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미세 골절 진달을 위한 초음파 C-scan의 활용 가능성
박원근,최민주,이원흠,이윤준,이헌주,강창익,박전홍 제주대학교 공과대학 첨단기술연구소 2001 尖端技術硏究所論文集 Vol.12 No.2
The study examines the medical potential of an ultrasonic C-scanning technique and for diagnosis of the fatigue induced micro-fractures of the bone. In general, it is not easy to detect the microfracture by a simple radiological technique. In the study, the microfractures were made on the tibia taken from pigs using a three point bending. Comparison was made between the ultrasonic C-scan images (25 MHz) and X-ray images of the bones with the micro-fractures, It was found that the micro-fractures invisible on the X-ray images were observed on the ultrasonic images. It is proposed further in-vitro and in-vivo studies making the ultrasonic C-scan technique clinically useful for the diagnosis of the fatigued induced micro-fractures of the bone which are not possible to detect by the conventional radiological method.
김병호 ( Byung Ho Kim ),감신 ( Sin Kam ),배상근 ( Sang Geun Bae ),김건엽 ( Keon-yeop Kim ),이원기 ( Won Kee Lee ),홍남수 ( Nam-soo Hong ),박형근 ( Hyeung-keun Park ),이혜진 ( Heyjean Lee ),조은정 ( Eun-jung Cho ),채성철 ( Shung C 한국보건정보통계학회(구 한국보건통계학회) 2017 보건정보통계학회지 Vol.42 No.1
Objectives: This study was conducted to investigate economic feasibility of operating Regional Cardiocerebrovascular Centers using cost-benefit analysis. Methods: The current study assessed cost and benefit data collected from nine hospitals which were designated as Regional Cardiocerebrovascular Centers between 2008 and 2010. Results: The operation of Regional Cardiocerebrovascular Centers reduced mortality rate and length of stay due to acute myocardial infarction and stroke and also decreased disability occurred after stroke. The total calculated cost of operating nine Regional Cardiocerebrovascular Centers was 19.85-22.30 billion won and the minimum benefit calculated was 23.98 billion won. Applying the maximum cost and the minimum benefit, the net benefit was 1.68 billion won, which is estimated to 190 million won per Regional Cardiocerebrovascular Center. Conclusions: The present study revealed that the operation of Regional Cardiocerebrovascular Centers was economically beneficial. The benefit would be larger if intangible benefit such as the long-term effects to community hospitals and enhancement of quality of life of patients and their families are considered.
李源根 慶熙大學校 1984 論文集 Vol.13 No.-
The purpose of this study is to measure and determine accurately the critical mass which is the most important unclear characteristics in operation of AGN-201 reactor and the minimum amount of unclear fuel, U-235, to sustain chain reaction. The reactor temperature to affect critical mass was 18.4℃ during performing this experiment. As the result of critical experiment, the critical mass is 687.5 grams under the temperature condition mentioned the above.
이원근,이창민 경희대학교 산학협력기술연구원 1999 산학협력기술연구논문집 Vol.5 No.-
Concentration limit of radioactive accumulation is not established so, effective public information to the people is limit. furthermore, several data which is not suitable for korean is used. Therefore, in this paper, concentration limit is determined using Korean food intake. Even if there were already-established research data, the current research was helpful to researchers in laboratories by giving them the sense of the current status in determining permissible concentration and understanding the plant habitat characteristics about the power plant. Ministary of science of technology will adopt the new recommendation soon, so at this paper, dose limit of new value is used. Experts in this area worry about over-expure by estimation of simple intake limit, therefore, complex intake limit is determined about all kinds of fishery products to solve the problem.
이원근,김정훈 경희대학교 산학협력기술연구원 2002 산학협력기술연구논문집 Vol.8 No.-
The purpose of this study was examine the relationship of meterological factors, including temperature, pressure and pressure difference, to indoor radon concentration in a bid to set up an equation to predict indoor radon concentration. When their relationship was analyzed, it's found that temperature exerted the greatest influence on the change in radon concentration. There appeared positive correlation between the two. But the radon concentration was negatively correlated to indoor pressure or pressure difference. An equation for radon concentration prediction was established in consideration of these results. It' attempted to substitute temperature, pressure and pressure difference for the equation to find out how much radon existed, and then no significant discrepancy was detected between the predicted concentration and actually gauged one. This finding suggested that in case indoor temperature rises, radon concentration could be reduced in the same space by lowering it through ventilation. In addition, information on temperature, pressure and pressure difference would be enough to predict average radon concentration left in a specific space, without actually measuring it.
이원근,김광표 경희대학교 산학협력기술연구원 1995 산학협력기술연구논문집 Vol.1 No.-
In 1995, The American National Standard Institute(ANSI) is planning to release a standard for the performance testing of personnel extremity dosimeters as ANSI N13.32 standard. The standard is applicable to a personnel extremity dosimeter process used for determing the dose equivalent to the extremities at the reference depth of 7㎎/㎠, as recommended by the International Commission for Radiation Units and Measurements Reports 39. In this study, theoretical calculations of dose equivalent were performed by using a Monte Carlo N-particle transport code for the two types of extremity phantom: one to represent a lower arm or leg composed of tissue and bone to test wrist or ankle dosimeters, and the other to represent a finger to test ring of hand dosimeters. The dose equivalent of the two extremity phantoms by taking consideration of the distribution of absorbed dose due to the interaction of homogeneous parallel broad beam of monoenergetic primary photons in the range between 15 keV and 1.5 MeV result from the kerma approximation with the Monte Carlo method.
李原根 慶熙大學校 1992 論文集 Vol.21 No.-
An experimental investigation of the neutron temperature which is important to both reactor design and studying on neutron thermalizing behavior has been performed using AGN-201 reactor. Among two methods, danger coefficient technique and neutron transmission technique, later method is adapted in the present study. Gold and Indium are used as transmission materials. The results showed that the neutron temperature is 486 ˚K using Gold foil, and 434˚K with Indium foil.
李源根 慶熙大學校 1982 論文集 Vol.11 No.-
The reactor noise analysis methods have been widely employed for determining reactor parameters such as time constant and dynamic characteristics, assessing corrected operating characteristics, and diagnosing unexpected abnormal status in advance. Even though the reactor noise analysis methods are developing toward applying to the power reactor the basic theory for stochastic process of nuclear fission can only be verified though experimenting in a critical assembly. The present study is, thus, to develop the fundamental theories and verify through reactor experiments using AGN-201 critical assembly which starts to operate on campus recently. This paper deals with the basic approach to the reactor noise analysis, and is proceeded the detailed experimental results which will be reported in the succeeding reports.
除草劑의 種類와 施用量 및 플라스틱 필름 멀칭이 雜草發生과 고추의 收量 및 生育에 미치는 效果
李政明,曺哉銑,崔根元 경희대학교 부설 식량자원개발연구소 1983 硏究論文集 Vol.4 No.-
Studies were conducted to investigate the effect of Lasso [Alachlor: 2-Chloro-2’6’-dimethyl-N-(methoxymethyl) acetanilied] on mulched and nonmulched hot pepper field. Lasso treatment greatly inhibited weed growth and the granular formulation was more effective than emusifiable concentrate in controlling weed growth in both mulched and nonmulched plots. Lasso effect was not apparent about 50 days after treatment. The growth of pepper plant was greatly promoted by mulching and yield of green peppers was more than doubled by transparent polyethylene film mulching There was no plant in the entire plot which showed apparent phytotoxicity by Lasso treatment.