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JOURNAL OF ELECTROCARDIOLOGY 1975年第1期8卷 53-59页

作者： DOWER, GE OSBORNE, JA SURANYI, O STEWART, DE BONHAM, K SHAUGHNESSY HOSP DEPT POLAR CARDIOGVANCOUVERBRITISH COLUMBICANADA VANCOUVER GEN HOSP DEPT CARDIOLVANCOUVERBRITISH COLUMBICANADA

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NONPAROXYSMAL JUNCTIONAL TACHYCARDIA IN ACUTE MYOCARDIAL-INFARCTION - COMPUTER-ASSISTED DETECTION

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AMERICAN JOURNAL OF CARDIOLOGY 1975年第6期35卷 824-830页

作者： KNOEBEL, SB RASMUSSEN, S LOVELACE, E ANDERSON, GJ INDIANA UNIV SCH MEDKRANNERT INST CARDIOLINDIANAPOLISIN INDIANA UNIV SCH MEDDEPT MEDINDIANAPOLISIN INDIANA UNIV SCH MEDDEPT COMP SERVINDIANAPOLISIN VET ADM HOSP INDIANAPOLISIN HENDRICKS CTY HOSP DANVILLEIN

Thirty consecutive patients with acute myocardial infarction had continuous magnetic tape recording of their electrocardiograms (lead II) for the period of their stay in the coronary care unit. Analysis of the 24 hour tape recordings was implemented on a Honeywell model 316 digital computer. In the first 24 hours after admission to the coronary care unit, 12 of the 30 patients (40 percent) exhibited nonparoxysmal junctional tachycardia; in 5 the arrhythmia was not recognized by conventional monitoring techniques. For the subsequent 3 days, the incidence rate of the arrhythmia was 13 percent for the first 48 hours and 3 percent for 72 hours. Although the mortality rate in patients with nonparoxysmal junctional tachycardia was greater than in patients not demonstrating the arrhythmia (33 versus 6 percent), there was a greater percentage of patients with anterior infarction in the former group; therefore, mortality may have been related to site of infarction rather than being reflective of the arrhythmia or its associated pathophysiologic state. Of possible significance is the association of a greater degree of sinus arrhythmia with nonparoxysmal junctional tachycardia. The incidence of nonparoxysmal junctional tachycardia in this group of patients was greater than previously reported. It is possible that computer tape analysis may have provided more accurate recognition of the arrhythmia and, thus, more realistic incidence data. The association of nonparoxysmal junctional tachycardia with sinus arrhythmia could only have been recognized by computer technique. The computer system is not a diagnostic system but rather a tape review method.

关键词：模拟数字转换心律失常窦性/病因学冠心病重症监护病房诊断计算机辅助/仪器和设备诊断计算机辅助/方法心电描记术/仪器和设备心电描记术/方法心肌梗死/并发症心肌梗死/死亡率预后心动过速/病因学心动过速/死亡率人类

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Cephalometric digitization: A determination of the minimum scanner settings necessary for precise landmark identification

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AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS 2001年第5期119卷 472-481页

作者： Held, CL Ferguson, DJ Gallo, MW St Louis Univ Grad Sch St Louis MO 63103 USA

This study focused on the interpretation of scanned cephalometric images after the digitization of the original analog film, with a variety of standard scanner settings. The purpose was to determine the minimum allowable resolution, grayscale, and color settings of these digital images, without compromising the precision of orthodontic landmark identification. Forty-nine orthodontic residents and faculty at Saint Louis University identified 13 landmarks in 3 separate trials on either an original lateral cephalogram or 1 of 6 digitized radiographic images. They also subjectively assessed the quality of the image. Ability to identify landmarks did not differ significantly among the groups tested. Conversely, opinions of image quality differed significantly among the groups. Participants found the quality of the grayscale images without color to be poorer than that of the original film but could detect differences only at resolution extremes. Prediction of ability to identify landmarks was substantially greater for higher resolution images. In conclusion, the scanner settings used in the digitization of a cephalometric film did not matter significantly when standard settings were used. In addition, subjective opinion of image quality was predictive of how precisely landmarks were identified when the resolution was relatively high.

关键词： Analog-Digital Conversion Cephalometry Radiographic Image Enhancement 模拟数字转换测颅法 X线影像增强 Scanner Analog-digital conversion Image quality St. Louis encephalitis virus cephalometry Radiographic Image Enhancement landmarks grayscale images digitization

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Acoustic rhinometry: A study of transient and continuous noise techniques with nasal models

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AMERICAN JOURNAL OF RHINOLOGY 1999年第4期13卷 323-329页

作者： Djupesland, PG Qian, W Furlott, H Rotnes, JS Cole, P Zamel, N Univ Oslo Dept Otolaryngol Oslo Norway

The objective of this study is to compare the properties of two of the most frequently used acoustic rhinometers: the EcoVision (Hood Laboratories, USA) using the transient technique, and the Rhin2100 (RhinoMetrics, Denmark) using the continuous wide-band technique. In the wide-band rhino,meter (Rhin2100), the transient analog signals of traditional rhinometers (EcoVision), are replaced by a digitally produced continuous wide-band noise signal. Tubular models and a plastic model produced by stereolithography (SLA), representing the mie replicate of the nasal anatomy were cued to compare the accuracy of the two rhinometers. The effect of increasing angling (0-50 degrees) between the sound wave tube and the cavity was evaluated in a tubular model. The curves obtained with the two rhinometers showed close similarity, and the acoustically derived volumes correlated well with the volumes of tubular (% error < 4%) as well as the complex nasal model (% error < 10.5%). Both rhinometers underestimated the minimum cross-sectional area (MCA) of the complex nasal model (mean % error complex model: Rhin2100 = -7.6%, EcoVision = -13%). The effect of increasing the angle between the nose adapter and the tubular models was small for both rhinometers (CV < 3% for MCA and CV < 1% for volumes). The similar, and in general, high accuracy oft he two rhinometers evaluated, particularly in the complicated geometry of the SLA model, is an indication of the reliability of both. The small effect of changing the angle between the nose adapter and the models was unexpected and very encouraging. Nevertheless, some minor differences in performance and capabilities of the two rhinometers might influence interpretation and comparison of results. Further comparisons in a clinical setting are under current investigation.

关键词：声学/仪器和设备模拟数字转换伪迹设备设计模型解剖学鼻/解剖学和组织学可重复性结果信号处理计算机辅助声音/诊断应用人类

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Digital imaging in the assessment of facial deformity

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BRITISH JOURNAL OF ORAL & MAXILLOFACIAL SURGERY 1999年第2期37卷 94-98页

作者： Fanibunda, KB Thomas, PR Newcastle Univ Sch Dent Dept Oral & Maxillofacial Surg Newcastle Upon Tyne NE2 4BW Tyne & Wear England Newcastle Univ Dept Geomat Newcastle Upon Tyne NE2 4BW Tyne & Wear England

A combination of digital imaging and conventional radiographic techniques has been used to obtain a life-size composite image of the facial soft tissue profile, the skull, and the teeth, anatomically superimposed on each other. The system overcomes major problems associated with assessment of facial deformity such as magnification, the exposure of photographs and radiographs from different positions, radiographs with overexposed soft tissue profiles, lengthy procedures in photographic studios, and, in addition, enables a degree of partial automation in the management of patients.

关键词：模拟数字转换测颅法/仪器和设备测颅法/方法面部/解剖学和组织学图像处理计算机辅助/方法颌面畸形/放射摄影术摄影术/仪器和设备 X线影像增强放射摄影术牙科/方法放射摄影术牙科数字人类

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Adaptive Digital Calibration of Amplifier Finite Gain Effects and C-ratio Matching Errors for MASH Modulators

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High Technology Letters 2004年第4期10卷 15-18页

作者：冯晖 Lin Zhenghui Electronic Engineering Department Shanghai Jiaotong University Shanghai 200030 P.R.China

Cascaded sigma-delta (MASH) modulators for higher order oversampled analog-to-digital conversion rely on precise matching of contributions from different quantizers to cancel lower order quantization noise from intermediate delta-sigma stages. This paper studies the effect of analog imperfections in the implementation, such as finite gain of the amplifiers and capacitor ratio mismatch, and presents an adaptive algorithm and implementation architectures for digital correction of such analog imperfections. Behavioral simulations on 1-1-1 oversampled converters demonstrate over 10dB improvements in signal-to-noise and over 20 dB improvements in dynamic range performance.

关键词：求和增量调节器 MASH 数字校准技术噪音 A/D转换模拟数字转换

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Spectral analysis of heart rate and blood pressure variability in primary Sjogren's syndrome

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ANNALS OF THE RHEUMATIC DISEASES 2002年第3期61卷 232-236页

作者： Barendregt, PJ Tulen, JHM van den Meiracker, AH Markusse, HM Med Centrum Rijnmond Zuid Dept Rheumatol Rotterdam Netherlands Univ Hosp Dijkzigt Dept Psychiat NL-3015 GD Rotterdam Netherlands Univ Hosp Dijkzigt Dept Internal Med NL-3015 GD Rotterdam Netherlands

Background: Autonomic dysfunction has been described in primary Sjogren's syndrome (SS). Objective: To investigate the circulatory autonomic regulation in patients with primary SS by power spectral analysis of heart rate and blood pressure variability. Methods: Forty three (42 female) patients with primary SS, mean age 52 years (range 23-80), with a mean disease duration of eight years (range 1-30) and 30 (15 female) healthy controls, mean age 43 years (range 21-68) were studied. In each patient blood pressure, heart rate, and respiration were measured continuously during supine rest and orthostatic challenge (60 head-up tilt). Power spectral analysis was performed to determine possible differences in short term sympathetic and parasympathetic autonomic regulation between patients and controls. Furthermore, spectral parameters were studied in relation to illness severity and disease duration of the patients with primary SS. Results: After controlling for differences in age, heart rate variability of the mid-frequency band and the variation coefficient of systolic blood pressure were significantly lower in patients with primary SS than in controls during supine rest. During 60 tilt patients with primary SS showed a significantly higher mean heart rate, mean systolic blood pressure, and variation coefficient of diastolic blood pressure, and a significantly lower baroreflex index than controls. After controlling for age, no differences were found either in heart rate variability, blood pressure results, and baroreflex sensitivity during supine rest and tilt between the subgroups divided according to disease duration, Schirmer test results, or between the subgroups with different fatigue scores. No differences were found in spectral data between the groups with and without positive antinuclear antibody serology. Conclusion: For the group no differences in sympathetic and parasympathetic cardiac control were seen between patients with primary SS and controls, as assessed

关键词：模拟数字转换自主神经系统/生理学压力感受器反射/生理学血压/生理学病例对照研究傅里叶分析心率/生理学呼吸疾病严重程度指数干燥综合征/病理生理学仰卧位成年人老年人老年人 80以上女(雌)性人类男(雄)性中年人

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影像传感器、使用于其的模拟数字讯号处理方法和装置

影像传感器、使用于其的模拟数字讯号处理方法和装置

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作者：许晨声邱瑞德中国台湾新竹科学工业园区

使用于影像传感器的模拟数字讯号处理方法，包括：提供一全局式模拟数字转换器，该全局式模拟数字转换器可用以将该影像传感器之一像素数组之所有像素之复数个模拟讯号转换为复数个数字讯号；提供一并列式模拟数字转换器，该并列式模拟... 详细信息

标准号: CN107948553A

使用于影像传感器的模拟数字讯号处理方法，包括：提供一全局式模拟数字转换器，该全局式模拟数字转换器可用以将该影像传感器之一像素数组之所有像素之复数个模拟讯号转换为复数个数字讯号；提供一并列式模拟数字转换器，该并列式模拟数字转换器可用以通过复数个模拟数字转换电路分别将该像素数组于不同列上之复数个像素之复数个模拟讯号转换为复数个数字讯号；以及动态切换选择该全局式模拟数字转换器及该并列式模拟数字转换器的其中之一，对该像素数组之复数像素之数据执行一模拟数字转换。

关键词：模拟数字转换器复数像素数组并列式影像传感器模拟讯号数字讯号可用像素全局模拟数字转换电路模拟数字转换动态切换复数像素模拟数字数据执行讯号处理转换

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FUNCTIONAL-ANALYSIS OF CHEMICAL SYSTEMS INVIVO USING A LOGICAL CIRCUIT EQUIVALENT .5. MOLECULAR BIOLOGICAL INTERPRETATION OF SELF-REPRODUCING AUTOMATA THEORY AND CHEMICO-PHYSICAL INTERPRETATION OF INFORMATION IN BIOLOGICAL-SYSTEMS

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JOURNAL OF THEORETICAL BIOLOGY 1975年第1期53卷 223-237页

作者： SUGITA, M AOYAMA GAKUIN UNIV COLL SCI & ENGNSETAGAYATOKYOJAPAN

A mathematical interpretation of the molecular biological facts is attempted and a hybrid automaton model of the genetic system and the continuous biochemical one is considered. For the continuous system under the control of the genetic one, one may take the KM (kinematic machine) of von Neumann. Thus the total system of the molecular automaton, the genetic information of DNA and the hybridized continuous system or KM may make a self-reproducing automaton. This idea is applied to the cell cycle, G 1 , S, G 2 and M, during which duplication of DNA and cell division takes place, and a computer simulation is tried. The change of the continuous system may be interpreted as the response to the digital information, which may be the permanent genetic one as well as a temporal one like the open or closed state. This change is a kind of DA conversion. Then the digital feedback from the continuous system to the temporal state of the operons may be a kind of AD (analogue-digital) conversion, and the combination of the DA and the AD conversion may correspond to a delay unit which is necessary for the molecular automaton. As there are difficulties in determining the system parameters of the continuous system in the living state, the continuous changes are again replaced by the delay units of various intervals corresponding to the DA and the AD conversions and thus an automaton model having various delay constants is considered for the case of a cell cycle. For this automaton theory a chemico-physical interpretation of the concept of information is given, i.e. the information is an indirect action affecting the free energy of activation of the rate processes. Then the fluxes of the rate processes correspond to the response to the information.

关键词：模拟数字转换细菌蛋白质类细胞分裂 DNA复制 DNA 细菌/生物合成指导DNA的RNA聚合酶类电磁学现象酶诱导酶类大肠杆菌/代谢反馈遗传学微生物信息论动力学有丝分裂模型生物学分子生物学操纵子 RNA 细菌/生物合成热力学

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一种CAMAC电荷数字转换器

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核电子学与探测技术 1984年第5期 286-290页

作者：屈云河中国科学院高能物理研究所

本文介绍了一种CAMAC电荷数字转换器的原理、特点和主要技术性能。给出了计算机在线测量的结果。测量满量程:256pC;灵敏度:0.25pC每个计数;积分非线性≤0.15％;数字分辨:10位(0.1％)。

关键词：电荷灵敏型威尔金逊变换法模拟数字转换 CAMAC插件

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