• Journal of information and communication convergence engineering
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• v.3 no.1
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• pp.28-32
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• 2005

In this paper, we propose a novel test method to effectively detect hard and soft faults in CMOS 2-stage op-amps. The proposed method uses a very high frequency sinusoidal signal that exceeds unit gain bandwidth to maximize the fault effects. Since the proposed test method doesn't require any complex algorithms to generate the test pattern and uses only a single test pattern to detect all target faults, therefore test costs can be much reduced. The area overhead is also very small because the CUT is converted to a unit gain amplifier. Using HSPICE simulation, the results indicated a high degree of fault coverage for hard and soft faults in CMOS 2-stage op-amps. To verify this proposed method, we fabricated a CMOS op-amp that contained various short and open faults through the Hyundai 0.65-um 2-poly 2-metal CMOS process. Experimental results for the fabricated chip have shown that the proposed test method can effectively detect hard and soft faults in CMOS op-amps.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.666-669
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• 2009

임베디드 시스템의 Black-Box 테스트 자동화를 위해 Test Script 기반으로 테스트를 진행하고 있는 툴이 많이 있다. Test Script 에 기술되어 있는 입력 값을 임베디드 시스템의 실제 신호로 생성하고 또 Test Script에 기술된 출력 예상 값을 검증하기 위해 임베디드 시스템의 출력 신호를 읽어 들이기 위해서 일반적으로 DAQ Board를 사용한다. 이 때 다양 한 DAQ Board 또는 다른 장치를 제어하기 Service 라는 레이어를 두어 다양한 장치에 상응하는 프로그램을 만들 수 있도록 하였다. 본 논문에서는 Test Script 실행에 있어 실시간 성을 최대한 보장하기 위해 각 Service 의 실행시간을 최소화 하는 방법에 대해 논하고자 한다. 논의를 하는데 있어 다양한 Service 중 NIDAQ Board를 이용하여 신호를 생성하고 읽어 들이는 Service가 모든 테스트에 있어 일반적으로 사용하게 되는 Service 이기에 이를 기준으로 Service의 실행 시간을 최소화 하는 방법을 구현 하였다.

• Smart Media Journal
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• v.13 no.2
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• pp.85-94
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• 2024

Artificial Intelligence of Things (AIoT), which combines AI and the Internet of Things (IoT), has recently gained popularity. Deep neural networks (DNNs) have achieved great success in many applications. Deploying complex AI models on embedded boards, nevertheless, may be challenging due to computational limitations or intelligent model complexity. This paper focuses on an AIoT-based system for smart sewing automation using edge devices. Our technique included developing a detection model and a decision tree for a sufficient testing scenario. YOLOv5 set the stage for our defective sewing stitches detection model, to detect anomalies and classify the sewing patterns. According to the experimental testing, the proposed approach achieved a perfect score with accuracy and F1score of 1.0, False Positive Rate (FPR), False Negative Rate (FNR) of 0, and a speed of 0.07 seconds with file size 2.43MB.

• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.1117-1120
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• 1998

BIST architecture and circuit design are presented for the self-test of various datapath megacells including embedded SRAM, barrel shifter, adder and multiplier. The BIST architecture is composed of VCO, ROM, comparator and otehr control logic to measure the megacell' performance up to 300MHz. PC interface and control logic are also implemented to perform the manual testing of each megacell with various test patterns. The control logic was designed using VHDL and its circuit is synthesized using Synopsys for $0.6\mu$ 1-poly, 3-matal CMOS technology.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06b
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• pp.119-123
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• 2008

본 논문에서는 요구사항 기반 신뢰성 자동 테스트를 하기 위해서 테스트 수행기를 구현하고, 테스트 수행기 내부의 스케줄링 방법을 제안하였다. 제안한 방법으로 상용 FATC를 테스트한 결과 이산적으로 모델링할 수 있는 임베디드 시스템에서는 잘 동작함을 확인할 수 있었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.176-179
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• 2007

임베디드 시스템들은 빠르게 다양한 분야에 적용되고 있다. 이들 시스템들의 품질을 좌우하는 것은 소프트웨어이며, 제품 출시 시기와 제품의 품질 등에 매우 중요한 요소가 된다. 임베디드 소프트웨어 테스팅은 이러한 임베디드 소프트웨어에서 오류가 없음을 증명하는 것으로 전체 소프트웨어 개발에서 많은 부분을 차지한다. 임베디드 소프트웨어 테스팅은 소프트웨어의 기능적 부분을 주로 평가하며, 사용자가 필요로 하는 품질에 대한 평가 부분은 미흡하다. 본 논문에서는 임베디드 소프트웨어 테스팅 도구를 이용하여 임베디드 소프트웨어의 품질을 평가할 수 있는 방법에 대해 연구한다.

• Journal of the Korean Society for Nondestructive Testing
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• v.20 no.4
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• pp.305-313
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• 2000

To determine detection capabilities of locating steel bars and delamination inside concrete, commercially available nondestructive testing (NDT) equipments have been tested. The equipments include two radar systems and two electromagnetic method systems. The inclusions are a 19 mm diameter steel bar and 50 mm thick delamination embedded at different cover depths from the surface of concrete specimens. For the steel bar, attempts were made to determine the size of the bars by changing the diameter of the bars. A sample result of measuring horizontal spacing between doubly reinforced bars is presented in this paper. Experimental results on various measurement cases are discussed. Application of numerical modeling technique for the simulation of radar measurements and improved output display of radar measurements are also presented.

• Journal of Institute of Control, Robotics and Systems
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• v.2 no.3
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• pp.236-241
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• 1996

This paper presents a new eddy current testing system for inspecting tubes of steam generator in nuclear power plant. The proposed system adopted embedded expert system concept to automate tasks of the inspection such as inspection planning and flaw signal interpretation, and integrated all the tasks into a client/server type computing architecture using database management system. Therefore, human factor errors occurred during inspection could be minimized and the inspection data could be transferred in real-time. As a result, we can increase the level of inspection confidence and the productivity of a personal inspector. A prototype of the proposed system has been developed for 5 years and the test operation has been performed in domestic nuclear power plants.

• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.4
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• pp.179-186
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• 2008

Probing inside of concrete structures is one of the important steps in assessing condition of the structure. For the assessment, electromagnetic induction method and electromagnetic wave method are currently applied to the measurement of cover depth, and the detection of reinforcement embedded in concrete. To determine detection capability of locating reinforcement embedded in concrete, commercially available nondestructive testing (NDT) equipments have been tested. The equipments include electromagnetic wave system and electromagnetic induction system. In the tests, nine concrete specimens which have the dimensions of 1,000mm(length))${\times}$300mm(width) with thickness varying from 125mm to 150mm are used. The reinforcement are located at 45, 60, 100mm depth from the concrete surface. Horizontal reinforcement spacing has been set over 100mm. From the outcome, it is shown that error is increased as the diameter of reinforcement enlarge in case of using electromagnetic induction method. In case of using electromagnetic wave method, the detection of reinforcement embedded in deep is good in the view of reliability because of using the relative permittivity on the real cover depth.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.43 no.10 s.352
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• pp.140-150
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• 2006

In this paper, we present a new hardware architecture for testing various cores embedded in SoC. The conventional solutions need much testing time since only one core is tested at single test period. To enhance this, S-TAM, a novel test architecture, and its controller which enable parallel testing of various cores are proposed. S-TAM supports bus sharing to broadcast testing and cores to be tested are selected by using it. In addition, S-TAM controller enables the effective SoC test by simultaneous controlling the various test cores which are based on the different test architectures like IEEE 1149.1 and IEEE 1500.