• 한국수자원학회논문집
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• 제30권4호
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• pp.401-409
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• 1997

본 연구는 하천 및 저수지의 하상변동을 예측하기 위하여 하천을 단일 수로로 취급하였으며 저수지는 몇 개의 수로로 나누어 유량의 합성모형, 2차원 분류모형 및 1차원 밀도류모형을 이용하였다. 수치모형은 유량의 연속방정식과 운동량방정식을 double-sweep method로 유량과 수위의 변동량을 구한 후, 수위 및 유량의 변동량을 유사의 연속방정식에 적용하여 하상의 세굴 및 퇴적으로 인한 하상고의 변동량을 예측하였다. 본 연구대상 구역은 보성강댐에서 주암댐의 상류지역인 문덕교까지 약 31km구간을 선정하였으며 하천이 약 13km, 저수지 부분이 약 18km이다.

• 한국환경과학회지
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• 제22권3호
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• pp.291-301
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• 2013

Sediment from the upstream channel has been deposited near the Nakdong River Estuary Barrage (NREB) due to the mild slope and decreased velocity. The annual mechanical dredging to ensure the flood capacity has been performed to remove the deposited sediment. However, the dredging method is not considered as an effective countermeasure due to high cost and long time to operate. Therefore, many methods for sedimentation reduction have been proposed for NREB. Especially, the channel contraction method to mitigate sedimentation problem by changing the channel geometry from 2 km to 3 km upstream of NREB has been recently suggested as an effective countermeasure. However, there is the possibility that the channel contraction method induces flood level increase compared to original condition. Therefore, it is necessary to investigate quantitatively the flood level changes in the upstream and downstream section due to the channel contraction method for NREB. In this study, water level changes by 10% channel contraction of whole width has been evaluated using the HEC-RAS model and simulated with and without channel contraction for various flood discharge. As a result, water level in the section where the channel was contracted was decreased by 0.02 m and flood level at the upstream of channel contracted was increased up to 0.015 m for the 500-year flood.

• 기본간호학회지
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• 제4권1호
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• pp.43-60
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• 1997

This study was to identify the nursing intervention method in finding out the incidence, risk factor, prevention and treatment of bed sore cilents who received regional home care nursing services. The eleven home care nurse practitioners took the survey on 97 patients who received home care nursing service from Seoul City Nurses Association for one month from September 26 to October 26 1996. A modified version of Braden's bed sore assessment tool for bed sore risks and a tool for assessment of bed sore stage and measurement bed sore sizes by Bergstrom, Braden, Laguzza and Holman(1987) were as research tools for this study and a questionnare with 40 questions and 12 items on nursing activities was used to find out the prevention and treatment of bed sores. Also, two open ended questions were used on current approaches and efforts of the treatment being applied to clients. The finding of the study were summarized as following : 1. The rate of bed sore occurrence was 47.4% 2. The areas of bed sore occurrence were hip(28.9%), sacrum(18.6%), great trochanter(14.4%) and the average number of sore spots were 2.26 3. Two groups-one with bed sores and the other without-were studied to determine prediction factors for bed sore risks. Sensory function, humidity, level of activity, mobility, nutrition, skin friction and chapping and body temperature turned out to be statistically significant factors for bed sores. Also the age of clients turned out to be a individual characteristic variable significantly affecting the rate of bed sore occurrences. 4. The education for clients and family on systematic skin assessment and bed sores and practice of active/passive R.O.M. are mainly used as nursing activities for bed sore care. 5. The treatment method varied by stages of bed sores. Sometimes folk remedies like applying the powders of dried elm tree roots to sores were used. Good nutrition, frequent position change and skin care turned to be the most effective means to fast recovery of sores.

• The Journal of Korean Physical Therapy
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• 제23권2호
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• pp.61-68
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• 2011

Purpose: The purpose of this study was to provide basic data for the effectiveness and the necessity of home visiting physical therapy through examining performance ability and functional changes in daily life activities by investigating the life of disabled persons living at home. Methods: After selecting 100 people with physical disabilities greater than level 3 and brain damage related disabilities living in Youngam-Gun, we conducted mobility tests according to a Modified Bathel Index (MBI), the Berg Balance Scale (BBS), and floor and bed movements? for Activities of Daily Living evaluation. We did this before the experiment and after doing home visiting physical therapy for 90 minutes at a time, once a week for 6 months Results: 1) Persons who live in a bed are higher than those who live in a floor. There was a significant difference between persons who live in a floor and those who live in a bed in the change in MBI and BBS scores after home visiting physical therapy. 2) Those with a musculoskeletal disorder had a significantly different change in MBI and BBS according to the type of disease and kind of disability. Those with neuropathy had a significantly different change in MBI. Those with physical disabilities showed a significant difference in MBI and BBS. Conclusion: A home visiting physical therapist can cause an improved performance ability and lead to the ability of disabled persons living at home to carry out activities of daily livingin a large part and the study for brain lesion disabilities except physical disabilities and stroke which occupy large proportion of disabled persons should be done.

• 한국습지학회지
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• 제13권2호
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• pp.329-341
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• 2011

본 연구는 경기도 파주시에 위치한 문산천의 유사량을 직접 실측하여 유사특성을 분석하고, 이를 수치모형에 적용하여 장기적인 하상변동을 예측하였다. 직접 실측된 유사랑을 이용하여 유량-총유사량 관계식을 유도하였으며, 기존의 추정공식을 통해 산정된 총유사량과의 비교를 통해 적절한 유사량 추정방법을 평가하였다. 실측에 의한 문산천의 연간 총유사량은 5,478ton/year, 비유사량은 29.23ton/$km^2$/year로 나타났으며, 기존의 공식과 비교한 결과 Ackers & White공식이 실측치와 매우 유사한 값을 산정하였다. 실측된 유사량 및 지형, 수문자료를 입력변수로 하여 HEC-6와 GSTARS 모형을 비교, 평가하였다. 이를 통해 HEC-6 모형이 문산천의 장기하상변동 예측에 적합한 모형으로 신뢰할 수 있는 결과를 도출할 수 있다고 판단하였으며, 본 연구의 장기하상변동 예측에 적용하였다. HEC-6 모형을 이용한 장기하상변동 예측결과 문산천의 경우 하류부에서는 지속적으로 퇴적이 나타나고 상류부에서는 전반적으로 침식이 발생하였으며, 향후 20년 후의 하상상태로 안정화 될 것으로 판단되었다. 하상 변동량은 20년동안 1m 이내로 유의한 수준에 있다. 그러나 감조부의 영향을 받는 하류부에서는 유출구로부터 2,000m~7,000m 사이의 구간에 퇴적이 지속적으로 증가하고 있어 향후 하천관리계획 수립시 고려해야 할 것으로 판단되었다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2011년도 추계학술대회 논문집
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• pp.101-106
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• 2011

In the present paper, the phenomena of abnormal noise and vibration due to acoustic resonance of CFBC(Circulating Fluidized Bed Combustion) boiler was presented. The acoustic resonance which occurred in the gas path of CFBC boiler system was caused by coincidence of vortex shedding frequency of tube bank and acoustic natural frequency of duct and hopper. And, the phenomena of beating arose from the interference of two closed resonant waves at 66.4Hz and 70.8Hz. There are two control methods for acoustic resonance in this system. The first method is to change the vortex shedding frequency from the structural alterations on the tube bank. And the second method is to change the acoustic natural frequency of the gas path with the installation of anti-noise baffles. The second one which is relatively easy to apply, was adapted in this study. As a result, the noise and vibration level have been decreased by 41dB and 94% at 66.4Hz, respectively. And the improvement of noise and vibration at 70.8Hz was identified by sensory evaluation.

• 한국산학기술학회논문지
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• 제16권2호
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• pp.1500-1506
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• 2015

하천의 본류와 지류가 만나는 합류부 구간에서 시작된 두부침식은 시간에 따라 지류 상류로 전파될 수 있으며, 급격한 하상저하로 인해 지류에 설치된 수리구조물의 안정성을 위협할 수 있다. 이러한 두부침식의 피해를 사전에 방지하기 위해서는 발생원인과 그 메커니즘에 대한 정량적 분석이 반드시 필요하다. 따라서 본 논문에서는 개수로 실험 장치를 이용하여 비점착성 유사로 이루어진 하상에서의 두부침식에 관한 수리실험을 수행하였으며, 수리 조건에 따른 천급점 이동 및 최종 하상경사 변화 등을 분석하였다. 분석 결과, 상하류단의 유속차가 2.5배 큰 조건에서 천급점 이동이 약 1.5배 더 빠르게 진행되는 것으로 나타났으며 좌안과 우안에 비해 중앙의 침식 및 붕괴가 먼저 발생하는 것으로 나타났다. 또한 상 하류단 유속차가 클수록 두부침식 이동길이가 길어지고 더 완만한 하상경사가 나타나는 것을 확인하였으며 본 실험에서는 수위차의 경우 유속차에 비해 상대적으로 두부침식 이동성 및 하상경사에 미치는 상관관계가 일정하지 않는 것으로 나타났다.

• 대한토목학회논문집
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• 제8권3호
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• pp.61-71
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• 1988

본 연구에서는 하상이 경년별로 변화함에 따라 발생되는 수위-유량 관계곡선의 오차를 보완코자 현 하도상태에 대한 기준 수위-유량 관계곡선을 개발하여 일원화시키고, 과거의 하상상태와 경년별로 작성되어 왔던 수위-유량 관계곡선들과의 관계 및 수위, 단면적, 유속 등에 대한 수리기하학적 특성을 분석하였다. 연구의 대상지점으로는 한강 종합개발 사업 이후 하도단면이 크게 변화된 안도교지점을 택하였으며 개발 이후의 현 단면(1987년)을 동적평형 상태로 가정하여 분석을 진행하였다. 1987년도의 유량측정 자료를 이용하여 기준 수위-유량 관계곡선을 개발하고, 과거의 실측유량값을 현 상태하에서의 유량으로 환산하였을 때 얻어지는 수위(환산수위)와 과거수위와의 관계 및 환산유속과 과거유속간의 관계 그리고 수위-통수단면적 관계, 수위-유속 관계 등의 상관식을 유도하여 기왕의 많은 자료들을 앞으로도 활용할 수 있도록 상관해석 하였다.

• 한국유체기계학회 논문집
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• 제18권6호
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• pp.57-62
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• 2015

The test of comparing liquid flow calibration system (approved by KOLAS) for accuracy and structure change test was performed in the test bed in order to evaluate the typical characteristics of the electromagnetic flow meters and parshall flume that are generally used in the water discharging facilities. The results of the accuracy comparing test with liquid flow calibration system showed the error of less than 2%. Pharshall plume got error up to -8.3% (low flow) from the flow rate test, but less than 4% from the accumulated flow test because of offset error at high flow rate and low flow rate. Evaluation of structual change test was tested with only parshall flume using structure and it consisted of installation angle (parshall flume and level sensor) and position change. Installation angle, water level sensor angle and position changing test for parshall flume had errors of 3.1%~-9.2%, 0.4%~-5.6% and 0.2%~1.3% respectively. Especially, the error showed the largest increase when the water level sensor measured the point of decreased flow by the structure change. Therefore, error factors (change of straight pipe length, installation of obstacle or effect of foreign substances on water level sensor) that can often occur in the field should be derived and the research for optimized installation method should be carried out continuously.

• 대한간호학회지
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• 제4권3호
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• pp.93-104
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• 1974

Regardless of a patient's diagnosis, the care of his skin has been a primary concern of nurses throughout the years. Nurses has washed, dried, and rubbed the skin and have changed his position so as to keep the patient's skin in good condition and to protect him from pressure sores. However, we still find many-patients suffering from the pressure sores which may take many mothers or years of treatment and cost a lot to be repaired. In view of expensive cost for treatment of the sores and low ratios of nursing staff per patient for intensive nursing care, prophylaxis of the bed sores with sufficient aids is extremely important both for patients and for nurses. Therefore, the unique purpose of this study was to determine whether sponge is good enough to treat and prevent the pressure sore as compared with gel pad and sheepskin. Sixty patients in the age range of 15 through 45 who were in unconscious status or have difficulty of mobility were chosen between January and March of 1974 at Seoul National University Hospital. They were randomly assigned to each treatment and observed on every 4th day with regard to level of consciousness, status of mobility, moisture or dryness of the bed, general skin condition, intake of nutrition, vital signs and intervals of position change in comparison with the changes of skin over the bony prominences. The study results were reviewed in a statistical method analysis of valiance-to obtain the following findings: 1. There was no significantly different changes of skin over the sanctum or the trochanter in each group using get pad, sheepskin or sponge. It means that we may substitute sponge for expensive gel pad or sheepskin. 2. There was no significant difference among mean changes of patient's skin in relation to sheepskin, gel pad and sponge. 3. There was no significant changes of patient's akin in relation to level of consciousness, status of mobility, intake of nutrition, general skin condition, temperature, blood pressure or interval of position change. 4. There were no meaningful interactions between each treatment and level of consciousness, moisture or dryness of the bed, intake of nutrition, general skin condition, temperature or blood pressure. 5. Sheepskin and gel pad had significantly better influence on patients with limited mobility than on patients with immobility, and sponge on patients with immobility on than patients with limited mobility, 6. Sheepskin and sponge had meaningfully totter influence on patients changing position at below 2-hour interval, gel pad at 2-4-hour interval, sheepskin at 4-6-hour interval, and three of them at above 6-hour interval.