• 한국동굴학회:학술대회논문집
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• 한국동굴학회 1994년도 제 6차 국제학술회 ASIA 동굴 SIMPOSIUM
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• pp.108-109
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• 1994

Cheju island is situated at about 90km south of southern most tip of the Korean peninsula. Its shape is an ellips with size of 80$\times$$40km^2$, and it is characterized by a symmetrical form whose peak is Mt. Halla (1950m). Major chemical composition of the rock samples from Manjang gul cave is determined by XRF using the fundamental parameter method consisting of fully auto quantitative analysis, semi quantitative analysis (order estimation) and group quantitative analysis. Judging from chemical composition ($SiO_2=53.07Wt% Fe_2O_3=11.34Wt%, MgO=6.48Wt%, Na_2O=3.07Wt%, K_2O=1.05Wt%$), this rocks may belong to non alkalic basalt. K-Ar ages of two rocks samples from the Manjang gul cave are also determined. The discrepancy of K-Ar ages is found. They are 0.03Ma and 0.42Ma, respectively. This paper describes some problems experienced in dating young volcanic rocks and then discusses chemical composition, X-ray fluorescence analysis and the age of the formation of a lava tunnel such as Manjang gul cave in cheju Island.

• 동굴
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• 제20권21호
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• pp.34-43
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• 1989

Cheju island is situated at about 60km south of southern most tip of the Korean peninsula. Its shape is an ellips with size of 80*40$\textrm{km}^2$, and it is characterized by a symmetrical form whose peak is Mt. Halla(1950m). Major chemical composition of the rock samples from Manjang gul cave is determined by XRF using the fundamental parameter method consisting of fully auto quantitative analysis, semi quantitative analysis (order estimation) and group quantitative analysis. Judging from chemical composition (SiO$_2$ = 53.07Wt％, Fe$_2$O$_3$ = 11.34Wt％, MgO=6.48Wt％, Na$_2$O=3.07Wt％, $K_2$O=1.05Wt％), this rocks from the Manjang gul cave are also determined. The discrepancy of K-Ar ages is found. They are 0.03 Ma and 0.42Ma, respectively. This paper describes some problems experienced in dating young volcanic rocks and then discusses chemical composition, X-ray fluorescence analysis and the age of the formation of a lava tunnel such as Manjang gul cave in cheju Island.

• 응용통계연구
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• 제29권6호
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• pp.1007-1023
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• 2016

본 글은 역사학, 그 중에서 한국사 연구에서 활용 가능한 빅데이터 분석 방법론을 모색하고, 이를 활용한 '디지털 역사학'의 가능성을 검토하는 것을 목적으로 한다. 방대한 '한국사 빅데이터'를 활용한 한국사 연구를 위해서는 기존의 질적분석 방법론뿐만 아니라 양적분석 방법론이 모색되어야 한다. 이를 위해서는 다양한 학문 분야와의 학제 간 융합연구가 요청된다. 본 글에서는 '한국사 빅데이터'를 활용한 다양한 융합연구의 출현을 고대하면서, 학제 간 융합연구의 연구방법론을 제안하고, 이를 적용한 연구의 한 사례를 소개하였다. 즉, 문장의 의미를 분석하는 텍스트 분석방법으로 '한국사 빅데이터'에서 원하는 정보를 추출한다면, 양적분석 방법론의 단점으로 지적되는 '행간의 의미읽기의 부재'를 점차 보완해 갈 수 있을 것이다. 그리고 이러한 방법론으로 구축한 데이터베이스를 바탕으로 준지도 학습(Semi-Supervised Learning) 방법론을 적용할 경우, 사료가 충분하지 않은 전근대 한국사의 역사적 인물과 사건들을 분석하는데 유용하게 활용될 것으로 기대된다. 분석 결과를 직관적으로 보여주는 시각화를 통해서도 평면적 연구에서 찾아내지 못한 역사적 사실들을 밝혀낼 수 있을 것이다. 이제 '디지털 역사학'의 서막이 오른 것이다.

• 한국연초학회지
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• 제31권2호
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• pp.95-106
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• 2009

Semiquantitative analysis by ICP-MS has proven to be a powerful tool for fast screening, in addition, it does not require the element of interest to be present in the calibration standard, making it especially useful for the analysis of unknown samples. In this study, seven cigarette samples were analyzed by the rapid semi-quantitative analysis method based on the ICP-MS. For each cigarette sample, cut tobacco, cigarette paper, filter (before and after smoking), and smoke condensate were analyzed. The accuracy of the analysis technique was evaluated by comparing results obtained from Calibration Check Standard(CCS) and calibration method. Relative Percentage Error(RPE) value of all elements measured for three CCS showed a stable result of less than ${\pm}20%$. Compared to full quantitative analysis by calibration method, the results for cigarette samples showed average error within ${\pm}15%$.

• Structural Engineering and Mechanics
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• 제64권1호
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• pp.81-92
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• 2017

Many materials in engineering exhibit different modulus in tension and compression, which are known as bi-modulus materials. Based on the bi-modulus elastic theory, a modified semi-analytical model, by introducing a stress function, is established in this paper to study the mechanical response of a bi-modulus cylinder placed in an axisymmetric temperature field. Meanwhile, a numerical procedure to calculate the temperature stresses in bi-modulus structures is developed. It is proved that the bi-modulus solution can be degenerated to the classical same modulus solution, and is in great accordance with the solutions calculated by the semi-analytical model proposed by Kamiya (1977) and the numerical solutions calculated both by the procedure complied in this paper and by the finite element software ABAQUS, which demonstrates that the semi-analytical model and the numerical procedure are accurate and reliable. The result shows that the modified semi-analytical model simplifies the calculation process and improves the speed of computation. And the numerical procedure simplifies the modeling process and can be extended to study the stress field of bi-modulus structures with complex geometry and boundary conditions. Besides, the necessity to introduce the bi-modulus theory is discussed and some suggestions for the qualitative analysis and the quantitative calculation of such structure are proposed.

• 분석과학
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• 제28권2호
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• pp.79-85
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• 2015

TLC (SiO₂) 상에서 3가지 유사 암페타민 류 아민 화합물과 3가지 유도체화 시약 사이의 반응으로부터 얻어진 아민유도체의 이미지 분석으로부터 암페타민 류 화합물에 대한 신속하고 경제적인 반정량적인 분석방법을 제시하기 위하여 선행 실험을 하였다. TLC상 직접적인(in situ, co-spot) 유도체화 반응의 적정화를 시도하였고 그 TLC 결과물들을 디지털카메라로 촬영하여 이미지를 얻은 후 2가지의 이미지 분석 프로그램(CP Atlas 2.0 및 ImageJ)에 적용하여 재현성(RSD; %)과 상관성(R²)을 각각 확인 및 비교하였다. 그 결과, 반응 조건에 대한 조정이 필요하였고(반응 온도 등) 각 시료별 2가지의 농도(0.5 mg/mL 및 0.01 mg/mL)에서 반응의 재현성은 0.69~5.50% 범위이었으며 반응(2 µL per spot)의 생성물과 아민의 농도에 대한 상관성은 0.1~0.005 mg/mL의 농도 구간에서 가장 높게 나타났다(R²> 0.9906). 또한, 두 가지 프로그램 모두 재현성과 직선성에 대한 유사한 결과를 나타내어 직접적인 유도체화 반응과 TLC 이미지에 대한 이들 프로그램을 사용한 분석이 아민 화합물에 대한 반정량적인 분석으로 사용될 수 있는 가능성을 보였다.

• International Journal of Aeronautical and Space Sciences
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• 제17권4호
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• pp.565-578
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• 2016

A probabilistic based systems approach is addressed in this study for the reliability prediction of solid rocket motors (SRM). To achieve this goal, quantitative Failure Modes, Effects and Criticality Analysis (FMECA) approach is employed to determine the reliability of components, which are integrated into the Fault Tree Analysis (FTA) to obtain the system reliability. The quantitative FMECA is implemented by burden and capability approach when they are available. Otherwise, the semi-quantitative FMECA is taken using the failure rate handbook. Among the many failure modes in the SRM, four most important problems are chosen to illustrate the burden and capability approach, which are the rupture, fracture of the case, and leak due to the jointed bolt and O-ring seal failure. Four algorithms are employed to determine the failure probability of these problems, and compared with those by the Monte Carlo Simulation as well as the commercial code NESSUS for verification. Overall, the study offers a comprehensive treatment of the reliability practice for the SRM development, and may be useful across the wide range of propulsion systems in the aerospace community.

• Clinical and Experimental Reproductive Medicine
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• 제34권4호
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• pp.275-283
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• 2007

목 적: 본 연구에서는 생리혈에 존재하는 탈락된 자궁내막조직에서의 자궁내막증 관련 유전자들의 발현 양상과 자궁내막증 병태생리와의 관련성을 살펴보고자 하였다. 연구방법: 자궁내막증으로 확진된 환자 (n=16)와 정상 대조군 (n=26)에서 생리주기 2$\sim$3일째 Wallace catheter로 채취한 생리혈로부터 탈락된 자궁내막조직을 분리하였다. 기존의 연구들에서 보고된 12종류의 자궁내막증 관련 유전자들의 mRNA 발현 양상을 semi-quantitative RT-PCR 방법으로 비교, 분석하였다. 결 과: 생리혈에서 분리한 탈락된 자궁내막조직은 조직학적 관찰을 통해 자궁내막조직임을 확인하였다. 총 12가지 종류의 자궁내막증 관련 유전자에 대한 RT-PCR 분석에서 telomerase, c-kit, aromatase등의 mRNA 발현이 관찰되지 않았다. 세포사멸 (apoptosis)과 관련성이 있는 fas, fas ligand, bcl-2, bax 유전자와 stem cell factor, ER-$\alpha$/$\beta$, endometriosis protein-I, secretory leukocyte protease inhibitor 등의 mRNA 발현 양상은 자궁내막증으로 확진된 환자군과 대조군에서 통계적으로 유의한 차이를 나타내지 않았다. 결 론: 결론적으로 자궁내막증과 관련된 다양한 유전자들의 발현 양상을 생리혈에 존재하는 탈락된 자궁내막조직에서 분석하였지만 의미성이 있는 유전자를 동정하지는 못하였다. 이는 자궁내막조직의 생리학적 특징인 생리주기에 따른 유전자 발현의 역동적인 변화와 관련이 있을 것으로 생각된다.

• 한국안전학회지
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• 제33권6호
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• pp.37-41
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• 2018

Process safety technology has developed from qualitative methods such as HAZOP (hazard and operability study) to semi-quantitative methods such as LOPA (layer of protection analysis), and quantitative methods are actively studied these days. Quantitative risk assessment (QRA) is often based on fault tree analysis (FTA). FTA is efficient, but difficult to apply when failure events are not independent of each other. This problem can be avoided using a Markov process (MP). MP requires definition of all possible states, and thus, generally, is more complicated than FTA. A method is proposed in this work that uses an MP model and a Weibull distribution model in order to construct a reliability model for multiple dependent failures. As a case study, a pressure safety valve (PSV) is considered, for which there are three kinds of failure, i.e. open failure, close failure, and gas tight failure. According to recently reported inspection results, open failure and close failure are dependent on each other. A reliability model for a PSV group is proposed in this work that is to reproduce these results. It is expected that the application of the proposed method can be expanded to QRA of various systems that have partially dependent multiple failure states.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회 2007년도 추계학술대회 및 정기총회
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• pp.43-57
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• 2007

This paper considers the technological competitiveness of aircraft infra industries that are bases of the aircraft industry development in Korea. We performed focus group interviews to aircraft industry specialists and classified the aircraft infra industries by eight fields: metallurgical assembly, general machinery, precision instruments, materials & parts, communication appliances, computer, semi-conductor/ electronic component, electronics. Through the United States patents analysis for the G7 countries and Korea during 1995-2006, we identified the technological specificities and competences of each country. RTA(Revealed Technology Advantage) index and CII(Current Impact Index) are used to examine the technological specificity and technological competence respectively. Finally, we introduced TCI(Technological Competitiveness Index) which could reflect quantitative level as well as qualitative level of patents for each aircraft infra industry. The results show that Korea has occupied the technological competitiveness in the semi-conductor and electronic component industry out of eight aircraft infra industries, and achieved a competitive edge in communication appliance industry in the mid 2000s.