Treatment of Radioactive Liquid Waste by the Forced-AirCirculation System

Tae-κuk Kim,IL Sik Kang,Jong-Sik Shon,Young-Gerl Ryu,Won-Hyuk Jang,Sang-Min Bae,Young-Yong Ji,Dae-Seok Hong,Kyung-Kil Kwak 한국방사성폐기물학회 2011 한국방사성폐기물학회 학술논문요약집 Vol.9 No.2

혈중 및 호기 일산화탄소를 이용한 일산화탄소 헤모글로빈 농도간의 관련성 연구

김형수,박태혁,손지언,정갑열,김정만,김준연 동아대학교 2001 大學院論文集 Vol.26 No.-

This study was conducted to find a correlation between blood COHb and calculated COHb with expiratory air and related variables such as occupational and smoking factors. Author selected 69 healthy workers in 8 workplaces suspected CO exposure. Basic informations were collected by self-reported questionnaire and medical history taking. Author measured Indirect COHb concentration with expiratory air using Micro II-Smokerlyzer and blood COHb concentration using Oxymeter. The results of the study were summarized as follows : 1. In the smoker, mean blood COHb and calculated COHb with expiratory air were 2.21±0.98% and 2.27±0.97 %, and there was not a statistically significant difference. In the non-smoker, mean blood COHb and calculated COHb with expiratory air were 0.42±0.43 % and 0,65±0.30 %, and there was also not a statistically significant difference. 2. There were positive correlations between blood COHb and calculated COHb with expiratory air in both the smoker (r=0.91, p=0.0001) and non-smoker (r=0.73, p=0.0001). 3. In the smoker, the factors affected COHb were total smoking index (Pack × years) and passed time after the last smoking. 4. In the nonsmoker, the parking and driving groups had higher COHb concentration than others (p<0.05). In conclusion, there was no significant difference between indirect COHb concentration with expiratory air using Smokerlyzer and blood COHb concentration and there was a highly significant correlation between indirect and blood COHb concentrations. Therefore indirect COHb concentration with expiratory air is a useful screening method for CO exposure. Author suggest the resection of smoking during at least 90 minutes before measuring COHb concentration in order to exclude smoking effects.

하악골에 발생한 골막 골육종

김태우,김승범,권혁찬,문선재,윤정훈,김형준,차인호,육종인,김진 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.1

Periosteal osteosarcoma is a distinct entity of malignant bone tumor with characteristic clinical, morphological, and histological features within the group of juxtacortical osteosarcoma. Periosteal osteosarcoma is predominantly located in the tubular long bones, and extremely rarely involving the jaws. A case of periosteal osteosarcoma of the right mandible is presented. A 27-year-old woman complained of the gingival swelling and bleeding tendency of the right posterior mandible. Clinical examination revealed a reddish brown strawberry-like swelling on the affected mucosa, which measured 1.5㎝×1.5㎝. The tumor was located on the lingual cortex of the mandible and extended into the surrounding soft tissues. Microscopically, the tumor consisted exclusively of atypical chondroblastic cells with a small osteoblastic area. A minimal bone marrow involvement was noted and the adjacent cortex was free of tumor. These findings suggested that the tumor originated from the periosteal cambium layer, which lies between the periosteal fibrous layer and the cortex of mandible.

우리나라 株式市場에서의 月中效果와 그 原因에 대한 實證的 硏究

김태혁,이정곤 釜山大學校 商科大學 1995 釜山商大論集 Vol.66 No.-

The purpose of this study is to examine the existence of monthly effects and to discover the causes of monthly effects in the Korean Stock Market. According to the prior empirical studies, the existence of monthly effect varies largely depending on the selection of trading month. The results from this study show the monthly effect, confirmed by the fact that the mean cumulative return of the last half of calendar month exceeds that of the first half of calendar month, significantly exists in the Korean Stock Market opposed to the U.S. Stock Market. This study also found that the monthly effect is affected by corporate disclosure and is heavily influenced by the turn-of-the month effect. The empirical results found are as follows; First, by selecting calendar month as trading month, the monthly effect appears in the Korean Stock Market. Particularly, the fact that cumulative return for the last half exceeds that for the first half totally differs from the prior empirical results including Ariel's study. Second, January effect may affect the monthly effect, but large stocks show stronger evidence of the monthly effect even after excluding the returns realized during January. That is, large stocks have experienced higher month-end returns for the rest of eleven months Third, the weekend effect does not affect the monthly effect, but timely corporate disclosure appears to major causes of the monthly effect. Finally, this study suggests the optimal investment strategy based on utilizing the monthly effect. According to the cumulative returns for nine(six) trading days, the maximum return can be realized by holding stocks from the last five(four) trading days of the particular trading month to the first four(two) trading days of the next trading month. Therefore, it is recognized that the calendar trading effect are heavily influenced by the turn of the month effect.

활성슬러지 세균에 의한 장바이러스의 제거에 관한 연구

최동혁,우수민,김태동 7개 국립대학교 환경연구 논문집 공동발행 위원회 2003 공업기술연구 Vol.3 No.-

At present, the activated sludge process is claimed to have a high capability of removing viruses if the process is operated properly. In this research, in order to obtain fundamental information needed to establish a new technology for virus removal using microbes in the activated sludge process, the roles played in virus removal by some typical bacteria found in activated sludge basin were inveatigated using poliovirus as model virus. The results showed that the virus in the liquid phase decreased by a reversible absorption phenomenon of the virus to the surface of the bacterial flocs.

상아질에 대한 저점도 복합레진의 자가접착에 관한 연구

조태희,최경규,박상혁,박상진 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.3

The objectiveness of this study was to evaluate whether low-viscosity composite can bond effectively to dentin surface without bonding resin. The low-viscosity composites being 50wt% filler content were made by the inclusion of bonding resin of two self-etching systems(Clearfil SE Bond, Unifil Bond) varied with contents as 0, 10, 20, 30, 40, 50wt%. Exposed dentin surfaces of extracted 3rd molars are used. Dentin bond strengths were measured. The tests were carried out with a micro-shear device placed testing machine at a CHS of 1mm/min after a low-viscosity composite was filled into an iris cut from micro tygon tubind with internal diameter approximately 0.8mm and height of 1.0mm. 1. Flexural strength and modulus was increased with the addition of bonding resin. 2. Micro-shear bond strength to dentin was improved according to content of bonding resin irrespective of applying or not bonding resin in bonding procedure, and that of Clearfil SE Bond groups was higher than Unifil Bond. 3. There were no significant difference whether use of each bonding resin in bonding procedure for S-40, S-50, U-50(p>0.05). 4. In SEM examination, resin was well infiltrated into dentin after primed with self-etching primer only for S-50 and U-50 in spite of the formation of thinner hybrid layer. Low viscosity composite including some functional monomer may be used as dentin bonding resin without an intermediary bonding agent. It makes a simplified bonding procedure and foresees the possibility of self-adhesive restorative material.

LFS를 위한 디스크 배열의 구성

최혁근,장태무 동국대학교 산업기술연구원 1995 산업기술논문집 Vol.6 No.-

디스크 시스템의 입출력 성능을 향상시키기 위한 여러 연구 중 로그 구조화 파일 시스템(LFS : Log-structured File System)과 RAID 등의 디스크 배열 등이 주요한 것들이다. 본 논문에서는 위 두 개념이 결합되었을 때 효율적인 디스크 배열의 구성 방법을 제시한다. 디스크 배열은 LFS에서의 세그먼트 단위의 쓰기 동작을 효율적으로 처리하고, LFS는 쓰기 동작을 보다 크고 연속적인 것으로 만들어서 특히 대표적인 디스크 배열 구성인 RAID5에서 문제가 되는 패리티 갱신 동작을 줄일 수 있다. 그러나 세그먼트의 시작과 끝 부분에서는 여전히 RAID5에서의 문제점은 제거되지 않는다. 본 논문에서는 동적 패리티 방법을 이용하여 위의 문제를 해결하고자 시도하였다. 디스크 배열 제어기는 패리티 배치표를 사용하여 패리티 위치를 동적으로 관리함으로써 패리티 갱신 동작을 제거한다. 이 방법은 비소멸성 기억장치 등의 오버헤드가 있으나 기억장치의 가격 하락 추세에 비추어 큰 문제는 아니라고 판단된다. 시뮬레이션 결과 본 논문에서 제시한 동적 패리티 배치 방식이 종래의 정적인 방법에 비해 대략 20% 정도의 성능을 높일 수 있음을 확인할 수 있었다. There have been various studies to improve the disk I/O performance. Among them, LFS(Log-Structured file System) and disk array such as RAID are the major approaches. In this parer, the relationship between LFS and disk array is discussed. That is : disk array can help to improve the performance of read/write of segments, and LFS can reduce parity-update operations by changing write operations into big and continuous ones. But there is no effect of reducing parity-update operations at the beginning and the end of a segment in LFS. To solve this problem, a dynamic parity method is proposed that generates parity block for data and performs segment writes without parity-update operations. To implement this method, the disk array controller needs a non-volatile parity table to keep parity locations dynamically in disk array. The proposed method is simulated, and the result shows that the method achieves about 20% gains on the performance of segment writes based on the conventional static method.

佛陀가 본 絶對者와 無我說

鄭泰赫 東國大學校 1975 論文集 Vol.14 No.-

도시공간구조에 따른 존별 첨두율 예측모형 연구 : 대구광역시 중존을 중심으로

김태헌,김택근,김기혁 계명대학교 산업기술연구소 1998 産業技術硏究所 論文報告集 Vol.21 No.1

The aim of this research is to find out the characteristics of peak hour rate and to estimate the peak hour by spatial structure and social factors in the urban area The data used to estimate peak rate was based on Taegu city's person trip survey in 1992. Multiple regression analysis have used to develop the prediction equations for the peak hour trip by various types of land use and urban characteristics data.

탄소강의 부식억제제로서 Amine Alcohol의 치환기에 의한 흡착 특성의 영향에 관한 연구

孫太源,閔丙喆,權東赫,金亨培 弘益大學校 科學技術硏究所 1991 科學技術硏究論文集 Vol.1 No.-

The inhibitive effect of monethanolamine, N-methylethanolamine and on carbon steel S.S.41 in the 3.5% NaCl solution has been studied using polarization test method. A significant retardation of corrosion rate was observed in the 3.5% NaCl solution containing the inhibitors. The adsorption characteristic of inhibitor was studied and the adsorption heat(???)was calculated by molecular interaction value f. The results obtained from polarization test method revealed that the efficiency of corrosion inhibition was effected by molecular interactions of adsorption complex on metal surface. Using Frumkin adsorption isotherm, which was most favorable isotherm to the experimental data, molecular interaction of adsorption(f) for MEA, and NMEA on carbon steel surface were calculated to be -8.77, and -8.25 Kcal/mole, respectively. From these results, the heat of adsorption were estimated to be 16.77 and 12.18Kcal/mole, respectively. From the activation energy values, it was known that mechanism of corrosion had been changed by the addition of corrosion inhibitors.