<p class="MsoNormal" style="text-justify: inter-ideograph; text-align: justify; margin: 0in 36.1pt 0pt 0.5in; layout-grid-mode: char;"><span style="mso-bidi-font-style: italic;"><span style="font-size: x-small;"><span style="font-family: Times New Roman;">Seat inventory control is an important problem in revenue management which is to decide whether to accept or reject a booking request during the booking horizon in airlines. The problem can be modeled as dynamic stochastic programs, which are computationally intractable in network settings. Various researches have been tried to solve it effectively. Even though dynamic (and stochastic) programming (DP) models can be solved it optimally, they are computationally intractable even for small sized networks. Therefore, in practice, DP models are approximated by various mathematical programming models. In this paper, we propose an approximation model for solving airline seat inventory control problem in network environments. Using Linear Approximation technique, we will transform our problem into a concave piecewise LP model. Based on the optimal solution of ours, we suggest how to implement it for airline inventory control policies such as booking limits, bid-price controls and virtual nesting controls.</span></span></span></p>
The purpose of the study was to measure anthropometry, range of motion, and muscle strength of Koreans with paraplegia, using wheelchairs. The total number of people with disabilities in Korea was 2,618,918, of which 1,223,135 (46.7%) people were with physical disabilities in 2019. For the research, people with paraplegia living in Chungcheongnam-do, Korea were recommended through the disability-related organizations. Totally 77 Koreans with paraplegia participated, out of which 57 participants were men and 20 participants were women in the age group of 30–69 years. There were 82 measurement items categorized into 39 static measurement items, 31 range of motion items, and 12 muscle strength of hand/finger items. The results were presented and analyzed with values in the 5, 25, 50, 75, and 95 percentiles by each item and gender. In the category of basic anthropometric measurements, the horizontal size items of the participants with paraplegia were reported to be larger than those of people without disabilities due to the development of the upper body resulting from wheelchair propulsion movements with some exceptions related to their overall body physiques. In sitting posture, there would be various factors affecting the anterior and lateral maximum/minimum reach measurements such as differences in neurological symptoms according to the spinal cord injury level and daily movement level. The data showed a meaningful difference between men and women in height and flexibility in sitting posture. An independent sample [Formula: see text]-test was also performed between male and female groups. There were differences in the anthropometric values, range of motion, pinch force, and grip force between men and women with paraplegia. The measurement results of anthropometry of hand/foot and muscle strength of hands and fingers of Koreans with paraplegia would be used for designing products for their hands and feet such as hair dryers and tumblers. The results of range of motion measurements would be used as important data for the design and development of wheelchairs for people with spinal cord injury. The measurement results of Koreans with paraplegia would be used as basic data for designing and developing assistive technology and universal products for wheelchair users who work and perform daily activities. The anthropometric measurements of individuals with other subclassifications of disabilities will be necessary in the future study for more detailed implication and application in this field.
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