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정병훈,신운식,김경식 中央醫學社 1989 中央醫學 Vol.54 No.5
Since the scapular flap was described by dos Santos and clinically implemented by Alain Gilbert, it has generally been utilized with no functional donor site morbidity. We have experienced sixteen cases involving various parts of the body such as jaw, neck, axilla, upper and lower extremities. Of them fifteen flaps were transfered successfully and one was failed because of recipient's arterial insufficiency. In this paper we presented a series of sixteen treated cases along with recommended methods for dissecting the flap, and an analysis of its advantages and disadvantages with related references.
정병훈,송진웅,박종원,권성기 한국과학교육학회 1998 한국과학교육학회지 Vol.18 No.2
본 연구에서는 이상화의 의미와 특성에 대한 논의를 통해 이상화에 대한 학생과 교사의 이해를 조사하기 위한 이론적 기반을 제공하고자 한다. 갈릴레오에 의해 도입되어 근대물리학의 특성을 규정짓게 한 이상화는 네 가지 방법에 의해 설정된다: 특정 변인을 무시하거나, 변인의 특성을 기술하지 않거나, 극한 상황을 가정하거나, 일정 또는 균일하다고 하는 방법. 이러한 방법을 통해 설정된 이상화는 실제 세계에 대한 감각정보로부터 모델과 법칙을 만들고, 이것을 수식화하고 형식화함으로서 물리 세계를 구축하는 발견의 맥락에서 중요한 역할을 하게 된다. 물리세계가 이상조건의 설정을 통해 구축된다는 관점은 물리 세계가 실제 세계에 대한 근사일 뿐이라는 관점을 갖게 하며, 이러한 관점은 실제에 대한 철학적 문제를 야기시키기도 한다. 또한 물리 세계로부터 실제 세계를 설명하고 이해하는 과정에서도 이상화는 중요한 역할을 하게 된다. 즉, 물리학자들은 물리 세계와 실제 세계와의 격차를 인정하고 그러한 격차를 설명하고 나아가 격차를 좁히기 위한 끝없는 노력을 하게 되는데, 이때 물리학자들은 물리세계에서 설정되었던 이상화를 조정하거나 제거하는 활동을 하게 된다. 본 연구에 뒤이어, 이상화가 물리학습에 주는 시사점에 대한 논의와 실제 학생과 교사의 이상화에 대한 이해조사가 계속될 것이다. This study is the first part of the investigation of the students' and teachers' understanding of ideal conditions in physics. To do this, here, we provided the theoretical basis for the above study by discussing the meaning and characteristics of idealization. Idealization, introduced and elaborated by Galileo therefore characterized the nature of modern science, can be generated by four procedures: neglecting the minor variables, giving without any description about the minor variables, assuming the limit case, assuming constancy or uniformity. Idealization generated by these procedures can produce models and laws from the sensory informations about real world. And physics world is constructed by formalization or mathematization of these models and laws obtained through idealization about real world. Therefore, it can be said that idealization have a major role in the context of discovery. By this aspects, physics world can be viewed as the approximation of the real world, and this view, again, give rise the philosophical debate about the reality in nature. Idealization take an important role in the process of application of physics world and the understanding the real world. That is, physicists accept the discrepancies between real world, and physics world and make a great effort to explain, moreover, reduce these discrepancies by modifying or eliminating idealization involved in physics world. Continued from this study, we will proceed to obtain the implications of idealization on the physics learning and investigate the students' and teachers' understanding of the ideal condition involved in the theoretical explanation and the experiment in physics.
Al-Si 도금된 보론강과 Zn 도금된 DP강의 TWB 레이저 용접부 미세조직과 경도에 미치는 핫 스탬핑 열처리의 영향
정병훈,공종판,강정윤 대한금속·재료학회 2012 대한금속·재료학회지 Vol.50 No.3
In this study, the effect of hot-stamping heat treatment on the microstructure and hardness of TWB(Tailor Welded Blank) laser joints in Al-Si-coated boron steel and Zn-coated DP(Dual Phase)590 steel was investigated. In the TWB joints without heat treatment, hardness profiles showed local hardness deviation near the fusion zone. However, there was no hardness deviation in the heat treated specimen and its hardness was higher than that of the one without the heat treatment, due to a fully martensite microstructure. In the TWB joints of both the boron and DP steels, the maximum hardnesses were observed at the HAZ(Heat Affected Zone) near the base metal, and the hardness decreased gradually to the base metal. In the heat treated joints, the hardnesses of the HAZ and the base metal of the boron steel side were similar to the maximum hardness of the weld, while those of the HAZ and the base metal of the DP steel side were higher than the maximum hardness.
정병훈,이법이,정호삼,이규식,Chung, Byung-Hoon,Lee, Beob-Yi,Chung, Ho-Sam,Lee, Kyu-Sik 한국현미경학회 1991 Applied microscopy Vol.21 No.2
The authors studied the morphological distinctions of each of the epidermal layers and the time of appearance of the keratohyalin granules and tonofilaments by the processing of development. The skins were obtained from fetal rats at the age of 14th, 16th, 17th, 18th, 19th and 20th day of gestation, of 1st and 3rd day of neonatal life and of 4th week after birth. The specimens were staind with uranyl acetate and lead citrate. The results obtained were as follows. 1. On the 16th-gestation day, the intermediate layer which contained numerous ${\alpha}-and\;{\beta}$-glycogen particles was appeared, and hemidesmosomes and desmosome were observed as well. 2. Tonofilaments were first observed on the 17th gestation day. 3. Above-mentioned intermediate layer was differentiated into the granular layer and the spinous layer on the 18th-gestation day. Keratohyaline granules were appeared in association with the ribosomes and the tonofilaments and the compound granules were lipoid granules which were surrounded by ribosomes at the periphery. 4. Ultimately, keratinization began to take place from the 20th-gestation day. At the age of 4th week, the thickeness of epidermis and the amount of keratohyaline granule and tonofibrils were decreased. It is consequently suggested that in the differentiation process of the rat epidermis, keratinization begins after formation of hemidesmosomes and desmosomes, from which the tonofilaments are formed and after keratohyaline granules are formed. Therefore appearance of the keratohyaline granules and formation of the tonofilament appears to have a close relations with the keratinization process of the rat epidermis.