• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.05b
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• pp.128-130
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• 2000

A new type ac plasma display panels(PDPs) cells are designed and tested electrically and optically. One cells have the structure of sin discharge path shape and small electrode area. The other cells have the non-symmetric structure with a same electrode area. They show a higher luminous efficienccy and a lower power consumption about 30% improvement than the conventional standard ac PDP cells.

• Proceedings of the KIEE Conference
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• 1997.11a
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• pp.370-372
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• 1997

In this paper, magnetic fields produced by lightning return strokes were investigated and analyzed Magnetic field and its derivatives were measured with two crossed loop antennas. Frequency bandwidths of the magnetic field and its derivative measuring systems are in the range of $270\;[Hz]\;{\sim}\;2.3\;[MHz]$ and $450\;[Hz]\;{\sim}\;2.5\;[MHz]$, and their response sensitivity are 128 [mV/${\mu}T$] and 4.12 [mV/nT//${\mu}s$], respectively. Signals are digitized every 500 [ns], data are automatically recorded by transient signal analyzer(Nicolet Pro. 30) having the resolution of 12 - bit and the length of 5 kilowords, and they are registered at personal computer. Magnetic field and its derivative waveforms associated with lightning return strokes were observed since the summer of 1997 at Inha University in Inchon.

• Journal of The Korean Astronomical Society
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• v.39 no.4
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• pp.125-128
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• 2006

In order to determine the precise effective temperature and surface gravity of warm stars, all synthetic spectral lines in the wavelength range of $4000-5700{\AA}$ with T=6000-7750 K, and log g=3.5, 4.0, and 4.5 for [M/H]=0.0, $V_{rot}$=10 km $s^{-1}$, and $V_{tubl}$=2 km $s^{-1}$ were calculated using the SYNSPEC package(Hubeny, et al., 1995) and the Kurucz(1995) model. Then, the depth-ratios for all line pairs were investigated and we selected two and six depth-ratios appropriate for the surface gravity and temperature indicators, respectively. We plotted six grids with X- and Y-axes for the depth-ratios of surface gravity and temperature, respectively, for the simultaneous estimation of these two atmospheric parameters. This method was applied to the spectum of $\delta$ Scu for the determination of its temperature and surface gravity simultaneously.

• Proceedings of the KIPE Conference
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• 2007.07a
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• pp.126-128
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• 2007

This paper presents a new soft switching dc-to-dc converter that employs IM transformer. Detailed analysis and design considerations of the proposed circuits are presented. By applying the proposed magnetic integration procedure, new integrated magnetic circuits featuring low loss, simple structure are then developed to overcome the limitations of prior art. Consequently, the power loss and the size of the integrated magnetic device are greatly reduced. The operation and performance of the proposed converter are demonstrated with an experimental converter that delivers a 5V/5A output from a 48V input at the maximum efficiency of 90 %.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.128-129
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• 2007

We fabricated seeded $SrBi_2Ta_2O_9$(SBT) thin films using seeding technique on the $LaZrO_x$ (LZO)/Si structure. To evaluate the ferroelectric properties of seeded SBT thin films, we investigated the crystalline phase, the surface morphology, the capacitance-voltage (C-V) curve and the current density-voltage (J-V) curve of seeded films and then compared with the physical and electrical properties of unseeded films. As the result of that, the characteristics of seeded and unseeded films have a slight difference. Therefore, the ferroelectric properties of seeded SBT thin films are not necessarily superior than unseeded films.

• Journal of the Korean Institute of Telematics and Electronics
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• v.23 no.1
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• pp.101-113
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• 1986

In this paper, a real-time pitch detector LPC vocoder as implemented on a high speed digital signal processor, NEC 7720, is described. The pitch detector was based mainly on the SIFT algorithm. The SIFT pitch detector consists primarily of a digital low pass filter, inverse filter, computation of autocorrelation, a peak picker, interpolation, V/UV defcision and a final pitch smoother. In our approach, modification, mainly on the V/UV decision and a final pitch smoother, was made to estimate more accurate pitches. An 16-bit fixed-point aithmatic was employed for all necessary computation and the simulated results were compared with the eye detected pitches obtained from real speech data. The pitch detector occupies 98.8% of the instruction ROM, 37% of the data ROM, and 94% of internal RAM and takes 15.2ms to estimate a pitch when an analysis frame is consisted of 128 sampled speech data. It is observed that the tested results were well agreed with the computer simulation results.

• Parasites, Hosts and Diseases
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• v.55 no.2
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• pp.121-128
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• 2017

Protozoan viruses may influence the function and pathogenicity of the protozoa. Trichomonas vaginalis is a parasitic protozoan that could contain a double stranded RNA (dsRNA) virus, T. vaginalis virus (TVV). However, there are few reports on the properties of the virus. To further determine variations in protein expression of T. vaginalis, we detected 2 strains of T. vaginalis; the virus-infected ($V^+$) and uninfected ($V^-$) isolates to examine differentially expressed proteins upon TVV infection. Using a stable isotope N-terminal labeling strategy (iTRAQ) on soluble fractions to analyze proteomes, we identified 293 proteins, of which 50 were altered in $V^+$ compared with $V^-$ isolates. The results showed that the expression of 29 proteins was increased, and 21 proteins decreased in $V^+$ isolates. These differentially expressed proteins can be classified into 4 categories: ribosomal proteins, metabolic enzymes, heat shock proteins, and putative uncharacterized proteins. Quantitative PCR was used to detect 4 metabolic processes proteins: glycogen phosphorylase, malate dehydrogenase, triosephosphate isomerase, and glucose-6-phosphate isomerase, which were differentially expressed in $V^+$ and $V^-$ isolates. Our findings suggest that mRNA levels of these genes were consistent with protein expression levels. This study was the first which analyzed protein expression variations upon TVV infection. These observations will provide a basis for future studies concerning the possible roles of these proteins in host-parasite interactions.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.13 no.3
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• pp.109-117
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• 1999

In this paper, improved lamp type ownizer( ILO ), which utilizes the superposition of lamp type ownizer( LO ) and surface discharge operation, is designoo and manufactured for the purpose of characteristic improverrent of an LO employoo for installation of environrrent improverrent and good health using Ultraviolet(U.V.) photochemical reactions Irethoc1s. The ownizer consists of 2 types( LO and ILO ), and owne concentration, owne generation and owne yield were investigated in accordance with discharge power and quantity of suwlioo gas. The results of owne concentration, owne generation and owne yield were ILO > LO. So, owne generation characteristics of the lamp type ownizer were improved. At a discharge power of 19[W], owne concentration, owne generation, and owne yield of the ILO are each improvoo than LO 124[%] at the gas flow $1[\ell/min]$ and 143[%] at the gas flow $1[\ell/min]$. The maximum values of owne concentration, owne generation and owne yield were found as 712[ppm], 128[mg/h] and 6750[mg/kWh] respectively.tively.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.9
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• pp.1993-1999
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• 2011

This paper describes a design of area-efficient/low-power cryptographic processor for HIGHT block cipher algorithm, which was approved as standard of cryptographic algorithm by KATS(Korean Agency for Technology and Standards) and ISO/IEC. The HIGHT algorithm, which is suitable for ubiquitous computing devices such as a sensor in USN or a RFID tag, encrypts a 64-bit data block with a 128-bit cipher key to make a 64-bit cipher text, and vice versa. For area-efficient and low-power implementation, we optimize round transform block and key scheduler to share hardware resources for encryption and decryption. The HIGHT64 core synthesized using a 0.35-${\mu}m$ CMOS cell library consists of 3,226 gates, and the estimated throughput is 150-Mbps with 80-MHz@2.5-V clock.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.11
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• pp.2517-2524
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• 2012

This paper describes an efficient implementation of KS(Korea Standards) block cipher algorithm ARIA. The ARIA crypto-processor supports three master key lengths of 128/192/256-bit and four modes of operation including ECB, CBC, OFB and CTR. A hardware sharing technique, which shares round function in encryption/decryption with key initialization, is employed to reduce hardware complexity. It reduces about 20% of gate counts when compared with straightforward implementation. The ARIA crypto-processor is verified by FPGA implementation, and synthesized with a $0.13-{\mu}m$ CMOS cell library. It has 46,100 gates on an area of $684-{\mu}m{\times}684-{\mu}m$ and the estimated throughput is about 1.28 Gbps at 200 MHz@1.2V.