Business model optimization plan for S.F. Group's fresh e-commerce business

Nowadays, the market is increasingly fierce, so many companies seek new growth points through business diversification. However, logistics companies have not succeeded in integrating business in the e-commerce industry. In order to answer the failure of logistics enterprises in the field of E-commerce, this paper chooses S.F. BEST as the research object. Case study is conducted on JD.com FRESH and MISSHFRESH to explore their successful experience in business model and the diversity of the industry. After that, we proposed feasible suggestions on the problems existing in S.F. Group. The study of this project found that fresh e-commerce not only needs to provide customers with quality products and delivery services but also needs to establish a good relationship with customers through platforms and channels. However, S.F. Group lacked the ability of platform and channel management, and its market positioning was obviously wrong, so it suffered from business failure and financial losses. Aiming at the shortcomings of S.F. Group's business model in market positioning accuracy and resource utilisation ability, this project proposes improvement suggestions and a development plan. By improving the implementation of the plan, we hope to help S.F. Group reshapes its business model and business operation process, and help the company achieve business diversification and vertical integration.Na actualidade, o mercado está cada vez mais feroz, levando a que muitas empresas procurem novas vias de crescimento através da diversificação dos negócios. No entanto, as companhias de logística não conseguiram desenvolver os seus negócios no sector de comércio electrónico. A fim de dar conta do fracasso das referidas companhias no domínio do comércio electrónico, o presente trabalho tem o S.F. BEST como objecto de investigação. O estudo de caso é conduzido para explorar a experiência bem-sucedida do modelo de negócios e a diversidade do setor. Em seguida, propusemos sugestões viáveis sobre os problemas existentes no S.F. Grupo. O estudo do presente trabalho constatou que o comércio electrónico actual não apenas necessita de oferecer aos clientes produtos de qualidade elevada e prestar serviços de entrega eficaz, mas também precisa de estabelecer um bom relacionamento com os clientes através de várias plataformas e canais. No entanto, o S.F. Grupo não possuía a capacidade de gestão de plataforma e canal, com um posicionamento obviamente errado no mercado, por consequência, sofreu de fracasso nos negócios e perdas financeiras. O presente trabalho propõe sugestões de melhoria e um plano de desenvolvimento, focando nas deficiências do modelo de negócios do S.F. Grupo de negócios acerca da imprecisão de posicionamento no mercado e incapacidade de utilização de recursos. Através de melhorar a implementação do plano, esperamos ajudar o S.F. Grupo na reestruturação do modelo de negócios e do processo de operação de negócios, ajuda a empresa a alcançar a diversificação de negócios e integração vertical

Learning to Run challenge solutions: Adapting reinforcement learning methods for neuromusculoskeletal environments

In the NIPS 2017 Learning to Run challenge, participants were tasked with building a controller for a musculoskeletal model to make it run as fast as possible through an obstacle course. Top participants were invited to describe their algorithms. In this work, we present eight solutions that used deep reinforcement learning approaches, based on algorithms such as Deep Deterministic Policy Gradient, Proximal Policy Optimization, and Trust Region Policy Optimization. Many solutions use similar relaxations and heuristics, such as reward shaping, frame skipping, discretization of the action space, symmetry, and policy blending. However, each of the eight teams implemented different modifications of the known algorithms.Comment: 27 pages, 17 figure

Molecular Dynamics Study of Laser Interaction with Nanoparticles in Liquids and Its Potential Application

Laser interaction with nanoparticles in liquid is the fundamental theoretical basis for many applications but it is still challenging to observe this nanoscale phenomenon within a few nanoseconds in liquid by experiment. The successful implementation of the two-temperature method integrated with molecular dynamics (TTM-MD) in laser interaction with bulk material has shown great potential in providing a panoramic view of the laser interaction with the nanoparticles. However, the current TTM-MD model has to divide the system into cubic cells, which leads to mistakes near the nanoparticle’s surface. We introduce the latest model, which performs the TTM-MD on each individual cluster instead of the cubic cells, and its high-performance parallel cluster analysis algorithm to update the cluster size. The cluster-based TTM-MD revealed the nanoparticle formation mechanism of laser fragmentation in liquid (LFL) and facilitated the study of laser fluence’s effect on the size distribution. In addition to LFL, this model is promising to be implemented in the laser thermal therapy of tumors, laser melting in liquid (LML), etc. Although cluster-based TTM-MD has proven to be a powerful tool for studying laser interaction with nanoparticles, a few challenges and future developments for the cluster-based TTM-MD, especially the ionization induced by femtosecond, are also discussed

Full-Resolution Light-Field Camera via Fourier Dual Photography

Conventional light-field cameras with a micro-lens array suffer from resolution trade-off and shallow depth of field. Here we develop a full-resolution light-field camera based on dual photography. We extend the principle of dual photography from real space to Fourier space for obtaining two-dimensional (2D) angular information of the light-field. It uses a spatial light modulator at the image plane as a virtual 2D detector to record the 2D spatial distribution of the image, and a real 2D detector at the Fourier plane of the image to record the angles of the light rays. The Fourier-spectrum signals recorded by each pixel of the real 2D detector can be used to reconstruct a perspective image through single-pixel imaging. Based on the perspective images reconstructed by different pixels, we experimentally demonstrated that the camera can digitally refocus on objects at different depths. The camera can achieve light-field imaging with full resolution and provide an extreme depth of field. The method provides a new idea for developing full-resolution light-field cameras

Treatment of Delayed Acetabular Fractures by Periacetabular Osteotomy through the Lateral‐Rectus Approach

Objective There has been a controversy in the surgical approach for delayed acetabular fracture. The objective of the present study is to investigate the feasibility, surgical techniques, safety, and efficacy of periacetabular osteotomy using the single lateral‐rectus approach (LRA) for the surgical treatment of delayed acetabular fracture. Methods The retrospective study included 22 patients (16 males and six females, with an average age of 45 years) with delayed acetabular fractures from June 2012 to June 2019. For all cases, periacetabular osteotomy was performed through the single LRA. Fracture classification, mechanism of injury, associated injury, time to surgery, operation time, intraoperative blood loss, and complications were recorded and analyzed. The quality of the reduction was assessed based on Matta radiographic criteria. Potential impact factors affecting the quality of reduction were analyzed. Functional outcome was evaluated at the final follow‐up according to a modified Mere D'Aubigne‐Postel scoring system for each patient. Results All patients were followed up for at least 12 months. The duration of surgery was 140 min on average (110–205 min) and the mean intraoperative blood loss was 1250 ml (500–2100 ml). According to Matta radiographic criteria, the accuracy of reduction was “anatomical” in seven patients, “imperfect” in 11 patients, and “poor” in four patients, with an excellent and good rate of 81.8%. The time to surgery in poor reduction group was significantly longer than anatomical or imperfect reduction group (p < 0.05). All the acetabular fractures united after 8–12 weeks. The average modified Merle D'Aubigne‐Postel score evaluated at the final follow‐up was 14.6 (6–18), and the clinical outcomes were rated as excellent in six patients, good in 10 patients, fair in four patients, and poor in two patients, with an excellent and good rate of 72.7%. There were two cases of osteonecrosis of the femoral head (9%). No other complication was found for all cases. Conclusion The LRA is an effective and minimally invasive approach in the treatment of delayed acetabular fractures excluding posterior wall fracture and posterior dislocation

Full-Resolution Light-Field Camera via Fourier Dual Photography

Conventional light-field cameras with a micro-lens array suffer from resolution trade-off and shallow depth of field. Here we develop a full-resolution light-field camera based on dual photography. We extend the principle of dual photography from real space to Fourier space for obtaining two-dimensional (2D) angular information of the light-field. It uses a spatial light modulator at the image plane as a virtual 2D detector to record the 2D spatial distribution of the image, and a real 2D detector at the Fourier plane of the image to record the angles of the light rays. The Fourier-spectrum signals recorded by each pixel of the real 2D detector can be used to reconstruct a perspective image through single-pixel imaging. Based on the perspective images reconstructed by different pixels, we experimentally demonstrated that the camera can digitally refocus on objects at different depths. The camera can achieve light-field imaging with full resolution and provide an extreme depth of field. The method provides a new idea for developing full-resolution light-field cameras

NeuroRDM: An Explainable Neural Network Landscape of Reaction-Diffusion Model for Cognitive Task Recognition

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Tribological Behavior of High Entropy Alloy Coatings: A Review

As engineering equipment is applied in a harsh environment with a heavy load, cyclic stress, and a wide range of temperatures, the reliability of the equipment becomes a challenge, especially when wear contact is involved. Hence, the design and exploitation of an advanced alloy surface may hold the key to control and minimize friction and wear in the transmission system for safety-critical applications. High entropy alloys (HEAs) or multi-component alloys have been proved to have outstanding mechanical properties, corrosion resistance, and high-temperature oxidation resistance with potential use as wear resistance and friction reduction coatings. In this paper, the properties and development status of HEAs coating systems for tribological applications were reviewed to gain a better understanding of their advantages and limitations obtained by different preparation methods. Specifically, focus was paid to magnetron sputtering, laser cladding, and thermal spraying since these three deposition methods were more widely used in wear-resistant and friction-reducing coatings. Building upon this, the correlation between composition, mechanical properties, and friction as well as wear characteristics of these coatings are summarized. Finally, the key problems to be solved to move the field forward and the future trend of tribology application for HEA coatings are outlined

Experimental Investigation of Isothermal Section in the La–Co–Ni System at 723 K

The isothermal section of the La–Co–Ni ternary system at 723 K has been constructed in this work by using X-ray diffraction (XRD), scanning electron microscopy, and energy dispersion spectroscopy techniques (SEM-EDS). The experimental results show no existence of ternary compounds at 723 K. The isothermal section consists of 16 two-phase regions and 8 three-phase regions. La3Co and La3Ni, La2Co3 and La2Ni3, La2Co7 and La2Ni7, and LaCo5 and LaNi5 form a continuous solid solution. The ternary solid solubility of Ni in LaCo13 phase and La2Co1.7 phase was determined to be 15.61 at.% and 9.61 at.%, respectively. The solid solubility of Co in the LaNi3, La7Ni3, and LaNi phases was 18.07 at.%, 5.62 at.%, and 8.49 at.%, respectively. The present experimental results are important for the design of La(Fe,Si)13-based magnetic refrigeration materials