• PNF and Movement
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• 제19권3호
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• pp.435-440
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• 2021

Purpose: The purpose of this study is to investigate the effects of older adult's head-turn gait on gait parameters by comparing with head oriented forward gait and to provide criteria for their risk of falling compared to young adult. Methods: The subjects were 19 young adults in their 20s and 18 older adults in their 60s or above residing in Daegu or Gyeongsangbuk-do. To evaluate their gait parameters, spatiotemporal gait parameters were measured using a gait analysis tool (Legsys, BioSensics, USA) under two conditions: 1) walking while keeping one's eyes forward and 2) walking while turning the head. The measurement for each test was performed after one practice session, and the mean value of three measurements was analyzed. The collected data were statistically processed using a two-way analysis of variance (ANOVA) to compare any differences in gait parameters between the two groups under the two conditions. The statistical significance level was set at α=0.05. Results: According to the comparison of gait parameters in young adult and older adult between the head oriented forward gait and head-turn gait, statistically significant differences were observed in two parameters: stride length according to the height ratio and stride speed obtained by dividing the stride length according to the height ratio by time (p<0.05). Conclusion: The results of this study indicate that the head-turn gait causes greater differences in stride length and speed among older adult than in young adult and therefore can act as a cause of falling.

• 대한중풍순환신경학회지
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• 제14권1호
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• pp.49-60
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• 2013

■ Objectives The aim of this study is to analyze the change of gait pattern by the taping therapy in a hemiplegic patient. ■ Methods We conducted the taping therapy for 7 days to affected ankle joint of hemiplegic patient and analyzed the change of gait pattern using Treadmill Gait analysis equipment(Zebris Co.Ltd FDM-T) ■ Results In terms of affected side, cadence, total double support, step length and stance phase decreased, while swing phase and step time increased by taping therapy. In terms of unaffected side, step length increased by taping therapy. Center of pressure intersection point moved to posterior and affected side in cyclogram pattern. ■ Conclusion Taping therapy to affected ankle joint of hemiplegic patient would be advantages to gait improvement in hemiplegic patients.

• 대한중풍순환신경학회지
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• 제14권1호
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• pp.90-101
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• 2013

■ Objectives The goal of this study was to observe the gait patterns from a patient with Parkinson disease under three different walking speeds. ■ Methods The patient walked on a treadmill and we measured gait parameters using a treadmill gait analysis system for 2 minutes. The Parkinson patients walked under three different conditions, first, at the preferred walking speed, second, at slower speed than the preferred walking speed, and, third, at faster speed than the preferred walking speed. ■ Results In terms of temporal gait parameters, as speed of treadmill increased, stance phase and total double support decreased, and swing phase increased. In terms of spatial parameters, as speed of treadmill increased, step and stride length increased. In terms of kinetic parameters, max pressure increased as speed of treadmill increased. ■ Conclusion According to different walking speeds, some gait parameters of spatiotemporal and kinetic was changed.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2022년도 학술발표회
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• pp.457-457
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• 2022

최근 기후변화로 인한 위기가 인류의 생존을 위협하면서 전 지구적으로 기후변화에 대응하기 위한 탄소 중립 대책을 모색하고 있으며, 지속가능한 신재생에너지에 대해 주목하고 있다. 산업통상자원부는 2034년까지 총 발전량 중 신재생에너지의 비율을 25.8%까지 증가시키는 것을 목표로 신재생에너지의 발전 비율을 증가시키기 위한 다양한 노력을 기울이고 있다. 특히, 신재생에너지 중 가장 많은 비중을 차지하고 있는 태양광 발전은 비교적 광범위한 부지를 필요로 하고 있으며, 환경 및 지형적 영향이 크게 작용하는 만큼 발전 시설 부지 선정 및 운용 계획을 위한 면밀한 분석이 필수적이다. 그러나, 태양광 발전 활용 계획을 수립하기 위해 고려할 수 있는 지상 관측 일사량 및 일조량 데이터는 상당히 제한적이며 관측 밀도가 조밀하지 않다는 한계점이 있다. 본 연구에서는 천리안위성의 후속으로 발사된 천리안2위성의 산출물인 일사량 데이터를 활용하여 한반도 영역에서의 일사량에 대한 시·공간적 분석을 수행하였으며, 이를 기반으로 각 지역적 특성을 파악하고, 토지 피복 유형에 따른 태양광 발전의 효율 정도를 분석·평가하였다. 본 연구의 결과는 계측 지역 및 미계측 지역에서의 시공간적인 태양광 에너지의 효율성에 대한 정보를 제공함에 따라 태양광 발전을 위한 관련 시설물들의 최적 설치 위치 및 규모 등에 대한 설계 기준 마련에 활용될 수 있을 것으로 판단된다.

• 대한환경공학회지
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• 제39권11호
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• pp.641-649
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• 2017

본 연구에서는 오염원의 변화 특성이 다양한 임진강유역을 대상으로 통계분석을 이용하여 상관분석, 주성분 및 요인분석, 군집분석을 통해 수질특성을 파악하였다. 신천3 지점의 평균 수질농도가 BOD 13.4 mg/L, COD 19.9 mg/L, TN 11.145 mg/L, TP 0.336 mg/L, TOC 14.2 mg/L로 높게 나와 전체 유역 중 신천 유역에 대한 집중적인 수질관리가 필요한 것으로 나타났다. 전체 수질측정 자료의 상관분석 결과 COD는 TOC, BOD, TN 수질인자와 유의한 상관관계를 보여 유기물과 영양염류인자간의 상관성이 높은 것으로 나타났다. 주성분분석 결과 전체 측정소 자료는 81.221%로 2개의 주성분, 계절별 자료는 96.241%로 3개의 주성분이 추출되었다. 요인분석 결과 전체 측정소 자료와 계절별 자료의 수질영향 요인은 공통적으로 BOD, COD, TN, TP, TOC 항목이 나타났다. 시 공간적 군집분석 결과 계절별 특성 및 토지이용에 따라 각각 4개, 3개 그룹으로 나타났다. 본 연구는 임진강유역을 중심으로 8년간 시 공간적 특성을 고려한 수질 요인을 분석한 것으로 향후 유역환경변화에 따른 임진강 유역의 수질 변화를 이해하기 위한 기초 분석 자료가 될 것이다.

• 대한토목학회논문집
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• 제39권3호
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• pp.461-467
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• 2019

IoT (Internet of Things) 기술과 위치기반 기술의 발전은 대용량의 이동데이터를 급속하게 생성하고 있다. 대용량 이동 데이터의 분석은 도시 이동의 흐름 및 교통 계획 등에 활용되고 있다. 본 연구에서는 불규칙한 공간적 및 시간적 해상도의 택시 승차 정보로부터 빈번 승차 패턴을 분석하였다. 택시 승차 지점을 중심으로 군집 분석을 실시한 후 군집분석에 기반한 영역을 기준으로 순차패턴 분석을 적용하여 택시 승차 지점이 빈번하게 일어나는 패턴을 분석하였다. 실험용 데이터는 서울특별시 택시 운행 정보로부터 아침 출근 시간인 7시부터 9시 사이의 승차 정보를 분석하였다. 분석 결과는 아침 출근 시간대에 가장 빈도가 높게 발생하는 승차 순차 패턴은 강남 지역 안에서 많이 발생하였으며 지역과의 연계에 있어서는 강남으로부터 서울 시청 지역으로의 이동이 많이 발생하였다. 또한 본 연구는 순차 패턴 분석을 위한 기본 단위로 행정동 경계를 기준으로 분석하였다. 하지만 행정동 경계 기반의 분석은 지역간의 이동 패턴을 찾기가 어려웠다. 본 연구 결과는 향후 택시 공차율 감소와 도시 흐름관리를 위하여 활용할 수 있을 것으로 사료된다.

• 대한한방내과학회지
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• 제37권6호
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• pp.990-997
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• 2016

Objectives: This study observed changes in gait pattern according to the motor grade of the paretic lower limb in patients with basal ganglia stroke who are in the subacute phase. Methods: We used the Manual Muscle Test (MMT) to evaluate the motor grade of the paretic lower limb of 21 patients with subacute basal ganglia stroke and then divided them into two groups based on the MMT results. Stroke patients with a motor grade above Gr. III were put in group I (15 people) and those with a grade less than Gr. III in group II (6 people). We also estimated spatiotemporal factors using treadmill gait analysis equipment. The values were gait velocity, step length, step time, double support phase, and cadence. The first measure was conducted during the early period of admission and the second was between four and five weeks after admission. Results: In Group I, the gait velocity and step length of both legs significantly increased. In Group II, the step length and step time of the paretic side and the gait velocity tended to decrease, but not significantly. The step length of the paretic side in Group II was significantly longer than that in Group I at the first measure. The step time of the paretic side in Group I was significantly shorter than that in Group II and gait velocity and cadence in Group I were significantly higher than in Group II at the second measure. Conclusions: The gait parameters of all stroke patients improved in terms of time. In addition, the changes in gait pattern were different depending on the motor grade of the paretic lower limb.

• 한국환경보건학회지
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• 제42권1호
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• pp.1-9
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• 2016

Objectives: Personal exposure to air pollution is affected by contact over time and by location. The purpose of this study was to determine the relationship between personal exposure to $PM_{2.5}$ and the time-activity patterns of the elderly in urban and rural areas. Methods: A total of 44 elderly participants were recruited for a 24-hour $PM_{2.5}$ personal exposure measurement. Twenty-four were from Seoul (urban area) and 20 were from Asan (rural area). Energy expenditure and spatiotemporal positioning were monitored through $PM_{2.5}$ measurement. Spearman correlation analysis was conducted to determine the relationship between $PM_{2.5}$ and time-activity pattern. Results: Daily average $PM_{2.5}$ personal exposures were $19.1{\pm}9.7{\mu}g/m^3$ in Seoul and $29.1{\pm}16.9{\mu}g/m^3$ in Asan. Although outdoor exposure was higher in Seoul than in Asan, residential indoor exposure was higher in Asan than in Seoul. Higher $PM_{2.5}$ personal exposure in Asan could be explained by longer time in residential indoor environments and higher indoor $PM_{2.5}$ concentrations. Seoul elderly had higher energy expenditure, which may be due to the use of mass transportation. Conclusion: Personal exposure to $PM_{2.5}$ was higher among Asan elderly than Seoul elderly because of high residential indoor concentrations and longer residential time. Lack of energy spent and higher personal exposure to $PM_{2.5}$ might have led to higher risk among the Asan elderly.

• 한국수산과학회지
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• 제48권6호
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• pp.960-968
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• 2015

This study examined the spatiotemporal distribution of demersal fish aggregations in the Northern East China Sea by conducting a trawl survey with hydroacoustic devices. A bottom trawl was used for this survey and fish density was determined from the catch data. Acoustic data were collected at frequencies of 38 and 200 kHz from November to December 2014 and converted into the nautical area scattering coefficient (NASC, $m^2/n{\cdot}mile^2$). In the catch data analysis, the range of catch per unit area by station was $26-8,055kg/km^2$ and for the acoustic data, that of the NASC was $0.45-34.80m^2/n{\cdot}mile^2$. The values were significantly correlated. The combined results of both surveys found that the density was highest at St. 5 ($33^{\circ}$ 10.3', $126^{\circ}$ 23.3') and lowest at St. 8 ($33^{\circ}$ 20.7', $127^{\circ}$ 36.3'). The application of hydroacoustic methods offers a new approach for estimating the biomass of demersal fish aggregations.

• Ocean and Polar Research
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• 제30권2호
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• pp.181-191
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• 2008

This study aims at assessment of spatio-temporal distribution of demersal fish aggregations near the west coast of Jeju Island using hydroacoustic survey. A 200 kHz split beam transducer attached to a small towed body was used for all acoustic investigations. The received acoustic data were in situ acoustic target strength (TS, dB) for all pings and nautical area scattering coefficient(NASC, $m^2/mile^2$) for 0.1 mile along 12 acoustic transects. Demersal fish aggregations are distributed around the coastal slope having 20 to 30 m depth throughout all seasons. The concentration is higher during the summer season. With regard spatial distribution, higher demersal fish aggregations have been detected near the West coast of Shinchang and especially near Chagwi-do. Pelagic fish aggregations were higher to the south of Chagwi-do during the spring season. Additionally, standing stock of demersal fish aggregations from the NASC data, TS function, and length-weight function of dominant species was estimated as follows: 3.2 ton (CV 21.8%) in December 2006, 17.9 ton (CV 21.6%) in April 2007, 30.8 ton (CV 17.8%) in June 2007, and 22.5 ton (CV 24.2%) in October 2007. The application of hydroacoustic methods offers a new approach to understanding spatiotemporal structure and estimate the biomass of demersal fish aggregations in the coastal area. And the results can be made up limitations of qualitative analysis through net and diving for fisheries resources survey in coastal area.