• Applied Microscopy
• /
• v.31 no.2
• /
• pp.129-141
• /
• 2001

To investigate the spermiogenesis of the Saghalien Pygmy shrew (Sorex minutus gracillimus), the testis obtained from mature male shrew was studied by electron microscopy, and the following results obtained based on the morphological characteristics of cell differentiation of the seminiferous epithelium in the testis. According to the fine structural differentiation, spermiogenesis of S. minutus gracillimks was divided into Golgi, cap, acrosome, maturation and spermiation phases. Beside, the Golgi and cap phases were subdivided into three steps of early, middle and late phase respectively, and acrosome phase into two steps of early and late phase , and maturation and spermiation phases has only one step respectively. Thus, the spermiogenesis of S. minutus gracillimus was divided into a total of ten steps. The chromatin granules begin to be condensed in the acrosome phase, and a perfect nucleus of sperm was formed at the spermiation phase. Mancette were appeared from the late acrosome phase to the maturation phase. The formation of sperm tail began to develop in the late Golgi phase, and completed at the spermiation phase. Multivesicular bodies were appeared from the Golgi phase to the maturation phase, recognized with pale, pale and moderate, and dense at Golgi, cap and acrosomal and matulation phases respectively.

• Proceedings of the KIEE Conference
• /
• 1998.07a
• /
• pp.119-121
• /
• 1998

Phase controller is made and tested to estimate the characterics of superconductor. Phase controller using the DSP2104 can determine the closing phase angle and period of transport current increased by shorting bypassed circuit. In this paper, the experimental results are described.

• The Plant Pathology Journal
• /
• v.30 no.2
• /
• pp.215-219
• /
• 2014

The GacS/GacA two component system regulates various traits related to the biocontrol potential of plant-associated pseudomonads. The role of the sensor kinase, GacS, differs between strains in regulation of motility. In this study, we determined how a gacS mutation changed cell morphology and motility in Pseudomonas chlororaphis O6. The gacS mutant cells were elongated in stationary-phase compared to the wild type and the complemented gacS mutant, but cells did not differ in length in logarithmic phase. The gacS mutant had a two-fold increase in the number of flagella compared with the wild type strain; flagella number was restored to that of the wild type in the complemented gacS mutant. The more highly flagellated gacS mutant cells had greater swimming motilities than that of the wild type strain. Enhanced flagella formation in the gacS mutant correlated with increased expression of three genes, fleQ, fliQ and flhF, involved in flagellar formation. Expression of these genes in the complemented gacS mutant was similar to that of the wild type. These findings show that this root-colonizing pseudomonad adjusts flagella formation and cell morphology in stationary-phase using GacS as a major regulator.

• Asian Pacific Journal of Cancer Prevention
• /
• v.16 no.17
• /
• pp.7917-7922
• /
• 2015

DNA ploidy is an important prognostic parameter in paediatric B-ALL, but the significance of the S-phase fraction is unclear. In present study, DNA ploidy was assessed in 40 pediatric B-ALL cases by flow cytometry. The DI (DNA index) and percentage of cells in S-phase were calculated using Modfit software. Aneuploidy was noted in 26/40 (65%) cases. A DI of 1.10-1.6 (hyperdiploidy B) was noted in 20/40 (50%) and 6/40 (15%) had a DI>1.60 (triploid and tetraploid range). Some 14/40 (35%) cases had a diploid DI between 0.90-1.05. None of the cases had a DI <0.90 (hypodiploid) or in the 1.06-1.09 (hyperdiploid A) range. The mean S-phase fraction was 2.6%, with 24/40 (60%) having low and 16/40 (40%) high S-phase fractions. No correlation was noted with standard ALL risk and treatment response factors with DI values or S-phase data, except for a positive correlation of low S-phase with high NCI risk category (p=0.032). Overall frequency of hyperdiploidy in our cohort of B-ALL patients was very high (65%). No correlation between hyperdiploidy B and low TLC or common B-phenotype was observed in our study as 42% cases with DI 1.10-1.6 had TLC> $50{\times}10^9$ and 57.1% CD 10 negativity. The study also highlighted that S-phase fraction analysis does not add any prognostic information and is not a useful parameter for assessment in ALL cases. However, larger studies with long term outcome analysis are needed to derive definitive conclusions.

• Journal of the Korean Institute of Telematics and Electronics S
• /
• v.34S no.12
• /
• pp.10-18
• /
• 1997

The parallel trabutary signals in the SDH-based transmission system have the frame phase skew due to uneven transmission delays in the data and the clock path. This phase skew must be eliminated prior to synchronously multiplexing process. A new twenty-four channel, 51.84Mb/s DFPA(Digital Frame Phase Aligner) has been designed and fabricated in 0.8.mu.m CMOS gate array. This unique device phase-aligns the skewed input signals with refernce frame synchronous signal and reference clok for subsequent synchronous multiplexing process. the performance of fabricated device is evaluated by the STM-16 transmission system and DS-3 meansurement set. The frame phase margin of +2/-3 bit periods has been demonstrated.

• 한국신재생에너지학회:학술대회논문집
• /
• 2005.06a
• /
• pp.172-176
• /
• 2005

Phase Lacked Loop(PLL)은 분산전원을 계통연계시 동기설정을 위해 중요한 장비이다. 이러한 동기설정은 Point of Common Coupling(PCC)에서 계통 전압을 검출하여 크기와 위상을 동일하게 설정하여 전력변환장치에서 전력을 출력한다. 일반적으로 PCC에서 계통전압을 검출하였을 때 고조파, 상간불평형은 전력변환장치 출력 왜곡을 야기 시킨다. 본 논문에서는 이러한 출력왜곡을 감소시키기 위한 3상 PLL을 모델링하여, 그 제어 성능을 시뮬레이션을 통해 확인하였다.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2002.08a
• /
• pp.724-727
• /
• 2002

2,7-dibromo-9, 9-dialkyl-substituted-fluorene derivatives were prepared by the alkylation of 2,7-dibromofluorene with various alkyl groups under two-phase phase transfer catalysis (PTC) conditions, as monomers for synthesizing poly(dialkylfluorene)s. Tetra-nbutylammonium hydrogen sulfate (TBAHS) was used as a phase transfer catalyst to enhance nucleophilic substitution. In addition, NaOH in water (25M) was used as a base to generate anions. Compared to conventional alkylation using butyllithium(BuLi), the reaction using the PTC technique attained high selectivity and substantial conversion of reactants, due to the enhanced reaction rate, while the reaction was carried out under moderate conditions. An approximately 90% yield was obtained from the reaction and the reaction time was remarkably reduced. 2,7-dibromo-9,9-dihexyl-fluorene, 2,7-dibromo-9,9-dioctyl-fluorene, and 2,7-dibromo-9,9-di(2-ethylhexyl)-fluorene were effectively synthesized by phase transfer catalytic reaction.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2000.01a
• /
• pp.61-62
• /
• 2000

We have studied the molecular orientation by the phase transitions of the chiral smectic liquid crystals, 4-(1-Trifluoromethyl-6-ethoxy-hexyloxycarbonlphenyl)-4-nonyloxybiphenyl-4-carbo-xylate (R-TFMEOHPNBC) to seek the original solution of the zig-zag defect using two different experimental techniques; optical system and x-ray scattering. The phase sequence is gamma ferroelectric $(SmC{\gamma}\;^*)$ ${\rightarrow}$ smectic A (SmA) ${\rightarrow}$ isotropic (I). Existence of two layer spacing at chiral smectic phase gives a possibility of the molecular orientation in two different tilt angles, ${\theta}\;_1$ and ${\theta}\;_2$, which are separated each other to the layer normal at a given temperature. The gamma ferroelectric-like phase is, first, discovered in the single compound.

• Proceedings of the KIEE Conference
• /
• 2001.07a
• /
• pp.458-460
• /
• 2001

This paper described the unbalanced voltage on the tertiary bus of a single Phase auto transformer in the case of parallel operation with different manufacturer at each Phase. The unbalanced capacitances between primary to secondary winding, secondary to tertiary winding and primary to tertiary winding makes unbalanced bus voltage in the tertiary bus side. The unbalanced voltage let the surge arrester to operate in the power frequency range, and it causes the arrester to burn out. The failure of the arrester at one phase makes line to ground fault, which lead to the surge arrester failure of the other two phase on the tertiary bus.

• Journal of the Korea Society of Computer and Information
• /
• v.21 no.11
• /
• pp.79-83
• /
• 2016

In this paper, we define four levels of analysis, design, implementation, and testing of the configuration of the development phase by S/W development life cycle. In particular, it dealt with the stage of the analysis phase to prepare an information system developed intensively. Details of the derivation of the information security requirements, it can be seen that comes from the perspective of confidentiality, integrity, availability and accountability, etc. It dealt with from the first manifestations of the projects planning to final planning to establish information security in activities of the Information Security requirements. As an example exhibited by assessing the information security analysis phase activities of S corporations, it can be seen that the improved sales rise in information security activities.