融合UWB与INS的消防员室内定位与NLOS检测算法

融合超宽带（UWB）和惯性导航系统（INS）能够实现消防员室内精确定位。为实现UWB的非视距（NLOS）误差检测,设计一种双级EKF框架。该框架以松耦合形式实现UWB/INS的数据融合,通过INS获取的初始位置估计坐标以检测UWB测量值的NLOS误差,根据检测结果计算残差矩阵来动态调整融合滤波器的测量噪声矩阵,以达到缓解NLOS误差的目的。实验结果表明,与三角不等式原理检测算法和无NLOS检测的UWB/INS简单融合算法相比,所提NLOS检测算法具备良好的检测能力、较强的稳定性及较高的定位精度。     

Psychophysiological responses in experienced firefighters undertaking repeated self-contained breathing apparatus tasks

In order to safely and effectively extinguish fires and rescue life, firefighters are required to routinely wear self-contained breathing apparatus (SCBA), yet little is known about the specific physiological and psychological demands associated with repeated exposure to tasks that require SCBA. A total of 12 experienced firefighters took part in a series of commonly encountered SCBA activities: free search, guideline search and live firefighting tasks under room temperature (～20°C) and extreme heat (～180°C) conditions to assess changes in heart rate, blood pressure, mood, perceived workload and air usage. Findings demonstrate that live firefighting is associated with greater perceived exhaustion than free search or guideline exercises; however, all tasks lead to high cardiovascular demand regardless of the presence of heat. No significant impact of task upon mood and no significant differences between the perceived demands of guideline, free search and live firefighting exercises were found.

Practitioner Summary: This study considered the physiological and psychological responses of firefighters undertaking SCBA exercises. Although live firefighting is associated with greater perceived exertion, the absence of differences in psychological domains between exercises demonstrates that task demands are not always dependent upon the presence of fire and that all tasks are mentally challenging.     

对GB26465—2011《消防电梯制造与安装安全规范》的解读

对GB26465—2011《消防电梯制造与安装安全规范》进行了比较全面的解读。说明了消防员电梯与消防电梯的概念，消防电梯的定义及消防电梯设置范围；对消防电梯制造与安装中的安全要求和防护措施进行了阐述。     

Correlates of work injury frequency and duration among firefighters.

This study examined demographic, personality, and economic incentive correlates of workplace injuries suffered by 171 firefighters over a 12-yr period. Results showed that female firefighters experienced more injuries than male firefighters. Several Minnesota Multiphasic Personality Inventory (MMPI) scales (Conversion Hysteria, Psychopathic Deviate, and Social Introversion) were positively related to injury frequency. Regression analyses revealed that age, tenure, gender, marital status, type of injury, and wage variables were significant when predicting the duration of injuries as well as an interaction between marital status and gender. Two MMPI scales (Psychopathic Deviate and Schizophrenia) were also significantly related to injury duration. Indemnity cost estimates were calculated. The results underscore the importance of distinguishing the duration of injury from the occurrence of injury. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Impedance plethysmography as a tool for assessing exertion-related blood flow changes in the lower limbs in healthy subjects

Impedance plethysmography, also known as the impedance test, the blood flow test, or impedance phlebography, is a non-invasive test that measures blood flow in the vessels of the peripheral vascular system by monitoring changes in electrical resistance (impedance) to detect deep thrombosis (blood clots or thrombophlebitis).The aim of our study was to use this technique for assessing changes in blood flow in the lower limbs in healthy subjects wearing protective footwear while walking.The test was performed on a group of 30 professional firefighters (age 30.7 ± 4.5, BMI 25.1 ± 3). Blood flow was monitored in the peripheral vascular system of the lower limbs during walking on a treadmill. The testing protocol consisted of the following three phases: warm-up, exercise, and rest.In order to identify differences between the three phases of the study, analysis of variance (ANOVA) with repeated measures was conducted. The statistically significant parameters of blood flow in the lower limbs were the impedance ratio (IR) (p < 0.001), slope ratio (SR) (p < 0.001), crest width (CW) (p < 0.001), and alternative blood flow (ABF) (p < 0.001). All of them showed an upward trend.The study confirmed the validity of impedance plethysmography as a non-invasive technique for measuring blood flow changes in the lower limbs in healthy subjects, especially under non-steady-state conditions, such as walking. This technique provides valuable quantitative data.Therefore, impedance plethysmography may be considered a reliable research method enabling evaluation of local blood flow in healthy subjects under different conditions.     

Measuring the effects of structural turnout suits on firefighter range of motion and comfort

Abstract

Range of motion (ROM) can be restricted by wearing stiff and bulky clothing. This is particularly true of firefighter suits that are constructed using fabric layers to provide thermal protection from fire. This study developed an evaluation technique to quantify the loss of mobility associated with wearing firefighters’ protective suits that were deliberately selected to represent similar ergonomic design features. The ROM of 10 firefighters was measured using electro-goniometers attached to their bodies while they wore uniforms and a reference outfit, and performed specific movements. The most restrictive uniform is the Bulky suit that contained additional layers of materials in sleeves and on the knees. The Traditional Suit was more ROM restrictive than Ergonomic. The subjective evaluation of suits supported the objective assessments provided by the electro-goniometers. A 3-D body scanning technique was employed to establish a correlation between the bulkiness of firefighter outfits and subject ROM.

Practitioner Summary: This study presents a methodology for measurements of range of motion (ROM) in firefighters wearing personal protective equipment (PPE). Even small differences in designs of PPE may impact firefighters’ ROM, which can be detected by electro-goniometers providing measurements if they are attached along the joint to measure limb angular movement.     

Impaired specific autobiographical memory as a risk factor for posttraumatic stress after trauma.

This study tested the proposal that impaired retrieval of specific autobiographical memories is a risk factor for psychological disturbance after trauma exposure. Trainee firefighters (N = 60) were assessed during training (before trauma exposure) on the Autobiographical Memory Test, Clinician Administered PTSD Scale, Beck Depression Inventory (BDI-II), and Traumatic Events Questionnaire. Participants were reassessed 4 years later (N = 46) on the Posttraumatic Diagnostic Scale and BDI-II. All participants had been exposed to multiple traumatic events, and 15% met criteria for posttraumatic stress disorder. Impaired retrieval of specific memories in response to positive cues prior to trauma exposure significantly predicted posttraumatic stress severity after trauma exposure. These findings provide initial evidence that impaired specific retrieval of memories may be a risk factor for posttraumatic stress. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The PHLAME (Promoting Healthy Lifestyles: Alternative Models' Effects) firefighter study: Testing mediating mechanisms.

This paper examines the mechanisms by which PHLAME (Promoting Healthy Lifestyles: Alternative Models' Effects), a health promotion intervention, improved healthy eating and exercise behavior among firefighters, a population at high risk for health problems due to occupational hazards. In a randomized trial, 397 firefighters participated in either the PHLAME team intervention with their work shift or a control condition. Intervention sessions taught benefits of a healthy diet and regular exercise, and sought to improve social norms and social support from coworkers for healthy behavior. At posttest, team intervention participants had increased their fruit and vegetable consumption as compared to control participants. An increase in knowledge of fruit and vegetable benefits and improved dietary coworker norms partially mediated these effects. Exercise habits and VO2 max were related to targeted mediators but were not significantly changed by the team intervention. Partial support was found for both the action and conceptual theories underlying the intervention. Our findings illustrate how an effective program's process can be deconstructed to understand the underpinnings of behavior change and refine interventions. Further, fire stations may improve the health of firefighters by emphasizing the benefits of healthy diet and exercise behaviors while also encouraging behavior change by coworkers as a whole. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Metabolic demands of simulated firefighting tasks

Firefighters having higher cardiovascular fitness completed a series of simulated firefighting tasks more quickly than those having lower fitness. These results support the need of a high level of cardiovascular fitness for firefighters to ensure not only their safety, but that of fellow firefighters and rescue victims.     

新入职集训期消防员心理健康状况及社会影响因素探究

为了了解新入职集训期消防员心理健康状况,探讨社会影响因素对心理健康的影响,采用自编的消防员基本信息问卷、SCL90症状自评量表、SAS焦虑自评量表和SDS抑郁自评量表对某直辖市消防救援总队新入职集训期的569名消防员进行测评,并对其心理健康状况及社会影响因素进行分析。本次测评的消防员心理健康整体状况属于正常水平,优于现职消防员。SCL90总分及各因子分、SAS量表得分、SDS量表得分均显著低于我院同期调查的同直辖市的特勤支队消防员、某自治区森林消防支队消防员及中国成人常模。logistic回归分析提示：集训期消防员心理健康的显著影响因素为退伍军人、父母身体健康、年龄、饮酒、身体伤害、学历。通过测评分析,了解了新入职集训期消防员心理健康状况,准确识别集训期消防员心理健康的影响因素,对于开展集训期消防员的心理干预具有重大的指导意义。