The health status of officers and men of PLA plays an important role in fighting capacity. This article analyzed the close relationship between modern high tech war and the health status of officers and men of PLA and emphasized the necessity of monitoring the health status of officers and men and elucidated its main content, such as basic vitalreference monitoring under low physiological-psychological load conditions;establishment of health information telecommunication network ;data min ing and fusion ,and information storage The health status information of officers and men of PLA can be obtained in nature condition through means of technologies,which will advantage maintaining health status of officers and men of PLA and security of military training

BACKGROUND:In some clinical applications or special work conditions,extremely intonse 50 Hz AC intefference exists.As the amplifier's output reaches or is close to saturation,it cannot be suppressed by general anti-interference circuits or software algorithms.Themfore,the hardware circuit must be impreved to suppress this interference,thus obtajning the desired signals.OBJECTIVE:To introduce a biopotential amplifier,which can effectively suppress the impact of 50 Hz AC interference on the weak biomedical signals.DESIGN:Create a circuit model based on the advanced theoretical analysis,then make software emulation and finally design the actual circuit implementation.SETTINGS:the 305 Hospital of Chinese PLA:Institute of Aviation Medicine,Air Force of CIIinese PLA.MATERIALS:The experimentaIinstruments and analytical software were provided by the Institute of Aviation Medicine,Air Force of Chinese PLA:the high-voltage electrical field environment was provided by the 305 Hospital of Chinese PLA.METHODS:The first step was theoretical analysis at the Institute of Aviation Medicine,Air Force of Chinese PLA in 2005,then the 50 Hz anti-reference model was created.After that,the following three anti-reference measures were put forward:①Enhancing the common-mode input impedance of the overall circuit to remove the interference caused by the imbalance electrode impedance;②reducing the equivalent common mode input impedance of the instrument amplifier in the circuit by using a current source controlled by the comlnou mode voltage;③using the driven-right-leg circuit to reduce the common mode voltage.Moreover,emulation analysis was made for the above circuit model by using the circuit emulation software TINA PRO.Through ceaseless improvement of the circuit model,the correct emulation results were obtained.In 2006,the Circuit model helped us realize the electrocardiogram(ECG)amplifier that could suppress the 50 Hz AC intefference effectively in intense interference environments.And that amplifier was put into practical use in the high-voltage electrical field environment produced by the high-voltage electrical field treatment equipment in the 305 Hospital of PLA.The result was satisfying:the 50 Hz AC interference was suppressed effectively and the high-quality ECG signals were obtained.MlAIN OUTCOME MEASURES:Common-Mode Rejection Ratio(CMRR)and the frequency spectrum of signals obtained in intense intefference environment,which are used to assess the ability against the 50 Hz AC interference.RESULTS:A 100 ù resistor or a 200 kù resistor were connected in series in the input loop so as to produce the imbalance electrode impedance status.When the imbalalice electrode impedance was 100 ù,the amplifier output was 1.69 Mv,and CMRR was 125.8 Db.When the imbalance electrode impedance was 200 k ù,the amplifier output was 1.78 Mv,and CMRR was 125.3 Db.Two voltage sources(20 Hz,amplitude of peak to peak value 50 ì V,opposite phases)were used to produce differential mode signals.The amplification gain was 1000 times.In the input loop of the circtilt mentioned above,a 200 kù resistor was connected in series to create the inabalance electrode impedance status.The amplifter output the peak-to-peak value 50 Mv.The fast Fourier transform(FFT)frequency spectrum of the output wave contained no 50 Hz spectrum line.CONCLUSION:Through the emulation experiment and the real application.we can all find that the amplifier has good signal amplification performance and anti-interference capabillty in intensive 50 Hz AC interference environments and severe imbalance electrode impedance Status.

A continuous noninvasive method for blood pressure (BP) estimation by pulse wave transit time (PWTT) is described. A constant linear relation is available between PWTT and BP, but characteristic parameter for the relation is different for different persons. According to hydrostatics, BP in some vessel changes with different body postures. In this paper, the difference, i.e. △BP, between two BP values with different body postures is gained. ECGs and surface pulse waves are also obtained, and then values of PWTT are calculated. Through the A BP and PWTT acquired above, parameter b of BP equation can be determined, and then parameter a is computerized through the measurements and one BP value. Thus a BP equation is got, which can be used to estimate BP values through continuous measurement of PWTT. Compared with the value from invasive BP measurement, the value from this method has an error rate less than 5%. The method is feasible for noninvasive continuous BP monitoring.

Various vertebrae taken from 34 cadavers were tested separately on a Schenck tester with static and dynamic loads to evaluate their strengths. For an impact lasting for a relatively long period, the tolerance of each vertebra is under 21 G. Through an electronic model of human spine based on its dynamic characteristics under the impact of an opening parachute, an allowable magnitude of impact was estimated as 25 G for 50 ms. This data might be of use for our aviation industry.

Objective In order to carry out the research of the non-invasive core temperature measurement,the paper designs a portable sixteen channels temperature measurement system. Method Using MCU MSP430F149,this paper applies the technology of analog signal acquisition and digital signal process to establish a multi-channel temperature system. Result The system can store and send the temperature signals through wire and wireless communication mode. Conclusion The system is stable and reliable,and the precision of the system satisfies the clinical demand.

Objective:To compare the morphology of dental arch and base bone between oral breathing and nasal breathing children.Methods: A simultaneous measurement system was applied to test oral and nasal respiration.34 oral breathing children and 34 nasal breathing children aged 11 to 14 years old were selected.The parameters of the morphology of dental arch a nd base bone were measured on the record models.Results:① The oral breathing children showed higher palatal vault,and narrower maxillary b ase bone.The configurations of maxillary base bone were comparatively narrower a nd longer.②The oral breathing children's medial and posterior parts of arches o f maxilla were longer,and the configurations of maxillary arch were comparativel y narrower and longer.The configurations of mandible posterior arch were compara tively narrower and longer too.Conclusion:Oral breathing m ay lead to morphological changes in dental arch and base bone in children.

Warfighter physiological status monitor (WPSM) is a new device for noninvasive biomedical measurements for soldier vital signs in operational environments. This paper gives an introduction to the WPSM and analyses the key technologies to design WPSM. The wearable technology can provide a systematic way of monitoring the vital signs of humans in a unobstrusive manner. In this paper the wearable technology is used to design WPSM to fulfill non-instrusive vital signs detection.

Objective To develop an image analyzing procedure for automatic localization of facial features on infrared images.Methods An unsupervised local and global features extraction method was adopted for the localization of facial features of frontal view face image.First,a threshold was used to segment the image into foreground and background,and the nose was localized by considering the symmetry of the face.Second,Harris operator was adopted to detect interest points in a rectangular area covering all the facial features,and then local maximum of the interest points were detected.And finally,K-means clustering method was used to cluster the points and obtain the facial features localization.Results The experimental result of 100 images demonstrated that the procedure could automatically localize eyes,nose,mouth,and distinguish the feature areas.Conclusion The proposed infrared image analyzing procedure based on Harris operator and K-means clustering can be used to locate facial features on infrared image more rapidly and reliablely.

砄bjective: To study the relationship between respiratiory mode and dental occlusion. Methods: UI SN, LI MP, UI LI, OB, OJ and M1～M2 were measured with cephalometric technic in 34 oral breathing children and 34 nasal breathing children (aged 11～14 years) . Results: UI LT and OB in the children with oral breathing were smaller than those in the children with nasal breathing( P 0.05). Conclusion: The children with oral breathing may have smaller oberbite and more proclined dental arch.

Objective To extract breathing pattern parameters during sleep and get the varying law of NREM and REM sleep stages. Method A newly designed respiratory inductive plethysmography (RIP) and a polysomnography (PSG) are utilized to record whole-night-sleep data simultaneously. The breathing pattern parameters obtained by RIP are dealt with according to the results of sleep stages and sleep apnea by PSG. Then the rule found out and summarized from the experiment is applied to distinguish REM sleep. Conclusion RC/VT can be used as an effective parameter to differentiate NREM and REM sleep. Using this parameter, the results of RIP totally accord with the results of PSG.