감마 분광 분석을 이용한 환경 시료 중 ^(226)Ra 및 ^(232)Th 방사능농도 검증

강태우,고정대 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-

The objective of this study was to get the reliable data and to improve nuclear analytical techniques. The gypsum and soil samples was obtained from Korea Institute of Nuclear Safety(KINS), the measurement of ^(226)Ra and ^(232)Th activities were performed by gamma-ray spectrometry system consisted with a high purity germanium(HPGe) detector. Their activities showed a good agreement within the confidence intervals and were evaluated to be reliable. Therefore, the results obtained in this study can be useful for measurement of ^(226)Ra and ^(232)Th activities in the environmental sample using HPGe gamma-ray spectrometry. 본 실험은 환경방사능 분석 기술의 능력 검증과 신뢰도를 확보하기 위하여 석고와 토양 시료를 KINS로부터 제공받아 고순도 게르마늄 검출기로 구성된 감마 분광계를 이용하여 분석하였다. 분석 핵종은 석고 중 ^(226)Ra과 토양 중 ^(232)Th 감마핵종이었으며, 이들 분석 값들은 모두신뢰도 범위내의 값을 보였다. 따라서 고순도 게르마늄검출 시스템을 이용한 환경 시료 중 ^(226)Ra과 ^(232)Th 방사능 농도를 분석할 수 있는 능력을 갖출 수 있었다.

Modal SI 기법 적용을 위한 최적 측정위치 선택

강태우,권순정,김용현,신수봉 東亞大學校 建設技術硏究所 2001 硏究論文集 Vol.25 No.2

In applying a modal system identification with a limited number of measuring degrees of freedom, the selection of optimal sensor locations (OSL) is critical for a good identification. The current research proposes a new OSL method applicable to a modal system identification (SI) and compares it with a widely used OSL method. The proposed method utilizes the sensitivity of eigenvectors with respect to the structural parameters. A simulation study for a tower structure has been carried out to demonstrate the efficiency of the proposed method. Through the simulation study, the influence of OSL on the structural parameters estimated by a S1 method are investigated.

제주도 토양의 감귤나무(Citrus unshiu Marc.)에서 ^137Cs의 전이

강태우,박원표,송성준,유장걸 제주대학교 방사능이용연구소 2001 연구보고 Vol.15 No.-

본 연구는 제주도 토양 감귤나무에서 ^137Cs의 전이를 조사하기 위하여 유기물 함량이 서로 다른 제주도내 6개 지역의 감귤원에서 채취한 감귤과 토양시료를 감마분광계로 ^137Cs 농도를 측정하였고, 또한 토양화학 특성과의 관계를 조사하였다. 토양 중 ^137Cs 농도는 10.2∼40.0 Bq/kg dry 범위로, 유기물 함량이 높을수록 높은 경향을 보였다. 식물체 중 ^137Cs 농도는 가식부위의 경우는 검출하한치 이하 ∼91.8 mBq/kg·fresh, 잎은 검출하한치 이하 ∼235 mBq/kg·fresh의 범위로 가식부위, 껍질 그리고 잎 순으로 높았다. 토양에서 식물체로의 ^137Cs 전이계수는 잎, 껍질 그리고 가식부위에서 각각 2.15×10^-3∼1.25×10^-2, 7.28×10^-4∼8.13×10^-3 그리고 3.79×10^-4∼3.08×10^-3 범위로 가식부위, 껍질 그리고 잎 순으로 높았다. 토양 pH에 따른 ^137Cs의 전이계수는 서로 상관성이 없었으나, 치환성 K와 토양 유기물 함량이 높을수록 전이계수는 낮아지는 경향이 있었다. 우리 나라 국민 1인당 20 kg의 감귤을 섭취한다고 가정했을 때 이상의 결과로부터 산출된 흡수선량인 0.0048 μSv은 연간 예탁유효 선량 당량 값인 2.48 mSv에 비하여 거의 무시할 수 있는 수준이라고 생각된다. To investigate transfer of ^137Cs in the mandarin trees of Jeju Island, the fruits and leaves as well as the soil samples around each tree were collected from 6 mandarin orchards with different organic matter content. ^137Cs concentration was measured by HPGe γ-ray spectrometry, the relationship between the transfer values and the soil chemical properties was investigated. ^137Cs concentration in soil was in the range of 10.2~40.0 Bq/kg·dry and increased with increasing organic matter content. ^137Cs concentrations in each part of plant were in the range of MDA(minimum detectable activity)~46.8 mBq/kg·fresh(fruit), MDA~91.8 mBq/kg·fresh(peel) and MDA~235 mBq/kg·fresh(leaf), respectively. The distribution of ^137Cs in trees was showed as the following order; fruit<peel<leaf. Transfer factors of ^137Cs from soil to tree were in the range of 2.68×10^-3~1.02×10^-2, 9.07×10^-4~4.03×10^-3 and 4.73×10^-4 ~ 2.04×10^-3 for leaf, peel and fruit, respectively. The transfer factors were as the following order; fruit<peel<leaf. The transfer factors of ^137Cs from soil to tree were not affected by soil pH, but decreased at the high concentration of exchangeable K and organic matter.

世界平和와 韓國의 役割

姜永晧,李瑛雨,金宇泰 경북대학교 법정대학 1976 法大論叢 Vol.14 No.-

World peace is an ideal which mankind has been searching for a long time. The League of Nations and the United Nations, established after World War Ⅰ and Ⅱ respecetively, were the results of the desire of peace-loving people attempting to solve international disputes and conflicts by peaceful means. Following the end of World War Ⅱ through 1950's the world has experienced a period of Cold War, replaced by an era of peaceful co-existence during 1960's. In 1970's the thaw in the struggle among big powers developed which further lessened the likelihood of war among the super powers. Taking advantage of improving international atmosphere, however, north Korean Communists have disguised themselves as the champion of peace and offered many so-called "peaceful unification formulas", thus misleading the world opinion. It is the objective of this paper to correct the misinformation concerning the problem of peace in Korea and to reveal true motive of the north Korean Communists by clarifying ROK's position on the issue of peaceful unification of the Korean Peninsula. Chapter Ⅰ is an introduction to this paper stating the problems and issues to be discussed in the paper. Chapter Ⅱ deals with putting Korean people's view of peace on the basis of the world peace by making clear the true idea of peace through historical development of peace theory in western history and searching the types of the world peace. Chapter Ⅲ is a study of peaceful nature of Korean people from the perspectives of Korean history. In order to make an effective analysis on above issue the Chapter is divided into three parts: first, a brief examination of the origin of Korean race; second, a study of Korean history based on mythology such as "Hong-Ik In-Gan" philosophy found in Dan-Gun myth and "So-Do" philosophy prevelant during the period of Three Hans; third, a historical recollection of numerous invasions of the Korean Peninsula by foreigners and yet the fact that at no time had Korea invaded its neighboring countries. Chapter Ⅳ deals with a period since the second World War, and particulary since the establishment of the Republic of Korea in 1948, in which the Korean Government, inheriting the spirit of peaceful nature of its people, has been pursuing peace. The Chapter is divided into two parts. The first deals with the period up to 1970 during which the R.O.K. was established (in 1948), the Korean War was erupted (in 1950), and the normalization of relations between Kore and Japan was achieved (in 1965). Internally, political stability and economic growth were realized in order to establish a firm base for an eventual peaceful unification of the Peninsula. Externally, this period saw the Republic of Korea expanding its diplomatic activities by establishing multilateral relationship with foreign countries. Since the beginning of the 1970's. President Park Chung Hee has universally published a series of epock-making plans to settle peace on the Korean Peninsula. President Park's August 15 Declaration (1970), a south-north joint communigue´ (1972), the declaration of a new foreign policy for peace and peaceful unification (1973), the proposal of non=aggression pact between the south and north (1974), and the proposal of three basic principles for peaceful unification (1974)-these are the expressions of the R.O.K.'s efforts to settle peace on the Peninsula and to contribute actively to the world peace. By studying the contribution of Korea to the world peace, it is hoped that the efforts by the Korean Government by clearly understood and this article would contribute in a small way toward the eventual unification of the Korean Penininsula.

Pd 촉매하에서 allylic alcohol과 hypervalent iodine 화합물의 위치 선택적 vinylation에 관한 연구

강석구,이홍우,장수범,김태현,편성재 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2

The formation of carbon-carbon bond by palladium-catalyzed coupling of aryl or vinyl halides with olefins, known as the Heck reaction, has become a powerful tool in organic chemistry. In the case of allylic alcohols, palladium-catalyzed reaction of organic halides usually affords β-substituted ketones or aldehydes rether than β-substituted allylic alcohols.

Hydrogen Behavior in Ti-Added Reduced Activation Ferritic-Martensitic Steels

Kang‑Mook Ryu,Dae Geon Lee,Joonoh Moon,Chang‑Hoon Lee,Tae‑Ho Lee,Jae Sang Lee,Dong‑Woo Suh 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.3

Hydrogen behavior and corresponding mechanical degradation were examined in TaTi-RAFM and EUROFER97 steels. Increased Ta content with Ti addition decelerates the hydrogen diffusion but increases the solubility in the lattice. It ismainly led by the higher fraction of Ta-rich MC carbides and dislocation density in TaTi-RAFM steel. Overall activationenergy of hydrogen trapping of investigated steels is evaluated to be 25.3 ~ 25.6 kJ/mol in the tempered condition. The activationenergy increases to nearly 30 kJ/mol when the steels are re-austenitized and quenched. Higher activation energy withincreased dislocation density indicates that the dislocation provides for trap site with higher activation energy than Ta-richMC carbide. Mechanical degradation by hydrogen with respect to the yield strength, tensile strength and uniform elongationcould not be observed in all investigated steels. The presence of hydrogen only has influence on the loss of post-uniformelongation. For a given charging time, the loss of post-uniform elongation is more remarkable in TaTi-RAFM steel due tothe larger hydrogen uptake.

도시지역 한방의료이용자의 질병양상 조사연구

강영우,조태현,김병하,남철현,조남춘,안창수,이재홍 慶山大學校 保健福祉硏究所 1997 保健福祉硏究 Vol.1 No.-

To provide the basic data for improving of curative measures in oriental medicine and for developing of health education and preventive program after understanding of classification of diseases in oriental medicine users, questionnaire interview was carried out with city dwellers, over 20 years old, selected randomly in big cities from 2nd Oct. to 11th Nov. 1995. The results were summarried as follows: 1. In the general characteristics of subjects, the highest portion of each part was 61.2% of female, 25.5% of thirties, 28.5% of high school graduate, 63.3% of middle class and 11.8% of lower class in economic status. 31.9% was housewife, 73.5% was merried and 55.1%, 38.1% came from big or small cities each. 2. By 21 classification of diseases, 19.7% was blood disorders, 17.6% was pregnancy & delivery complications and 15.2% was endorine & nutritional disorders. 3. As for age 22.6% of endocrine & nutritional disorders in twenties, 20.8%, 28.1%, 27.8% of blood & defence mechanism disorders in thirties, forties, sixties each and 24.9% of pregnancy & delivery complications in fifties were the higher than the other groups. 4. By educational level, 47.8%, 30.5% of blood & defence mechanism disorders in uneducated and middle school graduate were the higher than the other groups. 5. As for occupation, 20.8%, 32.9% of blood & defence mechanism disorders in housewives and sales each, were the higher than the other groups. 6. By economic status, 20.2% of blood & defence mechanism disorders in middle and high class, were the higher than the other groups. 7. By marital status, 21.3% of endocrine & nutritional disorders in singles, 22.0%, 25.7% of blood disorders in having partners, were the higher than the other groups. 8. As for living areas, 18.2% of pregnancy & delivery complications in big city dwellers, 21.3% of endocrine & nutritional disorders in town dwellers were the higher than the other groups. The distribution of diseases in oriental medicine users wes very different by chracteristics according the results. So It's important and essential project to improve curative technics and to develop.

단순 스무딩 스플라인 함수 추정

강상길,이우동,윤용화,김종태 慶山大學校 基礎科學硏究所 1998 基礎科學 Vol.2 No.1

본 논문의 목적은 선형 스무딩 스플라인에 대한 단순하고 구체화된 형태를 제안하고, 구체화된 선형 스무딩 스플라인 형태를 통하여 스무딩 스플라인의 특성을 이해하고는 어떻게 비모수 함수 추정량의 도구로서 사용될 수 있는지를 보인다. 또한 예제를 통하여 다른 비모수적 추정량들과 비교하였다. In this paper, we give simple and closed form of linear smoothing spline. Through the form, we understand the characteristics of smoothing spline, and show that how the smoothing spline can be used as a tool for estimator of nonparametric functin. And an example is given for comparison of our esttimator with another nonparametric estimators.

濟州地域 土壤中 Cs-137과 K-40 방사능 함량

강태우,송성준,유장걸 제주대학교 방사능이용연구소 1999 연구보고 Vol.13 No.-

Radioactivities of Cs-137 and K-40 in Cheju soils were determined using multichannel analyzer with Ge detector. Cs-137 level in soils was 2.75 to 166 Bq/kg, Its average was 44.9 Bq/kg showing 1.83-fold higher than in mainland. There were the regional variations that Sogwipo-shi had the highest value of Cs-137 (56.1 Bq/kg) and Bukcheju-gun had the lowest one(30.8 Bq/kg). K-40 level in Cheju soils was 10.1 to 984 Bq/kg, being 2.47-fold lower than in mainland. There also were the regional variations that Cheju-shi had the highest value of K-40 (412 Bq/kg) and Namcheju-gun had the lowest one(220 Bq/kg).

호산구성 간농양 54예의 임상상

강혜련,권혁수,송우정,이상민,김태범,박혜경,장윤석,김윤근,조상헌,민경업,김유영 대한알레르기학회 2004 천식 및 알레르기 Vol.24 No.2