• Title/Summary/Keyword: HPF

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Scalarization of HPF FORALL Construct (HPF FORALL 구조의 스칼라화(Scalarization))

  • Koo, Mi-Soon
    • Journal of the Korea Society of Computer and Information
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    • v.12 no.5
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    • pp.121-129
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    • 2007
  • Scalarization is a process that a parallel construct like an array statement of Fortran 90 or FORALL of HPF is converted into sequential loops that maintain the correct semantics. Most compilers of HPF, recognized as a standard data parallel language, convert a HPF program into a Fortran 77 program inserted message passing primitives. During scalariztion, a parallel construct FORALL should be translated into Fortran 77 DO loops maintaining the semantics of FORALL. In this paper, we propose a scalarization algorithm which converts a FORALL construct into a DO loop with improved performance. For this, we define and use a relation distance vector to keep necessary dependence informations. Then we evaluate execution times of the codes generated by our method and by PARADIGM compiler method for various array sizes.

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Eliminating Method of Estimated Magnetic Flux Offset in Flux based Sensorless Control of PM Synchronous Motor using High Pass filter with Variable Cutoff Frequency (모터 운전 주파수에 동기화된 차단주파수를 갖는 HPF(High pass filter)를 적용한 영구자석 동기전동기의 자속기반 센서리스 제어의 추정 자속 DC offset 제거 기법)

  • Kang, Ji-Hun;Cho, Kwan-Yuhl;Kim, Hag-Wone
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.3
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    • pp.455-464
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    • 2019
  • The sensorless control based on the flux linkage of PM synchronous motors has excellent position estimation characteristics at low speeds. However, a limitation arises because the integrator of flux estimator is saturated by the DC offset generated during the analog to digital conversion(ADC) process of the measured current. In order to overcome this limitation, HPF with a low cutoff frequency is used. However, the estimation performance is deteriorated (Ed- the verb deteriorate already includes the meaning of 'problem') at high speed due to the low cutoff frequency, and increasing the cutoff frequency of the HPF induces further problems of phase leading and initial starting failure at low speeds. In this paper, the cutoff frequency of HPF was synchronized to the operation frequency of the motor: at low speeds the cutoff frequency was set to low in order to reduce the phase leading of the estimated flux, and at high speeds it was set to high to raise the DC offset removal performance. As a result, the operating range was increased by 200%. Furthermore, a phase compensation algorithm is proposed to reduce the phase leading of the HPF to less than 1.5 degrees over the full operating range. The proposed sensorless control algorithm was verified by experiment with a PM synchronous motor for a washing machine.

Effect of Coating Layer on Electrode Life for Resistance Spot Welding of Al-Coated Hpf and Zn-Coated Trip Steels (Al 도금 HPF 강판과 전기아연도금 TRIP 강판의 저항 점 용접 시 연속타점 전극의 수명에 미치는 도금층의 영향)

  • Son, Jong Woo;Seo, Jong-Dock;Kim, Dong Cheol;Park, Yeong-Do
    • Corrosion Science and Technology
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    • v.11 no.1
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    • pp.29-36
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    • 2012
  • The resistance spot welding of high strength steel degrades the weldability because of its high strength with rich chemical composition and coating layer to protect from corrosion. During the each resistance welding process the electrodes tip reacts with coating layer, then subsequently deteriorates and shorten electrode life. In this study, the Al-coated HPF (Hot Press Forming) steels and Zn-coated TRIP steels were used to investigate the electrode life for resistance spot welding. Experimental results show that the reactivity of Al-coating on HPF steels to electrode tip surface behaviors different from the conventional Zn-coated high strength steels. The electrode tip diameter and nugget size in electrode life test of Al-coated HPF steels are observed to be constant with respect to weld numbers. For Al-coated HPF steels, the hard aluminum oxide layer being formed during high temperature heat treatment process reduces reactivity with copper electrode during the resistance welding process. Eventually, the electrode life in resistance spot welding of Al-coated HPF steels has the advantage over the galvanized steel sheets.

Early Life Stage Toxicity of 2,3,7,8,-Tetrachlorodibenzop-Dioxin(TCDD) in Goldfish(Carassius auratus) (금붕어 수정난의 2,3,7,8-TCDD 노출에 따른 다이옥신 관련 유전자의 발현 및 형태학적 변화)

  • Oh, Seung-Min;Ryu, Byung-Taek;Kim, Ha-Ryong;Chung, Kyu-Hyuck
    • Environmental Analysis Health and Toxicology
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    • v.24 no.1
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    • pp.1-8
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    • 2009
  • In this study, we obtained the fertilized eggs from goldfish(Carassius auratus) and observed normal developmental stage(from fertilized eggs to larvae) in non-exposed groups. Goldfish embryos at 3 h postfertilization(hpf) were statically exposed for 1 h to either dimethylsufoxide(DMSO, 0.1%, v/v) or TCDD($0.5{\mu}g/L$). Toxicity and morphological changes were characterized from 3 to 120 h postfertilization(hpf). Egg mortality($0{\sim}48$ hpf) and hatching ratio($72{\sim}83$ hpf) in TCDD-exposed group were significantly different from control groups. However, pericardial edema was first observed at 72 hpf, followed by the onset of yolk sac edema and mortality. In addition, goldfish embryos-larvae exposed to TCDD significantly increased TCDD-related gene such as CYP1A($24{\sim}72$ hpf) and AhR2(72 hpf). This is the first study about in-depth characterization of TCDD-induced developmental toxicity in goldfish(Carassius auratus).

HPF Application Test for PD Detection of XLPE Power Cable (XLPE 전력케이블의 부분방전 검출을 위한 HPF 적용 시험)

  • Kim, Jung-Yoon;Yang, Jong-Kyung;Park, Noh-Joon;Choi, Yong-Sung;Park, Dae-Hee;Lee, Yong-Sung
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.55 no.4
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    • pp.161-165
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    • 2006
  • In this paper, we developed HPF (high pass filter) consists of lumped LC components to decrease the noises that are detected in PD (partial discharge) measuring test, and adapted it to field test. We tested it under laboratory circumstances like the fields, and measured the phase change properties of detected signal in UHF sensor with Lemke Probe and oscilloscope (TDS-3054, Tektronix). As a result, we obtained available data showing the decrease of noises in the experiments with the developed HPF from the joint box of 22.9kV distribution line. The result can be adapted to prevent the degeneration of the XLPE power cable, and to observe and diagnosis the underground power transmission cable at the ultra-high voltage.

Embryonic Development of Siberian Sturgeon Acipenser baerii under Hatchery Conditions: An Image Guide with Embryological Descriptions

  • Park, Chulhong;Lee, Sang Yoon;Kim, Dong Soo;Nam, Yoon Kwon
    • Fisheries and Aquatic Sciences
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    • v.16 no.1
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    • pp.15-23
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    • 2013
  • Normal embryonic development at a constant temperature ($18^{\circ}C$) has been described for the Siberian sturgeon Acipenser baerii (Acipenseriformes). Hormone-induced spawning and artificial insemination were performed to prepare embryonic batches for embryologic examination. After insemination, early cleavages of the Siberian sturgeon embryos continued for 7 h post-fertilization (HPF), showing the typical pattern of uneven holoblastic cleavage. Blastulation and gastrulation began at 9 HPF and 19 HPF, respectively. Epiboly formation (2/3 covered) was observed at 25 HPF during gastrulation. Neurulation was initiated with the formation of a slit-like neural groove from the blastopore at 33 HPF. During neurulation, the primary embryonic kidney (pronephros) and s-shaped heart developed. The embryos underwent progressive differentiation, which is typical of Acipenseriform species. A mass hatching was observed at 130 HPF, and the average total length of the hatched prolarvae was 10.5 mm. The hatched prolarvae possessed a typical pigment plug (yolk plug). The results of this study are valuable not only as a reference guide for the artificial propagation of Siberian sturgeon in hatcheries but also as the basis for the derivation of developmental gene expression assays for this species.

Cathepsin B & D and the Survival of Early Embryos in Red Spotted Grouper, Ephinephelus akaara

  • Gwon, Seo-Hui;Kim, Hyun Kyu;Baek, Hea Ja;Lee, Young-Don;Kwon, Joon Yeong
    • Development and Reproduction
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    • v.21 no.4
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    • pp.457-466
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    • 2017
  • Survival of embryos largely depends on yolk processing during early development. Proteolytic enzymes, cathepsin B & D (ctsb & ctsd) are known to have some important roles in yolk processing of various fish species. Mature female red spotted groupers were injected with human chorionic gonadotropin (HCG) to induce ovulation. The fertilized eggs and embryos were sampled at 0, 4 and 24 HPF (hours post fertilization). Survivals of each groups of embryos were checked at 24 and 48 HPH (hours post hatching). Transcripts of ctsb & ctsd showed the highest level at 0 HPF and relatively high at 4 HPF, but greatly decreased at 24 HPF. In bad egg quality group (BE, embryos survived until 24 HPH), transcript level of ctsb at 4 HPF were significantly lower than the transcript level at the same stage in good egg quality group (GE, embryos survived until 48 HPH) while no significant change of ctsb transcript level was observed at 0 or 24 HPF between BE and GE. Transcript level of ctsd was decreased at 24 HPF, but the difference was not as strong as the case of ctsb transcript. These results suggest that maternal ctsb transcript rather than ctsd transcript is likely to be involved in egg quality resulting in the difference of survival rate of embryos at early developmental period in this species.

Rnf152 Is Essential for NeuroD Expression and Delta-Notch Signaling in the Zebrafish Embryos

  • Kumar, Ajeet;Huh, Tae-Lin;Choe, Joonho;Rhee, Myungchull
    • Molecules and Cells
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    • v.40 no.12
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    • pp.945-953
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    • 2017
  • We report the biological functions of a zebrafish homologue of RING-finger protein 152 (rnf152) during embryogenesis. rnf152 was initially identified as a brain-enriched E3 ligase involved in early embryogenesis of zebrafish. Expression of rnf152 was ubiquitous in the brain at 24 hpf but restricted to the eyes, midbrain-hindbrain boundary (MHB), and rhombomeres at 48 hpf. Knockdown of rnf152 in zebrafish embryos caused defects in the eyes, MHB, and rhombomeres (r1-7) at 24 hpf. These defects in rnf152-deficient embryos were analyzed by whole-mount in situ hybridization (WISH) using neuroD, deltaD, notch1a, and notch3 probes. NeuroD expression was abolished in the marginal zone, outer nuclear layer (ONL), inner nuclear layer (INL), and ganglion cell layer (GCL) of the eyes at 27 hpf. Furthermore, deltaD and notch1a expression was remarkably reduced in the ONL, INL, subpallium, tectum, cerebellum, and rhombomeres (r1-7) at 24 hpf, whereas notch3 expression was reduced in the tectum, cerebellum, and rhombomeres at 24 hpf. Finally, we confirmed that expression of Notch target genes, her4 and ascl1a, also decreased significantly in these areas at 24 hpf. Thus, we propose that Rnf152 is essential for development of the eyes, midbrain and hindbrain, and that Delta-Notch signaling is involved.

Ultrastructures of Ptilota filicina (Rhodophyta) by High Pressure Freezing(HPF): Comparison of HPF Fixation and Chemical Fixation (High Pressure Freezing (HPF)을 이용한 조류 Ptilota filicina의 미세구조 관찰:HPF 고정법과 화학 고정법의 비교)

  • Lee, Sang-Hee;Kim, Youn-Joong;Jeong, Jong-Man;Kim, Jin-Gyu;Kim, Young-Min;Kweon, Hee-Seok;Moon, Won-Jin;Lee, Seok-Hoon
    • ALGAE
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    • v.21 no.4
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    • pp.479-483
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    • 2006
  • In preparation of the biological samples for electron microscopy, the chemical fixation by glutaraldehyde, paraformaldehyde, and OsO4 has been generally used for a long time. However, the chemical fixation method has some problems: the infiltration time is a little bit long and the ultrastructure of cell or tissue transforms before complete fixation of sample. So, recently, cryo-fixation is considered more often in biomedical field. In this study, we compared High Pressure Freezing (HPF) method with chemical fixation method using a algal sample (Ptilota filicina J. Agardh), which was difficult to fix using chemical fixation method. In chloroplast, the ultrastructure of thylakoid lamella and phycobilisome can not show clearly by chemical fixation. In this study we could observe the ultrastructure of thylakoid lamella and phycobilisome of chloroplast very clearly using HPF fixation. An improved images of ultrastructures of nucleus, mitochondrion and floridean starch could obtain. These results suggest that HPF method is very useful method in algal specimen for electron microscopy.

Phase Image of Susceptibility Weighted Image Using High Pass Filter Improved Uniformity (위상영상 획득 시 영상의 균일도 향상을 위한 high pass filter의 적용)

  • Lee, Ho-Beom;Choi, Kwan-Woo;Son, Soon-Yong;Na, Sa-Ra;Lee, Joo-Ah;Min, Jung-Whan;Kim, Hyun-Soo;Ma, Sang-Chull;Jeong, Yeon-Jae;Jeong, Yeon-Gyu;Yoo, Beong-Gyu;Lee, Jong-Seok
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.11
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    • pp.6702-6709
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    • 2014
  • In this study, a susceptibility weighted image (SWI) showed a wrapped phase and a non-uniformity of the rapid susceptibility difference. Consequently, the bandwidth limits at low frequency were improved by applying HPF. From November 2013 to March 2014, a three-dimensional SWI was obtained from patients and compared with the existing images and HPF phase images. The maximum and minimum signal intensity differences and non-uniformity were analyzed. As a result, a high pass filter before and after applying the maximum and minimum of the signal intensity difference was decreased by 274.16% (498.98), and the non-uniformity was decreased by 439.55% (19.83). After applying the HPF, a comparison with the existing phase images revealed the HPF phase images to have high signal and image uniformity of the SWI image. A high pass filter method can effectively remove the non-uniformity and improve the overall image quality.