• 한국통신학회논문지
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• 제38B권5호
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• pp.377-384
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• 2013

비밀번호 기반의 사용자 인증은 동일한 비밀번호를 반복 사용하므로 보안이 취약하여 OTP(One-Time Password)가 도입되었다. 하지만 보안이 강화된 OTP를 서버와 동기된 모바일 기기에서 생성하여 PC에 입력하는 경우 PC가 악성코드에 감염되어 있으면 해커가 사용자 계정과 비밀번호 그리고 OTP값을 해킹할 수 있다. 본 논문에서는 OTP값 유출에 따른 보안 취약성을 해소하기 위해 사용자는 계정과 비밀번호를 PC에 입력하여 서버인증을 수행하고, PC 화면에 출력된 QR코드를 모바일 기기에서 스캔하여 OTP값을 직접 서버로 전송함으로써 정보 유출에 따른 해킹을 방지하고 PC에 OTP값을 입력하는 불편함을 줄이는 새로운 이중 인증 방식인 DTOTP를 제안한다. 시스템은 이중 전송을 통해 PC인증 방식의 OTP 보다 향상된 보안성을 제공하면서 기존 OTP 알고리즘을 그대로 사용할 수 있어 구현이 용이하며 은행, 포털 및 게임 서비스 등에 안전하게 활용할 수 있다.

• Clinical and Experimental Reproductive Medicine
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• 제47권4호
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• pp.306-311
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• 2020

Objective: The aim of this study was to determine whether co-administration of a gonadotropin-releasing hormone (GnRH) agonist and human chorionic gonadotropin (hCG) for final oocyte maturation improved mature oocyte cryopreservation outcomes in young women with decreased ovarian reserve (DOR) compared with hCG alone. Methods: Between January 2016 and August 2019, controlled ovarian stimulation (COS) cycles in women (aged ≤35 years, anti-Müllerian hormone [AMH] <1.2 ng/mL) who underwent elective oocyte cryopreservation for fertility preservation were retrospectively analyzed. Results: A total of 76 COS cycles were triggered with a GnRH agonist and hCG (the dual group) or hCG alone (the hCG group). The mean age and serum AMH levels were comparable between the two groups. The duration of stimulation, total dose of follicle-stimulating hormone used, and total number of oocytes retrieved were similar. However, the number of mature oocytes retrieved and the oocyte maturation rate were significantly higher in the dual group than in the hCG group (p=0.010 and p<0.001). After controlling for confounders, the dual-trigger method remained a significant factor related to the number of mature oocytes retrieved (p=0.016). Conclusion: We showed improved mature oocyte collection and maturation rate with the dual triggering of oocyte maturation in young women with DOR. A dual trigger appears to be more beneficial than hCG alone in terms of mature oocyte cryopreservation for young women with DOR.

• 마이크로전자및패키징학회지
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• 제17권4호
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• pp.89-94
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• 2010

Bi 증착원과 Te 증착원의 몰비를 변화시키며 동시증착법으로 Bi-Te 박막을 형성 후, Bi 증착원과 Te 증착원의 몰비에 따른 Bi-Te 박막의 열전특성을 분석하였다. 동시증착법으로 형성한 Bi-Te 박막은 n형 반도체로서, $-60{\sim}-80{\mu}V/K$의 Seebeck 계수를 나타내었다. Bi 증착원의 양이 30 mol%인 조건으로 동시 증착하여 Te 과잉 조성인 박막은 $5{\times}10^{-4}W/m-K^2$의 출력인자를 나타내었으며, Bi 증착원의 양이 90 mol%인 조건으로 동시 증착하여 Bi 과잉 조성인 박막은 $17.7{\times}10^{-4}W/m-K^2$의 출력인자를 나타내었다.

• Animal Bioscience
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• 제36권9호
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• pp.1357-1366
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• 2023

Objective: This study aimed to identify the single-nucleotide polymorphisms (SNPs) in the dual-specificity phosphatase 8 (DUSP8) and insulin-like growth factor 2 (IGF2) genes and to explore their effects on inosine-5'-monophosphate (IMP), inosine, and hypoxanthine contents in Korean native chicken -red-brown line (KNC-R Line). Methods: A total sample of 284 (males, n = 127; females n = 157) and 230 (males, n = 106; females, n = 124) aged of 10 weeks old KNC-R line was used for genotyping of DUSP8 and IGF2 genes, respectively. One SNP (rs313443014 C>T) in DUSP8 gene and two SNPs (rs315806609A/G and rs313810945T/C) in IGF2 gene were used for genotyping by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) and KASP methods, respectively. The Two-way analysis of variance of the R program was used to associate DUSP8 and IGF2 genotypes with nucleotide contents in KNC-R chickens. Results: The DUSP8 (rs313443014 C>T) was polymorphic in KNC-R line and showed three genotypes: CC, CT, and TT. The IGF2 gene (rs315806609A/G and rs313810945T/C) was also polymorphic and had three genotypes per SNP, including GG, AG, and AA for the SNP rs315806609A/G and genotypes: CC, CT, and TT for the SNP rs313810945T/C. Association resulted into a strong significant association (p<0.01) with IMP, inosine, and hypoxanthine. Moreover, the significant effect of sex (p<0.05) on nucleotide content was also observed. Conclusion: The SNPs in the DUSP8 and IGF2 genes might be used as genetic markers in the selection and production of chickens with highly flavored meat.

• 대한가정학회지
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• 제39권9호
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• pp.137-152
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• 2001

On the basis of the equity theory, as the couple perceives their relationship is equitable, they tend to make decisions jointly and are satisfied with their family lives. Therefore this study is aimed to identify the relationship among perception of equity, decision-making styles and family life satisfaction in dual-career couples. As a result of analyzing the cause-effect relationship, it shows that many socioeconomic$.$psychological variables have direct indirect impact on family life satisfaction through medium factor, so this study proves the application of the cause-effect modes. However the influence of the perception of equity of wives were higher than husbands.

• Kyungpook Mathematical Journal
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• 제49권3호
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• pp.493-506
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• 2009

By using the improved Euler-Maclaurin summation formula and estimating the weight coefficients in this paper, a new dual Hardy-Hilbert's inequality and its reverse form are obtained, which are all with two pairs of conjugate exponents (p, q); (r, s) and a independent parameter ${\lambda}$. In addition, some equivalent forms of the inequalities are considered. We also prove that the constant factors in the new inequalities are all the best possible. As a particular case of our results, we obtain the reverse form of a famous Hardy-Hilbert's inequality.

• Journal of Electrical Engineering and Technology
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• 제6권1호
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• pp.133-138
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• 2011

This paper proposes a simple but robust self-tuning fuzzy logic controller for the speed regulation of a dual star induction machine based on indirect field oriented control. For feed the two star of this machine, two voltage source inverters based on sinus-triangular pulse-width modulation techniques are introduced. The simulation results show the robustness and good performance of the proposed controller.

• 경영과학
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• 제11권3호
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• pp.1-11
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• 1994

Recent advances in linear programming solution methodology have focused on interior point methods. This powerful new class of methods achieves significant reductions in computer time for large linear programs and solves problems significantly larger than previously possible. These methods can be examined from points of Fiacco and McCormick's barrier method, Lagrangian duality, Newton's method, and others. This study presents a primal-dual log barrier algorithm of interior point methods for linear programming. The primal-dual log barrier method is currently the most efficient and successful variant of interior point methods. This paper also addresses a Cholesky factorization method of symmetric positive definite matrices arising in interior point methods. A special structure of the matrices, called supernode, is exploited to use computational techniques such as direct addressing and loop-unrolling. Two dense matrix handling techniques are also presented to handle dense columns of the original matrix A. The two techniques may minimize storage requirement for factor matrix L and a smaller number of arithmetic operations in the matrix L computation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 A
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• pp.556-558
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• 1994

This paper proposes a new converter that can reduce the harmonics like conventional 12-pulse dual thyrister converters with the input transformers. Both the bridges are controlled with the shifted firing angle and connected through current sharing reactors. Using the center tapped reactor, the DC link current is controlled with the different two values in order to make the input current waveform 12 pulses.

• JSTS:Journal of Semiconductor Technology and Science
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• 제17권1호
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• pp.101-109
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• 2017

This paper presents a high-throughput low-complexity 512-point eight-parallel mixed-radix multipath delay feedback (MDF) fast Fourier transform (FFT) processor architecture for orthogonal frequency division multiplexing (OFDM) applications. To decrease the number of twiddle factor (TF) multiplications, a mixed-radix $2^4/2^3$ FFT algorithm is adopted. Moreover, a dual-path shared canonical signed digit (CSD) complex constant multiplier using a multi-layer scheme is proposed for reducing the hardware complexity of the TF multiplication. The proposed FFT processor is implemented using TSMC 90-nm CMOS technology. The synthesis results demonstrate that the proposed FFT processor can lead to a 16% reduction in hardware complexity and higher throughput compared to conventional architectures.