• Journal of Korean Society for Geospatial Information Science
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• v.18 no.4
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• pp.3-10
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• 2010

In this study, the orbit-based sensor modeling is applied to the digital plotting and the accuracy of digital plotting is analyzed. The KOMPSAT-2 satellite image with orbit-attitude model is used for the analysis. The precise sensor modeling with various combination of parameters is performed for the stereo satellite image. In addition, we analyze the error range of ground control points by applying the result of stereo modeling to digital survey system. According to the result, it is possible to produce digital map using stereo image with a small number of GCPs when the orbit-based sensor modeling for KOMPSAT-2 is applied. This means that it is suitable for the generation of digital map on a scale of 1/5,000 to 1/25,000 considering the resolution of KOMPSAT-2 image.

• Journal of Astronomy and Space Sciences
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• v.23 no.1
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• pp.29-38
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• 2006

This paper presents an Image Motion Compensation (IMC) algorithm for the Korea's Communication, Ocean, and Meteorological Satellite (COMS)-1. An IMC algorithm is a priority component of image registration in Image Navigation and Registration (INR) system to locate and register radiometric image data. Due to various perturbations, a satellite has orbit and attitude errors with respect to a reference motion. These errors cause depointing of the imager aiming direction, and in consequence cause image distortions. To correct the depointing of the imager aiming direction, a compensation algorithm is designed by adapting different equations from those used for the GOES satellites. The capability of the algorithm is compared with that of existing algorithm applied to the GOES's INR system. The algorithm developed in this paper improves pointing accuracy by 40%, and efficiently compensates the depointings of the imager aiming direction.

• Journal of Convergence for Information Technology
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• v.10 no.2
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• pp.176-183
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• 2020

The purpose of this study was to determine whether abdominal pressure belt has an immediate effect on pulmonary function, balance and gait ability for stroke patients. Twenty subjects measured pulmonary function and the COP, BBS, TUG, 10m walk test, and FGA prior to belt wearing. Immediately all subjects were post-tested after wearing abdominal pressure belt of elastic components. Except for forced vital capacity (FVC) and forced experimental volume in the 1 second (FEV1), there were significant differences after belt wearing. This study suggests that the application of abdominal pressure belt enhanced balance and gait ability. However, improving pulmonary function requires several efforts, such as changing the pressure level, posture.

• Journal of Oral Medicine and Pain
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• v.18 no.1
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• pp.9-19
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• 1993

The purpose of this study was to evaluate the effect of craniocervical posture on craniomandibular disorders with chronic headache. The author measured craniocervical posture on frontal and sagittal plane with photographs for 26 headache patients, 23 TMD patients, and 27 nonpatients. Range of cervical spine motion was also measured. The bilateral electromyograms of masseter and anterior temporalis muscles were recorded at rest and during maximum clenching. The results were as follows : On the lateral view photos, eye-tragus-C7 line angle was larger and the tragus-C7-horizontal line angle was smaller in the patient groups than in the nonpatient group (p<0.05). On the frontal view photos, mouth corner line angle was larger in the headache patient group than in the nonpatient group and TMD patient group (p<0.05) Interclavicular angle was smaller in the headache patient group and TMD patient grop than in the nonpatient (p<0.01) The right and left differences of SAIC-plane distance and finger tip-plane distance were significantly larger in headache patient group than TMD patient group and nonpatient group (p<0.01, p<0.001). Cervical motion range was smaller in the TMD patient group and headache patient group than in the nonpatient group (p<-.001, p<0.05, p<0.05). The resting EMG activities of right masseter muscle were higher in the headache patient group than in the nonpatient group (p<0.05). However, the EMG activities of masseter and anterior temporalis muscles during maximal clenching were lower in the patient group than in the nonpatient grop (p<0.01). The asymmetry index of resting EMG of masseter muscles was higher in the headache patient group than nonpatient group (p<0.05).

• Journal of the Korean Institute of Gas
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• v.19 no.5
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• pp.87-97
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• 2015

Accidents of HAZMAT transport vehicle are generally dealt by unskilled firefighters. As a result, firefighters became 2nd victims of accidents in some case because of this reason, and it is required to prepare an accident response guidelines against HAZMAT transport vehicle accidents. In this study, risk assessment methods and making methods of guidelines were investigated to make accident response guidelines of HAZMAT transport vehicle accidents. and It identifies hazards and combines with guideword for making guideline items. At last, we determine criteria or detailed methods by referring survey regulations and existed methods.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.40 no.6
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• pp.506-514
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• 2012

This paper represents a method for designing of path following Line-of-Sight(LOS) guidance law based on vehicle kinematics. In general, a LOS guidance law which is composed of gains and approach length as design parameters is designed by empirical or trial-and-error method. These approaches cannot guarantee a precision tracking performance of guidance law consistently. Also, the design parameters should be redesigned with variations of vehicle maneuverability and flight velocity. Based on a vehicle kinematics with its velocity, the proposed method for designing of parameters not only minimizes the number of design parameters, also has a reliable and consistent tracking performance using variable guidance gain changed in accordance with flight velocity. This is validated by nonlinear simulation with $1^{st}$ order attitude response dynamics and flight experiments with given linear and circular path.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.66 no.2
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• pp.439-446
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• 2017

Portable low-cost Kinect sensor was used to analyze standing balance ability of the elderly. Eighty subjects who can walk alone and have a normal cognitive level participated in this experiment. Based on Berg Balance scale (BBS) test with 52 points, subjects were divided into Healthy older (HO: 46 persons, BBS: $53.80{\pm}1.19$) and Impaired older (IO: 34 persons, BBS: $49.06{\pm}2.03$) group. Each subject performed 30 seconds four different standing balance tests (EO: Eyes Open, EC: Eyes Close, EOf: Eyes Open on foam, ECf: Eyes Close on foam). Five variables (Mean distance, Range of distance, Root mean square, Mean velocity, 95% ellipse area) were calculated from the hip joint center movement of Kinect sensor. Results showed that there were significant differences between groups for four different standing tests. Calculated variables from kinect sensor showed significant correlation with BBS score. Especially, mediolateral mean distance, mediolateral root mean square, mediolateral range of distance and 95% ellipse area showed discriminative ability for all tests. Mean values of variables of IO were higher than those of HO, which means the decreased balance ability in IO compared with HO. Therefore, it was possible to estimate simple balance assessment of the elderly using portable low-cost Kinect sensor.

• Journal of the Korean Society of Safety
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• v.26 no.5
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• pp.81-88
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• 2011

The goal of this study was to determine whether food industry workers are exposed to musculoskeletal loads due to the work time, frequency, awkward postures and inappropriate workspace design. Three catering workers were evaluated based on job analysis and posture analysis. The results showed that the four most time-consuming tasks were arranging(17%), cooking(16%), handling before cooking(15%) and cutting(15%), and the four most frequent tasks were arranging(21%), cooking(18%), handling after cooking(16%) and handling before cooking(13%). The most common posture was a standing posture(73%) with neutral back(73%), and bent head(50%), left lower arm(71%), right lower arm(78%) and right hand(60%). The comparative analysis of subtasks for the risk levels of musculoskeletal disorders was conducted using the work time, frequency and cumulative time of the postures. The 'displaying' and 'handling after cooking' showed higher risk levels than other subtasks. In addition, the height and length of the tables were evaluated to be inadequate for the workers. It can be concluded that the working environments for catering workers of restaurants should be improved due to the high cumulative time of awkward postures of upper extremities.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.10
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• pp.6092-6101
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• 2014

This study examined the job experience of visiting supervisors for multicultural families. To achieve the goal of this study, data was collected by in-depth interviews with 7 visiting supervisors for multicultural families. For an analysis of the data, the grounded theory approach by Strauss and Corbin [11] was employed. The results of an analysis of the categories are detailed below. Through an open coding process, a total of 124 concepts, 33 subcategories, and 13 categories were produced. The central phenomenon was 'uncertain employment '. From the axial coding, the causal conditions were 'employment for economic reasons' and 'frequent policy and regulation changes'. The contextual conditions were 'uneasiness about the evaluation result', 'unilateral work instruction system', and 'little improvement of treatment'. Intervention conditions were 'high level of satisfaction with work', 'handy source of income', and 'no other alternative'. Action/interaction strategies were 'efforts for contract extension' and 'receptive attitude'. The consequences were 'hope to retain employment' and 'agonizing over their rights'.

• Korean Journal of Applied Biomechanics
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• v.24 no.4
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• pp.391-397
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• 2014

The purpose of this work is to biomechanically study the effect of the one leg standing pose in yoga.. The work have been done through the evaluation for the left and right symmetry ability of one leg standing pose in the before and after yoga training for the 14 female yoga subject group (height: $164.3{\pm}4.4cm$, mass: $53.4{\pm}6.4kg$, year: $20.0{\pm}0.49yrs$) participated in this experiment. The motions of one leg standing pose were captured with Vicon system and the parameters were calculated with Visual-3D and Ground reaction force system. The results were as followed; - Front and backward COPsd did not show the significant difference, compared the before training with the after. - Left and right COPsd showed the significant difference (p<0.05), compared the before training with the after. - COP distance showed the significant difference (p<0.01), compared the before training with the after. - The asymmetry index of front and backward COPsd did not show the significant difference, compared the before training with the after. - The asymmetry index of left and right COPsd did not show the significant difference, compared the before training with the after. - The asymmetry index of COP distance showed the significant difference (p<0.01), compared the before training with the after. Therefore, the yoga training demonstrated the stable improvement in the one leg standing pose of inferior feet and the positive effect to the left and right symmetry ability.