실내 라돈환경계의 선량감도분석에 의한 제어매개변수 모델링

주운표,장시영,김건중 대한방사선 방어학회 1991 방사선방어학회지 Vol.16 No.2

라돈 및 붕괴생성물*의 호흡에 의한 인체 피폭선량의 제어가능성을 찾기 위해 다음과 같은 과정을 거쳤다. 1) 라돈에 관련된 기존모델을 토양 기공모델, 실내붕괴 모델, 폐선량계산모델로 분류해석하고, 2) topology이론에 따라 물리유추개념으로써 회로망으로 전환하여, 라돈환경계통을 정식화, 검증계산을 거쳐, 3) 모의계산으로 선량감도를 분석하여 최적매개변수의 범위를 모색하였다. 매개변수인 환기율, 침적율, 부착율가 제어범위내 변화될 때, 정식화된 111원 연립방정식의 해를 구하여 선량감도를 분석하였으며, 제어매개변수의 선량감도에 의한 효과를 3차원으로 도식화하였다. 본 연구 수행결과, 제어매개변수 변화에 따른 실내의 222Rn 및 Rn-D*의 농도 변화과정은 새롭게 해석할 수 있는 벡터감도단층모형으로, 일부 제어매개변수의 조합변화에 따른 선량감도는 3차원 그래프모형으로 나타낼 수 있었다. 선량감도의 3차원 그래프에서는 실내환경의 대표적 매개변수 값 범위에서 변곡점이 나타났으며, 일반적으로 높은 환기조건(>h-1)하에서는 공기정화에 의하여 선량이 전반적으로 증가되나, 불충분한 환기조건(<0.5h-1)하에서는 공기정화에 의하여, 선량이 40%정도로 감소되는 것으로 나타났다. (라돈 및 붕괴생성물은 이하 222Rn 및 Rn-D로 통일한다.) This paper aimed to analyse dose sensitivity to the controllable parameters of indoor radon(222Rn) and its decay products(Rn-D) by applying the input-output linear system theory. Physical behaviors of 222Rn & Rn-D were analyzed in terms of 222Rn gas-generation, -migation and -infiltration to indoor environments, and the performance output-function, i.e. mean dose equivalent to Tracho-Bronchial(TB) lung region, was assessed to the following extented ranges of the controllable paramenters; a) the ventilation rate constant(λv): 0∼50[h-1]. b) the attachment rate constant(λa) : 0∼500[h-1]. c) the unattached-deposition rate constant(λ??) : 0∼50[h-1]. A linear input-output model was reconstructed from the original models in literatures, as follows, which was modified into the matrices consisting of 111 nodal equations ; a) indoor 222Rn & Rn-D Behaviour ; Jacobi-Porstendoerfer-Bruno model. b) lung dosimetry ; Jacobi-Eisfeld model. Some of the major findings, which identify the effectiveness of the model, were as follows. a) λv is most effective, dominant controllable parameters in dose reduction, if mechanical ventilation is applied, due to 222Rn gas removal effect. b) λa, depending on the air particle-concentration, reduces the dose somewhat within λv<1 h-1 range. However, the dose increases conversely, λv>1 h-1 range. c) λ?? reduces the dose linearly as λv does. Such dose(z-axis) senstivities could be understood with three-dimensional plots whose x,y-axes are combined 2 out of the 3 paramenters(λv, λa, λ??).

歷史에 있어서 原因과 理由

이운형 동국대학교 철학회 1983 哲學思想 Vol.5 No.-

效率的인 戰略情報시스템 設計

권영직,신운철 대구대학교 산업기술연구소 1993 産業技術硏究 Vol.12 No.-

To achive the competitive advantage under dynamic environment, the designing and implementing of Strategic Information System(SIS) is essential issues in business organization. Thus this thesis designed to provide some guidelines for design of effective SIS.

지방족 C -아민류 추출제에 의한 유기산의 반응 추출

이한섭,강안수,류운형 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-

The effects of extractant species, concentration, solvent and temperature on the degree of extraction were investigated, and also the effects of concentration of stripping phase and temperature on the degree of re-extraction were investigated in physical and reactive extraction system using equilibrium extraction unit. The used organic acids were acrylic acid, methacrylic acid, pyruvic acid, α-ketoglutaric acid, and the extractants were n-octylamine(OA, primary amine), di-n-octylamine(DOA, secondary amine), tri-n-octylamine(TOA, tertiary amine) and Aliquat 336. (TOMAC, quaternary ammonium salt). N-butylacetate(n-BAc), methyl-isobutyl-ketone(MIBK), chloroform, xylene and kerosene were used as solvents. The effect of the degree of re-extraction was investigated using alkaline solution of NaOH and Na₂CO₃. We found that the degree of extraction for reactive extraction was 2∼9 times than that for physical extraction and that the effect of extractants on the degree of extraction of organic acid was the order of OA>TOMA>DOA>TOA. And the degree of extraction was increased with increasing the concentration of extractants. In solvent effect, solubility parameter was more effective than dielectric constant of solvent, and the degree of extraction increased as the difference of solubility parameter of solvent and solute decreased, therefore the order was kerosene>xylene>chloroform>MIBK>n-BAc. Also, the degree of re-extraction increased with decreasing basicity of stripping phase, therefore, the degree of re-extraction for re-extraction of organic acid was higher in Na₂CO₃solution than in NaOH solution. As a result of the effect of temperature, the degree of extraction was decreased and re-extraction was increased with increasing temperature, respectively.

RAM(Range Adjusted Measure)을 이용한 부품소재 기업들의 생산성 분석 및 R&D 현황에 관한 실증연구

이정동,백철우,이운규 한국생산성학회 2004 生産性論集 Vol.18 No.2

Increased global sourcing and reorganization in high value-added-centered industries make parts and material industry, which forms 46% of total production and 40% of total exports in manufacturing sector, more important. In a sense that parts and material industry is . vulnerable in spite of its consequence, a lot of policy support was given. Parts and material industry, however, has never been researched empirically in firm level, therefore in this research we would like to analyze the competitiveness of parts and material firms compared with manufacturing sector, and to inquire into their current R&D position. Consequently, we suggest how to make value-added products more efficiently through R&D.

손마사지가 허혈성 심질환 환자의 불안에 미치는 효과

현경선,이향련,공송심,윤경자,김현섭,김효남,최지원,김운정 성인간호학회 2001 성인간호학회지 Vol.13 No.2

The purpose of this study was to investigate the effect of a hand massage program on anxiety, vital sign and pain in clients with ischemic heart disease. The design utilized for this stuffy was quail-experimental with a nonequivalent control group non-synchronized design The subjects were fifty-four patients, twenty-eight for the experimental and twenty-six for the control group, who were admitted with ischemic heart diease at a cardiac intensive care unfit in K medical center of K university. This study was carried out from May, 1999 to March, 2000. The level of anxiety and pain measured by Visual Analogue Scale, systolic blood pressure, diastolic blood pressure and pulse rate were measured before and after hand massage, the state of Anxiety was measured by the Spielberger (1970) scale at admission and after hand massage for three days. The collected data were processed by using the SPSS PC program and analyzed using χ2-test and t-test. The result of this study are as follows : 1. The scores of VAS anxiety and State of anxiety of the experimental group were lower than those of the control group. 2. The degree of systolic blond pressure, diastolic blood pressure and pulse rate of the experimental group were lower than that of the control group. 3. The score of VAS pain of the experimental group was lower than that of the control group. The results suggested that hand massage can decrease VAS anxiety, State of anxiety, vital signs and VAS pain of patients who were admitted with ischemic heart disease at cardiac intensive care unit Therefore, It Is proposed that hand massage is an appropriate nursing intervention to relieve anxiety of the patients who were admitted with ischemic heart disease at a cardiac intensive care unit.

Flourishing creativity: education in an age of wonder

Oon Seng Tan 서울대학교 교육연구소 2015 Asia Pacific Education Review Vol.16 No.2

The twenty-first century is often described as an age of uncertainty and ambiguity with unprecedented challenges. Those with a creative mind-set however might call this millennium an age of wonder. New technologies and digital media are facilitating imagination and inventiveness. How are we innovating education? Are schools and classroom fostering creativity? This chapter will discuss the understanding of the cognitive functions of creativity and relate these to curriculum and pedagogy. It will deal with issues such as tapping on the powers of psychological habits and novelty, contextualizing learning, providing for serendipity, imagination, and play.

Viral Hepatitis : Diagnosis, Management and Control in the Asian-Pacific Region

Oon, Chong Jin Medical Publications Korea 1979 Medical Progress Vol.6 No.7

Viewpoint from Singapore

Oon, Chong Jin Medical Publications Korea 1986 Medical Progress Vol.8 No.3

Hepatitis B Vaccinations : Are Boosters Indicated?

Oon, Chong-Jin Medical Publications Korea 1990 Medical Progress Vol.12 No.4