Discussion on Tourism Logistics Based on the Separation and Combination of Tourists and Items Theory

In order to understand the essence of tourism logistics activities, the author studies and summarizes the existing research results of tourism logistics at home and abroad, finding that there exist two kinds of logistics phenomena in tourism industry. Then, the author analyses in-depth the cross process between the two kinds of logistics phenomena and tourist flow from the perspective of time and space as well as identifies the key factors in the process of their separation and combination. Next, focusing on the two kinds of logistics phenomena, the author completely explains the process of the tourism logistics activities via the in-out transformation mechanism. Finally, the functions and objectives of the tourism logistics system are defined through the separation and combination of tourists and items theory in this paper, which provides instructive directions for future research.

nitions worthy for reference have been come up at home and abroad.
Kochadze T finds that the logistics is one of the main sources of profits for service providers in tourism industry. Through constantly optimizing the logistics management process and correctly planning, managing, manipulating information and actions, profits can be gained, customers' tourism process can be adjusted as well as the supporting, promoting and restrictive role played by logistics in tourism activities can be identified [1]. K Segestlija Z believes that the logistics system in tourist destinations includes five modules: order fulfillment, inventory management, warehousing and dispatching, packaging and reorganization and vehicle [2]. Mrnjavac E thinks that tourism logistics refers to the coordination and optimization of substances, personnel, information, energy, waste, knowledge and capital at the lowest possible cost from the perspective of time and space so as to provide high quality tourism service [3]. Ivanovic Z emphasizes the importance of researching tourist destinations as a whole and comes up with the logistics system of tourist destinations based on systematic science. The lower levels of the logistics system are operational function system, information function system and management function system, which can be further decomposed into functional subsystems, namely, critical business processes [4]. Muhcina S argues that internal logistics activities in the tourism supply chain refer to the process from raw material suppliers to the final consumers, involving procurement, operations, and some other parts which are similar to material transfer and supply chains and are formed by cooperations among different numbers of participants [5]. Piboonrungroj P, taking Thailand's cultural and creative tourism as an example, proposes five elements of tourism logistics management, including infrastructure, information, intelligence, identification and innovation and further points out that logistics management is essential and significant to support creative tourism activities, reduce costs and elevate tourists' satisfaction [6]. Bosun P holds the view that the rapid development of the Internet has changed the traditional logistics process, involving changes in logistics functions, which requires tourism enterprises to adapt to electronic logistics [7].
Many domestic scholars analyze the connation of tourism logistics from broad and narrow senses, roughly forming the following three categories of views. The first one analyses the connation of tourism logistics from the perspective of tourism flow. Based on Pearce [8] and McIntosh [9]'s research of tourism flow, Tang Shuntie and GuoLaixi [10] propose the "tourism logistics" for the first time to expand the connotation of tourism flow through their analysis of modern tourism flow system. They think that tourist flow is accompanied by tourism logistics, which means that due to the implementation of tourism activities, material flow is generated between tourist origins and tourist destinations. The second one studies the connation of tourism logistics from the perspective of interaction between tourism industry and logistics industry. Li Xiaodong [11] puts forward that tourism logistics mainly refers to a series of logistics activities of tourists in the process of tourism, including tourism transit, tourism resource supply and the adoption of related logistics technology to manage tourism vehicles and tourists. The last point about the connation of tourism logistics is established via using the method of comparative analysis. By comparing the similarities and differences between tourism and logistics, tourism industry and logistics industry, Ji Liangxin [12] thinks that tourism and logistics activities are customer-oriented and that the essence of tourism logistics is various logistics phenomena and relationships, specifically, the material flow caused by tourists in tourism activities from tourist origins to tourist destinations.
Considering the above three kinds of understandings of tourism logistics, the following two conclusions can be drawn. Firstly, the tourism logistics aims to provide better service for tourists and is a kind of logistics activities which are accompanied by the tourist flow. Narrowly, it refers to flow process of all tangible materials in tourism industry; broadly, it refers to the total of all phenomena and relationships that are associated with tourism activities and material flow.
The second conclusion is about the value of tourism logistics, which is reflected in enhancing the tourism experience of tourists, reducing the operation cost and improving the overall operational efficiency of tourism industry etc.
Although there exist different ideas of tourism logistics, it is inseparable from three tourism factors in tourism activities, namely, tourists, tourist destinations, tourism media. While tourists and tourism media play the leading roles in tourist activities, tourists and tourist destinations are the creators of tourism logistics. The three tourism factors define the border of economic activities, which includes tourists conduct tourism activities in pursuit of personal values and spiritual pleasure; tourism media carries out the activities of procurement, supply and sale etc to meet consumers' demands. But they focus on describing the dialectical relationship among themselves and don't mention the process of tourism logistics. So, in order to explain how tourism logistics is generated, the author studies the process of tourism logistics on the foundation of the three tourism factors.

Two Kinds of Logistics Phenomena in Tourism Industry
The three tourism factors define the border of economic activities in tourism industry, namely, on the basis of certain tourism resources, all the economic be- performed on the basis of the external activities, and thus become an important part of tourism activities. Whether it is the tourists' tourism activities, or economic preparations conducted by travel service providers, they always concentrate on and are fulfilled around "six elements"-"food, housing, transportation, travel, shopping and entertainment." The three tourism factors determine the main bodies of tourism activities with economic nature, which also cover tourists and travel service providers. On the one hand, tourists will carry objects and buy commodities with certain volume and weight in the initial departure and in the process of travel, including daily necessities, necessary equipments and specialties and so on. With the spatial displacement of the tourists, these items carry out the same spatial movement under the same time series. On the other hand, tourism service providers perform economic activities similar to traditional manufacturing, like production, processing, procurement and storage etc. to satisfy the current and future tourist needs for "six elements". During these economic activities, various types of logistics activities are involved. According to the essence of logistics, all flows of tangible materials are a kind of "logistics" phenomenon, so the logistics phenomena in the tourism industry include material flow generated by tourist flow and logistics activities generated by the economic preparatory work of tourism service providers.
In the traditional manufacturing fields, the important function of logistics research lies in the realization of the operational optimization of raw materials from mining, producing, processing, manufacturing to selling and recycling, which means that these economic activities are done with higher efficiency and lower cost. However, in addition to the economic logistics activities in tourism industry are similar to the manufacturing logistics; the existing material flow accompanied by tourists is also an objective fact. As the items carried by tourists on the way are subject to the objective conditions, so the items tourists can carry have the upper limit. These objects, on the one hand, make it difficult for tourists to buy more goods to meet the individual's economic pursuit. On the other hand, carrying too many items will become the burden of tourists, which can affect the freedom of travel, and be not conducive to tourists' spiritual enjoyment and travel experience. Objects that the tourists think have certain value and function in the journey and that make spatial movement with the spatial displacement of the tourists are called "in-transit items" in this paper, including tourists personal objects and commodities bought halfway. In order to distinguish the two kinds of logistics phenomena, this paper calls tourism commodities needed, provided and sold by tourism service providers as A items and calls tourists' belongs whose ownerships are possessed by tourists " " tourism commodities; " " tourism commodity flow; " " in-transit items; " " flow of in-transit items; "·" tourists; " " tourist flow; " " space-time segmentation line

Separation of B Items from Tourists
The B items constantly change in time and place along with the travel process of tourists, which causes burden to tourists in journey. On the one hand, some of the B items are the necessary stuff in the whole travel process to meet the basic needs and daily habits of tourists, so it is a completely infeasible approach to unilaterally cut or even restrict things carried by tourists; on the other hand, as we know, B items are the ones that tourists buy and consume when travelling around, but due to the fact that there is upper limit of a single person's carrying capacity and the actual carrying capacity of a single person can not be reduced, tourists' purchasing power can't be fully excavated. Therefore, whether from the perspective of the tourists' tourism experience, or from the perspective of the The key to solving the problem of B items is to find an effective way to separate the tourist flow from the B item flow based on the trend of the combination of the A item flow, the B item flow and the tourist flow. As shown in Figure 3,

In-Out Transformation Mechanism
Reviewing Figure 2 and based on the concepts of "in-transit items" and "outof-transit items" put forward in this paper, we can find: when we transform the A items that merger with the tourist flow into B items through the process α, its transformation form and flow characteristics are nearly the same as those of the process when out-of-transit items are transformed into in-transit items. Therefore, in the logistics process of A items, we can regard A items as the "intended out-of-transit items" that will be transformed into B "in-transit items", which is a special condition of "out-of-transit items". As a result, we build an interpretation system of tourism logistics from the perspective of "in-transit items" and "out-of-transit items", as shown in Figure 5.
Here in the picture, in order to make a clear explanation, this paper calls the process β, the transformation from "in-transit items" to "out-of-transit items" as "forward transformation"; the process β', the transformation from "out-of-transit items" to "in-transit items" as "reverse transformation".
And a more concrete interpretation of "Tourism Logistics": tourism logistics refers to the total logistics relationships and phenomena, including supporting  the realization of the transformation of the "in-transit items" from the "intended out-of-transit items" by the process α and satisfying the mutual transformation between "in-transit items" and "out-of-transit items". On this basis, from the perspective of the tourist flow path, the paper studies the logistics operation mechanism of the A items and B items in the tourism industry, that is, the operation mechanism of tourism logistics, as shown in Figure 6 and Figure 7.  time and space requirements of tourists, which changes the B items from the out-of-transit storage state into the out-of-transit delivery state. After the completion of the transfer of the out-of-transit items from the tourist origin to the tourist destination of D(2), the tourism logistics entity in the tourism destination D(2) will transform the B items from being delivered to being stored and waiting for tourists in the remaining time to take their things, so as to complete the backward transformation from out-of-transit to in-transit.
(2) In-out Transformation Process of A items Products provided by travel service providers in tourism industry, based on the six elements of tourists' demands, show the consumption characteristics of multi types, forms and functions. But A items generally refer to something with the economic nature and the entity shape, including consumables goods for travel, special tourism commodities, general goods etc.
In Figure 7, the tourism behaviors of large numbers of tourists happen orderly, which results in the formation of a large-scale tourist flow that can be shifted to the locations of the travel service providers with whom it can be directly linked with. In the above process, based on tourists' needs, the mechanism collects and processes valid information from the flow and then delivers the results to suppliers of A items.
Because the goods transfer takes certain time, the tourism product suppliers need to complete the process of evaluation and prediction in advance according to the information they get, so as to clearly guide and determine the working progress indexes of tourism enterprises in the next phase, and then finish the production and process of A items that are suitable for all kinds of tourist consumption, in other words, the intended out-of-transit items; on this basis and through the logistics distribution, A items are moved to the locations of the travel service providers in space who communicate directly with tourists, so as to allow the tourists to buy and consume A items in the locations of the tourist service providers, which refers to the reverse transformation of the in-transit items from the intended out-of-transit items.

Conclusions
Through the in-out transformation theory, this paper puts forward a new explanation for the tourism logistics of A and B Items, which, in essence, elaborates the specific process of when, where, and how "people"-tourists and "objects"-A and B items, to separate and combine. Therefore, from the perspective of the overall tourism activities, tourism logistics is a series of logistics activities to make tourists and objects freely separate and merge with each other. Then it comes to the conclusion that the basic function of the logistics operation is to complete the forward and reverse transformation between the in-transit items and the out-of-transit items (including the intended out-of-transit items); the basic goal of the operation of tourism logistics is to realize the free separation and combination of tourists and items.
Based on the above theoretical analysis, how to complete the overall function of the tourism logistics and achieve the overall goal of tourism logistics as well as find space nodes suitable for the practice to support the free "in-out transformation" between A and B Items and tourists, have become the top priority of the current tourism logistics research. In addition, under the realistic background of the trend of horizontal expansion of the logistics industry and the high penetration of service industry in the logistics industry, to find a way of resource integration that combines the development of tourism industry and logistics industry, is also an important task for tourism logistics. On this basis, the establishment of a sound tourism logistics operation mechanism is the core content to perform the tourism logistics practice.