Automatic evaluation of the accuracy of fixed-point algorithms

全自动血凝分析仪ACL TOP 700性能验证及评价

刘双;丛琳;乐家新;海涵;周汉王;肖征

【摘 要】Objective To investigate the performance verification and clinical

value of automatic blood coagu-lation analyzer ACL TOP 700 from IL

Corporation of USA. Methods Taking prothrombin time (PTT), activated

par-tial thromboplastin time (APTT), fibrinogen (FIBN), thrombin time (TT)

as analysis parameters, the accuracy, precision, linearity, carrying

contamination rate, interference experiments, accuracy and reference

intervals observed for perfor-mance verification and evaluation of the

instrument. Results The FIB accuracy bias of ACL TOP 700 was less than

10%, which was in line with the industry standard. The intra-assay precision

and inter-batch precision were also in line with industry standards. The

linear correlation coefficient of FIB was R=0.9991, a=0.9788, which was in

I 摘要

船舶状态数据中包含了大量有重要价值的信息，针对船舶状态数据的数据

挖掘工作可以为智慧水运的发展做出有力支持。然而这些数据中存在大量的问

题数据，在挖掘之前对这些问题数据进行清洗和修复是必不可少的步骤。现有的

数据清洗和修复方法如果直接应用到船舶状态数据中，效果并不理想。

为保证数据清洗和修复工作的精确性，每一种问题数据都需要制定特定的

方法来进行清洗或修复。基于此，本文将重点研究目前船舶状态数据中对数据挖

掘工作影响最为严重的两类问题，即重复问题以及轨迹数据的缺失问题。本文的

主要研究工作如下：

（1）针对现有的相似重复数据检测算法-SNM算法（Sorted-Neighborhood

Method, SNM）检测效率低的问题，提出一种改进的滑动窗口策略，然后结合基

于Top-K的过滤策略来提高检测效率。改进的滑动窗口策略即滑动窗口大小动

态可变策略，窗口大小可以根据检测的情况随时改变，既减少不必要的比较，又

减少漏配现象；基于Top-K的过滤策略使不满足条件的数据提前结束比较，大

大缩短检测时间。通过对比实验验证了本文的改进算法在检测效率上要优于其

他算法。

（2）针对由于字段权重设置主观性过强导致SNM算法检测精确度低的问

题，提出一种改进的字段权重计算方法。改进方法综合主观经验较强的等级法和

客观性的统计法来计算字段的权重，使字段权重的设置更加科学合理，进而有助

于提高数据相似度计算的精确度。同时，改进的滑动窗口策略也有助于算法检测

精确度的提升。通过对比实验验证了本文的改进算法在查全率，查准率等评价指

标上均优于其他算法。

（3）针对现有的船舶轨迹缺失数据修复算法修复精确度低的问题，首先解

决了由轨迹数据中的错误数据引起的伪连续问题，然后提出一种针对船舶轨迹

缺失数据的修复算法。首先构建船舶运动状态矢量模型，将船舶的空间位置与时

间联系起来，然后基于多项式插值的思想，构建船舶空间位置的插值函数，充分

结合已有的船舶信息来优化参数，以实现对轨迹缺失数据的精确修复。通过对比

2470 Wizard2 - IVD

Automatic Gamma Counters

DescriptionThe 2470 Wizard2® gamma counters present the next generation instrumentation for gamma counting. Wizard2 unites the flexibility, robustness and accuracy for applications requiring gamma radiation analysis. One, two, five or ten independent well-type detectors, automatic or manual counting mode, multi-user capability and multitasking operation environment provide flexible and efficient sample processing.

The instrument can be used as a stand-alone system or

it can be easily networked. Wizard2 is available in either 550-sample or 1000-sample conveyor versions.

Standard Features• Detector system consists of detectors made of thallium activated, sodium iodide crystals. The crystal height is 50 mm (2.0 in) and diameter is 32 mm (1.26 in). 4π counting geometry ensures optimal counting efficiency of the sample.

2408

2404MODELS

Programmer/Controllers

Product data

The 2404/2408 is a versatile, high stability temperature or process controller, with self

and adaptive tuning, in 1/4 DIN and 1/8 DIN sizes. It comes with a standard 8 segment

setpoint programmer, with options for one, four or twenty programs of 16 segments

each.

It has a modular hardware construction which accommodates a wide range of plug-in

modules. It will accept up to three I/O modules and two communication modules. Two

Digital inputs and an optional alarm relay are included as part of the fixed hardware

build. The hardware is configurable for heating, cooling, alarms and other functions. A

transmitter power supply option is available, as is a 5 or 10V transducer supply option.

The 2404/2408 is fully configurable on-site.

The programmer can have up to 8 programmable outputs which can be set in each