• KSII Transactions on Internet and Information Systems (TIIS)
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• 제14권6호
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• pp.2377-2397
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• 2020

Human activity recognition is widely used in smart homes, health care and indoor monitor. Traditional approaches all need hardware installation or wearable sensors, which incurs additional costs and imposes many restrictions on usage. Therefore, this paper presents a novel device-free activities recognition system based on the advanced wireless technologies. The fine-grained information channel state information (CSI) in the wireless channel is employed as the indicator of human activities. To improve accuracy, both amplitude and phase information of CSI are extracted and shaped into feature vectors for activities recognition. In addition, we discuss the classification accuracy of different features and select the most stable features for feature matrix. Our experimental evaluation in two laboratories of different size demonstrates that the proposed scheme can achieve an average accuracy over 95% and 90% in different scenarios.

• International journal of advanced smart convergence
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• 제1권2호
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• pp.1-11
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• 2012

IP-based Wireless Sensor Networks (IP-WSNs) are gaining importance for their broad range of applications in health care, home automation, environmental monitoring, industrial control, vehicle telematics, and agricultural monitoring. In all these applications, a fundamental issue is the mobility in the sensor network, particularly with regards to energy efficiency. Because of the energy inefficiency of network-based mobility management protocols, they can be supported via IP-WSNs. In this paper, we propose a network-based mobility-supported IP-WSN protocol called mSFP, or the mSFP: "Multicasting-supported Inter-Domain Mobility Management Scheme in Sensor-based Fast Proxy Mobile IPv6 Networks". Based on [8,20], we present its network architecture and evaluate its performance by considering the signaling and mobility cost. Our analysis shows that the proposed scheme reduces the signaling cost, total cost, and mobility cost. With respect to the number of IP-WSN nodes, the proposed scheme reduces the signaling cost by 7% and the total cost by 3%. With respect to the number of hops, the proposed scheme reduces the signaling cost by 6.9%, the total cost by 2.5%, and the mobility cost by 1.5%. With respect to the number of IP-WSN nodes, the proposed scheme reduces the mobility cost by 1.6%.

• 사물인터넷융복합논문지
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• 제2권1호
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• pp.1-6
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• 2016

사물인터넷은 네트워크에 연결된 사람, 사물, 공간 등 모든 것들(Things)이 실시간으로 데이터를 생성하고 해당 객체간의 정보가 수집, 공유, 활용되는 기술이나 환경을 일컫는다. 현재 헬스케어, 스마트홈 등 다양한 분야에서 연구가 진행이며 사물인터넷 환경에 지리적 공간과 인터넷 간의 연결성을 강조한 만물인터넷의 개념도 등장했다. 사람, 사물 등 각 객체간의 연결성이 중요하게 부각되면서 효율적이고 안전한 인증기술에 대한 연구가 진행 중이다. 이 논문에서는 사물인터넷 환경에서 사람, 사물 등 객체간의 상호인증을 위한 개선된 RADIUS(Remote Authentication Dial In User Service) 프로토콜을 제안한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권2호
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• pp.529-546
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• 2012

To address the need for autonomous control of remote and distributed mobile systems, Machine-to-Machine (M2M) communications are rapidly gaining attention from both academia and industry. M2M communications have recently been deployed in smart grid, home networking, health care, and vehicular networking environments. This paper focuses on M2M communications in the vehicular networking context and investigates areas where M2M principles can improve vehicular networking. Since connected vehicles are essentially a network of machines that are communicating, preferably autonomously, vehicular networks can benefit a lot from M2M communications support. The M2M paradigm enhances vehicular networking by supporting large-scale deployment of devices, cross-platform networking, autonomous monitoring and control, visualization of the system and measurements, and security. We also present some of the challenges that still need to be addressed to fully enable M2M support in the vehicular networking environment. Of these, component standardization and data security management are considered to be the most significant challenges.

• 한국식품조리과학회지
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• 제26권6호
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• pp.699-706
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• 2010

Since atopic dermatitis requires continuous care, the role of a patient's parents is important. However, the majority of parents cause even more serious situations by limiting allergy-inducing foods too much, causing an imbalance in nutrition and decline in immunity. Therefore, educating parents systematically and repeatedly via personal computer or smart phone could help to prevent and manage atopic dermatitis. In this study, 126 recipes of 4 seasons were developed for the parents of atophy students by using food with least chemical additives. After developing these recipes, a blog named "Atop" meaning "atophy stop" was made with these recipes and cooking step photos. In this blog, the visitors who used these recipes showed improvement responses of atopic dermatitis management. The results of this study show that further nutrition education programs such as this blog should be developed continuously and an effective evaluation tool must be also developed for the further prevention and management of atopic dermatitis.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2014년도 추계학술발표대회
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• pp.833-836
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• 2014

화장품산업의 세계적 트렌드는 기능성화장품에서 개인별 맞춤 화장품 시장으로 발전하고 있다. 해외 유명 브랜드 제품들이, 발 빠른 대처로 보다 세분화되고 기능성을 갖춘 화장품을 생산하면서, 고가로 출시하고 있으나 개인의 다양한 피부 특성과 기호에 상응하는 맞춤 제품을 제공하진 못하고 있는 실정이다. 이러한 환경에K-Beauty의 영향을 고려하여 개인별 피부특성과 요구사항을 반영한 맞춤화장품 개발을 위해 국내에 거주하는 전국의 20대 여성들을 주 대상으로 자가 설문과 피부측정을 통해 피부특성을 분석하고 이에 따른 중요 요인들을 찾고자 하였다. 결과를 통해 국내의 20대 여성들은 지성타입의 피부와 민감성에 많은 분포를 가진 것으로 확인되었고, 선행연구의 내용과 상응하는 결과 외에 피부 타입과 민감성에는 적극적인 피부 관리를 위한 생활습관 등이 중요한 영향을 미치고 있음을 확인할 수 있었다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2014년도 추계학술발표대회
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• pp.625-627
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• 2014

모바일 헬스케어의 기본 개념은 '치료'가 아닌 '관리'에 있다. 심박수 측정으로 내가 가진 운동 능력을 얼마나 사용하고 있는지 또는 얼마나 사용할 것인지 조절할 수 있고 자신에게 필요한 운동을 맞춤형식으로 조절이 가능하다. 선행연구에서 다뤘던 심박수 구간별 3대 영양소 연소 비율을 통해 다이어트를 목적으로 운동을 조절할 수도 있고 근력 강화를 위해 전문 트레이닝을 강행 할 수도 있다. 본 연구에서는 건강관리를 위한 생체신호 측정 센서 기반 스마트 기기로 심장수을 믈루투스를 사용하여 측정하고 이상을 예측 보고할 수 있는 프로토타입을 개발하고, 정성적, 정략정 평가를 설시하였다. 향후, 사용성 평가 결가를 기반으로 도출된 문제점의 수정 보완을 통해 최종 센서기반 스마트 심장박동 관리기를 구성하고자 한다.

• Journal of Preventive Medicine and Public Health
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• 제46권sup1호
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• pp.22-27
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• 2013

The purpose of this study was to examine the beneficial effects of a new cognitive intervention program designed for the care and prevention of dementia, namely Learning Therapy. The training program used systematized basic problems in arithmetic and Japanese language as training tasks. In study 1, 16 individuals in the experimental group and 16 in the control group were recruited from a nursing home. In both groups, all individuals were clinically diagnosed with senile dementia of the Alzheimer type. In study 2, we performed a single-blind, randomized controlled trial in our cognitive intervention program of 124 community-dwelling seniors. In both studies, the daily training program using reading and arithmetic tasks was carried out approximately 5 days a week, for 15 to 20 minutes a day in the intervention groups. Neuropsychological measures were determined simultaneously in the groups both prior to and after six months of the intervention. The results of our investigations indicate that our cognitive intervention using reading and arithmetic problems demonstrated a transfer effect and they provide convincing evidence that cognitive training maintains and improves the cognitive functions of dementia patients and healthy seniors.

• 한국IT서비스학회지
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• 제18권1호
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• pp.27-44
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• 2019

The goal of this study is to find why the consumers are reacting slowly or negatively toward smartwatches. Even though, smartwatches provide useful information such as health care and text message, the market was not growing fast as expected, and seems to be stagnant at this point. Thus, the future market predictions are varied. To find out why this may have happened, a Q-method study using non-adopters was conducted. In order to find out depth explanations from each interviewers, the research team chose the Q method and Q sorting to classify the different reasons for non-adopters. Based on the interview, all participants were clustered with into groups with similar patterns of the answers. The research team classified the interview group to three categories 1) Technology Discontent 2) Service Discontent 3) Indifferent. The research team analyzed each category reasoning and logics. Also the team compared the result to the technology chasm as it was proposed by Rogers (1969) to measure the maturity of the consumers.

• International journal of advanced smart convergence
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• 제12권4호
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• pp.418-425
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• 2023

This study examined the importance of screening for changing bodybuilding and fitness category. The screening criteria for bodybuilding, the background and reason for the creation of new bodybuilding and fitness items, the screening criteria for new items, and the use of drugs were described. The current bodybuilding gives high marks to excessive muscles and excessive diet conditions, and new bodybuilding category have been newly established in line with the recent global trend of pursuing natural beauty over abnormally excessive muscles, and the screening criteria also prioritize the balance of ideal and overall muscles to fit your height and weight. In addition, fitness events such as physique and bikini are gaining popularity with the establishment because they focus on not excessive muscles and natural elements of the body that ordinary people can challenge. Since athletes as well as ordinary people are using drugs to increase muscles and suffer side effects, IFBB(International Federation of BodyBuilding) and KBBF(Korea Body Building Federation) should consider and improve the current bodybuilding screening standards that avoid excessive muscles, and it is believed that bodybuilding and fitness events will develop only when strict punishment and continuous anti-doping education are carried out.