• 한국ITS학회:학술대회논문집
• /
• 2004.11a
• /
• pp.7-11
• /
• 2004

• Defense and Technology
• /
• no.4 s.218
• /
• pp.36-47
• /
• 1997

미국의 민군겸용 정책은 겸용기술 연구개발, 겸용생산, 상용능력 활용 등의 3가지 전략으로 구성되며, 획득 개혁안이 제도, 조직, 경영 측면에서 이를 실천할 수있는 실질적인 지원을 하고 있다. 미국과 비슷한 상황에 직면해 있는 우리나라도 새로운 국방기술정책이 요구되고 있으며, 과거의 소극적인 정책에서 벗어나 민과 군의 역량을 최대한 활용할 수 있도록 다각적인 형태의 정책을 추진해야 할 것이다

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.38 no.5
• /
• pp.477-482
• /
• 1993

The study was conducted to investigate the relationships between tobacco leaf yield and changes of leaf dry matters by tobacco growing season. In flue-cured tobacco, leaf yield was high significantly correlated with leaf dry matters from 50 days to 70 days after transplanting. In Burley tobacco, leaf yield was affected differently by the leaf dry matters according to the different growing season. High significant correlation was noted between yield and leaf dry matters at 70 days after transplanting, and having low significant correlation with leaf dry matters at 55, 60, 65 days after transplanting.

• The korean journal of orthodontics
• /
• v.36 no.3 s.116
• /
• pp.171-177
• /
• 2006

The purpose of this study was to evaluate the light microscopic features and the maximum insertional and removal torque value of microimplants, made from titanium grade 2 or 4, in the tibia of 6 rabbits. First, the maximum torque values of microimplants at implantation were measured. After 2, 8, and 12 weeks of healing time, the microimplant-containing segments of tibia of 2 rabbits were removed and the maximum removal torque of each microimplant were measured. Comparisons of histologic examination and insertional and removal torque values were carried out for the two groups of microimplants. Removal torque values were significantly increased in both groups after 8 and 12 weeks as compared to 2 weeks after implantation. Other values measured did not show any statistically significant differences and there were no histological differences between grade 2 and 4 titanium. Based on these results, this study showed that there were no significant differences between grade 2 and 4 titanium. It seems better to use grade 4 titanium for making microimplants because grade 4 titanium is mechanically harder than grade 2 titanium and has similar retention.

• Journal of the Korean Geotechnical Society
• /
• v.33 no.9
• /
• pp.49-60
• /
• 2017

The purpose of this study is to investigate the behavior of a single batter pile with repeated lateral loading through model tests. Repeated loads were applied in one direction and two directions, and lateral resistance and bending moment were analyzed by varying the relative density of the ground. As a result, lateral resistance and maximum bending moment were increased in the order of Out batter, Plumb, and In batter when one-way and two-way dynamic lateral loads were applied. The depth at the maximum bending moment was more deeper with the loading. The moments at bottom layer were decreased in the order of Out batter, Plumb, and In batter but upper moments were increased with the same order. Also, various bottom and upper moments were small when the two-way dynamic lateral load was applied compared to one-way lateral load.

• Journal of the Korea Concrete Institute
• /
• v.29 no.2
• /
• pp.179-187
• /
• 2017

The design provisions for the maximum steel ratio in reinforced concrete flexural members is normally provided to ensure sufficient ductility and economy by steel yielding at member failure. In the Concrete Structural Design Code (2012), the maximum steel ratio is expressed in terms of a net strain in tensile steel, and leading to very high steel ratio in the case of using high strength materials. Thereby, this may result in difficulty to satisfy a required workability at concrete placing. On the contrary, in the Korean Highway Bridge Design Code (Limit State Design) the maximum steel ratio is given in terms of the maximum neutral axis depth ratio that is 0.4. From these results, a rational model for the maximum steel ratio is suggested so as to satisfy a ductility as well as a workability.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.19 no.3
• /
• pp.274-280
• /
• 1986

Velocity variability of Masan Inlet in the northernpart of Chinhae Bay is studied on the basis of the cross-sectional net velocity distributions and its root-mean-square. They were calculated during three consecutive cycles at spring tide as well as two cycles at near tide with precipitations in June and July 1985. During the spring tide, net ebb flow take place in the western channel while net flood flow in the eastern channel of the cross-section. On the contrary, the direction of both net flows during the neap tide with precipitations is reversed. R.M.S. isotachs show that the highest velocity is 15 cm/sec at spring tide and 10.3 cm/sec at neap tide, and the greatest velocity is persistently found at the surface layer of the western channel of the cross-section at each tidal cycle. It is shown that the major part of constituents of the constant flow in the Inlet is the tidal residual current. The density-driven current, however, plays an important role afer the heavy precipitations.

• Explosives and Blasting
• /
• v.35 no.3
• /
• pp.1-8
• /
• 2017

In this paper, parametric studies are conducted to evaluate the contribute effect of multi layered room and pillar mine structures by underground accidental explosions. Influence of PPV(Peak Particle Velocity) obtained from large explosion at a multi layered room and pillar mine was numerically simulated by using AUTODYN. Parameters for contribution rate Analysis was analyzed by the robust design method. Orthogonal array is $L_9(3^4)$, which was adopted in this study, the parameters were pillar height, pillar width, mine span and sill pillar of 3 levels. Results of analysis showed that bottom mine of vertical direction from explosion point are most affected by pillar height, followed by sill pillar thickness, mine span and pillar width. Parameters affecting adjacent mine of horizontal direction from explosion are in the order of pillar width, mine span, pillar height and sill pillar thickness.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.21 no.1
• /
• pp.49-53
• /
• 1992

The released amount of thiocyanate ion in Cruciferous vegetables treated by wet heat, increased as the reaction time goes by and was maximum value after treatment for 30min, but it was not changed by dry heat treatment. When samples were autolyzed by myrosinase, the amount of thiocyanate ion increased gradually as time goes by, was maximum value after 3hrs and much higher than those in the sample treated by wet. The released amount of thiocyanate ion in each sample showed much in cabbage, Chinese cabbage, radish, kale and mustard in the order. The generated amount of indoleacetonitrile by heat treatment increased as time goes by and the generated amount in each sample determined was high in the order of cabbage, Chinese cabbage and radish.

• Journal of Korea Water Resources Association
• /
• v.38 no.10 s.159
• /
• pp.825-839
• /
• 2005

Application of the EST approach for the simulation of the risk-based typhoon hazard potential is described in this paper. For six selected cities In the Korean peninsula, EST simulations for one hundred years were performed one hundred times using historical typhoon data as a training data set. The analytical results of EST simulations were then post-processed to estimate the means, standard deviations, and ranges of variation for the maximum wind velocities and the daily rainfalls. From the comparison of the averages of the wind velocities for the 100 year recurrence interval typhoons, the wind hazard potential of them was revealed to be highest for Mokpo among the six cities, followed by Busan, Cheju, Inchun, Taegu, and Seoul in descending order For the flood hazard potential associated with a typhoon, Busan was ranked to be the highest hazard potential area, followed by Mokpo, Cheju, Seoul, Inckun, and Taegu. In terms of the overall typhoon hazard potential, cities in the southern coastal regions were identified as being exposed to the most severe typhoon hazard.