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박완일 ( Wan-il Park ) 전북대학교 과학교육연구소 2017 과학과 과학교육 논문지 Vol.42 No.2
현대우주론의 초석들 중 하나인 원시-가속팽창(primordial inflation) 가설에 대한 소개로서, 가속팽창 가설의 (ㄱ) 핵심적 착상과 동작원리 및 이론적 구현의 예를 살펴보고, (ㄴ) 관측자료로부터 어떻게 이론들을 구별해 내는지, 그리고 (ㄷ) 쟁점들은 어떤 것들이 있는 지를 간력하게 살펴본다. As an introduction to the hypothesis of primordial inflation, a cornerstone of modern cosmology, we briefly describe (a) the key idea, how it works, and an example of theoretical realization, (b) how to discriminate different models by observations, and (c ) issues.
박완일 ( Wan-il Park ) 전북대학교 과학교육연구소 2020 과학과 과학교육 논문지 Vol.45 No.2
우리우주에서 물질의 대략 85%를 차지하고 있는 것으로 알려진 ‘암흑물질’에 대해 간략히 소개한다. We introduce briefly dark matter which is known to be occupying about 85% of matter in the universe.
김건우 ( Geonwoo Kim ),김재윤 ( Jaeyun Kim ),김찬우 ( Chanwoo Kim ),윤창빈 ( Changbin Yoon ),최지호 ( Jiho Choi ),윤희철 ( Heecheol Yoon ),박완일 ( Wan-il Park ) 전북대학교 과학교육연구소 2019 과학과 과학교육 논문지 Vol.44 No.2
만유인력 법칙의 구조를 이론적으로 이해하고, 거리-역제곱법칙을 실험으로 검증해 보았다. 이론적으로는, 만유인력 법칙의 수학적 구조를 뉴턴의 제 2 운동법칙을 통해 추론해 보고 뉴턴이 했던 것과 같이 달의 공전을 이용하여 거리의 역제곱 법칙이 성립함을 확인해 보았다. 실험적으로는, 정밀저울을 이용하여 일정한 질량을 가진 분동의 높이 변화에 따른 무게변화를 측정함으로써 중력가속도의 크기 변화를 측정하고, 이로부터 만유인력의 법칙이 가진 거리-역제곱 법칙을 실험적으로 검증해 보았다. We inspected the theoretical structure of the law of universal gravity, and verified it experimentally. Theoretically, we deduced the mathematical structure of the law of universal gravity from Newton’s second law of motion, and confirmed the law of inverse square-distance via moon’s orbital motion as Newton did. Experimentally, in order to verify the law of inverse square-distance, a characteristic of the law of universal gravity, using a precision scale, we measured the variation of the magnitude of the gravitational acceleration as a function of the hight from the ground by measuring the weight of a weight having a given mass.
원발성 간외 담관암의 임상적 고찰 : 예후 인자 분석을 중심으로
김성호,박완,이정희,김명환,이성구,민영일,주광로,방성조,주연호,명승재,공경엽,김해경,이철룡 대한소화기학회 1999 대한소화기학회지 Vol.33 No.1
Background/Aims: The prognosis of extrahepatic bile duct carcinoma is very poor. The value of the gross morphology and location of the tumor in the bile duct as prognostic factors have been contro versial. Thus, we conducted a retrospective analysis of the prognostic factors. Methods: During the period between June, 1989 and December, 1996, 193 cases of extrahepatic bile duct carcinomas were selected and 108 cases of them were curatively resected. We collected data at the point of August 1997. Results: The mean age was 61.9 (17-87) years and the male to temale ratio was 2.5:1. Th frequency of tumor according to the location was 32.1% in the upper part, 31.6% in the middle par and 5.3% in diffuse type. The overall 1,2,3, and 5-year survival rate was 49.9%, 32.2%, 23.4%, and 17.8%, respectively. In the patients with curative surgery (n=108), the 1-, 2-, 3-, and 5- year surviva rate was 70.0%, 48.0%, 37.1% and 27.2%, respectively. In the patients without carative surgery (n=85), the 1-, 2-, 3-, and 5-year survival rate was 24.0%, 12.5%, 7.1%, and 3.0%, respectively. The survival rates of stage I were significantly better than those of stage II, stage III and stage IV-A. Th survival rates of well differentiated histology were significantly better than those of moderate or poo differentiation. Conclusions: The stage, histologic differentiation and curative resectability of the extrahepatic bile duct carcinoma were significant prognostic factors. However, the gross morphology and location of the tumor had no prognostic significance. (Kor J Gastroenterol 1999;33:114 - 123)