• Journal of the Institute of Convergence Signal Processing
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• v.16 no.4
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• pp.168-174
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• 2015

The ultimate purpose of a walking robot is to move to a designated spot and to perform a necessary manipulation. To perform various manipulations for a walking robot, it should have some kind of an extra manipulator. However, if the manipulation task for the robot is simple enough, the robot can perform the task by using its legs. Among various kinds of walking robots, a hexapod walking robot has relatively many legs, so it has the advantage of stability and walking speed. So, a hexapod walking robot can perform simple manipulation task by using its one or two legs while maintaining stability by using the rest of legs. In this paper, we deal with a simple manipulation task of holding a ball. We formulate the task as a redundancy resolution problem and propose a method for obtaining an optimal solution.

• Journal of the Earthquake Engineering Society of Korea
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• v.12 no.1
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• pp.57-66
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• 2008

An experimental study was performed to evaluate seismic reduction performance and applicability of 3-dimensional floor isolation system to the main control room of nuclear power plant. A friction pendulum system(FPS) and air spring were designed and fabricated for 3-dimensional floor isolation system. Two kind of the partial experimental model of a main control room attached to the FPS and air spring were tested on the shaking table. The experimental model consisted of a control panel, a $2.5m{\times}2.5m$ access floor, four FPS and air springs. The artificial time histories based on the vertical and horizontal floor response spectrums(OBE, SSE) of the main control room were used as the earthquake input signals in the test. Compared to non-isolated system, the seismic response of experimental models using 3-dimensional floor isolation system were shown considerable seismic reduction performance.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.518-518
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• 2015

이 연구에서는 ESRI사의 ArcGIS 프로그램을 이용하여, 한반도 남한지역 중 기후변화시나리오에 의한 강수량이 제공되지 않는 해안선지역에 대해 기후변화시나리오를 이용하여 장래 강수량을 생성할 수 있는 모형을 개발하였다. 기상청에서 제공하는 기후변화 시나리오에 의한 장래강수데이터의 경우 복잡한 해안선지역에 대해 장래 강수데이터를 제공하고 있지 않기 때문에 최근의 지형도를 적용하여 기상청에서 제공하지 않는 지역에 대해 보완격자를 생성하고, 공간보간 기법을 이용하여 이를 해결할 수 있다. 1km 격자단위의 강수데이터를 생성하기 위하여 GIS내에 여러 툴(tools)의 기능을 단계적으로 모형화하여 순서화된 작업을 자동적으로 수행할 수 있는 model builder를 사용하였다. 데이터 변환작업을 위한 전처리, 데이터 보간 추출 기능과 공간보간기법을 적용하여 기후변화 시나리오가 적용된 데이터누락지역에서의 장래 강수예측데이터를 생성할 수 있도록 하였다. 기상청에서 제공하는 RCP 8.5 시나리오를 이용하였고, 일부 해안선과 섬 지역에 대해 장래강수량을 생성할 수 있는 보간기법이 적용된 모형으로 한반도 남한지역 중 강수자료가 제공되지 않는 총 4,186개의 격자에 대해 적합한 공간보간기법을 선택하여, 일단위 및 월단위 강수자료를 생산할 수 있도록 하였다. 기상청에서 제공하는 강수데이터의 경우 'ASCII' 파일 형식으로 기후변화 데이터를 제공하기 때문에 사용자가 별도의 프로그램을 이용하여 강수예측자료를 얻어야 하는 문제가 있다. 강수예측자료를 텍스트파일 형태로 사용자가 원하는 좌표를 선택 한 후 데이터를 추출할 수 있도록 격자화하여 저장되도록 하였다.

• The Journal of the Convergence on Culture Technology
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• v.5 no.4
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• pp.439-444
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• 2019

In this paper, the seismic performance evaluation of the subway lines 1~4 conducted from April 2010 to October 2013 for the existing structures that were not seismically designed based on the seismic design criteria of urban railways was studied. The detailed design of seismic reinforcement for the facilities requiring seismic reinforcement was summarized through the detailed design of the seismic reinforcement construction conducted from March to December 2018. As a result of the evaluation, 53.2km (total project cost of 322 billion won) of 141.5km of Lines 1~4 were considered to require seismic reinforcement, and finally, the company aims to secure a 100% earthquake-proof rate to withstand earthquake-scale 6.5 by 2020. This paper can be used as basic research data to evaluate and reinforce seismic performance of urban railways in the future.

• The Journal of the Convergence on Culture Technology
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• v.5 no.4
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• pp.401-406
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• 2019

The three-dimensional precision numerical analysis was performed using the finite element model applied with the railway track model consisting of rails, sleepers, and track elastic springs(ballast, rail pad). As a result of analyzing the track deformation level of the existing tracks due to the excavation work adjacent to the railway facilities, it was found that the track irregularity evaluation criteria (allowed values) of both conventional and high-speed railways lines were satisfied. Based on the numerical analysis using the track model, it was analyzed that the results of the prediction of the track irregularity due to the excavation work and the level of the track deformation occurring at the actual site could be approximated as closely as possible.

• Journal of the Korea Organic Resources Recycling Association
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• v.27 no.1
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• pp.33-38
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• 2019

This study refers to the deodorization of DDM Environmental Resource Center, which is operating abnormally in the food waste public-resource facilities that are operating nationwide, in accordance with the initial operating conditions. Issues concerning the abnormal deodorization facilities of DDM Environment Resource Center were the deodorization of composting facilities, indoor air quality problems, and overall deodorization of facilities, especially the phenomenon of stopping while operating the RTO and the phenomenon of poor spray in the wet scrubber etc. As an alternative and improvement method for converting such abnormal operation facilities into normal operation facilities, It is proposed to remove the front filter of the upper part of the fermentation tank, and to install scrubbers, air and water separator, and roll filters for dust removal etc.

• Journal of the Korea Convergence Society
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• v.9 no.11
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• pp.363-369
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• 2018

The purpose of this study was to investigate the differences of lumbar muscle activity (LMA) and oxygen consumption (OC) according to bike saddle height in healthy young men. Twenty-two subjects without musculoskeletal disorders participated in this study. Subjects performed 3 min cycling at 3 different saddle heights with 10 minutes of resting time respectively. Surface EMG was used to assess muscle activity in LMA, and OC was assessed by potable gas analyzer. In the result, there was a statistically significant difference in internal oblique abdominis activity (p<0.05), and the OC was significantly higher in high saddle height than the optimal and the low position of the saddle (p<0.05). This study suggest that changes in saddle height affected internal oblique abdominis activity and OC in subjects, however, saddle height does not have much effect on lumbar stabilizer muscle.

• Journal of Korean Academy of Medicine & Therapy Science
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• v.10 no.2
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• pp.47-57
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• 2018

Objective: The purpose of this study was to compare the effects of exercise program combined with spaced retrieval and exercise program to show the effects on elderly people with dementia by presenting them to clinics and welfare facilities such as long-term care facilities. Method: This study was conducted in 20 elderly patients with dementia and randomly assigned to exercise program combined with spaced retrieval and exercise program. After screening the subjects for compliance with the criteria, Before starting the experiment, activites of daily living, depression, and nitive evaluation were performed. After 8 weeks, 3 times per week, 40 minutes per intervention, and 4 and 8 weeks, respectively K-MBI, GDSSF-K and MMSE-K were used to evaluate the differences between the experimental and control groups. Results: There was no statistically significant difference in the daily activities, depression, and cognitive scores between the groups of exercise program combined with spaced retrieval and exercise program group. However, there was a significant difference between the two groups after training (p<.05). Particularly, there was statistically significant difference in post-training cognitive evaluation (MMSE-K) only in the exercise program combined with spaced retrieval group (p<.05) Conclusion: This study suggests that exercise program combined with spaced retrieval is more effective in improving cognitive ability. This suggests that the exercise program combined with spaced retrieval is more effective.

• The Journal of the Convergence on Culture Technology
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• v.4 no.4
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• pp.413-418
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• 2018

The purpose of this study is to investigate the cause of rail corrugation and the track force for concrete track (STEDEF) in the urban transit. From the field measurements, the dynamic wheel load, vertical displacement of sleeper and rail bending stress were measured and it was evaluated by regarding to the rail corrugation. As a result of the study, the causes of rail corrugation was experimentally proved by frequency analysis using measured dynamic wheel load data. The influence of corrugation on dynamic wheel load, rail bending stress and sleeper displacement was evaluated that the periodic irregularities of rail corrugation on the rail surface amplified the dynamic track force such as the dynamic wheel load, and thus the rail bending stress and the vertical displacement of sleeper could be increased by a maximum of 1.7 times.

• Journal of the Korea Convergence Society
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• v.10 no.10
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• pp.33-41
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• 2019

This study aimed to investigate the convergence relationship between kinesiophobia and fear of falling in patients with stroke. A total of 113 patients with stroke participated in this study. Participants underwent inpatient rehabilitation and completed surveys with three different questionnaires including the fall efficacy scale (FES), translated Tampa Scale for Kinesiophobia 13 (TSK-13), and activity-specific balance confidence scale (ABC). TSK-13 and FES showed weak negative correlation (r=-0.226), and TSK-13 and ABC showed moderate negative correlation (r=-0.300). FES had a very strong positive relationship compared with ABC (r=0.838). Faller showed significantly low FES and ABC scores compared with non-faller (p<0.05). These results present that patients with stroke had mild kinesiophobia, and kinesiophobia is related to fear of falling. It is necessary to evaluate kinesiophobia in stroke rehabilitation.