• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.272-279
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• 2007

Recently, train control system is adopting computer system replacing mechanical system and its software is taking more responsibility than ever. Train control system software is a safety-critical embedded software with realtime and high reliability requirements. In this paper, we propose a safety assessment method for the train control system software. We review characteristics of train control system software and analyze related international software safety standards to derive requirements for safety assessment. Testing tools used for embedded software are surveyed to find a feasible safety assessment architecture. The proposed safety assessment method is to use safety activity results generated during development processes and feed them to the runtime embedded software testing tool.

• Journal of Information Processing Systems
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• 제11권1호
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• pp.104-115
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• 2015

Along with the evolution of Internet and its new emerging services, the quantity and impact of attacks have been continuously increasing. Currently, the technical capability to attack has tended to decrease. On the contrary, performances of hacking tools are evolving, growing, simple, comprehensive, and accessible to the public. In this work, network penetration testing and auditing of the Redhat operating system (OS) are highlighted as one of the most popular OS for Internet applications. Some types of attacks are from a different side and new attack method have been attempted, such as: scanning for reconnaissance, guessing the password, gaining privileged access, and flooding the victim machine to decrease availability. Some analyses in network auditing and forensic from victim server are also presented in this paper. Our proposed system aims confirmed as hackable or not and we expect for it to be used as a reference for practitioners to protect their systems from cyber-attacks.

• Toxicological Research
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• 제32권1호
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• pp.5-8
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• 2016

Risk assessment is the process of quantifying the probability of a harmful effect to individuals or populations from human activities. Mechanistic approaches to risk assessment have been generally referred to as systems toxicology. Systems toxicology makes use of advanced analytical and computational tools to integrate classical toxicology and quantitative analysis of large networks of molecular and functional changes occurring across multiple levels of biological organization. Three presentations including two case studies involving both in vitro and in vivo approaches described the current state of systems toxicology and the potential for its future application in chemical risk assessment.

• 비파괴검사학회지
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• 제36권2호
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• pp.102-111
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• 2016

This study develops an efficient and accurate method for calculating nonlinear diffraction beam fields propagating in fluids or solids. The Westervelt equation and quasilinear theory, from which the integral solutions for the fundamental and second harmonics can be obtained, are first considered. A computationally efficient method is then developed using a multi-Gaussian beam (MGB) model that easily separates the diffraction effects from the plane wave solution. The MGB models provide accurate beam fields when compared with the integral solutions for a number of transmitter-receiver geometries. These models can also serve as fast, powerful modeling tools for many nonlinear acoustics applications, especially in making diffraction corrections for the nonlinearity parameter determination, because of their computational efficiency and accuracy.

• Steel and Composite Structures
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• 제51권2호
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• pp.127-138
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• 2024

In this paper, structural behavior under fire conditions is comprehensively examined, and a novel software interface for testing interfaces efficiently is developed and validated. In order to accurately assess the response of structures to fire scenarios, advanced simulation techniques and modeling approaches are incorporated into the study. This interface enables accurate heat transfer analysis and thermo-mechanical simulations by integrating software tools such as CSI ETABS, CSI SAP2000, and OpenSees. Heat transfer models can be automatically generated, simulation outputs processed, and structural responses interpreted under a variety of fire scenarios using the proposed technique. As a result of rigorous testing and validation against established methods, including Cardington tests on scales and hybrid simulation approaches, the software interface has been proven to be effective and accurate. The analysis process is streamlined by this interface, providing engineers and researchers with a robust tool for assessing structural performance under fire conditions.

• 산업공학
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• 제25권1호
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• pp.134-141
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• 2012

The steering gear box for mid-heavy duty electric vehicles are usually produced by only a few specialized companies. The special techniques, such as designing, producing and testing technology have been veiled. For this reason, steering gear boxes are imported from other country. The durability test with the electric vehicle which is satisfies the design parameters takes several years, and a prototype is installed in the real vehicle for the test. In this research, the steering gear box of the steering system was developed based on the reverse engineering and the testing methods and the steering gear box development process have been suggested. The prototype is also developed with the CAD and CAE tools. Developed steering gear box have been tested in torque tester and have satisfied requied torque. As a result, the process and testing methods studied in this research are useful in the development processes of electric vehicles steering system.

• 대한기계학회논문집A
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• 제33권9호
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• pp.982-989
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• 2009

Parallel Kinematic Mechanism (PKM) is a device to perform the various motion in three-dimensional space and it calls for six degree of freedom. For example, Parallel Kinematic Mechanism is applied to machine tools, medical equipments, MEMS, virtual reality devices and flight motion simulators. Recently, many companies have tried to develop new Parallel Kinematic Mechanism in order to improve the cycle time and the precisional tolerance. Parallel Kinematic Mechanism uses general universal joint and spherical joint, but such joints have accumulated tolerance problems. Therefore, it causes position control problem and dramatically life time reduction. This paper focused on the rolling element to improve sliding precision in new sliding ball joint development. Before the final design and production, it was confirmed that new sliding ball joint held a higher load and a good geometrical structure. FEM analysis showed a favorable agreement with tensile and compressive testing results by universal testing machine. In conclusions, a new sliding ball joint has been developed to solve a problem of accumulated tolerance and verified using tensile and compressive testing as well as FEM analysis.

• 한국자동차공학회논문집
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• 제25권3호
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• pp.344-349
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• 2017

Suspension noise from under a passenger car is one of the important factors that impact the perceptual quality for drivers. However, it is difficult to validate this by component level testing in the early stage of development, because suspension noise caused by interaction of the related parts has been found at saleable vehicles late during development or at the manufacturing stage, when many customers have already filed for claims. This study proposed a validation testing under research by the DFSS process that enables reproduction of vehicle level noise by component level testing using a shock absorber with the related parts, such as urethane bumper and top mount. This study also developed a compromised test matrix while analyzing the noise factors through experimental design and analysis of variance to determine what factors can affect noise. Based on this study, we expect that the vehicle level and customer claim can be validated during initial development timing by a more reliable component noise validation test.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권5호
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• pp.581-585
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• 2010

최근 들어 소프트웨어의 복잡도와 규모의 증가와 함께 테스트의 중요성 또한 증대되고 있다. 테스트는 QA(Quality Assurance) 기간에 한정되지 않고 개발 기간에 꾸준히 적용 되어 자주 수행될수록 높은 품질 향상을 기대할 수 있다. 하지만, 지금까지 대다수의 테스트는 QA과정에 국한 되어 반복적이고 비 능률적인 매뉴얼 테스트 방법을 위주로 진행 되고 있다. 이는 코드 변경에 대해 효과적으로 회귀 테스트(Regression Test)를 수행할 수 없음을 의미하며 결과적으로 테스트를 자주 수행할수록 비용이 급격하게 증가하는 문제점을 가지고 있다. 본 논문에서는 이러한 문제점을 극복하기 위한 테스트 자동화 프레임워크(Framework)를 제안하고자 한다. 제안된 테스트 프레임워크는 테스트 테이블을 바탕으로 테스트를 가시적으로 설계할 수 있는 기능을 제공하며 스크립트 및 코드 작성을 최소화하여 적은 비용으로 빠른 시간 안에 테스트 자동화를 구현할 수 있도록 도와준다.

• 대한전자공학회논문지SD
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• 제38권10호
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• pp.746-753
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• 2001

본 논문에서 구현한 GenBIST는 메모리 테스팅을 위한 정보를 입력으로 받아 테스트용 회로를 VerilogHDL 코드로 자동 생성해 주는 설계 자동화 툴 이다. 상용 툴 들을 포함한 기존의 툴 들은 대부분 메모리 테스트를 위한 알고리즘들을 라이브러리화하고 이를 회로로 생성해주는 방식인데 반해, 본 논문에서 구현한 툴은 사용자가 정의한 알고리즘대로 회로를 생성해 줌으로써 새로운 알고리즘의 적용을 용이하게 하였다. 또한 다중 메모리를 지원할 수 있게 함으로써 메모리 BIST 회로를 공유할 수 있게 하였고 serial interfaceing 기법을 사용함으로써 경계 주사 기법과 함께 사용될 경우 메모리 테스트를 위한 부가적인 핀을 필요로 않는다.