With the rapid development of modern information society, all types of advertisements emerge in an endless flow, where ambient media that emphasizes the multi-sensory experience of users rise as the ...times require. In this paper, based on the price stepping algorithm, a new ambient media advertising model based on O2O that integrates offline large-screen resources is proposed to further promote the development of ambient media in modern society. By introducing the price stepping (PPA) algorithm for sales and management analysis and sensitivity evaluation of actual goods, we aim to dynamically solve the marketing and inventory decision problem of environmental media advertising products, and on this basis, we use the price stepping (PPA) algorithm to make sales forecasts for high-cost goods, provide decision support for inventory and theoretical balance, and achieve theoretical maximization of environmental media advertising. The simulation results show that the PPA algorithm provides a more accurate sales forecast for high-cost goods, which in turn provides a joint decision idea to achieve inventory optimization and profit maximization, and provides an optimization method for merchants to balance inventory costs and marketing costs to maximize profits.
The isometric mid-thigh pull (IMTP) is commonly used to measure isometric strength of characteristics of weightlifters. The isometric pull from the start position (IPSP) has not been studied as much ...as the IMTP but may potentially be a viable option for a weightlifting monitoring program. This study aims to compare isometric force-time characteristics from both the IMTP and IPSP to weightlifting competition performance. Collegiate weightlifters’ performances were compared to isometric peak force (IPF), rate of force development (RFD), and allometrically scaled peak force (IPFa) of both isometric testing protocols by a Pearson’s Correlation Coefficient. Strong correlations between weightlifting performance and force-time characteristics for both protocols were found with IPSP having slightly higher correlations. This suggests that both isometric testing protocols are viable tools for predicting weightlifting performance. It may be useful to include both protocols in a weightlifting monitoring program.
There are two major lifts in weightlifting competition: the snatch and the clean and jerk. Most studies have focused on the snatch technique using conventional motion capture systems. There is a lack ...of information on the bilateral comparison of body segment movement during the entire phases of the weightlifting exercises. To our knowledge, no previous studies have directly compared the joint kinematics between the snatch and clean lifts. In this study, we investigated the trunk, shoulder, elbow, hip, and knee joint movements to find a difference between the snatch and clean lifts at each phase using wearable inertial sensors. Seven female Mongolian weightlifters participated. Each participant performed three snatches and three clean lifts at 70% of the one-repetition maximum. The joint angles were calculated using raw data from the inertial measurement unit (IMU) sensors. The main phases of the two techniques were defined based on knee and shoulder angle. The mean joint angle, the joint angle at each phase, and the proportion of the phases were compared between the two techniques. The mean angles of the trunk, shoulder, and elbow movements were significantly different (p < 0.05) while the hip (p = 0.73) and knee movements (p = 0.06) were similar. With detailed statistical analysis at each phase, subtle differences in the joint angles were observed. This study provides a detailed comparative analysis of the joint kinematics between the snatch and clean, which may help to deeply understand the similarities between the two techniques and enable us to best prescribe the appropriate exercises for improving weightlifting performance.
Background: Monitoring and evaluation of the techniques used in weightlifting are based on the subjective observation of the coach, which can ignore important aspects of short duration. This study ...aimed to implement an embedded system to register the angular variation of the hip, knee, and ankle joints, and plantar pressure during training. Methods: Four professional and four amateur athletes performed five snatch lifts. To evaluate the angular measurement, the tests were simultaneously videotaped and the results were contrasted. Results: The angular data presented a correlation coefficient of 0.92 and a delay of 495 ± 200 ms. The characterization of the sensors was implemented in a microcontroller with a mean absolute percentage error of 18.8% in the measurements. When comparing the average results between the elite and amateur groups, the amateur group performed a delayed descent in the first three phases of the lift and an accelerated descent in the fourth phase. A not uniform plantar pressure was registered in the same group, causing a reduction in the final speed of recovery with the barbell. Conclusions: The proposed system has been developed for biaxial angular registration of hip, knee, ankle, and plantar pressure during weightlifting snatch. The option to contrast between signals presented by the system met the requirements requested by the coaching staff and is seen as a promising quantitative analysis tool to support the coach and the athlete.
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