Defining operational criteria for offshore vessels

2014 ◽  
pp. 201-208 ◽  
Keyword(s):  
Operational Criteria

Accuracy of register-based schizophrenia diagnoses in a genetic study

1998 ◽  
Vol 13 (2) ◽  
pp. 57-62 ◽  
Author(s):  
T Mäkikyrö ◽  
M Isohanni ◽  
J Moring ◽  
H Hakko ◽  
I Hovatta ◽  
...  
Keyword(s):  
Mental Hospital ◽  
Diagnostic System ◽  
Genetic Studies ◽  
Hospital Records ◽  
Statistical Manual ◽  
Diagnostic And Statistical Manual ◽  
Schizophrenia Spectrum ◽  
Broad Concept ◽  
Accuracy Study ◽  
Operational Criteria

SummaryIn order to assess the accuracy of schizophrenia diagnoses for genetic studies, we identified all schizophrenia patients (n = 492) in an isolated community with a diagnosis of schizophrenia in the Finnish Hospital Discharge Register (HDR) between 1969-1991. For the accuracy study we identified a sample of 73 patients from registers with Diagnostic and Statistical Manual (DSM)-III-R for schizophrenia (codes 295.10, 295.30, 295.60, 295.90) (n = 62) or “schizophrenia spectrum” diagnoses (295.40, 295.70, 297.10, 301.20, 301.22) (n = 11). When the operational criteria (DSM-III-R) were applied by two senior researchers using information from the original mental hospital records, 93% (68/73) of the cases fulfilled criteria for schizophrenia or schizophrenia spectrum. The results demonstrate that the schizophrenia diagnoses of the registers are accurate when a broad concept of schizophrenia is applied. When using operational DSM-III-R schizophrenia criteria, eight false positive cases were found among the 62 mental hospital schizophrenia diagnoses. Consequently, there may be a need to reassess schizophrenia diagnoses depending on the purpose of the study. We also found good agreement between DSM-III-R (kappa 0.93) and operational criteria (OPCRIT) diagnostic system (kappa 0.89) diagnoses, made by one researcher, compared with operational diagnoses. This indicates the possibility for the reliable use of one of these methods alone for diagnostic reassessment. The information in the HDR on primary diagnoses and on the dates of admission and discharge was accurately transferred from the hospital records.

Compatibility Study of Condensate and Heavy Oil for Storage in an Iranian Reservoir

2021 ◽  
pp. 1-13
Author(s):  
K. Zobeidi ◽  
M. Ganjeh-Ghazvini ◽  
V. Hematfar
Keyword(s):  
Heavy Oil ◽  
Oil And Gas ◽  
Production Performance ◽  
Compatibility Study ◽  
Asphaltene Precipitation ◽  
High Concentration ◽  
Full Capacity ◽  
Potential Risks ◽  
Operational Criteria ◽  
Positive Effect

Summary During the years 2017–2020, when Iran faced restrictions on the sale of oil and gas condensate and due to the need for domestic consumption and gas sales commitments, it was inevitable to produce gas at full capacity. This coercion has led to significant production of gas condensates. Some of these condensates were sold, some were converted into products such as gasoline in domestic refineries, and some of these condensates needed to be stored, but the storage capacity was limited. For the purpose of underground condensate storage, a heavy oil reservoir was selected based on some technical and operational criteria. A feasibility study was conducted to evaluate the potential risks of condensate injection into the reservoir. The results of tests on asphaltene precipitation, as the most important risk, indicated no severe precipitation would occur even if high concentration of condensate mixed with the reservoir heavy oil. The recovery of condensate and the production performance of the reservoir were simulated in three different injection-production scenarios. The results showed a positive effect of condensate injection on production rate of the reservoir. Moreover, satisfactory volume of condensate could be recovered in a reasonable period of time.

scholarly journals Revising Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, criteria for the bipolar disorders: Phase I of the AREDOC project

2018 ◽  
Vol 52 (12) ◽  
pp. 1173-1182 ◽  
Author(s):  
Gordon Parker ◽  
Gabriela Tavella ◽  
Glenda Macqueen ◽  
Michael Berk ◽  
Heinz Grunze ◽  
...  
Keyword(s):  
Mental Disorders ◽  
Task Force ◽  
Bipolar Disorders ◽  
International Classification Of Diseases ◽  
Statistical Manual ◽  
Diagnostic And Statistical Manual ◽  
Classification Of Diseases ◽  
Operational Criteria ◽  
International Experts

Objective: To derive new criteria sets for defining manic and hypomanic episodes (and thus for defining the bipolar I and II disorders), an international Task Force was assembled and termed AREDOC reflecting its role of Assessment, Revision and Evaluation of DSM and other Operational Criteria. This paper reports on the first phase of its deliberations and interim criteria recommendations. Method: The first stage of the process consisted of reviewing Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, and recent International Classification of Diseases criteria, identifying their limitations and generating modified criteria sets for further in-depth consideration. Task Force members responded to recommendations for modifying criteria and from these the most problematic issues were identified. Results: Principal issues focussed on by Task Force members were how best to differentiate mania and hypomania, how to judge ‘impairment’ (both in and of itself and allowing that functioning may sometimes improve during hypomanic episodes) and concern that rejecting some criteria (e.g. an imposed duration period) might risk false-positive diagnoses of the bipolar disorders. Conclusion: This first-stage report summarises the clinical opinions of international experts in the diagnosis and management of the bipolar disorders, allowing readers to contemplate diagnostic parameters that may influence their clinical decisions. The findings meaningfully inform subsequent Task Force stages (involving a further commentary stage followed by an empirical study) that are expected to generate improved symptom criteria for diagnosing the bipolar I and II disorders with greater precision and to clarify whether they differ dimensionally or categorically.

Instant Center Based Kinematic Formulation for Planar Wheeled Platforms

2010 ◽  
Vol 2 (3) ◽  
Author(s):  
Amit Kulkarni ◽  
Delbert Tesar
Keyword(s):  
Rigid Body ◽  
Input Parameter ◽  
Radial Distance ◽  
Planar Motion ◽  
Mobile Platform ◽  
General Point ◽  
Kinematic Modeling ◽  
Mobile Platforms ◽  
General Order ◽  
Operational Criteria

For a general J wheeled mobile platform capable of up to three-degrees-of-freedom planar motion, there are up to two J independent input parameters yet the output of the platform is completely represented by three independent variables. This leads to an input parameter resolution problem based on operational criteria, which are in development just as they have been developed for n input manipulator systems. To resolve these inputs into a meaningful decision structure means that all motions at the wheel attachment points must have clear physical meaning. To this effect, we propose a methodology for kinematic modeling of multiwheeled mobile platforms using instant centers to efficiently describe the motion of all system points up to the nth order using a generalized algebraic formulation. This is achieved by using a series of instant centers (velocity, acceleration, jerk, and jerk derivative), where each point in the system has a motion property with its magnitude proportional to the radial distance of the point from the associated instant center and at a constant angle relative to that radius. The method of instant center provides a straightforward and physically intuitive way to synthesize a general order planar motion of mobile platforms. It is shown that a general order motion property of any point on a rigid body follows two properties, namely, directionality and proportionality, with respect to the corresponding instant center. The formulation presents a concise expression for a general order motion property of a general point on the rigid body with the magnitude and direction separated and identified. The results are summarized for up to the fifth order motion in the summary table. Based on the initial formulation, we propose the development of operational criteria using higher order properties to efficiently synthesize the motion of a J wheeled mobile platform.

The development of a Single-Well Oil Production System

1982 ◽  
Vol 307 (1499) ◽  
pp. 279-287
Keyword(s):  
Conceptual Design ◽  
Production System ◽  
Oil Production ◽  
Design Phase ◽  
New Approach ◽  
Detail Design ◽  
Single Well ◽  
Operational Criteria

Since early 1980, BP has been developing the conceptual design of a Single-Well Oil Production System or SWOPS. This paper outlines the concept and discusses the design and the operational criteria that have been applied in this early work. It further examines some of the innovative areas of technology that have been included in this new approach and outlines the work of the detail design phase, which has just started.

scholarly journals Site Selection for Joint Logistics over the Shore (JLOTS) Operations Using Multi- Objective Decision Analysis

2016 ◽  
Vol 4 (2) ◽  
pp. 88-95
Author(s):  
Mike Evans ◽  
Mike Lami ◽  
Brendan Madarasz ◽  
Benjamin Smith ◽  
Chris Green
Keyword(s):  
Decision Analysis ◽  
Site Selection ◽  
Decision Support Tool ◽  
Military Operations ◽  
Support Tool ◽  
Multi Objective ◽  
Selection Protocol ◽  
Operational Criteria ◽  
A Site ◽  
Development Center

As the U.S. military faces an increasing need to deploy across a range of military operations and environments, the ability to establish and sustain logistics support remains a major challenge. The Engineer Research and Development Center is currently developing the Planning Logistics Analysis Network System (PLANS), a decision support tool, to facilitate strategic and operational logistics planning. This paper describes a site selection protocol for logistics operations occurring without a suitable port, commonly referred to as Logistics over-the Shore (LOTS) operations. The model uses multi- objective decision analysis techniques to weight different operational criteria to determine the best overall site for logistics over the shore operations. This tool will enhance the time and accuracy in determining an optimal site that meets the decision maker’s specific operational needs.

scholarly journals Operational criteria for a successful cross-dock-based supply chain

2011 ◽  
Vol 8 (4) ◽  
pp. 193-200
Author(s):  
John Vogt ◽  
Wessel Pienaar
Keyword(s):  
Supply Chain ◽  
Supply Chains ◽  
Common Definition ◽  
Cross Docking ◽  
Different Types ◽  
Operational Criteria

There is a need for a common definition for cross-dock-based supply chains; and there is a need to understand the different types of cross-dock based supply chains. This paper offers encompassing definitions of ‘cross-dock-based supply chain’ and ‘cross-dock facility’. The definitions are applicable to all types of cross-dock-based supply chains and cross-dock facilities. Comprehensive research on cross-docking in the context of the entire supply chain is lacking. The paper shows that cross-dock-based supply chains are of three different types, defined by three principal features. Empiric research was conducted in order to ascertain the operational criteria needed to maximize value from all three types of cross-docking operations.

A new project scheduling approach for improving multi-product multi-period production planning problems

2008 ◽  
Vol 222 (11) ◽  
pp. 1517-1527 ◽  
Author(s):  
S Noori ◽  
M Bagherpour ◽  
F Zorriassatine ◽  
A Makui ◽  
R Parkin
Keyword(s):  
Production Planning ◽  
Project Scheduling ◽  
Resource Constraints ◽  
Simulation Analysis ◽  
Analytical Models ◽  
Hybrid Solutions ◽  
Demand Fluctuations ◽  
Feasible Solutions ◽  
Operational Criteria ◽  
Planning Problems

The problem of matching production levels for individual products to demand fluctuations during multiple periods is known in the production planning literature as the multi-product multi-period (MPMP) problem. Linear programming (LP)-based solutions have been extensively reported in this respect. MPMP problems are commonly solved by using either analytic or simulation methods. More recently, hybrid solutions consisting of both analytical models and simulation analysis have been proposed where some operational criteria, e.g. the order of visit to machining centres, are taken into account. In this paper, results related to some of the literature based on hybrid solutions are used as the initial feasible solutions and then examined in the context of project scheduling by considering the influences of resource constraints. After converting the MPMP to a project network problem and assigning resources to activities and consequently levelling the resource profiles, it is discovered that machine utilization can be further improved by applying unused machine capacities. A LP model is therefore developed in order to maximize feasible production rates over all the production planning periods. The proposed approach results in improvements on the results of earlier hybrid solutions reported in the literature. Finally, three different planning problems are suggested for further applications of the proposed approach in the context of manufacturing environments.

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