본 논문은 2016년 하계 학술대회 발표자료로 방사선 이용 전문가와 감독자를 양성하기위한 집체 교육 과정에 필요한 역량을 도출하고자 한다. 방사선 전문가의 수준별 필요 역량을 도출하기 위하여 기존 연구 결과의 시의성과 적합성을 재평가한다. 평가 결과, 방사선 전문가의 수준별 집체교육을 통해 전문가 양성을 위한 역량을 제안한다.

The reduction in solar radiation transmittance(SRT) because of dust and other foreign materials was experimentally tested in two types of greenhouses with the intent to obtain basic data for establishing maintenance and management guidelines for greenhouse cover materials. The test results in the greenhouse in Gyehwa-do estimated the amount of removed dust at 16.8– 1,021.6 mg·m-2(average: 520.7 mg·m-2), and the dust amount varied widely with the measurement points. The SRT measured in triplicate before and after dust removal ranged 68.5–80.9% and 80.9–87.2%, respectively; thus, there was an improvement in SRT by about 8.1% after dusting. In contrast, the greenhouse in Gyeongsang National University did not exhibit great fluctuations in the coefficient of determination(correlation coefficient) regardless of the daily total, average, or maximum horizontal surface radiation; the SRT gradually decreased over time. The SRT increased or decreased, showing clearly different patterns in summer and winter half years, as did the coefficients of determination(0.468–0.828). Dust was measured to be in the range 747.1– 983.1 mg·m-2(average: 840.1 mg·m-2), without great differences between the measurement points, unlike in the case of the greenhouse in Gyehwa-do. The SRT measured before and after the dust removal ranged 73.0–80.5% and 81.0–88.6%, respectively, showing an average improvement of about 7.9%. The SRT measured after washing with water ranged 88.7–90.6%, demonstrating a greater improvement with an average increase rate of 13.0%, which is 5.1% higher than the increase rate after dust removal. These results suggest that although washing with water rather than dust removal improves SRT to a greater extent(13.0% vs. 7.9%), dust removal alone is considered to provide considerable improvement in SRT. Comparison of the images of the unused film and pre-dusting film under the microscope revealed that foreign materials such as dust were adhered to the pre-dusting film, and variations were observed according to the magnification ratio and photographed area.

This study implemented the survey and analysis of the exposure to radiation by using the questionnaire targeting H Health College, located in Daejeon from September 1st, 2014 to October 15th. A total of 400 copies of the questionnaire was distributed and among them, 385 copies, excluding 15 omitted ones (total collection ratio: 96.3%), were used for the analysis. The analysis results are as follows. For the harmfulness of radiation for diagnosis, the average of the health-related was 3.15 and the average of the health-unrelated was 2.82, which the health-related students recognized the harmfulness of radiation for diagnosis higher (p<.001). The necessity of radiation for diagnosis was appeared higher from the health-related students as the average of the health-related was 3.07 and 2.52 for the average of the health-unrelated (p<.001). The recognition on the prevention of the exposure to radiation was higher from the health-related students as the average of the health-related was 3.13 and 1.84 for the average of the health-unrelated (p<.001). From this study, the necessity of using radiation from the medical field and the recognition on its harmfulness appeared to have a big difference between the health-related and health-unrelated. For such, the accurate understanding of the recognition on radiation and the education to improve recognition on radiation are considered to be required.

Beam hardening artifact can be caused by metal material when performing PET exam. Therefore, we studied a solution decreasing artifact caused by metallic dental implant. The higher voltage, the lesser artifact in CT exam. But Higher voltage dosen't affect PET exam. The thicker silicon the lesser artifact in CT and PET exam. Both methods make less artifact in CT and PET exam. But considering safety of patient, the way of using silicon is better.

비순환식 고형배지경에서 배액이 토양과 지하수 오염을 발생시키는 문제를 해결하고자 그동안 연구된 데이터를 바탕으로 배액 최소화 재배방식을 확립을 위해 본 연구는 토마토 코이어 수경재배농가 시설에서 FDR 센서, 적산일사량 센서 및 타이머를 이용하여 토마토를 재배하며 급배액량, 생육 및 생산량을 비교하였다. 정식 후 88일까지 일일 식물체당 평균 급액량은 처리구에 따른 큰 차이가 없었다. 하지만 정식 후 88일 이후 107일 까지 TIMER, FDR, IR 제어구 각각의 일일 식물체당 평균 급액량은 IR(2125mL) > TIMER(2063mL) > FDR(1983mL) 수준이었고 108일부터 120일 까지는 IR(2000mL) > TIMER(1664mL) > FDR(1500mL) 수준 이었다. 배액률은 TIMER 제어구의 경우 5~12%, FDR 센서 제어구의 경우 0~7%, IR 제어구의 경우 12~19% 수준으로 IR > TIMER > FDR 순이었다. 정식 후 88일 이후부터는 FDR과 IR 제어구가 급액량에 상이한 결과를 보였는데, 이는 재배 후기 즉, 5월 20일 이후 (정식 후 94일) 누적일사량의 증가로, IR 제어구에서는 급액이 증가된 반면 FDR 센서 처리구는 적심 이후 30일이 경과된 6월 2일경부터 IR 제어구 보다 일일 급액량이 평균 500mL 적게 공급된 결과이다. 식물체 생육 및 상품과 수량도 급액방식에 따른 통계적 유의차는 없었지만, 당도는 FDR 처리구에서 TIMER 처리구에 비해 약 11%, IR 처리구에 비해 약 18% 높았다.

Solar power is being spotlighted recently as a new energy source due to environmental problems and applications of solar power to curved structures are increasing. Solar panels installed on curved surfaces have different efficiencies depending on its position and the efficient positioning of solar panels plays a critical role in the design of solar power generation systems. In this study, the changing characteristics of solar irradiance were analyzed for hemispherical dome with a large curvature and the positioning of solar panels that can efficiently utilize solar energy was investigated. With an icosahedron-based hemispherical dome consisting of triangular elements as target model, a program for calculating solar irradiance using a normal vector of the solar module on each face was developed. Furthermore, the change of solar irradiance according to the sun’s path was analyzed by time and season, and its effects on shades were also examined. From the analysis results, the effective positioning could be determined on the basis of the efficiency of the solar panels installed on the dome surfaces on solar irradiance.

본 연구는 일조시간과 강수량 자료를 이용하여 다중회귀 방법을 통해 일사량을 추정하였다. 연구에 사용된 자료 들은 강릉지역에 위치한 강원지방기상청(105 관측소, 1980-2007)과 신강원지방기상청(104 관측소, 2009-2014) 그리고 강릉원주대학교(GWNU 관측소, 2013-2014)이며, 105 관측소 자료를 통해 산출된 회귀식을 104 관측소와 GWNU 관측 소에 적용하여 비교분석하였다. 먼저, 일조시간만을 이용하였을 때 104 관측소는 기존 연구들과 유사한 상관계수(0.96) 와 표준오차(1.16 MJ m−2 )가 나타났고, GWNU 관측소에서는 높은 상관계수(0.99)와 낮은 표준오차(0.57 MJ m−2 )로 분석 되었다. 그리고 일조시간과 강수량 자료를 104 관측소에 적용하였을 때 상관계수 0.96과 표준오차 0.99 MJ m−2로 일조 시간만을 적용했을 때보다 표준오차가 감소되었다. 일조시간만을 이용한 방법보다 강수량이 추가된 방법은 관측 일사량 과 편차의 극값이 −26.6%(2010년 3월)에서 −31.0%(2011년 2월)로 증가되었다. 이는 강수량이 5월과 7-9월에 집중되어 나타나 이외의 월에서 추정식의 계수가 음으로 계산되었기 때문으로 분석된다. 따라서 한반도와 같이 강수량이 여름철 에 집중되는 지역에서는 월평균 강수량을 일사량 추정에 이용할 때 주의를 기울여야 할 것이다.

Sasa quelpaertensis Nakai is a type of edible bamboo grass distributed on Jeju Island, Korea. S. quelpaertensis has been used as afolk medicine for treatment of a variety of ailments. It has been reported to present biological effects, including anti-inflammatory and antioxidant effects. In this study, we demonstrate that S. quelpaertensis Nakai extract (SNE) rescues immunocytes from gamma radiation-induced apoptosis and oxidative DNA damage. We examined the cytotoxicity, cell proliferation, DNA damage, apoptosis, and generation of reactive oxygen species (ROS) in mice given SNE for 45 days in immune cells. To determine the splenocytes protection capability of SNE, gamma-ray was irradiated to the whole body of C57BL/6 mice. Our results suggest that SNE stimulated the proliferation of splenocytes without cytotoxic effects. In addition, SNE not only decreased DNA damage but also reduced apoptosis of splenocytes, and attenuated the production of ROS generation in hydrogen peroxide-induced splenocytes. Therefore, SNE can protect against gamma radiation-induced damage in mice.

The purpose of this study was to investigate radiation dose sensitivity due to displacement of human extremities in the water bolus box on radiation therapy. Water bolus box and human thigh with femur bone were constructed in computerized radiation therapy planning system to verify the absorbed dose. Two 6MV X-ray beams were irradiated bilaterally into water bolus box and then radiation dose were calculated each situation at displacement of middle axis of thigh from the center in water bolus box to right and left direction. Absorbed dose of thigh and femur bone increased by the distance of displacement. The maximum dose of thigh even increased 20% over than prescribed dose. This is in contrast to conventional concept of dose distribution in water bolus box. Based on this result, displacement of body site in the water bolus box have to be averted during radiation therapy.

This study analyzed the total number of 19,636 patients and radiation technologists, 11,433 of male and 8,203 of female by examined body parts, age, types of detectors, the using contrast enhancement and working condition of the technologists, regular staffs or rotation-duty staffs, based on the K-DOS program distributed by FDA with the DLP value of diagnostic evaluation. The result shows that the effective radiation dose was 0.7mSv~41.7mSv for each region and male patients had more radiation exposure than females. And the amount of exposure was also affected by the types and the method of detectors. Furthermore, the regular staffs took the role of helping the patient to get reduced amount of radiation exposure than rotation duty-staffs. Computed tomography (CT) use has increased dramatically over the past several decades. In this reason, to support the patients and the workers’ health in the field, the hospitals should apply specialized regular working radiation technologist system and manufacturing companies of those CTs should develop low medical radiation exposure devices.

Sulfonated poly(arylene ether sulfone)(SPAES) random copolymers are representative alternatives to perfluorinated sulfonic acid(PFSA) ionomers used as the state-of-the-art polymer electrolyte membranes for fuel cells. SPAES copolymers have advantages such as low hydrogen permeability, low production cost. However, it is difficult to demonstrate high electrochemical single cell performances for a long period time, since SPAES membranes have critical interfacial issues with catalyst layers containing PFSA ionomers, particularly in the repeated hydrated and dehydrated cycles. In this study, called as radiation grafting of proton conductive polymers on SPAES membranes, is tried in order to improve proton conductivity without a severe loss in dimensional stability and to reduce interfacial resistance with PFSA catalyst layers at the same time.

In this paper we have examined the linear stability of triangular equilibrium points in the photogravitational restricted three body problem when both primaries are triaxial rigid bodies, the bigger one an oblate spheroid and source of radiation. The orbits about the Lagrangian equilibrium points are important for scientific investigation. A number of space missions have been completed and some are being proposed by various space agencies. We analyze the periodic motion in the neighbourhood of the Lagrangian equilibrium points as a function of the value of the mass parameter. Periodic orbits of an infinitesimal mass in the vicinity of the equilibrium points are studied analytically and numerically. The linear stability of triangular equilibrium points in the photogravitational restricted three body problem with Poynting- Robertson drag when both primaries are oblate spheroids has been examined by A. Kumar (2007). We have found the equations of motion and triangular equilibrium points for our problem. With the help of the characteristic equation we have discussed stability conditions. Finally, triangular equilibrium points are stable in the linear sense. It is further seen that the triangular points have long or short periodic elliptical orbits in the same range of μ.

This study deals with the generalization of the Elliptic Restricted Three-Body Problem (ER3BP) by considering the effects of radiation and oblate spheroid primaries. This may illustrate a gas giant exoplanet orbiting its host star with eccentric orbit. In the three dimensional case, this generalization may possess two additional equilibrium points (L6,7, out-of-plane). We determine the existence of L6,7 in ER3BP under the effects of radiation (bigger primary) and oblateness (small primary). We analytically derive the locations of L6;7 and assume initial approximations of (μ-1, ±3A2), where  and A2 are the mass parameter and oblateness factor, respectively. The fixed locations are then determined. Our results show that the locations of L6,7 are periodic and affected by A2 and the radiation factor (q1).

This work considers the elliptic restricted three-body problem under effects of radiation of the bigger primary, and an oblate spheroid for the smaller primary to mimic an exoplanetary system with a gas giant planet. Under the in uences of both effects we look for the existence of the triangular equilibrium points and the in uences of the radiation and oblateness on the locations and motion of the points. We set the system in a normalized rotating coordinate system and derive equations of motion for the third infinitesimal object. Our study shows that the effects modify the equilateral/isosceles triangle shape with respect to the primaries. The triangular points also have non-planar motion with period depending on the value of the planet oblateness.

The purpose in this study is to investigate CT number difference between conventional CT and CT simulator. It shows good correlation in CT number on the muscle, bone, and air. However, in the liver, lungs and water, the low correlation was detected. This result can become the good index for the direction of the distribution of dose difference research between CT equipment for using the computerized radiation therapy planning system.

Selenium (Se) is an essential trace element for humans and animals, and several findings suggest that dietary Se intake may be necessary for bone health. Accumulating evidence indicates that Se compounds possess anticancer properties. Se is specifically incorporated into proteins in the form of selenocysteine and non-specifically incorporated as selenomethionine in place of methionine. This study evaluated protection by Se in the bone repair process in ovariectomized rats after irradiation. For such purpose, 80 ovariectomized female Sprague-Dawley rats were randomly divided into 4 experimental groups: ovariectomized (Ov), Ov/Se, Ov/irradiated (Irr) and Ov/ Se/Irr. A bone defect was created on the tibia of all animals 40 days after ovariectomy. Two days after surgery, only the Ov/Se and Ov/Se/Irr rats received 0.8 mg Se/kg. Three days after surgery, only the Ov/Irr and Ov/Se/Irr rats received 10 Gy of X-rays on the lower limb region. The animals were euthanized at 7, 15, 22 and 29 days after surgery to assess the repair process, which was evaluated by analysis of trabecular bone number (Masson Trichrome) and birefringence analysis (Picrosirius). It was possible to observe a delay in the bone repair process in the ovariectomized/irradiated group and similarity between the ovariectomized, Ov/ Se and Ov/Se/Irr groups. Our findings suggest that sodium selenite may influence a radioprotective effect in the bone repair of tibia of ovariectomized rats without toxicity.

This study was conducted to provide fundamental data on the awareness of radiation, specifically the differences between general awareness, psychological state and harmful effects. Data was collected from 334 University students in the Chungbuk region through a self-administered questionnaire. According to the results of the reliability and factor analysis, the awareness of radiation was 2.80, with a Cronbach alpha coefficient of 0.815 and KMO of 0.798. Factor analysis extracted three components of the awareness of radiation, which we named general awareness (factor 1), psychological state (factor 2), and harmful effect (factor 3). There were significant differences in the general awareness of natural radiation and radiation-containing foods (p<0.05), whereas no significant differences were found in the general awareness of radiation food supply (p>0.05). Also, the psychological state showed a significant difference in exposure inspection, future exposure, and radiation-containing food (p<0.05), whereas no significant differences were found in the refusal of radiation inspection (p>0.05). The harmful effects showed a significant difference in the rejection of radiation (p<0.05), but no significant differences in the cancer and genetic effects, diseases and physical harmfulness (p>0.05). A significant positive result (p<0.05) was found for the psychological state according to the harmful effects of radiation. Based on this study, detailed and continuous education must be accomplished by increasing the awareness of radiation and the acceptance level, conveying a proper understanding of radiation and assisting subjects with receiving the information they desire through various educational mediums.