• 수산해양기술연구
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• 제32권2호
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• pp.125-131
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• 1996

In order to investigate the relation between the environmental properties and the catch fluctuation of set net fishing grounds located in the coastal waters of Yosu, oceanographic observations on the fishing grounds were carried out by the training ship ofYosu Fisheries University from January, 1990 to September, 1992, and the data obtained were compared with the catch data from the joint market ofYosu fisheries cooperative society from 1984 to 1993. The resuItes obtained are summerized as follows : 1. The ranges of water temperature and salinity in the fishing ground was 7.0 to $27^{\circ}C.$and 26.6 to 33.2${\textperthousand}$, and water temperature increased from March to August and decreased from September to February of following year. 2. The salinity in the fishing grounds was relatively high without significant changes from November to June of the following year. From July, however, the salinity decreased to continue a low value till September and then increased. The salinity in the fishing ground was dominated mainly by the precipitation and its variation was large at the north entrance of set net fishing ground, influenced greatly by the land waters from the river of Somjin, but small in the offshore of the fishing grounds. 3. The fishes caught by the set nets were arranged in order of catch as follows; Spanish mackerel> Horse mackerel > Sardine > Anchovy > Hair tail. The catches of Anchovy and Sardine were high in April to May and those of Hair tail in June to July, but Spanish mackerel and Horse mackerel were caught for whole period of fishing. Spanish mackerel was caught most in September and least in April and their means were largest in August and smallest in June. 4. The ranges of optimum water temperature for fishing by the set nets was 13.5 to $25^{\circ}C.$, and in the ranges the catches increased with increasing temperature. The ranges of optimum salinity for fishing varied between 25.0 and 32.0${\textperthousand}$.

• 신경치료
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• 제22권3호
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• pp.19-23
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• 2018

Purpose The purpose of this study was to investigate the change of balance ability by performing closed chain exercise on stable support surface and unstable support surface in twenties. Methods This study randomly selected 15 students in the closed chain exercise group on the stable support side and 15 on the closed chain exercise group on the unstable support side. Balance ability was measured before and after the start of exercise and static balance was measured by OLT(One Leg Standing Test) and FRT (Functional Reach Test). Result The changes of the function reach test of the closed chain movement according to the ground type were significant in the unstable and stable support surfaces and the change of function reach test after the intervention in the two groups was significantly improved compared with the closed chain movement respectively. The one leg standing test changes of the closed chain movement according to the ground type showed significant results on the unstable and stable support surfaces, but there was no significant difference in the one leg standing test changes after intervention between the two groups. Conclusion The effect of closed chain training on ground type is unstable. The change of function reach test and one leg standing test of the closed chain exercise group on the stable support surface resulted in significant changes after exercise, but there was a significant difference in the balance ability of function reach test change after intervention between the groups.

• 대한통합의학회지
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• 제11권2호
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• pp.207-219
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• 2023

Purpose : This study was conducted to investigate the changes in trunk movement and ground reaction during sit to stand motion using visual feedback. Methods : Fifteen adults (average age: 23.53±1.77 years) participated in this study. An infrared reflective marker was attached to the body each participant for motion analysis, and the participants performed sit to stand motion while wearing a hat attached with a laser pointer, which provided visual feedback. First, the sit to stand action was repeated thrice without obtaining any visual feedback, followed by a three minute break. Next, the laser pointers attached to hats were irradiated on a whiteboard, located at a distance of 5 m in front of the chairs, on which the participants sat; a baseline was set, and the participants performed stand up movements three times under this condition. A visual feedback was provided to the participants to prevent the laser pointers from crossing the set baseline. During each stand-up movement, the position of the reflective marker attached to the subject's body was recorded in real time using an infrared camera for motion analysis. The trunk movement and ground reaction force were extracted through recorded data and analyzed according to the presence or absence of visual feedback. Results : The results indicated that in the presence of a visual feedback during the sit-to-stand movements, the range of motion of the trunk and hip joints decreased, whereas that of the knee and ankle joints increased in the sagittal plane. The rotation angle of the trunk in the horizontal plane decreased. The left and right movement speed of the center of pressure increased, the pressing force decreased, and the forward and backward movement speed of the trunk decreased. Conclusion : The results suggest that the efficiency and stability of the stand up movement of a body increase when a visual feedback is provided.

• 터널과지하공간
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• 제33권3호
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• pp.126-140
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• 2023

본 연구에서는 석회석 광산에서 발생한 지반침하지에 대해 라이다 기반 정밀 형상 모델을 활용하여 침하 원인을 분석하였다. 드론 및 지상 기반 라이다 시스템을 활용하여 침하지 지표 및 갱도에 대한 정밀 형상 모델 구축을 수행하고 현장 지질조사 및 암반 분류 결과를 활용하였다, 정밀 형상 모델을 통해 침하지 주변부 크라운필러 두께 및 단층 분포, 침하지 및 침하 적치물 부피 계산, 침하 지표 경사 분석을 수행하였다. 이와 같은 분석을 통해 석회석 광산에서 발생한 지반침하 원인을 규명하였다.

• 한국운동역학회지
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• 제21권3호
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• pp.383-390
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• 2011

In this study, 26 normal subjects were studied to compare the biomechanical Analysis of Lower Limbs on Speed of Nordic Walking. The biomechanical variables were determined by performing three-dimensional gait analysis, and the measurements items were spatial and temporal parameters; vertical ground reaction force; and moments of the hip, knee, and ankle joints. The purpose of this study based on the speed of Nordic Walking to the vertical ground reaction force and joint moments of each were analyzed. Nordic Walking with poles while being whether this weight is reduced to load, not the improvement of muscle activity by identify Nordic walking is to allow efficient. The results of the analysis were follows. The spatial parameters of step length, stride length significantly increased with increase in velocity(p<0.001). The temporal parameters of step time, stride time, the duration of double support use, and the duration of single support use also significantly decreased with increase in velocity(p<0.001), but cadence significantly increased(p<0.01). Analysis of the changes in ground reaction force revealed that vertical ground reaction force significantly increased at the initial contact and the terminal stance and decreased at the mid stance with increase in velocity(p<0.001). Moments of the hip and knee joints significantly in creased with increase in velocity whereas that of the ankle joint did not. Gait analysis revealed that weight-bearing decreased and moments of the hip and knee joints increased with increase in velocity(p<0.01). The results of this study may help people perform Nordic walking efficiently and Nordic walking can be used in the gait training of people with an abnormal gait.

• PNF and Movement
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• 제18권1호
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• pp.65-75
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• 2020

Purpose: The purpose of this study was to investigate the differences in muscle thickness and ground reaction force of the vastus medialis oblique and vastus lateral oblique muscles during squats at ankle angles of toe 0°, toe in 10°, and toe out 10°. Methods: In this study, 9 male and 17 female students in their 20s participated in a randomized controlled trial and were compared according to the ankle angles of toe 0°, toe in 10°, and toe out 10°. To determine the reliability and measurement of muscle thickness according to ankle angle using ultrasound equipment and muscle thickness, the participants' ankle angles-toe 0°, toe in 10°, and toe out 10°-were measured three times at the vastus medialis oblique and vastus lateralis oblique muscles during squats. At the same time, the maximum vertical ground reaction force was measured with a force plate. A total of three measurements were taken and averaged, and two minutes of squat movements were assessed between ankle angles to prevent target action. Results: The results of this study illustrated that the reliability of the vastus medialis oblique muscles and vastus lateralis oblique muscles in ankle angle was high. The difference in muscle thickness was significantly greater in comparing the toe out 10° angle with the toe 0° angle than between toe in 10° and toe out 10° in vastus medialis oblique and vastus lateralis oblique (p < 0.05). There was no statistically significant difference between the ankle angle of toe 0° and toe in 10° (p > 0.05). The maximum vertical ground reaction force was significantly greater at toe out 10° than at the ankle angle of toe 0° and toe out 10° and between toe in 10° and toe out 10° (p < 0.05). There was no statistically significant difference in the comparison between toe 0° and toe in 10° (p > 0.05). Conclusion: Squatting at an ankle angle of toe out 10° increases the dorsi flexion; thus, the stability of the ankle and the thickness of both oblique muscles increased to perform more effective squats. In addition, as the base of support widens, it is thought that the stability of the posture increases so that squat training can be performed safely.

• 동양고전연구
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• 제68호
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• pp.379-408
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• 2017

본 논문은 인성교육 문제에 대한 대안을 고민하는 입장에서 다산(茶山) 정약용(丁若鏞)(1762-1836)이 저술한 "소학지언(小學枝言)"의 수신론에 관한 견해를 윤리학적 문제를 중심으로 살펴봄으로써 도덕 교육적 함의를 도출하고자 한다. 동양철학에서 수신론은 인성론의 토대 위에서 이루어진다. 다산의 수신론 역시 그의 인성론을 토대로 하고 있으며, 성리학적 수신론과의 차별성은 실천을 중시하는 그의 수신론(修身論) 속에 반영되어 있다고 볼 수 있다. 다산은 성리학적 수양론(修養論)이 내적으로 마음을 관조하는 정적(靜的)인 수양론임을 비판하면서 덕(德)은 구체적 실천을 통해 비로소 이룰 수 있음을 강조하는 입장에 서 있다. 다산의 수양론이 성립되는 근거는 그의 성기호설(性嗜好說)에 있다. 다산은 인간에게 주어진 성(性)을 인의예지(仁義禮智)의 본성으로 보지 않고, 선(善)을 좋아하는 기호(嗜好)로 보고 있기에 인간에게는 본래 완전한 본성이나 이(理)가 주어져 있는 것이 아니라 발휘되어야 할 지향성이 있을 뿐이며, 그 지향성의 함양을 통한 덕(德)의 형성은 수신론(修身論)으로 이어진다고 할 수 있다. 다산은 "소학" '소도(小道)를 따르고 소예(小藝)를 익히는 것'으로서 학문적인 추구보다 오히려 가까운 현실로부터 실천을 통해 인격을 성숙시키는 도덕실천서로서의 성격을 지닌다고 보고 있다. 이러한 입장 속에서 다산은 "소학지언(小學枝言)" 저술 전체를 관통하여 정확한 훈고(訓?)와 고증(考證)을 바탕으로 의리(義理)를 추구하고자 하는 경전해석 태도를 유지함으로써 권형(權衡)의 행사(行事)를 드러내고 있다. 또한 그는 "소학지언(小學枝言)"에서 성기호설(性嗜好說)을 바탕으로 한 본연성(本然性)을 함양하며, 윤리적 존재로서의 관계성을 인식하고, 자학(字學)과 도학(道學)의 조화을 추구하는 전인교육의 기준을 제시하고 있다. 따라서 "소학지언(小學枝言)"에는 그가 추구하는 실천 중심의 도덕교육 철학이 구현되고 있다고 볼 수 있다.

• 항공우주정책ㆍ법학회지
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• 제35권3호
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• pp.95-126
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• 2020

2017년 우리나라에서 세계 최초로 수면비행선박인 위그선(WIG, Wing In Gound)의 조종사 면허 필기자격시험을 시행하였다. 수면비행선박은 선박과 비행기의 특성을 융합한 차세대 운송수송 수단이어서 항공기 조종사 자격증명과 6급 이상의 항해사 면허를 함께 보유한 자만이 해당 조종사에 지원할 수 있도록 하였다. 수면비행선박 조종사 면허제도는 우리나라가 처음 도입한 것이어서 면허 제도와 체계에 대한 국제적 표준은 아직 없고, 국내 자격제도 도입 역시 여러가지 개선사항이 요구된다. 해외에서도 현재까지 개발 중이거나 상용화 성공사례를 손으로 꼽을 정도이나 우리나라에서 국제적인 선박 공인 기관인 한국선급에서 2020년 3월에 정식으로 선급 인증을 하였다. 법적인 정식 명칭은 "수면비행선박"이고 항공기와는 이미 국제법적으로 분류가 되어 차세대 운송수단으로 주목을 받고 있었다. 그러나 이런 미래의 해양의 성장 동력으로서 가치가 있는 산업이 되기 위해서는 시급한 몇가지 문제점을 해결하여야 하는데 수면비행선박 인력 양성이 바로 그것이다. 하여 본 주제인 조종사 양성에 관한 제도적인 문제를 검토하였다. 2001년부터 세계 여러 나라들이 IMO를 중심으로 논의를 하였고 우리나라도 IMO 회의에 지속적으로 참가 및 공조하여 드디어 2011년부터 수면비행선박 국가자격시험을 시행하였다. 그러나 아직 풀어야 할 문제점이 있어 인력양성 제도선행, 교육훈련 제도, 지정교육기관 제도 등으로 제시하였다. 그에 관한 해결방안으로 면허제도 개선을 통한 방안과 지정교육기관 운영을 통한 방안으로 제시하였다. 이 방안 중에 지정교육기관 운영은 정부가 민간교육기관에게 위탁하는 방안이 가장 합리적인 방안으로 판단된다고 제언하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.367-371
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• 2004

This paper describes development of automatic flight control system for an unmanned target drone which is operated by Korean army as for anti-air gun shooting training. Current target drone is operated by pilot control of on-board servo motor via remote control system. Automatic flight control system for the target drone greatly reduces work load of ground pilot and can increase application area of the drone. Most UAVs being operated now days use high-priced sensors as AHRS and IMU to measure the attitude, but those are costly. This paper introduces the development of low-cost automatic flight control system with low-cost sensors. The integrated automatic flight control system has been developed by integrating combining power module, switching module, monitoring module and RC receiver as an one module. The performance of automatic flight control system is verified by flight test.

• Structural Engineering and Mechanics
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• 제52권1호
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• pp.97-113
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• 2014

In the present work appropriate concrete material models have been proposed to predict drying shrinkage and specific creep of High-performance concrete (HPC) using Artificial Neural Network (ANN). The ANN models are trained, tested and validated using 106 different experimental measured set of data collected from different literatures. The developed models consist of 12 input parameters which include quantities of ingredients namely ordinary Portland cement, fly ash, silica fume, ground granulated blast-furnace slag, water, and other aggregate to cement ratio, volume to surface area ratio, compressive strength at age of loading, relative humidity, age of drying commencement and age of concrete. The Feed-forward backpropagation networks with Levenberg-Marquardt training function are chosen for proposed ANN models and same implemented on MATLAB platform. The results shows that the proposed ANN models are more rational as well as computationally more efficient to predict time-dependent properties of drying shrinkage and specific creep of HPC with high level accuracy.