• Title/Summary/Keyword: Threaded

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A Parsing Algorithm for Constructing Incremental Threaded Tree (점진적 스레드 트리를 구성하기 위한 파싱 알고리즘)

  • Lee Dae-Sik
    • Journal of Internet Computing and Services
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    • v.7 no.4
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    • pp.91-99
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    • 2006
  • The incremental parsing technique plays an important role in language-based environment which allows the incremental construction of a program. It improves the performance of a system by reanalyzing only the changed part of a program. The conventional incremental parsing uses the stack data structure in order to store the parsing information. In this paper, we suggest a threaded tree construction algorithm which parse by adding the threaded node address instead of using a stack data structure. We also suggest an incremental threaded tree construction which has incremental parsing process of five steps using the constructed threaded tree.

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The Treatment for Mandibular Condyle Fracture of Children by a Threaded Kirshcner Wire and External Rubber Traction (Threaded Kirschner Wire와 외부 고무줄 견인을 통한 소아 하악골 관절돌기 골절의 치료)

  • Nam, Doo Hyun;Kwon, Ino;Ahn, Hyung Sik;Kim, Jun Hyuk;Lee, Young Man
    • Archives of Plastic Surgery
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    • v.36 no.2
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    • pp.221-224
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    • 2009
  • Purpose: The treatment of children mandibular condyle fracture that is severely displaced is controversial. The conservative treatment of it may lead to complications - mandibular deficiency, asymmetry, malocclusion and temporomandibular joint dysfunction. Moreover, open reduction carries risks for growth retardation, facial nerve injury, scarring and joint stiffness. The aim of this article is to present an alternative technique of the treatment by using a threaded Kirschner wire and external rubber traction. Materials: From November 2005 to May 2008, three patients underwent the management by using a threaded Kirschner wire and external rubber traction. A threaded Kirschner wire was inserted in the condylar segment by using a C-arm. We applied the external rubber traction, and we reducted the segment progressively until complete reduction. The mandibular - maxillary fixations were removed after 3 weeks, and patients went into training for mouth opening. Results: The technique didn't result in complications - joint dysfunction, facial nerve injury, sore, infection and nonunion during follow - up period. Radiologic follow - up examinations revealed correct reduction in all patients. In all cases, we found restoration of preinjury occlusion and temporomandibular joint function. Conclusions: Closed reduction of children mandibular condyle fracture by using a threaded Kirschner wire and external rubber traction did achieve anatomic reduction and restore mandibular height. This alternative technique is simple, effective, inexpensive, easy to apply and minimally invasive.

Mechanical Splicing Characteristic of the Threaded Bar according to the Contact Conditions of the Transverse Rib (마디접촉조건에 따른 나사철근의 기계식 이음 특성)

  • Kim, J.M.;Choi, S.W.;Kim, B.M.
    • Transactions of Materials Processing
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    • v.28 no.3
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    • pp.145-153
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    • 2019
  • The objective of this study is to analyze the mechanical splicing characteristic of the threaded bar according to the contact conditions of the transverse rib. In order to consider the contact conditions of the rib, selection of the main variables including the gap of the core diameter ($l_c$), rib angle (${\theta}$), and the number of contacts ($C_N$) of transverse rib was done. So as to analyze the splicing characteristic of the D51 threaded bar, a finite element (FE) simulation of the tensile test was conducted using the designed D51 threaded bar and coupler. Through FE simulation results, it was verified that the mechanical slicing characteristics varied based on the main design variables ($l_c$, ${\theta}$, and $C_N$). It was further confirmed that it was important to determine the $C_N$ in consideration of $l_c$. Additionally, the tensile test results of the D25 and D51 threaded bar combined with the couplers were similar to FE simulation results. Furthermore, to quantitatively evaluate FE simulation and test results, the calculation equation for the contacted projection area ratio (R) of the transverse rib was proposed. To secure a mechanical splicing joint of the threaded bar, it was established that the R calculated using the proposed equation had to be greater or equal to 40%.

A Threaded Tree Construction Algorithm not Using Stack (스택을 이용하지 않는 스레드 트리 구성 알고리즘)

  • Lee Dae-Sik
    • Journal of Internet Computing and Services
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    • v.5 no.5
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    • pp.119-127
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    • 2004
  • As, the development of language-based programming environment, a study on incremental parsing has become an essential part. The purpose of this paper is to show the more efficient incremental parsing algorithm than earlier one that demands parsing speed and memorizing space too much. This paper suggests the threaded tree construction algorithm not using stack. In addition, to remove the reparsing process, it proposes the algorithm for creation node and construction incremental threaded tree not using stack.

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On Design and Implementation of Incremental LR Parsing Algorithm Using Changed Threed Tree (변화된 스레드 트리를 이용한 점진적 LR 파싱 알고리즘 구현 및 설계)

  • Lee, Dae-Sik
    • Convergence Security Journal
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    • v.5 no.4
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    • pp.19-25
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    • 2005
  • Threaded Tree is the data structure that can express parse stack as well as parse tree with LR parsing table. $Larchev\^{e}que$ makes Threaded Tree and Incremental Parsing with stack. This paper suggests the algorithm consisting of changed threaded tree without stack in order to reduce reparsing node and parsing speed. Also, it suggests incremental parsing algorithm to get rid of the reparsing process in node.

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A Study on Filtering Techniques for Dynamic Analysis of Data Races in Multi-threaded Programs

  • Ha, Ok-Kyoon;Yoo, Hongseok
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.11
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    • pp.1-7
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    • 2017
  • In this paper, we introduce three monitoring filtering techniques which reduce the overheads of dynamic data race detection. It is well known that detecting data races dynamically in multi-threaded programs is quite hard and troublesome task, because the dynamic detection techniques need to monitor all execution of a multi-threaded program and to analyse every conflicting memory and thread operations in the program. Thus, the main drawback of the dynamic analysis for detecting data races is the heavy additional time and space overheads for running the program. For the practicality, we also empirically compare the efficiency of three monitoring filtering techniques. The results using OpenMP benchmarks show that the filtering techniques are practical for dynamic data race detection, since they reduce the average runtime overhead to under 10% of that of the pure detection.

Strength Performance Evaluation of Threaded Nail Joints of Wooden Retaining Wall Using Pitch Pine (Pinus rigida Miller) Square Timber (리기다 소나무 정각재를 사용한 목재옹벽의 직결나사못 접합부 내력 성능 평가)

  • Song, Yo-Jin;Kim, Keon-Ho;Lee, Dong-Heub;Hwang, Won-Joung;Hong, Soon-Il
    • Journal of the Korean Wood Science and Technology
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    • v.39 no.1
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    • pp.53-59
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    • 2011
  • A connection was made between a single stretcher and 2 headers with 2 threaded nails (Type-A), and another one between 2 stretchers and 2 headers with 4 threaded nails (Type-B) to use as specimens. Type-C was the stretchers that are connected with 2 threaded nails by half lap joint at end-distance 5D to reinforce Type-B, Type-C1 the stretchers that are connected by half lap joint at end-distance 10D, and Type-C2 with 3 threaded nails at end-distance 10D. Compressive shear strength of Type-C, the supplementation of Type-B, was decreased by 30%, compared with that of Type-B. Those of Type-B and Type-C1 that used longer end-distance than Type-C were about the same, and that of Type-C2 connected with 3 threaded nails was 1.28-times stronger than that of Type-C1. Connection of the retaining wall using existing square timber has a problem between long and short stretchers and 2 headers. So it was investigated in the experiment to replace it. Therefore, if Type-B is replaced with Type-C2 in constructing the retaining wall, the crack and the rupture of timber caused by threaded nail as well as construction period can be reduced, and also it can be expected to increase their own strength.

Mechanical Performance Comparison of Pedicle Screw Based on Design Parameters: Dual Lead and Dual Pitch (척추경 나사못의 디자인이 고정력 및 구동 토크에 미치는 영향 분석: 이중 나사 및 이중 피치 나사)

  • Choi, Sun-Gak;Cha, Eun-Jong;Kim, Kyung-Ah;Ahn, Yoon-Ho
    • Journal of Biomedical Engineering Research
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    • v.39 no.3
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    • pp.134-139
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    • 2018
  • One of the most common problems with pedicle screw system is pullout of the screw. This study was performed to evaluate the pullout strength and driving torque of newly designed pedicle screws. The design of three type screws were standard pedicle screw, which had single lead threaded and single pitched design (Type A), single pitched and dual lead threaded pedicle screw (Type B), dual pitched and dual lead threaded pedicle screw (Type C), respectively. The tests were performed in accordance with the ASTM standards using polyurethane (PU) foam blocks. There was no significant difference in pullout strength among three types of screw. Type B and Type C exhibited higher insertion torque and removal torque than Type A, respectively (p<0.05). Pedicle screws newly developed with dual pitched and dual lead threaded design showed higher driving torque without decrease in pullout strength compared to the standard pedicle screw and could be inserted more rapidly with the same number of revolutions.

A new method for repair of fiber reinforced concrete corbels using steel threaded rods

  • Gulsan, Mehmet Eren;Shaikhan, Mustafa A.
    • Earthquakes and Structures
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    • v.15 no.2
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    • pp.165-178
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    • 2018
  • The aim of this study is to investigate the efficiency of using threaded rods and steel profiles to produce a steel confining system for rehabilitation of damaged concrete corbels for the first time in literature. Some of the specimens were repaired by crack repair epoxy before being confined for further enhancement. A total of 19 two sided damaged corbels were used in the study with different mechanical properties and parameters but similar dimensions. The differences were in rehabilitation style, shear span, fiber percentage, reinforcement steel diameter, and concrete strength. The rehabilitated specimens were loaded with vertical load until failure. Four different configurations were used in the investigation. Test results show that the proposed rehabilitation technique is effective to enhance the load capacity of the corbels and to improve their ductility. Moreover, new formulations were proposed to calculate the load capacity of the rehabilitated corbels. A good fit was observed between numerical and experimental results.