액체소듐속에서 소듐-물반응에 의한 재질의 Wastage현상

정경채,정지영,김병호,김태준,최병해,최종현,김의식 한국공업화학회 2003 응용화학 Vol.7 No.1

In this study we observed and analyzed the corrosion phenomena in leak site and the effect on temperature at the target surface of heat transfer tube material by sodium-water reaction through water leakage in liquid sodium atmosphere. Surrounding of leak hole of the specimen was damaged by the wastage phenomena due to corrosion and erosion of material, and hole size by damage of leak site was extended from 150㎛ to about 200㎛. Also, the damaged size appeared in the target surface was observed to about 1000㎛ diameter. The temperature of target surface increased about 70~80℃ by the heat of sodium-water reaction even with the small leakage of 15㎖ water. From the results of EPMA and EDX analysis, damaged area are found to covered with complex compounds such as (NaOH+Na_2O) FexOy or (NaCrO_2+nA_2CrO4) mixed up with the sodium oxides by sodium-water reaction and the Fe or Cr element by matrix of tube sodium oxides by matrix of tube material.

소듐-물 반응사고 중/후반기 계통거동특성 연구

정지영,어재혁,김태준,정경체,김병호,한도희,박남국 한국공업화학회 2004 응용화학 Vol.8 No.1

In order to investigate the later phase of a sodium-water reaction (SWR) event in KALIMER (Korea Advanced Liquid MEtal Reactor), the code SELPSTA (Sodium-water reaction Event Later Phase System Transient Analyzer) has been developed and an experimeantal study has been carried out for verification of the simple analysis model applied to the code. The 24 data set obtained in the experiment have been pre-analyzed. Comparison of SELPSTA results with experimental data shows fairly good agreement in the transient.

나트륨-수증기 반응에 대한 실험적 연구

정지영,정경채,김병호,김태준,최종현,박남국 한국공업화학회 2002 응용화학 Vol.6 No.2

An experimental study for the investigation of the sodium-steam reaction phenomena was carried out. No significant aggressive explosion phenomena were observed as compared with that of sodium-water reactions. It was also observed that the rate of increase of reaction temperature decreases with increasing initial temperature of liquid sodium and that the temperature of the target depends upon the flow rate of injected steam.

웨이브렛 변환을 이용한 대뇌출혈성 병변 추출

정유정,강경아,정채영 조선대학교 전자정보통신연구소 2000 電子情報通信硏究所論文誌 Vol.3 No.1

High performance of hardware make progress communication technology and image processing using computer In operation study which processing medical image in the medical part In this paper, proposed algorithm that amplitude of a boundary line case in point high frequency is bigger boundary of noise, discriminate between boundary line and noise Feature is extracted from Intracranial Hemorrhagic Lesion using wavelet transform that is progressed performance of noise remove than any method

나트륨-물 반응 사고 중/후반기 거동특성 연구

정지영,어재혁,정경채,김병호,김종만,김태준,박남국 한국공업화학회 2003 응용화학 Vol.7 No.1

Generally, the analysis of a sodium-water reaction (SWR) is classified by two major events. One is the very initial stage of peak pressure and shock wave propagation caused by the reaction itself, and the other is the bulk motion including the mass transfer phase in the quasi-steady state of the reaction period during several second or minute orders after leak initiation. The system dynamic response during a sodium-water reaction event shows very different characteristics between the initial stage and the long-term period. In order to investigate the later phase of a SWR event. the code SELPSTA (Sodium-water reaction Event Later Phase System Transient Analyzer) has been developed and the desing and construction of the test facility has been made.

STZ 유발 당뇨쥐에서 시간에 따른 생리적 항산화계의 변화

이순재,양정아,김성옥,최정화,신주영,채영미,차복경 대구효성가톨릭대학교 응용과학연구소 1997 응용과학연구논문집 Vol.5 No.-

The purpose of this study was to investigate change of physiological antioxidative system according to the time in streptozotocin-induced diabetic rats. Sprague-Dawley male rats weighing 150±10gm were randomly assigned to one normal and five STZ-induced diabetic groups. Diabetic groups were classified to experimental period. Diabetes was experimentally induced by intravenous injection of 55 mg/kg of body weight of STZ in citrate buffer(PH 4.3) after 6 weeks feeding of three experimental diets. Animals were sacrificed at 0, 3, 6, 12, 18th days of diabetic states. 1. Activity of superoxide dismutase(SOD) in liver was increased in that of diabetic mellitus(DM) groups at 3th day but that of DM groups was not significant from 6th day according to period. Glutathion peroxidase(GPX) was significantly decreased in DM groups from 6th day 2. Reduced glutathione(GSH) contents in liver significantly decreased in diabetic groups from 3rd day compared with those of DM groups according to the period. Oxidized glutathione(GSSG) was higher from 6th day. GSH/GSSG ratio was significantly lower than that of normal group from 3rd day to all experimental period 3. Contents of vitamin E in liver of DM groups were significantly decreased compared with that of normal group from 6th day. 4. Lipid peroxide(LPO) contents in liver of DM groups were significantly increased compared with that of normal group from 3rd day. The present results indicate that STZ-induced diabetic rats were reduced by antioxidative defense system and taken by peroxidate damage in tissue compared with normal group from 3rd day or 6rd day after injection STZ. It lended to acceleration all diabetic groups but no significance according to the experimental time.

좋은 죽음의 개념 분석

이경주,황경혜,라정란,홍정아,박재순 가톨릭대학교 간호대학 호스피스 교육연구소 2006 호스피스논집 Vol.10 No.-

Purpose: Death is not an option but a necessity in our life. However, there is little understanding of what a good death means. This study was conducted to analyze the concept of a good death by exploring attributes, antecedents, consequences and empirical criteria for a good death in literatures. Method : Reviewed materials were collected by searching for web cites such as PubMed, National Library of Korea, National Assembly Library. Walker and Avant's method(2004) was used for this concept analysis. Results : The findings showed that a good death includes seven attributes: dignity (personal respect and privacy), self-control (the right of choice, independence, clear consciousness), comfort (physical, psychological, spiritual). optimal relationships (supportive environment, proper care, restoration of relationships), appropriateness (sequence and proper age of death), preparation for death (completing unsettled tasks, leaving a legacy, positive attitude toward life, awareness and acceptance of death) and minimizing burden. Conclusion : This results will provide health professionals and people with a preliminary understandings of a good death. In addition, there is the need for further study to develop objective measurement of a good death and effective nursing intervention for the dying.

Carbon Contained Ammonium Diuranate Gel Particles Preparation in Mid-process of High-temperature Gas-cooled Reactor Fuel Fabrication

Jeong, Kyung Chai,Cho, Moon Sung Korean Nuclear Society 2016 Nuclear Engineering and Technology Vol.48 No.1

This study investigates the dispersibility of carbon in carbon contained ammonium diuranate (C-ADU) gel particles and the characteristics of C-ADU gel liquid droplets produced by the vibrating nozzle and integrated aging-washing-drying equipment. It was noted that the excellent stability of carbon dispersion was only observed in the C-ADU gel particle that contained carbon black named CB 10. ADU gel liquid droplets containing carbon particles with the excellent sphericity of approximately 1,950 mm were then obtained using an 80-100-Hz vibrating nozzle system. Dried C-ADU gel particles obtained by the aging-washing-drying equipment were thermal decomposed until $500^{\circ}C$ at a rate of $1^{\circ}C/min$ in an air or in 4% $H_2$ gas atmosphere. The thermally decomposed C-ADU gel particles showed 24% weight loss and a more complicated profile than that of ADU gel particles.

Carbon Contained Ammonium Diuranate Gel Particles Preparation in Mid-process of High-temperature Gas-cooled Reactor Fuel Fabrication

Kyung-Chai Jeong,조문성 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.1

This study investigates the dispersibility of carbon in carbon contained ammoniumdiuranate (C-ADU) gel particles and the characteristics of C-ADU gel liquid droplets producedby the vibrating nozzle and integrated agingewashingedrying equipment. It wasnoted that the excellent stability of carbon dispersion was only observed in the C-ADU gelparticle that contained carbon black named CB 10. ADU gel liquid droplets containingcarbon particles with the excellent sphericity of approximately 1,950 mm were then obtainedusing an 80-100-Hz vibrating nozzle system. Dried C-ADU gel particles obtained bythe aging-washing-drying equipment were thermal decomposed until 500℃ at a rate of 1℃/min in an air or in 4% H2 gas atmosphere. The thermally decomposed C-ADU gelparticles showed 24% weight loss and a more complicated profile than that of ADU gelparticles.

ADU Compound Particle Preparation for HTGR Nuclear Fuel in Korea

Kyung Chai Jeong,Sung Chul Oh,Yeon Ku Kim,Young Woo Lee 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.5