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우리나라 청정지역에서 측정한 PM_(2.5) 입자의 특성
이종훈,김용표,문길주,김희강,정용승,이종범 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
Atmospheric fine particles (PM_(2.5)) were collected at the background sites, Kangwha, Taean, and Kosan and characterized to understand their behaviors at the sites. Daily samples of PM_(2.5) mass were measured and ionic species, carbonaceous species, and gaseous species were analyzed. Four-daγ backward trajectory analysis was also carried out. The mean concentrations of anthropogenic species were highest at Kangwha among three sites, while contributions from sea salts were highest at Taean during the measurement period due to higher wind speed at Taean. Major chemical components in fine particles were sulfates organic carbon, nitrate, and ammonium. Most of the non-sea-salt (nss) sulfates in PM_(2.5) might be present as ammonium sulfates at these sites. Most air parcels arriving at Kangwha and Taean were from northern China. Therefore, both sites were thought to be affected by the same air parcel. At Kosan, during the measurement period, air parcels were from either northern China or southern China. The nss sulfate concentration in the air parcels from southern China was higher, while the nss calcium nitrate, and ammonium concentrations were higher when the air parcels were from northern China.
우리 나라 배경농도지역의 1996~1997년 미세입자상 탄소성분 측정 결과
김용표,이종훈,문길주,김희강,이종범 江原大學校 附設 環境硏究所 1999 環境硏究 Vol.16 No.-
The concentrations of organic carbon (OC) and elemental carbon (EC) in fine aerosols were determined from the samples collected at the two background sites of Kosan in Cheju Island and Kangwha. Samplings were carried out during the spring and winter of 1996 and the fall and winter of 1997. PM_(2.5) particles were collected on the pre-fired quartz filters for 24 hours and analyzed by the selective thermal oxidation method. The concentrations of OC at the sites were higher than those commonly observed from clean areas around the world, but those of EC at both sites were lower than, or comparable to, other clean areas in the world. Both the OC and EC levels at Kangwha were higher than those at Kosan. According to backward trajectory analysis, most air pollutants collected at thetwo sites were from China. It was found that the OC and EC concentrations in air masses from southern China were higher than those from northern China.
Intensity of Social Network Use by Involvement : A Study of Young Chinese Users
Choo-Hui Park,Yong June Kim 성균관대학교 현대중국연구소 2013 성균관대학교 현대중국연구소 국제학술회의 Vol.- No.19
This research focuses on the use of social network sites (SNS) among young Chinese users. There are two objectives of this study. First, the paper examines the characteristics and current situations of SNS in China. The second is to examine the relationship between the types of involvement and the intensity of SNS use. This study uses data from 200 samples, mostly young Chinese users in Beijing, China. Factor analysis suggests four factors: personal involvement in usefulness and usage, physical involvement in trust, and situational involvement in relationships. The total variance explained by all four factors is 67.82 percent. Personal involvement on usefulness accounts for most (33.12%) of the explained variance, followed by physical involvement in trust(13.47%). In general, correlation results show that there are significant relationships between the intensity to use SNS and all types of involvement. Personal involvement in usefulness shows a very strong relationship with the intensity of SNS use(cor=.93).Through regression, the result suggests that only personal involvement in usefulness and physical involvement in trust are in the model, with a value of 88.5 percent for R², which significantly explains the intensity of SNS use. The results from this study provide insightful information on how different types of involvement can influence users' intensity of SNS use. The mostly frequently used social network sites among participants for this study are Renren, QQ(Qzone) and Sina Space.
Social Network Use by Involvement among Chinese Young Users
Choo-Hui Park,Yong June Kim 성균관대학교 현대중국연구소 2014 성균관대학교 현대중국연구소 국제학술회의 Vol.- No.20
This research focuses on the use of social network sites (SNS) among young Chinese users. There are two objectives of this study. First. the paper examines the characteristics and current situations of SNS in China. The second is to examine the relationship between the types of involvement and the intensity of SNS use. This study uses data from 200 samples, mostly young Chinese users in Beijing, China. Factor analysis suggests four factors: personal involvement in usefulness and usage, physical involvement in trust, and situational involvement in relationships. The total variance explained by all four factors is 67.82 percent. Personal involvement on usefulness accounts for most (33.12%) of the explained variance, followed by physical involvement 111 trust (13.47%). In general, correlation results show that there are significant relationships between the intensity to use SNS and all types of involvement. Personal involvement in usefulness shows a very strong relationship with the intensity of SNS use(cor=.93). Through regression, the result suggests that only personal involvement in usefulness and physical involvement in trust are in the model, with a value of 88.5 percent for R2, which significantly explains the intensity of SNS use. The results from this study provide insightf비 information on how different types of involvement can mfluence users' intensity of SNS use. The mostly frequently used social network sites among participants for this study are Renren, QQ(Qzone) and Sina Space.
양희규 ( Hui-gui Yang ),염상길 ( Sanggil Yeoum ),추현승 ( Hyun-seung Choo ) 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.1
제안 시스템은 모바일 사용자를 공공 인터넷 환경에서 사용 유형별로 분류 및 관리 가능한 서비스를 제공한다. 비콘을 이용하여 시스템 사용자의 위치와 서비스공간의 근접성을 확인한다. 또한 사용자의 서비스 사용 형태 및 성향에 따라 서비스 제공 장소에서 네트워크에 연결된 사물 인터넷 기기 및 기타 기기에 대한 접근 권한을 미리 정의하고 이를 제공할 수 있다. 본 연구는 이러한 시스템을 제안하고 구현된 결과를 바탕으로 시스템의 기능을 분석한다.
Korean Version of Mini Mental Status Examination for Dementia Screening and Its Short Form
Tae Hui Kim,주진형,박준혁,김정란,Seung Ho Ryu,문석우,Il Han Choo,Dong Woo Lee,윤종철,Yeon Ja Do,이석범,김문두,김기웅 대한신경정신의학회 2010 PSYCHIATRY INVESTIGATION Vol.7 No.2
ObjectiveaaWe developed a Korean version of Mini-Mental Status Examination (MMSE)optimized for screening dementia (MMSE-DS) and its short form (SMMSE-DS). MethodsaaWe constructed the MMSE-DS using the items of the two current Korean versions of MMSE and then construct the SMMSE-DS consisted of 13 items from the MMSEDS based on the diagnostic accuracy of individual items for dementia. We investigated reliability and validity of MMSE-DS and SMMSE-DS on 1,555 subjects (1,222 nondemented controls,333 dementia patients). We compared the diagnostic accuracy of the SMMSE-DS with that of the three full Korean versions of MMSE, and examined its age- and education-specific optimal cutoff scores for dementia. ResultsaaThe internal consistency obtained by Cronbach’s coefficient alpha was 0.826. The inter-rater reliability and test-retest reliability were 0.968 (p<0.001) and 0.825 (p<0.001), respectively. It showed significant correlation with the Clinical Dementia Rating (CDR) (r=-0.698,p<0.05) and the three full Korean versions of MMSE (r=0.839-0.938, p<0.001). The area under the receiver operator curve for dementia of the SMMSE-DS was larger than those of the three full Korean versions of MMSE (p<0.001). Age, education and gender explained 19.4%of the total variance of SMMSE-DS scores. The optimal cutoff scores for dementia of the SMMSE-DS were estimated differently by age and educational attainment of the subjects. ConclusionaaThe SMMSE-DS was found to be accurate, brief and portable instrument for screening dementia in Korean elders, and may be particularly useful for screening dementia in elderly populations with wide variation in educational levels.
이태훈,Choo Jeong Min,김정섭,Shin Seon Hui,김지선,백세진,곽정면,김진,김선한 대한대장항문학회 2022 Annals of Coloproctolgy Vol.38 No.3
Purpose: Colorectal cancer (CRC) occurs in all age groups, and the application of treatment may vary according to age. The study was designed to identify the characteristics of CRC by age. Methods: A total of 4,326 patients undergoing primary resection for CRC from September 2006 to July 2019 were reviewed. Patient and tumor characteristics, operative and postoperative data, and oncologic outcome were compared Results: Patients aged 60 to 69 years comprised the largest age group (29.7%), followed by those aged 50 to 59 and 70 to 79 (24.5% and 23.9%, respectively). Rectal cancer was common in all age groups, but right-sided colon cancer tended to be more frequent in older patients. In very elderly patients, there were significant numbers of emergency surgeries, and the frequencies of open surgery and permanent stoma were greater. In contrast, total abdominal colectomy or total proctocolectomy was performed frequently in patients in their teens and twenties. The elderly patients showed more advanced tumor stages and postoperative ileus. The incidence of adjuvant treatment was low in elderly patients, who also had shorter follow-up periods. Overall survival was reduced in older patients with stages 0 to 3 CRC (P<0.001), but disease-free survival did not differ by age (P=0.391). Conclusion: CRC screening at an earlier age than is currently undertaken may be necessary in Korea. In addition, improved surgical and oncological outcomes can be achieved through active treatment of the growing number of elderly CRC patients.