대사증후군과 전립샘비대증: 대사증후군 개별요소와 전립샘용적, 전립샘특이항원의 상관관계를 통한 고찰

장택환,손정환,김재일,장석흔 대한비뇨의학회 2008 Investigative and Clinical Urology Vol.49 No.11

Purpose: To evaluate the relationship between metabolic syndrome and benign prostatic hyperplasia in Korean men, we investigated the relation between prostate volume and the serum prostate specific-antigen (PSA) level with the factors for metabolic syndrome. Materials and Methods: We reviewed the data of 1,412 men who had a general health check-up without significant evidence of disease between January 2004 and May 2007. The age, prostate volume, PSA, PSA density and metabolic factors were measured, and the relationships of these factors were evaluated. We also compared the prostate-related data between the metabolic syndrome(MS) group and non-metabolic syndrome(NMS) group. Results: The prostate volume was significantly larger in the MS group (23.0±7.1ml) than that in the NMS group(20.9±6.1ml)(p<0.001). There was no statistically significant difference of the PSA level between the two groups(MS group: 0.86±0.66, NMS group: 0.90±0.81), but the PSAD was significantly different between the two groups(MS group: 0.038±0.027, NMS group: 0.044±0.031)(p=0.0035). We concluded that there was a significant correlation between the prostate volume and the metabolic syndrome factors. However, when analyzing the influence of each metabolic syndrome factor on the prostate volume, only the BMI was a relatively influential factor. Conclusions: Our study showed that there was significant correlation between each metabolic syndrome factor and the prostate volume. This seemed to be the result of the commonly related pathophysiology of MS and an enlarged prostrate volume, and obesity was a significant factor. It was meaningful that the PSA level in the MS group was lower than that of the NMS group in case of the same prostate volume. Purpose: To evaluate the relationship between metabolic syndrome and benign prostatic hyperplasia in Korean men, we investigated the relation between prostate volume and the serum prostate specific-antigen (PSA) level with the factors for metabolic syndrome. Materials and Methods: We reviewed the data of 1,412 men who had a general health check-up without significant evidence of disease between January 2004 and May 2007. The age, prostate volume, PSA, PSA density and metabolic factors were measured, and the relationships of these factors were evaluated. We also compared the prostate-related data between the metabolic syndrome(MS) group and non-metabolic syndrome(NMS) group. Results: The prostate volume was significantly larger in the MS group (23.0±7.1ml) than that in the NMS group(20.9±6.1ml)(p<0.001). There was no statistically significant difference of the PSA level between the two groups(MS group: 0.86±0.66, NMS group: 0.90±0.81), but the PSAD was significantly different between the two groups(MS group: 0.038±0.027, NMS group: 0.044±0.031)(p=0.0035). We concluded that there was a significant correlation between the prostate volume and the metabolic syndrome factors. However, when analyzing the influence of each metabolic syndrome factor on the prostate volume, only the BMI was a relatively influential factor. Conclusions: Our study showed that there was significant correlation between each metabolic syndrome factor and the prostate volume. This seemed to be the result of the commonly related pathophysiology of MS and an enlarged prostrate volume, and obesity was a significant factor. It was meaningful that the PSA level in the MS group was lower than that of the NMS group in case of the same prostate volume.

자기공명영상을 이용한 한국인 20대 표준 뇌부피 계측과 임상적 활용을 위한 기초 연구

유임주,권지예,전재정,고인송 국립보건연구원 2000 국립보건원보 Vol.37 No.-

한국 수출액과 수입액이 한국 유가증권시장에 미치는 상호 영향력 변화에 관한 연구

임병진(Byung-Jin Yim) 한국무역연구원 2016 무역연구 Vol.12 No.5

This empirical study focuses on the mutual influence among Korea’s stock market, export volume and import volume index. We examine the interdependence of Korea’s stock market, export volume and import volume index using 436 monthly data or observations from January 31, 1980 to April 30, 2016. The Granger causality model based on the vector autoregression model and the Johansen cointegration test are employed. Impulse response function based on the VAR model as well as variance decomposition were employed after the unit root tests, cointegration test and Granger causality test. Results showed from basic statistical analysis that Korea’s stock market index, export volume index and import volume have unit roots. In addition, there is at least one cointegration among them. Lastly, we find that Korea’s stock market index granger-causes Korea’s export volume and import volume and Korea’s export volume granger-causes Korea’s import volume.

주요 수종별 재적의 상업적 이용율 추정

손영모 ( Yeong Mo Son ),강진택 ( Jin Taek Kang ),원현규 ( Hyun Kyu Won ),전주현 ( Ju Hyun Jeon ) 한국임학회 2016 한국산림과학회지 Vol.105 No.3

본 연구는 중부지방소나무 등 주요 5개 수종에 대하여 상업적으로 이용가능한 재적율인 조재율을 구하기위하여 수행되었다. 본 연구에 이용한 자료는 최소 1,300여본 이상의 전국적인 조사자료를 이용하였으며, 적용한 추정식은 임목재적 중 목질부 재적을 나타내는 목질부 재적율 추정식과 목질부 재적에 대한 이용재적을 나타내는 원목이용율 추정식이었으며, 이 두가지 추정식의 곱으로 조재율을 도출하였다. 흉고직경에 의한 목질부 재적율(W)은W= {a _{1}} over {1+a _{2/D}} + {b _{1}} over {1+b _{2/D}} 의 모형을 이용하였으며, 이 식의 적합도는 수종별로 99% 이상이었고 기타 검정통계량도 식의 적합성을 충분히 설명하고 있었다. 목질부 재적에 대한 원목이용율(M)은W=e ^{a _{1} LEFT ( {d} over {D} RIGHT ) ^{a _{2}}} - LEFT ( b _{0} +b _{1} D+b _{2} D ^{2} +b _{3} D ^{3} RIGHT ) 모형을 적용시켜 적합도는 수종별로 96% 이상이었다. 이 두가지 추정식을 이용하여 5개 수종별로 상업적 재적이용율인 조재율을 산정하고 조재율표를 작성하였다. 분석결과, 조재율은 침엽수와 활엽수 임상별로는 거의 차이가 없는 것으로 나타났으나, 기존 침엽수, 활엽수 조재율과의 차이는 있는 것으로 나타났다. This study was conducted to derive merchantable volume ratio for 5 major species such as Pinus Densiflora (Central Region). The data used for this study was from at least more than 1,300 trees of research data throughout the country. the study applied two estimation equations, which were the estimation equation for wood volume ratio representing total wood volume to total tree stem volume and the estimation equation for merchantability representing ratio of merchantable volume to total wood volume. The merchantable volume ratio was derived by multiplying those two estimation equations. In order to gain wood volume ratio(W) from DBH,W= {a _{1}} over {1+a _{2/D}} + {b _{1}} over {1+b _{2/D}} model was used. Fitness index of it was more than 99% by species, and other test statistics also indicated the suitability of this equation enough. Merchantability (M) for wood volume applied W=e ^{a _{1} LEFT ( {d} over {D} RIGHT ) ^{a _{2}}} - LEFT ( b _{0} +b _{1} D+b _{2} D ^{2} +b _{3} D ^{3} RIGHT ) model and fitness index was more than 96% by species. Merchantable volume ratio was assessed using those two estimation equations by each 5 species, and constructed a merchantable volume ratio table. In result, merchuntable volume ratio was little difference between stand types, but there was slightly different with the existing standard such as conifers of 85% and non-conifers of 70%.

인터넷 검색빈도와 아파트 거래량 간의 선행-후행 관계

유한수(Yoo, Han-Soo) 한국부동산정책학회 2020 不動産政策硏究 Vol.21 No.1

The aim of this paper is to investigate empirically the lead-lag relation between Internet search volume(Naver Trend Index) and trading volume of apartment. The Internet is the main source of information gathering. The increase of Internet search volume on something means the increase of people’s interest in something. Previous studies in this topic examine the relationship between Internet search volume and the released trading volume of apartment. The distinguishing feature of this empirical study is that it investigates the relation between Internet search volume and the fundamental trading volume of apartment, and the relationship between Internet search volume and the transitory trading volume of apartment. The first step of this empirical study is to decompose released trading volume into fundamental trading volume and transitory trading volume. The second step is unit root test. The third step is Granger causality test. The results of Granger causality test reveal that Internet search volume Granger causes released trading volume of apartment, and the fundamental trading volume of apartment. And there exists one-way Granger causality from Internet search volume to the transitory trading volume of apartment. The fourth step, the impulse response function analysis reveals that the shock of Internet search volume generally increases the magnitude of released trading volume, fundamental trading volume and transitory trading volume. The findings of this paper indicate that the movement of Internet search volume helps to estimate trading volume of apartment market. Therefore, the movement of Internet search volume can serve as an early market indicator.

Desorbed gas volume estimation using conventional well-log data for the Montney Formation, Deep Basin, Canada

Yang, Il Ho,Lee, Hyun Suk Elsevier 2018 Journal of petroleum science & engineering Vol.162 No.-

<P><B>Abstract</B></P> <P>This study focuses on desorbed gas volume estimation of the Montney Formation, Deep Basin, Canada. Because desorbed gas has significantly contributed to shale gas production, and ranges from 10% to 40% of the total production, an accurate desorbed gas volume estimation is important to evaluate and develop shale gas fields. The desorbed gas volume was calculated using two methods – the adsorption capacity (cf. Langmuir test) and canister volume measurements. Both methods were originally adopted from coal-bed-methane production and applied to shale gas reservoirs after the commercial production of shale gas. The Montney Formation contains less than 2% of total organic carbon, with an average of 0.7% primarily derived from the secondary cracking of migrated oil. This suggests the absence of the adsorption capacity and organoporosity of organic matter. Conversely, the Montney Formation contains more than 20% of clay minerals, and the canister volume test shows that the formation has 22 scf/ton of desorbed gas volume. Based on a mineralogical analysis, this desorbed gas is primarily adsorbed to clay minerals, such as illite, mica, smectite, kaolinite, among others. Because illite is the major component among the clay minerals and has a positive correlation to the canister volume, the illite volume was calculated from conventional well logs to estimate exact desorbed gas volume. We assumed that the clay volume primarily consisted simply of illite and the rest clay minerals and figure out the volume of illite by using neutron-density cross plot.</P> <P>The calculated illite volume has a positive correlation to the canister volume, which can be used to infer the desorbed gas volume of the Montney Formation. The estimated desorbed gas volume in the Montney Formation ranges from 19 to 30 scf/ton, which is lower than the free-gas volume.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Desorbed gas volume of Montney Formation is estimated from regression between the illite minerals and canister gas volume. </LI> <LI> The volume of illite minerals is calculated by neutron porosity and density logs cross-plot. </LI> <LI> The calculated illite group and desorbed gas volume from well logs is compared to core based illite minerals and canister gas volume, showing very similar trend. </LI> <LI> The proposed new method for low TOC shale gas reservoirs such as the Montney Formation can calculated desorbed gas volume. </LI> </UL> </P>

폐용적과 폐기능 환기장애에 대한 유의성 평가

김지율,예수영 한국방사선학회 2023 한국방사선학회 논문지 Vol.17 No.5

To In this study, we sought to evaluate related factors affecting lung volume and their significance in pulmonary function and ventilation disorders. As experimental subjects, 206 normal adult men and women who underwent a low-dose chest CT scan and a spirometry test were selected at the same time. The experimental method was to measure lung volume using lung CT images obtained through a low-dose chest CT scan using deep learning-based AVIEW. Measurements were made using the LCS automatic diagnosis program. In addition, the results of measuring lung function were obtained using a spirometer, and gender and BMI were selected as related factors that affect lung volume, and significance was evaluated through an independent sample T-test with lung volume. As a result of the experiment, it was confirmed that in evaluating lung volume according to gender, all lung volumes of men were larger than all lung volumes of women. he result of an independent samples T-test using the respective average values ​​for gender and lung volume showed that all lung volumes were larger in men than in women, which was significant (p<0.001). And in the evaluation of lung volume according to BMI index, it was confirmed that all lung volumes of adults with a BMI index of 24 or higher were larger than all lung volumes of adults with a BMI index of less than 24. However, the independent samples T-test using the respective average values ​​for BMI index and lung volume did not show a significant result that all lung volumes were larger in BMI index 24 or higher than in BMI index less than 24 (p<0.055). In the evaluation of lung volume according to the presence or absence of pulmonary ventilation impairment, it was confirmed that all lung volumes of adults with normal pulmonary function ventilation were larger than all lung volumes of adults with pulmonary ventilation impairment. And as a result of the independent sample T-test using the respective average values ​​for the presence or absence of pulmonary ventilation disorder and lung volume, the result was significant that all lung volumes were larger in adults with normal pulmonary function ventilation than in adults with pulmonary function ventilation disorder (p <0.001). Lung volume and spirometry test results are the most important indicators in evaluating lung health, and using these two indicators together to evaluate lung function is the most accurate evaluation method. Therefore, it is expected that this study will be used as basic data by presenting the average lung volume for adults with normal ventilation and adults with impaired lung function and ventilation in similar future studies on lung volume and vital capacity testing.

비정상 거래량의 측정 방법론에 관한 연구

강민,임지은 한국재무관리학회 2021 財務管理硏究 Vol.38 No.4

In this paper, we introduce several methodologies for measuring abnormal trading volume and compare each methodology's characteristics and the measuring performance of abnormal trading volume. As methodologies that utilize market trading volume, we present the OLS estimation method and GLS estimation method based on regression analysis and a method for calculating the abnormal trading volume by subtracting the market trading volume from individual trading volume. For the methodologies that do not use market trading volume information, we introduce the method of subtracting the average trading volume of stock from the trading volume of the stock, the method of calculating the ratio between the trading volume of a stock and the average trading volume of the stock, and Gervais et al. (2001) methodology. In the empirical analysis, we measure the abnormal trading volume for the Korean stock market from 2001 to 2020 using each methodology and comparing the performance. From this analysis, we show that the rate of judging the abnormal trading volume of the same stock as an event of extremely high or low trading volume differently reached 5.9 to 66.4%, and there is a significant difference in the results of comparing the performance of portfolios made of these stocks. These results suggest that the abnormal trading volume measurement should be carefully selected according to the purpose of the analysis. 본 연구는 비정상 거래량을 측정하는 여러 방법론을 소개하고, 각 방법론의 특성과 비정상 거래량의측정 성과에 대해 비교한다. 비정상 거래량의 측정 방법론으로는 시장 거래량 정보를 활용하는 방법론인회귀분석을 기반으로 한 OLS 추정법, GLS 추정법 및 개별거래량에서 시장 거래량을 차감하여 산출하는방법을 제시하였고, 시장 거래량 정보를 활용하지 않는 방법론으로는 개별 주식의 거래량에서 해당주식의 평균 거래량을 차감하는 방법, 나누어 비율을 구하는 방법, Gervais et al.(2001)의 비정상 거래량판별법을 제시하였다. 실증분석에서는 2001~2020년의 한국 주식시장을 대상으로 위 방법론을 사용하여비정상 거래량을 측정하고, 극단적으로 높거나 낮은 거래량에 대한 판별 성과를 비교하였다. 분석결과, 방법론에 따라 동일 주식의 비정상 거래량을 극단적으로 높거나 낮은 거래량의 발생 사건으로서로 달리 판정하는 비율이 5.9~66.4%에 달하며, 해당 주식들로 이루어진 포트폴리오의 수익률을비교한 결과에서도 각 방법론 간 유의미한 차이가 나타남을 확인하였다. 이러한 결과는 분석의 목적에따라 비정상 거래량의 측정 방법을 신중하게 선택해야 함을 시사한다.

환율의 컨테이너 수입 물동량에 대한 비대칭적 영향에 관한 연구

임상수 한국해양수산개발원 2015 해양정책연구 Vol.30 No.2

This study is interested in the asymmetry in the effect of the won-dollar exchange rate on the container import volume in Korea. At first, this paper found out the container import volume and the exchange rate which are time series data have unit roots and the cointegration relationship. This means that there is the long run relationship between the container import volume and the exchange rate. So the ECM(Error Correction Model) was used to estimate the function of the container import volume. And GARCH(Generalized Autoregressive Conditional Heteroskedasticity) model should be used because the variance of the error term is varying with time according to the result of the estimation of the container import volume function. In this paper, the asymmetry in the effect of the exchange rate on the container import volume is tested. ECM-GARCH Model was used to test the asymmetry. There are some several meaningful results. Firstly, the response of the import volume by the increase of the exchange rate is the same as the response of the import volume by the decrease of the exchange. It means that the effect of the exchange rate on the container import volume is symmetric. Secondly, the exchange rate at the period t-1 has the significant effect on the container volume at the period t when the exchange rate is increasing, but the exchange rate at the period t has the significant effect on the container volume at the period t when the exchange rate is decreasing. Lastly, the container import volume adjusts to long-run equilibrium level at the bad news but it does not adjust to long-rum equilibrium level at the good news. 본 연구는 원/달러 환율이 컨테이너 수입 물동량에 미치는 영향에 대한 비대칭성을 검정하는 것을 목적으로 하고 있다. 먼저, 본 연구는 컨테이너 수입 물동량과 원/달러 환율 시계열 데이터는 모두 단위근을 가지고 있어 공적분 검정을 수행한 결과, 공적분 관계에 있다는 사실을 밝혔다. 이는 컨테이너 수입 물동량과 환율 사이에 장기 균형 관계에 있다는 것을 의미하며, 이 때문에 컨테이너 수입 물동량 함수를 추정하기 위해서는 오차수정모형(ECM: Error Correction Model)을 설정해야한다. .또한 오차수정모형 추정 결과 추정 오차항은 시간에 따라 변하기 때문에, 일반화된 조건부 자기 회귀 모형으로 추정되어야 할 필요성이 있는 것으로 나타났다. 다음으로 이렇게 설정된 ECM-GARCH 모형으로 컨테이너 수입 물동량 함수를 추정한 결과를 바탕으로 컨테이너 수입 물동량에 대한 원/달러 환율 영향의 비대칭성을 검정했다. 그 결과 몇가지 의미있는 사실을 알 수 있었다. 먼저, 원/달러 환율의 상승에 의한 컨테이너 수입 물동량의 반응은 원/달러 환율의 하락에 의한 반응과 같았다. 이것은 원/달러 환율이 컨테이너 수입 물동량에 미치는 영향은 상승기와 하락기 대칭적이라는 것을 의미한다. 두번째로, 환율 상승기에는 t-1기 원달러 환율이 t기 컨테이너 수입 물동량에 미치는 영향은 통계적으로 유의한 반면, 환율 하락기에는 t기 원/달러 환율이 t기 컨테이너 수입 물동량에 미치는 영향이 통계적으로 유의한 것으로 나타났다. 마지막으로 컨테이서 수입 물동량은 악재에 대해서는 장기 균형으로 회복하려는 경향이 있었지만, 호재에 대해서는 장기 균형을 회복하려는 경향이 없는 것으로 나타났다.

유방암의 접선 조사시 피폭 폐용적

오영택(Young Taek Oh),김주리(Juree Kim),강해진(Haejin Kang),손정혜(Jeong Hye Sohn),강승희(Seung Hee Kang),전미선(Mison Chun) 대한방사선종양학회 1997 Radiation Oncology Journal Vol.15 No.2

목 적 : 유방암의 방사선 치료에서 가장 유의하여 할 사항 중의 하나인 방사선 폐렴 등의 폐합병증은 피폭 폐용적, 방사선량율, 방사선량 등의 영향을 받으며 그 중에서도 피폭 폐용적의 정도가 중요한 것으로 알려져 있다. 그러나 피폭 폐용적의 정량적인 측정 자료는 매우 드물며 피폭 폐용적의 정도를 예측할 수 있는 방법에 대한 보고도 제한적일 뿐만 아니라 대부분이 서양인을 대상으로 한 보고이다. 이에 본 저자들은 본원에서 치료받은 유방암 환자를 대상으로 접선조사시의 피폭 폐용적을 정량적으로 측정하고 간접적으로 피폭 폐용적을 예측할 수 있다고 제시되고 있는 여러 인자들의 유용성을 검증하고자 본 연구를 계획하였다. 재료 및 방법 :본 원 에 서 1995년 1월 부 터 1996년 8월 까지 접선 조사방식으로 방사선 치료를 시행 받은 유방암환자 중 치료 계획용 컴퓨터 단층 촬영을 시행한 25명을 대상으로 폐용적을 측정하였다 . 각각의 환자에서 피폭 폐용적을 예 측 할 수 있는 인자로서 1) 치료 계획 필름의 조사면 중심에서의 후방 접선으로부터 전방 흉벽의 뒷면까지의 수직선상거리인 Central Lung Distance (CLD), 2) 치료계획 필름의 후방 접선으로부터 전방 흉벽의 뒷면까지의 수직선중 가장 긴 수직선의 거리인 Maximum Lung Distance(MLD), 3) 치료 계획용 컴퓨터 단층 촬영 필름의 조사면 중심사진에서의 후방 접선으로부터 전방 흉벽의 뒷면까지의 거리인 Greatest Perpendicular Distance (GPD), 4) 치료계획 필름 상의 조사면의 세로길이(L)를 측정하였고 피폭 폐용적을 구하기 위하여 치료 계획상의 Dose Volume Histogram(DVH) 자료에서 양측 전체 폐용적(EV), 동측 전체 폐용적(IV) 및 피폭 폐용적(RV)을 측정하고, 서로간의 상관관계를 분석하였다. 결 과 : 총 25명 대상 환자의 연령은 23-67세로(중앙 연령 41세) 우측 유방암이 14예, 좌측 유방암이 11예 있었다. 전체 환자의 CLD는 평균 2.2cm(1.9-3.3cm), MLD는 평균 2.4cm(1.9-3.3 cm) 그리고 GPD는 평균 2.3cm(1.4-3.1cm)이었으며 L은 16-23cm이었다. CLD 와 L을 곱한 값은 평균 42.4cm2(32-76cm2), MLD와 L의 곱은 평균 45.3cm2(34.2 -75.9cm2)였으며, GPD와 L을 곱한 값은 42.5cm2(26.6-69cm2)였다. 전체 폐용적은 1356-4092cc로 평균 3052cc였으며 우측 폐는 584-2554cc 평균 1671cc였고 좌측 폐는 632-2252 cc로 평균 1379cc였다. 피폭 폐용적은 61-279cc(평균 170cc)로 양측 전체 폐용적에서 차지하는 비율은 (RV/EV)은 2.9-13%(평균 5.8%) 이고 동측 폐용적에서 차지하는 비율은(RV/IV) 4.9-29.6(평균 12.2%)였다. CLD, MLD, GPD, L, CLD*L, MLD*L, GPD*L 등의 변화에 따른 RV, RV/EV, RV/IV 등의 피폭 폐용적의 변화는 통계적으로 유의한 상관관계를 구할 수 없었으며 CLD가 3cm 이하인 24명의 환자에서 RV/EV는 10% 이내였다. 좌우 폐의 비교에서 RV/IV 이 좌측 유방암 환자에서 유의하게 높았으나 RV/EV은 유의한 차이를 나타내지 못하였다. 결 론 : 현재 사용하고 있는 접선 조사방식에서 CLD를 3cm 이내로 제한하는 경우 CLD 등의 변화폭이 작아서 피폭 폐용적과의 상관관계를 구할 수는 없으나 피폭 폐용적의 정도는 다른보고들을 고려할때 적절하였고 좌측 유방암 환자에서의 피폭 폐용적이 동측 전체 폐용적에서 차지하는 비율은 우측 유방암 환자에 비해 높았으나 양측 전체 폐용적에 대한 비율은 동일하였다. Purpose : Radiation pneumonitis is one of the complications caused by radiation therapy that includes a portion of the lung tissue. The severity of radiation induced pulmonary dysfunction depends on the irradiated lung volume, total dose, dose rate and underlying pulmonary function. It also depends on whether chemotherapy is done or not. The irradiated lung volume is the most important factor to predict the pulmonary dysfunction in breast cancer patients following radiation therapy. There are some data that show the irradiated lung volume measured from CT scans as a part of treatment planning with the tangential beams. But such data have not been reported in Korea. We planned to evaluate the irradiated lung volume quantitatively using CT scans for the breast tangential field and search for useful factors that could predict the irradiated lung volume. Materials and Methods : The lung volume was measured for 25 patients with breast cancer irradiated with tangential field from Jan.1995 to Aug.1996. Parameters that can predict the irradiated lung volume included; (1) the perpendicular distance from the posterior tangential edge to the posterior part of the anterior chest wall at the center of the field (CLD); (2) the maximum perpendicular distance from the posterior tangential field edge to the posterior part of the anterior chest wall (MLD); (3) the greatest perpendicular distance from the posterior tangential edge to the posterior part of anterior chest wall on CT image at the center of the longitudinal field (GPD); (4) the length of the longitudinal field (L). The irradiated lung volume(RV), the entire both lung volume(EV) and the ipsilateral lung volume(IV) were measured using dose volume histogram. The relationship between the irradiated lung volume and predictors was evaluated by regression analysis. Results : The RV is 61-279cc (mean 170cc), the RV/EV is 2.9-13.0% (mean 5.8%) and the RV/IV is 4.9-29.6% (mean 12.2%). The CLD, the MLD and the GPD are 1.9-3.3cm, 1.9-3.3cm and 1.4-3.1cm respectively. The significant relations between the irradiated lung volume such as RV, RV/EV, RV/IV and parameters such as CLD, MLD, GPD, L, CLD×L, MLD×L and GPD×L are not found with little variances in parameters. The RV/IV of the left breast irradiation is significantly larger than that of the right but the RV/EV s do not show the differences. There is no symptomatic radiation pneumonitis at least during 6 months follow up. Conclusion : The significant relationship between the irradiated lung volume and predictors is not found with little variation on parameters. The irradiated lung volume in the tangential field is less than 10% of entire lung volume when CLD is less than 3cm. The RV/IV of the left tangential field is larger than that of the right but there was no significant differences in RV/EVs. Symptomatic radiation pneumonitis has not occurred during minimum 6 months follow up.