• 한국정밀공학회지
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• 제30권3호
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• pp.317-323
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• 2013

In-mold coating is a reactive fluid designed to improve the surface quality of injection molded thermoplastic substrate in functional and cosmetic properties. In this study, a mixing head for in-mold coating was designed, and mixing characteristics of two-component polyurethane flowing through runner were investigated based on flow simulations. In order to achieve uniform mixing of two components injected through straight mixing head, an impingement aftermixer was used in runner design. Semi-circular cross-section was better than circular one for runners for uniform mixing. With increasing runner length and flow rate, mixing became more uniform. In addition, the degree of mixing was more improved with decreasing viscosity of isocyanate.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2011년 춘계학술대회논문집
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• pp.561-566
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• 2011

In this paper, 1-D design of axial flow hydraulic turbine including runner blades, spiral casing with distributors(guide vanes and stay vane), and draft tube was conducted and then 3-D flow analysis was carried out using CFX-12.1. The results of 3 runners showed that with an increase in the number of blades, the flow rate and the power of the turbine system increased. On the other hand. the runner loss was not directly connected with the number of blades. As a result, proper blade number could be selected and more than 100kW small hydraulic turbine could be designed.

• International Journal of Fluid Machinery and Systems
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• 제2권4호
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• pp.400-408
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• 2009

Optimization of seal geometries can reduce significantly the energetic losses in a hydraulic seal [1], especially for high head runner turbine. In the optimization process, a reliable prediction of the losses is needed and CFD is often used. This paper presents numerical experiments to determine an adequate CFD model for straight, labyrinth and stepped hydraulic seals used in Francis runners. The computation is performed with a finite volume commercial CFD code with a RANS low Reynolds turbulence model. As numerical computations in small radial clearances of hydraulic seals are not often encountered in the literature, the numerical results are validated with experimental data on straight seals and labyrinth seals. As the validation is satisfactory enough, geometrical optimization of hydraulic seals using CFD will be studied in future works.

• 말소리와 음성과학
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• 제4권1호
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• pp.55-65
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• 2012

In this study, the prosodic disambiguation of the syntactic attachment differences was investigated in relation to the effect of lexical bias. Speech materials were composed of N1-conj-N2-PP phrases such as "walkers and runners with dogs." The results show that the use of durational pattern is dominant over the pitch pattern to differentiate the attachment differences. The characteristic pitch contour was the rise and fall over N1 and N2 in the high attachment. The pitch contour in the low attachment was the rise and fall over N2 and N3 although the frequency of such patterns was lower for the low attachment case. For the durational pattern, the lengthening in the N2 region plays a significant role in the disambiguation of the syntactic attachments. The interaction between the lexical bias and the syntactic attachment was not statistically significant in the duration data.

• International Journal of Fluid Machinery and Systems
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• 제3권4호
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• pp.301-308
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• 2010

Quest for reliability of hydraulic runners is a concern for all mature electricity producers. The fatigue damage caused by dynamics loads is frequently the root cause of runner failure. This paper presents the damage tolerance approach based on fracture mechanics as the method chosen by Alstom and Hydro-Qu$\acute{e}$bec to predict effects of damage on runner lifetime and consequently to be use as a design method. This is sustained by a research on fracture mechanics properties of runner materials and by recommendations on the strategy to define a safety margin for design. The acquired knowledge permits to identify potential improvement of the runner lifetime without significant cost increase, like being more specific on some chemical composition or heat treatment.

• 한국유체기계학회 논문집
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• 제14권3호
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• pp.18-22
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• 2011

This paper presents the transient performance analysis of a micro-hydro Pelton turbine for the osmotic power generation using the commercially available computational fluid dynamics (CFD) code, ANSYS CFX. The detailed flow field in the micro Pelton turbine with a single-jet is investigated by the CFD code adopted in the present study. Predicted characteristic curves agree fairly well with measured data for a prototype Pelton turbine over the normal operating conditions. The computational analysis method presented herein can be effectively applied to the hydraulic design optimization process of general purpose Pelton turbine runners.

• 한국정보통신학회논문지
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• 제24권2호
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• pp.337-339
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• 2020

Speed-run is a gameplay style in what the player tries to finish the game as quickly as possible. The purpose of this study is to observe and analyze the difference between a normal player and a speed runner in a speed run to better understand their interaction with the game and to extrapolate the applications of the analyzed frameworks to scenarios that extent normal gameplay. For this purpose, MDA (Mechanic, Dynamic, Aesthetics) and DPE (Experience, Design, Play) were used. As a result, the average player was found to focus on aesthetics or affects while the speed runner focused on mechanics and gameplay.

• 한국응용곤충학회지
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• 제47권1호
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• pp.101-105
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• 2008

딸기잎선충의 피해를 방지하기 위하여, 딸기잎선충에 감염된 딸기 모주를 정식 직전에 살선충제에 침지 처리하여 토양에 정식하고 이들로부터 발생되는 자묘의 딸기잎선충 감염 정도를 조사하였다. 처리는 살선충제 ethoprophos 5% 입제와 fosthiazate 5% 입제를 토양(3 Kg a.i./ha), 살선충제-냉탕침법(2.5 g a.i./liter, $20^{\circ}C$), 살선충제-온탕침 법(2.5 g a.i./liter, $46^{\circ}C$)으로 각각 처리하였으며, 그 효과를 무처 리, (무농약)온탕침법 및 diazinon 34% 유제(3.4 g a.i./liter) 엽면처리와 상호 비교하였다. 정식 100일후 조사시, fosthiazate-냉탕액 침지 처리구의 자묘는 무처리에 비하여 감염률은 90% 낮고, 선충밀도는 98% 감소되어 가장 방제효율이 높았다. Fosthlazate-냉탕액 침지 처리구의 자묘의 수와 무게도 무처리에 비하여 거의 2배 많았다. 살선충제 2종중에서는 fosthiazate가 ethoprophos보다 방제 효과가 좋았다. Diazinon 엽면 살포 처리와 기존의 온탕침법은 정식 초기에만 딸기잎선충 밀도 억제 효과를 보였다. 딸기 모주 살선충제 침지법은 방제 효율이 높고, 딸기 생산은 모주에서 발생된 자묘를 이용하여 다음해에 이루어짐으로 농약 잔류의 위험도 없다.

• 원예과학기술지
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• 제17권2호
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• pp.111-114
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• 1999

국내재배에 적합한 딸기 품종을 선발하고자 7가지 품종을 공시하여 자묘발생 특성과 생육 및 과실의 수량과 품질등을 검토해 본 결과 자묘 발생은 여봉, 아키히메, 수홍이 비교적 많은 양의 자묘를 생산할 수 있었고, 아까네꼬, 도치노미네는 런너가 굵고 충실한 자묘를 얻을 수 있었으나 생산량은 적은 편이었다. 자묘간의 묘소질은 촉성용 품종에서 더 균일함을 보였고, 자묘의 뿌리 발근력은 모든 품종에서 발근이 잘 되었으며 특히 도치노미네, 아까네꼬 품종이 타품종보다 우수하였다. 품종간 생육특성을 보면 촉성재배에서는 여봉에 비해 아키히메가 초세가 왕성하고 개화기가 5일 정도 빠르며 수량이 많고 당도가 높았지만 경도가 낮았다. 반촉성 재배에서는 도치노미네 품종이 생육이 왕성하고 경도와 당도가 높으며 평균 과중과 수량이 많았다. 그러나 화방당 화수가 적고 2화방 출현이 늦었다. 아까네꼬는 당산비가 가장 높았고 향기가 있었으나 경도가 낮아 전조처리 등으로 조기수확할 필요가 있다고 생각된다.

• Journal of Information Technology Applications and Management
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• 제26권4호
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• pp.51-69
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• 2019

One of the most considerate phenomena of the era of the Fourth Industrial Revolution is the use of digital devices. Digitalization is rapidly advancing through all areas of industry and life. Customer journey with digitalization is looking totally different from previous customer journey. The research targets were users of fashion, automobiles, cosmetics and online shopping malls. We analyzed 300 people for each valid questionnaire. The results of the study are as follows. First, it has been proven that digital experience affects positive (+) impact on purchasing intention and positive (+) impact on recommending intention and negative impact (-) on switching intent and subsequently affects positive impact (+) to purchase and incase of switching intent, negative impact (-) to purchase. Unlike traditional methods such as SPC(Service Profit Chain), the Digital experience to Purchase process Chain (DPC) has been identified to be suitable in the digital age. Second, the digital satisfied group (5 score-very satisfaction) has shown same result as above. However the digital neutral group (even though 4 score- satisfaction in five-point scale), specially in a highly competitive industry, has different from the satisfied group and 3 score-normal is same as dissatisfied group. It means that this group is that If there is a high level of attractiveness of substitute goods, there is a high possibility of switching them. It has supported Jones and Sasser [1995] that there have been two types of loyalty of true long-term loyalty and what we call false loyalty in the highly competitive industry zone which is commoditization or low differentiation, many substitutes, low cost of switching. Identifying true loyalty and false loyalty is crucial to establishing a customer experience strategy. it is necessary to actively utilize long-term digital experiences strategy to increase the total satisfaction of digital experience through all of customer purchasing journey in order to enhance the digital customer experience. It is difficult to see the effect as a one-time event. It should be scaled over the entire customer purchase process over a long period of time, which can positively affect purchase intention, recommendation intention, and conversion intention. This is also why it is difficult for second-runners to overtake first-runners in a short period.