• Title/Summary/Keyword: RI

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Simultaneous analysis of sugars by HPLC (HPLC를 이용한 당류의 동시분석법)

  • 허부홍;서형석;김성문;김영진;조종후
    • Korean Journal of Veterinary Service
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    • v.23 no.2
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    • pp.137-142
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    • 2000
  • In order to develop a good separation and simultaneous analysis of different sugar in an artificial mixed sugar solution, we analyzed 10 sugar components in an artificial mixed sugar solution composed of fructose, glucose, mannitol, sucrose, maltose, lactose, xylose, xylitol erythritol, and trehalose with using HPLC-ELSD or HPLC-RI. Separation and quantification by HPLC-ELSD was superior to those by HPLC-RI and detection sensitivity by HPLC-ELSD was higher then that by HPLC-RI as micorgram($\mu\textrm{g}$) level. 1. The units of minimal detectable limits were showed $\mu\textrm{g}$/$m\ell$ and ng/$m\ell$ by the HPLC-RI and HPLC-ELSD, respectively. 2. The condition of ELSD was drift tube temperature $82^{\circ}C$, $N_2$ gas flow rate 2.10 SLPM, and colum oven temperature $30^{\circ}C$, respectively. Isolation and recovery rates of single sugar from the multiple sugar solution was higher at the condition (time: flow rate: D.W.:ACN MeOH, min : $m\ell$/min:v:v:v) of linear gradient elution of mobile phase as 0 : 1.00 : 15 : 85 : 0.1 : 1.00 : 6 : 90 : 4, 17 : 1.00 : 10 : 70 : 20, 28 : 1.00 : 15 : 85 : 0 an 35 : 1.00 : 15 : 85 : 0, in order.

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Demand response modification factor for the investigation of inelastic response of base isolated structures

  • Cheraghi, Rashid Eddin;Izadifarda, Ramezan Ali
    • Earthquakes and Structures
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    • v.5 no.1
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    • pp.23-48
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    • 2013
  • In this study, the effect of flexibility of superstructures and nonlinear characteristics of LRB (Lead Rubber Bearing) isolator on inelastic response of base isolated structures is investigated. To demonstrate the intensity of damage in superstructures, demand response modification factor without the consideration of damping reduction factor, demand RI, is used and the N2 method is applied to compute this factor. To evaluate the influence of superstructure flexibility on inelastic response of base isolated structures, different steel intermediate moment resisting frames with different heights have been investigated. In lead rubber bearing, the rubber provides flexibility and the lead is the source of damping; variations of aforementioned characteristics are also investigated on inelastic response of superstructures. It is observed that an increase in height of superstructure leads to higher value of demand RI till 4-story frame but afterward this factor remains constant; in other words, an increase in height until 4-story frame causes more damage in the superstructure but after that superstructure's damage is equal to the 4-story frame's. The results demonstrate that the low value of second stiffness (rubber stiffness in LRBs) tends to show a significant decrease in demand RI. Increase in value of characteristic strength (yield strength of the lead in LRBs) leads to decrease in the demand RI.

Establishment of automated manufacturing system for high-purity [18F]Sodium fluoride: 3-year production experience

  • Jung, Soonjae;Kim, Jung Young;Han, Sang Jin;Seo, Youngbeom;Lee, Kyo Chul;Ryu, Young Hoon;Choi, Jae Yong
    • Journal of Radiopharmaceuticals and Molecular Probes
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    • v.5 no.1
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    • pp.48-53
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    • 2019
  • A bone metastasis is an important factor for prognosis and treatment of breast or prostate cancer patients. [$^{18}F$]Sodium fluoride ([$^{18}F$]NaF) is a PET radiopharmaceutical that can detect bone metastasis. Conventional [$^{18}F$]NaF production process included radioactive metal impurities because the product was prepared by adding saline after beam irradiation to $[^{18}O]H_2O$. In this study, we apply the method of removing radionuclidic impurities. To meet the criteria prescribed by GMP in quality control, we designed the custom-made [$^{18}F$]NaF automatic module. The mean radiochemical yield was $82.1{\pm}4.4%$ (n = 32) productions for 3 years) and the total preparation time was 4 min. The final produced [$^{18}F$]NaF solution meets the USP criteria for quality control. Thus, this fully automated system is validated for clinical use.

A Narrative Study on the Experience of Suicide Prevention Program Worker -Focusing on Tong/ri Chiefs Suicide Prevention Gatekeeper Program- (자살예방사업 담당자의 경험에 관한 내러티브 연구 -이·통장 자살예방 게이트키퍼 사업을 중심으로-)

  • Kim, Jung-Yoo
    • Journal of the Korea Convergence Society
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    • v.12 no.3
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    • pp.305-315
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    • 2021
  • The purpose of this study was to explore what program worker' experiences in suicide prevention gatekeeper program using tong/ri Chiefs. Participants were three workers who have been in charge of this program for more than 2 years. A qualitative research method, narrative study, was used. As a result of the study, they started the program with burden and fear. They felt a heavy burden of the internal and external the organization and lack of themselves. However, they were able to continue their work despite these difficulties because of the support of their families, colleagues and tong/ri Chiefs. And, they suggested ways to revitalize suicide prevention gatekeeper program using tong/ri Chiefs.

Simulation-guided design of a target-cooling system for cyclotron-based isotope production

  • Sang Chul Mun;Gyeol Chan Kang;Choong Mo Kang;Jung Young Kim;Kyo Chul Lee;Seyoung Oh
    • Nuclear Engineering and Technology
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    • v.56 no.8
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    • pp.3268-3275
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    • 2024
  • Isotopes are an important aspect of modern medical and scientific research and cyclotron-based isotope production is of particular interest. Cooling devices are required to manage the heat generated by high-energy particle beams to ensure that they can be delivered securely. However, there is considerable scope for further advancements in the design of cooling systems. Therefore, this study uses simulations to investigate the design of innovative cooling systems. Various designs and materials are considered using a variable four-sector collimator and various particle-beam conditions. Thus, new design principles and material and structural optimization strategies are proposed, which can be used to improve the stability and efficiency of isotope production. The results provide insight into technical challenges and may contribute toward advances in medical diagnostics, radiotherapy, and fundamental scientific research. In particular, they can guide the development of isotopebased technologies in nuclear medicine.

RI를 이용한 도로성토계기의 측정신뢰구간 예측 I

  • 전태훈;이석근;황주호;호광일;권정광;전홍배;양세학
    • Proceedings of the Korean Nuclear Society Conference
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    • 1996.05d
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    • pp.147-154
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    • 1996
  • 외국에서는 도로건설시 성토관리용으로 '방사성동위원소(Radioisotope : 이하 RI)를 이용한 습윤밀도 및 함수량 측정장비'가 많이 사용되고 있는 추세이다. 국내에서는 1989년 제정된 건설 기술관리법 감리전문회사건립 등록기준에 밀도\ulcorner함수량 측정기의 보유가 명시되어 있고 시공성 향상 차원에서 도입될 예정이다. 그러나 국내의 토양에 맞게 제작되어지지 않았고 사용상의 방사선 관련 제약 때문에 기대만큼 실제 사용이 되지 않고 있다.$^{(1)}$ 연구발표내용은 국내에서 제작, 실험하여 만들 RI계기개발의 기초가 되는 내용이며, 만들어질 계기의 부품과 계산과정 등을 예측하는 것이다.

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Marine algal flora of Oho-ri, Gosung-gun, Gangwon-do, Korea

  • Bae, Eun Hee;Oak, Jung Hyun;Lee, Eun-Young
    • Journal of Species Research
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    • v.3 no.1
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    • pp.79-94
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    • 2014
  • It was found that a total of 94 species of marine algae, 13 green algae, 24 brown algae, and 57 red algae, are living at the seashore of Oho-ri in this study. 739 voucher specimens for 94 species were made based on plants from March to September 2010 at the 3 islets, including Heukdo, Goraebawi, and Juckdo. Voucher specimens were catalogued and deposited in the herbarium of the National Institute of Biological Resources (KB) of Korea.

VTSO 관점에서의 선박 충돌위험도 평가모델(CoRi)를 이용한 소형선박의 충돌위험도 평가·분석

  • Lee, Jin-Seok;Kim, Myeong-Hak;Song, Jae-Uk
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2018.05a
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    • pp.284-285
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    • 2018
  • 본 연구에서는 VTSO 관점에서 선박 충돌위험도 평가모델(CoRi)을 이용하여 부산항 관제구역내에서 발생한 일반 상선간 준사고 사례에 대한 충돌 위험도와 선종과 선박의 크기를 소형선박(유선 도선 어선 등)으로 가정할 경우 계산된 충돌 위험도를 비교함으로써 VTSO가 일반 상선과 다른 운항 특성을 가진 소형선박의 모니터링 및 충돌 위험 판단의 어려움을 수치적으로 분석 연구고자 한다.

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Gas Chromstographic Analysis of Hydrocarbons in Atmospheric Air around Odae and Ocheon Area (울산군 오대오천부락 근처의 대기 중 탄화수소성분의 가스크로마토그래피에 의한 분석)

  • 양성봉;김영태
    • Journal of Environmental Science International
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    • v.3 no.4
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    • pp.373-380
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    • 1994
  • Volatile organic compounds in the ambient air were gathered irregularly by normal temperature concentrating method at Odea-ri and Oceon-ri Ulsan-gun in the neighbourhood of Ulsan Petrochemical Industrial Complex and analyzed with gas chromatograph. Several hydrocarbons in common aklospheric air or emitted fugitively from the chemical plants were identified and quantified by comparison with the retention times of standard compounds. The results from several field surveys in 1992 show that the concentrations of styrene at residential area of Odea-ri and Ocheon-ri were less than 0.4 ppm, but once a while greater within the chemical plants area. When it smelled unpleasantly in these area, the concentration of hydrocarbons were also high. It was concluded that the close and long-term investigation about other odorous components but hydrocarbons will be necessary to ascertain the cause of unpleasant odor of these area.

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Discussion on the Quaternary fault movement at Yugye-ri area in the northern part of Yangsan Fault (양산단층 북부 유리계 일대의 신기 단층운동 소고)

  • 경재복
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2001.04a
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    • pp.66-73
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    • 2001
  • Yangsan fault in the southeastern part of Korean peninsula has been locally reactivated along a prexisted fault during the late Pleistocene time. Geomorphological evidence of the reactivation is revealed at the northern segment(Yugye-ri, Tosung-ri areas) of the Yangsan fault. The reactivation is distinctively characterized by fault gouge and fracture zone with high frequency in the Yugye-ri area. Obique slip separation of the area is about three meters of the middle terrace. The cumulative vertical displacement is recognized after the formation of the middle terrace. Age of the reactivated faulting is constrained to during the formation of dissected valley deposits. Average vertical slip based on paleo-event is inferred to about 0.5-0.7 meter in this area.

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