Osteoarthritis (OA) of the knee is a common condition. The condition causes pain and swelling in the knee joint and as a consequence knee range of motion, particularly knee extension, can be decreased. While a number of studies have indicated increases in knee extension range of motion (ROM) can be achieved following stretching interventions, these studies have been undertaken in young healthy populations mostly. To date, there have been no investigations of stretching as a single intervention in people with OA knee. Review of Literature: To gain an appreciation of the literature in this area, three structured literature reviews were undertaken. The first examined the efficacy of acute stretching interventions on lower limb joint ROM in young and elderly subjects, the second examined the efficacy of periodic muscle stretching interventions on lower limb joint ROM in elderly subjects and the third examined the efficacy of periodic muscle stretching interventions on ROM in subjects with OA of the knee joint. The results of the first review indicated that there is strong evidence for acute stretching interventions to increase joint ROM in the lower limb of young and elderly subjects. The results of the second review indicated that there is strong evidence for periodic stretching interventions to increase joint ROM in the lower limb of elderly subjects. The result of the third review indicated that there is limited evidence for stretching interventions alone to improve ROM in the lower limb in subjects with OA of the knee joint. As consequence of these findings two studies were designed to investigate the effects of acute and periodic stretching in people with OA of the knee joint. Study 1 Objective: The objective of this study was to investigate the effects of an acute hamstring-stretching programme on knee extension range of motion in individuals with osteoarthritis (OA) of the knee and compare them to individuals of a similar age without OA of the knee. Study Design: A cross sectional study design was used. Participants: Thirty one subjects (16 male and 15 female) with OA of the knee were recruited from the local population (mean age 67.8 yrs SD: 5.0, mass 81.4 kg, SD: 15.2, height 168.5 cm, SD 11.1). Thirty one subjects of a similar age (9 male and 23 female) were also recruited who were otherwise fit and healthy and did not have OA of the knee (mean age 68.8 yrs SD: 5.2, mass 71.4 kg, SD: 13.2, height 163.8 cm, SD 8.1). Method: Hamstring extensibility was assessed by a passive knee extension test using a Kincom® isokinetic dynamometer. Subjects undertook two trials of maximum knee extension. The Kincom® then stretched the hamstrings to a point determined as 80% of the initial maximum knee extension test. Three sets of 60 seconds stretching were undertaken with 60 seconds rest between sets. Two further maximal knee extension tests were performed after the stretching intervention. The variables of interests were maximal knee extension, peak passive torque and stiffness. Analysis: A 2-factor repeated measures ANOVA model was utilised. The alpha level was set at 0.05. Results: There was a significant main effect by time for knee extension ROM, peak passive torque and stiffness (p<0.05). There was no interaction effect between groups across time (p>0.05). Knee extension range of motion (ROM) in the OA group increased significantly from 75.6 (SD: 17.2) degrees to 80.5 (SD: 22.3) degrees after the intervention (p<0.05). Subjects in the non OA group increased significantly from 77.5 (SD: 15.5) degrees to 81.9 (SD: 18.2) degrees after the intervention (p<0.05). The knee extension ROM recorded at 50% of the peak torque level pre intervention for the OA group was 60.3 (SD: 18.7) degrees and this increased significantly to 67.2 (SD 16.7) degrees post intervention (p<0.05). For the non OA group, knee extension ROM at 50% of peak torque increased significantly from 60.1 (SD: 15.2) degrees to 65.8 (SD 16.0) degrees (p<0.05). Peak passive torque in the OA group increased significantly from 18.1 (SD: 9.6) Nm to 22.5 (SD: 12.9) Nm after the intervention (p<0.05). Subjects in the non OA group increased significantly from 21.05 (SD: 11.6) Nm to 22.05 (SD: 12.8) Nm after the intervention (p<0.05). For stiffness, there was a significant interaction effect (p <0.05) between groups across time. The OA group increased significantly from 0.70 (SD: 0.35) Nm/deg to 0.89 (SD: 0.5) Nm/deg after the intervention (p<0.05). Subjects in the non OA group increased significantly 0.78 (SD: 0.36) Nm/deg to 0.82 (SD: 0.42) Nm/deg after the intervention (p<0.05). Conclusions: The study demonstrated that knee extension ROM, passive resistive torque and stiffness increased with a single bout of stretching. These results indicate that both elderly subjects and those with degenerative joint disease are able to demonstrate immediate tissue adaptations with acute stretching interventions. This is important as clinicians often prescribe acute stretching exercises in the preparation for other activities such as strengthening and walking programmes. Improving joint range of motion prior to other subsequent activities may be beneficial to those people with OA in particular, as management guidelines for these populations recommend regular exercise to reduce the deterioration of the condition. Study 2 Objective: The purpose of this study was to investigate the effects of a six week stretching intervention to the key muscles of the lower limb, in people with osteoarthritis (OA) of the knee joint and compare them to individuals of a similar age without OA of the knee. A 12 week follow up was undertaken to see if these effects were maintained following the intervention. This study builds on the effects of an acute stretching intervention as demonstrated in Study 1. Study Design: A randomised control trial design was used. Participants: Forty three subjects (24 OA and 19 non OA) were recruited from the local population (mean age 68.8 yrs SD: 5.0, mass 79.5 kg, SD: 14.6, height 166 cm, SD 9.8). Subjects were randomly allocated by condition to either a stretch group or a control group. Methods: Hamstring extensibility was assessed by a passive knee extension test using a Kincom® isokinetic dynamometer at baseline, following the intervention and at a 12 week follow-up. Subjects in the intervention groups stretched the main lower limb muscles 3 x 60 seconds, 5 days a week for 6 weeks. The control groups did not stretch but received a placebo intervention of interferential current. The variables of interest were maximal knee extension, peak passive torque and stiffness. The following outcome measures were also used to assess activity levels: the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), the Lower Limb Task Questionnaire (LLTQ) and the Aggregated Locomotor Functional (ALF) score. Analysis: A 3-factor (group x condition x time) repeated measures ANOVA model was utilised. The alpha level was set at 0.05. Results: There was a significant main effect for time and a significant interaction effect for group (stretch and control) by time for knee extension ROM, peak passive torque and stiffness (p<0.05). There was no significant interaction for condition (OA vs non OA) (p>0.05). Subjects in the stretch group had 68.9 (SD: 15.5) degrees of knee extension before the intervention and this increased significantly to 76.8 (SD: 14.4) degrees after the intervention (p<0.05). At the 12 week follow up assessment, subjects had a mean of 72.5 (SD: 20.51) degrees. This difference was not significant when compared to the post intervention assessment (p>0.05). Subjects in the control group were not significantly different for knee extension ROM following the intervention or at the 12 week follow up (p>0.05). For the knee extension ROM at 50% of the maximum torque level, there was a significant main effect for time (p<0.05) but no significant interaction effect between groups across time (p >0.05). The mean knee extension ROM recorded at 50% of the peak torque level for the stretch group pre intervention was 55.9 (SD: 15.0) degrees and this decreased significantly to 50.8 (SD 12.3) degrees post intervention (p<0.05). The mean knee extension ROM recorded at 50% of the peak torque level pre intervention for the control group was 60.2 (SD: 11.4) degrees and this decreased significantly to 57.1 (SD 11.0) degrees post intervention (p<0.05). With respect to peak passive torque subjects in the stretch group were 13.2 (SD: 7.7) Nm before the intervention and increased significantly to 19.7 (SD: 9.5) Nm after the intervention (p<0.05). At the 12 week follow up assessment, the subjects in the stretch group generated a mean peak torque of 20.2 (SD: 11.5) Nm. This difference was not significant when compared to the post intervention assessment (p>0.05). With respect to stiffness, subjects in the stretch group were 0.62 (SD: 0.3) Nm/deg before the intervention and this increased significantly to 0.84 (SD: 0.3) Nm/deg after the intervention (p<0.05). At the 12 week follow up time point, the subjects in the stretch group had a mean stiffness of 0.88 (SD: 11.5) Nm/deg. This increase was not significant when compared to the post intervention assessment (p>0.05). Subjects in the control group were not significantly different for peak passive torque or stiffness following the intervention or at the 12 week follow up. There was no significant difference for time or condition for the WOMAC or LLTQ scores. There was a significant main effect for time for both groups for the ALF score (p<0.05), however there was no significant interaction for time by condition (p>0.05). Subjects in the stretch group had a mean ALF score of 23.1 (SD: 3.9) seconds pre intervention and this reduced significantly to 19.8 (SD: 5.4) seconds post intervention (p<0.05). Subjects in the control group had a mean AFL score of 24.8 (SD: 3.1) seconds pre intervention and this reduced significantly to 22.3 (SD: 3.0) seconds post intervention (p<0.05). Conclusions: The study demonstrated that knee extension range of motion, peak passive torque and stiffness increased in those subjects who undertook the six week stretching programme. Knee extension ROM was not maintained at the 12 week follow up assessment, however peak passive torque and stiffness were. These results indicate that both elderly subjects and those with degenerative joint disease are able to demonstrate long term adaptations with periodic stretching interventions. Functional improvements were also observed following the intervention in the stretch groups and the control groups. As previous studies investigating exercise interventions in subjects with OA of the knee joint have combined stretching and strengthening exercises, this study has provided a clear picture of the effects of stretching alone in this population. However, to gain a more obvious change in function in subjects with OA of the knee joint, the combination of stretching with other exercises such as strengthening, may be required in future studies.

In most robot applications, the control of the manipulators end-effector along a specified desired trajectory is the main concern. In these applications, the end-effector (tip) of the manipulator is required to follow a given trajectory. Several methods have been so far proposed for the motion control of robot manipulators. However, most of these control methods ignore either joint friction or joint elasticity which can be caused by the transmission systems (e.g. belts and gearboxes). This study aims at development of a comprehensive control strategy for the tip-trajectory tracking of flexible-joint robot manipulators. While the proposed control strategy takes into account the effect of the friction and the elasticity in the joints, it also provides a highly accurate motion for the manipulators end-effector. During this study several approaches have been developed, implemented and verified experimentally/numerically for the tip trajectory tracking of robot manipulators. To compensate for the elasticity of the joints two methods have been proposed; they are a composite controller whose design is based on the singular perturbation theory and integral manifold concept, and a swarm controller which is a novel biologically-inspired controller and its concept is inspired by the movement of real biological systems such as flocks of birds and schools of fishes. To compensate for the friction in the joints two new approaches have been also introduced. They are a composite compensation strategy which consists of the non-linear dynamic LuGre model and a Proportional-Derivative (PD) compensator, and a novel friction compensation method whose design is based on the Work-Energy principle. Each of these proposed controllers has some advantages and drawbacks, and hence, depending on the application of the robot manipulator, they can be employed. For instance, the Work-Energy method has a simpler form than the LuGre-PD compensator and can be easily implemented in industrial applications, yet it provides less accuracy in friction compensation. In addition to design and develop new controllers for flexible-joint manipulators, another contribution of this work lays in the experimental verification of the proposed control strategies. For this purpose, experimental setups of a two-rigid-link flexible-joint and a single-rigid-link flexible-joint manipulators have been employed. The proposed controllers have been experimentally tested for different trajectories, velocities and several flexibilities of the joints. This ensures that the controllers are able to perform effectively at different trajectories and speeds. Besides developing control strategies for the flexible-joint manipulators, dynamic modeling and vibration suppression of flexible-link manipulators are other parts of this study. To derive dynamic equations for the flexible-link flexible-joint manipulators, the Lagrange method is used. The simulation results from Lagrange method are then confirmed by the finite element analysis (FEA) for different trajectories. To suppress the vibration of flexible manipulators during the manoeuvre, a collocated sensor-actuator is utilized, and a proportional control method is employed to adjust the voltage applied to the piezoelectric actuator. Based on the controllability of the states and using FEA, the optimum location of the piezoelectric along the manipulator is found. The effect of the controllers gain and the delay between the input and output of the controller are also analyzed through a stability analysis.

Postponement as a tool of creating flexibility is not a new concept. It traces back in literature to the 1950’s but was mainly argued as a method useful for manufacturing. However, postponement could potentially be used in all different parts of an organization to delay certain activities, and thereby create flexibility, which is crucial in today’s volatile marketplace. Customers are requiring customized products, yet they are not willing to pay premium for processes involved. Also, competition is increasing, as retailers around the globe compete with each other due to internet and improved information systems. This study focuses on a retailer’s perspective in the supply chain, as previous studies mainly discuss manufacturers, and their different abilities of achieving flexibility. Supply chain management as a concept are discussed, which is described as an integrative approach to dealing with the planning and control of the materials flow from suppliers to end users. This will further be “extended” to demand chain management, where focus lies at customers’ demand and puts emphasis on the needs of the marketplace and identifies the roles and tasks to be designed in the supply chain to satisfy these needs, instead of starting with the supplier/manufacturer and working forward. This is closely connected to flexibility, and postponement as a tool to achieve this. Flexibility as such, is described as the ability to change, or adapt to customer demand. This study aims to explore the Swedish retailing business, and their use of postponement strategies. A quantitative study has been made to be able to create a general picture of their use of this tool, as well as their prerequisite for adopting this tool. This study shows that retailing in general do have adopted strategies for customizations except non-specialized stores where answers to a wide extent differed regarding their use of flexibility. However, these strategies mainly regard packaging, and/or basic customizations. Depending on the market certain retailers are active within; postponement is used in various extents. Expensive products, or customers requiring big quantities of products, are able to get these customized. Money is almost always the main concern in these adaptations. Some factors that have been studied, that were enablers of flexibility and postponement strategies, were not able to be analyzed as very low results were calculated. However, the main-factors: flexibility and postponement were able to be analyzed in detail, as well as discussions regarding the inconclusive data gathered.

In most robot applications, the control of the manipulators end-effector along a specified desired trajectory is the main concern. In these applications, the end-effector (tip) of the manipulator is required to follow a given trajectory. Several methods have been so far proposed for the motion control of robot manipulators. However, most of these control methods ignore either joint friction or joint elasticity which can be caused by the transmission systems (e.g. belts and gearboxes). This study aims at development of a comprehensive control strategy for the tip-trajectory tracking of flexible-joint robot manipulators. While the proposed control strategy takes into account the effect of the friction and the elasticity in the joints, it also provides a highly accurate motion for the manipulators end-effector. During this study several approaches have been developed, implemented and verified experimentally/numerically for the tip trajectory tracking of robot manipulators. To compensate for the elasticity of the joints two methods have been proposed; they are a composite controller whose design is based on the singular perturbation theory and integral manifold concept, and a swarm controller which is a novel biologically-inspired controller and its concept is inspired by the movement of real biological systems such as flocks of birds and schools of fishes. To compensate for the friction in the joints two new approaches have been also introduced. They are a composite compensation strategy which consists of the non-linear dynamic LuGre model and a Proportional-Derivative (PD) compensator, and a novel friction compensation method whose design is based on the Work-Energy principle. Each of these proposed controllers has some advantages and drawbacks, and hence, depending on the application of the robot manipulator, they can be employed. For instance, the Work-Energy method has a simpler form than the LuGre-PD compensator and can be easily implemented in industrial applications, yet it provides less accuracy in friction compensation. In addition to design and develop new controllers for flexible-joint manipulators, another contribution of this work lays in the experimental verification of the proposed control strategies. For this purpose, experimental setups of a two-rigid-link flexible-joint and a single-rigid-link flexible-joint manipulators have been employed. The proposed controllers have been experimentally tested for different trajectories, velocities and several flexibilities of the joints. This ensures that the controllers are able to perform effectively at different trajectories and speeds. Besides developing control strategies for the flexible-joint manipulators, dynamic modeling and vibration suppression of flexible-link manipulators are other parts of this study. To derive dynamic equations for the flexible-link flexible-joint manipulators, the Lagrange method is used. The simulation results from Lagrange method are then confirmed by the finite element analysis (FEA) for different trajectories. To suppress the vibration of flexible manipulators during the manoeuvre, a collocated sensor-actuator is utilized, and a proportional control method is employed to adjust the voltage applied to the piezoelectric actuator. Based on the controllability of the states and using FEA, the optimum location of the piezoelectric along the manipulator is found. The effect of the controllers gain and the delay between the input and output of the controller are also analyzed through a stability analysis.

A contingency model describing the moderating effects of perceived environmental uncertainty on the relationship between human resource flexibility (HR flexibility) and firm performance was proposed and tested. This study aimed to examine the relationship between different dimensions of HR flexibility and firm performance and further investigated the moderating effect of environmental uncertainty on this relationship. A survey research was conducted using a sample of publicly traded firms listed in Taiwan Economic Journal data bank. Data was collected from different sources, including the opinions of CEO and HR managers in each company and the public disclosure of corporate information. Hierarchical regression analysis was used to test the hypotheses. After collecting empirical data and performing the factor analysis, five dimensions of HR flexibility, including behavior flexibility, skill flexibility, financial flexibility, functional flexibility, and market-oriented flexibility, were identified in this study. By testing Hypothesis1, results showed that skill flexibility, functional flexibility and market-oriented could predict some of the performance measures. However, behavior flexibility and financial flexibility had no significant influence on any firm performance measures. By testing Hypothesis2, three dimensions of environmental uncertainty were identified first. They were response uncertainty, effect uncertainty, and state uncertainty. Then, the results of the hierarchical regression models supported the argument that effect uncertainty positively moderated the influence of behavior, skill and functional flexibility on firm performance. But, the moderating effects of response and state uncertainty were not supported. Implications and future research directions were suggested in the final part of this study.

International commercial harbor is being in international, liberal and global conflict. It is facing the pressure of domestic and overseas market¡¦s competition. The enterprises need to reform the organization urgently. Harbor organization is researching to change from the enterprising organization of transportation into administrative legal person. The characteristics have the autonomy of personnel matters and utilize human resource flexibly. It is realized by way of implementing functional flexibility, numerical flexibility, temporal or working-time flexibility, wage or financial flexibility. The object is to serve for shipping company and increases employees ¡¦organizational adaptability, job efficiency, employees¡¦ productivity, service quality, personnel cost reduction and achieving budget target. At the same time, the organization utilizes flexible strategy have to consider the employees who have realized the change of job conditions. BY adjusting employees¡¦ work attitude which including job satisfaction, job involvement and organizational commitment etc. And then, it will increase organizational performance really. The study surveys the case organization which is the employees of the Kaohsiung Harbor Bureau (KHB). It utilizes employees¡¦ questionnaires to survey the influences of organization performance during the period of the strategy of implementing organization reform. The study finds the following results: 1. The perception of employees has significantly influences on organizational performance. 2. The functional flexibility has significantly influences on organizational performance. 3. The numerical flexibility has significantly influences on organizational performance. 4. The temporal or working-time flexibility has significantly influences on organizational performance. 5. The wage or financial flexibility has significantly influences on organizational performance. 6. The employees ¡¦different point of view on human resource utilization strategy will produce some differences due to different characteristics. According to the research result, implementing human resource flexible utilization which has significantly influences on organizational performance mostly. But different point of view on the strategy of human resource utilizing still have differences due to different characteristics. The KHB needs various kinds of improvable action to integrate employees¡¦ different point of view by communicating and coordinating with employees. Let employees understand the organizational reform is very important. It is in favor of organizational performance and increasing competitive power.

無 / The objective of this study is to establish a base for understanding inflexibility, with different kinds of integration problems being examined and explained. Studies of process integration have focused mostly on the design and management of efficient operation with information technology but very little on the difficulty in making changes with tightly linked processes. In order to eliminate risks of integration failure, there is a need for deep understanding of the types and causes of inflexibility with process integration. Based on the literature and industry experience of process integration and enterprise flexibility/inflexibility, this study proposes that inflexibility can be classified as either operational, organizational, or systems inflexibility. Sources of inflexibility have been investigated from views of business design, users’ willingness and capability, and systems designers’ designs. Cases studied shown that these three sources of inflexibility are interrelated and can reciprocally affect business performance. Companies applying process integration may eliminate the risk of integration downsides by carefully managing business design, user willingness and system design capability. Only with a broad and thorough view of the system, people and process interactions can a firm capitalize its investment in process integration.

Problematic levels of eating disorder (ED) spectrum problems are becoming increasingly pervasive on college campuses, especially among female college students. Research suggests that ED cognitions and a lack of body image acceptance are linked to diminished psychological flexibility (PF), which is linked to ED and other negative health symptoms. Two hundred thirty-six undergraduates completed an online survey, and mediation analyses were conducted. PF fully mediated the relation between ED cognitions and non-specific psychiatric symptoms and partially mediated the link between ED cognitions and ED symptoms. PF also partially mediated the link between body image acceptance and non-specific psychiatric symptoms, but not the relation between body image acceptance and ED symptoms. Findings suggest that clinical symptoms and one’s coping style are both important factors to take into consideration in case conceptualization and treatment, and suggest that therapies such as ACT that target PF may be beneficial in treating ED spectrum problems.

Nearly unpredictable turbulence on an overall economic level, radical changes in the legal framework and a shift in the moral concepts prevailing in the general public emphasize the importance of increased corporate flexibility. Usually, most flexibility measurements suffer from the defect that they are not pecuniary, that interactions between different flexibility dimensions are not considered and that they lack the required relatedness to the respective context. These problems contribute to a large extent to the fact that, when making investment decisions, the value of flexibility is considered but intuitively or insufficiently. Frequently, the results are irrational myopic pseudo decisions. The present work can be regarded as an attempt to design a pecuniary and context-related flexibility measure of three single flexibility dimensions in an extremely simplified framework and under restrictive assumptions. The primary method used is Monte Carlo Simulation. The present study shows that the value of flexibility can be substantive and that taking into account the interactions of various single flexibilities when strategic investments are made can be of great importance. In this paper, we work out the connection between "environmental volatility" and the "value of flexibility". Our work shows a numerically strong positive relation between these two properties. (author's abstract) / Series: Working Papers SFB "Adaptive Information Systems and Modelling in Economics and Management Science"

Abstrakt Det finns blandade åsikter om att en grad av rörlighet över det normala skulle vara främjande eller hämmande för prestationen och därför var syftet i denna studie att mäta rörlighet och den maximala hoppförmågan hos gymnaster, cheerleaders och individer som utövar parkour för att undersöka om rörligheten har någon betydelse för spänst/ explosivitet. Undersökningsgruppen bestod av 15 friska deltagare varav 8 män och 7 kvinnor i åldrarna 18-32 år. Deltagarna genomförde tre Countermovement jump hopp (CMJ) och static jump där markering gjordes på en vägg för att mäta hopphöjd. Enbens längdhopp mättes också. Aktiv rörlighet mättes i fotled vid både dorsalflexion, plantarflexion och sit and reach (bakre rörelsekedjan). Databearbetning gjordes i datorprogrammet IBM SPSS Statistics 21. Männen hoppade högre och längre än kvinnorna där skillnaden var signifikant vid alla hopptest. En signifikant skillnad i rörlighet fanns mellan kön där kvinnorna var rörligare i vänster dorsalflexion. Parkour gruppen hoppade högre än övriga gruppen (Gymnastik &amp; Cheerleading) där skillnaden var signifikant vid samtliga hopptest. Skillnad i rörlighet mellan parkour och övriga var endast signifikant vid vänster plantarflexion. Sambandsanalys visade starkast korrelation mellan plantarflexion och hoppförmåga där endast vänster plantarflexion och static jump var statistiskt säkerställt. Det finns indikationer som visar att spänst och explosivitet har ett samband med rörlighet men det saknas bevis för detta i den aktuella studien. Flera faktorer kan ha betydelse för hoppförmågan som bland annat teknik, disciplin och kön.