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      • KCI등재

        Stochastic Lineshape Theory for Multistate, Non-Markovian Frequency Fluctuations

        정연준 대한화학회 2015 Bulletin of the Korean Chemical Society Vol.36 No.3

        A stochastic lineshape theory is formulated for the non-Markovian and multistate frequency modulation model. The frequency of the stochastic oscillator undergoes non-Markovian modulations between multiple states, and the transition processes are described by arbitrary waiting-time distributions. By incorporating stationarity into the stochastic process in a proper way, we calculate the propagator and the relaxation function. It is shown that a stationary distribution among the oscillator states satisfies a generalized detailed balance condition even in the non-Markovian case. We find an exact expression for the lineshape function, which contains the Markovian case as a special limit.

      • KCI우수등재

        근린환경은 노인들의 보행경로와 외부활동에 영향을 미치는가?

        정연준,이경환 대한건축학회 2022 대한건축학회논문집 Vol.38 No.9

        As the world approaches a super-aged society, urban-level responses towards the elderly are being actively carried out in the forms of an Age-Friendly City and a Healthy City. Through several preceding studies, the pedestrian-friendly neighborhood environment affected the health of residents was revealed. This study aims to analyze factors that influence the walking activities of elderly people. The spatial scope was set to Yatap-3-dong in Bundang-gu, Seongnam-si, and the subject was set to 25 elderly people living in that area. The elderly's gait activity data was collected using GPS, and the factors influencing gait activity were derived through expert evaluations, interviews, and observational surveys. The analysis results of 413 of the 600 trips or 68.8% of the elderly were derived from the GPS survey and the trip log survey showed that the elderly had high walking dependence. The average walking distance of the elderly per week was 9,419.0 m, and the average walking time was 248.1 minutes. The comparative analysis results of the space frequently used by the elderly and the control group from expert evaluation revealed that the elderly often used streets and public spaces with high pedestrian safety, connectivity, and was sensually comfortable. In the 28 routes or 6.78% of the walking trips taken by the elderly, not only were detours confirmed, but they walked an additional 285.1 m. An accompanying survey and interview results showed that the elderly considered their safety from vehicles, crime, social activity opportunities, slopes, stairs, and scenery when choosing walking routes. This study was significant in that it laid the foundation for the design of an age-friendly neighborhood environment by empirically analyzing the characteristics of elderly walking activities and deriving walking influence factors. 이 연구의 목적은 노인들의 보행활동에 영향을 미치는 요인을 분석하는 것이다. 연구의 공간적 범위는 분당신도시 야탑3동이며, 이곳에 거주하는 노인 25명의 보행 GPS데이터를 수집하여 전문가평가, 인터뷰 및 동행조사, 관찰조사를 통해 노인들의 보행활동을 분석한 결과 노인들은 보행의존도가 높으며, 보행안전성과 연결성이 높고 감각적으로 편안한 거리, 공공공간을 더 많이 이용하는 것으로 나타났다. 본 연구는 노인들의 보행활동 특성을 실증적으로 분석하고 보행영향요인을 도출하여 고령친화적 근린환경 설계의 기반을 마련했다는 점에서 의의가 있다.

      • KCI등재후보

        갑상선 반측 무형성증 1예

        정연준,김재천,정성후 대한갑상선-내분비외과학회 2003 The Koreran journal of Endocrine Surgery Vol.3 No.2

        Thyroid hemiagenesis is considered to be a rare congenital anomaly, but its incidence is propabley underestimated because the diagnosis is usually incidental. The left lobe is absent four times as often as the right and women are about three times more likely to have this developmental defect. Many of these patients are hyperthyroid or medical attention. We present the case of a 14-year-old women with right thyroid hemiagenesis associated without other thyroid disorders. The diagnosis of hemiagenesis was established by isotope imaging and thyroid ultrasound. In most of the clinical reports on thyroid hemiagenesis, an association with other thyroid disorders was found such as hyperthyroidism, multinodular goitre, hypothyroidism, benign adenama, Graves' disease, acute and subacute thyroiditis, and carcinoma. Even if morphology and function of thyroid gland is normal on diagnosis, a follow-up survey should be recommended. (Korean J Endocrine Surg 2003;3:183-185)

      • 소아에서 복부둔상 후 발견된 특발성 소장 궤양의 천공 1예

        정연준,유희철,김재천,Jeong, Yeon-Jun,Yu, Hee-Chul,Kim, Jae-Chun 대한소아외과학회 1999 소아외과 Vol.5 No.2

        Idiopathic small bowel ulceration distal to the duodenum is rare. Less than 5 % of the reported cases were in children. In the majority of the patients, a single ulcer of unknown cause is found in the jejunum or ileum. The diagnosis is difficult and usually made at the time of surgical exploration for complications, such as perforation, hemorrhage or obstruction. We treated a pediatric patient with perforation of an idiopathic ileal ulceration. The child was an 11-year-old boy who sustained blunt abdominal trauma. The involved ileal segment was resected. Pathologic findings were compatible with idiopathic small bowel ulceration. The clinical and pathological aspects of idiopathic ulcerations are discussed, and the literature reviewed.

      • KCI등재
      • KCI등재

        중학교 수학 학습격차 분석 -2016~2020학년도 학교 성적 공시 자료를 기반으로

        정연준,한천우,오택근 한국교육과정평가원 2022 교육과정평가연구 Vol.25 No.3

        본 연구는 우리나라 학생들의 중학교 내신 성적을 이용하여 수학 학습격차의 실태를 분석하고 이를 통해 학습격차를 해소하기 위한 방안을 모색하고자 한다. 이를 위해 전국 중학교의 2016~2020학년 도 성적 공시자료를 분석하여 학생들의 2학년 2학기와 3학년 2학기 수학 성적의 표준편차의 증감을 분석하였다. 분석 결과 3학년 2학기 수학 성적의 표준편차가 2학년 2학기의 표준편차보다 일관되게 2 점 이상 증가하여 왔으며, 특히 COVID-19로 인해 대면 수업이 축소된 2020학년도에 표준 편차의 증 가 폭이 4점 이상으로 두드러지게 확대되었다는 사실을 확인할 수 있었다. 이러한 학습격차의 확대는 수학 저성취 집단의 고착화 및 확대 현상을 동반한다. 중학교에서 학년급이 올라가면서 저성취층에 새 롭게 편입되는 학생이 존재하는 것으로 분석된다. 이러한 분석 결과를 고려할 때 수학 학습격차 해소 를 위해서는 수학 저성취 집단의 고착화 및 확대 현상에 적극적으로 대응할 필요가 있다. 예를 들어, 장 기간 저성취층 집단에 편입되어 저성취 상태에 고착된 학생들을 위한 대응 방안이 필요하며, 저성취층 편입 기간이 길지 않은 학생들을 대상으로 하는 저성취층 고착화 예방 방안 , 저성취층 편입 위험 계층 을 대상으로 하는 저성취층 확대 예방 방안 등이 필요하다. 이러한 논의는 수학 학습격차 해소를 위해 서는 수학 저성취 집단을 동일한 집단으로 간주해서는 안되며, 이 학생들의 저성취 집단 편입 시기 및 편입 가능성을 고려하여 개별 혹은 집단별 맞춤형 지원 방안을 제공해야 한다는 시사점을 제공한다. This study is to explore the patterns of learning gap in math and provide a suggestion to resolve the problem for middle school students. The research adopted the view that the learning gap caused by differences in student individual competencies and family environments affects later learning, which can further deepen the learning gap. To do so, middle school grade disclosure data across the country from 2016 to 2020 were analyzed to figure out increases or decreases in standard deviation of students' math grades from the second grade to third grade by achievement grade. As a result, it was found that the standard deviation of mathematical grades in the third grade has increased by more than 2 points compared to the standard deviation in the second grade. In particular, it was shown that the increase in standard deviation was remarkably expanded to more than 4 points in the 2020 school year, when face-to-face classes were reduced due to COVID-19. The increasing pattern of standard deviation in math represents that the low achievement group in math becomes permanent. As the middle students’ grade gets higher, particularity, students in the middle-achieving class are likely to transfer to the low-achieving class. With the results, it was suggested that all students in the low-achieving class should not be considered in the same way, rather individualized support and/or program should be considered and provided in the math education to reduce learning gap in math education.

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