• The KSFM Journal of Fluid Machinery
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• v.20 no.2
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• pp.32-40
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• 2017

In this study, an in-house program to analyze the performance degradation for gas turbines is developed using MATLAB and is validated using commercial software. This program consists of design and off-design calculations. The results of design calculation is used for reference values of off-design calculation. The off-design calculation is composed of measured and expected performance analyses, and turbine inlet temperature correction. In general, performance degradation is analyzed by comparing the results of measured and expected performance analysis. However, if gas turbine performance degrades, turbine inlet temperature might increase due to the general control logic to comply with the power demand. Therefore, it is required to consider the deviation of turbine inlet temperature from the normal value in the performance diagnosis to analyze the performance degradation exactly. In this study, a special effort is given to the correction of turbine inlet temperature. The accuracy of the developed program is confirmed by comparison with commercial software, and its capability of performance diagnosis using the turbine inlet temperature correction is demonstrated.

• Journal of Korea Game Society
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• v.16 no.4
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• pp.105-114
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• 2016

This study analyzed a total of 1,025 quests in the 'Warlords of Draenor' which is the fifth expansion set to the massively multiplayer online role-playing game (MMORPG) World of Warcraft, by dividing them into violent and nonviolent quests. There was a total of 515 nonviolent quests which can be categorized into 46 types and a total of 510 violent quests that can be categorized into 7 types. The balance between violent and nonviolent quests shows that the game makers limited the number of adverse factors that can cause the players to be excessively absorbed in the game while successfully incorporating factors that can have positive effect on game players.

• Journal of Korea Game Society
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• v.16 no.1
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• pp.73-82
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• 2016

With a rapid development of smart devices, the consumption of digital media contents has become much faster. As a result, there has been a rising demand for diverse stories, and cultural archetypes have been reproduced to crate these stories. An archetype is an act inherent in collective unconsciousness. Since it is a prototype stemming from imagination and experiences, the distortion or deterioration of the archetype could even threaten the identity of national tradition. This study analyzed western contents which have been successful and domestic ones that have failed in the reproduction of their archetype, investigated aspects in the reproduction of cultural archetypes and reviewed future storytelling methodology.

• Journal of Korea Game Society
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• v.14 no.5
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• pp.183-192
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• 2014

In recent times, a trend has emerged which rejects negative elements such as violence and gambling associated with games, and emphasizes positive functions such as academic study, which is a desirable phenomenon. Serious games have great potential and unlimited boundaries in their scope, and need much study and research from various perspectives. Especially today, in enhancing the national image of Korea with "Korean games" for the next generation, creative storytelling is urgently required. In this study, I aim to investigate the functions and roles of serious games and to foresee their future direction of development. I also examine the essential elements of storytelling in games suitable for the next generation.

• Journal of Korea Game Society
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• v.17 no.4
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• pp.169-178
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• 2017

In order for the game industry to grasp the initiative of the global industry, it is time to positively need storytelling that can move the emotions of gamers over graphical appearance. Also, in the era of the 4th industrial revolution where the point of contact between virtual and reality spreads widely, it seems that the game character industry will rapidly emerge. Therefore, the author recognizes the importance of the character industry in the future, and based on the accumulated game research, he has identified 10 elements necessary for character storytelling. The ten elements are as follows. Design of life, design of race, design of occupation, design of PC and NPC, design of monster, design of personality, design of conflict, design of protagonist, design of external image, design of birth and death.

• The Journal of the Korean dental association
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• v.53 no.8
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• pp.545-557
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• 2015

The modified ridge splitting/expansion technique combined with guided bone regeneration (GBR) for implant surgery is used to expand the narrow and atrophied edentulous alveolar ridge. Also, the simultaneous implant placement after ridge splitting/expansion technique can reduce the treatment and healing time. This case report includes three patients with a narrow edentulous alveolar ridge of the 2 to 4mm. All three patients underwent a fracture of thin buccal cortical bone plate, and these defects were corrected by the use of the guided bone regeneration (GBR). After 7 to 18 months, all surgical area was stable, and all implant showed a good healing state on the clinical and radiographic examination. In conclusion, though this surgical method is technique sensitive, the modified ridge splitting/expansion technique combined with GBR for implant surgery is recommended for a horizontal augmentation in the narrow edentulous alveolar ridge.

• Journal of Korean Association for Spatial Structures
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• v.12 no.1
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• pp.43-50
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• 2012

Recently, due to the advanced computer technology, momental architectures have been designed and built using features that are very sophisticated. People's interest in free-form structural system has increased steadily not only nationwide, but also worldwide. However, there were many difficulties in the materialization of free-form structural system owing to the lack of technique and research. To solve this problem, this study performs the interface between the 3D modeling program and the optimization program. In the 3D modeling program, it is possible to automatic mesh generation and immediately to information extraction. It performs the shape optimization. Consequently, this research designs the example model and performs optimization in order to verify the developed interface module.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.7A
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• pp.943-950
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• 2000

In this paper, an asynchronous multi-rate optical wireless pulse position modulation-code division multiple access (PPM-CDMA) is proposed for an indoor non-directed diffuse channel. As a signature sequence for CDMA, an optical orthogonal code (OOC) is used and an interference cancellation scheme is applied to improve the bit error rate. It is known that the optical PPM-CDMA has advantages due to its power efficiency. Moreover, it provides multi-rate services by varying the modulation level with fixed pulse duration. In the proposed multi-rate PPM-CDMA system with fixed pulse duration, chip rate and sampling time do not change for each transmission rate and this simplifies overall system structure.

• Proceedings of the KIEE Conference
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• 2006.10a
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• pp.26-27
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• 2006

구리와 강철의 성질을 혼합한 것과 같은 우수한 성질을 갖고 있어서 열전도율이 좋고 내마모성이 뛰어난 베릴륨동 기판(BeCu foil)에 대한 식각 특성에 관하여 연구하였다. 일반적으로 베결륨구리에 대한 식각용액은 염화제이철($FeCl_3$)이 널리 알려져 있으며, 이 용액은 농도와 온도에 따라 식각시간이 달라지게 되어 식각되는 면의 상태가 영향을 받게 된다. 염화제이철의 농도를 변화시켜 본 결과 염화제이철의 농도가 증가할수록 식각률이 증가하였고, 염화제이철에 염산(HCI)을 첨가한 결과 식각률이 증가함을 알 수 있었다. 이는 염화제이철의 성분 중에서 염산(HCl)의 농도가 식각률에 영향을 미치고 있음을 나타낸다. 또한 염화제이철의 온도가 $40^{\circ}C$일때 식각률이 가장 우수하며 식각되는 면의 상태가 매우 양호해지고 각각 되는 면의 각도도 수직에 가까워진다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.44 no.5
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• pp.85-91
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• 2007

In this paper, we introduce the amplify-and-forward (AF) cooperative diversity with multiple relays using phase feedback. Simulation results show that the AF cooperative diversity with multiple relays using phase feedback not only provide the better performance than the direct transmission, but also obtain the diversity gain according to the number of the cooperating terminals. The performance of proposed scheme using tolerable feedback is close to optimal performance.