• 한국수학사학회지
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• 제27권5호
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• pp.329-345
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• 2014

CAGD(Computer Aided Geometric Design) is a branch of applied mathematics concerned with algorithms for the design of smooth curves and surfaces and for their efficient mathematical representation. The representation is used for the computation of the curves and surfaces, as well as geometrical quantities of importance such as curvatures, intersection curves between two surfaces and offset surfaces. The $B\acute{e}zier$ curves, B-spline, rational $B\acute{e}zier$ curves and NURBS(Non-Uniform Rational B-Spline) are basically and widely used in CAGD. The definitions and properties of these curves are presented in this paper. And a brief history of study on the bound for derivative of rational curves in CAGD is also presented.

• 한국의사학회지
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• 제20권2호
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• pp.34-41
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• 2007

Yim Eon Kook was deeply involved in founding Chijongcheong(national tumor medical clinic), a government branch in charge of treating tumors mid-Chosun dynasty. He came to be famous nationwide for curing tumors well and when the royal family was notified of this, they founded the Chijongcheong to supply professional health care. He wrote books on treating tumors such as "chijongjinam" and contributed significantly to the advancement of the tumor treating during his times. He also influenced the development and advancement of tumor-related treatments in late-Chosun as well.

• ALGAE
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• 제21권2호
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• pp.185-191
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• 2006

The morphology and life history of Stylonema reniforme Kajimura (Stylonematales, Rhodophyta) from Japan were investigated and its taxonomic placement was discussed. This species has 6-30 discoid chloroplasts devoid of a pyrenoid in each cell. This is a typical feature of the genus Goniotrichopsis. The species reproduced only by monospores, which were formed by the direct transformation of the vegetative cells similar to the type species Goniotrichopsis sublittoralis Smith. Goniotrichopsis reniformis (Kajimura) Kikuchi comb. nov. was proposed. The asexual life history of the present species was completed in 3-10 weeks at $15-20^{\circ}C$ in culture.

• 한국의사학회지
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• 제34권2호
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• pp.97-108
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• 2021

In this study, we examine Maeng Hwa-seop's academic activities, focusing on articles published in Uirim, JKM (Journal of Korean Medicine), and other branch journals which were affiliated with the Society of Korean Medicine. The present study charts and summarizes the papers published in the above journals. By organizing Maeng Hwa-seop's papers and making tables, we find that his research can be divided into four categories: symptoms and diseases, prescriptions, academic presentations, and translations of medical literatures. Based on this study, we hope that further researches about the academic activities of Maeng Hwa-seop can be conducted in the future.

• 한국문헌정보학회지
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• 제31권1호
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• pp.231-256
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• 1997

대학도서관의 분관설치는 이용자들에게 봉사의 편의를 제공하고 이용자들의 장서접근을 용이하게 하여 궁극적으로 이용율을 높이기 위함이다. 본 연구는 한국 대학도서관에 설치된 분관들이 현재 어떤 상태이며 소기의 목적을 성취하고 있는지를 조사하여 밝히기 위해 한국 대학도서관 분관들의 운영실태를 조사하고 분관의 설치로 이용율의 증가가 일어나고 있는지를 집중적으로 조사하였다. 본 연구의 목적은 (1) 한국의 대학도서관의 분관을 설립하는데 있어서 보편적인 경향을 확인하는 것과 (2) 분관이 대학도서관 전체 이용율에 끼치는 효과를 조사하는 것이다. 이러한 목적을 달성하기 위하여. 본 연구는 도서관장서규모와 학생수, 대학의 역사, 학과수, 중앙도서관의 면적, 도서관 예산과 분관과 상호관련성에 대해 초점을 맞추어 6개 분간을 가진 2개 도서관. 3개의 분관을 설치한 2개의 대학도서관, 분관이 없는 2개 대학도서관등 6개의 대학도서관들을 선택하여 조사하였다.

• 한국도서관정보학회지
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• 제35권1호
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• pp.97-117
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• 2004

광복 후 우리나라 도서관계는 장서의 확충에만 급급하였다. 결과로 20세기 말에 들어와서는 서적을 보존할 공간이 협소하게 되었다. 장서 보존에 있어 중요한 요소의 하나는 자료를 수장할 공간이다. 따라서 도서관계의 중대한 관심사의 하나는 공간문제를 해결하기 위한 보존도서관을 마련하는 것이다. 이 문제를 해결하기 위해 여러 차원의 보존도서관을 설립해야 하는데, 보존이란 '보존' '보호', '복원'의 개념으로 나누어 정의되고 있다. 열람이 주목적이 아닌 자료를 보존하기 위한 도서관은 우리나라에서는 이미 고려시대부터 비롯되었고, 조선시대에는 외사고와 규장각의 규장외각에 계승되었다. 본고는 조선 정조년간에 설치된 규장외각의 설치, 보존도서관으로서 문헌의 '보존', '보호', '복원' 활동에 관해 분석한 것이다.

• 천문학논총
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• 제30권2호
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• pp.169-171
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• 2015

NGC147 and NGC185, paired satellites of the Andromeda galaxy, possess the same order of mass and analogous structures, but they show different star formation and different amounts of interstellar gas and dust. Therefore, we present the first reconstruction of the star formation history of NGC147 and NGC185. Asymptotic Giant Branch stars are highly evolved stars that are brightest in K-band. This maximum K-band magnitude is related to the birth mass of stars. As a result, we have found a 9.9 Gyr old single star formation epoch for NGC185 followed by relatively continuous star formation. NGC147, however, has passed through two star formation episodes; one is as old as ~6 Gyr and the other is as recent as ~850 Myr. Asymptotic Giant Branch stars are also important dust factories; by fitting Spectral Energy Distributions to observed near and mid infrared data for each star, we were able to measure the dust production rates of individual stars; on order of $10^{-5}M_{\odot}yr^{-1}$. Hence, we estimate the total mass entering the interstellar medium to be $1.06{\times}10^{-4}M_{\odot}yr^{-1}$ and $2.89{\times}10^{-4}M_{\odot}yr^{-1}$ for NGC147 and NGC185.

• Earthquakes and Structures
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• 제13권2호
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• pp.103-118
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• 2017

In vertical seismic isolation (VSI), a building is partitioned intentionally by vertical layers into two dynamically different substructures for seismic response reduction. Initially, a 1-story frame was partitioned into two substructures, interconnected by viscous and visco-elastic links, and seismic responses of the original and the vertically isolated structures (VIS) were obtained, considering a large number of stiffness and mass ratios of substructures with respect to the original structure. Color contour graphs were defined for presentation and investigation of large amounts of output results. Dynamic characteristics of the isolated structures were studied by considering the non-classical damping of the system, and then the effects of viscous and visco-elastic link parameters on the modal damping ratios were discussed. On this basis, three states of mass isolation, interactional state, and control mass were differentiated. Response history analyses were performed by Runge-Kutta numerical method. In these analyses, interaction of isolation ratios and link parameters, on response control of VIS was studied and the appropriate ranges for link parameters as well as the optimal ranges for isolation ratios were suggested. Results show that by using the VSI technique, seismic response reduction up to 50% in flexible substructure and even more in stiff substructure is achievable.

• Structural Engineering and Mechanics
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• 제88권3호
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• pp.263-271
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• 2023

Base isolation is a widely used technique for the seismic control of structures as it reduces the structural seismic demand. However, displacement of the isolation layer is not economically feasible in congested urban areas. To resolve the issue, an innovative system is proposed here to isolate both horizontally at the base and vertically in the upper portion of the structure. A simplified linear three degree-of-freedom (3DOF) model of the system that considers the mass and stiffness ratios of the substructure has been introduced and analyzed in MATLAB by spectrum analysis. The 3DOF model results revealed that, when the period of the soft substructure reaches 2.5 times that of the stiff substructure, the isolation and the lower substructure responses decrease by 65% and 51%, respectively. Time-history analysis of a MDOF system at three frequency ratios under a wide range of ground motions indicated that, at the expense of accepting a certain large drift by the soft substructure in the upper portion of the structure, base isolation displacement can be decreased by 10%.

• 한국의사학회지
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• 제15권2호
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• pp.83-100
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• 2002

The Oriental Obstetrics and Gynecology is a branch of the Oriental Medicine that treat of physiological and pathological diseases of the female. The origin of the Oriental Obstetrics and Gynecology begins at the pregnancy and delivery of the women. Therefore it has significant meanings about the birth of human beings. The field of this study has been very important to the Oriental Medicine. Accordingly the present writer is planning to study of the level of the Oriental Obstetrics and Gynecology and its effects in those days, through Heo Jun(許浚)'s "Eonhaetaesanjipyo" ("諺解胎産集要") that is a work of the Oriental Obstetrics and Gynecology books in the history of Korean Oriental Medicine.