기획 : 올바른 음악교육을 위하여

정정연,이윤경 민족음악연구회 1990 민족음악 Vol.1 No.-

펌프광 세기 및 온도에 대한 85Rb과 87Rb 닫힌 전이선의 편광분광신호 의존성 비교

정정연,이상록,문걸 한국물리학회 2020 새물리 Vol.70 No.7

We investigate the dependence of the polarization spectroscopy signal on the pump beam intensity and the vapor cell temperature around the Fg = 3 ! Fe = 4 closed transition line of 85Rb and the Fg = 2 ! Fe = 3 closed transition line of 87Rb, and we analyze the amplitudes of those signals. We observe that the temperature dependences of the polarization spectroscopy signal around the closed transition lines of 85Rb and 87Rb shows different tendencies, and that the temperature dependence of the polarization spectroscopy signal on the pump beam intensity. Interestingly the different temperature dependence of two isotopes comes from the difference in energy spacing between its hyperfine structure energy levels. It was theoretically confirmed that the signal amplitude of the closed transition line is affected by overlapping with the cross-over signal due to the increase in line width of the cross-over spectral signal depending on the temperature dependence. 85Rb과 87Rb의 각각의 D2 전이선 중 Fg = 3 ! Fe = 4와 Fg = 2 ! Fe = 3 닫힌 전이선 근처에서의펌프빔의 세기와 증기셀 온도에 대한 편광분광신호 의존성을 연구하였고, 이 편광분광신호의 진폭변화를분석하였다. 85Rb원자와 87Rb원자에 대한 닫힌 전이선 근처에서의 편광 분광신호의 온도 의존성이 서로다른 경향성을 보여주는 것을 관측하였고, 또한 펌프빔 세기에 대한 편광분광신호의 변화 경향성에도영향을 주는 것을 관측하였다. 흥미롭게도 두 동위 원소의 온도에 따른 의존성 차이는 초미세구조 에너지준위들 간의 에너지 간격의 차이로 인해 발생한다. 즉, 닫힌 전이선 바로 옆에 있는 cross-over 분광신호의온도 의존성에 따른 선폭의 증가로 인해 닫힌 전이선의 신호와 겹치게 되어 진폭에 영향을 주는 것을이론적으로 확인하였다.

연구발표초록 ( 촉매 및 반응공학 ) : 메탄올과 아세트산으로부터 아크릴산 제조용 촉매 연구

정정연 (정),장우상 (정),전기원 (정),최명재 (정) ( J . Y . Jung,W . S . Chang,K . W . Jun,M . J . Choi ) 한국화학공학회 1990 춘계학술발표회 Vol.- No.-

정서 및 행동문제를 가진 아동과 청소년의 사회적 기술 중재에 대한 고찰

허수연 ( Su Yeon Heo ),강수연 ( Su Yeon Kang ),정정은 ( Jung Eun Jung ),박지연 ( Ji Yeon Park ) 한국정서.행동장애아교육학회(구.한국정서학습장애아교육학회) 2010 정서ㆍ행동장애연구 Vol.26 No.4

본 연구는 정서 및 행동문제를 가진 학생들을 대상으로 실시한 사회적 기술 중재의 연구 동향을 분석함으로써 사회적 기술 교육의 적용 방안과 추후 연구의 방향을 모색하고자 실시되었다. 이를 위하여 2000년부터 2010년까지 국내외 학술지에 게재된 21편의 연구를 선정하고 연구 참여자, 연구 설계, 독립변인, 종속변인, 연구결과, 사회적 타당도 등의 범주에 따라 분석을 실시하였다. 연구 결과를 토대로 사회적 기술 중재의 연구 동향 및 제한점을 논의하고, 사회적 기술 진단, 연구 설계, 중재 프로그램 개발 등의 측면과 관련하여 후속 연구에서 유의해야 할 사항을 제언하였다. The purpose of this study is to analyze the studies on social skill intervention for children and adolescents with emotional and behavioral difficulties in order to present implications for practices and future research. A total of 21 articles published between 2000 and 2010 were selected. The analyses were conducted in terms of intervention participants, research design, independent variable, dependent variables, research results, and social validity. Based on the results, trends and limitations of social skill intervention studies were discussed and considerations for future studies were suggested.

생물적 제어 수단으로서 녹비작물의 Allelochemical 특성 분석

정정아,성좌경,이상민,이 연,김태완,송범헌 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04

국내 유기농업 재배지에서 주로 이용되는 녹비작물의 Allelochemical 특성을 조사하여 생물적 제어 수단으로 서의 실용화 가능성을 구명하고자 본 연구를 수행하였다. 토양 이화학적 특성은 시험 후 녹비 처리된 토양의 총 질소함량이 증가하는 경향을 보였다. 토양 무기태질소의 함량은 무피복구, 헤어리베치처리구 및 헤어리베 치+호밀 처리구는 비료 시비 및 녹비환원과 동시에 증가하기 시작하여 녹비환원 후 30일 경에 최대에 도달하 였으며, 헤어리베치의 투입량이 많을수록 무기화되는 질소의 양이 많아졌다. 토양 탄수화물은 시험 전에 가장 높았으며, 시간의 경과와 함께 서서히 감소되는 양상을 보였다. 토양 미생물탄소 및 미생물질소의 양은 조사 기간 동안 녹비환원구가 무피복구에 비해 높았다. 토양 총 페놀화합물은 헤어리베치, 호밀, 헤어리베치+호밀 (1:1)은 환원 후 10일에 최대로 증가하였고, 헤어리베치+호밀(1:3, 3:1)은 환원 후 30일에 최대로 증가하였다. 토양 부식산은 무피복구와 녹비 처리구에서 처리 전에 비하여 처리 후에 약간 증가하는 경향을 보여 녹비 작물 환원에 의한 부식산 증가효과는 미비한 것으로 나타났다. 녹비환원 후 85일에 잡초발생량은 광엽초종의 경우 헤어리베치+호밀(1:3)>헤어리베치>호밀>헤어리베치(1:1)>헤어리베치(3:1)>무피복 순이었고, 단자엽초 종은 헤어리베치+호밀(3:1)>무피복>헤어리베치>호밀>헤어리베치+호밀(1:3)>헤어리베치+호밀(1:1)순으로 나 타났다. 녹비작물의 환원은 잡초억제효과가 있는 것으로 나타났다. 잡초에 의한 질소 탈취율의 결과 무피복구 는 65.9kg/ha의 질소를 잡초가 탈취하였으나, 녹비환원구는 무피복구의 50%미만으로 나타났다.

한국 성인의 흡연과 치주질환과의 관련성: 2010년 국민건강 영양조사 자료

정정옥 ( Jung Ock Jung ),전주연 ( Ju Yeon Chun ),이경희 ( Kyeong Hee Lee ) 한국치위생학회 2013 한국치위생학회지 Vol.13 No.3

Objectives : The purpose of this study was to evaluate the relationship between smoking and peridontal diseases in Korean adults based on the data from the Korea National Health and Nutrition Examination Survey 2010. Methods : The study subjects were 5,605 adults aged 19 years or older whose information were community periodontal index (CPI) and smoking status. and statistical analyses were conducted by applying complex sample analysis technique. Results : In terms of the relationship between smoking and periodontal status, the risk of periodontitis was 1.63-fold higher in smoker group than in nonsmoker group, and 1.02-fold higher even after adjustment of gender, age, income levels, educational background, alcohol consumption, exercising, body mass index (BMI), oral examination, the frequency of tooth brushing, the use of oral hygiene devices, and perceived oral health. Chi square analysis also showed that the prevalence rate of periodontitis was higher in smoker group than in nonsmoker group. Conclusions : It is very important to provide oral health education by smoking cessation and prevent periodontal diseases through anti-smoking campaign.

저탄소 베이나이트 강재의 벽개파괴거동에 미치는 미세구조인자의 영향 (초)

정정만,강전연,이후철 대한금속ㆍ재료학회 2009 대한금속재료학회 학술대회 개요집 Vol.2009 No.-

Prognostic Influence of Preoperative Fibrinogen to Albumin Ratio for Breast Cancer

황기태,정정기,노은연,김종진,오소희,김영아,류지영,김수지 한국유방암학회 2017 Journal of breast cancer Vol.20 No.3

Purpose: Elevated serum concentration of fibrinogen and decreased serum concentration of albumin have been reported to be markers of elevated systemic inflammation. We attempted to investigate the prognostic influence of preoperative fibrinogen to albumin ratio (FAR) for breast cancer. Methods: Data from 793 consecutive primary breast cancer patients were retrospectively analyzed. Serum levels of fibrinogen and albumin were tested before curative surgery. Subjects were grouped into two groups according to the cutoff value determined by performing the receiver operating characteristic curve analysis: the high FAR group (FAR>7.1) and the low FAR group (FAR≤7.1). Overall survival was assessed using the Kaplan-Meier estimator. Independent prognostic significance was analyzed using the Cox proportional hazards model. Results: The high FAR group had a worse prognosis compared to the low FAR group (log-rank test, p<0.001). The prognostic effect of FAR was more significant than that of single markers such as fibrinogen (log-rank test, p=0.001) or albumin (log-rank test, p=0.001). The prognostic effect of FAR was prominent in the stage II/III subgroup (log-rank test, p<0.001) and luminal A-like subtype (log-rank test, p<0.001). FAR was identified as a significant independent factor on both univariate (hazard ratio [HR], 2.722; 95% confidence interval [CI], 1.659–4.468; p<0.001) and multivariate analysis (HR, 2.622; 95% CI, 1.455–4.724; p=0.001). Conclusion: Preoperative FAR was a strong independent prognostic factor in breast cancer. Its prognostic effect was more prominent in the stage II/III subgroup and in the luminal A-like subtype. Therefore, preoperative FAR can be utilized as a useful prognosticator for breast cancer patients. Further studies are needed to validate its applications in clinical settings.

Mn 및 Cr 주강의 주형반응에 관한 연구

이진호,정정연,이종남 ( J . H . Lee J . Y . Jeong,J . N . Lee ) 한국주조공학회 1985 한국주조공학회지 Vol.5 No.4

In order to investigate the mold reaction characteristics of Mn steel and Cr steel castings individually, the mold reaction products were examined by scanning electron microscopy, electron prove microanalyzer and X-ray diffractometer. From this experiment, the results were summarized as follows: 1) The mold reaction depth increased with increase of Mn content, while it decreased with increase of Cr content. 2) Mold reaction depth decreased with Mn content at 1200℃. 3) Mn, among the reaction products, forms a low fusion silicate, MnO·SiO₂while Cr forms a stable oxide, CrO₃which hindering the reaction between FeO and SiO₂thus the formation of FeO·SiO₂was depressed.

Establishment of a Nationwide Korean Imaging Cohort of Coronavirus Disease 2019

윤순호,함수연,남보다,채금주,이다비,Jin Young Yoo,박소현,김진영,김진환,Kim Ki Beom,정정임,Lim Jae-Kwang,이종은,정명진,이영경,김영선,Jo Ji Eun,이상민,Woocheol Kwon,박창민,김윤현,정연주 대한의학회 2020 Journal of Korean medical science Vol.35 No.46

Background: The Korean Society of Thoracic Radiology (KSTR) recently constructed a nation-wide coronavirus disease 2019 (COVID-19) database and imaging repository, referred to the Korean imaging cohort of COVID-19 (KICC-19) based on the collaborative efforts of its members. The purpose of this study was to provide a summary of the clinico-epidemiological data and imaging data of the KICC-19. Methods: The KSTR members at 17 COVID-19 referral centers retrospectively collected imaging data and clinical information of consecutive patients with reverse transcription polymerase chain reaction-proven COVID-19 in respiratory specimens from February 2020 through May 2020 who underwent diagnostic chest computed tomography (CT) or radiograph in each participating hospital. Results: The cohort consisted of 239 men and 283 women (mean age, 52.3 years; age range, 11–97 years). Of the 522 subjects, 201 (38.5%) had an underlying disease. The most common symptoms were fever (n = 292) and cough (n = 245). The 151 patients (28.9%) had lymphocytopenia, 86 had (16.5%) thrombocytopenia, and 227 patients (43.5%) had an elevated CRP at admission. The 121 (23.4%) needed nasal oxygen therapy or mechanical ventilation (n = 38; 7.3%), and 49 patients (9.4%) were admitted to an intensive care unit. Although most patients had cured, 21 patients (4.0%) died. The 465 (89.1%) subjects underwent a low to standard-dose chest CT scan at least once during hospitalization, resulting in a total of 658 CT scans. The 497 subjects (95.2%) underwent chest radiography at least once during hospitalization, which resulted in a total of 1,475 chest radiographs. Conclusion: The KICC-19 was successfully established and comprised of 658 CT scans and 1,475 chest radiographs of 522 hospitalized Korean COVID-19 patients. The KICC-19 will provide a more comprehensive understanding of the clinical, epidemiological, and radiologic characteristics of patients with COVID-19.