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송재관,김예현,Song, Jae-Kwan,Kim, Ye-Hyun 대한방사선과학회 1995 방사선기술과학 Vol.18 No.2
Embryos and fetuses are more sensitive to various environmental agents than adults of children biological effects following the exposure, such as intrauterin, malformation, have intimate conception with the prenatal exposure. There have been many studies on radiation and other agent. However, imformation about the ultrasound effects is limited. It is very important to study the effect of ultrasound with these kinds of fatera in consideration of ultrasound protection and safty. In this study, embryonic and fefal effects of ICR mouse embryos irradiated on 24, 48, 12 and 192 hpc of preimplantation and organogenesis period at the intensity of $0.5{\sim}3\;W/cm^2$ were investigated. Many type of external malformation observed in mouse irradiated on 72 hpc and 192 hpc. However, the embryos irradiated on 24 hpc and 48 hpc, at witch embryos had less then 6 cells and were pre-compaction stage, had no sensitivity for external malformation. The threshold doses of external malformation in mouse irradiated on 72 hpc and 192 hpc, at which embryos were consisted of $16{\sim}32$ cells and neural formation stage, were $1\;W/cm^2$ and $0.5\;W/cm^2$.
宋在寬 대구보건대학 1978 대구보건대학 論文集 Vol.4 No.-
X-rays contribute to electron emission om material surfaces primarily through iotoelectric interaction. A simple model ; described for predicting the yield and nergy spectrum of photon and Auger elctrons emitted from materials exposed o X-ray with low energy. In this paper, we have calculated the yield of primary, Auger, and secondary ectrons. The results of the photoelecic yield mode developed here suggests 1) The angular distribution of emitted electrons (Perunit angle) is proportional to sinθ cosθ for all electron energies and all componants (Primary, Auger, or secondary) II) The shape of the energy specturm of the photoelectric yield is independent of angle. III) For thin targets the forward and backward photoelectric yields are identical
宋在寬 대구보건대학 1986 대구보건대학 論文集 Vol.9 No.-
Since the application of double Contrast method into the routine X-ray examination of the stomach, diagnosis of advanced Cancer of the stomach has become much easier. Particularly, very fine morphological changes of advanced Cancer can be well demonstrated by this method. Therefore, diagnosis of the proximal limit of infiltration in stomach Cancer can be made very effectively, which is mostly helpful for surgeon preoperatively. With combined contrast and double contrast studies as its chief technique, to which compression technique is added, this system permits us to take so-called fine relief and read it, and discover far more minute changes than those caught by conventional method. According to this newly established and systematized theory of diagnostics, compression technique is most useful in diagnosis of protruded or elevated lesion while double contrast studies are most effective in that of excavated or depressed lesion, Ceaseless efforts in recent years, furthermore, have gradually raised the ceiling in diagnosis and it is now possible to discover early-stage cancers of the stomach as small as less than l0m across and less than lm thick. It may be said that we have now reached the limit of diagnosis using bare eyes. There are two main uses for X-ray diagnosis of the stomach. First, it is used for determination of the presence or absence of abnormal changes over the whole field of the stomach to disclose any lesion present in the area, the process being usually called survey or scout diagnosis. Secondly, it is used for through identification of the abnormalities discovered or suspected, the process being called qua1itative diagnosis. We would like to emphasize that such a step-by-step accumulation of everyday experiences leads directly to correct and confident diagnosis.
宋在寬 대구보건대학 1987 대구보건대학 論文集 Vol.10 No.-
It is known beyond a shadow of a doubt that ⅹ-rays are harmful. If sufficiently intense they can cause cancer, leukemia, and genetic damage. What is not known for certain is the degree of effect following diagnostic levels of ⅹ-radiation. We do know that the benefits derived from the diagnostic application of ⅹ-rays in medicine are enormous. It is the job of the technologist, along with the radiologist, physicist, and maintenance engineer, to produce high-quality ⅹ-ray studies with a minimum of radiation exposure. This approach can result in the highest benefit and the smallest risk. The effects of ⅹ-rays on humans are the result of interactions at atomic levels. These atomic interactions take the form of ionization or excitation of orbital electrons and result in the deposition of energy in tissue. The deposited energy can result in a molecular change, the consequences of which can be disastrous if the molecule involved is critical. Fig.⑴ summarizes the steps between radiation exposure and latent wholebody injury When an atom is ionized, its chemical binding properties change. If the atom is a constituent of a large molecule, the ionization may result in breakage of the molecule or relocation of the atom within the molecule. The abnormal molecule may in time function improperly or cease to function, which can result in serious impairment or death of the cell. This process is not irreversible. At each stage in the sequence it is possible to recover from radiation damage. Ionized atoms can become neutral again by attracting a free electron. Molecules can be mended by repair enzymes. Cells and tissues can regenerate and recover from the radiation injury. If the radiation injury occurs within minutes or days after radiation exposure, it is classified as an immediate or early of radiation. On the other hand, if the human injury is not observable for many months or years, it is termed a delayed or late effect of radiation. The following outline summarizes the possible early and late human responses to radiation exposure. In addition many other radiation responses have been experimentally observed in animals. Most of the human responses have been observed following rather large radiation doses. But we are cautious and assume that even small doses are harmful.
송재관,우근신,박찬곤 청주대학교 산업과학연구소 1999 産業科學硏究 Vol.17 No.1
Morphological analysis is the first work in a natural language processing. Classification of part-of-speech in morphological analysis is surely necessary. There are many researches about it. But, because standard of the classification of part-of-speech is various, it doesn't have consistency. So, syntactic structure of the Korean language is expressed complicatedly, and it declines the efficiency about a machine translation. This study extracts a morphological feature to appear in a part-of-speech tagging with unique standard. it suggests an algorithm of automatic part-of-speech tagging. This algorithm can extract a syntactic structure of the Korean language and minimize the difference of syntactic structure with object language to machine translation. The syntactic structure extracted can form a sentence pattern of object language to machine translation.