자연환경방사선에 의한 피폭선량(유효선량당량)의 종합적 해석연구

전재식,채하석,이병영,김현창,이동준,김도성,엄두하 충남대학교 기초과학연구소 1990 연구논문집 Vol.10 No.-

자연환경방사선의 세 가지 주요 요소인 지각방사선, 우주선 전리성분 및 라돈과 그 자핵종이 주는 선량을 측정, 해석하였는 바 18개월간에 걸쳐 대전, 수원, 경산 지역에 대하여 수행하고 이를 종합하여 유효선량당량으로 평가하였다. 지각방사선과 우주선 전리성분 측정을 위하여 3"∮×3" Nal(Tl) 섬광검출기와 휴대형 다중파고분석기를 이용한 감마선 분광분석 및 ^7LiF PTEE disk TLD에 의한 적산선량측정을 병행하였고, 공기중 라돈농도의 측정은 CR-39 고체비적검출기를 내장한 라돈컵을 설계제작하여 사용하였으며 비적수 라돈농도 교정인자는 스웨덴 국립방사선 방호연구소의 표준 라돈 챔버내에서 조사하여 결정하였다. 세 지역의 가연방사선에 의한 유효선량당량에는 약간의 수치적 차이는 있었으나 본질적 차이는 찾아볼 수 없었으며 지역 측정치의 분산가중 평균치는 지각방사선 (463±3)uSvㆍy^-1[(52.9±0.3)nSvㆍh^-1], 우주선 전리성분 (287±15)uSvㆍy^-1[(32.8±1.7)nSvㆍy^-1]로 외부 피폭이 (775±9)uSvㆍy^-1[(88.5±1.0)nSvㆍy^-1]였으며 라돈과 그 자핵종에 의한 내부피폭은 (1973±298)uSvㆍy^-1[(225.2±34.0)nSvㆍy^-1]였다. 따라서 자연황경방사선에 의한 여간 총 선량당량은 (2762±296)uSvㆍy^-1[(315.3±34.0)nSvㆍh^-1]로 평가되었는데 이 값들은 UN보고서^(11)에 나온 “정상적 자연방사선 지역”의 값과 비교할 만한 타당한 값으로 나타났다. Assessment of effective dose equivalent from natural environmental radiation that consists of terrestrial gamma­ray, ionizing component of cosmic­ray and alpha­rays of atmospheric radon and its decay products has been carried out for 18 months in Daejeon, Suwon and Kyungsan areas. A 3"∮×3"cylindrical Nal(Ti) scintillation detector in association with portable multichannel analyser and ^7LiF PTFE disk TLDs were used for the measurement of terrestrial gamma­ray and cosmic­ray ionizing component, while self­designed radon­cups with CR-39 SSNTD attached to the inside bottom were used for the integral measurement of at­mospheric radon concentration. Determination of calibration factor for converting track density of CR-39 detector to radon concentration was made by irradiation of radon­cups in the standard radon chamber of Swedish National Institute of Radiation Protection. Although resultant effective dose equivalents of three different measurment points show minor numerical differences, no essential discripancy between the places was found. The variance weighted means of the annual effective dose equivalents of each component of radiation from the tree places came out to be: (463±3)uSvㆍy^-1[(52.9±0.3)nSvㆍy^-1] for terrestrial gamma­ray, (287±15)uSvㆍy^-1[(32.8±1.7)nSvㆍy^-1] for ionizing component of cosmic­ray and (1973±298)uSvㆍy^-1[(225.2±34.0)nSvㆍy^-1] for internal exposure of radon and its decay products. Consequent total effective dose equivalent turned out to be (2762±298)uSvㆍy^-1[(315.3±34.0)nSvㆍy^-1], which if reasonably comparable with that appeared in UNSCEAR Report^[11]as per caput annual effective dose equivalent in “areas of normal back ground radiation.”

魚臭成分과 分析技術

朴斗天,車傭準 國立 昌原大學校 産業技術硏究所 1987 産技硏論文集 Vol.1 No.-

식품은 단백질, 지질 및 당 등의 영양성분이나 물, 색소, 엑기스 및 냄새성분 등의 비영양성분으로 구성되어 있으며 이들 비영양성분은 식품에 있어 불필요한 것이 아니고, 각 식품에 있어서 텍스츄어, 색조, 정미성분 및 향기등에 지배적인 영향을 준다. 특히 風味(맛과 냄새)는 식품의 중요한 요소이며 그 중에서 냄새는 맛에 비하여 식품의 구매욕을 결정적으로 지배한다. 일반적으로 냄새란 香, 臭, 芳, 馨, 馥, 郁, Perfume, Aroma, Flavor, Odor, Smell등의 용어로 표현되며 식품의 경우 후각을 통하여 느끼는 냄새는 Aroma, 입은 통하여 맛과 향을 느끼는 일체의 감각은 Flavor라는 용어를 쓰고 있다.1) 식품의 냄새에 관한 연구는 단백질, 지질 등의 일반성분의 연구에 비하여 훨씬 뒤져 있으며 연구의 역사도 짧다. 특히 魚臭성분에 관한 연구는 1960년대 후반부터 시작하여 그후 여러 가지 추출 및 분리방법의 개선이 진보되었으며 최근에는 분석기기의 발달로 인하여 급속적인 연구가 진행되고 있는 실정이다. 우리 나라에서는 옛부터 수산물을 단백질 공급원으로 이용해 왔으므로 비교적 생선냄새에 잘 익숙하여져 있지만 최근 청소년층과 도시인들은 식생활패턴의 변화로 인하여 생선을 기피하는 경향이 있는데 이는 어패류의 냄새 가운데 불쾌취(비린내)가 주 요인으로 되고 있다. 따라서 본고에서는 어취성분에 대한 연구문헌과 분석기술의 자료를 정리하여 어패류의 가공 및 이용에 있어 어취의 문제를 해결하는데 도움이 되고자 한다.

아크릴아미드 고정 구멍갈파래에 의한 중금속 Cu(Ⅱ), Zn(Ⅱ) 이온의 흡착특성-Column법

박광하,권영두,안중혁,김준범 7개 국립대학교 환경연구 논문집 공동발행 위원회 2004 공업기술연구 Vol.4 No.-

Adsoprtion characteristics of Cu(II) and Zn(II) heavy metal ions onto the Acrylamide-immobilized Ulva pertusa, a living algae of the castern coastal area, was examined in this work. Much amounts of heavy metal ions were adsorbed onto the Acrylamide-immobilized Ulva pertusa than the bare Ulva pertusa. It was also observed that Zu(II) was more readily adsorbed on the algae than Cu(II). The adsorption, but those were high dependent on pH value at high adsorbent concentration. The adsorption amounts of heavy metal ions were in the following order; pH 10.5>8.5>7.0>5.5>3.5. The maximun adsorption amounts of Cu(II) and Zu(II) onto 1g of Acrylamide-immobilized Uiva pertusa were 7.6㎎ and 8.1㎎, respectively. It was found that recovery yields of Cu(II) and Zn(II) ions were in the range of 36.1-64.8% and 32.1-63.8% depending on the pH level. In the heavy metal ions was well matched with the Freundlich adsorption isotherm.

안면부, 유방 및 상완부에 발생한 홍반성 루푸스 지방층염 1예

송유근,손두식,명형준,이현정,임중규,김순호,김윤아 朝鮮大學校 附設 醫學硏究所 2004 The Medical Journal of Chosun University Vol.29 No.2

Lupus erythematous panniculitis is a chronic inflammatory disease of subcutaneous fat that occurs in 2-3% of patients with systemic lupus erythematosus. Lupus erythematous panniculitis typically presents with firm, indurated subcutaneous nodules or plaques commonly developed in proximal extremities, trunks, head and neck. Face, breast and upper extremities involvement with lupus erythematous panniculitis has been infrequently reported. We report a case of lupus erythematous panniculitis developed in a 27-year-old female confirmed by histologic features and laboratory findings.

야뇨증 환아들의 심리사회적 특성에 대한 다기관 연구 : 행동 및 정서 문제를 중심으로

조수철,김재원,신민섭,황준원,한상원,박관현,이상돈,김경도,김건석,서홍진,이유식,정재용,김영균,문두건,남궁미경,한창희,조원열,김영식,배기수,이종국,정우영,신의진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6

Objectives : The aim of this study was to examine the behavioral and emotional problems associated with nocturnal enuresis in Korean children. Methods : Three hundred eighteen children with nocturnal enuresis, together with their parents, completed the Child Behavior Checklist (CBCL), Disruptive Behavior Disorder Scale according to DSM-IV (DBDS), Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self-Concept Scale (PHCSC). Ninety-three normal students were selected as the control group. Results : Compared to the normal control group, the mean scores with regard to the withdrawn, social problems, attention problems, delinquent behavior, aggressive behavior, externalizing problems and total problems profiles were significantly higher in the nocturnal enuresis group according to the CBCL results. The nocturnal enuresis group also scored significantly higher in the ADHD and ODD profiles of the DBDS. The nocturnal enuresis group was more depressed and anxious than the control group according to the results of the CDI and STAI. The mean score of the PHCSC was significantly lower in the nocturnal enuresis group when compared to the normal control group. Conclusion : The results of this study suggest that children with nocturnal enuresis in Korea have clinically relevant behavioral and emotional problems. The findings support the link between nocturnal enuresis and psychopathology in Korean children.

운동선수의 임장불안에 대한 연구

홍관이,이광재,김두경,부기원,노성규,한상준,박기동,오수일,문병용,이철규,박장평,엄기진,박남환 江原大學校附設 體育科學硏究所 1984 江原大學校附設體育科學硏究所論文集 Vol.- No.9

This study is designed to grasp the elements and situations of stage fright in order to propose a part of ways to cope with it. We make 511 top-class high school players, male and female, in the central districts (Seoul, Inchon, Kyungki, Chungbuk, and Kangweon Province) on object of questionnaire, and get the following results. Through players generally have all-round characters they show weakness in the superiority and emotional stability while showing strength in the sonformity. This fact comes to be related to the elements which cause stage fright. Physiological changes also have many effects on the symptom of stage fright. Especially, stage fright increases when players show sensitive reaction to the self-consciousness of final consequence which comes from the tension or uneasiness of sympathetic nerve, Thus, it turns out that players make use of reducing psychological burden by physical exercise or adjusting the level of demanded result in order to release the stage fright.

Accelerating CFD-DEM simulation of dilute pneumatic conveying with bends

Du, Jun,Hu, Guoming,Fang, Ziqiang,Gui, Wenjie Korean Society for Fluid machinery 2015 International journal of fluid machinery and syste Vol.8 No.2

The computational cost is expensive for CFD-DEM simulation, a larger time step and a simplified CFD-DEM model can be used to accelerate the simulation. The relationship between stiffness and overlap in non-linear Hertzian model is examined, and a reasonable time step is determined by a new single particle test. The simplified model is used to simulate dilute pneumatic conveying with different types of bends, and its applicability is verified by compared with the traditional model. They are good agreement in horizontal-vertical case and vertical-horizontal case, and show a significant differences in horizontal-horizontal case. But the key features of particle rope formed in different types of bends can be obtained by both models.

Accelerating CFD-DEM simulation of dilute pneumatic conveying with bends

Jun Du,Guoming Hu,Ziqiang Fang,Wenjie Gui 한국유체기계학회 2015 International journal of fluid machinery and syste Vol.8 No.2

The computational cost is expensive for CFD-DEM simulation, a larger time step and a simplified CFD-DEM model can be used to accelerate the simulation. The relationship between stiffness and overlap in non-linear Hertzian model is examined, and a reasonable time step is determined by a new single particle test. The simplified model is used to simulate dilute pneumatic conveying with different types of bends, and its applicability is verified by compared with the traditional model. They are good agreement in horizontal-vertical case and vertical-horizontal case, and show a significant differences in horizontal-horizontal case. But the key features of particle rope formed in different types of bends can be obtained by both models.

Study on Drivers to Finalcial Value of Vision-typed Loss Companies in China

DU Yong,DU Jun 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10

The research on assessing the value of loss listed companies at home and abroad is still at a preliminary stage. The scope of the study was too narrow and only takes into account the impact of the impact of the loss of the value of the company"s own company, and most of them confined to the financial characteristics of factors. From the point of view on investor’s expectation, the article focused in the analysis of vision-typed loss-listed companies in the reorganization of the executive changes, related-party transactions, the major shareholder of the rescue, dividend distribution of surface materials, such as the value of the drivers. The article first theoretically analyzed financial value drivers for vision-based loss companies, and them selected vision-based loss listed companies meeting the conditions “ESP〈0, BVPS≥0, EPCE≥0” from 2003 to 2007 occurred loss as samples, empirically analyzed how earnings per share, per share net asset, per share of net operating cash flow, the reconstruction of events anticipated, expected related-party transactions, expected executives change and major sharesholders expected to rescue affect the value of vision based loss listed companies. The study found that earnings per share had significant negative drive to financial value of a vision based loss listed company, per share of net operating cash flow, the reconstruction of the events anticipated, the dividend payment, shareholders are expected to rescue have significantly positive effects-driven to the financial value vision-based loss listed companies.

An Investigation of the Performance of Waterjet for Lotus Root Digging Device : Simulation and Experiment

Jun Du,Junfang Xia,Hao Wu,Wenqiang Xu 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.1

The agricultural digging device for lotus root make waterjet scour away the soil around lotus root to help it float up to water surface by buoyancy on harvesting . The performance of the waterjet was investigated by CFD-DEM simulation and experiment for its optimization. The Hertz-Mindlin with JKR model was used as the soil around lotus root was cohesive. The simulation shoes that the digging depth increases with the increase of the jetting angle and the decrease of the diameter of nozzle. The preliminary trial verified this trend, and it revealed that the digging depth determined the digging ratio. In the field experiment, the effects of type of nozzle, diameter of nozzle and jetting angle on digging depth, digging ratio, breaking ratio and surface damage ratio were studied. The results showed that a larger diameter with a larger jetting angle for a suitable type of nozzle can obtain a high digging ratio with a lower breaking ratio and surface damage ratio.