• 한국운동역학회지
• /
• 제31권2호
• /
• pp.104-112
• /
• 2021

Objective: This study aimed to analyze the effects of consecutive whole body vibration through heel raise posture on the center of pressure and electromyography of anterior tibial muscle, lateral gastrocnemius and soleus muscles during single-leg stance. Method: The subjects of this study included 30 healthy males in their 20's, with the following inclusion criteria: no history of orthopaedic medical history, no participation in regular exercises, no history of whole body vibration exercise, and right leg being the dominant leg. The experimental procedure involved pretreatment measurement of eye open single-leg stance, application of whole body vibration for 30 seconds, post-treatment measurement (3 measurements in total). Static and dynamic movements have been measured over 2 separate experiments, with 72 hours gap between the experiments. Static movement involved maintaining single-leg heel raise posture for 30 seconds while applying whole body vibration, and dynamic movement involved heel raise (15 repetitions over 30 seconds) while applying whole body vibration. The strength of applied whole body vibration was 35 Hz frequency and 2~4 mm amplitude. Results: As the single-leg posture after static heel raise posture, mediolateral velocity of the center of pressure at post 2 and post 3 were significantly reduced compared to the pre-treatment measurement. In addition, the percentage for reference voluntary contraction in anterior tibial muscle and soleus and median frequency at anterior tibial muscle and lateral gastrocnemius muscle at post 3 were significantly decreased compared to the pre-treatment value. As the single-leg posture after dynamic heel raise posture, the mediolateral 95% edge frequency of the center of pressure and median frequency at anterior tibial muscle, lateral gastrocnemius muscle, and soleus muscle at post 3 were significantly reduced compared to the pre-treatment value. Conclusion: Acute whole body vibration via static and dynamic heel raise posture have positive effect on mediolateral posture control during single-leg stance.

• The Journal of Asian Finance, Economics and Business
• /
• 제7권12호
• /
• pp.329-336
• /
• 2020

This study aims to assess the impact of competitive pressure and innovation capability on business performance in small- and medium-sized enterprises (SMEs) in the batik industry in East Java, Indonesia. Furthermore, this study explores the impact of competitive pressure on business performance through innovation capability as a mediating variable. This research was quantitative using primary data with questionnaire as a method of sampling collection. The measurement of the variables was captured using Likert scale. The respondents were small- and medium-sized enterprises (SMEs) in the batik industry in East Java Province, Indonesia. The sample totaled 254 subjects. The data analysis was done using SEM-PLS. The results of the study show that: 1) there was a positive direct impact of competitive pressure on business performance; 2) competition pressure positively influences innovation capability; 3) innovation capability positively influences business performance; and 4) innovation capability has a partial mediating role in the effect of competitive pressures on business performance. The findings of this study suggest that managers in SME's batik industry should increase their effort to cope with the high competitive pressure to increase the innovation capability, so that they can have an advantage to face successfully competitors, leading to higher business performance.

• 한국재난정보학회 논문집
• /
• 제9권3호
• /
• pp.282-289
• /
• 2013

국내에서 이동실험실(BL3급)에 대한 연구와 기술개발 시도가 지속적으로 있어 왔다. 그러나 사업성과 제작기술 적용 문제로 주로 국외에서 이동실험실 차량 전체를 도입하여 보급하거나 국내 제작된 차체에 쉘터 부분은 국외에서 도입하는 방식으로 특수차량이 제작되어 왔다. 차량제작에 있어 쉘터부분의 양압과 음압의 기술력 확보가 관점이며, 각 설비별 기능분석을 통해 국산화 및 표준화 전략을 알아보고 기능개선 방향과 현 장비의 문제점을 확인하여 기존 도입된 특수차량들의 내부 구조와 기능에 대한 비교.분석을 통한 국내외의 제작기술을 확인하고 이를 적용하여 개선된 기술력을 확보하여 쉘터 내부의 양압설비와 구조설비에 적용할 수 있는 국산화 방안 모색하고 기존 분석 이동실험실의 제원.탑재장비의 현황을 참고하여 국내에 도입 가능한 이동식 측정분석차량 제작을 모색하고자 한다.

• Child Health Nursing Research
• /
• 제11권4호
• /
• pp.456-464
• /
• 2005

Purpose: To determine the effects of hand massage on nausea and vomiting, and anxiety in children with Iymphocytic leukemia receiving high dose chemotherapy. Method: The children were assigned to an experimental group(15) or a control group(15). All of the children were diagnosed with acute Iymphocytic leukemia and admitted for high dose chemotherapy at C University Medical Center in Seoul. The hand massage was performed for 10 minutes twice a day over three days. To measure the effects of hand massage, the Index of Nausea and Vomiting by Rhodes et al. and the State-Trait Anxiety Inventory for children by Spielberger were used. The level of anxiety was measured by systolic blood pressure, diastolic blood pressure, and pulse rate. Results: The score for nausea and vomiting decreased in the experimental group. State anxiety for the experimental group was significantly more positive than for the control group at the 2nd measurement. There was a significant difference in systolic blood pressure between the two groups. The level of diastolic blood pressure in the two groups decreased significantly over time. Conclusion: Hand massage could be effective in decreasing nausea and vomiting, state anxiety, pulse rate and blood pressure in children with acute leukemia receiving high dose chemotherapy.

• 한국식품영양학회지
• /
• 제6권4호
• /
• pp.255-267
• /
• 1993

This study was performed to investigate the correlations among physical anthropometric measurement, diet intakes, physical fitness test, and serum lipids in eight sedentary women(control group), and twenty seven exercising women(aerobic groups), aged 35~45 years. The results of the study are as follows : 1) systolic blood pressure(SBP) and diastolic blood pressure(DBP) of aerobic groups were lower than serf entary. Pulse rate was decreased according to the length of aerobic periods. Muscular endurance and jump power of all subjects were stronger than standard range, and those of aerobic exercising groups were stronger than control group. Muscular power of the upper half of the body In all subjects were lower than standard range. 2) Daily calorie intakes of all subjects were in the ring: of recommended dietary allowances (RDA) for Koreans. But daily protein Intakes were higher than RDA. daily cholestrol intakes of all subjects were slightly less than 200~300 mg: which is normal consumption of Koreans. 3) There was a significant positive correlation between serum 7G and daily protein intakes. It was considered that excessive protein intake converted to serum 7G. There was not a significant correlation between serum TC and dietary TC. Therefore, dietary TC seemed to have not much effect on serum TC. Physical fitness was negatively related to serum TG, TC, LDL-C, but positively related to HDL-C, HDL-C /TC. It was found that the serum lipids could be changed better according to improving the physical fitness. There were significant positive correlations between SBP and serum TC, LDL-C. (According to this results), the higher SBP, the higher serum TC, LDL-C tended to be. There was a significant positive correlations between sit up and weightloss nth exercise r=0.7(p<0.001), push ups and weightless with exercise r=0.5(p<0.001). It was considered that muscle strength could be improved according to the weightloss. 4) The purpose of exercise in aerobic groups was rather promoting health than reducing body fatness. Most of al1 subjects (83.2%) drank caffeine-contained beverage therefore, we should concern about that absorption of Fe could be Interrupted and blood pressure could be elevated by caffeine.

• 대한인간공학회지
• /
• 제13권1호
• /
• pp.47-58
• /
• 1994

The purpose of this study was to obtain the basic data for a design for comfort wear. The subjects of this study were 197 women's university stu- dents. The characteristics of their body types and the thickness of subcuta- neous fat at eight body sites were measured. The thickness of subcutaneous fat was measured by both Ultrasonics and with a Skinfold Caliper. The cor- relation between their values and the thickness of subcutaneous fat were compared. The relationship between Rohrer Index and the subject's self- conception of their body was also compared. The results were as follows: 1. The measurement of thickness of subcutaneous fat at triceps and scapula was a little lower, in using Skinfold Caliper method, than Ultrasonics method because of the pressure of the caliper. 2. Correlation between percentage of fat in body and body characteristics was high in order of chest girth > weight > abdomen girth. 3. The thickness of subcutaneous 8 body these sites was high in order of thigh > triceps > scapula > abdomen > suprailiac > chest > calf > forearm. Percentage of body fat has a positive correlation with both average thickness of subcutaneous fat and thickness of subcutaneous fat at triceps. 4. Rohrer Index shows a positive correlation between average thickness of subcutaneous fat and percentage of body fat. 5. About half of subjects of this study thought that they were obese although the data proved otherwise.

• 대한기계학회논문집B
• /
• 제24권7호
• /
• pp.924-929
• /
• 2000

This paper addresses a new technique of measuring the mean flow velocity over the cross sectional area of the pipe using sound field reconstruction. When fluid flows in the pipe and two plane waves propagate oppositely through the medium, the flow velocity causes the change of wave number of the plane waves. The wave number of the positive going plane wave decreases and that of negative going one increases in comparison to static medium in the pipe. Theoretical backgrounds of this method are introduced in detail and the measurement of mean flow velocity using the sound field reconstruction is not affected by velocity profile upstream of microphones.

• Journal of Nutrition and Health
• /
• 제34권1호
• /
• pp.62-68
• /
• 2001

The purpose of this study was to confirm that regular physical exercise habit and calcium intake play a role reducing the risk of cardiovascular diseae, particularly to confrim that regular exercise is important in reducing serum lipid levels. Subjects were classified into regular exercise group(more than 3 times/wk, more than 30 min per exercise) and non-regular exercise group. A convenient frequency method was used to assess the nutritional intake of subjects. Anthropometric measurement such as bodyweight and hight, and blood pressure were measured. There was no significant difference between nonexercisers and exerciser in energy intake, calcium intake and blood lipid levels. The strength of frequency of exercise may not by adequate to modify lipid profiles in premenopausal woman with normal lipid level, Although we found no significant difference in blood lipid levels, this result does not imply there are no benefits of exercise subjects. There were no signigicant correlations between age or weight with blood lipids in regular exercise group, while there were significant positive correlations between age of weight with blood lipids in non-regular exercise group. The levels of serum cholesterol, and triglyceride, blood pressure and atherogenic index increased with age in nonexercise women, Especially, atherogenic index was lower in regular exercise group. The blood pressure in nonexercise group was significantly higher than that in regular exercise group There was a highly significant negative correlation between calcium intake and blood pressure in nonexercise women, There was a highly significant negative correlation between calcium intake and blood pressure in nonexercise women. The results suggest that increased habitual physical activity and calcium intake may have desirable effects on serum lipid levels and blood pressure in premenopausal women.(Korean J Nutrition 34(1):62-68, 2001)

• 대한인간공학회지
• /
• 제33권2호
• /
• pp.143-153
• /
• 2014

Objective: The aim of this study is to investigate the effects of trunk-forearm supported sitting on trunk flexion angle, trunk extensor fatigue and seat contact pressure. Background: The relationship between sitting posture and musculoskeletal disorders of the trunk extensor fatigue and seat contact pressure has been documented. The trunk-forearm support type ergonomic chair was devised from the fact that trunk-forearm support has been reported to reduce trunk extensor activity and discomfort. Method: Using three different sitting postures, upright ($P_1$), trunk-forearm supported ($P_2$) and normal sitting ($P_3$), six healthy subjects participated in the study. Motion capture system was used to collect head and trunk flexion angle, and surface electromyography (sEMG) was used to collect myoelectric signal of upper trapezius, lower trapezius, erector spinae, multifidus, and pressure mat system was used to measure seat contact pressure. Results: When trunk and forearm were supported by the ergonomic chair, higher head flexion angle showed upright > trunk-forearm supported > normal in order, and muscle fatigue showed less than upright and normal sitting. Mean seat contact pressure decreased 19% than upright sitting. But muscle fatigue was not affected by each condition. Conclusion: Trunk-forearm supported sitting of the ergonomic chair showed positive effect in respect of trunk and head flexion angle, trunk extensor fatigue, seat contact pressure. To acquire comprehensive understanding of the effectiveness of the ergonomic chair, further studies such as anatomical effects from measurement of external applied loading effect to the body from interface pressure analysis are required. Application: The results of the publishing trend analysis might help physiological effects of trunk-forearm support type chair.

• 수면정신생리
• /
• 제9권1호
• /
• pp.24-33
• /
• 2002

목 적 : 폐쇄성 수면무호흡증(이하 수면무호흡증) 환자에서 고혈압이 흔히 병발되나 지속적 상기도 양압술(이하 양압술)에 따른 고혈압 해소 정도는 연구방법에 따라 상이한 결과를 보이고 있다. 이에 저자들은 지속적-비관혈적 혈압 측정법을 이용하여 기초 혈압치가 다양한 수면무호흡증 환자군에서 양압술을 적용하면서 야간 수면중 혈압 및 심박 동수 반응에 양압술이 미치는 영향을 연구하고자 하였다. 또한 양압술에 의한 혈역학적 변화에 영향을 줄 수 있는 요인들을 찾고자 하였다. 방 법 : 연구대상으로는 수면무호흡증의 임상 증상을 지니고 있으며 기초 측정일의 야간 수면다원검사 결과 호흡장애지수가 5이상인 환자 10명(평균연령 52.2$\pm$12.4세, 남자 9명, 여자 1명)을 선택하였다. 양압술을 시행하지 않은 상태인 기초 측정일과 양압술을 시행한 양압술 시행일 모두에서 야간 수면다원기록과 동시에 지속적-비관혈적 혈압측정기($Finapres^{(R)}$)를 사용하여 매 박동(beat-to-beat)시의 수축기 혈압, 이완기 혈압, 그리고 심박동수를 측정하였다. 또한 매 2초마다 혈중산소포화도($SaO_2$)를 측정하였다. 기초 측정일과 양압술 시행일 두 군간에 혈역학적 및 호흡기적 변인들의 평균치를 비교하였다. 기초 측정일 값에서 양압술 시행일 값을 뺀 수축기 혈압 델타값 및 이완기 혈압 델타값 각각과 기초 측정일의 측정치들(수축기 혈압, 이완기 혈압, 그 각각의 혈압 변이도, 심박동수 및 심박동수 변이도, 혈중산소포화도 평균치, 그리고 호흡장애지수), 양압술 시행일의 측정치들(양압술 처방압력 및 총 각성시간 분율), 연령, 그리고 비만도 간의 상관관계를 분석하였다. 결 과 : 1) 혈중 산소포화도의 평균치와 호흡장애지수가 기초 측정일에 비해 양압술 시행일에서 각각 증가(p<.01) 및 감소(p<.01)하였으나, 혈역학적 변인을 포함한 다른 비교 변인들에서는 차이가 없었다. 2) 기초 측정일의 혈압에서 양압술 시행일의 혈압을 뺀 델타값들을 분석한 결과 기초 측정일의 혈압치와 대상군의 연령에 따라 혈압 반응이 차별적으로 나타났다. 수축기 혈압 델타값과 기초 측정일의 수축기 혈압간에 유의한 정적 상관관계를 보였으나(p<.01), 이완기 혈압 델타값과 기초 측정일의 이완기 혈압간에는 각성기(p<.01)를 제외한 다른 수면단계에서 유의한 상관관계가 없었다. 렘수면단계를 제외한 모든 수면단계에서 이완기 혈압의 델타값과 연령 사이에 유의한 역 상관관계가 있었지만(p<.05), 수축기 혈압의 델타값과 연령 간에는 유의한 상관관계가 없었다. 3) 수축기 혈압 델타값 및 이완기 혈압델타값 각각과 기초 측정일의 측정치들, 양압술 시행일의 측정치들, 그리고 비만도 간의 상관관계를 분석한 결과, 이완기 혈압 델타값과 양압술 시행일의 각성시간 분율간의 유의한 정적 상관관계(p<.01) 외에는 유의한 상관관계가 없었다. 결 론 : 양압술 적용에 따라 수축기 혈압 델타값과 이완기 혈압 델타값이 기초 측정일의 수축기 혈압치와 대상군의 연령에 따라 각각 증가 또는 감소하였다. 따라서, 본 연구는 양압술에 따른 혈압 반응은 단순 감소로 나타나는 것이 아니라 여러 변인의 조건에 따라 차별적 혈압 반응 양상으로 나타나는 복합적인 현상이며 앞으로 좀더 세밀하게 연구되어야 할 대상임을 시사한다.