Indonesian rubber farming has the largest area in the world, but its implementation faces various risks that decrease productivity and farm income. This study is designed to specify the risk perception, risk attitude and determinant factors for smallholder rubber farmers. The research location was in four subdistricts in West Kalimantan Province, with a sample size of 200 farmers. Data collection was carried out by interview using a structured questionnaire. The risk matrix, Holt and Laury's method and the logit model were used to identify risk perception, risk attitude and determinant factors. The study results showed that most rubber farmers were risk-averse and perceived climate change, plant diseases and price change as high risks. The logit model found that farmers' age, education, rubber plantation size, rubber age, distance and use of rubber clones had a positive and significant effect on farmers' risk perception, while the family size and farming experience had a negative effect. Regarding risk attitude, the logit model found that rubber age, distance and risk perception of price change had a positive and significant effect on farmers' risk aversion, while farmers' age and use of rubber clones had a negative effect. This study recommends providing informal education to the farmers through training and counseling, encouraging the farmers to replant old or damaged rubber trees and adopt rubber clones. Furthermore, it is also necessary to improve road facilities and infrastructure, communication and transportation access to facilitate farming activities.
Citation: Imelda, Jangkung Handoyo Mulyo, Any Suryantini, Masyhuri. Understanding farmers' risk perception and attitude: A case study of rubber farming in West Kalimantan, Indonesia[J]. AIMS Agriculture and Food, 2023, 8(1): 164-186. doi: 10.3934/agrfood.2023009
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Indonesian rubber farming has the largest area in the world, but its implementation faces various risks that decrease productivity and farm income. This study is designed to specify the risk perception, risk attitude and determinant factors for smallholder rubber farmers. The research location was in four subdistricts in West Kalimantan Province, with a sample size of 200 farmers. Data collection was carried out by interview using a structured questionnaire. The risk matrix, Holt and Laury's method and the logit model were used to identify risk perception, risk attitude and determinant factors. The study results showed that most rubber farmers were risk-averse and perceived climate change, plant diseases and price change as high risks. The logit model found that farmers' age, education, rubber plantation size, rubber age, distance and use of rubber clones had a positive and significant effect on farmers' risk perception, while the family size and farming experience had a negative effect. Regarding risk attitude, the logit model found that rubber age, distance and risk perception of price change had a positive and significant effect on farmers' risk aversion, while farmers' age and use of rubber clones had a negative effect. This study recommends providing informal education to the farmers through training and counseling, encouraging the farmers to replant old or damaged rubber trees and adopt rubber clones. Furthermore, it is also necessary to improve road facilities and infrastructure, communication and transportation access to facilitate farming activities.
Time delay systems represent one of the most popular class of systems. Time delay, whether occurs in the system state, the control input, or the measurement, is often inevitable in practical systems and can be a source of instability and poor performance [21,19,1,61,41,20,94,95,79,72]. The future evolution of the system state of a time delay system depends not only on its current value, but also on its past values [124,15,88,87,55,121,111,81,34,14,117,46]. Many processes have time delay characteristics in their dynamics. Since time delays often appear in engineering, biological and economical systems, and sometimes they may poorly affect the performance of a system. The problem of stability of IDSs and impulsive stabilization of delay systems have been extensively investigated [119,108,104,96,36,98,18,24]. For example, [104] studied the stability of a class of nonlinear impulsive switching systems with time-varying delays. Based on the common Lyapunov function method and Razumikhin technique, several stability criteria are established for nonlinear impulsive switching systems with time-varying delays. In [98], by structuring hybrid impulsive and feedback controllers, synchronization problem of the memristive delayed neural networks is proposed. Then, based on differential inclusions, several synchronization criteria for the memristive delayed neural networks are obtained by impulsive control theories, special inequalities and the Lyapunov-type functional. In literatures, the research results concerning time delay systems can be classified into two types. One is delay-independent conditions, the other is delay-dependent conditions. Delay-dependent conditions are less conservative compared with the delay-independent conditions because they incorporate the information of time delays. Various techniques have been developed in literatures to derive delay-dependent conditions, such as the Lyapunov-Razumikhin method and the Lyapunov-Krasovskii functional method [18]. In [24], the authors proposed the equivalence between stability conditions for switched systems and the Lyapunov-Krasovskii functional stability conditions for discrete-time delay systems. This provides us another method to investigate time delay systems.
Impulsive effects exist widely in the world. As we know, the state of systems are often subject to instantaneous disturbances and experience abrupt changes at certain instants, which might be caused by frequent changes or other suddenly noises. These systems are called impulsive systems, which are governed by impulsive differential equations or impulsive difference equations [42,118,59,57,2]. In the past decades, there has been a growing interest in the theory of impulsive dynamical systems because of their applications to various problems arising in communications, control technology, impact mechanics, electrical engineering, medicine, biology, and so on [54,28,22,17,33,32,106,3,112,74,100,75,83,31]. For example, [54] investigated the
By analyzing related literatures, this paper provides a comprehensive and intuitive overview for IDSs, which include the basic theory of IDSs, stability analysis with impulsive control and impulsive perturbation, and delayed impulses. Essentially, it provides an overview on the progress of stability and stabilization problem of IDSs. The rest of this paper is organized as follows. In Section 2, some notations and definitions of stability are presented. Section 3 covers the effects of impulses for IDSs. Section 4 considers the impulsive control problem. Section 5 considers the impulsive perturbation problem. Section 6 covers the delayed impulses. Section 7 concludes the paper and discuss the future research direction on this topic.
Notations. Let
In recent years, there are many results on impulsive delayed systems (IDSs). Roughly speaking, an impulsive dynamical system consists of three elements: a continuous-time dynamical equation, which governs the evolution of the system between reset (impulsive) events; a difference equation, which describes the way the system states are instantaneously changed; and finally a criterion for determining when the states of the system are to be reset. In addition, it is well known that time-delays phenomena frequently appear in many practical problems, such as biological systems, mechanical, transmissions, fluid transmissions, networked control systems [122,47,123,86,80,25,45]. Therefore, it is not surprising that IDSs with time delays have become an attractive research field. In the following, consider the impulsive functional differential equation
{˙x(t)=f(t, xt), t>t0, t≠tk,Δx=Ik(t, x(t−)), t=tk, k∈N, | (1) |
where
xt0=ϕ, | (2) |
where
Definition 2.1. [85]. A function
Under the following hypotheses
Assume that conditions
Definition 2.2. [56]. The trivial solution of system (1) is said to be
||x(t, t0, ϕ)||≤k(δ)e−λ(t−t0), ∀t≥t0. |
Definition 2.3. [38]. A map
(ⅰ)
(ⅱ)
Definition 2.4. [38]. Let
Definition 2.5. [109]. The function
(1)
(2)
Definition 2.6. [109]. Let
D+V(t,ψ(0))=limh→0+sup1h[V(t+h,ψ(0)+hf(t,ψ))−V(t,ψ(0))], |
for
Generally speaking, existing results on stability for IDSs can be classified into two groups: impulsive stabilization and impulsive perturbation. In the case where a given equation without impulses is unstable or stable, it can be tended to uniformly stable, uniformly asymptotically stable even exponentially stable under proper impulsive control. Such case is regarded as impulsive stabilization. In the case where a given equation without impulses is stable, and it can remain the stability behavior under certain impulsive interference, it is regarded as impulsive perturbation. At each discontinuous point
(1) When
(2) When
(3) When
In the following, two examples are given to illustrate the effects of impulses for the IDSs.
Example 3.1. Consider a simple IDS:
{˙x(t)=0.5x(t)+0.6x(t−1),t≥0,x(k)=μx(k−),k∈N, | (3) |
where
Example 3.2. Consider another IDS:
{˙x(t)=−0.7x(t)+0.35x(t−1),t≥0,x(k)=μx(k−),k∈N, | (4) |
where
The above two examples fully illustrate the different effects of impulse for stability on the IDSs. In resent years, there are many researches on stability analysis for IDSs. For example, in [63], criteria on uniform asymptotic stability were established for impulsive delay differential equations by using Lyapunov functions and Raxumikhin techniques. [44] presented some sufficient conditions for global exponential stability for a class of delay difference equations with impulses by means of constructing an extended impulsive delay difference inequality. In [39], authors addressed the impulsive systems with unbounded time-varying delay and introduced a new impulsive delay inequality that involves unbounded and non-differentiable time-varying delay. Some sufficient conditions ensuring stability and stabilization of impulsive time-invarying and time-varying systems are derived, respectively. [115] investigated the synchronization problem of coupled switched neural networks (SNNs) with mode-dependent impulsive effects and time delays. The impulses considered here include those that suppress synchronization or enhance synchronization. Based on switching analysis techniques and the comparison principle, the exponential synchronization criteria are derived for coupled delayed SNNs with mode-dependent impulsive effects. In addition, the concept of ''average impulsive interval" was introduced in [68] by referring to the concept of average dwell time [23] to characterize how often or how seldom impulses occur.
Definition 3.3. [68]. The average impulsive interval (AII) of the impulsive sequence
T−tτα−N0≤Nξ(T,t)≤T−tτα+N0, ∀T≥t≥0, | (5) |
where
For most impulsive signals, the occurrence of impulses is not uniformly distributed. Fig.3.3 presents a specific form of a non-uniformly distributed impulsive sequence. One may observe from Fig. 3.3 that the impulses seldom occur in some time intervals, but frequently occur in some other intervals. For such impulsive signals, it is possible that the lower bound of the impulsive intervals is small or the upper bound is quite large. Hence, many previous results cannot be effectively applied to dynamical systems with the impulsive signal shown in Fig. 3.3.
In addition, note that inequality (5) can be rewritten as follows:
Nξ(T,t)≥T−tτα−N0, ∀T≥t≥0 | (6) |
Nξ(T,t)≤T−tτα+N0, ∀T≥t≥0. | (7) |
When the original system without impulsive perturbation is stable, and the impulsive effects are harmful, in order to guarantee the stability, the impulses should not occur frequently. That is, there should always exist a requirement that
Hence, the concept of AII is suitable for characterizing a wide range of impulsive signals. In recent years, there are many results using the concept of AII [110,7,71,68,32]. For instance, the global exponential synchronization of delayed complex dynamical networks with nonidentical nodes and stochastic perturbations was studied in [110]. By combining adaptive control and impulsive control schemes, the considered network can be synchronized onto any given goal dynamics. With respect to impulsive control, the concept named AII with ''elasticity number'' of impulsive sequence is utilized to get less conservative synchronization criterion. [7] investigated the problems of impulsive stabilization and impulsive synchronization of discrete-time delayed neural networks (DDNNs), where two types of DDNNs with stabilizing impulses were studied. [71] established finite time stability (FTS) criteria for the nonlinear impulsive systems, where by using AII method, less conservative conditions were obtained for the FTS problem on the impulsive systems.
Impulsive control is to change the state of a system by discontinuous control input at certain time instances. From the control point of view, impulsive control is of distinctive advantage, since control gains are only needed at discrete instances. Thus, there are many interesting results on impulsive stabilization of IDSs. Considering the IDSs (1), authors in [63] established some criteria on uniform asymptotic stability by using Lyapunov functions and Razumikhin techniques, which is given as follows:
Theorem 4.1. [63]. Assume that there exist functions
(ⅰ)
(ⅱ)
(ⅲ)
(ⅳ)
Then the trivial solution of (1) is uniformly asymptotically stable.
It follows from the definitions
Based on the ideas given in [63], authors in [105] and [103] further investigated exponential stability and global exponential stability of solutions for IDSs (1), respectively, which play important effects on exponential stability analysis of impulsive time-delay systems.
Theorem 4.2. [103]. Assume that there exist a function
(ⅰ)
(ⅱ)
(ⅲ)
(ⅳ)
Then the trivial solution of (1) is globally exponentially stable and the convergence rate is
For all the above studies [63,105,103], authors have investigated for the uniform asymptotical stability and global exponential stability of IDSs under the assumption that
Consider the following impulsive functional differential equations:
{˙x(t)=F(t, x(⋅)), t>t0, t≠tk,Δx=Ik(t, x(t−)), t=tk, k∈N,xt0=ϕ(s), α≤s≤0. | (8) |
Some detailed information can be found in [36]; here we omit it.
Theorem 4.3. [36]. Assume that there exist a function
(ⅰ)
(ⅱ) For any
(ⅲ) For all
(ⅳ)
Then the trivial solution of (8) is globally exponentially stable.
It should be noted that in [36], for
Hence, investigation of periodic solution for system is indispensable for practical design and engineering applications of models. The periodic solution problem of IDSs has found many applications such as associative memories, pattern recognition, machine learning, robot motion control, and so on [76,97,82,27]. For example, in [49], a class of recurrent neural networks with discrete and continuously distributed delays was considered. Sufficient conditions for the existence, uniqueness, and global exponential stability of a periodic solution were obtained by using contraction mapping theorem and stability theory on impulsive functional differential equations. [38] dealt with the periodic solutions problem for impulsive differential equations. By using Lyapunov's second method and the contraction mapping principle, some conditions ensuring the existence and global attractiveness of unique periodic solutions were derived, and so on [37,84,101,26].
In addition, the stability analysis is much more complicated because of the existence of impulsive effects and stochastic effects at the same time. In [12], based on the Razumikhin techniques and Lyapunov functions, several criteria on the global exponential stability and instability of impulsive stochastic functional differential systems were obtained. The results show that impulses make contribution to the exponential stability of stochastic differential systems with any time delay even they are originally unstable. In [77], authors investigated the
In what follows, an example is given to illustrate the existence and attractiveness of the periodic solution for impulsive control system.
Example 4.4. [49]. Consider the following neural networks with discrete delays:
{˙x1(t)=−[0.15+0.05sin2πωt]x1(t)+2∑j=1[0.3−0.01cos2πω(t+j)])×fj(xj(t)+2∑j=1[0.1+0.04sin2πω(t+j)]fj(xj(t−1))+cos2πωt, t≠tk,˙x2(t)=−[0.2+0.1sin2πωt]x2(t)+2∑j=1[0.17+0.02sin2πω(t+j)]×fj(xj(t))+2∑j=1[0.1+0.01sin2πω(t+j)]fj(xj(t−1))+sin2πωt, t≠tk, | (9) |
subject to impulses:
xi(tk)=1ρxi(t−k),k∈Z+, i=1,2, |
where
In the simulations, one may observe that system (9) with
In this case where a given equation without impulses is stable, and it can remain the stability behavior under certain impulsive interference, it is regarded as impulsive perturbation problem. Considering the IDSs (1), authors in [63] established a criteria on uniform asymptotic stability, where there exists impulsive perturbation.
Theorem 5.1. [63]. Assume that there exist functions
(ⅰ)
(ⅱ)
(ⅲ)
(ⅳ)
where
Theorem 5.1 is in some ways the opposite of Theorem 4.1. Here the derivative of
Theorem 5.2. [66]. Assume that hypotheses
(ⅰ)
(ⅱ)
(ⅲ) for
(ⅳ) For any
Then the trivial solution of (1) is exponentially stable.
Based on the idea in [66], ref. [60] investigated input-to-state stability (ISS) and integral input-to-state stability (iISS) of impulsive and switching hybrid systems with time-delay, using the method of multiple Lyapunov-Krasovskii functionals. It is also shown that the results in the present paper can be applied to systems with arbitrarily large delays and, therefore, improve the results in [66]. In addition, [68] presented a new concept AII, which can be used to describe impulsive signals with a wider range of impulsive interval. Based on this concept, a unified synchronization criterion was obtained for impulsive directed dynamical networks with desynchronizing impulses or synchronizing impulses. However, there is no time delay in it. [114] addressed the stability problem of a class of delayed neural networks with time-varying impulses. Different from the results in Lu et al. [68], the impulses considered here are time-varying, which can cover the results in Lu et al. [68]. From the obtained results in [114], we can see that even if destabilizing impulsive effects occur frequently, the delayed neural networks can also be stable if stabilizing impulses can prevail over the influence of destabilizing impulsive effects.
To data, impulsive perturbation problem has been widely investigated [89,91,13,113,92,40,65,58,38,43,73,67,102,90,69,70,120]. For example, in [113], the global exponential stability of complex-valued impulsive systems was addressed. Some new sufficient conditions were obtained to guarantee the global exponential stability by the Lyapunov-Razumikhin theory. Authors in [92] studied the problem of impulsive effects on global exponential stability for a class of impulsive n-dimensional neural networks with unbounded delays and supremums. The robust exponential stability of nonlinear impulsive switched delayed systems was investigated in [67]. In [48], the stability problem of impulsive functional differential equations (IFDEs) was considered. Several criteria ensuring the uniform stability of IFDEs with finite or infinite delay were derived by establishing some new Razumikhin conditions. authors investigated the stability problem of time-delay systems with persistent impulses and focused on the discussion of systems with unbounded time-varying delays in [40]. The above results have been discussed the stability for impulsive perturbation systems, where the impulsive perturbation exists in system but not destroy the stability property.
Sometimes, the impulsive perturbation can change the dynamics of a time-delay system. For example, a stable equilibrium may becomes a periodic attractor under impulsive perturbation. To show this observation, we illustrate the following example:
Example 5.3. Consider the 2D impulsive delayed neural networks
{˙x(t)=−Ax(t)+Bf(x(t−τ)),t≥t0,x(k)=Kx(t−k),k∈N, | (10) |
where
A=(0.9000.9), B=(0.5−110.4), f(x(t−τ))=tanh(x(t−τ)), τ=1. |
One may observe that when there is no impulsive perturbation on the system (10), i.e.,
Over the past few decades, many stability criteria for IDSs have been proposed. However, most existing results on IDSs do not consider the effect of delayed impulses. Of current interest is the delayed impulses of dynamical systems arising in such applications as automatic control, secure communication and population dynamics, [64,29,10,8,30]. Delayed impulse describes a phenomenon where impulsive transients depend on not only their current but also historical states of the system, see [16,107,11,52,51]. For instance, in communication security systems based on impulsive synchronization [8,30], there exist transmission and sampling delays during the information transmission process, where the sampling delay created from sampling the impulses at some discrete instances causes the impulsive transients depend on their historical states. Another example, in population dynamics such as fishing industry [52,51,99,50], effective impulsive control such as harvesting and re- leasing can keep the balance of fishing, and the quantities of every impulsive harvesting or releasing are not only measured by the current numbers of fish but also depend on the numbers in recent history due to the fact that the immature fish need some time to grow.
In the previous literature concerning impulsive systems, the impulses are usually assumed to take the form:
Δx(tk)=x(tk)−x(t−k)=Bkx(t−k), |
which indicates the state 'jump' at the impulse times
Δx(tk)=x(tk)−x(t−k)=Bkx(tk−τ), |
where
x(t)=x(t−)+Bkx((t−dk)−), t=tk, k∈N, |
where
x(t)=C0kx(t−)+C1kx((t−dk)−), t=tk, k∈N, |
as a special case. The results in [10] dealt with both destabilizing delayed impulses and stabilizing delayed impulses, and derived the corresponding Lyapunov-type sufficient conditions for exponential stability. In the application of networked control systems, due to the finite speed of computation, a type of delayed impulses which are called sensor-to-controller delay and controller-to-actuator delay do exist in a working network [107,11]. Authors in [52] studied the delayed impulsive control of nonlinear differential systems, where the impulsive control involves the delayed state of the system for which the delay is state-dependent. [51] focused on stability problem of nonlinear differential systems with impulses involving state-dependent delay based on Lyapunov methods. Some general and applicable results for uniform stability, uniform asymptotic stability and exponential stability of the systems were derived in [51] by using the impulsive control theory and some comparison arguments. It shows how restrictions on the change rates of states and impulses should be imposed to achieve system's stability, in comparison with general impulsive delay differential systems with state-dependent delay in the nonlinearity, or the differential systems with constant delays.
With the development of impulsive control theory, some recent works have focused on input-to-state stability (ISS) property of time-delay control system under the delayed impulsive control. For example, [116] addressed the ISS and integral input-to-state stability (iISS) of nonlinear systems with distributed delayed impulses. [53] studied the ISS property of nonlinear systems with delayed impulses and external input affecting both the continuous dynamics and the state impulse map. However, it seems that there have been few results that consider the effect of delayed impulses on ISS property for nonlinear systems, which still remains as an important direction in research fields.
IDS is a very important research area with wide applications. Stability analysis is one of the fundamental problems for IDSs. This paper has overviewed the research area of IDSs with emphasis on the following topics:
(ⅰ) We described the general IDSs and presented the existence and uniqueness of solutions for IDSs. Moreover, we introduced the effects of impulses on stability for IDSs, which includes impulsive stabilization and impulsive perturbation. Examples were given to illustrate the effects of impulses. In addition, the concept of AII was introduced to characterize how often or how seldom seldom impulses occur.
(ⅱ) We presented sufficient conditions for IDSs, where the impulses contribute to system dynamics. In this sense, an example was illustrated to show the existence of periodic attractor under impulsive control, where there is originally no periodic attractor.
(ⅲ) We presented sufficient conditions for IDSs, where the impulsive effects are harmful. In this sense, we illustrated an example to show the effects of impulsive perturbation for periodic solutions. It indicates that the dynamics of time-delay systems can be changed under impulsive perturbations.
(ⅳ) We introduced the delayed impulses. Some interesting results on stability or ISS properties involving delayed impulse have been presented.
Although IDSs and their control theory have been developed for many years, there are still some shortcomings and problems to be solved:
(1) Many results on delayed impulses have been derived. However, most of them only considered the negative effect of time delay which exists in impulses. How to study the positive effect for such time delay is still a difficult problem.
(2) In recent years, the design and optimization of impulsive controller has been a hot and frontier problem for impulsive control theory, but there has been not much research progress in impulsive systems involving time delays. In particular, how to design an optimal impulsive controller under the constraints of engineering background is a key scientific problem that needs to be solved.
(3) Since impulsive control strategy usually has simple structure in which only discrete control are needed to achieve the desired performance, event-triggered impulsive control deserves increasing attention and some related control strategies have been proposed [93]. However, all the previous works have focused on the design of event-triggered impulsive control strategies for some specific systems, and there is no unified research method for general nonlinear systems, which leads to that the derived results have limitations in applications.
This work was supported by National Natural Science Foundation of China (11301308, 61673247, 11601269), and the Research Fund for Distinguished Young Scholars and Excellent Young Scholars of Shandong Province (JQ201719, ZR2016JL024). The paper has not been presented at any conference.
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