• 기본간호학회지
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• 제9권3호
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• pp.434-446
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• 2002

Purpose: This study was to identify the prevalence of postprandial hypotension and its related risk factors, and investigate the relationship between the related symptoms and the occurrence of postprandial hypotension. Method: The data were collected from the 22th of August, 2000 to 7th May, 2001. The participants were 74 aged over 60 in Seoul and Chungju, Korea. Blood pressure was taken in the sitting Position at 15mins, 30mins and 60mins after starting meals. Result: 1) The prevalence of postprandial hypotension was 12.2% at 15mins, 25.7% at 30mins, 25.7% at 60mins after starting meals. 2) There was no significant difference in a9e, but there was significant difference in basal systolic blood pressure between responders and nonresponders to postprandial hypotension over the three different times. 3) There was no significant relation between the occurrence of postprandial hypotension and its related symptoms over the three different times. Conclusion: Findings indicate that this study will contribute to develop an assessment protocol and nursing strategies to identify risk factors and to prevent postrprandial hypotension for the aged.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2014년도 제49차 동계학술대회논문집 22권1호
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• pp.139-142
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• 2014

앉아서 생활하는 시간이 많은 현대인들에게 올바르게 앉는 자세는 매우 중요하다. 따라서 현대인들이 올바른 자세를 유지할 수 있도록 도와주는 자세 모니터링 시스템을 고안하게 되었다. 이 시스템의 주요 구성으로는 전원부와 계측부, 제어부, 통신부, 안드로이드기반 어플리케이션으로 나눌 수 있다. 전원부는 9V의 건전지 하나로 구성되어 있고, 2개의 레귤레이터를 통해 아날로그 회로(3.3V)와 MCU(5V)에 전원이 공급되어진다. 그리고 계측부는 6개의 압력센서를 이용하여 아날로그 값을 계측한다. 제어부와 통신부는 MCU 보드(MSP430 Launchpad)와 FB155BC Bluetooth Module로 구성되어 있고, 안드로이드기반 어플리케이션은 Bluetooth Module에서 받은 디지털 신호들을 스마트폰의 화면에 UI공정을 거쳐 디스플레이 한다. 본 연구는 잘못된 자세로 의자에 앉는 습관을 스마트폰의 화면을 통해 실시간으로 확인하고, 바른 자세로 앉을 수 있도록 하여 척추교정 및 척추질환 예방에 기여할 것으로 예상된다.

• 전기학회논문지
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• 제57권4호
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• pp.725-728
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• 2008

An elbow orthosis with a pneumatic rubber actuator has been developed to assist and enhance upper limbs movements and has been examined for the effectiveness. The effectiveness of the elbow orthosis was examined by comparing muscular activities during alternate dumbbell curl motion wearing and not wearing the orthosis. The subjects participated in the experiment were younger adults in their twenties. The subjects were instructed to perform dumbbell curl motion in a sitting position wearing and not wearing orthosis in turn and a dynamometer was used to measure elbow joint torque outputs in an isokinetic mode. Orthosis was controlled using contractile muscle force that is measured from force sensor through cDAQ-9172 board. The air pressure of the pneumatic actuator was 0.3MPa the most suitable air pressure. For the analysis of muscular activities, Electromyography of the subjects was measured during alternate dumbbell curl motion. The experiment results showed that the muscular activities wearing the elbow orthosis were reduced. With this, we confirmed the effectiveness of the developed elbow orthosis.

• 대한의용생체공학회:의공학회지
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• 제45권2호
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• pp.75-80
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• 2024

This research investigates the influence of chair tilt functionality on biometric signals and user comfort, addressing the ergonomic challenges posed by modern sedentary lifestyles. Through an experimental study involving eight male participants, the impact of chair tilt on electromyography (EMG), heart rate, metabolic rate, pressure distribution, and distance between the lumbar spine and the lumbar support part of the chair was measured across different seating postures. The study utilized chairs with both synchronous and non-synchronous tilt mechanisms to explore how adjustments in chair design affect user comfort and physiological responses during prolonged sitting. Key findings suggest that chair tilt functionality can significantly reduce muscle activity and energy expenditure, enhancing user comfort and potentially mitigating health risks associated with prolonged sedentary behavior. Notably, the study revealed a preference among participants for chairs that aligned the rotational center of the tilt with the hip joint, highlighting the importance of this ergonomic feature in enhancing user comfort. Additionally, the research proposes a novel methodology for assessing seating comfort through the analysis of both biometric and physical signals, providing valuable insights for the development of ergonomic chair designs focused on user health and comfort.

• 패션비즈니스
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• 제22권2호
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• pp.74-87
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• 2018

Many people who wear skinny jeans have expressed satisfaction or concern regarding the side effects of wearing the garments, based on specific demographic characteristics. For this study, we disseminated 373 copies of a questionnaire. Study subjects were eighteen-to fifty-nine-year-old man and women Linear regression was used for data analysis. Descriptive statistics included the ${\chi}^2$ test, t-test, ANOVA and Duncan multiple range test. Corresponding results in terms of difference analysis overall were significant when based on gender, marital status, age, occupation and the average score of satisfaction. The values were approximately three points. The qualitative results of difference analysis for side effects in wearing skinny jeans according to demographic characteristics were identified as the experience of displeasure by pressure. There was a significant difference according to gender. Leg edema was also observed based on gender, marital status, age, occupation and the experience of poor circulation of blood. The factor that has the greatest influence on satisfaction on wearing skinny jeans was sitting long hours.

• 한국컴퓨터정보학회논문지
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• 제17권8호
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• pp.107-114
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• 2012

본 논문에서는 인간의 가장 기본적이며 기초적인 운동인 걸음걸이로부터 검출할 수 있는 걸음 수 및 보행분석을 위해 전도성 섬유를 이용한 전기용량성 압력 센서를 깔창형태로 개발하였다. 개발된 깔창 형태의 센서는 보행시의 압력을 측정하여 보행신호를 검출하고, 검출된 신호를 이용하여 걸음 수 및 자세에 따른 압력 분포를 관찰하였다. 개발된 센서의 성능 검증을 위하여 국제규격의 표준분동을 사용하여 0 kg에서 100 kg 까지 10 kg씩 증가하여 무게에 따른 압력변화를 관찰하였으며, 그 결과 압력에 따라 비선형적인 특성을 가지고 캐패시턴스 값이 증가함을 보였다. 자세에 따른 압력변화 실험과 보행 횟수 검출비교를 위한 실험에서는 건강한 성인남성 다섯 명을 대상으로 4가지의 서로 다른 자세로 있을 때의 압력 변화를 관찰하였고, 보행 횟수 검출을 위해서는 시속 1 km/h와 4 km/h의 두 가지 걸음속도에서 3분 동안 걷게 하여 보행신호를 검출하였다. 상용 만보계 및 관찰자의 수계로 도출된 보수를 비교하였다. 기존의 상용 만보계는 저속(1 km/h)으로 걸었을 때 보수가 잘 측정되지 않은 반면 개발된 센서는 저속에서도 관찰자 수계대비 정확한 보수를 도출 할 수 있었다(상용 만보계 대비 평균 98.06 %의 인식률). 또한 자세에 따라 압력 값을 토대로 사용자의 자세를 모니터링 할 수 있음을 보였다. 본 연구는 향후 스마트폰과 무선 연동하는 스마트 보행관리 시스템을 개발하기 위한 기초연구이다.

• 한국지반공학회논문집
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• 제23권12호
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• pp.75-82
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• 2007

본 연구에서는 고결시 상재구속압(${\sigma_{sit}}'$), 상대밀도, 그리고 입자특성이 고결모래의 점착력과 고결결합 파괴구속압(${p_i}'_{(BP)}$)에 미치는 영향을 검토하기 위하여 400kPa 까지의 구속압으로 압밀된 고결모래에 대한 배수전단시험을 실시하였다. 시험결과 동일 상대밀도와 석고함유율로 고결된 모래의 점착력과 ${p_i}'_{(BP)}$는 ${\sigma_{sit}}'$에 관계없이 동일하게 결정되어, ${\sigma_{sit}}'$이 고결모래의 강도특성에 미치는 영향은 상대적으로 적은 것으로 나타났다. 반면, 상대밀도나 고결정도가 증가할수록 고결모래의 점착력과 ${p_i}'_{(BP)}$는 증가하였으며, 상대밀도가 점착력에 미치는 영향보다 ${p_i}'_{(BP)}$에 미치는 영향이 더 큰 것으로 나타났다. 또한 입자특성이 다른 세 종류의 모래시료에 대한 결과를 분석한 결과, 시료 입경이 작을수록 입자사이의 접촉점이 증가하여 점착력과 ${p_i}'_{(BP)}$가 크게 결정되었다.

• Archives of Plastic Surgery
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• 제34권2호
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• pp.209-216
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• 2007

Purpose: The ischial area is by far the most common site of pressure sores found in wheel chair bound paraplegic patients, because greatest pressure is exerted from the body on this area in a sitting position. Even after a series of successful pressure sore treatments, the site is very prone to relapse by the simplest ordinary tasks of everyday life. Therefore, it is crucial to preserve the main pedicle during primary surgery. Various surgical procedures employed to treat pressure sores such as myocutaneous flap and perforator flap have been introduced. After introduction of ischial sore treatment using the inferior gluteal artery perforator (IGAP) has been made, the authors experienced favorable clinical results of patients who have undergone IGAP flap procedure in a three year time period. Methods: A total of 17 patients received IGAP flap surgery in our hospital from January 2003 to May 2006, among which 14 of them being males and 3 females. Surgery was performed on the same site again in 6(35%) patients who had originally relapsed after receiving the conventional method of pressure sore surgery. Patients' average age was 49.4(27-71) years old. Most of the patients were paraplegic(11 cases, 65%) and others were either quadriplegic(4 cases, 23%) or ambulatory(2 cases, 12%). Based on hospital records and clinical photographs, we have attempted to assess the feasibility and practicability of the IGAP flap procedure through comparative analysis of several parameters: size of defective area, treatment modalities, occurrence of relapses, complications, and postoperative treatments. Results: The average follow-up duration of 17 subjects was 25.4 months(5-42 months). All flaps survived without any necrosis. Six cases were relapsed cases from conventional surgical procedures. All of them healed well during our follow-up study. Postoperative complications such as wound dehiscence and fistula developed in some subjects, but all were well healed through secondary treatment. A total of 2 cases relapsed after surgery. Conclusion: The inferior gluteal artery perforator flap is an effective method that can be primarily applied in replacement to the conventional ischial pressure sore reconstructive surgery owing to its many advantages: ability to preserve peripheral muscle tissue, numerous possible flap designs, relatively good durability, and the low donor site morbidity rate.

• 디지털산업정보학회논문지
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• 제13권4호
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• pp.81-90
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• 2017

This paper presents a smart seat for correction of driver posture while driving. We introduce good postures with seat height, seat angle, head height, back of knees, distances of foot pedals, tilt of seat, etc. There have been some studies on correction of good posture while driving, effects of driving environment on driver's posture, sitting strategies based on seating pressure distribution, estimation of driver's standard postures, and others. However, there are a few studies on guide of good postures while driving for problem of driver's posture using machine leaning. Therefore, we suggest a smart seat for correction of driver's posture based on machine leaning, 1) developed the system to get postures by 10 piezoelectric effect element, 2) collect piezoelectric values from 37 drivers and 28 types of cars, 3) suggest 4 types of good postures while driving, 4) analyze test postures by kNN. As the results, we can guide good postures for bad or problems of postures while driving.

• 한국음향학회지
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• 제30권8호
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• pp.468-473
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• 2011

잔향이 많은 공간에서는 음성을 명확하게 알아 듣기 어렵다. 음성의 명료도를 확보하는 데는 자음이 중요하므로 잔향음에 비하여 직접음을 크게 하는 것이 중요하다. 잔향이 많은 공간에 음향 시스템을 적절하게 설계하면 흡음 처리하지 않고도 높은 명료도를 얻을 수 있었다. 지향성이 좁은 스피커를 사용하여도 사람이 앉아 있는 영역으로 음을 집중시킬 수 있어서 음성의 명료도를 향상시킬 수 있다. 본 논문에서는 잔향이 많은 공간에서도 실내를 흡음 처리하지 않고 스피커의 지향성을 제어하여 높은 명료도를 얻을 수 있음을 실험을 통하여 제시하였으며, 음향 시스템을 적절히 튜닝함으로써 명료도를 더욱 향상시킬 수 있는 것을 제시하였다.