• Journal of the KSME
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• v.55 no.10
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• pp.26-30
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• 2015

이 글에서는 제4세대 원전 고온구조재료인 Gr. 91강을 대상으로 하여 장시간 크리프 수명을 예측하고 파단수명을 확률적 신뢰도를 가지고 평가할 수 있는 방법에 대해 실 예제를 통하여 서술한다.

• The monthly packaging world
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• s.216
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• pp.110-127
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• 2011

화학물질 등록 및 평가 등에 관한 법률을 제정함에 있어 국민에게 널리 알려 의견을 듣고자 그 제정 이유와 주요내용을 행정절차법 제41조의 규정에 의하여 다음과 같이 공고했다. 본 고에서는 주요 내용을 살펴보도록 한다.

• Journal of the Korean Society of Propulsion Engineers
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• v.10 no.4
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• pp.77-84
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• 2006

With the development of micro/nano spacecraft, concepts of micro propulsion are introduced for orbit transfer and drag compensation as well as attitude control. Micro solid propellant thruster has been attention as one of possible solution for micro thruster. In this paper, micro solid propellant thruster is introduced and research on basic components of a micro solid propellant thruster is reported. Micro Pt igniter was fabricated through negative patterning and quantitative effect of geometry was estimated. The characteristic of HTPB/AP solid propellant was investigated to measure the homing velocity. A combustion chamber was fabricated by means of anisotropic etching of photosensitive glass. Finally, micro solid propellant thrusters having various geometries were fabricated and tested.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.2 no.1
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• pp.34-42
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• 1990

The tides in the Saemanguem Area, the western coast of Korea have been examined based on simulations with barotropic depth-integrated model. As a first step tidal computations were performed with open-boundary sea level forcing from four major constitutents ($M_2$, $S_2$, $K_1$, and $O_1$). Subsequently the established model was utilized to investigate the effect of construction of tidal barriers for Saemanguem development plan on the existing tidal regime. It has been shown that tide of semi-diurnal constituents may be reduced to 2-7 cm in amplitude along the frontal area of proposed barrier. In connection with above changes the tidal current regime may be subjected to significant reduction in intensity. thus suggesting the high possibility of sedimentation along the frontal region of tidal barrier.

• International Commerce and Information Review
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• v.15 no.3
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• pp.387-409
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• 2013

Since 1990s, more and more enterprises outsource the logistics to reduce the cost and improve core competence, which bring the prosperity of 3PL, industry in China. However, some data shows that the service quality of 3PL is not good enough, there is only a few companies that can provide systematic service, and the satisfaction of the customer is very low. Besides, many enterprises choose 3PL service provider mainly based on the price. Although there are many papers on the logistics service quality, they mainly research on single part, Studies on the relation between the service quality and the partnerships of outsourcing are scarce. Therefore, this study tries to research the service quality, partnership and the relationship between them in China's 3PL industry systematically. On the foundation of the service quality and partnership theories by former researchers, taking present situation of China's 3PL industry into consideration, this paper constructs service quality and the partnership evaluation system and develops LSQ-PP model to examine the relation between the service quality and partnership. and then use the Structural Equation Model (SEM) to analysis the full sample of collected questionnaires. Finally, the thesis summarizes the conclusion and offers suggestions for practice and future research.

• International Journal of Highway Engineering
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• v.13 no.2
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• pp.41-48
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• 2011

Warm-mix asphalt(WMA) technology has been developed to allow asphalt mixtures to be produced and compacted at a significantly lower temperature. The WMA technology was identified as one of means to lower emissions for $CO_2$ and has been spread so quickly in the world. Recently, two innovative WMA additives has been developed to reduce mixing and paving temperatures applied in asphalt paving process in Korea. Since the first public demonstration project in 2008, many WMA projects have successfully been constructed in national highways. In 2010, the WMA field trial was conducted on new national highway construction under Dae-Jeon Regional Construction Management Administration. The two different WMA loose mixtures(WMA and WMA-P) and a HMA mixture were collected at the asphalt plant to evaluate their mechanical performance in the laboratory. The Third-scale Model Mobile Loading Simulator(MMLS3) was adopted to evaluate rutting resistance and moisture damage under different traffic and environmental conditions. In this study, plant-produced WMA mixtures using two WMA additives along with the conventional hot mix asphalt(HMA) mixtures were evaluated with respect to their rutting resistance and moisture susceptibility using MMLS3. Based on the limited laboratory test results, plant-produced WMA mixtures are superior to HMA mixtures in rutting resistance and the moisture susceptibility. The WMA additive was effective for producing and compacting the mixture at $30^{\circ}C$ lower than the temperature for the HMA mixture.

• Microbiology and Biotechnology Letters
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• v.40 no.4
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• pp.389-395
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• 2012

T-RFLP (terminal restriction fragment length polymorphism) analysis, one of the most highly adopted culture-independent microbial community analysis methods, was applied to evaluate the colonization of probiotics in experimental animal gut. Lactic acid bacteria that exhibited cinnamoyl esterase activity were isolated from Korean fermented vegetables and identified by 16S ribosomal RNA sequence analysis. Lactobacillus plantarum KK3, which demonstrated high chlorogenic acid hydrolysis by cinnamoyl esterase activity, and acid/bile salt resistances, was cultured, freeze-dried, and fed to mice and the microbiota in their feces were monitored by T-RFLP analysis. The T-RF of L. plantarum was detected in the feces of mice after the start of administration and lasted at least 31 days after the initial 7 day feeding. T-RFLP analysis was considered a useful tool to evaluate the gut colonization of probiotic L. plantarum. In order to prove that L. plantarum was from viable cells, we reisolated L. plantarum in the feces using cinnamoyl esterase activity media as the screening step. The colonization of L. plantarum KK3 in the mouse gut was confirmed by this research.

• Journal of Korean Society of Transportation
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• v.35 no.6
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• pp.511-524
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• 2017

This study aims to evaluate the availability of ABM (Active-Based Model), FEATHERS, as a policy evaluation tool. To achieve the goal, scenario analysis on flexible working policy was conducted to measure its impact on activity-travel behavior. As a consequence, there seems no significant change in worker's daily life, other than mitigating traffic congestion due to decreasing commuting travel in the rush hour. The result of VKT (vehicle kilometers traveled) shows an opposite pattern according to given household/individual constraints. The scenario analysis on telecommuting indicates a decreasing trend in both travel frequency and distance because of the diminished number of commuting trips. As the activity space of telecommuters is shifted to a residential area, there are more short-distance trips by using non-motorized transport, which leads to decrease in VKT (using a private vehicle). Thus, the sensitivity of VKT by population groups varies due to transport mode shift (between personal and another mode) and growing non-work trips (using a private mode). This study found few things. First, it is necessary to evaluate the details of policy impact by population groups since it can be varied depending on household/individual characteristics. Second, the case study shows a promising performance of ABM as policy measurement that provides reality in policy evaluation. Third, ABM allows us to do more accurate analysis (i.e. time-series analysis by population groups) of policy assessment than those of FSM (Four-Step Model). Lastly, a further effort in data collection, literature review, and expert survey should be made to enhance the accuracy and confidence of future research.

• Journal of the Korean Society of Radiology
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• v.17 no.3
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• pp.449-457
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• 2023

Shielding for reducing exposure dose can make the diagnosis limited. The purpose of this study is to increase the efficiency of radiation protection and minimize the loss of image information by producing the shielding made of the water and the contrast medium which has different proportion and finding out the ideal proportion of them. Each shielding materials were made of water and water-soluble iodine contrast medium with the different proportion. The attenuation rate of absorbed dose was evaluated by the shielding materials in the plastic contents for measuring the efficiency of the radiation protection. As a result, the higher ratio of the contrast medium, the more efficient it is for radiation attenuation. The anatomical structure was observed most properly in case of the solution with 20 ml of the contrast medium and most difficultly in case of more than 60 ml of the contrast medium. In case of the signal intensity between skeleton and gas, the difference of average value had a significant as p < 0.001. Shielding with contrast medium attenuates less than the conventional shielding but in the examination for the sensitive part to radiation, it can be used to minimize the loss of the image information and reduce the exposure dose.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.95-95
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• 2012

우성 진공(크라이오 펌프), 제일 진공(터보 펌프)의 개발 시제품을 나노종합 팹센터(크라이오 펌프는 Sputter 장비, 터보 펌프는 Etcher 장비에 부착)에서 공정 신뢰성 Test 실시함.