• 제목/요약/키워드: Physical work capacity

검색결과 96건 처리시간 0.027초

여자 중 . 고등 학생의 최대 산소 섭취량 (Maximal Oxygen Uptake in the Secondary School Girls)

  • 정일동;남기용
    • The Korean Journal of Physiology
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    • 제2권2호
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    • pp.11-20
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    • 1968
  • Maximal oxygen uptake was measured in thirty-three secondary school girls by means of the treadmill test. Eighteen middle school girls aged 14.0 (range: $13.0{\sim}15.9$) years and fifteen high school girls aged 16.9 (range: $16.0{\sim}18.0$) years served as subjects. Maximal treadmill run lasted for 2 minutes and 20 seconds and the expired air was collected in a Douglas bag through a J-valve during the last one minute period. In general, absolute values of various measurements in the high school girls were greater than those of the middle school girls. When values were expressed on the body weight or lean body weight basis, however, work capacity of middle school girls was superior to that of the high school girls. The detailed results are as follows: 1. In middle school girls maximal oxygen uptake was 1.78 l/min., 47.4 ml/kg body weight, 12.3 ml/cm body height, and 61.7ml/kg lean body mass. In high school girls maximal oxygen uptake was 1.93 l/min., 39.7ml/kg body weight, 12.3 ml/cm body height, and 51.2 ml/kg LBM. Although the absolute value of maximal oxygen uptake was greater in high school girls than in middle school girls, values expressed on the body weight basis showed the reverse trend, namely, values of the middle school girls was greater than those of the high school girls. 2. The ratio of maximal to resting oxygen uptake was 8.8 in the middle school girls and was 10.2 in the high school girls. 3. Maximal pulmonary ventilation in the middle school girls was 55.3 l/min. and 66.1 l/min. in the high school girls. The ratio of maximal to resting pulmonary ventilation was 10.2 in the middle school girls and 10.1 in the high school girls. 4. The correlation between body weight and maximal oxygen uptake was relatively high, namely, r=0.79 both in middle and high school girls. The correlation coefficient between body weight and maximal pulmonary ventilation was a little less that of between maximal oxygen uptake and showed a value of r=0.60 both in middle and high school girls. The lean body mass was a poor reference of maximal oxygen uptake or maximal pulmonary ventilation as compared to body weight. The correlation between maximal oxygen uptake and maximal pulmonary ventilation was high and the coefficient of correlation in middle school girls was 0.927 and in high school girls it was 0.856. 5. Maximal ventilation equivalent was 30.9 liters in middle school girls and 33.9 liters in high school girls. This indicated that no hyperventilation was induced during the maximal of oxygen uptake exercise period as related to the maximal oxygen uptake. 6. Heart rate reached to the peak value within 1.5 minutes after beginning of maximal oxygen uptake run and remained at the same peak plateau level throughout the entire running period. Heart rate decreased steeply on cessation of running and subsided slowly thereafter. The maximal heart rate was 184 beat/min. in middle school girls and 189 beat/min. in high school girls. 7. Maximal oxygen pulse was 9.4 in middle school girls and 9.9 ml/beat in high school girls.

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핵의학과 Video Display Terminals Syndrome 유해 요인 조사 및 개선에 관한 연구 (The Study on Risk Factors Analysis and Improvement of VDT Syndrome in Nuclear Medicine)

  • 김정수;김승정;이홍재;김진의;김현주;한인임;주영수
    • 핵의학기술
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    • 제14권1호
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    • pp.61-66
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    • 2010
  • VDT는 Video Display Terminals의 약어로 시각 표시 단말기를 뜻한다. 최근 핵의학과에 VDT가 대량 보급되면서 점차적으로 사용자들이 늘어남과 동시에 사용 기간이 급증함에 따라 VDT 증후군에 관심이 높아지고 있다. 본 연구는 서울대학교병원 핵의학과를 대상으로 VDT 유해 요인 평가 도구를 적용하여 그 실태를 조사하고 문제점을 발견하여 향후 개선에 관한 방안을 도출함으로써 VDT 증후군에 관한 의식을 정립하고 궁극적으로 예방하는 데 목적이 있다. 서울대학교병원 핵의학과를 본원 핵의학과, 소아 핵의학과, PET 센터의 3개 파트로 분류하고, 2009년 4월 한 달 동안 현재 근무 중인 방사선사 23명을 대상으로 근무 부서를 직접 방문하여 유해 요인을 평가하였다. 평가에 사용한 도구는 원진 노동환경건강연구소의 "VDT작업에 관한 체크리스트"를 적용하였고 VDT 작업 조건, 업무 책상의 조건, 의자의 조건, 키보드의 조건, 모니터의 조건, 작업 자세, 보건 관리 특성, 기타 작업 환경의 8개 부문, 총 55개 항목을 통하여 현장 조사 및 평가하였으며 이에 대한 분석 결과는 한림대학교 성심병원 산업의학과에서 검증하였다. 서울대학교병원 핵의학과의 VDT 작업 조건은 비교적 양호한 수준이었다. 책상의 경우 최근 도입한 경우에는 인체공학적 설계로 사용자에게 적합하였으나 기존 책상의 15%는 기준치에 미달하였다. 의자의 경우는 기준에 적합하였지만 노후화로 인하여 적정 기능을 상실한 것이 5%였다. 키보드는 98%가 기준에 적합하였고 모니터는 화면의 각도 조절은 모두 가능하였지만 위치 조절이 불가능한 것이 38%로 조사되었다. 작업 자세의 경우 부적절한 자세로 장시간 노출되는 경우가 10%였으며 일부 항목에서 기준에 적합하지 않은 것으로 조사되었다. 보건 관리 측면에서도 개선의 여지가 있는 것으로 나타났다. 또한 조명과 온도, 소음, 환기 등 기타 작업 환경은 일부 항목에서 문제점이 발견되었지만 권고치를 충족하였다. 핵의학과 업무는 과거에 비하여 육체적인 업무는 줄었으나, 장시간 정적인 자세로 고도의 정밀도와 집중력을 요구하게 되었으며 이는 필연적으로 VDT 증후군을 유발하는 계기가 되었다. VDT 증후군은 앞으로도 지속적으로 발생할 가능성이 높으며 개선에 대한 경제적 비용이 상당하다는 점과 다양한 발병 요인을 내재하며 본인도 모르는 사이에 발생한다는 점에서 보다 구체적이며 효율적인 관리 체계가 필요할 것으로 판단된다. 핵의학과의 VDT 증후군은 인체공학적 사무 환경의 개선, 업무 절차(procedure)의 개선과 업무의 효율화, 직원간의 협동작업(teamwork) 그리고 규칙적인 운동, 꾸준한 스트레칭 체조와 같은 사용자 스스로의 노력, 지속적인 관심과 작은 노력으로 충분히 개선될 수 있으며 적극적으로 예방할 수 있을 것으로 사료된다. 이것은 쾌적한 업무 환경속에서 사용자의 육체적, 정신적 상태를 최상으로 이끌고 업무 효율성의 증대와 함께 내부 고객 만족도 상승으로 이어질수 있을 것으로 판단된다.

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3-메틸아미노프로필아민과 N-메틸-2-피롤리돈을 포함한 저수계 흡수제의 CO2 포집 특성 (Absorption Characteristics of Water-Lean Solvent Composed of 3-(Methylamino)propylamine and N-Methyl-2-Pyrrolidone for CO2 Capture)

  • 왕슈아이;홍정현;유정균;홍연기
    • Korean Chemical Engineering Research
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    • 제61권4호
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    • pp.555-560
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    • 2023
  • 기존 아민 수용액 기반 CO2 포집 공정을 산업적으로 적용할 경우 CO2 탈거 및 용매 재생에 따른 재생 에너지가 크다는 문제점을 갖고 있다. 본 논문은 CO2에 대한 높은 흡수 용량과 함께 흡수제에 포함된 물의 조성을 낮춤으로써 재생 에너지를 저감할 수 있는 저수계 흡수제를 제안하였다. 이를 위해 본 연구에서는 디아민인 MAPA (3-methylaminopropylamine)와 함께 물의 일부를 대신하여 물에 비해 CO2에 대한 물리적 용해도가 높고 비열이 낮은 NMP (N-methyl-2-pyrrolidone)를 흡수제에 도입하였다. 흡수제의 CO2에 대한 흡수 용량(αrich)과 순환 흡수 용량(Δα) 및 흡수 속도는 충전탑을 이용하여 측정하였다. 2.5M의 MAPA를 포함한 흡수제를 사용했을 경우 NMP가 10 wt% 포함된 경우에 최대 순환 흡수 용량을 얻을 수 있었다. 총괄물질전달 계수는 NMP의 농도가 증가함에 따라 증가하였다. 그러나 0.5보다 더 높은 CO2 로딩 값에서는 NMP의 농도 증가에 따른 물질전달 계수의 증가 폭이 줄어들었다. lean 로딩 값이 낮은 경우에는 점성에 의한 물질전달 저항이 낮아서 NMP 첨가에 따라 총괄 물질전달 계수가 증가하나 로딩 값이 증가함에 따라 흡수제의 점도가 증가하면서 CO2와 MAPA의 확산도가 낮아지며 이에 따라 총괄 물질전달계수가 급격히 감소하였다.

운동훈련(運動訓練)에 대(對)한 심폐기능(心肺機能)의 적응(適應)에 관(關)한 연구(硏究) (Cardio-pulmonary Adaptation to Physical Training)

  • 조강하
    • The Korean Journal of Physiology
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    • 제1권1호
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    • pp.103-120
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    • 1967
  • As pointed out by many previous investigators, the cardio-pulmonary system of well trained athletes is so adapted that they can perform a given physical exercise more efficiently as compared to non-trained persons. However, the time course of the development of these cardio-pulmonary adaptations has not been extensively studied in the past. Although the development of these training effects is undoubtedly related to the magnitude of an exercise load which is repeatedly given, it would be practical if one could maintain a good physical fitness with a minimal daily exercise. Hence, the present investigation was undertaken to study the time course of the development of cardio-pulmonary adaptations while a group of non-athletes was subjected to a daily 6 to 10 minutes running exercise for a period of 4 weeks. Six healthy male medical students (22 to 24 years old) were randomly selected as experimental subjects, and were equally divided into two groups (A and B). Both groups were subjected to the same daily running exercise (approximately 1,000 kg-m). 6 days a week for 4 weeks, but the rate of exercise was such that the group A ran on treadmill with 8.6% grade for 10 min daily at a speed of 127 m/min while the group B ran for 6 min at a speed of 200 m/min. In order to assess the effects of these physical trainings on the cardio-pulmonary system, the minute volume, the $O_2$ consumption, the $CO_2$ output and the heart rate were determined weekly while the subject was engaged in a given running exercise on treadmill (8.6% grade and 127 m/min) for a period of 5 min. In addition, the arterial blood pressure, the cardiac output, the acid-base state of arterial blood and the gas composition of arterial blood were also determined every other week in 4 subjects (2 from each group) while they were engaged in exercise on a bicycle ergometer at a rate of approximately 900 kg m/min until exhaustion. The maximal work capacity was also determined by asking the subject to engage in exercise on treadmill and ergometer until exhaustion. For the measurement of minute volume, the expired gas was collected in a Douglas bag. The $O_2$ consumption and the $CO_2$ output were subsequently computed by analysing the expired gas with a Scholander micro gas analyzer. The heart rate was calculated from the R-R interval of ECG tracings recorded by an Offner RS Dynograph. A 19 gauge Cournand needle was inserted into a brachial artery, through which arterial blood samples were taken. A Statham $P_{23}AA$ pressure transducer and a PR-7 Research Recorder were used for recording instantaneous arterial pressure. The cardiac output was measured by indicator (Cardiogreen) dilution method. The results may be summarized as follows: (1) The maximal running time on treadmill increased linearly during the 4 week training period at the end of which it increased by 2.8 to 4.6 times. In general, an increase in the maximal running time was greater when the speed was fixed at a level at which the subject was trained. The mammal exercise time on bicycle ergometer also increased linearly during the training period. (2) In carrying out a given running exercise on treadmill (8.6%grade, 127 m/min), the following changes in cardio·pulmonary functions were observed during the training period: (a) The minute volume as well as the $O_2$ consumption during steady state exercise tended to decrease progressively and showed significant reductions after 3 weeks of training. (b) The $CO_2$ production during steady state exercise showed a significant reduction within 1 week of training. (c) The heart rate during steady state exercise tended to decrease progressively and showed a significant reduction after 2 weeks of training. The reduction of heart rate following a given exercise tended to become faster by training and showed a significant change after 3 weeks. Although the resting heart rate also tended to decrease by training, no significant change was observed. (3) In rallying out a given exercise (900 kg-m/min) on a bicycle ergometer, the following change in cardio-vascular functions were observed during the training period: (3) The systolic blood pressure during steady state exercise was not affected while the diastolic blood Pressure was significantly lowered after 4 weeks of training. The resting diastolic pressure was also significantly lowered by the end of 4 weeks. (b) The cardiac output and the stroke volume during steady state exercise increased maximally within 2 weeks of training. However, the resting cardiac output was not altered while the resting stroke volume tended to increase somewhat by training. (c) The total peripheral resistance during steady state exercise was greatly lowered within 2 weeks of training. The mean circulation time during exorcise was also considerably shortened while the left heart work output during exercise increased significantly within 2 weeks. However, these functions_at rest were not altered by training. (d) Although both pH, $P_{co2}\;and\;(HCO_3-)$ of arterial plasma decreased during exercise, the magnitude of reductions became less by training. On the other hand, the $O_2$ content of arterial blood decreased during exercise before training while it tended to increase slightly after training. There was no significant alteration in these values at rest. These results indicate that cardio-pulmonary adaptations to physical training can be acquired by subjecting non-athletes to brief daily exercise routine for certain period of time. Although the time of appearance of various adaptive phenomena is not identical, it may be stated that one has to engage in daily exercise routine for at least 2 weeks for the development of significant adaptive changes.

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산지과수(山地果樹)의 재식(栽植)을 위(爲)한 폭약이용(爆藥利用)에 관(關)한 연구(硏究) (Ammonium Nitrate Explosion Technique for the Establishment of Orchard)

  • 유순모;고광출;박무창
    • 한국토양비료학회지
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    • 제12권4호
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    • pp.169-178
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    • 1980
  • 가비중과 경도(硬度)가 높고 공극량(孔隙量)이 적으며 우수계수(透水係數)가 낮은 불량(不良)한 물리성(物理性)을 가진 산지토양(山地士壤)을 개량(改良)하여 과수재배(果樹栽培)에 적합(適合)한 토양환경(土壤環境)을 만들 수 있는 방법(方法)을 구명(究明)하고저 보곡식양토(甫谷埴壤土)(Fine Aquic Fragiudalfs:Planosols)에 인력(人力) 및 폭약(爆藥)(혈당(穴當) 초안폭약(硝安爆藥)3개(個))을 사용(使用)하여 심토파쇄처리(深土破碎處理)를 하고 7개월후(個月后)에 물리성(物理性) 및 생육조사(生育調査)를 한 결과(結果) 다음과 같은 개량효과(改良效果)를 얻었다. 1. 인력(人力) 및 폭파(爆破)에 의(依)한 심토파쇄처리(深土破碎處理)는 가비중 경도(硬度)를 크게 감소시키고 공극량(孔隙量), 투수계수(透水係數) 및 토양(土壤)의 유효수분범위(有效水分範圍)를 증가(增加)시켰다. 2. 물리성(物理性)을 적정수준(適正水準)으로 개량(改良)하는 효과범위(效果範圍)는 4m 간격으로 폭파처리(爆破處理)를 할 경우 토심(土深) 0~60cm에서 반경(半徑) 70cm 까지, 토심(土深) 60~100cm에서 반경(半經) 50cm 까지 였다. 3. 2m 간격으로 폭파처리(爆破處理)를 하는 경우 토심(土深) 0~60cm에서는 주간전역(株間全域), 토심(土深) 60~100cm에서는 반경(半經) 50cm까지 효과(效果)가 있었다. 4. 인력(人力)에 의(依)한 방법(方法)은 처리부분(處理部分)에만 개량효과(改良效果)가 나타나서 단독혈(單獨穴)의 경우 반경(半經) 50cm까지, 연적조구혈(連績條溝穴)의 경우 주간전역(株間全域)에서 효과(效果)가 인정(認定)되었다. 5. 충분(充分)한 강우(降雨)가 있은 72시간후(時間后)에 채취(採取)한 시료(試料)로써 측정(測定)한 포장용수량(圃場容水量)은 개량효과(改良效果)가 적거나 없는 가비중 1.4 이상인 부위(部位)의 토양시료(土壤試料)(Disturbed soils)를 사용(使用)하여 측정(測定)한 1/3 기압(氣壓)의 수분함량(水分含量)보다 낮은 값을 나타내었다. 6. 초년도(初年度) 과수(果樹)의 수고(樹高), 생체중(生體重), 신초장(新梢長)등(等)은 통계적(統計的)인 유의성(有意性)은 없으나 전반적(全般的)으로 볼때 폭파처리(爆破處理)가 인력(人力)에 의한 심토(深土) 파쇄처리(破碎處理)보다 양호(良好)한 편이였다.

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플라스틱칩 결체(結締) 톱밥보드의 기계적(機械的) 및 물리적(物理的) 성질(性質)에 관(關)한 연구(硏究) (A Study on the Mechanical and Physical Properties of Sawdustboard combined with Plastic Chip)

  • 이필우;서진석
    • Journal of the Korean Wood Science and Technology
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    • 제15권3호
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    • pp.44-55
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    • 1987
  • In order to study the effect of sawdustboard combined with plastic chips, 0.5mm($T_1$), 1mm($T_2$), 1.4mm($T_3$) thick nylon fiber. polypropylene rope fiber(RP), and 0.23mm thick moth-proof polypropylene net fiber(NP) were cut into 0.5, 1, 2cm long plastic chips. Thereafter, sawdustboard combined with plastic chips prepared as the above and plastic non-combined sawdustboard(control) were manufactured into 3 types of one-, two-, and three layer with 5 or 10% combination level. By the discussions and results at this study, the significant conclusions of mechanical and physical properties were summarized as follows: 1. The MORs were shown in the order of 3 layer> 2 layer> 1 layer among plastic non-combined boards, and $T_3$ < $T_2$ < $T_1$ < RP (NP(5%) < NP(l0%) among plastic combined boards. In 2cm long plastic chip in 1 layer board, the highest strength through all the composition was recognized. 1 layer board showing the lower strength with 0.5cm plastic chip rendered to the bending strength improvement by 2 or 3 layer board composition. On the other hand, 2 or 3 layer combined with 1, 2cm long polypropylene net fiber chips incurred MOR's conspicuous decrease requiring optimum plastic chip combined level and consideration to combined type. 2. MOE in plastic non-combined 3 layer board exhibited sandwich construction effect by higher resin content application to surface layer in the order of 3layer>1layer>2layer with the highest stiffness of the board combined with polypropylene chip, while nylon chip-combined board had little difference from plastic non-combined board. In relevant to length and layer effect, 3 layer board combined with the 0.5cm long polypropylene net fiber chip in 5% and 10% combined level presented 34-43% and 44-76% stiffness increase against plastic non-combined board(control), respectively. Moreover, in 1 layer board, 30% stiffness increase with 10% against 5% combined level in the 1 and 2cm long polypropylene net fiber chip was obtained. 3. Stress at proportional limit(Spl) showing the fiber relationship (r: 0.81-0.97) between MOR presented in the order of 1 layer<2 layer<3 layer in plastic non-combined board. Correspondingly, combined effect by layer and plastic chip length was similar to MOR's. 4. Differently from previous properties(MOR, MOE, Spl). work to maximum load(Wml) of 2 layer board approached to that of 3 layer board. Conforming the above phenomenon. 2 layer combined with 0.5cm long polypropylene net fiber chip kept the greater work than 1 layer. The polypropylene combined board superior to nylon -and plastic non - combined board seemed to have greater anti - failing capacity. 5. Internal bond strength(IB), in contrast to MOR's tendency. showed in the order of T1

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흑생강(Kaempferia parviflora)의 항응고 및 혈소판 응집저해 활성 (Anti-coagulation and Anti-platelet Aggregation Activities of Black Ginger (Kaempferia parviflora))

  • 이만효;성화정;권정숙;손호용
    • 생명과학회지
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    • 제28권9호
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    • pp.1068-1075
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    • 2018
  • 흑생강은 생강과 초본과 뿌리식물로 태국 및 라오스에서는 크라차이담으로 불리며, 뿌리는 향신료와 차로 이용되어 왔다. 말린 뿌리는 위장장애, 통풍, 이질, 알러지 치료 및 강장용으로 전통적으로 이용되어 왔으며, 최근에는 항비만, 항산화, 항염증, 혈전 용해 활성 등의 다양한 유용 생리활성이 보고되어 있다. 본 연구에서는 흑생강의 혈액순환 개선 활성을 확인하기 위해, 흑생강 지하부의 ethanol 추출물 및 열수 추출물을 조제하고 각각 이의 순차적 유기용매 분획물인 hexane 분획물, ethylacetate (EA) 분획물, butanol 분획물 및 물 잔류물을 조제하여 각각의 성분을 분석하였고, 혈전 생성과 관련된 항응고 활성, 혈소판 응집저해 활성 및 적혈구 용혈활성을 평가하였다. 그 결과, ethanol 추출물의 EA 분획물 5 mg/ml 농도에서 TT, PT, aPTT를 각각 1.22, 1.49 및 15배 이상 연장시켜 강력한 항응고 활성을 나타냄을 확인하였으며, ethanol 및 열수 추출물의 EA 분획물 모두에서 동량의 아스피린보다 강력한 혈소판 응집저해 활성을 확인하였다. 또한 상기 EA 분획물들은 0.5 mg/ml 농도까지 인간 적혈구에 대한 용혈활성을 나타내지 않았다. 본 연구 결과는 흑생강의 혈전 생성 억제 활성에 대한 최초의 보고이며, 흑생강의 EA 분획물이 인간 적혈구 용혈활성 없이 강력한 항응고 및 혈소판 응집저해 활성을 나타내어 신규의 항혈전제로 이용 가능함을 제시하고 있다.

병원의 지식경영 도입방안에 관한 연구 -병원 지식경영 단계모델 구축- (A Study on the Implementation of Knowledge Management in Hospital)

  • 장익선;나정미
    • 경영과정보연구
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    • 제23권
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    • pp.75-97
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    • 2007
  • In the meantime hospital system of Korea has institutionally performed its errand in stable circumstance, however the system now faces with new environment of change of customer's satisfaction, of regime, deepening of competition, and opening market. Under the rapidly and complicatedly changing circumstance, the hospital system is required to promote getting a dominant position in the competition, enhancing outcome, creating value added, and customer satisfaction in both internally and externally likewise other organizations, as they continuously introduce a knowledge management and originate, accumulate, and put the knowledge to practical use. This organization capacity of knowledge management involves a process of management that requires great change of all organizations and individuals and it is brought up through four steps which are Initiation, Propagation, Integration, and Networking. The main factors of successful knowledge management are intension of the chief executive officer(CEO), organizational culture, appraisal and compensation of work, knowledge controlling system, and organizational structure, and each of these five stage has got different characteristic. To be successful by introducing knowledge management, hospital organization should be based on these premises. Not only CEO or the director of a hospital, but also the constituent members should be fully aware of knowledge, the characteristic of knowledge management, and successful factors of this operation. Should understand step-by-step characteristic of knowledge management, therefore able to analyse a situation of specific hospital and see which step corresponds to that hospital. By analysing, constituents should make up for the weak points and ready to move on to next step. CEO or the director of a hospital should be aware of knowledge management as a strategic factor which is able to get a dominant position in the rapidly changing environment, and also it should be firm in the director's intention to introduce the knowledge management into the hospital. By continuously carrying out education and training constituent members, the director of a hospital should promote their interest and participation in knowledge management, and build an organization culture that ultimately creates, accumulates, shares, and put the knowledge to practical use. The hospital organization needs to systematize an institution of objective compensation that corresponds to objective appraisal of knowledge management outcome. The hospital ought to build knowledge controlling system in stages, in order to take the initiative in rapidly changing environment. By considering the characteristic of hospital system, it is required to change the organizational structure into self-managing team which is a sort of horizontal structure that allows members to make decisions and take the responsibility by themselves. The limitation of this study is experimental study. Positive investigation about successful factors of hospital knowledge management and characteristic of each steps is expected with following study.

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가스흡수식 냉방기용 4성분계 작동매체의 물성 향상 연구 (A Study on Improvement of the Physical Properties of 4 Component Working Fluid in Gas Fired Absorption Chillers)

  • 백영순;오영삼;이용원;박달령;구기갑
    • 공업화학
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    • 제10권3호
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    • pp.400-406
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    • 1999
  • 고효율 가스흡수식 냉방기를 위한 신 작동매체로 기존의 $LiBr-H_2O$ 용액에 $LiNO_3$, LiCl, LiI 성분을 첨가하여 4성분 용액을 제조하였다. 본 연구를 통하여 제조된 4성분계의 작동매체에 대한 용해도와 증기압을 측정하여 기존의 $LiBr-H_2O$계와 비교 분석하였으며, 이들에 대한 최적혼합 몰비를 각각 구하였다. 용해도 측면에서 $LiBr-LiNO_3-LiCl$계는 5:1:1~2, $LiBr-LiNO_3-LiCl$계는 5:1:1, LiBr-LiI-LiCl계의 경우 5:1:0.5~1로 나타났다. 한편 $LiBr-LiNO_3-LiCl-H_2O$계를 제외하고 모두 증기압이 $LiBr-H_2O$계에 비해 높게 나타났다. $LiBr-LiNO_3-LiCl-H_2O$계를 이용한 흡수성능 실험시 $LiBr-H_2O$계 보다 우수한 특성을 지녔다.

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한국성인 여성의 혈압수준에 따른 체력의 차이 (The Difference of Fitness according to Blood Pressure Level in Korean Women)

  • 소위영;최대혁
    • 한국노년학
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    • 제29권1호
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    • pp.135-147
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    • 2009
  • 최근 우리나라는 식생활의 서구화와 더불어 운동부족 등으로 고혈압 발병률이 급격히 증가하고 있다. 많은 연구자들은 운동요법으로서의 고혈압 처치 및 예방을 위하여 다각도적인 접근을 시도하고 있다. 그러나 대부분의 연구들이 혈압강하와 관련된 운동의 효과 분석, 운동프로그램의 유용성 분석 등에 한정되어 있으며, 연령별 고혈압여부에 따른 체력의 차이에 대한 분석은 이루어지지 않고 있다. 본 연구자는 국민건강 관점에서 볼 때 연령별 고혈압여부에 따른 체력 수준 차이에 대한 확인은 고혈압 예방 및 처치를 위한 핵심적인 자료가 될 수 있기 때문에 금후에 진행되어야 할 중요한 연구 과제라 생각한다. 따라서 본 연구는 20대 이상의 성인 여성을 대상으로 연령별 고혈압여부에 따른 체력의 차이를 확인하여 고혈압 예방에 대한 체력수준의 중요성을 강조하고자 한다. 또한, 심폐기능의 차이를 추가적으로 살펴봄으로써 보다 가치 있는 연구를 도모하고자 한다. 2004년 1월 2일부터 2008년 9월 31일까지 S시 Y구 보건소 내 건강증진센터를 방문하여 고혈압검사가 포함된 종합검진을 받은 20세 이상의 성인 여성 8889명을 분석대상으로 하였다. 미국 고혈압 합동위원회의 제7차보고서(JNC7)의 고혈압 기준에 따라서 정상군, 조기고혈압군, 고혈압1기군과 고혈압2기군으로 나누었다. 심폐기능의 평가는 안정시심박수와 폐활량으로 체력의 평가는 심폐지구력, 근지구력, 근력, 순발력, 민첩성, 평형성, 유연성으로 하였고, 고혈압 발병에 영향을 미치는 독립 위험변수인 체질량지수, 음주, 흡연을 보정한 공변량분석(ANCOVA)을 이용하여 체력차이를 분석하였다. 연구결과 2가지의 모든 심폐기능 변인, 7가지의 모든 체력 변인에서 대부분의 연령대별로 4집단 간의 유의한 차이가 나타나는 것을 확인하였다. 이를 통하여 정상군에서 고혈압군으로 혈압수준이 높아질수록 낮은 심폐기능과 낮은 체력수준을 소유하고 있는 것을 확인하였다.