• Korean Journal of Animal Reproduction
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• v.23 no.3
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• pp.229-237
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• 1999

The influence of ascorbic acid (Asc) and ferrous sulfate (Fe$^{2＋}$) on capacitation, acrosome reaction and fertility in vitro was investigated in boar frozen-thawed spermatozoa with or without preincubation. The addition of 0-1.0 mM Fe$^{2＋}$ to sperm suspensions during preincubation increase acrosome reaction (P＜0.05) and oocyte penetration. These increase are also associated with addition of 0~0.5 mM Asc, but the penetration rates were higher in those without than with sperm preincubation. The addition of 0.1 mM Asc than 0.5 mM in medium with Fe$^{2＋}$ were significantly (P＜0.05) higher on acrosome reaction at 2 h after sperm preincubation. No significant differences, however, were observed in penetration rates among the concentrations of Asc. On the other hand, when preincubation medium containing the Asc was supplemented with 0.1mM Fe$^{2＋}$, the percentage of spermatozoa acrosome-reacted were significantly (P＜0.05) higher than in medium wothout Fe$^{2＋}$, on the contrary, the penetration rate was significantly (P＜0.05) low during in-vitro fertilization. These findings indicate some apparent effects of Fe$^{2＋}$ or Asc addition on acrosome reaction and the fertilizing potential by sperm preincubation.

• Economic and Environmental Geology
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• v.48 no.2
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• pp.177-185
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• 2015

The objective of this study is to evaluate landslide hazard susceptibility and produce the landslide hazard maps for soil slope using checklists as a preliminary investigation method. Tables, proposed by NDMI (National Disaster Management Institute), are applied for slope stability assessment, and are comprised of checklists on soil slopes. Database including engineering properties of soil is constructed through the field survey and results from previous studies for The Mt. Hwangryoeng area at center of Busan. All data related to creating the thematic maps was carried out using ArcGIS 10.0. Results from using this method indicated that soil slope are evaluated from very stable to stable. Moderate stability has been partially presented along the edge of mountain. Results from landslide hazard maps can be used to prevent damage from landslides and facilitate appropriate land use planning.

• Economic and Environmental Geology
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• v.43 no.3
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• pp.249-258
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• 2010

In general, a crustal geomagnetic (or gravity) anomaly compiled at one altitude can be estimated at a different altitude by continuation using the Fourier transform (FT). However, in case of continuation with a great distance between the two elevations, or, in particular, in case of downward continuation, the estimated anomalies by the FT are likely to be mathematically unstable so that the estimated values are not realistic. To solve this problem, two independently measured magnetic field anomalies at different altitudes, such as aeromagnetic and satellite magnetic observations, are implemented to estimate values at in-between altitude for better understanding and interpreting geophysical and geological features. This ‘'dual continuation’' technique is straightforward in the FT and gives a more realistic estimate in all altitudes when we simulated with a set of prismatic bodies at different altitudes. This implies that we add up another constraint like satellite-based observations on the geopotential field modeling for the non-unique geological and geophysical problems to a conventional Fourier-type continuation technique with a single set of observations.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.1357-1365
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• 2011

Reliability analysis-based maintenance system has the merit than elapsed time-based preventive maintenance system. First, it is possible to active handling of rolling stocks failures. In the past, Failure handling activities began when after increase failures rapidly. But if we can continuous manage of reliability than changing of failure tendency can know more quickly. Second, It is possible to using maintenance resources effectively. We can look forward to cost reduction to distributing of much less failures parts's maintenance resources. KORAIL builds reliability system called KTX-RCM for operating high-speed rolling stocks. But existing rolling stocks have not reliability system from the past. Fortunately, KORAIL started ERP system called KOVIS at 2007. KOVIS includes maintenance data for reliability analysis. So in this study analysis failure data for getting reliability number about existing passenger car. And we desire to maintenance connection plan.

• The monthly packaging world
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• s.254
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• pp.103-119
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• 2014

산업통상자원부가 주최하고 한국생산기술연구원이 주관하는 "제8회 미래패키징 신기술 정부포상"시상식이 이번 달 10일 일산 킨텍스 그랜드볼룸에서 열린다. 미래지식산업인 패키징산업 종사자의 긍지와 자부심 함양의 계기를 실천하고, 패키징산업 종사자의 사기진작과 패키징산업 활성화를 도모하기 위해 매년 진행되고 있는 미래패키징신기술 정부포상은 패키징산업 기술인의 기술개발 의욕을 고취하고 패키징산업 기술성과 및 산업발전 기여도에 대한 정부포상를 실현하며 패키징산업 종사자간 정보교류 극대화 및 공동체 의식 함양으로 일체감을 조성시켜왔다는 평가를 받고 있다. 미래패키징 신기술 정부포상은 기업부문 및 학생부문, 그리고 공로부문으로 나누어 수상자를 선정, 진행되고 있다. 기업부문은 패키징 완제품, 친환경패키징, 패키징관련기계(설비) 및 관련부품, 패키징인쇄(라벨링), 패키징원부자재 생산 및 가공공정, 패키징디자인 등의 분야에서 신기술 개발 또는 개선으로 수출신장, 매출 수익 증대 및 발명특허 획득을 통해 패키징 기술력 발전에 기여한 기업의 패키징제품 또는 패키징디자인을 대상으로 하고 있으며, 학생부문은 패키징 디자인 관련분야 전공자로 패키징과 연관된 컨셉으로 상품성, 창의성, 표현성, 친환경성, 지속가능성 등이 어우러진 독창적인 패키징제품 또는 패키징디자인을 대상으로 진행하고 있다. 또한 공로부문은 패키징 산업 관련 산업계, 학계, 연구계, 유관기관에 종사하는 자로서 패키징 관련 핵심 기술개발, 경영, 마케팅 면에서 패키징 산업 발전에 기여한 공적이 뚜렷한 자, 패키징산업발전 정책연구 및 패키징산업 육성에 기여한 기업 또는 개인을 대상으로 하고 있다. 제8회 미래패키징 신기술 정부포상 심사 결과 (주)연우의 'One Material Pump-Bellows'를 비롯 총 4개사가 산업통상자원부 장관상 수상자로 선정됐으며, 공로부문에서는 (사)한국포장협회의 한용교 명예회장((재)한용교장학재단 이사장)과 김형빈 한국공업포장협회 부설 수송포장기술연구소 소장이 수상자로 선정됐다. 본 고에서는 수상작 및 수상자들의 활약상을 살펴보도록 한다.

• Journal of Digital Convergence
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• v.10 no.10
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• pp.129-137
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• 2012

Entering $21^{st}$ Century, the most critical keyword for companies is change and innovation. To achieve it, Obtaining right person becomes more and more important to those companies. It is not only supported by managers in business world but also by academia. However it is not easy to obtain right persons who have right experiences and knowledges. Therefore, the purpose of this study is to build strategic system which support help to hire and manage human resource. In this study, the suggested system is a type of strategic simulation game and job seeker can get several opportunities to be hired by joining the game. this system would help for companies to manage and hire right persons and there will be extra business opportunities. In conclusion, this system based on strategic simulation game would help human resource management and also promote job market and exchanging and trading companies' information and knowledge as well.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.2
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• pp.15-21
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• 2007

In this paper, we propose a technique of a practical symbol acquisition and tracking using a low complex ADC and simple digital circuits for noncoherent asynchronous impulse-radio-based Ultra Wideband (IR-UWB) receiver based on energy detection. Compared to previous approaches of detecting an exact acquisition time that require much hardware resource, the proposed technique is to detect the target symbol by finding the symbol acquisition interval per symbol with a target symbo, thus the complexity of the complete signal processing and power consumption by ADC are reduced. To do this, we define the bit decision window (BDW) and analyze the relation between SNR, hardware resource, size of BDW and BER(Bit Error Rate). Using the results, the optimum BDW size for the minimum BER with limited hardware resource is selected. The proposed synchronization technique is verified with an aid of a simulator programmed by considering practical impulse channels.

• Korean Journal of Plant Resources
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• v.21 no.1
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• pp.41-46
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• 2008

Molecular relationship and genetic diversity of 21 wild tea collections which grown natural region in Korea were investigated based on PCR-RFLP analysis using DFR genes. Approximately 1.4kb fragment of the DFR gene from wild tea samples were successfully amplified use DFR 4+5 primer pair. On the bases of restriction fragment length polymorphism(RFLP) analysis using Hpa II and Mse I enzymes, three different band patterns shown from Hpa II enzyme and showed genetic diversity between same region wild tea group. Six kind of restriction enzyme profiles obtained from digested with restriction endonuclease Mse I and shown two kind of restriction enzyme profiles collected from same region wild tea at Ungpo. The results of RFLP analysis indicated that wild tea showed genetic diversity among different regions of tea groups, but also between same region wild tea.

• Economic and Environmental Geology
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• v.35 no.6
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• pp.567-573
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• 2002

Two-dimensional MT (Magneto-Telluric) modeling is performed to verify the validity of difference arrow for GDS(Geomagnetic Depth Sounding) survey. The electromagnetic mutual coupling between the sea and in-land conductor is used as a criterion that judges the validity of difference arrow. In this study, the mutual coupling between them is examined according to the spatial distance between them and the period of magnetic variations. The difference arrow is valid for conductors located at surface which are far from the sea or when the long period is used, but the mutual coupling is weak for buried conductor in all the periods. However, when a conductor extends vertically down to the deep part, the validity of difference arrow is in doubt, since the strong mutual coupling influences up to the long period. Therefore, to remove the known conductor effect such as sea effect from the observed induction arrow, the mutual coupling between them must be examined and the caution must be exercised in interpreting the resultant difference arrow if mutual coupling between them is strong.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.110-112
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• 2016

In this paper, the captive model test of submerged body using RA test was carried out at the Square Basin. The target model is a submarine with four different types. For the comparison between theory and measurement, hydrodynamic coefficients are calculated according to the described method and compared with RA measurements on Submarine models. in addition, horizontal stability index of underwater vehicle was checked.