title: PoT-PolKA: Let the edge control the proof-of-transit in path-aware networks

authors: Borges, ES

abstract: This paper presents a scalable and efficient solution for secure network design that involves the selection and verification of network paths. The proposal addresses the challenges related to compliance policies by introducing a Proof-of-Transit (PoT) feasible implementation for path-aware programmable networks. Our approach relies on i) a source routing mechanism based on a fixed routeID representing a unique identifier per path, which serves as a key for PoT lookup tables; ii) the “in situ” that allows to collect telemetry information in the packet while the packet traverses a path. The former enables path selection with policy at the edge, while the later allows to perform path verification without extra probe-traffic. A P4 programmable language prototype demonstrates the effectiveness of this approach to protect against deviation attacks with low overhead. The results show its scalability considering the protocol overhead as the path length increases; a significant reduction in network’s forwarding state for fat-tree topologies depending on the workload per path (flows/path). Finally, experimental results show a RTT comparison evaluation, the impact of PoT computation, protection to path deviation and seamless path migration keeping flow protection.

text: PoT-PolKA: Let the edge control the proof-of-transit in path-aware networks This paper presents a scalable and efficient solution for secure network design that involves the selection and verification of network paths. The proposal addresses the challenges related to compliance policies by introducing a Proof-of-Transit (PoT) feasible implementation for path-aware programmable networks. Our approach relies on i) a source routing mechanism based on a fixed routeID representing a unique identifier per path, which serves as a key for PoT lookup tables; ii) the “in situ” that allows to collect telemetry information in the packet while the packet traverses a path. The former enables path selection with policy at the edge, while the later allows to perform path verification without extra probe-traffic. A P4 programmable language prototype demonstrates the effectiveness of this approach to protect against deviation attacks with low overhead. The results show its scalability considering the protocol overhead as the path length increases; a significant reduction in network’s forwarding state for fat-tree topologies depending on the workload per path (flows/path). Finally, experimental results show a RTT comparison evaluation, the impact of PoT computation, protection to path deviation and seamless path migration keeping flow protection.

year: 2024

title: Maturation and biomechanical risk factors associated with anterior cruciate ligament injury: Is there a link? A systematic review

authors: Butcher, Anna J.

subjects: ACL

abstract: Objective: To establish the potential link between sex-specific maturation and biomechanical factors associated with ACL injury during dynamic tasks. Design: Systematic review. Literature search: Five databases (CINHAL®, Cochrane Library, PubMed®, Scopus®, and SPORTDiscus) were searched and monitored until 27 May 2024. Study selection criteria: Cross-sectional, cohort, case-control, or interventional studies reporting one or more biomechanical variable linked with ACL injury and which assessed participants across two or more maturation phases were considered eligible. Data synthesis: Studies were assessed for risk of bias using a modified version of the Newcastle Ottawa Scale and overall quality of evidence was rated using GRADE. Metrics and effect sizes were presented where available. Results: Eighteen included studies examined 400 males, 1377 females, and 315 participants of undefined sex across various maturation phases. The methodological quality of most studies (n = 16) was considered good, and satisfactory for two. Knee abduction angle, knee abduction moment, knee flexion angle, and ground reaction forces were most commonly reported. Knee abduction angles and moments and knee flexion angles were greater in late and post-pubertal females than males and pre-pubertal females during both landing and cutting tasks. When normalised for body mass, ground reaction forces were generally greater in males compared to females overall and for less mature participants for both sexes. Overall quality of evidence was low or medium across the four biomechanical measures. Conclusion: Sex-specific maturation considerations are important in the targeted development and implementation of ACL injury risk identification and prevention strategies.

text: Maturation and biomechanical risk factors associated with anterior cruciate ligament injury: Is there a link? A systematic review Objective: To establish the potential link between sex-specific maturation and biomechanical factors associated with ACL injury during dynamic tasks. Design: Systematic review. Literature search: Five databases (CINHAL®, Cochrane Library, PubMed®, Scopus®, and SPORTDiscus) were searched and monitored until 27 May 2024. Study selection criteria: Cross-sectional, cohort, case-control, or interventional studies reporting one or more biomechanical variable linked with ACL injury and which assessed participants across two or more maturation phases were considered eligible. Data synthesis: Studies were assessed for risk of bias using a modified version of the Newcastle Ottawa Scale and overall quality of evidence was rated using GRADE. Metrics and effect sizes were presented where available. Results: Eighteen included studies examined 400 males, 1377 females, and 315 participants of undefined sex across various maturation phases. The methodological quality of most studies (n = 16) was considered good, and satisfactory for two. Knee abduction angle, knee abduction moment, knee flexion angle, and ground reaction forces were most commonly reported. Knee abduction angles and moments and knee flexion angles were greater in late and post-pubertal females than males and pre-pubertal females during both landing and cutting tasks. When normalised for body mass, ground reaction forces were generally greater in males compared to females overall and for less mature participants for both sexes. Overall quality of evidence was low or medium across the four biomechanical measures. Conclusion: Sex-specific maturation considerations are important in the targeted development and implementation of ACL injury risk identification and prevention strategies.

year: 2024

title: ‘Inside Out’: The politics of enumerating the nation by ethnicity

authors: Kukutai, Tahu

abstract: Since the 1990s, state practices of counting and classifying populations by ethnicity have come under increased scrutiny within the social sciences (Arel 2002 ; Kertzer and Arel 2002 ; Nobles 2000 ; Perlmann and Waters 2002 ; Petersen 1997 ; Statistics Canada and U.S. Census Bureau 1993 ). A number of excellent case studies have provided critical insights into how and why ethnic enumeration is pursued in particular times and places. ¹ However, with some notable exceptions (Morning 2008 ; Rallu
et al. 2006 ), little attention has been given to theorizing or empirically testing a global
model of ethnic classifi cation and counting. Consequently, there is a limited understanding
about the general conditions that impede or encourage state recognition of ethnicity in the national census and the forms that such recognition takes.

text: ‘Inside Out’: The politics of enumerating the nation by ethnicity Since the 1990s, state practices of counting and classifying populations by ethnicity have come under increased scrutiny within the social sciences (Arel 2002 ; Kertzer and Arel 2002 ; Nobles 2000 ; Perlmann and Waters 2002 ; Petersen 1997 ; Statistics Canada and U.S. Census Bureau 1993 ). A number of excellent case studies have provided critical insights into how and why ethnic enumeration is pursued in particular times and places. ¹ However, with some notable exceptions (Morning 2008 ; Rallu
et al. 2006 ), little attention has been given to theorizing or empirically testing a global
model of ethnic classifi cation and counting. Consequently, there is a limited understanding
about the general conditions that impede or encourage state recognition of ethnicity in the national census and the forms that such recognition takes.

year: 2015