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Rene 80/B/Rene 80 액상 확산접합부의 기계적 성질
정재필,강춘식 대한용접접합학회 1995 대한용접·접합학회지 Vol.13 No.3
Rene80 superalloy was liquid phase diffusion bonded by using pure boron (B) as an insert material. As a basic study for the possibility of practical application of this bonding method, hardness and high temperature tensile strength of the bonded joint and metallurgical analysis were investigated. As experimental results, hardness of the bonded joint was homogenized after bonding and the tensile strength at 1144K was obtained to 90% of that of base metal. But there were some problems to be improved also, that means the joint was hardened after bonding due to increase of B content and elongation was much lower than that of base metal. Flat area and (Mo, Cr, W) boride, which should be harmful for bonding strength, were observed on the fractured surface of the tensile tested specimen.
<알라딘> 애니메이션과 실사영화 캐릭터 젠더표현 변화에 관한 연구 : 에니어그램을 중심으로
정재필 한국콘텐츠학회 2022 한국콘텐츠학회논문지 Vol.22 No.7
This study investigates trends and changes in gender expression in film and animation. It compares how gender, race, and class discrimination that was socially and culturally expressed differently in past and modern media contents. Indiscriminate content appreciation by the "digital native" generation is likely to unconsciously create false stereotypes. In this study, 「Aladdin」(1992) and 「Aladdin」(2019) were analyzed. This study looks at in the characters have changed since the original, which was a 2D animation in 1992, was re-released as a live-action film in 2019. For character analysis, we compare and analyze major characters and find out the differences based on the nine personality types of Enneagram, which define human personality types. As a result, Princess Jasmine's character change was remarkable. In the past, Disney animations had the majority of patriarchal and male-dependent princess characters, but now Disney is aiming for self-directed and independent female characters. Also, scenes that could instill stereotypes of gender, race, and class were changed. Disney's change can be seen as expressing the gender image that the public wants. Analysis of the change in character's personality in these works can be a useful methodology for creating attractive characters for the public. 이 연구는 영화, 애니메이션에서 젠더표현에 대한 시대의 흐름과 변화를 살펴보고 있다. 사회적, 문화적으로 있었던 성별, 인종, 계급의 차별이 과거와 현대의 작품에서 어떻게 다르게 표현되었는지 비교한다. ‘디지털 네이티브’ 세대의 무분별한 콘텐츠 감상은 잘못된 고정관념을 무의식적으로 만들어 주기 쉽다. 본 연구에서는 「알라딘」(1992)와「알라딘」(2019)를 분석하였다. 1992년 2D 애니메이션이었던 원작을 2019년에 실사화 재개봉하면서 캐릭터들이 어떻게 변화되었는지 알아본다. 캐릭터 분석을 위해 인간의 성격 유형을 규정하고 있는 에니어그램의 9가지 성격 유형을 토대로 주요 캐릭터들을 비교 분석하고 차이점을 알아본다. 결과적으로 자스민 공주 캐릭터의 변화가 돋보였다. 과거의 디즈니 애니메이션에서는 가부장적이고 남성 의존적인 공주 캐릭터가 대다수였다면, 현재 디즈니는 자기 주도적이고 독립적인 여성상을 지향하고 있었다. 또한 성별, 인종, 계급의 고정관념을 심어 줄 수 있는 장면은 변경되어 있었다. 디즈니의 변화는 대중이 원하는 젠더 이미지를 표현했다고 볼 수 있다. 이러한 작품 속 캐릭터 성격 변화에 대한 분석은 대중들에게 매력적인 캐릭터 제작에 있어 유용한 방법론이 될 수 있을 것이다.
페이딩 채널 환경에서 MC-CDMA/QPSK 시스템의 성능분석
정재필 京畿專門大學 1999 京畿專門大學 論文集 Vol.- No.27
This paper has analyzed the Error performance of MC-CDMA/QPSK system adopting error control coding and diversity reception techniques in fading channel Environment. Also, this paper has compared the Error performance of MC-CDMA/QPSK system with that of DS-CDMA/QPSK system. From the obtained results it is found that the Error performance of MC-CD77A/QPSK system has been improved considerably by convolutional coding and MRC diversity reception techniques. Also, it is confirmed that MC-CDMA/QPSK system produces better Error performance than DS-CDMA/QPSK system in fading channel Environment as the number of users increases.
부분대역 간섭이 존재하는 직교 멀티캐리어 시스템의 성능 개선에 관한 연구
정재필 京畿專門大學 1998 京畿專門大學 論文集 Vol.- No.26
The orthogonal multicarrier modulation is considered as an effective technique in high speed digital transmission under the multipath fading. In this paper, we theoretically analyze the bit error rate (BER) and has evaluated the performance improvement of orthogonal multicarrier QDPSK system with partial-band interference using BCH coding in a frequency selective fading environment. The result shows that when D/U=10 dB in the SNR of 30 dB, multicarrier QDPSK system adopting BCH coding technique presents better error performance in terms of partial-band interference (γ=0.5).
임펄스성 잡음과 페이딩이 존재하는 채널에서 OFDM시스템의 성능 분석
정재필 京畿專門大學 2000 京畿專門大學 論文集 Vol.- No.28
In this paper, we analyze the BER performance of OFDM system and improve its performance adopting convolutional coding as a performance improvement technique in frequency selective Rayleigh fading channel with impulsive noise. When the channel delay time is shorter than the guard band, OFDM system shows good BER performance, however when the channel delay time becomes longer than the guard band, its BER performance is abruptly degraded in frequency selective Raylelgh fading channel with impulse noise. Moreover, when contaminated by strong impulsive noise in the channel, BER performance falls to about 10^(-1).