Design of College Students’ Career Planning Guidance System Based On B/S Three-Tier Architecture

At present, the guidance mode of college students’ career planning guidance system is imperfect, resulting in too long submission time. A college students’ career planning guidance system based on B/S three-tier architecture is designed. Hardware part: on the basis of obtaining the sensor dynamic compensation filter, expand 6 static memory; Software part: obtain the influencing factors of College Students’ career planning, combined with the external environment, use the B/S three-tier architecture to set the guidance mode, formulate the links of career planning, adopt the hierarchical management mode, and design the role authority management function of the system. Experimental results: the average submission time of the college students’ career planning guidance system designed this time and the other two systems is 11.277s, 16.253s and 15.554s, which proves that the college students’ career planning guidance system integrating the B/S three-tier architecture has a better effect.


Sensor
Conditioning circuit

Figure 1. Overall System Hardware Architecture
As can be seen from Figure 1, the system is mainly composed of TMS320F2812 minimum system, front-end amplification and filtering module, external expansion memory module, USB interface module and so on. The minimum system of TMS320F2812 is mainly composed of TMS320F2812 chip, power conversion chip and external crystal oscillator. The power conversion chip is mainly composed of LP2987 and TPS76801, in which LP 2987 provides 3.3V power supply voltage for the system and TPS76801 provides 1.8V core voltage for the system. In order to avoid the design of external analog-to-digital conversion circuit, the system selects the ADC module inside TMS320F2812 to complete the analog-to-digital conversion function. In order to save the processed data in real time, the system expands two pieces of EM256J16 static memory with the capacity of 256Kx16bit. The communication between the system and the computer is mainly completed through the USB interface.
The chip controlling the USB interface communication here is FT245RL. the front-end conditioning circuit filters the sensor output signal and adjusts it to the acceptable range of ADC, and the digital signal is processed by dynamic compensation algorithm, The processing results are saved to the external expansion memory, and finally the data is transmitted back to the computer through the USB interface for display and analysisTMS320F2812 chip of the system mainly needs two voltages to supply power for it, one is the chip peripheral interface voltage of 3.3V, and the other is the chip core power supply of 1.8V. Here, the external power supply is an 8V battery, so it is necessary to convert 8V to 3.3V. Here, we select LP2987 to complete the work of 8V to 3.3V. With 3.3V voltage, we also need to convert it to 1.8V. Here, we select the conversion chip TPS7680 recommended by TI in the TMS320F2812 chip manual. Since all chips of the system except DSP chip are powered by 3.3 V, the above two power conversion chips can solve all power supply problems of the system. However, considering that there may be mutual interference between analog system and digital system, we separate analog power supply and digital power supply. In addition, in order to facilitate developers to carry out q-format calibration operation. Texas Instruments provides users with a very representative function library, which collects highly optimized and accurate mathematical function library for www.scholink.org/ojs/index.php/jecs Journal of Education and Culture Studies Vol. 5, No. 4, 2021 developers, and accurately converts floating-point algorithm into operation code of fixed-point algorithm on TMS320F2812 chip. These functions are often used in programs with intensive real-time calculation, and the running speed and accuracy are very important. In addition, using these function libraries can significantly shorten the application development cycle. Based on this, the hardware design steps of the system are completed.

Obtaining the Influencing Factors of College Students' Career Planning
The career of college students is plagued by many problems, including the choice of career path, whether they can achieve career success and career development (Huo, Q. S., Tan, H., Wu, N., et al., 2019;Bao, 2018). In the process of pursuing career development, individuals will be affected by a series of external social factors, mainly including educational background, family influence, personal needs and psychological motivation, external potential opportunities and changing social environment.
Everyone has his own unique talents, skills and abilities. In the current market economy environment with clear division of labor, everyone has one or some fields he is good at, but it is difficult to become all-round talents. Some people are suitable for marketing, while others are management talents, who are good at their own fields. Therefore, in this step, college students can make a list and list their favorite things and strengths in the where you are weak. Finding out your own shortcomings is as important as finding your own strengths, because you can make two different or even opposite choices according to your strengths and weaknesses. One is to face up to their own shortcomings, make unremitting efforts to change their common mistakes and make up for their own shortcomings, so as to effectively improve their skills and abilities in all aspects and meet professional requirements. The second is to give up the career choices related to the skills and abilities you are not good at. It can be seen that different choices get the opposite results. Therefore, it is necessary for individuals to list their own advantages and disadvantages that may have an adverse impact on their career choices when planning their career (Chen, 2021;Neneh, 2020;Li, 2019). The asymptotic coefficient of College Students' achievement is tested by chi square test. The calculation formula is: In formula (1), S represents the linear combination value, g represents the number of effective cases, m represents the expected count, and n represents the minimum expected count. Different industries and even different companies in the same industry will face different external opportunities and challenges. Therefore, if college graduates want to find a suitable job smoothly, they must clearly distinguish these external factors, because these external opportunities and challenges will affect the job choice of college graduates and the smooth development of their future career (Luo, 2019; Akos, Leonard, & Bugno, 2021). If a company is often in a passive external industry environment and is easily disturbed by various external adverse factors, there are problems in its own survival and development, let alone the choice of employment opportunities that can be provided, and the hope of career promotion is even more slim. In this step, college students can choose one or two industries they are interested in according to their own preferences and characteristics, and then carefully evaluate the current opportunities and potential challenges of these industries. The whole college students' career planning system is an organic and unified whole. We can clearly find that internal and external environmental factors affect college students' career planning. By analyzing various strengths, weaknesses, opportunities and challenges, we can formulate different strategic models. The career planning of college students using the output of the system is not complete. It should also be combined with various complex external environments, such as the current national policy-making and the demand standards of employers, and timely and appropriately reassessed or reasonably adjusted. Based on this, complete the steps to obtain the influencing factors of College Students' career planning.

B/S Three-tier Architecture Setting Guidance Mode
The B/S system decomposes the server part in the initial C/S mode and reconstructs it according to the needs of modern office (Wu, 2019). Its advantages are: the operating system does not need too high professional skills, the operation interface is simple, the maintenance of the system becomes easier, it is suitable for publishing information on the Internet, and the client does not need to install programs. On the whole, the high group of career planning accounts for a minority, indicating that although most students are aware of the importance of career planning, few make clear career planning. The majority of college students are grouped in career planning, which shows that most college students have a certain career planning, but it has not reached a clear level. There are many reasons for this result: the current social employment situation is very severe. Most college students can't find a job, but can't find an ideal job. Enterprises are not simply saturated with personnel, but encounter the flow of talents and the difficulty of finding real "talents", which has led the whole society, especially educational institutions, to pay more attention to college students' career planning from simply paying attention to college students' mental health, so as to improve their mental health. The low grouping of career planning accounts for a minority, indicating that only a few college students do not consider career planning in the current severe employment situation. Therefore, it is necessary to study the dynamic In formula (2), q represents the system order,  represents the transfer coefficient, c represents the structural parameters, j represents the output and i represents the input. The differential equation expression formula of the first-order sensor in the system is: In formula (3) The analysis of professional environment is based on social practice, which is included in the development of society and the change of professional requirements. Therefore, whether college students' career planning can be carried out smoothly is based on scientific environmental analysis and self cognition. The analysis of the environment will produce two completely different results. One is to analyze and find problems, timely adjust and seize opportunities, and finally achieve the established goals. The second is to analyze the improper combination of their own advantages, and there is no solution. Finally, it is not conducive to the implementation of career planning. Based on this, complete the steps of setting the guidance mode.

Designing System Role Permission Management Function
Requirements analysis is one of the most important steps in the development of data and information management system. Developers must fully understand the needs of customers before they can well design and develop a system that meets the needs of customers. Users need to provide developers with software requirements specifications. There are great differences in career planning and guidance in colleges and universities due to different specific conditions. Taking the career planning guidance of a university as the research object, this paper analyzes the actual operation steps of the career planning guidance of each level college, which is the main responsible unit of career planning guidance, and obtains the needs of college students' career planning guidance system. The college needs to reasonably refine and adjust the career planning guidance standards according to the current situation and situation www.scholink.org/ojs/index.php/jecs Journal of Education and Culture Studies Vol. 5, No. 4, 2021 of the college, the college's career planning guidance documents and the college's own characteristics.
Role is an abstract layer designed for system security. Although a role is not a real entity, members in the same role have the same module operation permissions, and roles can be created and deleted arbitrarily according to specific needs. Members of roles can be combined arbitrarily without restrictions. Members of roles are users of the system. Role access control management includes role management, user management and module management. Hierarchical authority management is realized through hierarchical management. Access to the module is obtained through the access permission of the role to the module. For a stable linear system with constant coefficients, Fourier transform can be used instead of Laplace transform. The specific expression formula is: In formula (4),  represents the frequency response times of the sensor, k represents the amplitude frequency characteristics of the sensor, and v represents the phase frequency characteristics of the sensor. Based on formula (4), the transfer function of the first-order sensor system is obtained after Laplace transform. The calculation formula is: simpler. The rationality of user authority design is the basis to ensure the normal operation of the system, give full play to the maximum efficiency and security. Because some communication contents have certain personal privacy and considerable confidentiality to outsiders, users must register for future reference. After the user is registered, the corresponding permissions can be assigned according to the authorization of the system administrator. The system administrator has the highest authority in the system. He can not only assign authority to other users, but also manage data and modules of the system. Ordinary users and super users can browse some data of the system, but they have no right to modify the restricted data. Based on the above description, complete the steps of designing the role permission management function of the system.

Build an Experimental Environment
In order to verify the effectiveness of the designed system, experimental tests are carried out. The database adopts Microsoft SQLSERVER large database to manage relevant data. The radio frequency transceiver chip CC2520 works in the 2.4GHz frequency band and the circuit works in the high frequency band. It is designed as a PCB separately and connected with the main circuit through a 14 pin socket, which can avoid the interference of the main circuit and the interference to the main circuit.
When it needs to be applied to longer distance wireless communication, a RF power amplifier, such as CC2591, can be added to the front end of CC2520 RF transceiver to increase the transmission power and improve the communication distance. It can be applied to new occasions by adopting a compatible 14 pin interface, that is, replacing the RF module. The subject only needs a communication distance of hundreds of meters, CC2520 can meet the communication distance requirements of the subject without adding power amplifier. The signal routing from RF pin has distributed parameter effect. When the RF differential output is connected with the antenna of SMA connector with single terminal characteristic impedance of SOS2, it needs circuit conversion. During the design, reference is made to the official design of TI, 6 capacitors of discrete components are used to realize impedance matching and conversion, and PCB bending routing switch circuit is used for compensation. The experimental test is carried out in the above environment, and the experimental results are obtained.

Experimental Result
The college students' career planning guidance system based on SWOFT analysis and the college students' career planning guidance system based on WEB analysis are selected for experimental comparison with the designed system.  It can be seen from table 1 that the average submission time of the designed college students' career planning guidance system and the other two systems is 5.041s, 6.614s and 6.871s; It can be seen from

Conclusion
The college students' career planning guidance system designed in this paper, through the summary of relevant theories and the analysis of the leading role of correct life values education on career planning education, takes this as the basis to explore the problems and cause analysis in career planning education, and puts forward the research topic of college students' career education path. It aims to explore a more effective educational path with the characteristics of the times on the basis of learning from and optimizing the previous exploration path and combined with the development of the times.
Due to the limited research conditions, this paper does not conduct in-depth test on the compatibility of the system, and will continue to study this topic in the future.