Repair of both simple and complex defects in the distal lower leg continues to be a challenging task for reconstructive surgeons because of the local paucity of soft tissue available for transfer. The popular neurocutaneous flap, introduced by Masquelet et al in 1992, has provided a reliable and less technically demanding method for resurfacing defects of the lower leg. We herein present our experience with the versatile design of the distally based saphenous neurocutaneous perforator f lap to provide coverage of complex posttraumatic lower leg defects by harvesting multiple tissue compo-nents in various combinations. Our series comprised 14 patients (11 men, 3 women; average age, 40.4 years; range, 22-58 years) who underwent an average follow-up period of 19.2 months (range, 9-25 months) (Table 1). The distal pivot point was kept at 5 to 7cm above the tip of the medial malleolus, pre-serving the distal-most perforator, and 4 flaps were taken with massive sub-cutaneous tissue to obliterate the dead space. The procedure was uneventful in 13 patients. Slight venous con-gestion was noted in 1 patient, and secondary healing was achieved by con-servative treatment. The distally based saphenous neurocutaneous perforator flap is an excellent alternative for skin resurfacing of the distal lower leg, with sat-isfactory functional and aesthetic outcomes.

We investigate heat conduction in a one-dimensional chain of rigid rotors. The rotors are constrained to rotate in a plane about fixed pivot points and coupled by springs, such that in equilibrium, the neighboring rotors lie on opposite sides of the chain axis. The linearized limit of this model valid for small angular displacements was first introduced by Kane and Lubensky (KL) [Nat. Phys. 10, 39 (2014)1745-247310.1038/nphys2835] as a topological mechanical insulator hosting zero-energy vibrational edge modes. We show that the linearized KL chain behaves as a thermal insulator at low temperature in both the topological phases with a finite band gap, and the heat current falls exponentially with the chain length. When the gap vanishes at the topological phase transition, the KL chain becomes a good thermal conductor and conducts heat ballistically. The chain of rotors for arbitrary angular displacements hosts nonlinear solitary waves and distinct topological mechanical phases. Our numerical analysis shows normal (diffusive) heat conduction in all topological phases of the nonlinear chain. Nevertheless, a finite thermal conductivity is achieved for different system sizes in different topological phases of this nonlinear chain.

The integration of artificial intelligence (AI) into clinical medicine presents a persistent paradox: diagnostic models routinely demonstrate benchmark superiority over human experts, yet bedside adoption remains fragile, and clinician trust is low. Conventional forecasting approaches-projecting model performance along optimistic trend lines-are epistemologically insufficient because they cannot account for the nonlinear sociotechnical transitions that separate technical capability from institutional trust. This Viewpoint applies backcasting, a normative futures methodology with a 4-decade evidence base in energy policy and public governance, to the specific challenge of clinician adoption of AI diagnostics, with the aim of identifying the structural interventions required to achieve durable trust by 2040. Consistent with the tradition of single-expert normative foresight analysis, we applied backcasting as a structured reasoning framework using a STEEP (social, technological, economic, environmental, and political) analysis. Sources from PubMed, IEEE Xplore, Google Scholar, and policy repositories (the US Food and Drug Administration, World Health Organization, Organisation for Economic Co-Operation and Development, and European Commission) published between 2010 and 2025 were reviewed; barriers and enablers were coded across STEEP dimensions to identify pivot points representing convergent, time-bound structural changes. Working backward from a defined 2040 vision state-a health care ecosystem with risk-stratified clinician trust thresholds, semantic transparency of AI outputs, integrated AI governance, and futures literacy in medical education-we identified three temporal pivot points: (1) the 2030 standardization of dual-process AI architectures, in which large language models are verified in real time by locally deployed small language models, producing a calibrated confidence score; (2) the 2035 institutionalization of agentic AI orchestration governed by a formally designated chief AI officer; and (3) the 2040 integration of futures literacy and human-AI teaming competencies into standard medical curricula. The AI trust gap is an institutional design problem, not a technical inevitability. Backcasting reframes the central question from "when will AI be ready for medicine?" to "what must we build to make medicine ready for AI?" The 3 pivot points identified here-verifiable AI by 2030, agentic governance by 2035, and futures literacy by 2040-are structural commitments that clinicians, health system leaders, and policymakers can begin building today.

The Reverse Sural Artery Flap (RSAF) supplied by distal peroneal perforators is a versatile local flap option for distal limb coverage. We describe perforator distribution in cadaveric dissections, and our clinical experience with four novel modifications (perforator skeletonization, Achilles tendon release, tunneling under the Achilles tendon, proximal peroneal artery ligation) to allow greater reach for the RSAF. 38 cadaveric legs were dissected to study the peroneal perforators. 12 patients from 5-73 years-old underwent RSAF and the proposed modifications for a variety of defects, including the medial foot and distal forefoot. From the cadaveric study, terminal peroneal perforator was at a mean distance of 10.96±3.67 cm above the malleolus. Only 10.6% of distal-most perforators were within the last 20% of the fibular length, or 6.76 cm from the malleolus. Clinical series findings were comparable, with adult distances of 9.31±1.80 cm. However, the pivot point was lower, at 6.67±1.59 cm, owing to perforator skeletonization and dissection off the Achilles in all cases, tunneling under the Achilles in four, and proximal peroneal artery ligation in one. Two had subsequent <10% distal tip necrosis and one 50% superficial epidermolysis, which healed with local care. The terminal peroneal perforator may lie higher than the 5 cm pivot point generally recommended for the RSAF. For these cases, perforator skeletonization, dissection off and/or tunneling under the Achilles tendon, and even proximal peroneal artery ligation can allow further reach of the RSAF to reliably cover distal defects including the medial foot and forefoot.

The nonlinear problem of controlling the attitude of a suspended cargo during transportation and various flight phases of an aerial vehicle is considered. The control system requirement is to provide independent cargo attitude control relative to the aerial vehicle. The suspension is done by a cable and a pair of spherical joints on both sides, resulting in a system containing two oscillations of the cable and a two-dimensional rotation of cargo, simplified as a double spherical pendulum model. The technical solution is obtained by a reaction wheel system installed in the cargo and an Omni wrist at the pivot point. Different stages of flight, agile movement of the drone, and highly perturbed environments require a robust control capable of being adjusted rapidly to new operating conditions. Attitude control algorithms are synthesized based on the newly developed optimized integral sliding mode, and the sufficient conditions of reachability and convergence for the nonlinear case are derived. The efficiency of the algorithm is confirmed by the results of numerical simulation.

Solastalgia: Conflict and the Fabric of Life was a transdisciplinary project, engaging academics and artists from the fields of law and arts (dance, visual arts, photography and painting). The project evolved over five years, utilising a variety of research activities and methods of investigation, with embodied experience at the heart of the research. As the research progressed, the pivot point became the investigation of the concept of solastalgia – the civilian experience of pain and distress caused by destruction of home and home environments. This research project grew from our curiosity concerning how embodied investigation of international humanitarian law might inform our understanding of civilian experiences in armed conflict, particularly considering the legal principles of distinction and proportionality. Drawing from the perspectives of the academic disciplines involved, this article outlines the evolution of the project. It documents and expresses the transdisciplinary methods the researchers and artists engaged with.

Background/Objectives: During adult walking, ground reaction forces (GRFs) consistently intersect near a point above the center of mass (CoM), termed the virtual pivot point (VPP). The VPP is hypothesized to contribute to upper body stabilization. However, little is known about its presence and developmental trajectory during early childhood. This study investigated age-related differences in VPP position, variability, and GRF focusing during walking in typically developing children. Methods: Kinematic and kinetic data were collected from 29 children across three age groups: Group I (aged 1 year), Group II (aged 2-3 years), and Group III (aged 10-15 years) using markerless motion capture and force plates. VPP position relative to the CoM, its variability and GRF focusing (R2) were analyzed in sagittal plane during single support phases. Results: Across all age groups, GRFs were strongly focused toward a VPP (R2 > 0.95), with no significant age-related differences in GRF focusing. In contrast, significant age-related differences emerged in VPP position and variability. The normalized vertical VPP position increased progressively from Group I (7.58 cm) to Group III (14.79 cm). Notably, in several toddlers, the VPP was located at or below the CoM, contrasting with the consistent above-CoM position observed in adolescents. Conclusions: These findings demonstrate that while GRF focusing behavior is present in toddlers who can walk independently, VPP characteristics undergo substantial developmental changes. The shifting VPP position and the decrease in variability in toddlers likely reflect progressive changes in gait mechanics and trunk stabilization strategies during childhood.

Origami techniques originate from the ancient paper-folding traditions of China and Japan. Since the mid-20th century, origami engineering has developed into an independent technology, transforming concepts of foldable and deployable structures in aerospace. More recently, new application areas have emerged, including the design of robots, biomedical devices, antennas, shock absorbers, and metamaterials. This study highlights a range of novel aspects of a twist that underlies both the folding of two-dimensional flat-foldable units and their periodic tilings, as well as three-dimensional structures, where it manifests as an internal, chiral movement enabling the transition between flat-folded and deployed configurations. The principle of twist was first explicitly identified by Pooya Sareh in crystallographic origami tessellations derived from the Miura-ori and is referred to here as the “Sareh twist.” Building on this concept, the present study extends the role of twist to four domains: degree-4 vertex units in single and docked tiles; conic transformations with the vertex as a pivot point; the twist-inducing diagonal fold in rectangles, which was crucial for defining industrial paper format ratios by Wilhelm Ostwald around 1911 and is adapted here to parallelograms; and finally, the internal twist of the cylindrical Kresling pattern developed by the author. The key innovation of this work is the development of a general approach that transforms even the most complex geometries into Sareh twist units defined by their specific symmetries. This approach not only advances the rational design of folded structures but also enhances our understanding of biological patterns.

Biological machines use targeted deformations that can be actuated by Brownian fluctuations. However, although synthetic micromachines can similarly make use of targeted deformations, they are too stiff to be driven by thermal fluctuations and require strong forcing1-3. Furthermore, systems that are able to change their conformation by thermal fluctuations do so uncontrollably4,5 or require external control6. Here we use DNA-based sliding contacts7-9 to create colloidal pivots, rigid anisotropic objects that freely fluctuate around their pivot point and use a hierarchical strategy to assemble these into Brownian metamaterials with targeted deformation modes. We realize the archetypical rotating diamond and rotating triangle, or kagome, geometries and quantitatively show how thermal fluctuations drive their predicted auxetic deformations10-15. Finally, we implement magnetic particles into the colloidal pivots to achieve colloidal metamaterials that can be controlled externally as well as use Brownian fluctuations for precisely controlled shape changes. Together, our work introduces a strategy for creating Brownian mechanical metamaterials with easily actuatable deformation modes.

Abstract Minimally invasive surgery procedures involve the handling of a camera system called the endoscope. Nowadays, endoscopes with rigid telescopes are sometimes handled by an assistive robot system for operating the endoscope about a pivot point. The design of the endoscope holder to be assembled on a readily available robot arm presents new challenges when this assistive robot system works alongside the surgeon. This study addresses these challenges and proposes an optimal design procedure for the endoscope holder to be attached to a readily available robot arm. The proposed design procedure aims to improve the motion control quality about the pivot point while minimizing the positional uncertainty for maintaining the pivot point location. The constructional design of the endoscope holder is presented alongside the assessments on the manufactured prototype.

To identify the continuous dose-response relationship between the duration of premature rupture of membranes (PROM) and the probability of neonatal and maternal infectious morbidity. This meta-analysis and systematic review synthesise data from 15 studies worldwide involving more than 70,000 mother-neonate pairs. A two-step random-effects model of PROM duration as a continuous dose, using restricted cubic splines, was used to estimate specific risk thresholds. The analysis established a progressive, non-linear escalation of risk. The onset of statistical risks at 16 hours is the early-onset pneumonia (Adjusted OR 1.86, 95% CI: 1.152.99). At the age of 18 hours, the incidence of culture-proven sepsis in neonates was 4.0%, and the odds ratio for maternal fever was significantly higher (AOR 36.6). The analysis of the ROC curves revealed a critical mathematical pivot point at 37 hours, after which complications escalate exponentially. Latency greater than 48 hours was the most significant independent predictor of culture-proven sepsis, with an increased risk of 8.2 (p < 0.001). Histologic chorioamnionitis was detected in 39% of mothers, and in many cases, they are clinically silent. Considerable heterogeneity (I2 > 60%) was mainly caused by gestational age disparities in cohorts of extremely preterm and term babies. PROM latency risk is not a threat but accelerates with time. Although 18 hours will be an acceptable early warning level, the range of 37 to 48 hours is a high-risk period that needs aggressive treatment. International guidelines need to be reviewed to reflect this non-linear trend, especially regarding pregnancy, where the risks of delivery are low compared to the rising risk of latency.

Abstract This study focuses on developing a dynamic model of the rider–folding bicycle system equipped with a rear suspension, based on the geometric parameters of the commercial Fornix F160 bicycle and pivot point locations referenced from the work of Good and McPhee. The equations of motion, derived from the second kind of Lagrange equations, are numerically solved using the Runge–Kutta method to determine the rider’s acceleration response, which serves as a key indicator for evaluating ride comfort. The reliability of the dynamic model is validated by comparing its results with simulations conducted in Altair Inspire software. Following model validation, the defined dynamic model is employed to quantify rider comfort through vertical acceleration responses, in accordance with the ISO 2631 standard. The analysis is conducted under two excitation conditions: irregular road surfaces defined by ISO 8608 and cluster-type speed bumps specified in TCCS 34:2020. Based on this setup, the study investigates the influence of rear suspension parameters ( c; k ), aiming to identify the optimal configuration that enhances rider comfort. The results demonstrate that the proposed model significantly improves ride comfort, with enhancements of up to 88.57% compared to a rigid-frame bicycle. These findings have informed notable structural modifications to the frame design relative to the original folding bicycle configuration.

Bacterial lipoproteins are key structural components of the outer membrane in Gram-negative bacteria and vital components of machineries required for its biosynthesis and maintenance. The Lol system, essential for viability, directs transport of lipoproteins from the site of biosynthesis on the inner membrane to the outer membrane and has been the target of extensive efforts to develop novel antimicrobial drugs. In the first stage of this transport process, newly synthesized lipoproteins are released from the inner membrane by the ABC transporter LolCDE and passed to the periplasmic chaperone, LolA. Here, we show cryo-EM structures of LolCDE in complex with three different lipoprotein substrates, Lpp, Pal, and LolB, with the latter two bearing a disordered peptide linker between the acyl chains and the globular domain. Our work reveals that when the mature lipoprotein lacks an unstructured linker, the N-terminal portion of the protein is in an unfolded state for transport. The lipoproteins make a sequence-independent but structurally conserved interaction with a cleft on the surface of the periplasmic domain of LolE that promotes efficient transport. We propose a model of lipoprotein export where this interaction acts as pivot point for the peptide portion of the lipoprotein allowing the acyl chains to rotate 180° from their initial position in LolCDE to their binding site in LolA. Our results demonstrate how LolCDE can extrude lipoproteins of diverse sequence and structure and reveal an important detail of a transport process fundamental to bacterial physiology.

To address the pronounced issue of noise and vibration within the combine harvester cab, this study proposes a hybrid simulation and experimental validation approach that integrates the pivot noise transfer function (NTF) with a finite element method (FEM)-based vibroacoustic coupling analysis. A coupled finite element model combining the cab structure and its internal acoustic cavity was developed, with the excitation path characteristics explicitly defined. The coupled interaction between structural and acoustic modes, along with its influence on noise transmission, was systematically examined. The analysis revealed a significant transmission peak near 18 Hz at critical pivot Point D under specific excitation directions, indicating strong directional sensitivity in the excitation–response relationship. Experimental validation showed that the discrepancy between simulated and measured responses, including the NTFs, remained within 15%, confirming the accuracy and applicability of the proposed method. This research offers a reliable analytical framework and practical reference for noise and vibration reduction in agricultural machinery cab design.

Peripheral neuropathy (PN) is a prevalent neurological disorder, affecting 26–39.2% of adults aged 65 and older due to peripheral nerve degeneration and associated conditions like diabetes. PN leads to sensory impairments, including diminished tactile sensation, increased fall risk, and mobility issues. Tai Chi (TC) is a low-impact exercise shown to enhance sensory function and balance in healthy older adults, but its effects on PN patients remain unclear. Brisk walking (BW) is a widely recommended exercise for older adults, yet its impact on sensory function in PN is not well-established. This study compares TC and BW interventions on tactile sensation in older adults with PN. A randomized controlled trial was conducted with 40 older adults (≥65 years) diagnosed with PN, randomly assigned to TC or BW groups. Both groups participated in supervised sessions, three times per week for eight weeks, including a 5-minute warm-up, 40-minute exercise, 10-minute rest, and 5-minute cool-down. Tactile sensation was assessed using the Semmes-Weinstein Monofilament at five-foot locations. Data were analyzed using a two-way repeated measures ANOVA, with post hoc tests applied when significant interactions (p &lt; 0.05) were detected. Significant interactionwere observed at the heel (p = 0.044, η ² p = 0.137) and the fifth metatarsal head (p = 0.034, η ² p = 0.151), with the TC group showing greater reductions in tactile sensation thresholds at week 9 (heel: p &lt; 0.001, d = 1.32; fifth metatarsal: p &lt; 0.001, d = 1.4) than BW (p &gt; 0.05; p = 0.025, d = 0.78). TC demonstrated greater improvements in tactile sensation among PN compared to BW. This effect may be attributed to TC’s unique movement structure, which includes multiple rotational movements using the heel as a pivot point, increasing heel stimulation, and potentially enhancing tactile sensation. Additionally, TC incorporates lateral movements that engage mechanoreceptors on the lateral aspect of the foot, which are less frequently activated in other forms of exercise. This targeted activation may contribute to improved cutaneous sensitivity in the lateral foot region.

This study investigates the influence of the Strouhal number on the thrust and propulsive efficiency of two-dimensional tandem elliptical flapping airfoils through numerical simulations validated by in-house experiments at a Reynolds number of 5000. The front and rear airfoils, identical in shape and size, are aligned with the freestream, with the rear airfoil positioned one chord length behind the front. The Strouhal number was varied from 0.2 to 0.7, while the geometric effective angle of attack amplitudes at the pivot points were set to 10, 15, and 20 degrees. Results show that the rear airfoil has minimal effect on the time-averaged thrust of the front airfoil, but the wake of the front airfoil strongly influences the flow field and thrust of the rear one. The thrust produced by the rear airfoil increases with the Strouhal number up to a critical value of 0.4, then decreases, with larger angles of attack producing higher thrust. The growth of the leading-edge vortex on the rear airfoil is controlled by the residual vortex beneath the front airfoil and the shear layer shed from the upper surface of the front airfoil. The residual vortex enhances the local flow angle and increases thrust, while the shear layer intermittently reduces it. When the shear layer passes over the rear airfoil, the local flow angle rises sharply, leading to rapid vortex growth and greater thrust, particularly at a 15-degree angle of attack. These results demonstrate the aerodynamic advantages of tandem flapping configurations under optimized unsteady flow interactions.

Anthropometric analysis of the nasal bone can establish parameters that significantly contribute to rhinoplasty outcomes. Key anatomical landmarks situated along the nasal dorsum, including the sellion, rhinion, and kyphion, can have significant angular relationships. Among these elements, the dorsal profile angle (DPA) and its corresponding point have been the least investigated to date. A comprehensive review of nasal bone anthropometrics using three-dimensional computed tomography (3D-CT) images from 1022 randomly selected adult Turkish patients who applied for rhinoplasty at our clinic between 2022 and 2025years was conducted. The inclusion criteria for this study consisted of cases seeking primary rhinoplasty; cases of secondary rhinoplasty and severe trauma were excluded from consideration. The measurements were meticulously performed on lateral views of the CT scans. Key points identified included the nasion, sellion, dorsal profile angle (hereinafter referred to as the gibbion point), kyphion, and rhinion points. The dorsal profile angle, nasofrontal angle (NFA), nasion angle (NA), and kyphion angle (KA) were calculated, along with measurements of nasal bone length and shape. Thus, S- and V-shape nasal bone anthropometrics were detected, and the correlations between all measurements were evaluated. The mean age was 35.4 ± 12.7years. Of the cases, 501 were female, and the remaining were male. Seven hundred sixteen cases had an S-shaped nasal bone. In contrast, 306 had a V-shape. The DPA, NFA, and KA were 153.5 ± 10.7°, 125.7 ± 7.1°, and 160.7 ± 6.5° in the S-shape group, while they measured 157.5 ± 7.3°, 128.5 ± 10.6°, and 167 ± 7.3° in the V-shape group, respectively. There was a statistically significant difference between the measurements (p = 0.001). A low-level but positive correlation was found between the DPA with kyphion and nasofrontal angles. The pivot point of the dorsal profile angle represents the origin of a prominent hump. This angle is more distinct in males and noses characterized by S-shaped nasal bones. Therefore, surgeons are advised to consider DPA when executing preservation rhinoplasty, as alterations to this angle may transform the nasal framework from an S-shape to a V-shape. This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .

Location point set similarity range query aims to retrieve candidate point sets that are similar to the given point set in terms of location distribution patterns and geographical features, and it is vital in GIS (Geographic Information Systems), IoT (Internet of Things), and biometrics. Due to the economic and flexible advantages of cloud services, location data is frequently outsourced to cloud servers, which simultaneously increases the risk of privacy breaches. To address this, service providers choose to encrypt data before outsourcing. However, the existing schemes for similarity range query of encrypted location point sets have some problems, such as high computational complexity of measurements, which limit the query efficiency and security of schemes. To tackle these problems, this paper achieves the efficient and privacy-preserving location-point-set similarity range query for cloud computing (LPSQ). Firstly, we propose a lightweight similarity measurement called Geo-Jaccard similarity, to reduce the time complexity to <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$O(n)$</tex-math></inline-formula>. Secondly, to enhance the efficiency of the scheme, we integrate the kd-tree with pivot point technology to construct a pkd-tree, and design a corresponding filtering and verification algorithm. Thirdly, to enhance the security of our scheme, we encrypt the pkd-tree using a mix of matrix encryption and SHE (Symmetric Homomorphic Encryption), and design a series of protocols under SHE, such as SHE batch minimum value calculation protocol, SHE division protocol, and the approximation algorithm for computing Jaccard similarity securely. Finally, we prove that the security of our proposed LPSQ achieves CPA (Chosen Plaintext Attack) security. Furthermore, we conduct experiments to assess the performance, and the results demonstrate that LPSQ achieves sublinear search efficiency, while Geo-Jaccard similarity proves effective for similarity range queries on location point sets.

Range of Motion (ROM) assessment is a critical baseline metric for diagnosis, treatment monitoring, and rehabilitation goal setting. It significantly impacts patient well-being, aligning with Sustainable Development Goal 3 (SDG 3). However, the universal goniometer (UG), presents limitations regarding accuracy and practical efficiency in clinical settings. Therefore, this study aimed to determine the concurrent validity of an electronic goniometer named Goniwear compared to the UG for measuring elbow and knee angles. The validity of Goniwear involved 40 healthy volunteers stratified by age (20-39 and 40-59 years) and sex. Simultaneous active and passive ROM measurements were conducted three times using both UG and on flexion and extension of the elbow and knee joints. Data were analyzed using the intraclass correlation coefficients (ICC), which were calculated using a two-way random-effects model, and the Bland-Altman method was used to determine the limits of agreement (LoA) between the UG and Goniwear. Reliability between the two instruments ranged from poor to excellent, depending on the joint and movement type. Elbow flexion and extension demonstrated consistently good to excellent reliability in both active and passive conditions (ICC = 0.84-0.91), with minimal bias and relatively narrow LoA. Knee flexion and extension showed poor to moderate reliability (ICC = 0.44-0.55), particularly for extension, accompanied by a wide LoA. Agreement between the UG and Goniwear varies across joints and movement conditions. While the instruments appear interchangeable for elbow movements, caution is warranted when interpreting knee ROM due to greater measurement variability. The Goniwear demonstrates high validity for single-axis joints with fixed pivot points, suggesting strong potential for clinical application in specific contexts. The Thai Clinical Trials Registry is TCTR20251120001.

Purpose This study explores how service sector employees perceive, appraise, and cope with the disruptive impacts of organizational AI adoption—an aspect often overshadowed in literature by strategic and technical concerns. Design/methodology/approach The study proposes an eight-stage process model based on the transactional theory of stress and coping and the conservation of resources theory. It introduces a novel nested 2 × 2 coping typology that categorizes 16 distinct strategies (reactive, preventive, anticipatory, and proactive, further differentiated by active/passive and constructive/destructive dimensions) and defines an appraisal pivot point (APP) as a critical juncture for strategy reassessment. Findings The findings indicate that employees' responses to organizational AI adoption are strongly influenced by personal and managerial resources. Diverse evaluations of AI-induced stressors trigger evolving coping strategies, with the APP marking a decisive moment where adjustments lead to 16 unique coping responses. Research limitations/implications As a conceptual model, its propositions require empirical validation. Future research should test the model across varied industries and cultural settings using longitudinal designs and develop reliable measurement scales for constructs like the APP. Practical implications The study provides actionable insights for service organizations, guiding the design of targeted HR interventions and leadership strategies. Emphasizing resource replenishment through training, support, and feedback, the model assists in shifting employee behaviors from destructive to constructive coping during AI transitions. Originality/value The current study contributes to the service literature by proposing a holistic framework that integrates temporal, individual, and organizational dimensions into understanding employees' perspectives amid AI-driven workplace transformations, thereby bridging a critical gap in current research and offering fresh research directions and practical insights for managing change.