Effects of Stressed and Unstressed Reinforcements on Prestressed Concrete Members with Unbonded Tendons

Moon, Jeong-Ho,Shin, Kyung-Jae,Lim, Jae-Hyung,Lee, Sun-Hwa Korea Concrete Institute 2000 KCI concrete journal Vol.12 No.1

The research purpose of this paper is to investigate the influential Parameters on the unbonded tendon stress. The parameters were the reinforcing ratio, the prestressing ratio, and the loading type. To this end. first, the influence of parameters were examined with twenty eight test results obtained from references. Then, an experimental study was carried out with nine specimens. Test variables were the reinforcing ratio and the prestressing ratio. Specimens were divided equally into three groups and each group had a different level of the reinforcing ratio. Each specimen within a group has a different level of the prestressing ratio. The investigation with previous and current tests revealed the followings; (1) the length of crack distribution zone does not have a close relation with the length of plastic hinge. (2) the prestressing ratio does not affect both the length of crack distribution and the length of plastic hinge, (3) the tendon stress variation is in reverse relation with the ratios of mild steels and tendons, (4) the loading type nay not affect significantly the length of crack distribution zone, (5) AASHTO LRFD Code equation and Moon/Lim's design equation predicted the test results well with some safety margins.

디지털 치료기술 산업 육성에 따른 투자와 경제적 파급효과

김재현 ( Jae-hyun Kim ),문종윤 ( Jong Youn Moon ),장지은 ( Jieun Jang ),심정연 ( Jung Yeon Sim ),신재용 ( Jaeyong Shin ) 한국보건행정학회 2020 보건행정학회지 Vol.30 No.4

The digital treatment technology industry is one of the core fostering industries of the Moon Jae-in government along with the global trend. The purpose of this study is to compare and analyze the investment and economic ripple effect on the related industries. To this end, we used the industry-related table, which is the actual measurement data for 2015 that the Bank of Korea actually measured and released every 5 years in 2019. The digital treatment technology industry was not clearly classified within Korea’s industrial classification system, so the contents of the industry-related survey were analyzed, and the digital treatment technology industry was reclassified and then analyzed. As a result of the analysis, it was analyzed that the production induction effect of the digital treatment technology-related industry in 2015 was 1.770, the value-added induction effect was 0.875, and the employment induction effect was 19.128, which was higher than that of other industries in Korea. As a result of the analysis of the economic ripple effect (scenario 1), the production inducing effect was about 370 billion won, the added value inducing effect was about 185 billion won, and the employment inducing effect was 4,044 people. The results of this study are expected to play a large role in economic revitalization as the effect of inducing production, increasing employment, and creating added value through fostering the digital treatment technology industry is expected to play a large role in activating the economy. It is expected to play a large role in providing central medical services. Therefore, it is expected that policy support for revitalizing the digital treatment technology industry through active investment support and tax benefits from the government to foster the digital treatment technology industry is necessary.

심상성 루프스에서 Nested-Primer Gene Amplification Assay에 의한 결핵균 DNA의 검출

신문석,전효진,김병천,이규석,김재룡,권호준,송준영 啓明大學校 醫科大學 1994 계명의대학술지 Vol.13 No.4

Lupus vulgaris, which is a progressive form of postprimary tuberculosis in patients with a moderate to high degree of immunity and tuberculin sensitivity, is the most common, most serious, and most variable type of cutaneous and mucous membrane tuberculosis. Domonstration of M.tuberculosis directly or in culture in some of these eruptions can be difficult. It is essential to demonstrate the presence of M.tuberculosis in a clinical sample for a definitive diagnosis of tuberculosis. With the discovery of the polymerase chain reaction (PCR), the DNA diagnostic approach for infection has developed in a short period. With the dual purpose of definitive and rapid diagnosis of tuberculosis, this study examined the usefulness of a nested PCR for detection of M. turberculosis. Compared with a single-step PCR, the two-step PCR was able to enhance sensitivity approximately 1,000-fold on the basis of bacterial counts and DNA quantity. We concluded that two-step nested PCR appeared to be the most useful PCR protocol for early and sensitive diagnostic method detecting M.tuberculosis in acid-fast stain negative specimens.

IMT-2000용 수신단 One-chip MMIC의 설계 및 제작

신상문,권태운,최재하 울산대학교 2002 공학연구논문집 Vol.33 No.1

본 논문은 IMT-2000용 수신단 One-chip MMIC의 설계 및 제작에 관한 것이다. LNA, 이중 평형 믹서, LO 발룬, RF 발룬, 그리고 IF 증폭기를 하나의 칩에 집적시켰다. 새롭게 제안된 바이어스 회로는 공정상의 변화와 온도의 변화 등의 원인에 의한 문턱전압의 변화를 보상할 수 있다. 제작된 칩의 측정 결과는 모의실험으로 얻은 결과와 일치하지 않는다. LNA는 변환이득이 평탄하게 동작하지 않을 뿐만 아니라 발진현상도 나타났다. 문제에 대한 분석을 통해 원인을 찾았으며, 이 결과는 향후 연구에 사용하려고 한다. 믹서의 변환손실은 -14㏈, IP3는 4㏈m, 포트간 격리도는 25㏈ 이상인 특성을 나타낸다. 설계된 칩은 ETRI MESFET 0.5 ㎛공정으로 제작하였으며 칩 사이즈는 1.4㎜×1.4㎜이다 This is paper describes a design and fabrication of a one-chip receiver MMIC for IMT-2000. The LNA, double balanced mixer, LO balun, RF balun, IF amplifier and a bias circuit are integrated a chip. Each balun operates active and composed of MESFETs. The new applied bias circuit is able to compensate the variation of the threshold voltage caused by the process variation, temperature changes, and etc. The measured response of the fabricated chip doesn't correspond with the simulated performance, the LNA is not only the conversion gain doesn't operates flatly, but also even the oscillation presented. By the study of the cause about the problem, the factor was found. And the result will be deal with further study. The mixer achieves the conversion losses of -14㏈, IP3 of 4㏈m, and port to port isolation over 25㏈. The designed chip is fabricated by the ETRI MESFET 0.5㎛ process. The chip size is 1.4m×1.4m.

두부외상에 의한 미만성 축삭손상의 임상적 병리학적 관찰

신영귀,이민철,이영직,박창수,김재휴,박문선 대한신경외과학회 1997 Journal of Korean neurosurgical society Vol.26 No.6

기하광학영역에서의 능동소나 표적신호합성

신기철,박재은,김재수,최상문,김우식 한국해양대학교 해양과학기술연구소 2001 硏究論文集 Vol.10 No.1

능동소나 시스템에서 표적신호의 근거리 정보가 중요해짐에 따라, 표적 음향산란 신호의 고유한특성을 분석하기 위해 실험적인 방법과 시뮬레이션 기법이 사용된다. 본 논문에서는 표적신호 합성을 위해 축소표적 반향실험을 수행하였고, 자료의 분석 결과 축소표적의 음향산란은 거울면 반사의 영향이 큰 것으로 분석되어, 표적신호 합성에서 기하광학이론을 응용하였다. 복잡한 형태의 표적을 여러 표본형상으로 분리하고, 각 표본형상의 기여도를 신호의 위상과 강도를 줌으로써 계산하였으며. 표적신호 합성모델의 검증을 위해 실제 축소표적 실험 결과와 비교하였다. 혁심용어: 기하광학이론. 음향산란, 거울면반사. 축소표적, 능동소나 투고분야: 수중음향 분야 (5.2) Since the near field iformation of target signal is important in the development and verification of active sonar system experimental method and simulation technique are widely used in order to analyze the detail characteristics of target scattered echoes. Therefore, in this paper, the scale target experiment is performed to develope and improve the target signal simulation model. Since the experimental results show that the specular reflection is the major component among scattering mechanisms, the target signal simulation model based on the Geometric Optics Theory (GOT) is developed. Complex target is separated into simple shapes, known as canonical shape. The contribution from individual canonical shapes are summed with proper phase and amplitude to produse the target strength of the whole complex body. Simulated target signal is compared with the experimental results fed discussed.

하구둑 축조에 따른 흐름특성에 관한 연구

신문섭,이동주,김재형 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

The tidal flow regime at the shallow sea area is usually decided by topographical factors, such as forms of shorelines, bottom topography, channel, sand bar or tidal flat, etc. This study is on the Keum River Estuary, which appears exactly phenomenons of tide caused by complicated topographical changes, and it is inquired out or not change of depth and current on numerical experiments before and after constructed estuary dike.

곁순의 화학적 방제가 연초식물의 생장량에 미치는 영향

이재흥,석영선,신주식,정찬문 충북대학교 엽연초연구소 2001 煙草硏究 Vol.18 No.-

This study was carried out to compare the effects of suckercides - Fatty alcohol(FA), Maleic hydrazide(MH) and Butralin - on the sucker control and growing characters of flue-cured tobacco leaves. Among the three suckercides, Butralin was treated at three different times, one day before topping, topping day and one day after topping, and at two different concentration, 1/30 and 1/60 water solution. The results are summarized as follows. Suckercide treated plot showed higher growth and weight of upper leaves than not-treated plots did. MH treated plot decreased numbers, fresh weight and dry weight of suckers compared to the other treated plots, and made the leaves shape narrow. The effect of Butralin on sucker control was lower than that of MH, but higher than that of FA. The yields when treated Butralin decreased compared to the yields when treated MH. Though there were no significant differences of yields and growing characters of leaves among the plots of three concentrations and two times of treating Butralin, it is recommended to apply 1/60 water solution of Butralin at topping time.

Ni-Zn-Fe₂O₄의 조성비에 따른 전파흡수특성에 관한 연구

조재원,신용진,조치현,문현욱 明知大學校 産業技術硏究所 1993 産業技術硏究所論文集 Vol.12 No.-

This paper describes a study on absorption properties of electromagnetic wave for the composition ratio of Ni-Zn-Fe₂O₄ Ni-Zn-Fe₂O₄was composed of 48∼51mo1% Fe₂O₃,18~22mol% NiO and 27∼34mo1% ZnO. The sintering of the composition was carried out at 1200℃ for 2 hours. Through the experiments, it was found that the resonance phenomenon occured at low frequency range for high permeability and vice versa. In the case .of the composition of 49mo1% Fe₂O₃,20mo1% NiO and 31mo1% ZnO, the bandwidth ranged from 0. 37GHz to 0.95GHz with the absorption thickness of 10mm. Also, In the case of the composition 51mo1% Fe₂O₃, 22mo1% NiO and 27mo1% ZnO. the bandwidth ranged from 0.45GHz to 1.2GHz with the absorbtion thickness of 6mm. Therefore, it is proved that electromagnetic wave absorbers can be fabricated successfully within the bandwidth range mentioned above.

간세포암과 감별이 어려웠던 악성중피종 치험 1예

김선문,허원석,채경훈,강윤세,정재훈,김연수,박기오,문희석,이엄석,김석현,성재규,이병석,이헌영,신경숙,조준식,송인상,강대영 충남대학교 의학연구소 2003 충남의대잡지 Vol.30 No.2

Malignant peritoneal mesothelioma is a rare neoplasm that arises from the mesothelium of a serosal cavity and is a rapidly fatal disease with a median survival of 4 to 12 months for untreated cases. Recently, we experienced a case with malignant peritoneal mesothelioma who was suspected hepatocelluar carcioma by abdominal CT scan and was confirmed by biopsy including immunohistochemical stain(calretinin) after surgery. We performed tumor excisions and wedge resection of the liver(segment Ⅷ)and inserted Tencoff catheter in abdominal cavity at 25th day of post-operation. We treated with intraperitoneal paclitaxel(25mg/m^(2)/day for 5 days) six courses monthly. She was well tolerable and is still living without any evidence of recurrence for 14th month of post-operation.