• 생명과학회지
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• 제19권10호
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• pp.1368-1373
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• 2009

본 연구는 미국 유타주에 거주하는 10-15세 어린이와 청소년들의 허리둘레가 electronic pedometer (전자 보수계)의 타당성과 신뢰성에 미치는 영향을 분석하기 위하여 비만집단 10명(HWC, BMI $28.91\pm3.07$)과 일반집단 10명 (LWC, BMI $18.05\pm1.55$)으로 총 20명(14 Hispanic and 6 Caucasian)의 어린이와 청소년들을 대상으로 실시하였다. Electronic pedometer 의 신뢰성을 측정하기 위하여 각 어린이는 Yamax SW-701 electronic pedometer 를 허리에 차고 15계단 오르기와 15계단 내리기를 3 sets 실시한 결과, HWC 집단이 LWC 집단보다 더 많은 보수를 기록했으나 오르기와 내르기 시행의 주 효과는 유의한 차이가 없었고, 또 두 집단간의 상호작용에도 유의한 차이가 없었다. 보수를 측정하여 pedometer의 타당성에 허리둘레가 미치는 영향을 분석하기 위하여 각자의 보행 속도에 따라 400 m를 걷게 한 결과 주 효과는 두 집단 간에 유의한 차이가 있었으나 counting technique (hand-counted vs. pedometer counted)의 주 효과는 유의한 차이가 없었으며, 또 400 m 걷기의 시기와 group별 시기의 상호작용도 유의한 차이가 없었다. 이러한 결과는 pedometer가 walking steps 측정에 HWC 집단과 LWC 집단에 동일하게 타당도가 있음을 나타내고 있다. 추후의 연구에서는 어린이들의 walking speed, pedometer tilt angle, leg length, 및 stride length 등을 고려한 연구가 필요하다고 사료된다.

• 대한전기학회논문지:시스템및제어부문D
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• 제55권9호
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• pp.420-422
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• 2006

This paper proposes a new method to count the number of steps for personal navigation systems. The proposed method resolves the mis-counting problem caused by the variation of the ground and walking behavior. To this end, a 2-axis accelerometer is utilized and a reliable step counting algorithm is developed. Experimental test was carried out to show the effectiveness of the proposed method. Test results show that the proposed method gives a robust performance for several types of ground and walking behavior.

• 대한영양사협회학술지
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• 제22권2호
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• pp.131-142
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• 2016

The purpose of this study was to assess the physical activity and energy balance of weekdays and weekend in male high school students. Fifty healthy male high school students participated in this study. Anthropometric data were collected. Physical activity level (PAL) and energy intake for weekdays and weekend were calculated from a physical activity diary and food diary using the 24-hour recall method and interview. The resting metabolic rate (RMR) and estimated energy requirement (EER) were calculated from the prediction equations suggested in 2015 KDRIs. Total energy expenditure (TEE) was calculated by multiplying RMR by PAL. Mean age of subjects was $15.9{\pm}0.33years$. The daily pedometer counts were significantly higher in the weekdays (12,837 steps) than in weekend (6,661 steps) (P<0.001). The PAL of the weekdays ($1.63{\pm}0.17$) was significantly higher than that ($1.37{\pm}0.26$) of the weekend (P<0.001). PAL was significantly correlated with pedometer counts on the weekdays (r=0.495) and weekend (r=0.686). The total energy intakes ($2,847.2{\pm}681.5kcal$) and TEE ($3,046.3{\pm}437.3kcal$) of weekdays were significantly higher than those of the weekend. The results of this study would be useful to develop nutrition and exercise programs for male high school students on weekdays and weekend, respectively.

• 제어로봇시스템학회논문지
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• 제7권5호
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• pp.454-464
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• 2001

In this paper, a personal navigation system is developed using GPS and dead reckoning sensors. This personal navigation system can be used to track a person inside a building, on an urban street, and in the mountain area. GPS can provide accurate absolute position information, but it cant be used without receiving enough satellite signals. Although the inertial sensors such as gyro an accelerometer and be used without this diggiculty, the inertial sensors severely suffer from their drift errors and the magne-tometer can be easily distorted by surrounding electromagnetic field. GPS and DR sensors can be inte-grated together to overcome these problems. A new personal navigation system that can be carried wit person is developed. A pedometer. actually vertically mounted accelerometer, detects ones footstep and gyro detects heading angle. These DR sensors are integrated with GPS and the humans walking pattern provides additional navigation information for compensating the DR sensors. The field testes are performed to evaluated the proposed navigation algorithm.

• 전기학회논문지
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• 제59권6호
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• pp.1150-1158
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• 2010

In this paper, a new reliable portable activity monitoring device implemented with the buddhist-style bowing activity and walking step detection algorithm, is presented. In order to monitor the bowing and walking activities, miniaturized 3-axis accelerometer sensor with the sensitivity of 800 mV/g was used. After initial signal conditioning, vector magnitude of accelerometer signals was calculated. Syntactic peak detection method was used in order to feature points. All signal processing algorithms were implemented in ultra-low power microcontroller MSP430 with double precision floating point arithmetic. For evaluation, 19 young man($24.22\pm5.22$ yrs) and woman($22.28\pm2.72$ yrs) were involved. The accuracy of the proposed algorithms were 98.91 %($\pm0.011$) for walking step detection and 98.25 %($\pm0.023$) for buddhist-style bowing activity. Comparing to the commercialized pedometer accuracy, 87.1 %($\pm0.058$), the proposed walking step detection algorithms show more reliable accuracy.

• Journal of Korean Biological Nursing Science
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• 제17권2호
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• pp.89-96
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• 2015

Purpose: Despite well-known benefits of walking on cardiovascular health, no structured walking exercise program has been formally tested on elderly Korean immigrants (EKIs). This pilot randomized controlled trial study assessed the effect of a walking program on walking behavior (pedometer steps count), stress (cortisol), depressive symptoms (CESD-10), and cardiovascular disease biomarkers (hs-CRP and fibrinogen) via venipuncture in EKIs. Methods: Seventy EKIs recruited from a Korean community were randomly assigned to a 12-week walking group or control group in a 3:2 ratio. The working program included a pedometer, buddy, monthly coffee card, weekly call for goal setting, and physical activity consultation. Walking group EKIs maintained the Centers for Disease Control and Prevention recommended exercise guidelines and good mental health status over 12 weeks. Results: There was no significant difference in the outcomes between control and walking groups. Conclusion: Social networking with Koreans in the senior center and church from a well-established Korean community might have positive effects on mental health.

• 대한영양사협회학술지
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• 제11권2호
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• pp.159-169
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• 2005

The purpose of this study was to assess the energy expenditure and investigate the relationship between related variables in 70 female university students. Resting energy expenditure estimated by Harris-Benedict formula, WHO/NAO/FAO formula and various formulas based on body weight and body surface area were 1366.9$\pm$74.4kcal/day, 1287.8$\pm$106.6kcal/day, 1171.4$\pm$155.8kcal/day and 1342.0$\pm$97.4kcal/day. Measured resting energy expenditure by indirect calorimetry(Model : Metavine and TrueOne2400) were 1582.0$\pm$150.1kcal/day and 1268.2$\pm$152.9kcal/day, respectively. Average step number per day was 11981.2$\pm$3014.4 steps and average step number per hour was 746.1$\pm$198.0 steps/hr. Daily energy expenditure by using Harris-Benedict formula, body weight formula, body surface area formula, WHO/NAO.FAO formula and 15-min check list formula were 2374.7$\pm$249.6kcal, 2033.5$\pm$313.2kcal, 2331.2$\pm$266.0kcal, 2240.8$\pm$185.5kcal and 2195.5$\pm$398.3kcal. Meanwhile energy intake of subjects was 1714.9$\pm$551.2 kcal. Daily energy expenditure has positive correlation(r=0.262) with daily step number. And there was significant positive correlations(r=0.35-0.68) between various daily energy expenditures and muscle mass. These results suggested that increase of daily step number by using pedometer is good method to increase daily energy expenditure. In particular, increase in step number can reinforce the amounts of muscle.

• 한국콘텐츠학회논문지
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• 제16권11호
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• pp.83-90
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• 2016

본 논문에서는 저전력 통신 기술인 IEEE 802.15.4 MAC (Media Access Control) 프로토콜에서 지원하는 Collision Free Period(CFP)에서의 전송 성능 분석을 수행한다. 분석을 위해 CFP의 서비스 타겟인 주기적 트래픽을 고려하고 Quality of Service 요구사항에 따라 MAC 계층에 전달되는 패킷전달 형태를 batch와 non-batch로 구분하여 throughput, delay, energy 측면에서 성능을 분석한다. 도출된 분석 결과를 토대로 Pedometer, ECG, EMG와 같이 주기적인 트래픽을 생성하는 헬스케어 애플리케이션에 대해 Collision Avoidance Period(CAP)에서의 전송과 성능 비교를 수행한다. 성능 평가를 통해 헬스케어와 같이 주기적이며 time-critical 트래픽을 생성하는 애플리케이션은 CFP 전송이 에너지 효율적이며 대역폭 요구 사항이 큰 애플리케이션에서는 CAP 대비 최대 46%의 에너지가 절감됨을 확인하였다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2016년도 추계학술발표대회
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• pp.503-505
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• 2016

최근 전 세계적으로 비만의 문제점이 드러남에 따라 국가적 차원에서 비만인구를 줄이기 위한 노력을 하고 있다. 비만 해소에 가장 효율적인 운동으로 평가받고 있는 걷기운동을 효율적이고 효과적으로 수행할 수 있도록 도와주는 만보기는 다양한 형태의 기기 또는 어플리케이션으로 큰 인기를 얻고 있다. 이에 본 논문에서는 보다 정확한 만보기를 제작하기 위해 센서 및 체형, 신발의 종류에 따라 어떠한 특성을 가지는지 분석하고 효과적인 만보기 어플리케이션 구축 방법을 제안한다.

• 한국컴퓨터정보학회논문지
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• 제24권1호
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• pp.159-166
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• 2019

Recently, the advanced development of smart devices has increased the interest in health-care, and many people are paying more attentions to disease prevention than disease treatment. Among these prevention methods, the bare body movement has received much attention, and especially walking exercise is attracting much attention because it is enjoyable without any restrictions on place and time. Walking exercise is generally divided into two types: walking on the ground and climbing the stairs. Walking up the stairs consumes much more calories compared to walking on the ground. These walking exercises have the advantage that they can be easily performed by male and female without special equipments or economic considerations. However, there is a lack of applications and systems that accurately determine such walking and stair walking and measure momentum according to stair walking. In this paper, we designed and implemented a real-time walking status analysis system using smartwatch's, pedometer, smartphone's barometer and beacons.