• Journal of The Korean Radiological Technologist Association
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• v.28 no.1
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• pp.112-119
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• 2002

Purpose : The purpose of this study is to evaluate the usefulness, after we compare and analyze the difference about the location of a lesion and the result of diagnosis on chest radiographs(CR) and low dose computed tomography(LDCT) in subjects for healt

• Agrochemical news magazine
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• v.17 no.5 s.134
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• pp.58-63
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• 1996

''소비자는 통상 매스컴에서 많이 다루고 있는 식품중 잔류농약, 항생물질이나 방사선 조사식품에서 대한 우려를 많이 하고 있다. 그러나 식품과학적 측면에서 이와같은 오염물질에 의한 위해발생 가능성은 별로 높지않다. 오히려 우리가 별 문제가 없다고 생가가하고 있는 식품중 미생물의 증식이나 영양적 불균형이 더 큰 위해발생 요인이다.'' ''발생가능한 모든 위해를 완전히 차단하는 것은 현실적으로 불가능할 분만 아니라 국민건강상 더 큰 위해를 초래할 수 있다. 그러나 대부분의 국민들은 단순히 적은 가능성일 뿐인 위해발생에 더 관심이 많고, 그 실익에 대해서는 모르거나 현실상황을 외면하는 경우가 많아 식품위생행정에 대한 불신이 증폭되고 있다. '' 최근 산국식품연구원의 송인상 박사는 한국농촌의학회지를 통해 발표한 $\ulcorner$식품의 안전성 확보를 위한 과제들$\lrcorner$이란 주제에서 이같이 지적하고 식품위생에 대한 보다 정확하고 과학적인 지식을 소비자에게 제공하는 교육과 홍보의 기능이 매우 중요하다고 주장했다. 주요내용을 발췌 소개한다.

• Agrochemical news magazine
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• v.17 no.5 s.134
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• pp.68-75
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• 1996

''소비자는 통상 매스컴에서 많이 다루고 있는 식품중 잔류농약, 항생물질이나 방사선 조사식품에서 대한 우려를 많이 하고 있다. 그러나 식품과학적 측면에서 이와같은 오염물질에 의한 위해발생 가능성은 별로 높지않다. 오히려 우리가 별 문제가 없다고 생가가하고 있는 식품중 미생물의 증식이나 영양적 불균형이 더 큰 위해발생 요인이다.'' ''발생가능한 모든 위해를 완전히 차단하는 것은 현실적으로 불가능할 분만 아니라 국민건강상 더 큰 위해를 초래할 수 있다. 그러나 대부분의 국민들은 단순히 적은 가능성일 뿐인 위해발생에 더 관심이 많고, 그 실익에 대해서는 모르거나 현실상황을 외면하는 경우가 많아 식품위생행정에 대한 불신이 증폭되고 있다. '' 최근 산국식품연구원의 송인상 박사는 한국농촌의학회지를 통해 발표한 $\ulcorner$식품의 안전성 확보를 위한 과제들$\lrcorner$이란 주제에서 이같이 지적하고 식품위생에 대한 보다 정확하고 과학적인 지식을 소비자에게 제공하는 교육과 홍보의 기능이 매우 중요하다고 주장했다. 주요내용을 발췌 소개한다.

• Agrochemical news magazine
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• v.17 no.5 s.134
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• pp.76-76
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• 1996

''소비자는 통상 매스컴에서 많이 다루고 있는 식품중 잔류농약, 항생물질이나 방사선 조사식품에서 대한 우려를 많이 하고 있다. 그러나 식품과학적 측면에서 이와같은 오염물질에 의한 위해발생 가능성은 별로 높지않다. 오히려 우리가 별 문제가 없다고 생가가하고 있는 식품중 미생물의 증식이나 영양적 불균형이 더 큰 위해발생 요인이다.'' ''발생가능한 모든 위해를 완전히 차단하는 것은 현실적으로 불가능할 분만 아니라 국민건강상 더 큰 위해를 초래할 수 있다. 그러나 대부분의 국민들은 단순히 적은 가능성일 뿐인 위해발생에 더 관심이 많고, 그 실익에 대해서는 모르거나 현실상황을 외면하는 경우가 많아 식품위생행정에 대한 불신이 증폭되고 있다. '' 최근 산국식품연구원의 송인상 박사는 한국농촌의학회지를 통해 발표한 $\ulcorner$식품의 안전성 확보를 위한 과제들$\lrcorner$이란 주제에서 이같이 지적하고 식품위생에 대한 보다 정확하고 과학적인 지식을 소비자에게 제공하는 교육과 홍보의 기능이 매우 중요하다고 주장했다. 주요내용을 발췌 소개한다.

• Journal of Korean Medicine Rehabilitation
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• v.20 no.2
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• pp.199-208
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• 2010

Objectives : To study the cervical lordosis and roentgenographic analysis of cervical disc space in neck pain with or without temporomandibular disorder(TMD). Methods : Radiographic measures of cervical lordosis, cervical disc space narrowing were collected, statiscally analyzed. Results : TMD group showed a significant increase in cervical lordotic angle as compared with non-TMD group, whereas no significant change in cervical disc degeneration. Conclusions : The findings from this study suggest that the curvature of the cervical spine is related to the subject's TMD.

• The korean journal of orthodontics
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• v.38 no.3
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• pp.202-213
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• 2008

Objective: The purpose of this study was to compare the cephalometric measurements of obese and non-obese Korean male patients with obstructive sleep apnea syndrome (OSA). Methods: Eighty-seven adults who had visited the Sleep Disorder Clinic Center in Keimyung University, Daegu, Korea were examined and evaluated with polysomnography (PSG) and lateral cephalogram. They were divided into 4 groups (non-obese simple snorers, obese simple snorers, non-obese OSA patients, obese OSA patients) according to AHI (Apnea-Hypopnea Index) and BMI (Body Mass Index). Results: The obese OSA group had the highest AHI among the 4 groups. The non-obese OSA group had a significantly steeper mandibular angle and shorter tongue length than the obese OSA group. The hyoid bone of the obese OSA group was positioned anterior and inferior as compared with the non-obese OSA group. Multiple regression analysis showed that tongue length in the obese OSA group and retroposition of hyoid bone in the non-obese OSA group were significant determinants for the severity of AHI. Conclusions: From a cephalometric point of view, the obese and non-obese pateints with OSA may be characterized by different pathogeneses. Therefore, they have to be managed by individualized treatment. For the obese OSA patients, weight control must be advised as a first choice and for the non-obese OSA patients, oral appliance, nasal CPAP, UPPP and others could be chosen according to the obstructive sites.

• The Journal of Korean Society for Radiation Therapy
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• v.26 no.1
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• pp.11-19
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• 2014

Purpose : To derive the most appropriate factors by considering the effects of the major factors when applied to the optimization algorithm, thereby aiding the effective designing of a ideal treatment plan. Materials and Methods : The eclipse treatment planning system(Eclipse 10.0, Varian, USA) was used in this study. The PBC (Pencil Beam Convolution) algorithm was used for dose calculation, and the DVO (Dose Volume Optimizer 10.0.28) Optimization algorithm was used for intensity modulated radiation therapy. The experimental group consists of patients receiving intensity modulated radiation therapy for the head and neck cancer and dose prescription to two planned target volume was 2.2 Gy and 2.0 Gy simultaneously. Treatment plan was done with inverse dose calculation methods utilizing 6 MV beam and 7 fields. The optimal algorithm parameter of the established plan was selected based on volume dose-priority(Constrain), dose fluence smooth value and the impact of the treatment plan was analyzed according to the variation of each factors. Volume dose-priority determines the reference conditions and the optimization process was carried out under the condition using same ratio, but different absolute values. We evaluated the surrounding normal organs of treatment volume according to the changing conditions of the absolute values of the volume dose-priority. Dose fluence smooth value was applied by simply changing the reference conditions (absolute value) and by changing the related volume dose-priority. The treatment plan was evaluated using Conformal Index, Paddick's Conformal Index, Homogeneity Index and the average dose of each organs. Results : When the volume dose-priority values were directly proportioned by changing the absolute values, the CI values were found to be different. However PCI was $1.299{\pm}0.006$ and HI was $1.095{\pm}0.004$ while D5%/D95% was $1.090{\pm}1.011$. The impact on the prescribed dose were similar. The average dose of parotid gland decreased to 67.4, 50.3, 51.2, 47.1 Gy when the absolute values of the volume dose-priority increased by 40,60,70,90. When the dose smooth strength from each treatment plan was increased, PCI value increased to $1.338{\pm}0.006$. Conclusion : The optimization algorithm was more influenced by the ratio of each condition than the absolute value of volume dose-priority. If the same ratio was maintained, similar treatment plan was established even if the absolute values were different. Volume dose-priority of the treatment volume should be more than 50% of the normal organ volume dose-priority in order to achieve a successful treatment plan. Dose fluence smooth value should increase or decrease proportional to the volume dose-priority. Volume dose-priority is not enough to satisfy the conditions when the absolute value are applied solely.

• Radiation Oncology Journal
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• v.12 no.1
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• pp.1-8
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• 1994

When cells are exposed to low doses of a mutagenic or clastogenic agents. they often become less sensitive to the effects of a higher dose administered subsequently. Such adaptive responses were first described in Escherichia coli and mammalian cells to low doses of an alkylating agent. Since most of the studies have been carried out with human lymphocytes, it is urgently necessary to study this effect in different cellular systems. Its relation with inherent cellular radiosensitivity and underlying mechanism also remain to be answered. In this study, adaptive response by 1 cGy of gamma rays was investigated in three human lymphoblastoid cell lines which were derived from ataxia telangiectasia homozygote, ataxia telangiectasia heterozygote, and normal individual. Experiments were carried out by delivering 1 cGy followed by 50 cGy of gamma radiation and chromatid breaks were scored as an endpoint. The results indicate that prior exposure to 1 cGy of gamma rays reduces the number of chromatid breaks induced by subsequent higher dose (50 cGy), The expression of this adaptive response was similar among three cell lines despite of their different radiosensitivity. When 3-aminobenzamide, an inhibitor of poly (ADP-ribose) polymerase, was added after 50 cGy, adaptive responses were abolished in all the tested cell lines. Therefore it is suggested that the adaptive response can be observed in human lymphoblastoid cell lines, which was first documented through this study. The expression of adaptive response was similar among the cell lines regardless of their radiosensitivity. The elimination of the adaptive response by 3-aminobenzamide is consistent with the proposal that this adaptive response is the result of the induction of a certain chromosomal repair mechanism.

• Radiation Oncology Journal
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• v.10 no.1
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• pp.43-48
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• 1992

Between December 1983 and December 1989, twenty-five breast carcinoma patients were treated with surgical resection and postoperative radiotherapy at Inje University Seoul Paik Hospital. Twenty-three of 25 were evaluable and there were 7 patients with stage II ,14 patients with stage III, and 2 patients with stage IV. Twenty-one patients were treated with modified radical mastectomy and the remained 2 patients with simple mastectomy. The follow-up period ranged from 2 to 8 years. The local control rate was $83\%$ for the entire group. The local control rates for each stage were $100\%$(6/6) for stage II, $73\%$(11/15) for stage III, and $100\%$(2/2) for stage IV. The number of metastatic axillary nodes was a good predictor of locoregional cotrol. It was $100\%$ for the patients with 0-3 metastatic nodes and $72\%$ for more than 4 nodes, respectively. The 5-year overall survival rate for the entire group was $59\%$, and the disease-free survival rate was $32\%$, The 5-year survival rates for each stage II, III and IV was $83\%$, $59\%$ and $50\%$, respectively. The distant metastasis occured in 10 out of 23 patients and the most common site was bone. The results indicate that postoperative radiotherapy continues to play an important role in the primary.

• Journal of radiological science and technology
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• v.32 no.1
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• pp.53-60
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• 2009

This study examined the change in the attenuation of X-rays with the ROI (Region of Interest) in DR (Digital Radiography) according to the stomach contents by manufacturing a tissue equivalent material phantom to simulate real stomach tissue based on the assumption that there is some attenuation of X-rays and a difference in imaging quality according to the stomach contents. The transit dosage by the attenuation of X-rays decreased with increasing protein thickness, which altered the average ROI values in the film and DR images. A comparison of the change in average ROI values of the film and DR image showed that the image in film caused larger density changes with varying thickness of protein than the image by DR. The results indicate that NPO (nothing by mouth) is more important in film system than in DR system.