Cross-Modal Supervised Human Body Pose Recognition Techniques for Through-Wall Radar.

Through-wall radar human body pose recognition technology has broad applications in both military and civilian sectors. Identifying the current pose of targets behind walls and predicting subsequent pose changes are significant challenges. Conventional methods typically utilize radar information along with machine learning algorithms such as SVM and random forests to aid in recognition. However, these approaches have limitations, particularly in complex scenarios. In response to this challenge, this paper proposes a cross-modal supervised through-wall radar human body pose recognition method. By integrating information from both cameras and radar, a cross-modal dataset was constructed, and a corresponding deep learning network architecture was designed. During training, the network effectively learned the pose features of targets obscured by walls, enabling accurate pose recognition (e.g., standing, crouching) in scenarios with unknown wall obstructions. The experimental results demonstrated the superiority of the proposed method over traditional approaches, offering an effective and innovative solution for practical through-wall radar applications. The contribution of this study lies in the integration of deep learning with cross-modal supervision, providing new perspectives for enhancing the robustness and accuracy of target pose recognition.

Efficient Model-Based Anthropometry under Clothing Using Low-Cost Depth Sensors.

Measuring human body dimensions is critical for many engineering and product design domains. Nonetheless, acquiring body dimension data for populations using typical anthropometric methods poses challenges due to the time-consuming nature of manual methods. The measurement process for three-dimensional (3D) whole-body scanning can be much faster, but 3D scanning typically requires subjects to change into tight-fitting clothing, which increases time and cost and introduces privacy concerns. To address these and other issues in current anthropometry techniques, a measurement system was developed based on portable, low-cost depth cameras. Point-cloud data from the sensors are fit using a model-based method, Inscribed Fitting, which finds the most likely body shape in the statistical body shape space and providing accurate estimates of body characteristics. To evaluate the system, 144 young adults were measured manually and with two levels of military ensembles using the system. The results showed that the prediction accuracy for the clothed scans remained at a similar level to the accuracy for the minimally clad scans. This approach will enable rapid measurement of clothed populations with reduced time compared to manual and typical scan-based methods.

Are there any completely sterile organs or tissues in the human body? Is there any sacred place?

The human microbiome comprises an ample set of organisms that inhabit and interact within the human body, contributing both positively and negatively to our health. In recent years, several research groups have described the presence of microorganisms in organs or tissues traditionally considered as 'sterile' under healthy and pathological conditions. In this sense, microorganisms have been detected in several types of cancer, including those in 'sterile' organs. But how can the presence of microorganisms be detected? In most studies, 16S and internal transcribed spacer (ITS) ribosomal DNA (rDNA) sequencing has led to the identification of prokaryotes and fungi. However, a major limitation of this technique is that it cannot distinguish between living and dead organisms. RNA-based methods have been proposed to overcome this limitation, as the shorter half-life of the RNA would identify only the transcriptionally active microorganisms, although perhaps not all the viable ones. In this sense, metaproteomic techniques or the search for molecular metabolic signatures could be interesting alternatives for the identification of living microorganisms. In summary, new technological advances are challenging the notion of 'sterile' organs in our body. However, to date, evidence for a structured living microbiome in most of these organs is scarce or non-existent. The implementation of new technological approaches will be necessary to fully understand the importance of the microbiome in these organs, which could pave the way for the development of a wide range of new therapeutic strategies.

Fast Human Motion reconstruction from sparse inertial measurement units considering the human shape.

Inertial Measurement Unit-based methods have great potential in capturing motion in large-scale and complex environments with many people. Sparse Inertial Measurement Unit-based methods have more research value due to their simplicity and flexibility. However, improving the computational efficiency and reducing latency in such methods are challenging. In this paper, we propose Fast Inertial Poser, which is a full body motion estimation deep neural network based on 6 inertial measurement units considering body parameters. We design a network architecture based on recurrent neural networks according to the kinematics tree. This method introduces human body shape information by the causality of observations and eliminates the dependence on future frames. During the estimation of joint positions, the upper body and lower body are estimated using separate network modules independently. Then the joint rotation is obtained through a well-designed single-frame kinematics inverse solver. Experiments show that the method can greatly improve the inference speed and reduce the latency while ensuring the reconstruction accuracy compared with previous methods. Fast Inertial Poser runs at 65 fps with 15 ms latency on an embedded computer, demonstrating the efficiency of the model.

Vibration reduction of human body biodynamic response in sitting posture under vibration environment by seat backrest support.

Four-degree-of-freedom (4-DOF) human-chair coupling models are constructed to characterize the different contact modes between the head, chest back, waist back and backrest. The seat-to-head transfer ratio (STHT) is used as an evaluation metric for vibration reduction effectiveness. The simulated vibration reduction ratio of the model is close to the experimental results, which proves the validity of the model. The peak STHT is obviously reduced (P < 0.05, T-test) with seat-backrest support. The experiments show that supporting the head ( a 1 , P < 0.05, Wilcoxon matched-pairs signed ranks) has the best vibration reduction effect (21%), supporting the chest back ( a 2 , P < 0.05) has a reduced effect (11%), and supporting the waist back ( a 3 , P < 0.05) has the weakest effect (4%). When the upper torso is in full contact with the backrest, the peak STHT curve and resonance frequency are positively correlated with the contact stiffness of the seat surface and negatively correlated with the contact damping. In order to reduce the seat-to-head transfer ratio, the lowest STHT peak and lowest total energy judgments were proposed as the selection methods for the selection of the contact stiffness and damping of the backrest in two environments (periodic and non-periodic excitation), respectively.

Assessing injury risks of reclined occupants in a frontal crash preceded by braking with varied seatbelt designs using the SAFER Human Body Model.

OBJECTIVE: This study investigated the effects of different seatbelt geometries and load-limiting levels on the kinematics and injury risks of a reclined occupant during a whole-sequence frontal crash scenario, using simulations with the Active SAFER Human Body Model (Active SHBM). METHODS: The Active SHBM was positioned in a reclined position (50°) on a semi-rigid seat model. A whole-sequence frontal crash scenario, an 11 m/s2 Automated Emergency Braking (AEB) phase followed by a frontal crash at 50 km/h, was simulated. The seatbelt geometry was varied using either a B-pillar-integrated (BPI) or Belt-in-seat (BIS) design. The shoulder belt load-limiting level of the BPI seatbelt was also varied to achieve either similar shoulder belt forces (BPI_Lower_LL) or comparable upper body displacements (BPI_Higher_LL) to the BIS seatbelt. Kinematics of different body regions and seatbelt forces were compared. The risks of sustaining a mild traumatic brain injury (mTBI), two or more fractured ribs (NFR2+), and lumbar spine vertebral fractures were also compared. RESULTS: During the pre-crash phase, head, first thoracic vertebra, and first lumbar vertebra displacements were greater with the BPI seatbelt than with the BIS, mainly due to the lack of initial contact between the torso and the seatbelt. Pelvis pre-crash displacements, however, remained consistent across seatbelt types. In the in-crash phase, variations in shoulder belt forces were directly influenced by the different load-limiting levels of the shoulder belt. The mTBI (around 20%) and NFR2+ (around 70-100%) risks were amplified with BPI seatbelts, especially at higher load-limiting force. However, the BPI design demonstrated reduced lumbar spine fracture risks (from 30% to 1%). CONCLUSIONS: The BIS seatbelt appears promising, as seen with the reduced mTBI and NFR2+ risks, for ensuring the protection of reclined occupants in frontal crashes. However, additional solutions, such as lap belt load limiting, should be considered to reduce lumbar spine loading.

El cadáver en los sistemas jurídicos colombiano y español: una discusión jurídica, ética y bioética / El cadàver en els sistemes jurídics colombià i espanyol: una discussió jurídica, ètica i bioètica / The corpse in the Colombian and Spanish legal systems: Alegal, ethical and bioethical discussion

El objeto de este trabajo es contribuir al desarrollo conceptual de la categoría jurídica del cadáver en razón a la dificultad que representa la dualidad de sujeto–objeto y que eventualmente puede generar una desprotección al mismo. El estudio se limita a las legislaciones de España y Colombia, cuya regulación, además de estar estrechamente relacionada en sus orígenes, es similar en muchos aspectos. La hipótesis sostenida es que el cadáver es una sustancia corpórea que contiene información personal y en virtud de ello, la bioética se convierte en una fuente útil para su tratamiento y regulación.(AU)

L'objecte d'aquest treball és contribuir al desenvolupament conceptual de la categoria jurídica del cadàver en raó a la dificultat que representa la dualitat de subjecte–objectei que, eventualment, pot generar una des protecció a aquest. L'estudi es limita a les legislacions d'Espanya i Colòmbia, que a més d'estar estretament relacionada en els seus orígens, és similar en molts aspectes. La hipòtesi sostinguda és que el cadàver és una substància corpòria que conté informació personal i en virtut d'això, la bioètica es converteix en una font útil per al seu tractament i regulació.(AU)

The purpose of this work is to contribute to the conceptual development of the legal category of the corpse because of the difficulty represented by the duality of subject–object, which can eventually generate a lack of protection for the corpse. The study is limited to the legislation of Spain and Colombia, whose regulations, in addition to being closely related in their origins, are similar in many aspects. The hypothesis sustained is that the corpse is a corporeal substance that contains personal informationand by this, bioethics becomes a useful source of bioethical principles for its treatment and regulation.(AU)

Skeleton-derived extracellular vesicles in bone and whole-body aging: From mechanisms to potential applications.

The skeleton serves as a supportive and protective organ for the body. As individuals age, their bone tissue undergoes structural, cellular, and molecular changes, including the accumulation of senescent cells. Extracellular vesicles (EVs) play a crucial role in aging through the cellular secretome and have been found to induce or accelerate age-related dysfunction in bones and to contribute further via the circulatory system to the aging of phenotypes of other bodily systems. However, the extent of these effects and their underlying mechanisms remain unclear. Therefore, this paper attempts to give an overview of the current understanding of age-related alteration in EVs derived from bones. The role of EVs in mediating communications among bone-related cells and other body parts is discussed, and the significance of bones in the whole-body aging process is highlighted. Ultimately, it is hoped that gaining a clearer understanding of the relationship between EVs and aging mechanisms may serve as a basis for new treatment strategies for age-related degenerative diseases in the skeleton and other systems.

Changes in the excitability of anterior horn cells in a mental rotation task of body parts.

INTRODUCTION/AIMS: Mental rotation (MR), a tool of implicit motor imagery, is the ability to rotate mental representations of two- or three-dimensional objects. Although many reports have described changes in brain activity during MR tasks, it is not clear whether the excitability of anterior horn cells in the spinal cord can be changed. In this study, we examined whether MR tasks of hand images affect the excitability of anterior horn cells using F-wave analysis. METHODS: Right-handed, healthy participants were recruited for this study. F-waves of the right abductor pollicis brevis were recorded after stimulation of the right median nerve at rest, during a non-MR task, and during an MR task. The F-wave persistence and the F/M amplitude ratio were calculated and analyzed. RESULTS: Twenty participants (11 men and 9 women; mean age, 29.2 ± 4.4 years) were initially recruited, and data from the 18 that met the inclusion criteria were analyzed. The F-wave persistence was significantly higher in the MR task than in the resting condition (p = .001) or the non-MR task (p = .012). The F/M amplitude ratio was significantly higher in the MR task than in the resting condition (p = .019). DISCUSSION: The MR task increases the excitability of anterior horn cells corresponding to the same body part. MR tasks may have the potential for improving motor function in patients with reduced excitability of the anterior horn cells, although this methodology must be further verified in a clinical setting.

Investigating the status of whole-body donation across the United States of America.

Dissection of human body donors is a valuable part of anatomical education, research, and clinical training. In the United States, deceased human bodies are predominantly sourced through whole-body donation programs (BDPs) housed by academic institutions. Due to the lack of information regarding BDPs, the aim of this study was to gather information from US BDPs through a survey to better understand the donation process and standard operating procedures of these programs. In 2021, a Qualtrics survey was distributed to 125 BDPs and yielded responses from 72 program leaders. Collectively, these programs received more than 26,000 whole-body donations annually. Findings show that 70% typically receive enough donations to fit the needs of their institutions, 17% receive a surplus of donations, and 13% receive too few donations. Sixty-eight percent of programs permit next of kin body donation regularly or in times of need, and 44% allow next of kin to make changes to a donor's donation form after death. On average, over 85% of the registered donor population is composed of white individuals, and only 6 institutions have methods in place to promote diversity among their donor population. Overall, there is considerable variability in the operation of BDPs across the United States. These findings can be used to make recommendations about donor enrollment and program operations to ultimately improve the donation process. Future research needs to investigate the opinions and preferences of body donors along with their next of kin on the body donation process and associated policies.

Hierarchical and dynamic relationships between body part ownership and full-body ownership.

What is the relationship between experiencing individual body parts and the whole body as one's own? We theorised that body part ownership is driven primarily by the perceptual binding of visual and somatosensory signals from specific body parts, whereas full-body ownership depends on a more global binding process based on multisensory information from several body segments. To examine this hypothesis, we used a bodily illusion and asked participants to rate illusory changes in ownership over five different parts of a mannequin's body and the mannequin as a whole, while we manipulated the synchrony or asynchrony of visual and tactile stimuli delivered to three different body parts. We found that body part ownership was driven primarily by local visuotactile synchrony and could be experienced relatively independently of full-body ownership. Full-body ownership depended on the number of synchronously stimulated parts in a nonlinear manner, with the strongest full-body ownership illusion occurring when all parts received synchronous stimulation. Additionally, full-body ownership influenced body part ownership for nonstimulated body parts, and skin conductance responses provided physiological evidence supporting an interaction between body part and full-body ownership. We conclude that body part and full-body ownership correspond to different processes and propose a hierarchical probabilistic model to explain the relationship between part and whole in the context of multisensory awareness of one's own body.

Honoring human body donors: Five core themes to consider regarding ethical treatment and memorialization.

Dissection of human body donors is a common component of anatomy curricula, as it provides opportunities for tactile and intellectual engagement unmatched otherwise. Additionally, interaction with human body donors contributes to the "hidden curriculum" of allowing students to begin to ethically practice patient care with empathy, respect, and compassion. With this, there have been various proposed guidelines for the ethical treatment of human body donors, with most focusing on student reflections and a final ceremony for honoring the donors, but there are numerous other ways throughout the course to incorporate ethical values and to guide students to consider the humanity of the donor. This article proposes that institutions consider the incorporation of five easily implemented formalized ethical themes for working with human body donations into daily practices: (1) reflect the donor as possessing human dignity, (2) recognize the donor's role of the "First Patient" or "Silent Teacher," (3) honor the gift of human body donation, (4) recognize the decedent's family, and (5) consider inclusivity in memorialization practices. Multiple recommendations for integrating these five themes throughout the course are provided. The incorporation of these five core themes can assist in alleviating the psychological stress that some students struggle with in dissection courses, foster the feelings and attributes that comprise the hidden curriculum and are the desired characteristics of a caring medical provider, and discourage misuse and mistreatment of donors.

Whole body donation for teaching in Ghana: The perspectives of medical doctors.

Historically, both donated bodies and unclaimed bodies have been the sources of human bodies for anatomy dissection globally with the latter discouraged for ethical reasons. Ghana lacks well-established body-donation programs, thus relying heavily on unclaimed bodies. Medical doctors benefit foremost from human bodies in their training and therefore should have a better disposition toward body bequeathal. This study assessed the perception, knowledge, and attitude of medical doctors in a Ghanaian institution toward body donation. As the first Ghanaian study on the subject, it provides the foundation for systematic study of the subject in Ghana. An internet-based questionnaire was administered to volunteering medical doctors requesting information on their perception of, knowledge of, and attitude toward whole-body donation. Data were summarized as frequencies. The 200 respondents comprised 1 consultant, 4 specialists, 14 residents, 63 medical officers, and 118 house officers. About 194 (97.0%) were familiar with body donation while 6 (3.0%) were not. Also, 39 (19.5%) were willing to donate their bodies, 98 (49.0%) were unwilling, and 63 (31.5%) undecided. Religion, culture, mishandling of bodies, and lack of awareness were barriers to body donation. Finally, 178 (89.0%) viewed human body dissection as relevant and should remain as part of medical curriculum. Doctors were aware of body donation though only few were willing to donate. Cultural and religious factors were major hindrances to body donation for anatomy education and research, though they were willing to persuade others to participate. Deliberate public education on the subject is required to grow body donation in Ghana.

Effects of Contact Force on Vibrotactile Perceived Intensity Across the Upper Body.

Full-body haptic suits, which can provide tactile sensations across the entire body, have been gaining popularity recently. The tightness of a suit to the user's body determines the contact force between the tactile actuators and the body. The contact force is likely to alter the intended perceptual effects, but relatively little is known about the extent of the alteration. Under this context, we present the effects of contact force on vibrotactile perceived intensity on three body parts: dorsal hand, upper arm, and lower back. To this end, we conducted three perceptual magnitude estimation experiments while controlling vibration amplitude, frequency, and contact force. The results show that increasing the contact force generally made the vibration stimuli feel stronger, while the specific behaviors were dependent on the body part and the experimental variables. Finally, we summarize the major findings and provide guidelines regarding contact force adjustment for effective full-body haptic rendering.

Young Chinese female body skin pigmentation map: A pilot study.

BACKGROUND: Most studies have discussed variations in facial skin colour based on age, gender, and anatomical site within a specific ethnic group. However, skin pigmentation on the body is also a concern for many people. AIM: The aim of this study is to gather baseline data for Chinese young females, conduct a comprehensive assessment of body skin pigmentation, and create a body skin pigmentation map. METHOD: Individual type angle (ITA°) was registered by CL 400 and melanin index (MI) was registered by MX 18 in 100 body points of 20 Chinese females. A total of 12,000 measurements were recorded. RESULT: Our results showed significant differences among the symmetrical points on both sides of the body, including the clavicle, inner wrists, groin, inner ankle, elbow, armpit, waist side, the space between the thumb and index finger, instep, back shoulder, and popliteal space. Of all the points tested on the body, the points with the most severe skin pigmentation were the back of the neck, the heel, the elbow, and the popliteal space. CONCLUSION: This is the first comprehensive study of skin pigmentation conducted on the human body. In young Chinese women, the points with the most severe skin pigmentation were the back of the neck, heels, elbows, and the popliteal space.

An adaptive algorithm for generating 3D point clouds of the human body based on 4D millimeter-wave radar.

The traditional algorithms for generating 3D human point clouds often face challenges in dealing with issues such as phantom targets and target classification caused by electromagnetic multipath effects, resulting in a lack of accuracy in the generated point clouds and requiring manual labeling of the position of the human body. To address these problems, this paper proposes an adaptive method for generating 3D human point clouds based on 4D millimeter-wave radar (Self-Adaptive mPoint, SA-mPoint). This method estimates the rough human point cloud by considering micro-motion and respiration characteristics while combining the echo dynamic with static information. Furthermore, it enhances the density of point cloud generation. It reduces interference from multipath noise through multi-frame dynamic fusion and an adaptive density-based clustering algorithm based on the center points of humans. The effectiveness of the SA-mPoint algorithm is verified through experiments conducted using the TI Millimeter Wave Cascade Imaging Radar Radio Frequency Evaluation Module 77G 4D cascade radar to collect challenging raw data consisting of single-target and multi-target human poses in an open classroom setting. Experimental results demonstrate that the proposed algorithm achieves an average accuracy rate of 97.94% for generating point clouds. Compared to the popular TI-mPoint algorithm, it generates a higher number of point clouds on average (increased by 87.94%), improves the average accuracy rate for generating point clouds (increased by 78.3%), and reduces the running time on average (reduced by 11.41%). This approach exhibits high practicality and promising application prospects.

Opposite size illusions for inverted faces and letters.

Words are the primary means by which we communicate meaning and ideas, while faces provide important social cues. Studying visual illusions involving faces and words can elucidate the hierarchical processing of information as different regions of the brain are specialised for face recognition and word processing. A size illusion has previously been demonstrated for faces, whereby an inverted face is perceived as larger than the same stimulus upright. Here, two experiments replicate the face size illusion, and investigate whether the illusion is also present for individual letters (Experiment 1), and visual words and pseudowords (Experiment 2). Results confirm a robust size Illusion for faces. Letters, words and pseudowords and unfamiliar letters all show a reverse size illusion, as we previously demonstrated for human bodies. Overall, results indicate the illusion occurs in early perceptual stages upstream of semantic processing. Results are consistent with the idea of a general-purpose mechanism that encodes curvilinear shapes found in both scripts and our environment. Word and face perception rely on specialised, independent cognitive processes. The underestimation of the size of upright stimuli is specific to faces. Opposite size illusions may reflect differences in how size information is encoded and represented in stimulus-specialised neural networks, resulting in contrasting perceptual effects. Though words and faces differ visually, there is both symmetry and asymmetry in how the brain 'reads' them.

Investigating effect of standardized total body skin examination using sequence-networks.

This study employs sequence-network analysis to investigate the influence of instructing a standardized procedure on total-body skin examination (TBSE) performance. A between-subjects study was conducted with thirty-one participants comprising medical students and attending physicians. Among these participants, fifteen were randomly assigned to the uninstructed group and sixteen to the instructed group. The participants' gaze and field of view were recorded using eye tracking glasses while performing TBSE on a male and a female standardized patient. The recordings were then transcribed to depict the examination process. The instructed group missed significantly fewer body parts (p = 0.045) and had higher time efficiency (p = 0.007) while examining the female patient, but no significant difference was observed for the male patient examination. Furthermore, the examination sequences of the instructed group contained lesser variability than the uninstructed group. Hence, implementing a standard optimal procedure to perform TBSE could minimize the likelihood of missing body parts, increase examination efficiency, and improve performance consistency. This study demonstrated the potential of sequence-network analysis to study human performance in sequential tasks.

Dental Implant Corrosion Products May Accumulate in the Human Body.

BACKGROUND: Corrosion products resulting from the degradation of the dental implant surface due to biological fluids and infection may accumulate in the body and lead to clinical consequences. PURPOSE: The primary aim of this study is to measure the accumulation of dental implant corrosion products in the human body and the secondary aim is to estimate the association between corrosion products and fatigue. STUDY DESIGN, SETTING, SAMPLE: This study was designed as a prospective cross-sectional and was conducted with patients presenting at to the Department of Oral and Maxillofacial Surgery. The study included patients with Grade IV dental implants made of pure titanium (Ti) at the bone level and Grade V abutments composed of Ti, aluminum (Al), and vanadium (V). Individuals possessing different metallic implants and those prone to metal exposure were not included in the study. Blood and hair samples were procured from each participant and subsequently analyzed. PREDICTOR VARIABLES: The predictor variable is implant exposure, and it was divided into 3 groups; Group I, patients with healthy dental implants; Group II, patients with peri-implantitis; Control Group, individuals without dental implants. MAIN OUTCOME VARIABLES: The primary outcome variables are Al, Ti, V levels in blood and hair samples and the secondary outcome variable is the fatigue questionnaire score. COVARIATES: Age and gender, along with the dental implant number and duration of exposure within the study groups, are utilized as covariates. ANALYSES: Groups were compared using the Kruskal-Wallis and Mann-Whitney U-tests. Spearman's correlation coefficient determined relationships between groups, signifying significance with P values <.05. RESULTS: The sample consisted of 30 patients aged 18 to 68, with 53% being female and 47% male. The differences among the 3 groups in the median values of blood Ti, V; hair Al, Ti, V; and fatigue questionnaire scores were not statistically significant (P > .05). However, the median blood Al value was statistically higher in Group II (P < .05). CONCLUSIONS AND RELEVANCE: While the presence of healthy dental implants may not affect the accumulation of Al, Ti, and V within the body, patients with peri-implantitis exhibited elevated blood Al levels, possibly due to infection influencing the corrosion process.

The legal and ethical framework governing body donation in Europe - 2nd update on current practice.

BACKGROUND: In 2008, members of the TEPARG provided first insights into the legal and ethical framework governing body donation in Europe. In 2012, a first update followed. This paper is now the second update on this topic and tries to extend the available information to many more European countries. METHODS: For this second update, we have asked authors from all European countries to contribute their national perspectives. By this enquiry, we got many contributions compiled in this paper. When we did not get a personal contribution, one of us (EB) searched the internet for relevant information. RESULTS: Perspectives on the legal and ethical framework governing body donation in Europe. CONCLUSIONS: We still see that a clear and rigorous legal framework is still unavailable in several countries. We found national regulations in 18 out of 39 countries; two others have at least federal laws. Several countries accept not only donated bodies but also utilise unclaimed bodies. These findings can guide policymakers in reviewing and updating existing laws and regulations related to body donation and anatomical studies.