• 천문학회보
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• 제36권1호
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• pp.39.1-39.1
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• 2011

Coronal mass ejection (CME) plasmas have been observed in EUV and X-ray passbands as well as in white light. Mass of CME has been determined using polarized brightness observed by the Large Angle and Spectrometric Coronagraph Experiment (LASCO) on board Solar and Heliospheric Observatory (SOHO). Therefore, this mass obtained from the LASCO observation indicates the total CME mass. However, the mass of CME plasma in different temperatures can be determined in EUV and X-ray passbands using observations by SOHO/EIT, STEREO/EUVI, and Hinode/XRT. Prominence/CME plasmas have been observed as absorption or emission features in EUV and X-ray passbands. The absorption features provide a lower limit to cold mass. In addition, the emission features provide an upper limit to the mass of plasmas in temperature ranges of EUV and X-ray. We determine the mass constraints using the emission measure obtained by assuming the prominence/CME structures. This work will address the mass constraints of hot and cold plasmas in CMEs, comparing to total CME mass.

• 한국초등과학교육학회지:초등과학교육
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• 제17권1호
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• pp.23-32
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• 1998

A good example of the persistence of naive theories about change in seasons is well knowned: A filmmaker carried a camera into the crowd of gowned graduates at the 1987 commencement of Harvard University and asked a simple question, that is, "Why is it hotter in summer than in winter?" to twenty five students chosen at random. All of the answers except two were that the Earth is closer to the Sun in summer, so it is hotter in summer, but the Earth is farther from the Sun in winter, so it is cooler in winter. Until now, naive theories about the cause in seasons have been extensively studied. However, few studies to overcome these naive theories were reported. Author takes two steps: first, a new model on the cause in seasons is developed. Second, preservice students concepts' change on the cause in seasons through the new model is observed. The author concludes that the new model have a good effect on the preservice students concepts' change on the cause in seasons.

• 천문학회보
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• 제45권1호
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• pp.35.3-36
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• 2020

The Time Domain Field is one of the future GTO program fields of JWST(JWST/GTO TDS), surveying about 14' diameter field at the North Eliptical Pole(NEP) with NIRCam/NIRISS. As a part of the multi-wavelength study of the field, we have obtained SCUBA-2 850㎛ mapping which reaches a depth of σrms = 0.9mJy/beam and detect 93 sources at S/N > 3.5 ― which are expected to be highly star-forming (SFR>400M◉/yr) galaxies at z ≳ 1.5-4 and pinpoint the location at <0. " 1 accuracy of 68 sub-mm sources by identifying VLA 3GHz radio counterparts. In this talk, we will introduce the SCUBA-2 JWST/GTO TDS project and the newly discovered sub-mm sources in this field.

• Journal of Chest Surgery
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• 제55권1호
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• pp.77-80
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• 2022

Kartagener syndrome (KS) is a rare disease with an incidence of 1 in 20,000 to 30,000 births. There is no cure for KS, and conservative medical treatments are used to relieve symptoms and prevent disease progression. Lung transplantation (LT) is the only treatment option for end-stage KS. Since patients with KS have anatomical abnormalities such as situs inversus totalis, which often require surgery to correct, most reports are related to surgical techniques. Reports about morphological adaptations and changes in transplanted lung structure after LT in patients with KS are rare. We performed LT in a patient with KS and observed morphological adaptation of the lungs for 6 months on chest computed tomography using a quantitative evaluation tool (Chest Image Platform; Harvard University Disability Resources, Cambridge, MA, USA).

• 한국광과학회:학술대회논문집
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• 한국광과학회 2005년도 제12회 학술대회 논문초록
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• pp.42-42
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• 2005

• Safety and Health at Work
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• 제14권3호
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• pp.340-346
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• 2023

Background: Truck driving is a highly sedentary occupation that places workers at risk for chronic health conditions, such as obesity and high blood pressure. The primary purpose of this study was to objectively describe truck drivers' typical physical activity (PA) patterns. Methods: We used ~7-10-day baseline PA actigraphy data samples from drivers in the Safety & Health Involvement For Truckers (SHIFT) study (n = 394). Driver PA patterns (e.g., average number of ≥10 minute Freedson bouts per week, time in bouts, and common days/times for PA) were summarized with descriptive analyses. We also compared objective accelerometer data to self-reports. Results: Drivers' weekly PA averaged 14.4 minutes (SD = 37.0), and most PA occurred between 5-6 pm on Tuesdays and Wednesdays. Drivers overestimated self-reported weekly exercise by over 60 min/week compared to accelerometer data. Conclusion: Our results suggest that objective PA assessment may be warranted over self-report when possible, and timing may be key in future PA intervention work with truck drivers.

• 대한본초학회지
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• 제21권2호
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• pp.159-163
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• 2006

Objectives : The subacute toxicity was investigated in Sprague-Dawley rats orally treated with Dangguibohyel-tang (DBT). DBT has been used for anemia, in Korean medicine. Methods : Sprague-Dawley rats were administered orally with DBT at the dosages of 1,000 mg/kg for 14 days. We daily examined number of deaths, clinical signs, body weights and gross findings during the 14 days. Results : There were no clinical signs and pathological changes compared with control group. Body weights were not significantly changed between control and treatment groups. In hematological and biochemical serum parameters, all mean values appear to be within the normal range. Conclusion : These results suggest that DBT dose not induce any significant subacute oral toxicities in Sprague-Dawley rats.

• Bulletin of the Korean Chemical Society
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• 제25권12호
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• pp.1791-1800
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• 2004

Angiotensin I, a model decapeptide, was glycosylated and partially hydrolyzed with HCl (6 N, 80 $^{\circ}C$, 4 h), aminopeptidase, and carboxypeptidase Y. A single peptide mass map obtained from truncated peptides in the partial acid hydrolysate of angiotensin and its glycosylation product mixture by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry enabled sequencing of angiotensin by a combinatorial procedure. MALDI-TOF and electrospray ionization (ESI) tandem mass spectrometric results indicate that both the N-terminal amino group of aspartic acid and the guanidinium group of the second residue arginine are glycosylated.

• Journal of Information Processing Systems
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• 제18권3호
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• pp.302-310
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• 2022

Efficient use of limited blood products is becoming very important in terms of socioeconomic status and patient recovery. To predict the appropriateness of patient-specific transfusions for the intensive care unit (ICU) patients who require real-time monitoring, we evaluated a model to predict the possibility of transfusion dynamically by using the Medical Information Mart for Intensive Care III (MIMIC-III), an ICU admission record at Harvard Medical School. In this study, we developed an explainable machine learning to predict the possibility of red blood cell transfusion for major medical diseases in the ICU. Target disease groups that received packed red blood cell transfusions at high frequency were selected and 16,222 patients were finally extracted. The prediction model achieved an area under the ROC curve of 0.9070 and an F1-score of 0.8166 (LightGBM). To explain the performance of the machine learning model, feature importance analysis and a partial dependence plot were used. The results of our study can be used as basic data for recommendations related to the adequacy of blood transfusions and are expected to ultimately contribute to the recovery of patients and prevention of excessive consumption of blood products.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제23권4호
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• pp.977-998
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• 2009

초등(elementary), 중등(secondary)교육에 이어지는 대학 및 직업 교육을 총칭하여 고등(tertiary) 교육이라고 한다. 본 연구는 미국에서의 고등(tertiary)수학과 한국에서의 고등수학 초기 발전과정을 비교 연구한다. 미국 대학에서의 수학 강좌개설의 역사를 살펴보면 하버드대 학장인 던스터가 1640년 산술과 기하를 예비졸업생들을 대상으로 지도한 기록이 남아있다[10]. 이 기록에 의하면 미국 대학과정의 수학은 1636년 설립된 하버드 대학에서 1640년부터 실질적인 강의가 시작되었다고 할 수 있다. 미국의 수학자로는 1870년 'Linear Associative Algebra'를 발간한 하버드의 벤자민 퍼스가 비로소 수학에 대한 학술적인 기여를 통하여 처음으로 유럽학계의 주목을 받는다. 미국의 경우 세 번째 연구중심대학으로 시작한 시카고대학의 성장과 함께 학술적으로 유럽 수학계의 인정을 받고 미국 수학연구의 존재를 학계에 알린 미국인 수학자로 G.D. 버코프를 꼽는다. 1912년 하버드대 수학과 교수로 부임하여 하버드대 수학과의 역할을 교육에서 연구로 바꾸는데 결정적인 역할을 한다. 즉, 미국 수학이 교육에서 연구 단계로 진화하는 과정에 무려 200년 이상이 걸렸다는 사실을 확인할 수 있다. 하버드에서 대학 과정이 설립될 즈음 조선에서의 고등수학의 상황은 어떠하였을까? 한반도에서는 조선산학과 구한말의 대학부 및 연희 전문학교 수물과를 거쳐 1945년 8월 2차 세계대전이 끝나면서 비로소 일제식민통치하에서 벗어난 1945년 4년제 대학에 수학과가 처음 설립된다. 일제 강점기에는 중학교와 전문학교 이과에서 일부 직업교육 또는 대학수학이 다루어졌다. 한국의 경우 경성대의 이임학이 1947년 막스 존의 미해결 문제를 풀며 한국 근대수학자의 존재를 서양에 알리게 된다. 본 연구에서는 미국과 한국의 초기 고등수학 발전과정을 수학자 중심으로 비교 연구하여 발전 단계를 진단한다.