The downstream wake response of marine current energy converters operating in shallow tidal flows

This paper presents findings from an experimental study investigating the downstream wake response from marine current energy convertors operating in various degrees of vertical flow constraint. The paper investigates deep vertically unconstrained sites, mid-depth sites and there is a particular emphasis on shallow tidal stream sites. Shallow tidal resources could be utilised for the deployment of first generation farms. The nature of the downstream wake flow will be a critical factor when determining the farm layout and the wake length is heavily influenced by the flow depth or ratio of rotor diameter to flow depth. A porous actuator disk is used to model the marine current energy convertor and an Acoustic Doppler Velocimeter is used to map the downstream wake. Linear scaling of length ratios suggests mid depth sites of 30-50m will produce the shortest wake lengths and for deeper and shallower sites the wake length increases. It is hoped that these relationships between vertical flow constraint and wake length will help with the layout design of tidal stream farm

Exploring geo-genealogy using internet surname search histories

We present an interactive flow map to visualize aspects of the ways in which surnames have dispersed and migrated around the globe. This work utilizes Internet search queries from the Worldnames Project and uses the density of search locations to determine the node and leaf structures of a flow map. The mapping technique utilized in this work is a variant of geometric minimal Steiner arborescences called the spiral tree. Our implementation is developed in JavaScript to allow for interactive online exploration. Nodes and flow lines can be interactively modified to allow for esthetic changes of color and layout. The results can provide interesting insight into the geography of amateur genealogy

Perbaikan Tata Letak Fasilitas Produksi Pada UD. Tahu Goreng Sky Di Tebing Tinggi Dengan Metode Activity Relationship Chart

Facility layout is a technique to arrange or placing the production facilities with the aim to facilitate the processing and increasing the production. This research focus on improving the Layout of Facilities that have not been well organized in the home industry UD. Tahu Goreng SKY Tebing Tinggi which produces fried tofu. In this research activity changes were made to the Size of the Work Area, the large Work Area, and Distance between Stations using the ARC (Activity Relationship Chat) method, subsequently depicted on the activity relationship map and designed in the Activity Relationship Diagram (ARD) worksheet to provide alternative changes / improvements layout of the home industry that been mentioned above. From the results of this study obtained changes in the area of work area namely 7.5 m2 immersion station, 6.25 m2 milling station, boiling station 7.84 m2, 4.68 m2 screening and opening station, 7.04 m2 pressing station, cutting station 4.29 m2, and 7.84 m2 frying station. The process flow pattern in the new layout changes to a U-shaped process flow from the previously indeterminate angle so as to simplify and facilitate the regular transfer of materials according to the production process flow more convenient and efficien

Does the process map influence the outcome of quality improvement work? A comparison of a sequential flow diagram and a hierarchical task analysis diagram

Background: Many quality and safety improvement methods in healthcare rely on a complete and accurate map of the process. Process mapping in healthcare is often achieved using a sequential flow diagram, but there is little guidance available in the literature about the most effective type of process map to use. Moreover there is evidence that the organisation of information in an external representation affects reasoning and decision making. This exploratory study examined whether the type of process map - sequential or hierarchical - affects healthcare practitioners' judgments.Methods: A sequential and a hierarchical process map of a community-based anti coagulation clinic were produced based on data obtained from interviews, talk-throughs, attendance at a training session and examination of protocols and policies. Clinic practitioners were asked to specify the parts of the process that they judged to contain quality and safety concerns. The process maps were then shown to them in counter-balanced order and they were asked to circle on the diagrams the parts of the process where they had the greatest quality and safety concerns. A structured interview was then conducted, in which they were asked about various aspects of the diagrams.Results: Quality and safety concerns cited by practitioners differed depending on whether they were or were not looking at a process map, and whether they were looking at a sequential diagram or a hierarchical diagram. More concerns were identified using the hierarchical diagram compared with the sequential diagram and more concerns were identified in relation to clinical work than administrative work. Participants' preference for the sequential or hierarchical diagram depended on the context in which they would be using it. The difficulties of determining the boundaries for the analysis and the granularity required were highlighted.Conclusions: The results indicated that the layout of a process map does influence perceptions of quality and safety problems in a process. In quality improvement work it is important to carefully consider the type of process map to be used and to consider using more than one map to ensure that different aspects of the process are captured

PROPOSAL TO IMPROVE THE LAYOUT OF ASSEMBLY DEPARTMENT FOR PANZER MANUFACTURING TO MINIMIZE TRANSPORTATION WASTE WITH LEAN MANUFACTURING IN PT AQL

Waste is activity that uses resources such as time and cost but does not add value to the activity. One of the types of waste is transportation waste. Through observation, transportation waste is found in assembly department of Panzer A. In order to prevent similar occurrences in the future, the waste needs to be minimized by lean manufacturing approach. The study began by collecting and processing the data which are data of existing layout of assembly department, material handling equipment, transportation time, dimension of facilities in existing layout, cycle time of assembly process, and assembly process flow. The data will be used to map existing condition by using current state mapping which consists of a value stream mapping and process activity mapping. Then to identify the causes of transportation waste, the tools used are fishbone diagram. After the cause of waste is identified, an improvement is designed with layout and facility planning to minimize the waste. Keywords: Lean manufacturing, Transportation waste, Value Stream Mapping, Process Activity Mapping, layout and facility planning

Visualisation of Origins, Destinations and Flows with OD Maps

We present a new technique for the visual exploration of origins (O) and destinations (D) arranged in geographic space. Previous attempts to map the flows between origins and destinations have suffered from problems of occlusion usually requiring some form of generalisation, such as aggregation or flow density estimation before they can be visualized. This can lead to loss of detail or the introduction of arbitrary artefacts in the visual representation. Here, we propose mapping OD vectors as cells rather than lines, comparable with the process of constructing OD matrices, but unlike the OD matrix, we preserve the spatial layout of all origin and destination locations by constructing a gridded two‐level spatial treemap. The result is a set of spatially ordered small multiples upon which any arbitrary geographic data may be projected. Using a hash grid spatial data structure, we explore the characteristics of the technique through a software prototype that allows interactive query and visualisation of 105‐106 simulated and recorded OD vectors. The technique is illustrated using US county to county migration and commuting statistics