Study on the Quality Control of Reputation-Based on Incentive Service-Oriented Manufacturing Network

Manufacturing enterprises, manufacturing services and customer constitute the service-oriented manufacturing dynamic network (SMN). The quality of SMN mainly depends on the service module provider. Under the condition of information asymmetry in the market, service module provider pursuits for self-interest maximization, may take quality speculation. Based on the reputation incentive theory, this paper establishes an optimal SMN node quality behavior dynamic model of the contract which combines with dominant incentive mechanism and reputation incentive mechanism, discusses the factors which influence the service module provider’s effort level, the conditions of realizing effective reputation incentive and the ways to improve reputation incentive effect.


Introduction
Under the condition of information asymmetry in the market, the reputation, as a signal which reflects the information of enterprises, is delivered among different traders, and traders make choices depend on corporate reputation before making a deal.Establishing a good corporate reputation can not only make the enterprise get more development opportunities also can bring long-term economic value.W. Liu [1] studied the r & d outsourcing dynamic incentive mechanism based on the theory of the reputation, and established a dynamic incentive mechanism model of corporate r & d outsourcing; Y.Q.Tan [2] studied the effect of reputation in the outsourcing service provider reputation incentive mechanism, raised that reputation incentive can improve service provider's effort in the early stage and constraint moral hazard from service provider; H.M. Guo [3] studied the dynamic incentive contract of supply chain which considered the cost of reputation, found out the relationship between reputation compensation and the type of manufacturers, cost, achieved the effect of weakening "ratchet effect"; B.H. Peng [4] built the trust game model between the module integrator and suppliers, pointed out that the reputation had became an effective incentive of cooperative members.
The service-oriented manufacturing network which is formed in the process of manufacturing and services integration development, is a kind of ability and demand cooperation network.The value module node of manufacturing enterprises base on service demand and service ability, service enterprises of relevant departments or personnel and customer is the composition of the SMN, and mainly contains service integration module node, service production and productive service module module node.Each node through the exchange of each others products or services to gain economic interests to promote the development of itself.The quality problem of the trade in tangible goods, and intangible items, such as service products, service attitude, goods delivery time.The above issues are collectively referred to as network node quality problems.H. P. Liang [5] presented the arrangement way of quality control in manufacturing network; J. X.You [6] studied the quality control of supply chain strategy problem under the condition of moral hazard; L. Q. Feng [7] marched the modular classification for SMN, established the model, respectively to measure the adaptability quality coordination and cooperation, the quality contract modular coordination level of quality.
This paper analyzes the role of the relationship between individual nodes from the perspective of the reputation contract, try to research the influence of reputation on the service module provider engaged in its own node quality behavior.

Basic Assumptions and Symbols Introductions
This paper considers only a simple SMN structure.For the convenience of modeling and analysis, the service production and the productive service module node are collectively referred to as service module provider, and the service integration module node is called service module integrator.
Hypothesis 1: Service module provider as the agent, service module integrator as the principal.Service module integrator cannot directly observe the management ability and the effort level what service module provider engaged in its node quality behaviors, can only observe some other variables.
Hypothesis 2: Principal-agent contract only has two phases, service module provider each phase of the output function: & ( 1, 2) t π is the output of service module provider in the first phase ; θ is service module providers management ability and its size is not related to the time; t e is the effort level that service module provider engaged in his own node quality behaviors in the t phase, & t represents exogenous random factors, such as the uncertainty of technology or market.
Hypothesis 3: Effort level t e is the service module providers private information, output is the known in- formation, e is the actual level of ef- fort that service module provider engaged in its own node quality behavior in the first phase.When service module integrator observed 1 π , he knows , τ is the ratio of the variances of the θ and 1 π , 1 0 τ > > [8].
According to the above hypotheses, it is concluded that the following formulas: var( ) [ ] In the Formula (2), 1 ( / ) E θ π expresses the expectations that service module integrator to service module providers management ability θ , under the condition of determining the output 1 π in phase 1; in the Formula (4), ( / ) E π π expresses the expectations that service module integrator to service module providers output in phase 2 under the condition of determining output 1 π in phase 1; in the Formula ( 6), M Z expresses the ser- vice module integrators certainty equivalent income; in the Formula (7), S Z expresses the service module pro- viders certainty equivalent income.

The Static Contract Model of SMN's Node Quality Behavior without Considering Reputation Incentive Mechanism
The static optimal contract model is set up as follows: e e e e be e be Get the models first-order conditions: The results suggest that the optimal effort level that service module provider engaged in his own node quality behaviors depends on the effort cost coefficient b and contract incentive coefficient β .

The Dynamic Contract Model of SMN's Node Quality Behavior Considering Reputation Incentive Mechanism
Considering the influence of reputation in phase 1, the theoretical dynamic contract model is set up as follows: The Equation (13b) refers that at the beginning of phase 1, service module providers certainty equivalent income by contract can't less than the external opportunity cost expectations 1 µ ; but at the beginning of phase 2, the retained income level is affected by his output in phase 1. Good output will improve service module providers bargaining power, and further improve his external choices in the market.In the Formula (13c), m is con- stant, n is service module providers bargaining power, Z Z represent respectively service providers and service module integrators certainty equivalent income in phase 2.
By Equation ( 16), it can be seen that the maximization of the service module integrator in the target equals the principal-agent both sides the certainty equivalent income sum of the two phases.The determination of the optimal contract also needs to satisfy the service module provider's incentive compatibility constraint in two stages: Because we assume the linear contract only two phases, the output of the phase 2 will not affect service module provider's reward of the late, so under the condition of having been given contracts of the phase 2, service module provider will choose 2 e to maximize his current certainty equivalent income.By Equation ( 18), get the optimal first-order conditions: 2 2 2 e b β = .At the beginning of the second phase, service module integrator bases on the information of phase 1 to set the current contract which must satisfy the participation constraint of service module provider to maximize his certainty equivalent income in phase 2. Similar to the type (16), Service module integrator also refers to the maximization about the principal-agent both the certainty equivalent income sum of the two phases: Summarize the above discussion, the optimal model of the dynamic contract design is established as follows:  1), ( 2), (5), get: Further: 22) shows that the optimal effort level that service module provider engaged in his own node quality behaviors only depends on the effort cost coefficient b and contract incentive coefficient 2 β , because it is the last phase of the contract, so is not bound by reputation mechanism.Equation (23) shows that service module providers management ability, the more uncertainty, the greater the incentive coefficient of the second phase.

The Analysis and Conclusion of Two Models
By contrasting Equations ( 22) and (10), , showing that after considering reputation mechanism, the effort level that service module provider engaged in his own node quality behavior in Phase 2 is better than the level without considering reputation mechanism.The quality of SMN is mainly depends on the effort level that service module provider engaged in his own node quality behavior, so we get proposition 1. Proposition 1: After the introduction of reputation mechanism, the quality level of SMN in the phase 2 is improved.By (28) Proposition 3: Before the event, the more uncertain that service module integrator to service module providers management ability (τ ), the greater reputation incentive effect.So it can effectively improve the effort level that service module provider engaged in his own node quality behavior, reduce the motivation that service module provider take the quality speculation.The quality of SMN can have a good control effect.
Comparing Formula (28) and ( 10 , so we get proposition 4. Proposition 4: the effort level that service module provider engaged in his own node quality behavior in Phase 1 is better than the level without considering reputation mechanism, in other words, the quality level of SMN in the phase 1 is improved. Analyzing formulas (25), we can see that reputation influences 2 s by influencing the fixed income 2 α .
Formula ( ) shows that the income of service module provider in the second stage, on the one hand, is influenced by its current output, on the other hand also by service module integrator ' s expectation to its management ability θ .So we get proposition 5.

Conclusion
In order to control the quality of SMN, improve the effort level that service module provider engaged in his own node quality behavior, this paper establishes an optimal dynamic linear contract model which combined explicit incentive mechanism and reputation incentive mechanism.The model under certain conditions can achieve the effective reputation incentive and enhance the reputation incentive effect.When meet the conditions, considering the reputation mechanism of the SMN node quality behavior model of the dynamic contract design compares to without considering quality reputation incentive mechanism of the SMN node behavior static model of the contract, effectively improves the effort level that service module provider engaged in his own node quality behavior, improves contract incentive strength, the quality of SMN and realizes the Pareto improvement.

1 π
but can't separate θ and 1 & , in other words, he is not clear that except 1 e , is the results of the enterprise operation ability θ or the result of exogenous uncertainty 1 & .Service module integrator need on the basis of 1 π to infer θ .
produces a positive effect which prompts service module provider to improve payment of the phase 1 in order to improve the production of phase 2.Synthesize the above discussions, If reputation mechanism can well control the quality of SMN, it is thus clear The market is rational expectations.In the first phase equilibrium, 1 , the better reputation of service module provider, the higher optimal effort level that service module provider engaged in his node quality behavior, and the better quality of SMN.