• 한국해양공학회지
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• 제12권2호통권28호
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• pp.65-70
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• 1998

In this report, the creep properties and creep life estimation by Larson-Miller Parameter(LMP) Method for 2.25Cr1Mo steel to be used as power plant tubes or other components were presented at the high temperatures of 500, 550, and $600^{\circ}C$. It was confirmed experimentally and quantitatively that a creep life estimation equation at such various high temperatures was well derived by LMP and could be used very effectively within the creep life of 10$^3$ hours, but very unreliable and even dangerous for design in a long term of creep life such as 10$^4$ or $10^5$ hours.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2001년도 춘계학술대회 논문집
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• pp.307-313
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• 2001

In this Paper, friction welding optimization for 1Cr0.5Mo-STS304($\Phi$14mm), AE applications for the weld quality evaluation and the applications of various life prediction methods such as LMP(Larson-Miller Parameter) and ISM(initial strain method) were investigated : the creep behaviors of those steels and the friction welded joints under static load were examined by ISM combined with LMP at 400, 500, 550 and $600^{\circ}C$, and the relationship between these two kinds of phenomena was studied. The real-time predicting equations of elevated-temperature creep life(fracture time) under any creep stress at any elevated- temperature could be developed by LMP and LMP-ISM, It was confirmed that the life prediction equations by LMP and LMP-ISM are effective only up to 10$^2$hrs and can not be used for long times of 10$^3$-10$^{6}$ hrs, but by ISM it can be used for long times creep prediction of more than 10$^4$hrs with most reliability.

• 소성∙가공
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• 제19권7호
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• pp.435-440
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• 2010

The creep life of 9Cr1MoVNb steel, in terms of Larson-Miller parameter(LMP), was evaluated by small punch(SP) creep simulation and verified by uniaxial creep test. By employing the elastoplastic FEM(finite element method), the small punch creep behaviors associated with various friction coefficients were simulated to identify a real friction phenomena. The friction coefficient, ${\mu}$=0.7, determined by comparing deflection history was used in the small punch creep simulation to find the equivalent stresses with which the relationship between punch load and uniaxial creep stress was found. The creep life was then predicted by the LMP, which was the relationship among the rupture time, temperature, and stress. Finally, the LMP calculated by SP-creep simulation was compared with that had computed by the uniaxial creep test and fairly matched LMPs were found.

• Asian Pacific Journal of Cancer Prevention
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• 제15권22호
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• pp.9835-9839
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• 2014

Fisetin is an effective compound extracted from lacquer which has been used in the treatment of various diseases. Preliminary data indicate that it also exerts specific anti-cancer effects. However, the manner in which fisetin regulates cancer growth remains unknown. In this study, we elucidated interference of fisetin with targets of the nuclear factor ${\kappa}B$ signal transduction pathway activated by Epstein-Barr virus encoding latent membrane protein 1 (LMP1)in nasopharyngeal carcinoma (NPC) cells, Results showed that fisetin inhibited the survival rate of CNE-LMP1 cells and NF-${\kappa}B$ activation caused by LMP1. Fisetin also suppressed nuclear translocation of NF-${\kappa}B$ (p65) and $I{\kappa}B{\alpha}$ phosphorylation, while inhibiting CyclinD1, all key targets of the NF-${\kappa}B$ signal transduction pathway. It was suggested that interference effects of fisetin with signal transduction activated by LMP1 encoded by the Epstein-Barr virus may play an important role in its anticancer potential.

• 한국가스학회지
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• 제25권5호
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• pp.30-36
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• 2021

정유 및 석유화학산업의 개질로 튜브에 사용되는 mod HP강에 대한 잔여수명의 예측법을 튜브의 표면 금속조직에 석출된 탄화물의 면적분율에 대한 정량적인 평가를 통해 연구하였다. 표면복제법을 활용한 미세조직 분석을 통하여 탄화물의 면적분율과 잔여수명 사이의 관계를 실험적으로 구하였다. 신재(Virgin)와 950 ℃의 개질로에서 1.8, 6.0, 7.2, 8.5, 9.7 및 16.2년 실제 사용한 튜브들을 광학현미경(OM)을 사용하여 관찰하였으며, 석출물의 면적분율을 Image J 프로그램을 이용한 정량적 이미지 분석에 의해 측정하였다. 석출물의 면적분율이 증가함에 따라 잔여수명이 감소하여 서로 반비례하는 결과를 보여주었다. 이 관계를 사용온도와 수명을 결합한 파라미터인 LMP로 나타내면, 신재에서 LMP 값이 가장 높게 나타났고, 사용시간이 증가할수록 LMP가 감소하여 잔여수명이 줄어 듦을 나타내었다. LMP와 탄화물의 면적분율과의 상관관계를 나타내는 관계식을 도출하였다. 도출한 관계식은 현장에서 잔여수명 평가를 위해 표면복제법 적용으로 면적분율을 측정하여 잔여수명을 평가하는데 사용될 수 있다.

• Journal of Electrical Engineering and Technology
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• 제10권1호
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• pp.109-117
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• 2015

This paper proposes the comparison results of various optimal power flow algorithms (OPF) to calculate the locational marginal prices (LMP) of the unreduced full scale Korean transmission system. Five different types of optimal power flow models are employed: Full AC OPF, Cubic AC OPF, Quadratic AC OPF, Linear AC OPF and DC OPF. As the results, full AC OPF and cubic AC OPF model provides LMP calculation results very similar to each other while the calculation time of cubic AC OPF model is faster than that of the Full AC OPF. Other simplified OPF models, quadratic AC OPF, linear AC OPF and DC OPF offer erroneous results even though the calculation times are much faster than the Full AC OPF and the Cubic AC OPF. Given the condition that the OPF models sometimes fail to find the optimal solution due to the severe complexity of the Korean transmission power system, the Full AC OPF should be used as the primary OPF model while the Cubic AC OPF can be a promising backup OPF model for the LMP calculations and/or real-time operation.

• 생명과학회지
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• 제25권3호
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• pp.269-275
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• 2015

생체에서 가장 많은 비율로 분포하고 있는 콜라겐 펩타이드는 동물의 뼈와 해양 생물의 비늘에 많이 함유되어 있다. 콜라겐은 동물 생체의 여러 결합조직에서 구조 단백질로 흔하게 발견된다. 또한, 이들은 생물 의료 자재, 제약, 화장품, 식품 및 가죽 산업에 널리 이용된다. 각종 어류 비늘에서 추출된 펩타이드는 UVB 조사에 의해 유도된 피부의 손상 및 광 노화에 대한 보호 효과가 있었다. 그럼에도 불구하고, UVB 조사에 대한 옥돔 비늘 유래의 펩타이드 특성은 명확히 알려져 있지 않다. 이 연구에서는 옥돔 비늘 추출물에서 분리된 1 kDa 이상(HMP)과 1 kDa 이하(LMP)의 펩타이드를 이용하여 UVB 조사에 의해 유도된 피부 손상과 광 노화에 대한 효과를 연구하였다. 이들 펩타이드는 농도 의존적으로 DPPH 라디칼 소거능을 보였으며 LMP는 HaCaT 인간 피부세포에서 UVB 조사에 의해 유도된 세포 지질 과산화 산물인 8-isoprostane 생성을 억제하였다. 그리고 LMP와 HMP는 B16F10 마우스 흑색종 세포에서 tyrosinase 활성 및 melanin 함량을 감소시켰으며 또한 HaCaT 세포에서 UVB로 유도된 elastase 활성을 감소시켰고 matrix metalloproteinase-1의 활성을 감소시켰다. 이러한 결과는 옥돔 비늘에서 유래된 펩타이드가 미백효과, 항산화제 및 광 노화 억제제로서 유용한 물질이 될 것으로 기대된다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.153-154
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• 2008

This paper presents a window-based software package for the education and training for the reduction of power system by using locational marginal price (LMP), clustering, and similarity indices of each bus. The developed package consists of three modules: 1) the LMP module, 2) the Clustering module and 3) the Reduction module. Each module has a separated and interactive interface window. First of all, LMPs are created in the LMP module, and then the Clustering module carries out clustering based on the results of the LMP module. Finally, groups created in this Clustering module are reduced by using the similarity indices of each bus. The developed package displays a variety of tables for results of the LMPs of base network, voltages, phases and power flow of reduced network so that the user can easily understand the reduction of network. To demonstrate the performance of the developed package, it is tested for the IEEE 39-bus power system.

• 대한세포병리학회지
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• 제12권2호
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• pp.73-80
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• 2001

The prevalence of Epstein-Barr virus(EBV) in the uterine cervix was investigated to define the possible etiologic role in cervical carcinogenesis. The viral genotyping and LMP-1 30bp deletion were also stooled. The materials included 169 uterine cervical swabs(152 within normal limits, 12 atypical squamous cells of uncertain significance, 3 low grade intraepithelial lesions, and 2 high grade squamous intraepithelial lesion) and 104 uterine cervical tissues obtained from hysterectomy specimens(32 carcinoma in situ, 9 microinvasive squamous cell carcinomas, 37 invasive squamous cell carcinomas, 7 adenocarcinomas, 7 adenosquamous carcinomas, and 12 cervicitis). EBV detected by PCR for EBNA-1 was positive in 52(56.5%) of 92 invasive and noninvasive cervical carcinomas, and 80(48.8%) of 164 inflammatory or normal cervices. The viruses detected in carcinomas were all type A, and LMP-1 30bp deletion form was more frequent in premalignant and malignant cervical lesions than in nonneoplastic cervices. From the above results, it may be concluded that EBV is one of common viruses detected in uterine cervix of Korean women, and type A virus and LMP-1 30bp deletion form may have a role in cervical carcinogenesis.

• 보험의학회지
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• 제2권1호
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• pp.245-252
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• 1985

Ultrasonographic examination in the obstetrics not only makes easy of the diagnosis of Hydrocephalus, placenta previa, anencephalus and ectopic pregnancy, etc, but also guaranteed its excellence in the diagnosis of women gynecology disease. Especially in case that it doesn't affect radiation hazard on the embryo, its efficiency keeps increasing and it is spotlighted to many clinic doctors. Even though in general hospital we often observe congenital hydrocephalus in Med. Dept. which entirly undergoes the medical examination to the insured, we don't observe even the women delivered with child and it is very difficult to find a rare congenital hydrocephlus throughout other present insurance companies. We inspected a congenital hydrocephalus, which other medical equipments of present insurance companies have many difficulties in the medical examination, accompanied by meningoencephalocele by ultrasonic diagnosis. We analyzed and compared the data by ultrasonic diagnosis with that of surgical diagnosis and the results are follows; 1) We could correctly describe meningoencephalocele by ultrasonic diagnosis. 2) It was able to be diagnosed in LMP 22 weeks. 3) BPD has about 10 mm higher than normal value in LMP 22 weeks. 4) Dilatation of lateral ventricle was observed in LMP 22 weeks. 5) As paralled with ultrasonic diagnosis in pregnancy medical examination, accepting declines including the risk rate can be restrained.