• Title, Summary, Keyword: Self-repair

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Teacher's corrective feedback: Focus on initiations to self-repair (학습자의 오류에 대한 교사의 오류 수정: 학습자 자기 교정 유도를 중심으로)

  • Kim, Young-Eun
    • English Language & Literature Teaching
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    • v.13 no.1
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    • pp.111-131
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    • 2007
  • This study explores teacher's corrective feedback types in an error treatment sequence in Korean EFL classroom setting. Corrective feedback moves are coded as explicit correction, recast, or initiations to self-repair. The frequency and distribution of each corrective feedback type are examined. But the special focus was given on feedback types eliciting learner's self-repair (clarification request, metalinguistic feedback, elicitation, and repetition of error) because initiations to self-repair are believed to facilitate language learning more than other strategies. The results of the study are as follows. First, there was an overwhelming tendency for teacher to use recasts whereas initiations to self-repair were not used as much as recast (52.4% vs. 29.5%). Second, the teacher tended to select feedback types in accordance with error types: namely, recasts after phonological, lexical, and translation errors and initiations to self-repair after grammatical errors though the differences were not significant. Finally, teacher's belief and students' expectation on corrective feedback were compared with actual corrective feedback representations respectively and some mismatches were found. Though both teacher and the students acknowledged the importance and necessity of self-repair, self-repair were not put into practice as such. Therefore, this study suggests more initiations to self-repair be used for effective language learning.

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Dynamic Self-Repair Architectures for Defective Through-silicon Vias

  • Yang, Joon-Sung;Han, Tae Hee;Kobla, Darshan;Ju, Edward L.
    • ETRI Journal
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    • v.36 no.2
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    • pp.301-308
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    • 2014
  • Three-dimensional integration technology results in area savings, platform power savings, and an increase in performance. Through-silicon via (TSV) assembly and manufacturing processes can potentially introduce defects. This may result in increases in manufacturing and test costs and will cause a yield problem. To improve the yield, spare TSVs can be included to repair defective TSVs. This paper proposes a new built-in self-test feature to identify defective TSV channels. For defective TSVs, this paper also introduces dynamic self-repair architectures using code-based and hardware-mapping based repair.

Built-In Self Repair for Embedded NAND-Type Flash Memory (임베디드 NAND-형 플래시 메모리를 위한 Built-In Self Repair)

  • Kim, Tae Hwan;Chang, Hoon
    • KIPS Transactions on Computer and Communication Systems
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    • v.3 no.5
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    • pp.129-140
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    • 2014
  • BIST(Built-in self test) is to detect various faults of the existing memory and BIRA(Built-in redundancy analysis) is to repair detected faults by allotting spare. Also, BISR(Built-in self repair) which integrates BIST with BIRA, can enhance the whole memory's yield. However, the previous methods were suggested for RAM and are difficult to diagnose disturbance that is NAND-type flash memory's intrinsic fault when used for the NAND-type flash memory with different characteristics from RAM's memory structure. Therefore, this paper suggests a BISD(Built-in self diagnosis) to detect disturbance occurring in the NAND-type flash memory and to diagnose the location of fault, and BISR to repair faulty blocks.

Study on Damage Repair of Polymer Composites Using Self-Healing Technique (Self-healing Technique을 적용한 폴리머 복합재의 손상 보수 연구)

  • ;;M.R. Kessler;S.R. White
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.93-96
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    • 2001
  • Structural polymer composites are susceptible to damage in the form of cracks, which form deep within the structure where detection is difficult and repair is almost impossible. A recent methodology for the damage repair of polymer composites using the self-healing technique is reported. The polymerization of the healing agent is triggered by contact with an embedded catalyst, being necessary to damage repair of polymer composites. For this purpose, the self-healing concept is introduced and the manufacturing process of microcapsule with the healing agent is briefly described. The polymerization between the healing agent and the catalyst is verified by the use of ESEM and IR spectroscopy. Finally the efficiency of the self-healing technique is investigated by measuring the critical load of TDCB specimen.

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Second Language Classroom Discourse: The Roles of Teacher and Learners

  • Jung, Euen-Hyuk Sarah
    • English Language & Literature Teaching
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    • v.11 no.4
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    • pp.121-137
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    • 2005
  • The present study aims to examine how the roles of teacher and learners affect the repair patterns of both teacher's and learner's utterances in English as a second language (ESL) classroom discourse. The study analyzed beginning ESL classroom discourse and found that the structure of repair seems to be greatly influenced by the roles of participants in a second language classroom. The teacher's repair work was mainly characterized by self-repair. In contrast, learners' repair sequences were predominantly characterized by other-repair. More specifically, self-initiation by the learner of the trouble source was cooperatively completed by the teacher and the other learners. Other-initiated and other-completed repair was the most prevalent form in the current classroom data, which was carried out by the teacher in both modulated and unmodulated manners. When the trouble sources were mostly concerned with the learners' problems with linguistic competence and information presented in the textbook, other-repair took place in a modulated manner (i.e., recasting and prompting). On the other hand, when dealing with learners' errors with factual knowledge, other-repair was conducted in an unmodulated way (i.e., 'no' plus correction).

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Design of Built-In-Self-Repair Circuit for Embedded Memory Using 2-D Spare Memory (2차원 여분 메모리를 이용한 내장메모리의 자가치유회로 설계)

  • Choi, Ho-Yong;Seo, Jung-Il;Cha, Sang-Rok
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.44 no.12
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    • pp.54-60
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    • 2007
  • This paper proposes a built-in-self-repair (BISR) structure using 2-dimensional spare memory to effectively self-repair faults of an embedded memory. In case of multiple faults in the same row (column) of an embedded memory, the previous method using 1-D spare column (row) memory needs the same number of spare memory columns (rows) as the number of faults to self-repair them. while the new method using 2-D spare memory needs only one spare row (column) to self-repair them. Also, the virtual divided memory is adopted to be able to self-repair using not a full spare column memory but the only partial spare column memory corresponding to the faults. A self-repair circuit with $64\times1-bit$ core memory and $2\times8$ 2-D spare memory is designed. And the circuit includes a built-in-self-test block using the 13N March algorithm. The circuit has been implemented using the $0.25{\mu}m$ MagnaChip CMOS process and has $1.1\times0.7mm^2$ chip area with 10,658 transistors.

Elaboration and characterization of fiber-reinforced self-consolidating repair mortar containing natural perlite powder

  • Benyahia, A.;Ghrici, M.;Mansour, M. Said;Omran, A.
    • Advances in concrete construction
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    • v.5 no.1
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    • pp.1-15
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    • 2017
  • This research project aimed at evaluating experimentally the effect of natural perlite powder as an alternative supplementary cementing material (SCM) on the performance of fiber reinforced self-consolidating repair mortars (FR-SCRMs). For this purpose, four FR-SCRMs mixes incorporating 0%, 10%, 20%, and 30% of natural perlite powder as cement replacements were prepared. The evaluation was based on fresh (slump flow, flow time, and unit weight), hardened (air-dry unit weight, compressive and flexural strengths, dynamic modulus of elasticity), and durability (water absorption test) performances. The results reveal that structural repair mortars confronting the performance requirements of class R4 materials (European Standard EN 1504-3) could be designed using 10%, 20%, and 30% of perlite powder as cement substitutions. Bonding results between repair mortars containing perlite powder and old concrete substrate investigated by the slant shear test showed good interlocking justifying the effectiveness of these produced mortars.

The Efficient Memory BISR Architecture using Sign Bits (Sign Bit을 사용한 고효율의 메모리 자체 수리 회로 구조)

  • Kang, Il-Kwon;Kang, Sung-Ho
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.44 no.12
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    • pp.85-92
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    • 2007
  • With the development of the memory design and process technology, the production of high-density memory has become a large scale industry. Since these memories require complicated designs and accurate manufacturing processes, It is possible to exist more defects. Therefore, in order to analyze the defects, repair them and fix the problems in the manufacturing process, memory repair using BISR(Built-In Self-Repair) circuit is recently focused. This paper presents an efficient memory BISR architecture that uses spare memories effectively. The proposed BISR architecture utilizes the additional storage space named 'sign bit' for the repair of memories. This shows the better performance compared with the previous works.

Design of efficient self-repair system for multi-faults (다중고장에 대한 효율적인 자가치유시스템 설계)

  • Choi, Ho-Yong;Seo, Jung-Il;Yu, Chung-Ho;Woo, Cheol-Jong;Lee, Jae-Eun
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.43 no.11
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    • pp.69-76
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    • 2006
  • This paper proposes a self-repair system which is able to self-repair in cell unit by imitating the structure of living beings. Because the data of artificial cells move even diagonally, our system can self-repair faults not in column unit, but in cell unit. It leads to design an efficient self-repair system for multiple faults. Moreover, in artificial cell design, the usage of logic-based design method has smaller system size than that of the previous register-based design method. Our experimental result for 2-bit up/down counter shows 40.3% reduction in hardware overhead, compared to the previous method [6].

Study on Manufacturing Process of Self-Healing Microcapsules for Damage Repair in Polymeric Composites (폴리머 복합재의 손상보수를 위한 자가치료용 마이크로캡슐 제조공정 연구)

  • 윤성호;박희원;소진호;홍순지;이종근
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.793-796
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    • 2003
  • This study dealt with the manufacturing process of self-healing microcapsules for damage repair in polymeric composites. The microcapsule was consisted with a DCPD (dicyclopentadiene) as the healing agent and a urea-formaldehyde resin as the wall section. The size distribution of microcapsules were measured by a particle size analyzer using a laser diffraction technique. Thermal stability of microcapsules was investigated by using a TGA under continuous and isothermal heating conditions. According to the results, these microcapsules were verified to be to thermally stable and have a great potential to be applicable for damage repair in polymeric composites.

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