• 비파괴검사학회지
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• 제12권4호
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• pp.32-39
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• 1993

Past, present and future of nondestructive testing and evaluation(NDT&E) activities in Korea are reviewed. The current status and future direction in NDT&E research and development are presented. The newly revised edition of Korean NDT personnel qualification system is described. Other activities such as NDT&E training programs, NDT field services, and professional societies and international cooperation are also summarized. Founded in 1980, the Korean Society for Nondestructive Testing is now the center of domestic activities in NDT&E as well as the gateway to the international cooperation.

• 한국군사과학기술학회지
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• 제8권4호
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• pp.77-84
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• 2005

In this research, usability testing techniques had been applied to currently operating Military Logistics System software, and the effects of improvements made were verified. Furthermore, this research aims to assist the army to execute their researches on usability testing in the future. Various usability testing techniques and guidelines presented in this paper will be easily adapted to the research environment of the army. Consequently, the results of this research would play an important role in future development and evaluation of the Military Logistics System software.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2001년도 제17회 학술발표회 논문초록집
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• pp.90-93
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• 2001

In the present work, ultrasonic testing method has been developed to evaluate adhesive layers in rocket motor case assembly for the reliability of the rocket. The main objective of the present work was to find debonding between steel and rubber layers. The relationship between adhesion ratio and reflected ultrasonic amplitude was calculated by considering reflection coefficient at the interface between steel and rubber layers. It was found that the higher amplitude of ultrasound is reflected for the debonding area, and shown good agreements with experimental results. The ultrasonic C-scan images offers good implements for the determination of debonding area. The nondestructive testing results were compared with the micrography of destruective testing. As results, ultrasonic testing could be utilized for the evaluation of adhesive layer in the rocket motor case assembly.

• International Journal of Stem Cells
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• 제17권2호
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• pp.182-193
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• 2024

To address the limitations of animal testing, scientific research is increasingly focused on developing alternative testing methods. These alternative tests utilize cells or tissues derived from animals or humans for in vitro testing, as well as artificial tissues and organoids. In western countries, animal testing for cosmetics has been banned, leading to the adoption of artificial skin for toxicity evaluation, such as skin corrosion and irritation assessments. Standard guidelines for skin organoid technology becomes necessary to ensure consistent data and evaluation in replacing animal testing with in vitro methods. These guidelines encompass aspects such as cell sourcing, culture techniques, quality requirements and assessment, storage and preservation, and organoid-based assays.

• Smart Structures and Systems
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• 제4권5호
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• pp.667-684
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• 2008

Numerous devices exist for reducing or eliminating seismic damage to structures. These include passive dampers, semi-active dampers, and active control devices. The performance of structural systems with these devices has often been evaluated using numerical simulations. Experiments on structural systems with these devices, particularly at large-scale, are lacking. This paper describes a real-time hybrid testing facility that has been developed at the Lehigh University NEES Equipment Site. The facility enables real-time large-scale experiments to be performed on structural systems with rate-dependent devices, thereby permitting a more complete evaluation of the seismic performance of the devices and their effectiveness in seismic hazard reduction. The hardware and integrated control architecture for hybrid testing developed at the facility are presented. An application involving the use of passive elastomeric dampers in a three story moment resisting frame subjected to earthquake ground motions is presented. The experiment focused on a test structure consisting of the damper and diagonal bracing, which was coupled to a nonlinear analytical model of the remaining part of the structure (i.e., the moment resisting frame). A tracking indictor is used to track the actuator ability to achieve the command displacement during a test, enabling the quality of the test results to be assessed. An extension of the testbed to the real-time hybrid testing of smart structures with semi-active dampers is described.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2005년도 춘계학술대회 논문집
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• pp.71-76
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• 2005

The defects evaluation of the interior and the surface would be considered as vital characteristics in predicting the total life span of the steel structure. More importantly, the understandings in the interior composite of welding zone and the notifications in the presence, the formation, and the positioning of the non-metallic inclusion are necessary as well, since there were signs of relatively high defect frequency presented in the welding zone. The ultrasonic testing is a highly recommended technique chosen from among other techniques because of variety of advantages in conducting the non-destructive testing for the welding zone. However, the ultrasonic testing had technical disadvantages referred as followings; the problems due to the couplant between the PZT and the specimen, the formations that were miniature and complex, the moving subject, and the high temperature surrounding the specimen. This research was conducted to resolve the technical disadvantages of the contact ultrasonic testing by studying the non-contact ultrasonic testing where the ultrasonic waves were transferred by the laser, and revealing the specimen defects at its interior part and its surface part. The ultimate goal of this research was to develop a non-destructive evaluation applying the laser manipulated ultrasonic method for the steel structure.

• 인터넷정보학회논문지
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• 제8권6호
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• pp.115-125
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• 2007

게임 소프트웨어는 국내외적으로 상당히 인기가 높아지면서 시장 가치가 높아지고 있다. 그러므로 게임 소프트웨어의 평가 모델을 연구하는 것은 상당히 중요하다. 소프트웨어 품질 평가의 대표적인 국제 표준 모델은 ISO/IEC 9126이라고 보여진다. 특히 게임 소프트웨어는 사용자와 개발자에 있어서 소프트웨어 품질이 상당히 중요하므로 국제 표준 모델을 준수한 평가 모델이 필요하다. 이 연구에서는 게임 소프트웨어의 품질을 객관적이고 정량적으로 평가하기 위해서 소프트웨어 품질평가 메트릭을 제시하였다. ISO/IEC 9126의 소프트웨어 품질 평가 국제 표준 문서를 기반으로 기능성, 신뢰성, 사용성, 효율성, 이식성, 유지보수성의 6가지 품질 특성이란 관점에서 게임 소프트웨어의 품질 평가 모델을 제시했다.

• KIEE International Transactions on Electrophysics and Applications
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• 제5C권4호
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• pp.145-151
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• 2005

The synthetic breaking test method was developed to evaluate the breaking performance of ultra high-voltage circuit breaker and made up of two independent circuits; current source circuit and voltage source circuit. In application of this test method, it is necessary to extend the arc of the test breaker. So, the new re-ignition system using VTGS (Vacuum Triggered Gap-Switch) was constructed to improve the efficiency and reliability of this test. In this re-ignition system, VTGS operates in high vacuum state of $5{\time}10^{17}$torr and control system consists of the triggering device and the air M-G (Motor-Generator). This re-ignition system showed the operating characteristics, such as delay time ($t_d$) and jitter time ($t_j$ not exceeding 5us and 1us respectively, and had the operating voltage of $25\~150kVdc$ at the gap distance of 24mm.

• 비파괴검사학회지
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• 제23권4호
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• pp.380-387
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• 2003

• 비파괴검사학회지
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• 제33권4호
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• pp.388-393
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• 2013