• Title/Summary/Keyword: Rounding

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Optimal Process Planning of CNG Pressure Vessel by Ensuring Reliability and Improving Die Life (CNG 압력용기의 최적 공정설계를 통한 공정의 신뢰성 확보 및 다이 수명 향상)

  • Bae, Jun Ho;Lee, Hyun Woo;Kim, Moon Saeng;Kim, Chul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.7
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    • pp.865-873
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    • 2013
  • The deep drawing and ironing (DDI) process involving the use of a high-capacity horizontal press is used for manufacturing acompressed natural gas (CNG) pressure vessel. However, some variables of the DDI process have been determined based on the experiences of workers, and the short die life needs to be improved for manufacturing the pressure vessel withhighquality and lowcost. In this study, process variables such as the draw ratio, distance between dies, radius of rounding of drawing die, and angle of ironing die are chosen to enhance the reliability and improve the die life based on previous studies and experiences. The draw ratio limits at which no tearing or wrinkling occurs are determined using FEA, and the distances between dies, radius of rounding of drawing die, and angle of ironing die are optimized by the DOE method. The results of the optimal process variables are compared with those of the existing DDI process for verifying their effectiveness.

Floating Point Converter Design Supporting Double/Single Precision of IEEE754 (IEEE754 단정도 배정도를 지원하는 부동 소수점 변환기 설계)

  • Park, Sang-Su;Kim, Hyun-Pil;Lee, Yong-Surk
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.48 no.10
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    • pp.72-81
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    • 2011
  • In this paper, we proposed and designed a novel floating point converter which supports single and double precisions of IEEE754 standard. The proposed convertor supports conversions between floating point number single/double precision and signed fixed point number(32bits/64bits) as well as conversions between signed integer(32bits/64bits) and floating point number single/double precision and conversions between floating point number single and double precisions. We defined a new internal format to convert various input types into one type so that overflow checking could be conducted easily according to range of output types. The internal format is similar to the extended format of floating point double precision defined in IEEE754 2008 standard. This standard specifies that minimum exponent bit-width of the extended format of floating point double precision is 15bits, but 11bits are enough to implement the proposed converting unit. Also, we optimized rounding stage of the convertor unit so that we could make it possible to operate rounding and represent correct negative numbers using an incrementer instead an adder. We designed single cycle data path and 5 cycles data path. After describing the HDL model for two data paths of the convertor, we synthesized them with TSMC 180nm technology library using Synopsys design compiler. Cell area of synthesis result occupies 12,886 gates(2 input NAND gate), and maximum operating frequency is 411MHz.

A Comparative Analysis of Performance of Ambiguity Validation Methods (미지정수 후보 타당성 검정 기법간의 비교 분석)

  • Ko, Jae-Young;Shin, Mi-Young;Han, Young-Hoon;Cho, Deuk-Jae
    • Journal of Navigation and Port Research
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    • v.39 no.1
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    • pp.15-21
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    • 2015
  • In high precision positioning systems based on GNSS, ambiguity resolution is an important procedure. Correct ambiguity leads to positioning results which have high precision between millimeters and centimeters. However, when the ambiguity is determined incorrectly, ensuring accuracy and precision of the positioning result is impossible. An ambiguity validation test is required to obtain correct ambiguity when ambiguity resolution is performed based on the ILS (Integer Least Squares), which shows the best performance in point of theory and experiment when compared with other methods such as IR (Integer Rounding) and IB (Integer Bootstrapping). Comparison between the candidates of the validation test is needed to judge ambiguity correctly, because ILS searches for candidates of integer ambiguity, unlike other methods which calculate only one integer ambiguity. We analyzed the experimental performance of ambiguity validation tests. R-ratio, F-ratio and W-ratio were adopted for analysis. The performance of validation tests was evaluated by classifying normal operation, detection, missed detection and false alarm. As a result, strengths and weaknesses of validation tests was showed to experimental. we concluded that validation tests must be selected according to environment.

Biological Properties of Vero Cell-Adapted Newcastle Disease Virus (Vero 세포적응 뉴캣슬병 바이러스의 생물학적 특성)

  • Choi, Kang-Seuk;Park, Mi-Ja;Kye, Soo-Jeong;Kim, Ji-Ye;Kwon, Jun-Hun
    • Korean Journal of Poultry Science
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    • v.39 no.2
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    • pp.113-120
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    • 2012
  • Newcastle disease virus (NDV) Kr005/V strain was generated through 55 serial passages of NDV Kr005 strain in Vero cells. The Kr005/V virus yielded high infective titers of $10^{7.8}$ $TCID_{50}/mL$ in Vero cells and the infected cells showed cytopathic effects such as marked cell rounding, though less frequent syncytia. The Kr005/V virus was heat-stable and classified into the lentogenic type with a Mean Death Time (MDT) of 120h or greater while the Kr005 strain was heat-labile and velogenic (MDT of 49.6 h). Only the single amino acid substitution (T to S) was observed at position 433 of the HN protein of the Kr005/V strain, whereas no amino acid change was found in the F protein. The Kr005/V input virus correlated well (correlation coefficient $r^2$=0.97) with the Kr005 virus when ten field sera were tested by virus neutralization test. The biological properties and usefulness of Vero cell-adapted Kr005/V virus were discussed.

Effect of a Fibrinolytic Enzyme (BK-17) from Bacillus subtilis on Apoptosis Induction in AGS and T24 Human Carcinoma Cells (인간 암세포인 AGS와 T24에서의 apoptosis 유도에 미치는 Bacillus subtilis 혈전용해효소 BK-17의 영향)

  • Baik, Hyun;Seo, Min Jeong;Kim, Min Jeong;Lee, Hye Hyeon;Kang, Byoung Won;Park, Jeong Uck;Choi, Yung Hyun;Seo, Kwon Il;Jeong, Yong Kee
    • Journal of Life Science
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    • v.23 no.10
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    • pp.1252-1259
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    • 2013
  • To investigate the effects of a fibrinolytic enzyme, BK-17, on the growth of human cancer cells, we performed various biochemical experiments, including cell proliferation and viability, and investigated subsequent morphological changes and apoptosis induction. BK-17 treatment of AGS human gastric and T24 human bladder carcinoma cells decreased the viability and the proliferation of the cells in a concentration-dependent manner. Microscopic studies indicated that the antiproliferative effects of the BK-17 treatment were associated with morphological changes, such as membrane shrinking, cell rounding up, and the formation of apoptotic bodies, indicating that BK-17 induced apoptosis in the cell lines. Of note, RT-PCR and Western blotting data indicated that the BK-17 treatment induced the down-regulation of antiapoptotic Bcl-2 members, Bcl-2 and $Bcl-X_L$, and the up-regulation of proapoptotic Bax members, Bax and Bad, in the AGS cells. BK-17-induced apoptosis of AGS cells was involved in the proteolytic activation of caspase-3, caspase-8, and caspase-9. Taken together, these findings suggest that BK-17 is associated with the induction of apoptotic cell death.

Fixed node reduction technique using relative coordinate estimation algorithm (상대좌표 추정 알고리즘을 이용한 고정노드 저감기법)

  • Cho, Hyun-Jong;Kim, Jong-Su;Lee, Sung-Geun;Kim, Jeong-Woo;Seo, Dong-Hoan
    • Journal of Advanced Marine Engineering and Technology
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    • v.37 no.2
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    • pp.220-226
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    • 2013
  • Recently, with the rapid development of factory automation and logistics system, a few workers were able to manage the broad workplace such as large vessels and warehouse. To estimate the exact location of these workers in the conventional wireless indoor localization systems, three or more fixed nodes are generally used to recognize the location of a mobile node consisting of a single node. However, these methods are inefficient in terms of node deployment because the broad workplace requires a lot of fixed nodes compared to workers(mobile nodes). Therefore, to efficiently deploy fixed nodes in these environments that need a few workers, this paper presents a novel estimation algorithm which can reduce the number of fixed nodes by efficiently recognizing the relative coordinates of two fixed nodes through a mobile node composed of three nodes. Also, to minimize the distance errors between mobile node and fixed node, rounding estimation(RE) technique is proposed. Experimental results show that the error rate of localization is improved, by using proposed RE technique, 90.9% compared to conventional trilateration in the free space. In addition, despite the number of fixed nodes can be reduced by up to 50% in the indoor free space, the proposed estimation algorithm recognizes precise location which has average error of 0.15m.

A design of Floating Point Arithmetic Unit for Geometry Operation of Mobile 3D Graphic Processor (모바일 3D 그래픽 프로세서의 지오메트리 연산을 위한 부동 소수점 연산기 구현)

  • Lee, Jee-Myong;Lee, Chan-Ho
    • Proceedings of the IEEK Conference
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    • 2005.11a
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    • pp.711-714
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    • 2005
  • We propose floating point arithmetic units for geometry operation of mobile 3D graphic processor. The proposed arithmetic units conform to the single precision format of IEEE standard 754-1985 that is a standard of floating point arithmetic. The rounding algorithm applies the nearest toward zero form. The proposed adder/subtraction unit and multiplier have one clock cycle latency, and the inversion unit has three clock cycle latency. We estimate the required numbers of arithmetic operation for Viewing transformation. The first stage of geometry operation is composed with translation, rotation and scaling operation. The translation operation requires three addition and the rotation operation needs three addition and six multiplication. The scaling operation requires three multiplication. The viewing transformation is performed in 15 clock cycles. If the adder and the multiplier have their own in/out ports, the viewing transformation can be done in 9 clock cycles. The error margin of proposed arithmetic units is smaller than $10^{-5}$ that is the request in the OpenGL standard. The proposed arithmetic units carry out operations in 100MHz clock frequency.

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An Implementation of Pan-So-Ri Classification Program Using Naive Bayesian Classifier (나이브 베이지안 분류기를 이용한 판소리 분류 프로그램 구현)

  • Kim, Won-Jong;Lee, Kang-Bok;Kim, Myung-Gwan
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.3
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    • pp.153-159
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    • 2011
  • Pan-So-Ri singing a story as song is one of Korea traditional musics. it divide into two sect(east-sect, west-sect), and it is hard to classify two sect without knowledge about Pan-So-Ri. In this paper, we have propose a Pan-So-Ri classification program using PCD(Pitch Class Distribution) and Naive Bayesian Classifier. Attribute value of classifier is each appearance frequency of pitch. Experiment is conducted two time with different rounding off location of probability value. Better one show correct classification with east-sect 80%, west-sect 97%, and total accuracy of 88%. this result is used our program.

Improvement of Breakdown Characteristics Using Ribbed Spacer of GIS (GIS 립 스페이서에 의한 파괴전압 특성 개선)

  • 류성식;최영찬;곽희로
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.15 no.5
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    • pp.28-33
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    • 2001
  • This paper describes the effect of various conditions of the ribs on the breakdown characteristics when metal particle is attached to the spacer in GIS. More improved spacer shape in breakdown characteristics than conventional one is proposed by comparing the results acquired by varying location, length and thickness of the ribbed spacer. As a result, it was found that the electrical breakdown characteristics of the spacer with two ribs were generally better than that with only one rib or no ribs, and it was dependent on the rib length and rib thickness. Especially, it was also confirmed that the electrical breakdown characteristics were more improved by rounding the rib edge.

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Variation of Residual Welding Stresses in Incoloy 908 Conduit during the Jacketing of Superconducting Cables

  • Lee, Ho-Jin;Kim, Ki-Baik;Nam, Hyun-Il
    • Progress in Superconductivity and Cryogenics
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    • v.5 no.1
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    • pp.71-75
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    • 2003
  • The conduit fer superconducting cable is welded and plastically deformed during the jacketing process to make the CICC (Cable-in-Conduit-Conductors) fer a fusion magnet. The jacketing process of KSTAR (Korea Superconducting Tokamak Advanced Research) conductors is composed of several sequential steps such as rounding, welding, sizing, and square-rolling. Since the welded zone in Incoloy 908 conduit is brittle and easy to have flaws, there may be a possibility of stress corrosion cracking during the heat treatment of coil when both the induced tensile residual stress and the concentration of oxygen in the furnace are sufficiently high. The steps of the jacketing process were simulated using the finite element method of the commercial ABAQUS code, and the stress distribution in the conduit in each step was calculated, respectively. Furthermore, the variations of residual welding stresses through the steps of the jacketing process were calculated and analyzed to anticipate the possibility of the stress corrosion cracking in the conduit. The concentrated high tensile residual welding stresses along the welding bead decrease by the plastic deformation of the following sizing step. The distribution in residual stresses in the conductor for magnet coil is mainly governed by the last step of square-rolling.