Handover Location Research Articles

A heuristic algorithm for equipment scheduling at an automated container terminal with multi-size containers

With the increasing volume of shipping containers, container multimodal transport and port scheduling have attracted much attention. The allocation and dispatching of handling equipment to minimize completion time and energy consumption have always been a focus of research. This paper considers a scheduling problem at an auto-mated landmaritime multimodal container terminal with multi-size containers, in which operating facilities and equipment such as quay cranes, vehicles, yard cranes, and external container trucks are involved. Moreover, the diversity of container sizes and the location of handshake areas in yards are concerned. A mixed integer program-ming model is established to schedule all operating facilities and equipment. To solve the mathematical model is a NP-hard problem, which is difficult to be solved by conventional methods. Then we propose a heuristic algorithm which merges multiple targets into one and designs an improved genetic algorithm based on the heuristic combi-nation strategy in which 20-ft containers are paired-up to the same yard before allocation. After that, some exper-iments are designed to prove the effectiveness of the model and the algorithm. The effect of configurations on efficiency and energy consumption under different conditions is discussed, and the influences of different parame-ters and the proportion of 20-ft containers are also compared. Furthermore, the influence of locations of hand-shake area with different yard quantities are compared. To conclude, there is an optimal number of equipment to be allocated. If few equipment is used, the operation time will be prolonged; if too many, the energy consumption will be increased. When the yard operation is the bottleneck, the handover location should be in the centre, other-wise other locations might be feasible. When the proportion of 20-ft containers that can be combined is large, the method proposed in this paper has advantages over traditional methods. The proposed algorithm has made a breakthrough in improving efficiency and reducing energy consumption.

Improving patient handover: A narrative review.

The clinical handover process has been directly associated with patient safety. Improving patient handover can improve patients' safety and ultimate outcomes; therefore, this review was conducted to examine the literature available on interventions that make handovers more effective. MEDLINE (EBSCO) was searched for interventions that improve the efficacy of clinical handovers. Studies were excluded if they were irrelevant, not published in peer-reviewed journals, not published in English, or were based on animal studies. A total of 1087 publications were retrieved and sorted by relevance. The eligibility of the articles was determined by reading through the titles and abstracts then full texts, and reference searching. Six studies were selected for this literature review. A number of handover interventions were explored. One intervention was changing the handover location to patients' bedside; Bradley et al. found that bedside handovers decreased handover time and patient adverse events. Another intervention was providing education on handovers which Sand-Jecklin et al. associated with reductions in adverse events. Moreover, Lee et al. used simulation-based education and found that it significantly improved nurses' knowledge, performance competence, and self-efficacy. Another intervention was the transforming care at the bedside (TCAB) framework which incorporated multidimensional strategies and emphasized handover as part of patient centeredness; these strategies improved patient safety, yet the results cannot be attributed solely to handover modifications. Meanwhile, Hada et al. implemented a mixture of interventions and found that they improved patient safety and reduced adverse events. The interventions explored were bedside handovers, providing education and simulation-based education on handovers, emphasizing patient centeredness as part of TCAB strategies, and implementing a mixture of interventions. All interventions reduced adverse events, although some improvements were not significant. Due to the limited evidence available to support the efficacy of the interventions on improving clinical handovers, the results remain inconclusive.

Design of Electromagnetic Control of the Needle Gripping Mechanism

This paper deals with the modification of the mechanical system of the needle bar. The purpose of this work is to reduce the vibration and noise of the sewing machine for creating a decorative stitch. A special floating needle is used to sew this stitch, in which two mechanical systems of needle bars handover through the sewn material, so that a perfect imitation of a hand stitch is created. The original system, which controls the release of the needle at the handover location by abruptly stopping the needle bar control element, could be replaced by a new system that uses magnetic force to release the needle. In addition to the usual design procedure, numerical simulations of the attractive force of the electromagnet are also used in the design of a suitable electromagnet. At the same time, an electrical circuit is also designed to allow the needle to be released and gripped quickly. The advantages of the new system lie not only in reducing vibrations and the associated increase in the operation speed of the machine, but also in making it easier for the machine to switch to possible automated or semi-automated production.

Order batching and batch sequencing in an AMR-assisted picker-to-parts system

Efficient order fulfillment processes in warehouses are a key success factor in times of increasing global retail sales volumes and same-day deliveries. To streamline order fulfillment processes, warehouse managers frequently rely on autonomous mobile robots (AMRs). By supporting human order pickers with AMRs, unproductive picker walking time can be reduced, which is essential for increasing the performance of a traditional picker-to-parts system. We study an AMR-assisted picker-to-parts system in which the warehouse is partitioned into disjoint zones, each with one order picker assigned to it. A set of customer orders is given, each associated with a due date until which its items are to be collected. Each AMR of a given fleet is responsible for transporting the items of a single batch of customer orders from the picking area to the depot. An order picker collects those batch items that are stored in her zone and transports them to a handover location. The AMR visits the handover locations and returns to the depot after collecting all batch items. The objective is to minimize the total tardiness of all customer orders. We define the resulting problem as mixed integer program and provide an efficient heuristic solution approach. Furthermore, we investigate the influence of increasing the AMR fleet size and varying travel and walking speed ratios between AMRs and order pickers. We find that a slight increase in the speed ratio leads to a larger reduction of the total tardiness compared to increasing the AMR fleet size.

An efficient trajectory planning for cellular-connected UAV under the connectivity constraint

Unmanned Aerial Vehicles (UAVs) acting as aerial users to access the cellular network form a promising solution to guarantee its safe and efficient operations via the high-quality communication. Due to the flexible mobility of UAVs and the coverage range limits of ground base station (GBS), the signal-to-noise ratio (SNR) of the communication link between UAVs and GBS will fluctuate. It is an important requirement to maintain the UAV's cellular connection to meet a certain SNR requirement during the mission for UAV flying from take off to landing. In this paper, we study an efficient trajectory planning method that can minimize a cellular-connected UAV's mission completion time under the connectivity requirement. The conventional method to tackle this problem adopts graph theory or a dynamic programming method to optimize the trajectory, which generally incurs high computational complexities. Moreover, there is a non-negligible performance gap compared to the optimal solution. To this end, we propose an iterative trajectory optimizing algorithm based on geometric planning. Firstly, we apply graph theory to obtain all the possible UAV-GBS association sequences and select the candidate association sequences based on the topological relationship among UAV and GBSs. Next, adopting the triangle inequality property, an iterative handover location design is proposed to determine the shortest flight trajectory with fast convergence and low computation complexity. Then, the best flight trajectory can be obtained by comparing all the candidate trajectories. Lastly, we revealed the tradeoff between mission completion time and flight energy consumption. Numerical results validate that our proposed solution can obtain the effectiveness with set accuracy and outperform against the benchmark schemes with affordable computation time.

Design and Simulation of Optimal Number of Small Cells Deployment in Fourth-Generation Cellular Networks

In next-generation of wireless communication systems, Fifth-Generation (5G), small cells deployment is one of the most important issues that must be taking in the account. This paper discusses this issue in three aspects. First, it aims to derive the Critical Handover Location (CHL) point for neighbouring wireless stations which in turn is considered an entrance to the second aspect of this work that decides the small cell placement in one network. Finally, the work proposed a new approach to evaluating the Number of Small Cells (NRS) deployment mathematically. The proposed approach provides the balance in resources allocation in the network in terms of transmitted power of each small cell and their placement in order to provide maximum capacity and coverage area with a lower level of interference between nearest wireless stations thus decreasing the total cost of network insulation.

Prehospital management of patients with suspected acute coronary syndrome : Real world experience reflecting current guidelines.

BackgroundIn case of suspected acute coronary syndrome (ACS), international guidelines recommend to obtain a 12-lead ECG as soon as possible after first medical contact, to administrate platelet aggregation inhibitors and antithrombins, and to transfer the patient as quickly as possible to an emergency department.MethodsA German emergency care service database was retrospectively analysed from 2014 to 2016. Data were tested for normal distribution and the Mann–Whitney test was used for statistical analysis. Results are presented as medians (IQR).ResultsA total of 1424 patients with suspected ACS were included in the present analysis. A 12-lead ECG was documented in 96% of patients (n = 1369). The prehospital incidence of ST-segment elevation myocardial infarction (STEMI) was 18% (n = 250). In 981 patients (69%), acetylsalicylic acid (ASA), unfractionated heparin (UFH), or ASA and UFH was given. Time in prehospital care differed significantly between non-STEMI (NSTEMI) ACS (37 [IQR 30, 44] min) and STEMI patients (33 [IQR 26, 40] min, n = 1395, p < 0.0001). Most of NSTEMI ACS and STEMI patients were brought to the emergency care unit, while 30% of STEMI patients were directly handed over to a cardiac catheterization laboratory.ConclusionsPrehospital ECG helps to identify patients with STEMI, which occurs in 18% of suspected ACS. Patients without ST-elevations suffered from longer prehospital care times. Thus, it is tempting to speculate that ST-elevations in patients prompt prehospital medical teams to act more efficiently while the absence of ST-elevations even in patients with suspected ACS might cause unintended delays. Moreover, this analysis suggests the need for further efforts to make the cardiac catheterization laboratory the standard hand-over location for all STEMI patients.

The Utilization of Lean Management in Nursing Handover at a Psychiatric Acute Ward

Efficient handover is essential to ensuring high levels of caring quality and patient safety. In our psychiatric acute ward, it was noticed that there were many valueless tasks being performed during the nursing handover process that negatively affected efficiency. To apply lean management principles to improve the nursing handover process in the psychiatric acute ward. In order to find the rightful solution, our task team analyzed the problem using the Value Chart of Lean Management and detected that the handover process was slowed down by motion, waiting, and defects. According to the rules of lean management, group discussion, decision making, and the cost-benefit matrix, we proposed improvement solutions including visual stocktaking, adjusting handover patterns, switching the handover location, and systematizing nursing handover procedures. The time required for stocktaking was shortened from 5 to 2 minutes (60% improvement). The waiting time was shortened from 114 to 49.6 minutes (56.6% improvement). The efficiency of the handover process increased from 66% to 90%. Applying lean management principles helped detect critical problems and reduce waste, which enhanced efficiency, improved handover, and helped maximize nursing value and benefit in an increasingly complex environment.

The where of handovers by humans: Effect of partner characteristics, distance and visual feedback.

Object handovers between humans are common in our daily life but the mechanisms underlying handovers are still largely unclear. A good understanding of these mechanisms is important not only for a better understanding of human social behaviors, but also for the prospect of an automatized society in which machines will need to perform similar objects exchanges with humans. In this paper, we analyzed how humans determine the location of object transfer during handovers- to determine whether they can predict the preferred handover location of a partner, the variation of this prediction in 3D space, and to examine how much of a role vision plays in the whole process. For this we developed a paradigm that allows us to compare handovers by humans with and without on-line visual feedback. Our results show that humans have the surprising ability to modulate their handover location according to partners they have just met such that the resulting handover errors are in the order of few centimeters, even in the absence of vision. The handover errors are least along the axis joining the two partners, suggesting a limited role for visual feedback in this direction. Finally, we show that the handover locations are explained very well by a linear model considering the heights, genders and social dominances of the two partners, and the distance between them. We developed separate models for the behavior of ‘givers’ and ‘receivers’ and discuss how the behavior of the same individual changes depending on his role in the handover.

Handover Algorithm based VLP using Mobility Prediction Database for Vehicular Network

&lt;span&gt;This paper proposes an improved handover algorithm method for vehicle location prediction (VLP-HA) using mobility prediction database. The main advantage of this method is the mobility prediction database is based on real traffic data traces. Furthermore, the proposed method has the ability to reduce handover decision time and solve resource allocation problem. The algorithm is simple and can be computed very rapidly; thus, its implementation for a high-speed vehicle is possible. To evaluate the effectiveness of the proposed method, QualNet simulation is carried out under different velocity scenarios. Its performance is compared with conventional handover method. The superiority of the proposed method over conventional handover method in deciding the best handover location and choosing candidate access points is highlighted by simulation. It was found that VLP-HA has clearly reduced handover delay by 45% compared to handover without VLP, give high accuracy, hence low complexity algorithm.&lt;/span&gt;

The effect of handover location on trauma theatre start time- An estimated cost saving of £131,000 per year

The effect of handover location on trauma theatre start time- An estimated cost saving of £131,000 per year

The effect of handover location on trauma theatre start time: An estimated cost saving of £131000 per year.

The National Health Service was estimated to be in £2.45 billion deficit in 2015 to 2016. Trauma theatre utilization and efficiency has never been so important as it is estimated to cost £15/minute. Structured questionnaires were given to 23 members of staff at our Trust who are actively involved in the organization or delivery of orthopaedic trauma lists at least once per week. This was used to identify key factors that may improve theatre efficiency. Following focus group evaluation, the location of the preoperative theatre meeting was changed, with all staff involved being required to attend this. Our primary outcome measure was mean theatre start time (time of arrival in the anaesthetic room) during the 1month immediately preceding the change and the month following the change. Theatre start time was improved on average 24minutes (1month premeeting and postmeeting change). This equates to a saving of £360 per day, or £131040 per year. Changing the trauma meeting location to a venue adjacent to the trauma theatre can improve theatre start times, theatre efficiency, and therefore result in significant cost savings.

Analysis of Handover Trigger Scheme Based on Distance for LTE High-speed Railway Networks

In high-speed railway environment, frequent handovers and high handover failure probability result in serious communication interruptions and call drops, which become pressing problem to be solved. Alternative reference point based handover scheme can be an applicative solution for high-speed rail. This paper analyzes the impact of handover location on the handover performance. And numerical analysis is utilized to give a method to determine the distance from the serving eNodeB and the adjacent one to the mobile terminal when handover is triggered. Handover failure probability is used as criteria for performance. Simulation results show that the proposed scheme has a better performance than typical event based scheme in high speed environment.

Impacts of Robot Head Gaze on Robot-to-Human Handovers

In this paper, we investigate the use of a robot's gazetoimprovethetimingandsubjectiveexperienceofface- to-face robot-to-human handovers. Based on observations of human gaze behaviors during face-to-face human-human handovers, we implement various gaze behaviors on a PR2 humanoid robot. We conducted two consecutive robot-to- human handover studies. Results show that when the robot continually gazes at a projected handover position while handing over an object, the human receivers reach for the object significantly earlier than when the robot looks down, away from the handover location; further, when the robot continually gazes at the receiver's face instead of the handover position, the receivers reach for the object even earlier. When the robot—instead of continually gazing at a location—transitions its gaze from the handover position to the receivers' face, or vice versa, the receivers' reach time did not improve; however, the receivers perceive these gaze transitions to better communicate handover timing than con- tinual gazes. Finally, the receivers perceive the robot to be more likeable and anthropomorphic when it looks at their

Enabling vehicular mobility in city-wide IEEE 802.11 networks through predictive handovers

The increasing number of IEEE 802.11 networks deployed worldwide gives mobile users the possibility of experiencing high-speed wireless access on the move. Moreover, the high density of these deployments in urban areas make IEEE 802.11 a suitable access technology for moving vehicles. However, in order to provide a seamless access to vehicles, the transition between Access Points (APs) must be quick and reliable. The main bottleneck of existing handover mechanisms is the long AP scanning process, which only provides a snapshot of the available networks at a given location, impacting the handover decision on moving vehicles. To overcome this limitation, we propose coper, a context-based predictive handover mechanism that considers vehicle's trajectory, road topology, and network deployment information to decide the best handover location and candidate access points. We validate with real experiments in a city-wide 802.11 network and show that coper can provide better average signal strength, data rate, and connected time than other existing handover approaches.

Morning handover of on-call issues: opportunities for improvement.

Handover is the process of transferring pertinent patient information and clinical responsibility between health care practitioners. Few studies have examined morning handover from the overnight trainee to the daytime team. To characterize current morning handover practices in 2 academic medical centers by assessing the frequency of omissions of clinically important overnight issues during morning handover and identifying factors that influence the occurrence of such omissions. A prospective, point-prevalence study was conducted in the general internal medicine wards of 2 tertiary care academic medical centers in Toronto, Ontario, Canada, in 2012 and 2013. Participants included on-call third-year medical students and first- and second-year residents. Completeness of morning handover of clinically important overnight issues identified using a targeted medical records review and processes of morning handover characterized by direct observation. We identified 141 clinically important overnight issues during 26 days of observation. The on-call trainee omitted 40.4% (95% CI, 32.3%-48.5%) of clinically important issues during morning handover and did not document any information in the patient's medical record for 85.8% (95% CI 80.1%-91.6%) of these issues. By univariate analysis, running the list patient-by-patient (ie, the entire team discusses each patient) (OR, 4.32; 95% CI, 1.94-9.60; P < .001) and using a dedicated handover location (OR, 2.61; 95% CI, 1.30-5.22; P = .007) positively correlated with handover of an issue taking place, whereas distractions in the meeting area inversely correlated with the likelihood of handover of an issue taking place (OR, 0.96 for every increase in 1 distraction; 95% CI, 0.93-0.98; P = .002). Using a multivariate mixed-effects model, only running the list remained as an independent predictor of the handover of an issue (OR, 3.80; 95% CI, 1.25-11.49; P = .02). On-call trainees omit numerous clinically important issues when handing over to the daytime team. Training programs should introduce educational activities and workflow changes, and provide dedicated time and a distraction-free environment, to improve handover of on-call issues.

Reliability Modeling in Wireless Cellular Networks with User Profile based Location Management

Now-a-days wireless network is providing ubiquitous communication services to a vast number of mobile users. The most salient feature of wireless network is mobility support, which enables mobile users to communicate with others regardless of location. The important design criteria in wireless networks are to support guaranteed quality of services (QoS) to mobile users. The handover management and location management is one such QoS parameter for the wireless network. In this paper, we propose user profile based (UPB) scheme to provide reliable location tracking of user in case of VLR overloading or congestion in network or any other problem when we need to check the VLR. UPB is based on historical movement information of user. We have also taken a Random Searching Technique (RST) and Sequential Search Technique (SST) to compare UPB. In RST scheme, searching of cell is design in a random order and SST is design in ascending order. Our analyses reduce no. of search and average waiting time of mobile subscriber when searching of user is based on UPB.

A Compute Method of Road Travel Speed based on Mobile Phone Handover Location

It is a focus to obtain traffic information from mobile phone location data in recent years. Based on mobile phone handover location technology, and considering the characteristics of the handover location data and drawbacks of the existing map matching algorithms, a new algorithm of road matching based on Fuzzy Logic is proposed. The general principle of this method is to firstly find out the candidate roads considering the constraint of handover cells, and then use fuzzy logical and other constraints to narrow the range of candidate road, and finally obtained the optimal road by the judgment of membership function. At the last of this paper, real mobile phone handover location data, road network data and the base station data of Kunming, the capital city of Yunnan province of China, are used to test the performance of the algorithm, and the travel speed of an experiment road is calculated and the result is satisfactory.

Offline handover location positioning for map matching of mobile probes

Handover location technology was employed for collecting road traffic information in a number of field projects, and the project results demonstrate that it is a supplementary and promising means of road traffic information collection for further traffic supervision and maintenance. Because handover location technology is one kind of pattern matching based location technologies, offline handover location positioning is an essential problem to be studied for successfully matching mobile probes on GIS map. Offline handover location positioning method involves two stages, handover location positioning respectively via two weighted models and an optimized model based on the intermediate results obtained in the first stage. A preliminary field test is conducted on a stretch of freeway in the inner suburban region in Beijing, and performance evaluation results show that the proposed method is superior to standard least square model in location accuracy and location precision, which is an effective method of offline handover location positioning.

Seamless Dual-Link Handover Scheme in Broadband Wireless Communication Systems for High-Speed Rail

Due to frequent handovers in broadband wireless communications in high-speed rail, communication interruption during handover could seriously degrade the experiences of passengers on the train. Aiming to reduce the interruption time, this paper proposes a seamless handover scheme based on a dual-layer and dual-link system architecture, where a Train Relay Station is employed to execute handover for all users in a train and two antennas are mounted at the front and rear of a train. In the proposed scheme, the front antenna executes handover while the rear antenna is still communicating with BS, so that the communication can keep non-interruptive throughout the handover. Moreover, bi-casting is adopted to eliminate the data forwarding delay between the serving BS and target BS. A complete handover protocol is designed and the performance of the proposed scheme is analyzed. It can be seen from analytical results that the handover failure probability decreases as cell overlap increases and the communication interruption probability decreases with the decrease of train handover location and the increase of cell overlap. The simulation results show that in the proposed scheme, the communication interruption probability is smaller than 1% when the handover location is properly selected and the system throughput is not affected by handover. In conclusion, both theoretical and simulation results show that the proposed scheme can efficiently perform seamless handover for high-speed rail with low implementation overhead.