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- 저자 : 백성현(Seonghyeon Baek) (검색결과 5 건)
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해상용 대형 가스터빈의 소음 저감을 위한 흡음형 소음기의 설계 및 성능 측정
백성현(Seonghyeon Baek),이강희(Kanghee Lee),권대훈(Daehun Gwon),이일재(Iljae Lee) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
Based on ISO 7235, an experimental setup to measure the acoustic performance of splitter type dissipative silencers are fabricated. The length of each duct, sound source, microphone locations, modal filter, and anechoic termination are considered in the design of this setup. The modal filter is a particularly important factor because it affects the limit of measurement, which is also determined by the amount of flanking transmission of sound generated by the sound source to microphones. The effects of absorptive materials, media which covers the materials, and the number of splitters on the noise reduction of the sample silencers are experimentally investigated. The insertions loss of silencers with media and higher number of splitters increases, especially at higher frequencies.
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해상용 가스터빈의 스플리터 소음기 성능에 대한 실험적 연구
백성현(Seonghyeon Baek),이강희(Kanghee Lee),강경식(Kyungsik Kang),이일재(Iljae Lee) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.7
Based on ISO 7235, an experimental setup to measure the acoustic performance of splitter type dissipative silencers was fabricated. The length of each duct, sound source, microphone locations, modal filter, and anechoic termination were considered in the design of this setup. The modal filter is a particularly important factor because it affects the limit of measurement. The effects of number of splitters, absorptive material density, perforate plate, and media on the noise reduction of the sample silencers were experimentally investigated. The experimental results show that the insertion loss of a silencer with media, high perforate opening, and higher number of splitters increases especially at higher frequencies.
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대형 스플리터 소음기 성능에 대한 3차원 수치해석적 연구
백성현(Seonghyeon Baek),이창헌(Changheon Lee),권대훈(Daehun Gwon),이일재(Iljae Lee) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.2
Acoustic performance of splitter silencers was investigated by using 3-dimensional commercial software and experiments. Flow resistivity of sound absorbing material was indirectly estimated by using an impedance tube setup and a curve fitting method. In addition the acoustic impedance of perforated plate was determined by an empirical formulation. Such properties have been used as input parameters in the commercial software. The prediction for a splitter silencer with 1000 ㎜ length was compared with the experimental result. The numerical method is then applied to identify the effects of number of splitters, length of splitters, absorptive material density, and porosity of a perforated plate on the performance of the splitter silencers. As the number and length of splitter increases, the acoustic performance significantly increases. Although the increase of density of absorptive material also increase the acoustic performance, a change in the density over a certain level hardly affect it. The increase of porosity will enhance the performance especially at higher frequencies.
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해상용 가스터빈의 흡음형 소음기 성능에 대한 3차원 해석적 연구
이창헌(Changheon Lee),백성현(Seonghyeon Baek),권대훈(Baek, Daehun Gwon),이일재(Iljae Lee) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.10
Acoustic behavior of dissipative silencers with splitters was analyzed by using 3-dimensional commercial software. An impedance tube setup was used to obtain the flow resistivity of mineral wool. The resistivity is used as an input parameter for the calculation of insertion loss of silencers. The comparison of insertion loss predictions with the experimental results shows reasonable agreements. For large silencers, it needs a large number of elements especially at high frequencies and thus long computation time. To reduce computation time without sacrifice of accuracy, predictions for various partial models were presented. Partial model can be used as a representation of the full model with relatively short computation time. It can be concluded from more predictions with different flow resistivity that lower flow resistivity may decrease the insertion loss, but higher resistivity slightly improves it.
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백성현, 김수균, 안성옥 배재대학교 공학연구소 2019 공학논문집 Vol.21 No.1
Whatever the game is, the developer must make the player enjoy playing the game. To do so, we have to make a lot of game elements, such as manipulation, hitting, and story, which today's developers develop, not focusing on, but simply on sales. Therefore, I will develop a story-based RPG game this time. The plan will be based on system map implementation, UI implementation and character implementation, and the schematics will be based on game start-title-intro, and physical game start order. The system map implementation simply creates a god that is as empty as the number of new games envisioned. Since the number of gods envisioned is three, if only three are created, it's over. Second is UI. UI produces inventory, store, quest, and dungeon entry windows to give players convenience and finally ends development by creating characters and enemies. Today, games that are just on the game market are busy getting rid of the story and taking care of the elements of other games to achieve top sales. Story is also an important element of the game. Therefore, this time, we have developed a story-based RPG game. 어떤 게임이든 간에 개발자는 플레이어가 게임을 플레이하면서 즐거움을 느끼게 해야 한다. 그러기 위해서는 게임의 요소 중 조작감, 타격감, 스토리 등 수많은 게임의 요소를 고려하며 만들어야 하는데 오늘날의 개발자들은 그런 것을 중요시하지 않고 그저 매출만 중요시하며 개발한다. 그렇기에 이번엔 스토리를 기반으로 하는 RPG 게임을 개발하겠다. 계획은 시스템 맵 구현, UI 구현, 캐릭터 구현 순으로 진행하고 구상도는 게임 시작-타이틀-인트로-본격적인 게임 시작 순으로 하겠다. 시스템 맵 구현은 그저 구상한 게임의 신 개수만큼 비어있는 신을 만들면 된다. 구상한 신의 개수는 3개이므로 3개만 생성하면 끝. 두 번째로 UI이다. UI에서는 인벤토리, 상점, 퀘스트, 던전 입장 창을 제작하여 플레이어가 편의를 부여해주고 마지막으로 캐릭터와 적을 제작함으로써 개발을 끝낸다. 오늘날은 그저 게임 시장에 올라오는 게임들은 최고 매출을 달성하기 위해 스토리는 버리고 다른 게임의 요소를 챙기기에 바쁘다. 스토리 또한 게임의 중요한 요소임에도 불구하고 말이다. 그렇기에 이번에는 스토리를 기반으로 하는 RPG 게임을 개발해봤다.
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