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수록정보
수록범위 : 33권1호(2016)~35권1호(2018) |수록논문 수 : 29
충남과학연구지
35권1호(2018년 12월) 수록논문
최근 권호 논문
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1와이블 분포함수의 보조재생함수에 대한 근사

저자 : 배종호 ( Jongho Bae )

발행기관 : 충남대학교 기초과학연구원 간행물 : 충남과학연구지 35권 1호 발행 연도 : 2018 페이지 : pp. 1-7 (7 pages)

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대기행렬모형에서 얻은 결과에 흔히 포함되는 보조재생함수는 그 계산의 어려움 때문에 현상에 적용하기가 힘들다. 본 논문에서는 보조재생함수에 대한 두 근사함수를 소개하고 고객의 서비스시간이 와이블분포를 따르는 경우에 근사함수의 정확도를 평가한다.


It is very difficult to compute the auxiliary renewal function which is frequently used in many formulas derived in queueing models. In this paper, it is introduced two approximations to auxiliary renewal function, and we evaluate the accuracy of the approximations to auxiliary renewal function in case that the service times of customers follow Weibull distribution.

2스마트폰 센서와 마이크로프로세서 기반 측정 장치의 비교

저자 : 오병성 ( Byungsung O ) , 박동렬 ( Dongryul Park )

발행기관 : 충남대학교 기초과학연구원 간행물 : 충남과학연구지 35권 1호 발행 연도 : 2018 페이지 : pp. 9-13 (5 pages)

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여러 가지 센서가 내장된 스마트폰을 학생 물리 실험에 사용할 수 있기에 가속도 센서와 조도 센서를 추의 주기 측정에 활용하여 보았다. 그 결과를 실험실에서 널리 사용 중인 마이크로 프로세서 장치(MBL)의 결과와 비교하여 보았다. 알맞은 무료 앱을 사용하여 측정 간격을 0.01 s 또는 그 이하로 설정할 수 있어 학생 실험에 활용할 수 있음을 확인하였다.


Smartphones with several sensors have been tested for physics lab. In this research, the acceleration and the lux meters were tested for the pendulum motion experiment and compared to the microprocessor-based lab(MBL): a motion sensor and a photogate used in the lab. With the appropriate apps, the measurements can be made every 0.01 s or shorter, which means they could be used instead of MBL equipments in some cases.

3그래핀의 페르미온 개스에 의한 열팽창계수

저자 : 임국형 ( Gukhyung Ihm )

발행기관 : 충남대학교 기초과학연구원 간행물 : 충남과학연구지 35권 1호 발행 연도 : 2018 페이지 : pp. 15-20 (6 pages)

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We present the thermal expansion coefficient of Fermi gas in graphene. We use the Sommerfeld expansion method to obtain the heat capacity and the relation between chemical potential and electron density, which are crucial in determining the thermal expansion coefficient. As a result, in contrast to ordinary two dimensional electron systems, the compressibility of graphene has been shown to have non-linear temperature dependence. The possibility of negative thermal expansion coefficient are also discussed in accordance with recent experiments.

4고인돌과 북두칠성

저자 : 김광태 ( Kwang-tae Kim )

발행기관 : 충남대학교 기초과학연구원 간행물 : 충남과학연구지 35권 1호 발행 연도 : 2018 페이지 : pp. 21-29 (9 pages)

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Among many archaeoastronomical remains, table stones with engraved cup marks are found in various forms in Korea. These holes are of varying sizes, some are small enough to hold fingers, and some are big enough to be cups. Constellations have evolved from ancient times into a national instrument of government, which is often called as “觀象授時”, as a reliable means of deciphering astrological meaning of the appearance of the array of Sun, Moon, and stars. In particular, the constellation has developed into a status board that reflects the state of the country, an essential tool of astrology. Some special constellations of these were worshiped as guardians of tribes, and also were used as a liturgical tool for praying for the permanent protection and security of the dead. The Big Dipper (北斗) or the Seven stars (七星) is the most characteristic and most often found among the constellations of cup marks, and this is well explained by the understanding of the ethnic tradition in that the Seven star religion (七星信仰) had been developed as the foundation of our ancestor folk religion.

5UFO에 대한 융의 이론 소개

저자 : 김광태 ( Kwang-tae Kim )

발행기관 : 충남대학교 기초과학연구원 간행물 : 충남과학연구지 35권 1호 발행 연도 : 2018 페이지 : pp. 37-43 (7 pages)

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Carl Jung's 『Flying Saucers: A Modern Myth of Things Seen in the Skies』is reviewed. By now two major theories for Ufo origin have been survived: Extraterrestrial Hypothesis (ETH) and Multidimensional Visitation Hypothesis (MVH). I introduce both theories and briefly discuss the impact of Ufo on contemporary political sociology.

6SOHO 흑점 사진에서 측정한 태양 흑점의 각속도 분석

저자 : 오갑수 ( Kap Soo Oh )

발행기관 : 충남대학교 기초과학연구원 간행물 : 충남과학연구지 35권 1호 발행 연도 : 2018 페이지 : pp. 39-59 (21 pages)

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Sunspot angular velocities are measured from the Solar and Heliospheric Observatory (SOHO) Helioseismic and Magnetic Imager (HMI) continuum images taken from January 1st 2011 to August 21st 2017 data which were also used in Paper I and II. Comparing with the angular velocity calculated from NASA's empirical formula, a parallel component of relative differential angular velocity to the solar equator in each sunspot is measured, also a perpendicular component from the latitude movement of the sunspot.
The results show that the distributions of angular velocities toward the equator or toward the pole are symmetric and there is no latitude dependence. However there are more sunspots that are faster in parallel angular velocities than the expectation from NASA's empirical formula. This reflects that solar rotation at the surface is faster than that of the convection zone, which should be explained by further research.

7고반응성 폴리부텐

저자 : 박민섭 ( Min Sup Park ) , 김영준 ( Yeong-joon Kim )

발행기관 : 충남대학교 기초과학연구원 간행물 : 충남과학연구지 35권 1호 발행 연도 : 2018 페이지 : pp. 61-64 (4 pages)

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Highly reactive polyisobutylene(HRPB) has more than 70% vinylidene content so that it is easily converted to various derivatives, that can be used as fuel detergent additives and lubricating additives. In this paper, we introduced the preparation of HRPB by using cationic polymerization and the purification of the products with high vaccum distillation. Also, we showed the characterization of HRPB from gel permeation chromatography, 13C-NMR, and so on.

8Crystal Structure of Hydrated Europium(Ⅲ) Nicotinate, Eu2(Nic)6(H2O)4

저자 : Younbong Park

발행기관 : 충남대학교 기초과학연구원 간행물 : 충남과학연구지 35권 1호 발행 연도 : 2018 페이지 : pp. 65-71 (7 pages)

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Hydrated europium(III) nicotinate compound has been synthesized and structurally characterized by single crystal X-ray diffraction. The structure is dimeric and then the dimers expand into complex 3D framework through extensive hydrogen bonds between water molecules and N atoms and O atoms in nicotinate ligands. In this dimeric unit there are four bridging and two chelating nicotinate ligands and four water molecules with two Eu3+ ions. The Eu3+ ion forms a distorted square antiprism with 8 oxygen atoms around.

9스포츠 커뮤니티 시설 운영 개선 방안 : 대도시 공동주택을 중심으로

저자 : 김정동 ( Jeong-dong Kim ) , 이종길 ( Jong-kil Lee )

발행기관 : 충남대학교 기초과학연구원 간행물 : 충남과학연구지 35권 1호 발행 연도 : 2018 페이지 : pp. 73-85 (13 pages)

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The purpose of this study was to develop strategies to improve management of apartment fitness centers through investigating actual problems and improvement strategies by analysing user`s using patterns and manager`s management conditions
To achieve study purpose, firstly, survey was performed with questionnaires to investigate problems of the fitness centers on 485 users of 19 places in D metro-city. And, 9 apartment fitness centers` managers were interviewed.
Study results from above process were as follows. First, according to the users, small space, unsuitable place, insufficient instruments, lack of convenient facilities, non-expertise instructors, lack of programs, and fixed fee were suggested. Second, improvement strategies from manager interviews were rearrangement of space and fitness equipments, offering of systematic and scientific programs, and systematic coaching of professionals. Third, autonomy of management office type needed setting networks among fitness centers to share fitness equipments and instructor, continuous promotion and advertisement, and diversifying of fares. Consignment type needed extending of manager`s working range to rotate fitness equipments and instructors with developing various programs and rotation educating of instructors, continuous promotion and advertisement, and diversifying of fares. Finally, overall consignment type needed departmentalization and specialization with plans from demand predicting, systematic management focused on user, diversifying of fares, development of systematic and various programs, and continuous promotion and advertisement.

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1연안해역에서 석유오염물질의 세균학적 분해에 관한 연구

(2006)홍길동 외 1명심리학41회 피인용

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2미국의 비트코인 규제

(2006)홍길동심리학41회 피인용

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2미국의 비트코인 규제

(2006)홍길동41회 피인용

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목원대학교 경북대학교 전남대학교 한경대학교 한양대학교
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