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This study applied the ISO/IEC 25023 quality model to a public water information system and analyzed its quality management strategies and improvement effects. As a public infrastructure directly related to citizen safety, the system requires high availability, reliability, security, and usability. The eight quality characteristics of ISO/IEC 25023 were mapped across the system lifecycle—from requirements and design to implementation and operation—using open-source tools such as SonarQube and JMeter for verification. As a result, data recovery time was reduced from 17 to 4 minutes, backup time from 36 to 2 minutes, and database standardization rate improved from 22% to 99%. Qualitative improvements were also achieved through user-centered UI/UX redesign and automated code quality analysis. The study demonstrates that ISO/IEC 25023 can serve not only as an evaluation model but also as a strategic quality assurance process (Plan, Do, Check, Act), providing a sustainable framework for quality management in public information systems and a reference model for similar applications.

Social welfare centers in permanent rental apartment complexes shall be established in accordance with the regulations on the establishment of childcare center for residents. However, due to the increasing number of elderly and disabled households within the complex, it is difficult to recruit children to use the daycare center within the apartment complex, and the negative image of permanent rental apartments makes it difficult to recruit new children from outside the apartment complex. Accordingly, some of the childcare centers operated by the social welfare center in the permanent rental apartment complex are closed or closed. However, it is not possible to properly utilize the closed childcare center space due to the lack of consultation with the competent ward and county, including the review of related laws and regulations. In this study, we would like to propose a plan on how to utilize the idle space of closed childcare centers through a review of the social welfare center space in the permanent rental apartment complex, the operation status of daycare centers, and related laws. As a result of the study, it was found that when changing the use of childcare centers, it is necessary to reflect the needs of residents and discuss with building owners and public institutions in social welfare centers.

The rapid advancement of large language models (LLMs) has highlighted the Model Context Protocol (MCP) as a new standard for tool integration. However, security vulnerability research in MCP environments remains insufficient. This study presents one of the first experimental applications of fuzzing in MCP environments, targeting two representative modules: a SQLite-based query engine and a file system (FS) interface. To this end, customized fuzzing harnesses were developed to systematically generate diverse payloads, and performance metrics were collected over 30-minute experiments. The results indicate that the SQL-based server produced 77,758 test cases with greater payload diversity and longer average payload lengths, whereas the FS-based server produced 47,520 cases with shorter and simpler payloads. Notably, the response rate showed a clear disparity, with SQL fuzzing achieving approximately three times higher response success compared to FS fuzzing. These findings suggest that fuzzing characteristics and security robustness vary significantly depending on the target tool type within MCP environments. Overall, this study provides an early systematic evaluation of fuzzing-based vulnerability detection in MCP environments, offering foundational insights to strengthen the security of MCP-based applications.