Nowadays meteorological information is systemized as a useful knowledge which has a significant effect on the overall industrial domains over the simple data. The distribution industry, which has the short life cycle, depends on the meteorological information at the strategic level. However, it is necessary to pay attention to the continuous investment in meteorological information because there is a hostility to paying for a service, particularly it does not provide accurate and reliable information. Therefore, the purpose of this study is to increase the usefulness of meteorological information in the distribution industry for its economic effectiveness from the core meteorological factors. We found significant meteorological factors (temperature, precipitation, disaster) that have a critical influence on the distribution industry through the hierarchical analysis process, and their importance according to the type of distribution channels, such as department store, large-scale discount store, convenience store, and home shopping. We performed the AHP analysis with 103 survey samples by middle managers from the various distribution channels. We found that precipitation is the critical meteorological factor across the distribution industry. Based on this result, we stress the difference in the level of the meteorological information in order for the effectiveness of each type of distribution channels.

실시간 전략 시뮬레이션(Real-Time Strategy, RTS)에서는 게임 유저가 내리는 명령이 빠른 시간 안에 게임에 반영되어야 하며, 그 명령은 여러 객체에게 전달될 수도 있으며, 게임에 참여한 모든 게임 유저가 같은 진행상황을 유지하며 게임이 진행되어야한다. 그러나 네트워크 기반게임에서 다른 게임 유저에게 그 명령을 전달하기까지는 일정시간이 소요되며, 짧은 시간 안에 많은 명령에 대한 동기화는 실시간 전략 시뮬레이션 게임서버의 중요한 요소가 된다. 따라서 본 논문에서는 실시간 전략 시뮬레이션 게임에서의 효율적인 동기화를 위한 이벤트 잠금 기법을 기반으로 한 새로운 기법을 제안하고, 이를 적용한 전략 시뮬레이션 게임서버 및 클라이언트를 구현하였으며, 여러 클라이언트들과의 게임 실행을 통한 테스트를 통해 제안 기법의 효용성과 신뢰성을 보였다.

The pressure drop through pulse air jet-type bag filter is one of the most important factors on the operating cost of bagfilter houses. In this study, the pilot-scale pulse air jet-type bag filter with about 6 ㎡ filtration area was designed and tested for investigating the effects of the four operating conditions on the total pressure drop, using the coke dust collected from a steel mill factory. When the face velocity is higher than 2 m/min, it is not applicable to on-spot due to the increase of power expenses resulting from a high-pressure drop, and thus, 1.5 m/min is considered to be reasonable. The regression analysis results show that the degree of effects of independent parameters is a order of face velocity > concentration > time > pressure. The results of SPSS answer tree analysis also reveal that the operation time affects the pressure drop greatly in case of 1 m/min of face velocity, while the inlet concentration affects the pressure drop in case of face velocity more than 1.5 m/min.

Ultrasound and Surfactant aided soil washing process has been shown to be an effective method to remove diesel from soils. The use of surfactants can improve the mobility of diesel in soil-water systems by increasing solubility of adsorbed diesel into surfactant micelles. However, a large amount of surfactant is required for treatment. In addition, synthetic surfactants, specially anionic, are more toxic and the surfactant wastewater is hard to treat by conventional wastewater treatments even by AOPs. Ultrasound improves desorption of the diesel adsorbed on to soil. The mechanisms are based on physical breakage of bonds by hot spot, directly impact onto soil particle surface, the fragmentation of long-chain hydrocarbons by micro-jet and microstreaming in the soil pores. The use of ultrasound as an enhancement method in both anionic and nonionic surfactant aided soil-washing processes were studied. And all experiments were examined proceeded under CMC surfactant concentration, frequency 35 khz, power 400 W, Soil-water ratio 1:3(wt%), particle size 0.24 ~ 2mm and initial diesel concentration. 20,000 mg/kg. Combination with ultrasound showed significant enhancements on all the processes. Especially, nonionic surfactant Triton-X100 with ultrasound showed remarkable enhancements and diesel removal rate enhanced by ultrasound helps desorpting of surfactant adsorbed onto soils which prevented decreasing surfactant activity.

This paper proposes a path planning method of a mobile robot in two-dimensional work space. The path planning method is based on a cell decomposition approach. To create a path which consists of a number of line segments, the Delaunay Triangulation algorithm is used. Using the cells produced by the Delaunay Triangulation algorithm, a mesh generation algorithm connects the starting position to the goal position. Dijkstra algorithm is used to find the shortest distance path. Greedy algorithm optimizes the path by deleting the path segments which detours without collision with obstacles.

This study tried to investigate and analyze the actual state such as the regional, classified, and material characteristics of the water quality in order to research the several factors by which the filtrated water of the total 250 cases can be polluted in the water tank. The 215 points (86%) clean the water tanks twice a year regularly and J-city has done the best job of cleaning the water tanks. The fifty points (20%) of the total 250 investigation points examine the water quality of the water tanks every year, however, the 175 investigation points (70%) do not execute the inspection of water quality. In the case of the regional characteristics in the water quality, the 23 points (46%) in H-county, the 17 points (34%) in S-county, and the 16 points (32%) in G-city are incongruent in the standard, and the incongruity ratio of the water quality in J-city is the lowest. The result of the classified incongruity shows that total coliforms were found at the 61 investigation points, mesophilic bacteria were found at the 27 points, and turbidity was found at the 12 points. In the case of the material incongruity, concrete was found at the 63 investigation points as the most distinguished factor, and FRP (fiberglass reinforced plastic) at the 23 points, SMC (sheet molding compound) at the 12 points, and stainless steel was found at the 2 points.

본 연구는 립선별기에서 미숙립 선별능력을 높임으로써 도정효율 증진과 완전미율 향상을 꾀하고자 품종특성을 고려한 립선별기 선별체 최적 조건 구명 시험이 수행되었고, 다음과 같은 결과가 얻어졌다. 1. 립선별기의 선별능력은 현미립 두께에 절대적으로 의존되었는데, 조사된 시험재료의 현미 평균 두께는 1.79(농안)-2.16 mm(대립벼1호)의 분포를 보였다. 2. 품종별 차이는 있었으나, 대체적으로 현미의 평균 립두께가 2.08 mm이상일 경우 1.9 mm 선별체, 2.00-2.08 mm 범위일 경우 1.8 mm 선별체, 1.90-2.00 mm 범위일 경우 1.7mm 선별체, 그 이하일 경우 1.7 mm 이하의 선별체가 정립 손실을 최소화하면서(0.1%이내) 완전미율을 향상시킬 수 있는 조건인 것으로 판단되었다. 3. 백미 품위에 미치는 선별체 분리효과는 미숙립 비율이 높은 품종일수록 크게 발휘되었다. 4. 현미선별 체 눈 크기를 0.1 mm씩 증가시킬 경우 품종별로 현미선벌체 통과물중에 정상립이 포함되어 발생되는 정상립 손실율이 0.5% 수준까지는 현미선별체 눈금크기 증가에 따라 미미하게 증가하였으나, 이 눈금 수준이상에서는 선별체 눈금 0.1 mm 증가에 따라 정상립의 손실율이 급격히 증가하는 것으로 보아 정상립 손실율 0.5% 수준의 눈금이나 그 보다 0.05~0.10 mm 아래 눈금의 선별체가 적당할 것으로 생각되었다.