• 대한안전경영과학회지
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• 제9권4호
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• pp.1-9
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• 2007

The Korean government had enacted 'Special Regulation on the Safe Maintenance of Facilities' and carried out regular safety inspections since the mid-1990s, consequently establishing and enforcing an effective maintenance and management system. And throughout this entire process, the government searched for new methods to increase the overall effectiveness of the system. Nevertheless, the reality is that our society remains structurally unprepared to implement a commercial mindset that views the concept of "safety" as a product that can be traded in the open market based on supply and demand. Therefore, the government should establish mid to long-term plans to implement such a system in successive stages.

• Archives of Pharmacal Research
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• 제18권2호
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• pp.75-78
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• 1995

The analysis method nad stability test of antineoplaston A10, a new anticancer drug candidate, were established. A10 and phenylacetyl- L-glutamine, one of the degradation products, can be detected by high-performance liquid chromatography. The degradation kinetics of antineoplaston A10 in aqueous solutions from pH 1 to 10 buffers were carried out at 40, 50 and 60.deg.C. Pseudo-first order kinetics were obtained throughout the entire pH ranges studied. The pH-rate profiles showed that antineoplaston A10 was very unstable in alkaline conditions and most stable at pH 4.

• Bulletin of the Korean Chemical Society
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• 제11권5호
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• pp.407-410
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• 1990

Three binary ion-exchange isotherms of zeolite A have been determined using 0.1 M solutions of the aqueous nitrates for the one-step preparation of particular mixed-cation zeolite A compositions. Analyses were done primarily by flame emission spectrometry (FES), together with crystallographic determinations of $Cs^+$ and colorimetric determinations of $NH_{4^+}$. Corrections for a presumed impurity of extra-lattice species in powder sample were made for the determination of $Na^+$. The $Cs^+-Ag^+$ isootherm indicates a strong selectivity for $Ag^+$ through the entire range of zeolite composition. The $Ag^+-Na^+$ isotherm agrees very closely with that reported by Sherry and Walton, and that of $NH_{4^+}-Na^+$ resembles those obtained using zeolite pellets.

• Geomechanics and Engineering
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• 제28권4호
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• pp.405-419
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• 2022

Cavity expansion and contraction solutions for cylindrical and spherical cavities in unsaturated residual soils are presented in this paper. Varying soil state in the plastic zone is accounted by a numerical approach, wherein an element-by-element discretization of the plastic zone of both expanding and contracting cavities is carried out. Unlike existing methods utilizing self-similarity technique, the solution procedure enables the prediction of entire soil-state at any stage of expansion and subsequent contraction. It is also applicable for both cavity creation and expansion problems. The approach adopts constant contribution of suction to effective stress (constant X^s drainage condition) for analysis. The analysis procedure is validated by interpreting the previously reported pressuremeter test results in lateritic residual soil. The typical cavity expansion and contraction characteristics of unsaturated Indian lateritic soil were then examined using this solution procedure. The effect of initial soil-state on cavity limit pressure, plastic radius, reverse yield pressure, and reverse plastic radius are also presented.

• 디지털산업정보학회논문지
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• 제18권4호
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• pp.41-46
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• 2022

In the fourth industrial era, when various technologies are fused and combined, new and advanced technologies from other industries are used extensively in the maritime industry field. New security threats are also increasing along with the development of new technologies. In addition, in incorporating convergence technologies into the maritime industry, various problems, such as communication definitions and procedures between technologies and customer-customized delays, occur. In this paper, for the problems mentioned above, research results on the network configuration of safer autonomous vessels by supplementing and fusing existing solutions rather than developing new technologies are proposed. In conclusion, the entire network consists of VDI and presents additional configurations to ensure confidentiality, integrity, and availability, which are the three security elements. According to the composition of such a convergence network, it is intended to help prepare countermeasures to protect internal data from external threats.

• 한국정보통신학회논문지
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• 제23권5호
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• pp.613-621
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• 2019

시중에 가장 많이 보급 된 도어락의 경우 1차원적 문제로 가장 많이 사용하는 영역이 닳아 특별한 공격방법을 사용하는 것이 아닌 닳은 영역으로 하여금 비밀번호 유추를 가능하게 한다. 이를 해결하고자 번호를 섞어 무작위로 표출하는 키패드 등 다양한 방법들이 소개되고 있지만 이 역시 완벽하게 안전하지 못 하다. 여태까지 나온 모든 해결법의 공통점은 키패드를 누르는 영역이 고정되어 있다는 점이다. 본 논문에서는 그 점을 역으로 생각하여 키패드 전체 영역 안에 전체 영역보다 작은 새로운 영역을 만들어 새로운 영역의 키패드를 무작위하게 움직이게 하여 비밀번호를 유추하지 못 하게 한다. 본 기법을 사용할 경우 키패드의 번호는 그대로 둠에도 불구하고 shoulder surfing attack 등이 불가능하여 새로운 유형의 키패드를 최초로 제안한다.

• 천문학회지
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• 제49권3호
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• pp.93-107
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• 2016

Augmenting the Wide Field Infrared Survey Telescope (WFIRST) microlensing campaigns with intensive observations from a ground-based network of wide-field survey telescopes would have several major advantages. First, it would enable full two-dimensional (2-D) vector microlens parallax measurements for a substantial fraction of low-mass lenses as well as planetary and binary events that show caustic crossing features. For a significant fraction of the free-floating planet (FFP) events and all caustic-crossing planetary/binary events, these 2-D parallax measurements directly lead to complete solutions (mass, distance, transverse velocity) of the lens object (or lens system). For even more events, the complementary ground-based observations will yield 1-D parallax measurements. Together with the 1-D parallaxes from WFIRST alone, they can probe the entire mass range M ≳ M_⊕. For luminous lenses, such 1-D parallax measurements can be promoted to complete solutions (mass, distance, transverse velocity) by high-resolution imaging. This would provide crucial information not only about the hosts of planets and other lenses, but also enable a much more precise Galactic model. Other benefits of such a survey include improved understanding of binaries (particularly with low mass primaries), and sensitivity to distant ice-giant and gas-giant companions of WFIRST lenses that cannot be detected by WFIRST itself due to its restricted observing windows. Existing ground-based microlensing surveys can be employed if WFIRST is pointed at lower-extinction fields than is currently envisaged. This would come at some cost to the event rate. Therefore the benefits of improved characterization of lenses must be weighed against these costs.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2006년도 정기학술발표대회 논문집
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• pp.37-44
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• 2006

가톨릭중앙의료원 새병원 건립공사는 건설에 대한 전문적인 지식이 부족한 발주처를 대신하여 병원기획 단계부터 개원에 이르기까지 CM사가 발주처의 대리인으로 프로젝트 전 과정을 관리하는 대형병원건립 프로젝트이다. 본 사업은 병원건립 프로젝트에서 국내최초로 CM을 도입한 사례로서 그 의미를 찾을 수 있다. 즉, 건설본부조직을 구성하여 많은 인원을 병원의 직원으로 고용하지 않고서도 대형 프로젝트를 성공적으로 수행할 수 있다는 가능성을 보여준 최초의 사례이다. 이에 본 사례연구에서는 CM사가 참여하면서 Pre-Con.단계에서 적용된 건설사업관리 업무를 기준으로 작성하였으며, 이를 통하여 병원공사에 있어서 CM 도입의 필요성을 검토하고, CM적용 효과를 분석함으로써 향후 병원공사에서의 CM의 확대 적용에 기여하고자 한다.

• 패션비즈니스
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• 제12권3호
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• pp.153-166
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• 2008

The purpose of this research is to analyze the overall process of the wedding industry - arranging domestic wedding firms and formulating a database related to the business. Simultaneously, with all the data in hand the research attempts to seek flaws within the wedding industry and tries to offer solutions to revitalize the industrial section. Because the list of articles is enormously expansive, for the purpose of basic research, objects have been selected according to the process presented below. Wedding-product firms have been classified within the boundaries of dresses, studios, and makeup firms; distributing channels are mainly focused on wedding planners and related-consulting firms; related departments of universities and wedding organizations are illustrated as well. Due to the unorganized system of this particular field, the research process has been conducted with materials from personal experiences, newspapers, magazines, Internet websites, documents, and interviews with wedding-related firms and organizations, and professors. As a result, over 13 subjects which formulate a market structure of over 30 trillion won. However, due to lack of systemization of the industry, as it expands, numerous problems occur. Excessive competition between wedding-consulting firms and the lack of reliable education for wedding planners, unnecessary external investment and the lack of product research, false Information from the Internet puts the entire industry in a inefficient position. Organizations such as Korea Traditional clothes Industrial Union, Korea Wedding Consulting Association, Korea Martial Industrial Promotion Association(KOMIPA) etc, are made to seek for solutions. For the wedding industry to revitalize, wedding-product firms, wedding planners and consulting firms must maintain an organic relationship every season. They must systemize a proper distribution system, with wedding-product companies enhancing the quality of products, wedding planners organizing wedding plans with responsibility, and consulting firms focusing not only on profits. In order to make high-valued products, wedding-product companies must put their greatest effort in producing talented minds, and universities with related departments must do so as well. In other words, the industrial and educational section of our society must cooperate through a sophisticated system. In addition, related organizations must act to receive governmental support in order to support the industry.

• 한국표면공학회지
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• 제52권5호
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• pp.265-274
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• 2019

Formation behavior of PEO (Plasma Electrolytic Oxidation) films on AZ31 Mg alloy was investigated under application of 310 Hz AC as a function of $Na_3PO_4$ concentration from 0.02 M to 0.2 M. Film formation voltage and in-situ observation of arcs generated on the specimen surface were recorded with time, and surface morphologies of the PEO films were investigated using optical microscopy, confocal scanning laser microscopy and scanning electron microscopy. PEO film formation voltage decreased linearly with increasing $Na_3PO_4$ concentration which is attributed to the increase of solution pH. PEO films were grown uniformly over the entire surface in $Na_3PO_4$ solutions between 0.05 M and 0.1 M. However, non-uniform PEO films with white spots were formed in $Na_3PO_4$ solutions containing more than 0.1 M. Thickness and roughness of PEO films on AZ31 Mg alloy increased linearly with increasing $Na_3PO_4$ concentration and their increasing rates appeared to be much higher under 1 M than above 1 M. The experimental results suggest that phosphate ions can contribute to the formation of PEO films but higher $Na_3PO_4$ concentration more than 1 M results in local damages of PEO films due to repeated generation of white arcs at the same surface site of AZ31 Mg alloy.