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The purpose of this paper is to develop a set of ground experiment system to verify the basic functions of space effector and the capturing reliability of space end-effector for the free-floating target payload in the three-dimensional space. The development of ground experiment system for space end-effector is essential and significant, because it costs too much to launch a space robot or other spacecraft and carry out operation tasks in space. Owing to the negligible gravity in space, which is different from that in the ground environment, ground experiment system for space end-effector should have the capability of verifying the basic functions of space effector and the reliability of space end-effector in capturing the free-floating target payload in space.

The ground experiment system for space end-effector mainly adopts the hybrid simulation method, which includes the real hardware experiment and software simulation. To emulate the micro-gravity environment, the contact dynamics simulator is applied to emulating the motion state of the free-floating target payload, while the admittance control is used to realize the “soft” capturing of space end-effector to simulate the real situation in space.

With the gravity compensation, the influence of gravity is almost eliminated and the results meet the requirements of the experiment. In the ground experiment, the admittance control is effective and the actual motion state of space end-effector capturing the target in space can be simulated. The experiment results show that space end-effector can capture the free-floating target payload successfully and hopefully have the ability to capture a free-floating target in space.

The system can verify space end-effector capturing the free-floating target payload in three-dimensional space and imitate the motion of space end-effector capturing the free-floating target in space. The system can also be modified and improved for application in the verification of space robot capturing and docking the target, which is valuable for the ground verification of space applications.

In this, the second part of a two‐part paper (Part I, Personnel Review, Summer 1977, pp 21–34) a survey of instances of work system design (WSD) experiments will be continued. As described in the Introduction to Part I, cases chosen for inclusion report the economic and human results of actual physical or structural innovations in a set or series of human tasks which, taken together, form some meaningful technical whole. The term ‘experiment’ is used in both Part I and II to refer loosely to change or manipulation of actual work activities, and not necessarily to well controlled laboratory experiments. In fact, most cases reported here are ‘natural’ and very few are carefully controlled.

This paper aims to present a case study of virtual-reality-based product demonstrations featuring items of furniture. The results will be of use in further design and development of virtual-reality-based product demonstration systems and could also support effective student learning.

A new method was introduced to guide the experiment by confirming orthogonal arrays. User interactions were then planned, and a furniture demonstration system was implemented. The experiment comprised two stages. In the evaluation stage, participants were invited to experience the virtual-reality (VR)-based furniture demonstration system and complete a user experience (UX) survey. Taguchi-style robust design methods were used to design orthogonal table experiments and planning and design operation methods were used to implement an experimental display system in order to obtain optimized combinations of control factors and levels. The second stage involved a confirmatory test for the optimized combinations. A pilot questionnaire was first applied to survey demonstration scenarios that are important to customers.

The author found in terms of furniture products, product interactive display through VR can achieve good user satisfaction through quality design planning. VR can better grasp the characteristics of products than paper catalogs and website catalogs. And VR can better grasp the characteristics of products than online videos. For “interactive inspection”, “function simulation”, “style customization” and “set-out customization” were the most valuable demonstration scenarios for customers. The results of the experiment confirmed that the “overall rating”, “hedonic appeal” and “practical quality” were the three most important optimized operating methods, constituting a benchmark of user satisfaction.

The author found that it is possible to design and build a VR-based furniture demonstration system with a good level of usability when a suitable quality design method is applied. The optimized user interaction indicators and implementation experience for the VR-based product demonstration presented in this study will be of use in further design and development of similar systems.

This two part paper represents an attempt to enumerate and analyse recent instances of work system design experiments in terms of the outcome measures sought or reported in those studies. ‘Work system design experiments’ is intended to include only experiments dealing with sets of interrelated jobs, as opposed to those experiments solely manipulating either jobs which are dealt with individually, or changes in such things as work environment, or management climate. The literature comprising experiments in work system design contains a wide range of general end results variables, but, however, suffers from the associated fact that these numerous outcome measures are frequently poorly conceived or operationalized, and are not easily compared with one another from study to study.

In shield tunneling projects, human, shield machine and underground environment are tightly coupled and interacted. Accidents often occur under dysfunctional interactions among them. Therefore, this paper aims to develop a multi-agent based safety computational experiment system (SCES) and use it to identify the main influential factors of various aspects of human, shield machine and underground environment.

The methods mainly comprised computational experiments and multi-agent technologies. First, a safety model with human-machine-environment interaction consideration is developed through the multi-agent technologies. On this basis, SCES is implemented. Then computational experiments are designed and performed on SCES for analyzing safety performance and identifying the main influential factors.

The main influential factors of two common accidents are identified. For surface settlement, the main influential factors are ranked as experience, soil density, soil cohesion, screw conveyor speed and thrust force in descending order of influence levels; for mud cake on cutter, they are ranked as soil cohesion, experience, cutter speed and screw conveyor speed. These results are consistent with intuition and previous studies and demonstrate the applicability of SCES.

The proposed SCES provides comprehensive risk factor identification for shield tunneling projects and also insights to support informed decisions for safety management.

A safety model with human-machine-environment interaction consideration is developed and computational experiments are used to analyze the safety performance. The novel method and model could contribute to system-based safety research and promote systematic understanding of the safety performance of shield tunneling projects.

The purpose of this paper is to consider queuing systems where captive repeat customers select a service facility each period. Are people in such a distributed system, with limited information diffusion, able to approach optimal system performance? How are queues formed? How do people decide which queue to join based on past experience? The authors explore these questions, investigating the effect of information availability, as well as the effect of heterogeneous facility sizes, at the macro (system) and micro (individual performance) levels.

Experimental economics, using a queuing experiment.

The authors find little behavioural difference at the aggregate level, but observe significant variations at the individual level. This leads the authors to the conclusion that it is not sufficient to evaluate system performance by observing average customer allocation and sojourn times at the different facilities; one also needs to consider the individuals’ performance to understand how well the chosen design works. The authors also observe that better information diffusion does not necessarily improve system performance.

Evaluating system performance based on aggregate behaviour can be misleading; however, this is how many systems are evaluated in practice, when only aggregate performance measures are available. This can lead to suboptimal system designs.

There has been little theoretical or empirical work on queuing systems with captive repeat customers. This study contributes to the understanding of decision making in such systems, using laboratory experiments based on the cellular automata approach, but with all agents replaced by humans.

Bibliographical materials are often produced on a low budget and against a deadline, and the design of the material often does not adequately represent the structure of the information or facilitate its use. Two studies concerned with optimizing the effectiveness of design given certain practical constraints are reported here. In the first study, ten coding systems suitable for distinguishing between entries in typewritten bibliographies were tested. Subjects were given sections of author index typed in different styles, together with lists of authors' surnames to be found in the test material within a set time. The most effective system made a clear distinction between entries, and between the first element of each entry and the rest of the entry, by indentation. In the second study, the effectiveness of six spatial and three typographic coding systems for distinguishing between entries and between elements within entries in typeset bibliographies was tested for two different search tasks. In Experiment I, subjects were given lists of authors' surnames to find in the test material; in Experiment 2 they were given lists of titles. Spatial coding was more effective than typographic coding in Experiment 1; the reverse was true for Experiment 2. The most effective spatial coding systems in both experiments were those which clearly distinguished the start of each entry by line spacing or indentation. The use of capitals for authors' surnames was the most effective typographic coding system in Experiment 1; the use of bold for titles was the most effective in Experiment 2. The best compromise for both search tasks is likely to incorporate line spacing between entries with elements within entries running on, and bold titles.

Presents a critical review of the role of laboratory experiments in information systems research. In an attempt to highlight the issues raised by laboratory experiments, presents a thought experiment of such an experiment. The thought experiment indicates the problem of distinguishing between that which is done to complete the task and that which is done to complete the requirements of the experiment. Further develops an understanding of this problem by presenting the work of Heidegger, Merleau‐Ponty and others. From this discussion, shows that people develop styles for coping in the world that do not allow them to “break up” the world into discrete objects, events, persons, and so forth. Based on this discussion, argues that it is impossible for the observer as well as the observed to know whether their style of coping in the experiment is a style of coping with the world or a style of coping with the requirements and constraints of the experiment. From this discussion, concludes that most laboratory experiments in information systems research have neither internal nor external validity. As such, they should be actively discouraged.

The purpose of this paper is to propose a new system frame named ACPI for research and development (R&D) management of complex equipments according to the ideas of artificial societies, computational experiments, parallel execution and interactive optimization.

An artificial system which can effectively model, simulate and recur the main features and behaviors of a real R&D system of complex equipment is established at first. The structure and function of the system and its subsystems, and the relation of factors in the system are analyzed. Then one can perform computation experiment, modeling and simulation in the artificial system to obtain the optimal solutions. Finally, practice these solutions in a real system and at the same time perform the solutions in artificial system, forecasting and warning the possible new situations and problems in a realistic process, and provide controlling scheme.

The typical characteristics and solutions of the R&D system of complex equipment are analyzed. The sketch scheme of ACPI, the system frame of ACPI for R&D management of complex equipments are proposed, and the key technologies used in implementing ACPI of R&D system of complex equipment are studied.

The outcome of this paper can be used in computation experiments, management and optimization of R&D systems of complex equipment.

The sketch scheme of ACPI, the system frame of ACPI for R&D management of complex equipments are proposed first. The ACPI system can supply a high‐performance, open and interactive platform for the analog simulation and computation experiments of the R&D process management of complex equipment.

The purpose of this paper is to empirically analyze the role of differentiated margin system in leading investors' investing behavior and then optimize investor structure in futures markets.

Using economic experimental research method, this paper designs and conducts a futures market experiment according to experimental research's basic norms, thus acquiring needed and credible empirical data.

By analyzing the experimental data, it is found that compared with situations in futures markets that implement uniform margin system, investors' (especially speculators') futures open position and the ratio of their open position and futures turnover are both significantly higher, in futures markets that implement differentiated margin system. On the other hand, differentiated margin system has no effects on hedgers' futures turnover, but significantly reduces speculators' futures turnover.

The findings suggest that compared with uniform margin system, differentiated margin system is beneficial to effectively restrict both speculators' and hedgers' speculating behavior and lead hedgers' market participation.

In order to resolve the problem of unreasonable investor structure in China's futures market, i.e. lack of hedgers and over‐speculating, China's futures market's regulators should reform the margin system and adopt differentiated margin system to lead investors' rational behavior and optimize investor structure.

This paper empirically analyzes and verifies, for the first time, the roles of differentiated margin system in affecting investors' investing behavior. The futures market experiment designed and used in this study is a pioneering and exploratory experiment.