• The Journal of Korean Institute of Communications and Information Sciences
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• v.39B no.1
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• pp.1-7
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• 2014

This paper proposes an efficient test wrapper design that reduces overall test time in multi-core SoC. After initial local wrapper solution sets for all the cores are determined using well-known Combine algorithm, proposed algorithm selects a dominant core which consumes the longest test time in multi-core SoC. Then, the wrapper characteristics in the number of TAM wires and the test time for other cores are adjusted based on test time of the dominant core. For some specific cores, the number of TAM wires can be reduced by increasing its test time for design space exploration purposes. These modified wrapper characteristics are added to the previous wrapper solution set. By expanding previous local wrapper solution set to global wrapper solution set, overall test time for Multi-core SoC can be reduced by an efficient test scheduler. Effectiveness of the proposed wrapper is verified on ITC'02 benchmark circuits using $B^*$-tree based test scheduler. Our experimental results show that the test time is reduced by an average of 4.7% when compared to that of employing previous wrappers.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.6
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• pp.1191-1195
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• 2009

We present the efficient test wrapper design methodology considering the layout distance of scan chain. To test the scan chains in SoC, the scan chains must be assigned to external TAM(Test Access Mechanism) lines. The scan chains in IP were placed and routed without any timing violation at normal mode. However, in test mode, the scan chains have the additional layout distance after TAM line assignment, which can cause the timing violation of flip-flops in scan chains. This paper proposes a new test wrapper design considering layout distance of scan chains with timing violation free.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.869-872
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• 2005

In this paper we present a switch wrapper for an AMBA AXI, which is an efficient on-chip-network interface compared to bus-based interfaces in a multiprocessor SoC. The AXI uses an idea of NoC to provide the increasing demands on communication bandwidth within a single chip. A switch wrapper for AXI is located between a interconnection network and two IPs connecting them together. It carries out a mode of routing to interconnection network and executes protocol conversions to provide compatibility in IP reuse. A switch wrapper consists of a direct router, AHB-AXI converters, interface modules and a controller modules. We propose the design of a all-in-one type switch wrapper.

• Journal of Biosystems Engineering
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• v.27 no.3
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• pp.195-202
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• 2002

In order to make a winter cereal wrap silage, a tractor attached round bale wrapper was developed locally. Its specific structure and various functions were reported in the last submitted paper. In this study a control system of bale wrapper combining with the actuators of various processes was developed to make round bale wrapper compatible in the field. Also. its performance was tested by making the rye round bale. The results can be summarized as fellow. 1. The field capacity of round bale wrapping was investigated around 0.5 ha/hr, and the operating time of bale wrapper was about 3 min for each 500kg round bale 2. Plastic film which has maximum elongation rate of 796% was stretched to 150∼170% of original length and was lessened to 80∼90% of original width. 3. In the quality test of bale produced by developed bale wrapper, there was no significant changes of moisture contents if it was wrapped more than 4 layers of 25 ㎛-plastic film. 4. Also. temperature of the wrapped bale was about 33$\^{C}$ in the beginning of fermentation and was stabled to 26∼29$\^{C}$ during one month or more storage. Therefore, wrapping performance of the developed bale wrapper was properly.

• Journal of Digital Convergence
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• v.7 no.3
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• pp.113-122
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• 2009

The majority of programming education in the learning place attaches importance more to grammar, memorization of the imperative sentence and explanation of the program language itself than the specific way to use the target language. In addition, it is mainly used to teach theoretical knowledge based on the text. Consequently, current programming education has not interested learners in the programming learning and has not improved their ability in programming problems of the real world. We therefore developed a learning tool of C-language, which is based on the Console Wrapper. The purpose of proposing the learning tool was to make the programming education break from the typical theoretical learning and to let learners be interested in the programming education. By using the dynamic screen instead of the static console screen, the learners could enjoy learning the program. As a result of this study, we could know that the programming education using our learning tool is more effective than the typical C language programming education.

• Proceedings of the KAIS Fall Conference
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• 2008.05a
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• pp.189-191
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• 2008

본 논문에서는 스캔 체인의 레이아웃 거리를 고려한 효율적인 Test Wrapper 설계 방식을 제안한다. SoC내의 스캔체인들을 테스트 하기 위해서는 외부 TAM line에 각 스캔체인들을 할당해야 한다. IP 내에 존재하는 스캔체인들은 스캔체인간 레이아웃 거리를 갖게 되며 이 거리가 클럭주기를 넘어가는 경우 체인의 타이밍 위반(Timing violation)이 발생될 수 있다. 본 논문에서는 타이밍 위반이 발생하지 않도록 체인간 거리를 고려하여 스캔체인을 할당하는 새로운 test wrapper 설계 방식을 제안하였다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.44 no.11
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• pp.109-118
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• 2007

As the integration density and the operating speed of System on Chips (SoCs) become increasingly high, it is crucial to test delay defects on the SoCs. This paper introduces an enhanced IEEE 1500 wrapper cell architecture and IEEE 1149.1 TAP controller for the wrapper interface logic, and proposes a transition delay fault test method. The method proposed can detect slow-to-rise and slow-to-fall faults sequentially with low area overhead and short test time. and simultaneously test IEEE 1500 wrapped cores operating at different core clocks.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.45 no.2
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• pp.61-68
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• 2008

This paper introduces an embedded core test wrapper for AMBA based System-on-Chip(SoC) test. The proposed test wrapper is compatible with IEEE 1500 and can be controlled by ARM Test Interface Controller(TIC). We use IEEE 1500 wrapper boundary registers as temporal registers to load test results as well as test patterns and apply a modified scan test procedure. Test time is reduced by simultaneously performing primary input insertion and primary output observation as well as scan-in and scan-out.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.44-47
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• 2023

SYCL은 C++을 기반으로 하는 언어로 가속기를 사용하는 복잡한 과정을 C++의 특징 중의 하나인 추상화를 사용해 개발자가 쉽게 접근할 수 있게 한다. 그러나, 가속기를 활용하는 측면에서는 성능을 최대한으로 끌어내기 위해 저수준 접근도 필요하다. 특히, NVLink와 같이 효율적인 멀티-GPU 통신을 해주는 인터커넥션 링크 활용을 위해서도 필요하다. 본 논문에서는 SYCL 구현물 중의 하나인 AdaptiveCpp을 가지고 NVLink로 연동된 멀티 GPU 환경에서 효율적으로 프로그래밍을 할 수 있는 방법을 제안하고, SYCL 개발자들이 SYCL의 설계 철학을 따라 프로그래밍을 할 수 있도록 이러한 기능을 추상화하여 담은 MPI wrapper API를 제안한다.

• Food Science and Preservation
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• v.20 no.1
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• pp.7-13
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• 2013

Mushrooms have a shorter shelf-life than most vegetables because of their very high respiration rates, sensitivity to enzymatic browning and susceptibility to microbial spoilage. This study was conducted to investigate effects of various packaging materials and precooling on the quality of mushrooms (Agaricus bisporus). Mushrooms were precooled at $4^{\circ}C$ for three hours and packaged using the following packaging materials; 1) polyethylene (PE) film bags of 0.03 mm thickness, 2) polypropylene (PP) film bags of 0.03 mm thickness, and 3) polystyrene (PS) tray+polyvinyl chloride (PVC) wrapper. The physiological changes (weight loss, gas composition, color, firmness, and sensory evaluation) associated with postharvest deterioration were monitored for 17 days at $10^{\circ}C$. The results showed that the PP film bag maintained quality of mushrooms most effectively, especially PP film bags inhibited decreasing firmness. The samples also exhibited smaller decreases in weight loss rate (0.57%) and Hunter L value (84.44) than PS tray+PVC wrapper (7.73%, 82.19) and PE film bags (0.89%, 82.96). Sensory evaluation level in all samples remained relatively constant during the first 5 days of storage. However, PE film bags and PS tray+PVC wrapper showed lower score of flavor, texture and color than PP film bags after 8 days of storage. This study suggested that PP film bag packaging effectively extends shelf-life of mushrooms during storage.