• Journal of Science and Technology Studies
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• v.11 no.2
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• pp.1-30
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• 2011

This paper analyzes system builders and their human networks of the Korean online game industry. By the early 2000s, Korea became one of the major online gaming countries in the world. In this period, important factors included the existence of system builders and their solid human networks. The few innovators who assisted the breakthrough of the development of the online gaming industry formed a human network in universities and IT companies. They shared innovations in information and collectively learned the conventions of the industry. In their achievement, the human networks which had already fully formed in the late 1990s became more noticeable. This paper, with its historical approach, will complement the limits shown by existing researches that, in their effort to find the causes for the success of the Korean online game industry, focus rather narrowly on the conditions of the period during which online games were becoming popular.

• The Journal of the Korea Contents Association
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• v.12 no.2
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• pp.208-221
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• 2012

The purpose of this study is to investigate the antecedent variables of customer citizenship behavior selected by a social exchange point of view on the Boryeong Mud Festival. Of all the questionnaires collected, 239 were included in the analysis which was performed using SPSS. Date analysis method used to frequency analysis, factor analysis, reliability analysis and canonical correlation analysis. As the results of the canonical correlation analysis between the customer citizenship behavior and the social exchange point of view, there was a significant relationship between the attributes of customer citizenship behavior - loyalty, cooperation, Participation and social exchange point of view - customer satisfaction, customer confidence, perceived support of customers, justice perception. Therefore, marketing practitioner should recognize the importance of customer's perception in the service circumstance and make a managerial effort to offer the best service to customer. The result of this paper may help local festival planner and marketers for festival marketing strategy.

• Plant Journal
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• v.18 no.2
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• pp.41-45
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• 2022

The conventional communication method using mud flow pressure waves has a speed of 1-2 bps, so it takes a long time to communicate, making real-time control impossible. Although the sound wave communication method for improving the communication speed by 10 times or more has been commercialized, its use is limited due to its high price and there are not many application cases. In this study, the simulator corresponding to the facility was developed to develop performance similar to the actual test results. For simulating sound wave communication through a drill pipe, we proposed a governing equation that can simulate friction damping by mud and developed a numerical analysis model. The attenuation factor was corrected by comparing it with the attenuation rate of sound wave energy at the drilling site. The developed numerical analysis model was applied to the QPSK modulation type communication algorithm to confirm the excellent performance of the communication error rate of 0.04% in the ground. This is the communication performance under the condition that noise has not been mixed yet, and in order to apply it, the technology of reproducing the actual noise signal for mixing by securing the field noise data was established.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.2C
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• pp.125-131
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• 2008

Ground stiffness(shear wave velocity) is one of the key parameters in geotechnical earthquake engineering. An In-situ seismic technique has its own advantages and disadvantages over the others in stiffness measurements. By combining the crosshole and seismic cone techniques and utilizing favourable features of bender elements, a new hybrid probe has been developed in order to enhance data quality and easiness of testing. The basic structure of the probe, called "MudFork" is a fork composed of two blades, on each of which source and receiver bender elements were mounted respectively. To evaluate the disturbance caused by the penetration of the probe, shear wave velocity measurements were carried out in the Kaolinite slurry in the laboratory. Finally, the probe was penetrated in coastal mud near Incheon, Korea, using SPT(standard penetration test)rods pushed with a routine boring machine and shear wave velocity measurements were carried out. The results were verified with data from laboratory and cone testing. The performance of the probe turns out to be excellent in terms of data quality and testing convenience.

• Proceedings of the IEEK Conference
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• 2003.07d
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• pp.1697-1700
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• 2003

The multi-user online game is a typical example of networked graphic applications. Increasing the reality of such a game requires the minimization of problems due to the network delay. In this paper, we propose a game architecture that reduces the network delay needed for message transfer, and a method for synchronization of game states in clients . The proposed game architecture is region proxy-based, and it can require a less network delay than a conventional client-server style that is usually used in commercial games. In our synchronization method, messages are processed in a batch-mode style and the number of rollbacks needed for synchronization significantly decreases. Our experiment shows that our method provides better performance than previous TSS (Trailing State Synchronization).

• Journal of Ocean Engineering and Technology
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• v.28 no.4
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• pp.280-287
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• 2014

In this paper, the numerical simulation of the gas-liquid flow in a cylinder cyclone separator is performed to investigate the flow characteristics using a commercial software, FLUENT, which solves the Reynolds-averaged Navier-Stokes(RaNS) equations. First, a single-phase flow with water in a gas-liquid cylinder cyclone(GLCC) separator is simulated and compared with the experiments(Farchi, 1990) and numerical simulations(Erdal, 1997). Then, the characteristics of the multi-phase flow for water-air, mud-only, and mud-air cases are discussed in the view point of the feasibilities for a mud handling system.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2007.05a
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• pp.469-472
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• 2007

Aeroacoustic sound induced from inter-couch spacing is an important contributor to interior noise generation for high speed trains. Especially the open space between mud-flap has significant impact from flow-structure interactions. To understand noise generation mechanism, experiments were performed using the wind tunnel. To find mud-flap parameters for minimal noise generations the various shape of the mud-flap was installed and its effects on the wall-pressure generation were investigated.

• 월간 기계설비
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• s.288
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• pp.62-74
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• 2014

가족끼리 놀러 가기로 했다. 한 아이는 수족관, 다른 아이는 동물원을 가자고 조른다. 부모는 어느 쪽으로 선택해야 할지 난감하다. 이럴 때 수족관과 동물원이 한 공간에 있다면 얼마나 좋을까? 이런 부모들의 마음을 헤아려 수족관과 동물원을 한 공간에 마련한 아쿠아리움이 있다. 지난 4월에 개장한 '한화 아쿠아플라넷 일산'이다. 아쿠아플라넷 일산은 국내에서 해양생물을 관람할 수 있는 63씨월드, 코엑스 아쿠아리움, 제주, 여수에 이어 다섯 번째지만 동물원과 수족관이 결합된 단일시설로는 국내 최초이며, 수도권 최대 규모의 아쿠아리움이다. 해양생물을 관람하려면 서울로 와야 하는 수도권 이북지역의 관람객을 겨냥했으며 호수공원, 국제전시단지, 한류월드로 이어지는 매머드급 접객시설이 밀집되어 있고 일산 킨텍스, 주엽역과 일산 꽃박람회장까지 연결되는 접근성이 뛰어나 전시단지의 상징적인 랜드마크로서 자리잡을 전망이다.

• Proceedings of the Korea Multimedia Society Conference
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• 2001.06a
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• pp.564-569
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• 2001

본 논문은 기존의 3D게임엔진에 실시간으로 상호작용이 가능하고 3D MMORPG(Massive Multi-play Outline Role Playing Game) 게임에 적합한 가상공간을 표현하기 위한 필요한 기술을 분석하고 이를 활용하려 한다. 기존의 머드 게임에 3차원 기술적용하고, 3차원 물체를 모델링하는데 있어서 메쉬나 버텍스, 혹은 폴리곤으로 사실적인 지형처리와 렌드링 속도향상을 위하여 3차원 개체의 폴리곤을 동적으로 생성시키기 위한 방법으로 Height field처리 기법과 거리에 따라 다르게 모델링된 데이터를 선택적으로 사용하는 LOD(Level of Detail)처리기법과 가시성 판단이나 충돌 검출을 위한 입체 컬링 방법으로 옥트리를 이용하여 가상공간을 분해 하기 위한 자료 구조로 사용한다. 본 논문은 기존의 3차원 공간을 표현하기 위하여 사용되고 있는 옥트리 구조를 이용하여 공간을 분할하고, 이를 세부수준으로 나누어 처리하기 위한 LOD 개념을 이용하여 외부지형을 폴리곤으로 표현하는 방법에 대한 처리 기법을 제시하려고 한다.

• Proceedings of the Korea Concrete Institute Conference
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• 2008.11a
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• pp.585-588
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• 2008

This study investigated fundamental properties of the colored concrete Corresponding to the various temperatures for plasticity and additive volume of the redmud. the results were summarized as following. There was no difference on the air contents and slumpflow at each temperatures for plasticity. The color tone was high in accordance with increase of temperatures for plasticity, but the drying shrinkage length change was shown in the opposite tendency. The slumpflow was gradually declined, but the air content, compressive strength, color ton and drying shrinkage length change were overall increased when the additive volume of the redmud was increased.