WO2015178606A1

WO2015178606A1 - Movable asset management system

Info

Publication number: WO2015178606A1
Application number: PCT/KR2015/004665
Authority: WO
Inventors: 이정훈
Original assignee: 주식회사 씨앤테크
Priority date: 2014-05-22
Filing date: 2015-05-11
Publication date: 2015-11-26
Also published as: KR101492592B1

Abstract

The present invention relates to a movable asset management system and, more specifically, to a system for receiving and analyzing data on multiple sensors installed on movable assets and storing the status of the movable assets, thereby putting, into a database, multiple pieces of movable asset information possessed by the movable assets and/or, in case security rights to the movable assets have been established, movable asset security information, and managing the movable assets by using the database.

Description

Property management system

The present invention relates to a property management system, and more particularly, to receive and analyze the data of a plurality of sensors and a plurality of sensors installed in the property, and store the state of the property. When a security right is set, it relates to a system for making database of property security information and managing the property using the database.

Patent Literature 1 relates to a non-occupied collateral disclosure system using a RFID technology, which is based on an RFID tag attached to a property such as a mechanical device, inventory, etc., which is the subject of collateral, and a specific information area for specifying the property. , Information on registration date and registration number, information on the debtor (owner) of the property, information on the secured creditor of the property, information on the purpose and cause of the registration of the security on the property, information on the lifespan of the security bonds in the garden, and information on the duration of registration of the security on the property. Storage unit for recording the non-occupied collateral information having a; And an RF transmitter / receiver for extracting information recorded in the storage unit and transmitting the information recorded in the storage unit according to a predetermined RF signal received from the outside, and an RFID tag, an RFID reader / writer, and a non-occupied collateral information disclosure system using the same. .

That is, according to Patent Document 1, when a security right is set in a garden, the system provides an information disclosure system on collateral using RFID technology, and thus, the security system of the garden can be efficiently managed.

However, Patent Document 1 has the following problems.

First, there is no function to manage DB systematically by building a database.

Secondly, the data stored in the DB is compared with the data stored in the Dongsan Electronic Registration Server, and accordingly, there is no function to search for double registration.

Third, there is no function to warn the case when the garden is leaked to the outside or to compare and analyze the current state and history of the garden regularly.

Fourth, there is no function to evaluate the current state and past history of the garden, and then regularly compare and grade the management status of the garden and use it for the evaluation of the garden.

Fifthly, there is no function in the disposal of the property to present the information necessary for the transaction or to activate the market for trading the property such as shopping for buyers.

* Prior art literature *

(Patent Document 1) Korean Patent Registration No. 10-0620399 (2006.09.06)

The present invention has been proposed to solve the problems described above, by attaching (including the built-in, as described below) a mobile terminal having a plurality of sensors in the garden, the data stored in the mobile terminal to the center It is an object of the present invention to provide a property management system and method for efficiently managing a property by sending a database to a management server.

In order to achieve the object of the present invention as described above, and to perform the characteristic functions of the present invention described below, features of the present invention are as follows.

In a property management system having a property terminal,

The real estate subject to management, machinery, apparatus, inventory,

A mobile terminal having a plurality of sensors attached to the garden and configured to generate event information by detecting fluctuations in the garden and to transmit event information to a server through a wired / wireless communication unit;

Property information including information for identifying the property, location information of the property, identification information of the owner of the property, and information on the state of use of the property, and / or identification information of the debtor and the secured creditor when a security right is set in the garden; Information about the amount of the security right and the maximum amount of the security right, and when the security right is registered, the information on the property security including the cause of the registration, the date of registration, the duration of the registration, and the registration number is stored and a database thereof. A central management server for continuously storing event information transmitted from the personal terminal and managing stored data;

An asset management system is provided, including an operator terminal for checking a change state of the asset according to event information sent from the central management server.

Preferably, the property information and / or property security information stored in the DB is received from the property terminal, stores the received property information and / or property security information, and the stored property information and / or property security information The property management system is provided, further comprising: a property electronic registration unit for searching whether or not double registration for the same property.

Preferably, a mobile terminal for checking whether the garden is leaked from the location of the garden identified in the garden information stored in the DB; And according to the check of the mobile terminal, if the garden is leaked to the outside location information is sent to the central management server, the augmentation management server to inform the operator terminal, and periodically compare and analyze the current state and history of the garden In addition, a property management system is provided for displaying the results.

Preferably, a real estate management system is provided which examines the current state and historical history of the estate, regularly compares and analyzes the state of the estate, and uses the grade of the estate management state in general property evaluation and appraisal. .

Preferably, a property management system is provided that classifies and combines the property information and / or property security information on a predetermined basis based on the DB and provides information necessary for the transaction of the property.

The mobile terminal according to an embodiment of the present invention may further include a location detecting unit by GPS for continuously detecting the location of the terminal.

The mobile terminal according to an embodiment of the present invention may transmit the remaining amount information of its own battery to the operator terminal through the central management server.

The mobile terminal according to an embodiment of the present invention includes a control unit for controlling a first function of the terminal and provides a low power mobile terminal through the control unit.

Implementing low power is a key feature that can reduce maintenance costs by increasing the period of time it can be maintained without changing the power source when the mobile terminal operates on batteries.

Property management system according to the present invention having the above configuration and action,

By continuously monitoring the state of the garden, it is possible to observe the long-term signs of change in the garden and collect long-term data to manage the history of the garden, thereby calculating the appraisal of the garden and its current value. It has the effect of estimating more specifically, it is possible to maintain through the battery residual information, and to provide an economic benefit to reduce the maintenance cost by implementing low power.

1 is a block diagram showing a property management system using the AIDC technology according to the prior art.

2 is an overall configuration diagram of a property management system according to an embodiment of the present invention.

Figure 3 is a detailed configuration diagram showing a personal terminal in accordance with an embodiment of the present invention.

Figure 4 is a detailed configuration diagram showing a central management server according to an embodiment of the present invention in detail.

* Detailed description of the major symbols in the drawings *

1: Property Management System

20: AIDC terminal

30: mobile reader

100: DB construction system

110: control unit

120: communication unit

130: DB

140: display unit

150: input unit

210: Garden

220: mobile terminal

230: Central Management Server

240: operator terminal

250: communication network

260GPS

320: gyro sensor

330: vibration sensor

340: position tracking sensor

350: power sensor unit

360: communication unit

310: control unit

365: Log data storage

370: Battery remaining amount check

375: event generator

380: daily data setting unit

385: Period setting part

390: ROM

395: periodic response section

410: database information database

420: collateral information database

430: event information storage unit

440: operator terminal interface unit

450: server control unit

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. Like reference numerals in the drawings refer to the same or similar functions throughout the several aspects.

1 is a block diagram showing a property management system 1 using the AIDC technology according to the prior art.

AIDC means Automatic Identification and Data Capture and is referred to as "AIDC".

The property management system 1 using the AIDC technology according to the related art includes an AIDC terminal 20, a mobile reader 30, and a DB construction system 100 attached to the property 10.

The AIDC technology used in the prior art is a catch-all concept including an RFID tag and a two-dimensional bar code in mind, but also include a new AIDC means according to technology development. An expensive tag 10 may use an RFID tag, or even an active RFID tag with a GPS. When the cost is burdened, the desired purpose may be achieved by a two-dimensional bar code.

According to the related art, when attaching a radio frequency identification (RFID) device to an individual garden 10, the property security management system using the RFID system consisting of terminals, readers, tags, etc. of the 500Mhz, 900Mhz, 2.45Ghz band and its It provides an operation method, and when applying a two-dimensional bar code, an AIDC system is composed of a terminal and a reader.

The AIDC terminal 20 is attached to the garden 10 and stores the garden information including information for identifying the garden 10, the location information of the garden, identification information of the owner of the garden and information about the state of use of the garden, etc. Then, the property information is transmitted to the outside.

In addition, the AIDC terminal 20, when the security right is set in the property 10, the identification information of the debtor and the security right, information about the amount of the security rights and the maximum amount of the security right, the cause of registration, the date of registration, the date of registration when the security right is registered It stores the property security information, including information on the period, registration registration number, etc., and transmits the property security information to the outside.

That is, according to the prior art, the AIDC terminal 20 transmits only the property information if the security right is not set in the garden 10, and if the security right is set, also transmits the property security information.

The mobile reader 30 receives the property information and / or the property security information transmitted by the AIDC terminal 20, and receives the received property information and / or the property security information through the network 40 of the DB construction system 100. It serves to transmit to the communication unit 120.

On the other hand, the DB building system 100 is configured to include a control unit 110, communication unit 120, DB 130, display unit 140, input unit 150.

The communicator 120 receives personal property information and / or personal security information from the mobile reader 30, the DB 130 stores personal property information and / or personal security information, and the control unit 110 is a mobile reader 30. It stores the property information and / or collateral security information received from the DB 130 and manages the stored DB (130).

The display unit 140 is connected to the control unit 110 to display the property information and / or collateral security information received by the communication unit 120 on the screen, the input unit 150 is connected to the control unit 110 to the DB 130 It serves to receive a signal from the user to extract and retrieve the stored property information and / or collateral security information.

As shown in FIG. 2, the property management system according to an embodiment of the present invention includes a property 210, a property terminal 220, a central management server 230, an operator terminal 240, and a communication network 250. And (GPS, 260).

First, the property 210 according to the present invention is a subject of management of the property management system according to the present invention, and means a machine, an apparatus, an inventory, and the like. The property receives a mortgage loan from a financial institution, the creditor, and in return, the debtor provides the financial institution with various information during the mortgage.

Next, the mobile terminal 220 according to the present invention is installed in the garden 210 serves to detect the signs of change in the garden. Here, the change sign means at least one or more of the movement, vibration, location and power usage and heat of the garden 210.

When the mobile terminal 220 detects a change indication, it stores and manages it as log data. The log data is stored for a predetermined period of time and then transmitted to the central management server 230 when event information is generated or during a periodic response.

For example, when the movement of the garden 210 occurs, the mobile terminal 220 detects it as a change indication and simultaneously tracks the location of the garden 210. In addition, when vibration of the garden 210 occurs, the mobile terminal 220 detects this as a change indication and simultaneously tracks the location of the garden 210.

In addition, when the location movement of the garden 210 occurs, the mobile terminal 220 detects this as a change indication, and simultaneously tracks the location of the garden 210.

In addition, if there is no power usage by checking the power usage of the garden 210, the mobile terminal 220 detects this as a change indication, and simultaneously performs the location tracking of the garden 210.

In addition, if there is heat generation in the garden 210, the mobile terminal 220 detects it as a change indication, and simultaneously tracks the location of the garden 210.

The sensing of heat is limited to the case that the garden 210 is a mechanical facility.

In this way, a plurality of jobs can detect signs of variation simultaneously or separately.

When it is detected as a change indication as described above, the mobile terminal 220 according to the present invention generates different event information according to the change indication.

In this case, the event information includes a generation value of the change indication and a change occurrence value with time since the generation of the occurrence value.

For example, the first occurrence value of the movement is generated in response to the movement change sign, and the event variation is generated periodically or in real time by generating the event information after the occurrence value is generated. .

In addition, the first occurrence value generated by the position movement is generated in the change indication of the position movement, and the event information is generated by checking the position movement variation occurrence value over time after generating the occurrence value periodically or in real time. .

The other factors generate the original occurrence value and the variation occurrence value in the same manner as in the above example.

Here, the at least one change indication of the movement, vibration, position and power usage of the garden 210 is detected using a plurality of detection sensors.

Therefore, the mobile terminal 220 according to the present invention includes a plurality of sensing sensor modules.

Next, the GPS (GPS) according to the present invention checks the location information of the garden 210 and checks the location information of the garden 210 among the change signs described above, and provides the same to the terminal 220. do.

Of course, according to the request of the mobile terminal 220 provides the location information of the garden 210.

In addition, the GPS 260 does not provide the location information to the personal terminal 220, but may provide the location information at the request of the central management server 230 or the operator terminal 240 to be described later.

As such, the GPS 260 according to the present invention may be usefully used for detecting a change in the signs according to the location information of the garden 210.

On the other hand, a change in the size of the movement and vibration of the garden 210 is detected, and the amount of each change is compared with the value set as the daily data.

If each change amount is larger than the value set for the daily data, event information is generated.

The daily data is set by determining the amount of change in the signs of change of the appropriate level occurring in daily life after collecting log data for several days after installation when the personal terminal 220 is installed.

In other words, the daily data corresponds to the amount of change in everyday signs of change that occurs in the garden.

When the change amount of the change indication is out of the daily data, the event information is generated by checking in real time.

The change indication of the present invention is detected by a plurality of sensors, which will be described in more detail with reference to FIG. 3.

Next, the GPS 260 provides the mobile terminal to determine the location of the mobile terminal when an event due to the change indication described above occurs.

The mobile terminal may have a location change, and when the location change occurs, provide the location information to the mobile terminal.

Next, the central management server 230 according to the present invention receives and manages the event information generated in the personal terminal 220 through the communication network 250, and serves to provide it to the operator terminal 240 to be described later do.

In addition, the magnitude of variation is determined by determining the magnitude of the variation indication variation according to the event information.

For example, if an event occurs continuously over time after the occurrence of an event according to the change sign, the change may vary depending on the number of occurrences of the event over a period of time, such as a very fluctuation, a slight fluctuation, a moderate fluctuation, a slight fluctuation, and a very fluctuation Can be given to varying degrees.

This degree of variation is also immediately provided to the operator terminal 240.

The central management server 230 is event information and / or the degree of risk generated in each of the movable terminal 220 when a plurality of managed assets 210, the terminal 220 and the operator terminal 240 is provided In order to provide each monitor terminal 240 to manage each unique identification information through each identification information can manage the mobile terminal 220 and the operator terminal 240 can transmit the corresponding data.

Since the use of such identification information is generally known, more detailed description thereof will be omitted.

Next, the operator terminal 240 according to the present invention serves to check the state of the property according to the event information and the degree of change sent from the central management server 230 through the communication network 250.

As such, if the event information and the degree of change are immediately checked without directly checking the change in the property, the history of the change or movement of the property can be directly managed, and the operation status of the property can be assessed to evaluate its value. Can be.

The communication network 250 according to the present invention is a wireless technology to smoothly exchange wireless data between the mobile terminal 220 and the central management server 230, between the central management server 230 and the operator terminal 240. This is the applied net.

The communication network 250 is preferably a wibro, 2G, or 3G mobile communication network. Therefore, the mobile terminal 220 and the operator terminal 240 connected through the central management server 230 will of course be provided with a wireless communication interface module capable of mobile communication.

It may also be a wired communication network instead of a wireless communication network. On the other hand, the monitor terminal 240 may be a PC or a mobile terminal or a mobile phone.

Referring to FIG. 3, the personal terminal 220 according to an embodiment of the present invention includes a gyro sensor unit 320, a vibration sensor unit 330, a location tracking sensor unit 340, a power sensor unit 350, and a controller. (310) communication unit 360, log data storage unit 365, battery remaining amount check unit 370, event generation unit 375, daily data setting unit 380, period setting unit 385, ROM 390, And a periodic response section 395.

In addition, it may further include a temperature sensor unit 355.

First, the gyro sensor unit 320 according to the present invention is a module for interfacing between the gyro sensor and the control unit 310, and measures the change in the garden using the gyro sensor. The gyro sensor senses the angular velocity, thereby measuring the movement of the garden 210. If the motion continues or changes in size from time to time, it can be seen that the garden 210 is moving. By detecting the change in angular velocity in the garden, the change in the garden is measured. When the angular velocity changes out of the daily data, event information is generated, and when the deviation from the daily data continues, the degree of change is given.

The vibration sensor unit 330 according to the present invention is a module for interfacing between the vibration sensor and the control unit 310, and measures the vibration generated in the garden 210 using the vibration sensor.

Vibration sensors are also referred to as sound sensors and acceleration sensors.

If the vibration continues or the size changes from time to time, it can be seen that the garden 210 is moving to another place.

By detecting the change in vibration in the garden, the change in the garden is measured. When the vibration changes out of the daily data, event information is generated, and when the deviation from the daily data continues, the degree of change is given.

Temperature sensor unit 355 according to the present invention is a module for interfacing between the temperature sensor and the controller 310, it is provided to check the temperature around the garden, it is possible to detect the environmental change by the temperature and the temperature change When the deviation from the daily data can be given a degree of variation.

The communication unit 360 according to the present invention is a module having an interface of wireless communication or wired communication to communicate with the central management server through a communication network.

The log data storage unit 365 according to the present invention collects and stores various types of data generated from the personal terminal 220.

The change of vibration and angular velocity is detected, and the amount of change is stored, and the remaining amount of battery is checked to store such data and the position by the position sensor.

The location tracking sensor unit 340 according to the present invention is a module that interfaces between the location tracking sensor of the mobile terminal 220 and the control unit 310, and provides the location information to the mobile terminal when the location of the mobile terminal changes. do.

Of course, the central management server may obtain the location information by requesting the location information from the personal terminal 220.

Such location information may be made through a GPS sensor in communication with a satellite, and thus a detailed description thereof will be omitted.

The battery residual amount checking unit 370 according to the present invention obtains a residual value from a circuit indicating a remaining battery level in the control unit 310 of the mobile terminal 220 and provides the same.

The mobile terminal 220 is operated by acquiring power through the battery, so it must operate at a low power and check the battery replacement time by checking the remaining amount of the battery.

The checked remaining amount information is transmitted to the operator terminal 240 through the central management server 230.

The operator then checks the status of the standby power source, which also perceives a change in status and takes appropriate action.

The event generating unit 375 according to the present invention is to detect the change in the vibration and angular velocity and contrast each change amount with the value set as the daily data and to generate event information when each change amount is larger than the value set as the daily data. do.

The daily data setting unit 380 according to the present invention attaches the mobile terminal 220 and accumulates the data of the gyro sensor unit and the vibration sensor unit for several days, and then analyzes the data to see the amount of change that appears daily. Define daily data and set daily data.

The amount of change below the set daily data is accumulated as log data, but is not treated as the amount of change enough to generate event information.

In the present invention, since the life of the battery can be extended only when aiming for low power, the communication unit is operated only when the event information occurs without the communication unit which uses a lot of battery in the daily data. I do not want to.

The daily data setting unit acquires the daily data input by the administrator and stores the daily data in the memory space of the mobile terminal.

The period setting unit 385 according to the present invention allows to set two cycles and a duration.

There are two cycles, the detection cycle and the sleep cycle. The duration sets the conditions under which event information can be generated.

The controller is activated according to the detection cycle and is not activated when the controller is sleeping according to the sleep cycle, thereby realizing low power.

The sensing cycle is not always operated 24 hours, but operates according to the sensing cycle, and sleeps when it is not.

Therefore, it is necessary to set the detection period and the sleep period.

In one embodiment, when the sensing period is set to 10 seconds and the sleep period is set to 20 seconds, the controller operates a sensor for sensing for 10 seconds and the sensor operation for sensing for 20 seconds is stopped.

In addition, in order to generate event information, how long the detection of abnormality of daily data lasts is important.

In one embodiment, if the duration is set to 20 seconds and the detection cycle is set to 10 seconds and the sleep period is set to 20 seconds, the control unit detects a change amount of more than the daily data for 10 seconds and after 20 seconds sleep, so that no vibration is detected. If the event information does not occur.

However, in the above case, if the control unit detects a change amount of abnormal data over 10 seconds and sleeps for 20 seconds and then detects a change amount of abnormal data over 10 seconds, event information is generated.

In other words, the event information is generated when the amount of change of the abnormal data is longer than 20 seconds.

In the present invention, a low power chip is used as another means for realizing low power.

Low-power chips are designed to use a hundredth of the power of ARM chips used in mobile phones.

In addition, the programming language used is a low-power chip designed to program in assembly, minimizing the time and steps it takes to run.

Usually ARM uses C language and JAVA, which is not suitable for low power as it has more steps than assembly.

As described above, the low-power program is stored in the ROM 390 to be executed by the controller 310.

The periodic response unit 395 according to the present invention periodically communicates with the real estate terminal 220 to the central management server 230 at regular intervals.

At this time, log data may be transmitted.

The reason why the periodic response part is necessary is that the mobile terminal 220 attached to the weak part of the bridge is damaged or the battery is rapidly discharged in preparation for communication. For example, if the period is set to 6 hours, every 6 hours Each time, the mobile terminal 220 simply communicates with the central management server 230 to inform that the terminal itself is currently operating normally.

If there is no response from the personal terminal 220 even after 6 hours, the central management server 230 notifies the operator terminal 240 to indicate that there is a change in the personal terminal 220 so that the operator may take appropriate measures. You can take it.

As shown in Figure 4, the central management server according to an embodiment of the present invention, the property information database unit 410, the property security information database unit 420, the event information storage unit 430, the operator terminal interface The unit 440 is configured to include a server control unit 450.

The property information database unit 410 according to the present invention is an interface module between the server control unit 350 and the property information database. The information for specifying the property, the location information of the property, the identification information of the property owner, and the usage state of the property are described. It obtains the property information including the information, and delivers it to the server control unit for storage in the property information database.

The secured property information database unit 420 according to the present invention is an interface module between the server control unit 350 and the secured property information database. When the secured right is set in the property, the identification information of the debtor and the secured creditor, the amount of the secured bond of the secured right, and its In order to obtain the property security information including information on the maximum amount, information on the cause of registration, the date of registration, the period of registration, the registration period, and the registration registration number, and to store the property security information in the database. To pass.

The event information storage unit 430 according to the present invention continuously stores the event information transmitted from the mobile terminal and stores the stored data as a module for managing the stored data. It will be used for appraisal and appraisal, and it will provide the information necessary for trading the property.

The operator terminal interface 440 according to the present invention transmits a change degree according to event information from the server controller 450 to the operator terminal so that the operator can recognize the state of the mobile terminal.

The server controller 450 according to the present invention controls the property information database unit 410, the property security information database unit 420, the event information storage unit 430, and the operator terminal interface unit 440. It is connected to a Dongsan electronic registration server (not shown) and compares the data stored in the DB with the data stored in the Dongsan electronic registration server, and accordingly has a function to search for double registration.

As described above, embodiments of the present invention have been described with reference to the accompanying drawings, but the embodiments described above are exemplary in all respects and are not intended to be limiting. Those skilled in the art to which the present invention pertains as described above may understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not restrictive.

The scope of the invention is indicated by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the invention. do.

The present invention relates to a property management system, which continuously monitors the state of the property, provides long-term observation of the changing symptoms of the property, collects data for a long time, and provides an effect of managing the history of the property. It has the effect of calculating the appraisal value of the company and calculating the current value of the property in more detail.It enables the maintenance through battery residual information, and realizes economic benefits to reduce the maintenance cost by implementing low power. It can be useful because it provides an effect.

Claims

In the property management system,

The real estate subject to management, machinery, apparatus, inventory,

A mobile terminal having a plurality of sensors attached to the garden and configured to generate event information by detecting fluctuations in the garden and to transmit event information to a server through a wired / wireless communication unit;

Property information including information for identifying the property, location information of the property, identification information of the owner of the property, and information on the state of use of the property, and / or identification information of the debtor and the secured creditor when a security right is set in the garden; Information about the amount of the security right and the maximum amount of the security right, and when the security right is registered, the information on the property security including the cause of the registration, the date of registration, the duration of the registration, and the registration number is stored and a database thereof. A central management server for continuously storing event information transmitted from the personal terminal and managing stored data;

And an operator terminal for checking a change in the property according to the event information sent from the central management server.

The personal terminal,

Gyro sensor unit 320;

Vibration sensor unit 330;

Position tracking sensor unit 340;

A power sensor unit 350; And

A controller 310 that is activated according to a detection cycle and is not activated when it is sleeping according to a sleep cycle;

A communication unit 360;

Log data storage unit 365;

Battery remaining amount check unit 370;

An event generator 375 for detecting the change in the vibration and the angular velocity and comparing each change amount with a value set as the daily data and generating event information when each change amount is larger than the value set as the daily data;

Set the amount of change in the signs of daily change that occur frequently in the garden and make the event information from the event generator only when the amount of change over the daily data lasts for a certain time so that the communication unit operates according to the event to prevent power consumption. Everyday data setting unit 380;

A period setting unit 385 for setting a detection period, a sleep period, and a duration time;

A ROM 390 for storing a low power program;

And a periodic response unit 395 for periodically and simply communicating with the central management server 230 at a predetermined cycle.

The central management server,

A property management system comprising a property information database unit 410, a property security information database unit 420, an event information storage unit 430, an operator terminal interface unit 440, and a server control unit 450. .