• Annual Conference of KIPS
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• 2012.11a
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• pp.1377-1379
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• 2012

최근 빅데이터의 활용에 대한 활발한 논의가 이루어지고 있는 가운데 데이터를 빠르게 처리할 수 있는 인메모리 시스템(In-memory System)에 대한 많은 연구가 진행되고 있다. 하지만 메모리만으로 인메모리 시스템을 구성할 경우 많은 비용과 전력을 필요로 한다. 이와 같은 문제점을 개선하기 위하여 SSD를 가상메모리로 활용하는 방법에 대한 연구가 진행되고 있다. 본 논문에서는 SSD를 가상 메모리로 활용하여 인메모리 어플리케이션의 성능을 측정하였다. 성능 평가 결과, SSD를 가상 메모리로 활용했을 때, RAM 사용량에 비례하여 성능 하락을 보였다. 하지만, 앞으로 SSD의 성능이 개선되고 발전할 경우 메모리를 SSD로 대체하여 사용하면 비용의 절감뿐 아니라 성능을 유지할 수 있을 것으로 기대된다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.147-148
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• 2019

최근 국민의 건강증진 및 질병관리 등에 대한 관심이 증가하면서 전문가들 또한 걷기 운동의 유효성을 강조하고 있다. 이에 따라 스마트 헬스케어와 관련된 기기 및 서비스에 대한 개발이 활발히 진행 중이다. 본 논문에서는 GPS와 비콘 센서를 이용한 환경에서 걷기운동과 미니게임 콘텐츠를 융합한 어플리케이션을 설계하고 구현한다. 이 콘텐츠는 특정 지역을 가상의 게임 맵으로 매칭하고 GPS센서와 리얼월드의 비콘을 블루투스 통신으로 인지하도록 하였으며 이를 통해 소모 칼로리 계산, 게임의 클리어 조건 등 핵심 시스템으로 사용한다. 본 연구를 통해 설계, 구현된 게임 콘텐츠는 이용자의 움직임을 정확히 측정할 수 있고 재미와 몰입감을 제공하여 지속적인 운동을 유도함으로써 운동효과가 향상됨을 확인할 수 있었다.

• Annual Conference of KIPS
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• 2009.04a
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• pp.1075-1078
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• 2009

Web 2.0 시대가 도래하면서부터 새로운 소프트웨어 배포 방식인 SaaS가 등장하였다. 보안 분야에서도 기존의 소프트웨어적인 보안 방식이 아닌 하드웨어적인 보안 방식을 위해 TPM이라는 보안 칩이 개발되었다. 본 논문에서는 TPM 칩을 사용하여 보다 신뢰적인 측면이 강조된 신뢰 컴퓨팅 기반 SaaS 모델을 설계하고, 설계된 모델의 가장 기본적인 기능인 로컬 PC 레벨의 PCR 값 인증 프로그램과 로컬 PC 레벨 어플리케이션 무결성 측정 프로그램을 구현하고 이를 평가한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.309-310
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• 2021

본 연구는 건강 이상 감지를 위해 보폭 이상을 판단하는 신발과 어플리케이션을 연동하여 알츠하이머 등의 뇌손상으로 인한 보폭 이상을 미연에 예방하고 개선하는데 목적이 있다. 보행 이상 감지를 위해 보폭을 판단하는 건강진단신발은 측정부가 설치되며, 알츠하이머 등의 뇌손상에 의해 보폭이 줄어드는 경우 보폭이 좁아지는 것을 경고함으로써 장소와 시간에 구애받지 않고 신발착용자 스스로 보행 진단 및 교정이 이루어질 수 있다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.4
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• pp.813-820
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• 2009

This paper describes the realization of ubiquitous healthcare monitoring system using wearable pulse oximeter based on a wireless sensor network. In order to obtain information of oxygen saturation from a patient, a small size and low power consumption wearable pulse oximeter was designed. Information of oxygen saturation collected by wireless sensor node was transmitted wirelessly to a base-station for storage and display purposes via wireless sensor network. Wireless sensor nodes were programmed by TinyOS application to perform data acquisition and transmission. Lab VIEW server program was designed to monitor information of oxygen saturation and process the measured PPG (photo plethysmogram) signals to APG(Accelerated plethysmogram) signals by appling second order derivatives. PPG signals are simple and cost effective technique to measure blood volume change.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.1
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• pp.193-198
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• 2017

Recently, as interest in health increases, various wearable devices such as smart watch and smart band which can measure user's biometric information are being studied. Conventional wearable devices service the measured biometric information in a form that provides simple monitoring, disease prevention, and exercise amount. However, the user is Lack to deal with the dangerous situation. In this paper, we propose a hazard notification system to address these problems. The biometric information measured by the acceleration sensor and the heart rate sensor is transmitted to the application through the Arduino in real time. It identifies the risk situation through sensor priority measurement and risk situation identification algorithm. If a dangerous situation occurs, a notification message is sent to the guardian indicating the current location of the user. Therefore, it can be expected that if a dangerous situation occurs to a user who needs protection, he can respond promptly.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.293-297
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• 2009

This paper describes a real-time reliable measurement and analysis system for ubiquitous healthcare based on IEEE802.15.4 standard. In order to obtain and monitor physiological body signals continuously, wearable pulse oximeter is designed in wrist that could used to measure oxygen saturation of a patient unobtrusively. The measured data was transferred to a central PC or server by using wireless sensor nodes via a wireless sensor network for storage and analysis purposes. LabVIEW server program was designed to monitor and process the measured photoplethysmogram(PPG) to accelerated plethysmogram(APG) by appling second order derivatives in server PC. These experimental results demonstrate that APG can precisely describe the features of an individual's PPG and be used as estimation of vascular elasticity for blood circulation.

• Culinary science and hospitality research
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• v.17 no.5
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• pp.108-121
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• 2011

The purpose of this study is to carry out the exploratory study on the easiness of using smart phone applications for searching food service information based on consumer characteristics. Examining the attributes of the easiness of using smart phone applications for searching food service information, this study checks the order of priority in the attributes and analyzes the correlation among the constructs of easiness of use, along with the difference in easiness of use based on demographic characteristics. The survey was conducted to the users of smart phones who live in 3 areas such as Seoul/Kyongki, Daegu/Kyongbuk, and Busan/Kyongnam from Jan. 3-Feb. 3, 2011, and total 264 copies of questionnaire were used for the final analysis. The result showed that the respondents considered the functions of searching restaurants, recommended restaurants, and the popularity list more important among the measurement items of easiness of use, and there was highly positive correlation between easiness to select restaurants and communication functions among all the factors drawn. It was found that there was significant difference in the function of searching restaurants, practicality, the easiness to select restaurants, communication, and the easiness to select menu on areas.

• Journal of KIISE:Information Networking
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• v.30 no.4
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• pp.461-473
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• 2003

Multimedia applications are much more sensitive to QoS(Quality of Service) than text based ones due to their data continuity. In order to provide a fast moving MH(Mobil Host) using multimedia application with a consistent QoS,an efficient call admission mechanism is in need. This paper proposes the 2SCA(2-Step Call Admission) scheme based on cal admission scheme using pripority to guarantee the consistent QoS for mobile multimedia applications. A calls of MH are classified new calls, hand-off calls, and QoS upgrading calls. The 2SCA is composed of the basic call admission and advanced call admission; the former determines the call admission based on bandwidth available in each cell and the latter determines the call admission by applying DTT(Delay Tolerance Time), PQeueu(Priority Queue), and UpQueue(Upgrade Queue) algorithm according to the type of each call blocked at the basic call admission stage. In order to evaluate the performance of our mechanism, we measure the metrics such as the dropping probability of new calls, dropping probability of hand-off calls, and bandwidth utilization. The result shows that the performance of our mechanism is superior to that of existing mechanisms such as CSP(Complete Sharing Policy), GCP(Guard Channel Policy) and AGCP(Adaptive Guard Channel Policy).

• The Journal of the Convergence on Culture Technology
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• v.7 no.3
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• pp.577-582
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• 2021

Recently, with the development of AR, VR, and smart device technologies, the demand for services based on non-face-to-face environments is also increasing in the fitness industry. The non-face-to-face online home training service has the advantage of not being limited by time and place compared to the existing offline service. However, there are disadvantages including the absence of exercise equipment, difficulty in measuring the amount of exercise and chekcing whether the user maintains an accurate exercise posture or not. In this study, we develop a standard exercise program that can compensate for these shortcomings and propose a new non-face-to-face home training application by using a deep learning-based body posture estimation image processing algorithm. This application allows the user to directly watch and follow the trainer of the standard exercise program video, correct the user's own posture, and perform an accurate exercise. Furthermore, if the results of this study are customized according to their purpose, it will be possible to apply them to performances, films, club activities, and conferences