Earticle

디지털 복합기 제품은 민간 기업 및 국가공공기관에서 전산문서 생성, 저장 및 소통을 통해 업무의 효율성을 증대시키기 위한 방안으로 널리 사용되고 있다. 디지털 복합기 관련 국제그룹에서는 보안위협에 대응할 수 있는 보안 기능요구사항을 명세하고 보호프로파일 문서형태로 개발하는데 많은 노력을 기울이고 있다. 본 논문에서는 디지털 복 합기 제품 대상 국제사회에서 중요하게 인식되고 있는 보호프로파일들을 연구하고자 한다. 또한, 디지털 복합기 제품 에서 발생할 수 있는 보안위협 조사를 통해, 보안기능요구사항을 분석하고자 한다. 마지막으로 최근 보호프로파일 개 발 동향 연구를 통해 업체 측면에서 개발 시 반영해야할 핵심 보안기능요구사항 및 보안기능을 제시하고자 한다.

Digital multifunction Printers has been mainly used to enhance the work efficiency through generation, storage and communication of electronic documents at private company and public sectors. International groups regarding to digital multifunction printers have been putting a great effort to specify security functional requirements against security threats and have been developing protection profiles for them. In this paper, we study on protection profiles about digital multifunction printers which have been importantly recognized in the international society. In addition, we analyze security functional requirements by surveying security threats targeted for digital multifunction printers. Lastly, we propose essential security functional requirements and security functions that should be reflected in the products for the vendors by analyzing the recent development trends of related protection profiles.

본 논문에서는 공통평가기준 기반 보호프로파일의 보안기능요구사항 개발 방법을 침입탐지시스템 보호프로파일 개발 과정을 중심으로 제시함으로써, IT 제품 및 시스템 보호프로파일 개발시 각 설정 단계별 세부적인 개발 방법에 관하여 논한다.

By analysing the development process of Intrusion Detection System Protection Profile, we suggest the development method of Security Functional Requirements of Common Criteria- based Protection Profile and discuss how the method satisfies the requirements of If product or system Protection Profile in the development process.

The launcher of a hard-kill type APS (Active Protection System) requires rapid and precise driving to aim at incoming threats after detection. High angular acceleration is necessary for rapid driving, which demands high energy consumption. However, the capacity of the capacitor bank and power supply unit is limited due to weight and space constraints. If energy becomes insufficient during continuous operation, the voltage of the capacitor bank can drop below the minimum operating voltage of the drive motor, leading to problems such as torque deficiency. Therefore, it is necessary to determine an allowable angular acceleration that satisfies precision within the available energy and generate a driving profile accordingly. This paper proposes a method for deriving an allowable angular acceleration by analyzing the allowable energy and validates it through simulation. We examined the allowable energy by verifying the charged voltage of the capacitor bank, formulated equations for energy at the point of maximum consumption, and derived an equation for allowable angular acceleration through numerical analysis. By applying the proposed algorithm in simulations, we confirmed that the voltage of the capacitor bank did not drop below the minimum operating voltage of the driving motor during three consecutive operations. Therefore, it is expected that the stability of the APS launcher can be improved by applying the proposed algorithm, and continuous operation with limited performance is anticipated to be possible.

The launcher of a hard-kill type APS (Active Protection System) requires rapid and precise driving to target approaching threats after detection. High angular acceleration is required for rapid driving, which requires high energy consumption. However, the sufficient energy storage of the APS is limited due to weight and space constraints. If energy is insufficient during driving, the charged voltage of the capacitor bank may drop below the minimum operating voltage of the drive motor, which may result in problems such as torque insufficiency or saturation of the controller's integrator. Therefore, it is necessary to determine the maximum angular acceleration possible within the available energy and generate a corresponding driving profile. This paper proposes a method for calculating allowable energy and deriving allowable maximum angular acceleration for driving profile, and validates the proposed method through experiments. We established and implemented a method for deriving maximum angular acceleration through experimental methods to account for unknown frictional forces and mechanical errors in the launcher. By applying the proposed method, we confirmed that the system can operate at high speeds stably by reflecting appropriate angular acceleration even during continuous operation. Therefore, it is expected that the application of the proposed method will improve the operating stability of the APS launcher and enable continuous operation at maximum speed within limited energy.