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尿素樹脂에 沈漬한 紙類의 熱 및 放射 處理에 關한 硏究
孟琦錫,安明來,韓舜敎 忠南大學校 1972 論文集 Vol.11 No.-
Syrup state resin of dimethylol urea from urea and formaline was prepared. Papers such as filter paper and korean paper (Han-jee) were soaked in resin as a function of time, temperature and the concentration of catalyzer. The physical properties of the soaked papers such as tensile strength, bursting strength, wet strength and air porosity were tested and observed. There results were compared with the results from the radiation treatment.
김형일,김종렬,안호경,장명익,설효정,김교한 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.2
The age-hardening behavior of a commercial dental casting low-carat gold alloy was investigated by means of differential thermal analysis, hardness test, optical microscopic observation and X-ray diffraction study. The following results were obtained. 1. By the isothermal aging of this alloy at 300∼400℃, the hardness increased markedly at the initial stage and continued to increased gradually for the time, and then decreased dractically after longer aging time. 2. The hardening was attributed to the formation of the metastable AuCu I' ordered phase from the α matrix. 3. The overaging with softening was attributed to the precipitation of the fine lamellar structure which was composed of the Ag-rich α1 and AuCu I ordered phases.
超音波 探傷法에 依한 熔接部의 缺陷높이 測定에 관한 硏究
安逸榮,韓應敎,林東圭 韓國非破壞檢査學會 1982 한국비파괴검사학회지 Vol.2 No.1
This study was carried out to measure the flaw height of welds in consideration of the effective probe angle in ultrasonic oblique detection. Specimens with inserted artificial flaws were made and flaw heights were estimated from detecting these specimens. Two different methods were applied to estimate flaw heights. From the result of the experiment, flaw height could be measured within the accuracy of 15% percent error and the difference between the probe distance method and beam path method is about 5% relatively small. It is considered that the results obtained this experimental study could be helpful informations for measuring flaw height.
Ahn, Dong-Kuk,Kim, Kyo-Han,Yang, Eun-Kyung,Kim, Hyung-Jin,Park, Jae-Sik,Lee, Won-Jung The Official Publication of Korean Academy of Oral 1996 International Journal of Oral Biology Vol.20 No.1
This study was performed to investigate the mechanisms of the nucleus tractus solitarius (NTS)-induced pain modulation in the orofacial area and a possible interrelationship between the antinociceptive and cardiovascular responses in rats. After 15 nM glutamate or 160 pM acetylcholine was microinjected into the NTS, arterial pressure was decreased in 57±3 and 45±2 mmHg, and heart rate was also decreased in 78±7 and 33±4 beats/min, respectively. Digastric electromyogram (dEMG) evoked by noxious electrical stimulation in the palatal mucosa was suppressed by the NTS application of glutamate to 20±4% of the control. However, aCSF and acetylcholine did not affect the dEMG. Pentolinium blocked the depressor response resulting from the microinjection of 15 nM glutamate into the NTS, but had no significant effect on the suppression of dEMG response to NTS stimulation. Methysergide and phentolamine, but not naloxone, significantly inhibited the suppression of dEMG response to microinjection of glutamate into the NTS. These results suggest that the NTS is effective in the modulation of nociceptive transmission in orofacial area and have an interrelationship between antinociception and cardiovascular responses. The NTS-induced antinociception seems to be mediated by serotonergic and adrenergic pathways but not by opioid pathway.
Automated Non-Volatile Radionuclide Separation System for Prompt Analysis of LILWs
Han-byeol Kim,Dae-hee Kim,Hyun-soo Kim,Sun-min Park,Jong-kwang Lee,Hong Joo Ahn,Taeyong Noh,Seoung-kyo Yoo 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1
According to Article 4 and 5 of the Nuclear Safety and Security Commission (NSSC) Notice No. 2020-6, radioactive waste packages should be classified by radioactive levels, and finally permanently shipped to underground or surface disposal facilities. The level of the radioactive waste package is determined based on the concentrations of the radionuclides suggested in Article 8 of NSSC Notice No. 2021-26. Since most of the radionuclides in radioactive wastes are beta nuclides, chemical separation and quantification of the target nuclides are essential. Conventional methods to classify chemically non-volatile radionuclides such as Tc-99, Sr-90, Nb- 94, Fe-55 take a lot of time (about 5 days) and have low efficiency. An automated non-volatile nuclide analysis system based on the continuous chemical separation method of radionuclides has been developed to compensate for this disadvantages of the conventional method in this study. The features of the automated non-volatile nuclide separation system are as follows. First, the amount of secondary waste generated during the chemical separation process is very small. That is, by adopting an open-bed resin column method instead of a closed-bed resin column method, additional fittings and connector are unnecessary during the chemical separation. In addition, because the peristaltic pump is supplied for the sample and solution respectively, it is great effective to prevent cross-contamination between radioactive samples and the acid stock solution for analysis. Second, the factors that may affect results, such as solution amount, operating time and flow rate, are almost constant. By mechanically controlling the flow rate precisely, the operating time and additional factors required during the separation process can be adjusted and predicted in advance, and the uncertainty of the chemical separation process can be significantly reduced. Finally, it is highly usable not only in the continuous separation process but also in the individual separation process. It can be applied to the individual separation process because the user can set the individual sequence using the program. As a result of the performance evaluation of the automation system, recovery rates of about 80–90% and reproducibility within 5% were secured for all of the radionuclides. Furthermore, it was confirmed that the actual work time was reduced by more than 50% compared to the previous manual method. (It was confirmed that the operation time required during the separation process was reduced from 6 days to 3 days.) Based on these results, the automation system is expected to improve the safety of workers in radiation exposure, reduce human error, and improve data reliability.
태양광-전력저장장치 연계운영의 최대부하 이동에 관한 연구
안교상(Kyo-Sang Ahn),김경환(Kyeong-Hwan Kim),한경태(Kyung-Tai Han),정순열(Soon-Yeol Jeong),황우현(Woo-Hyun Hwang) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
전력계통의 전력부하 상태는 일일 혹은 계절별로 다양한 형태를 보여주고 있다. 산업의 발전과 더블어 생활문화의 향상은 전기에너지 소비의 촉진을 가져오고 사용되는 전력부하는 다양한 패턴으로 최대-최저부하의 곡선을 그리며, 전력계통 운영에 직/간접적으로 영향을 주고 있다. 이에 본 고에서는 청정한 발전전원인 태양광발전과 전력저장장치를 적용하여 최대전력부하 이동에 따른 전력회사 혹은 소비자 측면에서 운영에 따른 특성과 계통의 영향에 대하여 논하고자 한다.