수 있으며, 트리 구성 또한 중복 데이터 및 중복 영역을 배제하여 구성되므로, 상위노드가 하위 노드로부터 센싱 데이터를 수집하여 저장하기 위한 에너지와 상위 노드에서 하위 노드로 질의를 전송시 질의에 해당하는 특정 영역에만 질의를 전송할 수 있기 때문에 데이터 저장 및 통신에 소모되는 불필요한 에너지를 최대한 줄일 수 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.4
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• pp.157-163
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• 2014

User's sensitivity is recognized as a very important parameter for communication between company, government and personnel. Especially in many studies, researchers use voice tone, voice speed, facial expression, moving direction and speed of body, and gestures to recognize the sensitivity. Multiplex modality is more precise than single modality however it has limited recognition rate and overload of data processing according to multi-sensing also an excellent algorithm is needed to deduce the sensing value. That is as each modality has different concept and property, errors might be happened to convert the human sensibility to standard values. To deal with this matter, the sensibility expression modality is needed to be extracted using technologies like analyzing of relational network, understanding of context and digital filter from multiplex modality. In specific situation to recognize the sensibility if the priority modality and other surrounding modalities are processed to implicit values, a robust system can be composed in comparison to the consuming of computer resource. As a result of this paper, it is proposed how to assign the weight of multiplex modality using implicit data.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.7
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• pp.1398-1405
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• 2016

As wireless sensor networks become eligible as well as useful in several controled systems where surrounding environments are likely to be monitored, their stabilization become important research challenge. Generally, stabilization is mostly dependent on reliability of sensing value. To achieve such reliability in wireless sensor networks, the most of previous research work have tendency to deploy the same type of multiple sensor units on one node. However, these mechanisms lead to deployment problem by increasing cost of sensor node. Moreover, it may decrease reliability in the operation due to complex design. In order to solve this problem, in this paper, we propose a new validation scheme which is based on prediction and frequency value. In the proposed scheme, we take into exceptional cases account, for example, outbreak of fire. Finally, we demonstrate that the proposed scheme can detect abnormal sensing value more than 13 percent as compared to previous work through diverse simulation scenarios.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.925-928
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• 2007

Abilities of sensing and communication are vested in private things of actual space, therefore, Ubiquitous Computing which is offered various services with human approach will be common in the future society. For the realization of this Ubiquitous Service requires some technique such as situations of environment and recognition of locations by the Sensor Network, then sensor data have to be transferred to an application service after processes. However, there are some hindrances for communication between an application service and sensor data, these are that accessibility of data usefulness and problems of Platform and protocol in each sensors. In this paper, suggest a reference model that is independent from platform and implementation language, for USN application service with using standardized protocol.