• 한국통신학회논문지
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• 제29권8A호
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• pp.928-936
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• 2004

본 논문에서는 IEEE802.11 무선 네트워크 DCF(Distributed Coordination Function) 메커니즘 내에서 시스템 전체의 성능에 영향을 주지 않고, Fairness 문제를 해결하는 방법을 제시한다. 노드간의 채널 공유를 공평하게 하기 위해 간단하고 효과적인 적응 경쟁창 알고리듬을 제안하였다. 먼저 IEEE 802.11 MAC 프로토콜에서 Backoff 알고리듬을 개선하여 Fairness를 나타내는 Fairness Index를 계산하고 이를 이용하여 경쟁창의 크기를 조절한다. 이 알고리듬은 RTS/CTS 메커니즘을 지원하며 히든 노드문제가 발생하는 일부 토플로지에서도 잘 적용된다. 뿐만 아니라 가변 패킷을 지원할 수도 있다. 모의 실험결과 채널 공유가 최대 30%정도 향상되었으며, 이는 제안된 Fairness 알고리듬이 전체적인 성능에 영향을 주지 않고 채널 공유 서비스를 향상시킨다는 것을 보여준다.

• 한국시뮬레이션학회논문지
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• 제20권2호
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• pp.1-10
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• 2011

본 연구에서는 대기행렬네트워크 성과측정 방법 중의 한 가지로서 널리 이용되는 분해법의 구성요소로 제안된 변동성 함수 의 이론적 근거를 살펴보고 성과척도 측정의 정확도 제고를 위하여 회귀분석을 통한 변동성 함수의 모수추정 개선방안을 제안하고자 한다. 이를 위하여 변동성이 높은 도착과정과 서비스 과정이 포함된 직렬 대기행렬 네트워크에서의 이탈과정의 자동상관계수 함수를 추정하여 분해법에 사용할 수 있는 방안을 알아본다.

• 대한임상검사과학회지
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• 제37권3호
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• pp.207-211
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• 2005

Body index is known as it affects pulmonary function tests (PFT), so it has been used with predictive formula and nomogram in terms of sex, age, height, etc. Body indices as body weight, body mass index (BMI), and body surface area (BSA) might also affect PFT, so that we have analyzed the correlations between body indices and forced expiratory volume in one second ($FEV_1$), and have done multiple regression analysis to see how body indices affect $FEV_1$. We confirmed that $FEV_1$ had positive correlations with height (r=0.49, p<0.01), body weight (r=0.37, p<0.01), and BSA (r=0.47, p<0.01), inverse correlation with age (r=-0.45, p<0.01), but no correlation with BMI. We found that the 41.9% of $FEV_1$ was diverged from height, age and BSA. Therefore, BSA definitely needs to be considered with predictive formula and nomogram in PFT.

• 한국환경과학회지
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• 제32권10호
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• pp.713-722
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• 2023

This study was conducted to examine the effects of care farming activities on the brain waves of adults with developmental disabilities from September 2022 to December 2022, with a total of 16 sessions held once a week. For 28 adults with developmental disabilities, 15 participants in the care farm program and 13 participants who did not participate were used as the control group. Before and after the care farming activities, participants' self-esteem, happiness levels, and brain function indices were measured through surveys and electroencephalography (EEG). Consequently, the self-esteem of the participants in the experimental group significantly increased after the activity, and as for the brain function index, the left brain activity index related to stress, attention, brain function, and emotional state increased compared to the control group in the experimental group of adults with developmental disabilities, especially intellectual disabilities. Notably, the effect of care farming activities was greater for women than for men with intellectual disabilities. Therefore, considering the differential effects of care farming activities based on the type of developmental disability and sex, it is deemed advantageous to primarily apply these activities to women with intellectual disabilities in order to maximize the healing effect of care farming.

• The Journal of Korean Physical Therapy
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• 제24권5호
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• pp.291-299
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• 2012

Purpose: This study examined the improved sensory, hand function, postural balance and activities of daily living (ADL) through somatosensory stimulation, such as the facilitation of functional reaching and tactile, proprioceptive stimulus of the upper limb (UL) and hand. Methods: Seventeen stroke patients having problems with motor and somatosensory deficits were selected in Bobath Memorial Hospital adult rehabilitation center. The patients were divided into two groups; the sensorimotor deficit group (SMDG) and motor deficit group (MDG). Somatosensory stimulation on the UL, physical therapy and occupational therapy were carried out three times a week over a six week these treatments were performed in both group period. To compare each group, the following assessment tools were used: such as tactile detection thresholds (TDT), two point discrimination on the affected side (TPDas), unaffected side (TPDus) stereognosis (ST) manual function test, hand function on the affected side (HFas) and unaffected side (HFus), Postural Assessment Scale for Stroke (PASS) and Korean version Modified Barthel Index (K-MBI). Results: In the SMDG, somatosensory stimulation on the UL was statistically important for TDT, TPDas, TPDus (except for the thener), ST, hand function on HFas, on HFus, PASS length of displacement with foam (LDFSEO), and K-MBI. In the MDG, somatosensory stimulation on the UL was important for TDT, TPDas, TPDus (except index finger) length of displacement with the eyes open, LDFSEO, HFas, HFus, PASS and K-MBI. In addition, there was a significant difference in the PASS between SMDG and MDG. Conclusion: Somatosensory stimulation on the UL affects the sensory, hand function, postural control and ADLs performance.

• 물과 미래
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• 제19권2호
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• pp.139-148
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• 1986

침투효과과 큰 산지 소유역은 사면류가 유역내의 주된 흐름이 되며, 강우일유출의 수문응답은 사면길이의 분포특성으로 나타낼 수 있다. 유역의 지형특성은 홍수도달시간으로 표현되며, 홍수도달시간에 확률밀도함수를 적용시키면, 강우, 유출의 응답함수인 순간단위도를 구성할 수 있다. 서면길이와 관측된 홍수도달시간의 확률분포를 비교해 본 결과 형상계수가 거의 일치하였다. 이는 서면의 특성이 도달시간으로 집약되어 나타나는 것을 의미하며, 서면의 특성치로서 유출에 대한 응답함수를 구성할 수 있음을 나타낸다. 특히, 유역내 유출의 평균화를 시도하기 위해서 소류역내 분수계르르 기준으로 다수의 분할 소구역으로 나누어 전체소유역과 분할소구역의 서면특성치를 비교 분석하였다. 응답함수에 의해 유도되는 직접유출수문곡선을 유효강우량의 산정 방법에 따라 그 재현정도가 달라진다. 본 논문에서는 Horton의 침투 eq.을 이용 기본 방정식을 재구성하였고, $\Phi$-index 법과 직접유출수문곡선의 재현성을 비교 검토하였다.

• 한국산학기술학회논문지
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• 제20권2호
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• pp.311-320
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• 2019

본 연구는 남성 간경변 환자의 성기능, 수면의 질, 우울 간의 관계를 확인하기 위한 서술적 연구이다. 대상자는 간경변을 진단 받고 외래 추적 관찰 중인 환자 144명으로, 자료 수집은 구조화된 설문지를 이용하여 2017년 8월 16일부터 2018년 1월 30일까지 실시하였다. 성기능은 Rosen 등이 개발한 International Index of Erectile Function의 한국어 번안한 것을 이용하여 측정하였고, 수면의 질은 Buysse 등이 피츠버그 수면센터에서 개발한 Pittsburgh Sleep Quality Index의 한국어 버전을 사용하여 측정하였다. 우울은 Beck Depression Inventory-II를 한국어로 번안한 한국어판 BDI-II 도구를 사용하였다. 분석은 t검정, 분산분석, 상관관계분석을 이용하였다. 연구 결과 남성 간경변 환자들의 성기능이 낮을수록 수면의 질이 낮고(r=-.232, p=.005) 우울 점수가 높았으며(r=-.381, p<.001), 수면의 질이 낮을수록 우울 점수가 높게(r=.561, p<.001) 나타났다. 대상자들의 성기능, 수면의 질, 우울은 통계적으로 유의한 상관관계가 있는 것으로 나타났다. 본 연구 결과는 남성 간경변 환자를 위한 간호 중재 개발의 기초 자료로 활용 될 수 있을 것이다.

• 한국수자원학회논문집
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• 제47권2호
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• pp.171-182
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• 2014

본 연구에서는 가뭄해석을 위한 이변량 결합가뭄지수를 산정하고 국내 활용성을 평가하였다. 이변량 결합가뭄지수 산정을 위해 결합분포함수는 Clayton copula, 매개변수 추정은 교정방법을 이용하였으며, 입력변수로는 1977~2012년 동안의 강수량 및 토양수분량 자료를 선정하였다. 우리나라에 대한 이변량 결합가뭄지수를 산정한 후, 기존 가뭄지수인 SPI 및 SSI와 같이 시계열 분석, 지역별 분석 및 ROC 분석을 수행하여 활용성을 평가하였다. 분석결과 SPI는 가뭄의 시작, SSI는 가뭄의 해갈을 적절히 고려하였으며, 이변량 결합가뭄지수는 SPI 및 SSI의 거동 특성을 적절히 반영하는 것으로 나타났다. 또한 이변량 결합가뭄지수가 SPI 및 SSI에 비해 ROC score가 높게 산정되었으며, 지역별 분석에서도 지역의 가뭄 상황을 적절히 재현하여 활용성이 우수하게 나타났다. 이변량 결합가뭄지수는 기존 가뭄지수의 해석적 한계를 보완하였다는 측면에서 국내 가뭄해석의 활용성이 높다고 판단된다.

• 한국환경복원기술학회지
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• 제21권1호
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• pp.119-132
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• 2018

This study was conducted to suggest an assessment indices to evaluate the ecosystem services of the unique functions of wetlands as well as economic value provided by the village wetlands. The assessment indicators applied in this study were used by the RAM indices. The results of RAM assessment on the village wetlands in Cheonan city were analyzed by item and critical functions of the village wetland. They were derived by assessment indicators of ecosystem services, and the village wetland ecosystem were presented by Focus Group Interview (FGI). The 20 critical indices were selected from 52 different indices by analyzing the wetland function assessment items. 13 indicators excluding duplicate indexes by function, were selected as ecological service impact indicators. Finally, ecosystem services were evaluated by using AHP analysis to calculate the weight of each assessment indices and apply it to the 9 village wetlands. The results of this study confirmed that the functions of the village wetlands are compliant with the ecosystem services. Based on this assessment of the unique functions of wetlands, it will serve as a methodology for assessing ecosystem services. The study was also conducted on 49 wetlands in Cheonan. The detailed assessment of wetland ecosystem services based on the wetland ecosystem function proposed by this study, was further developed as a follow-up study. It suggested that the wetland areas should be compared and be used as a general standard. In addition to the assessment of the economic value of ecosystem services provided by the village wetlands, it would be useful to assess the unique features and convert them into value.

• PNF and Movement
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• 제14권3호
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• pp.185-193
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• 2016

Purpose: The purpose of this study was to investigate the effects of neck patterns in proprioceptive neuromuscular facilitation (PNF) for neck movement and the neck disability index (NDI) among adults with forward head posture. Methods: Thirty-nine subjects were randomly assigned into two groups. Subjects in the proprioceptive neuromuscular facilitation exercise group (PNFG, n = 20) received 20 minutes of PNF neck pattern (flexion-Rt. lateral flexion-Rt. rotation followed by extension-Lt. lateral flexion-Lt. rotation) 3 times weekly for 4 weeks. Outcomes were measured using absolute rotation angle (ARA), anterior weight bearing (AWB), range of flexion and extension motions (RFEM), and neck disability index (NDI) methods before and after the 4-week intervention period. Results: There were significant effects for the PNFG, pre- and post-intervention, in ARA, AWB, RFEM, and NDI. There were significant differences in ARA, AWB, RFEM, and NDI compared with CG. Conclusion: The results of this study suggest the PNF neck pattern could be beneficial for adults with forward head posture.Purpose: This study investigates how abdominal muscular exercise based on proprioceptive neuromuscular facilitation (PNF) can affect chronic low back pain patients in terms of their pulmonary function, pain, and functional disability indexes. Methods: Fourteen target subjects with chronic low back were randomly assigned to the control group (n = 7) that performed abdominal muscle exercises and the experimental group (n = 7) that performed PNF abdominal muscular exercises. The exercises were performed five times a week for six weeks. To check the change in pulmonary function, the forced expiratory volume at one second (FEV1) and visible analogue scale (VAS) were measured to check the pain level. The disability level caused by back pain was measured by the Oswestry Disability Index (ODI). A paired t-test was applied to compare the differences between the groups before and after the intervention, and an independent t-test was used to compare the differences between the groups. The level of statistical significance was set as ${\alpha}=0.05$. Results: Before and after the intervention, the experimental group showed a significant change in FEV1 (p < 0.01), and both the experimental and the control groups showed significant changes in VAS and ODI (p < 0.01). A comparison of the differences between the groups indicated that the experimental group showed more significant changes in FEV1 (p < 0.05). Conclusion: According to the study results, PNF abdominal muscular exercise effectively improved pulmonary function, pain, and functional disability indexes in subjects with chronic back pain. The proposed program can be applied to chronic back pain patients as a useful therapy.