플립 칩 본딩을 위한 솔더 범핑

정재필,이희열,전지헌,Jung, Jae-Pil,Lee, Hee-Yul,Cheon, Ji-Hun 대한용접접합학회 2008 대한용접·접합학회지 Vol.26 No.1

급속응고에 의한 in - situ Al - 10Ti - 4Fe 복합재료의 미세조직과 기계적 성질에 관한 연구

정재필,권숙인,김혜성,금동화 대한금속재료학회 1996 대한금속재료학회 학술대회 개요집 Vol.1996 No.1

<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.

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.

Dispersion-Managed Link Configured with Repetitively Shaped Dispersion Maps and Embedded with Mid-span Spectral Inversion

정재필,이성렬 한국정보통신학회 2022 Journal of information and communication convergen Vol.20 No.4

A dispersion map was proposed to improve the compensation effect of a distorted WDM (wavelength division multiplexed) channel in a dispersion-managed link coupled with optical phase conjugation. The dispersion map is an origin-symmetric structure around the optical phase conjugator in the middle of the transmission path. In addition, the dispersion map has a form in which a constant dispersion accumulation pattern is repeated regularly. Through simulation, we confirmed that the application of the origin-symmetric dispersion map with a repetitively shaped configuration was more effective in compensating for the distorted WDM channel than in the dispersion-managed link with a conventional dispersion map. In addition, we confirmed that the compensation effect could be increased when the cumulative dispersion distribution of the origin-symmetric distribution map had a positive value in the first half section and a negative value in the second half section. Further, we observed that as the number of repeated dispersion accumulation patterns increased, the residual dispersion per span should also be increased.

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).

Non-shielded FCAW시 스팻터 발생 연구

정재필 서울시립대학교 산업기술연구소 1997 산업기술연구소논문집 Vol.5 No.-

Effects of gas formers of MgCO3, CaCO3 and Li2CO3 on the spattering phenomena was investigated for non-shielded flux cored arc welding. Spattering Phenomena were pictured using high speed camera at a 3000 frames per sec. As experimental results, spattering modes were classified into 4 types. The modes were spattering by arc force, gas explosion short circuit and pore escape. The amount of spatters by arc force was 30%, gas blowing force was 40%, short circuit 10%, Pore escape was 10% and others were 10%. When Li2CO3 was added, the amount of spatters was largest and it decreased in the order of CaCO3 and MgCO3.

알루미늄의 비부식성 플럭스 브레이징 -일본의 브레이징 기술과 동향 (3)

정재필,강춘식,T.Takemoto 대한용접접합학회 1995 대한용접·접합학회지 Vol.13 No.2

강과 스테인레스강 brazing 부의 전단 강도에 미치는 Sn, P의 영향 연구

정재필,이보영,강춘식 대한용접접합학회 1989 대한용접·접합학회지 Vol.7 No.3

The furnace brazing in a Ar of copper to martensitic stainless steel(13.5Cr) using Cu-(5~8%)P-(0~8%)Sn powders was investigated. Shear strength, wettability, reacted layer, defect ratio at the stainless steel interface was evaluated. As Sn was added to the Cu-P powders, defect ratio and P content at the stainless steel interface decreased. And also as Sn was added, defect form at the stainless steel interface changed from the continuous layer to the discrete type, and shear strength of the brazed joint increased.

Rene80/B/Rene80계의 액상확산 접합과정 -B분말 도포법을 이용한 액상확산접합

정재필,강춘식 대한용접접합학회 1995 대한용접·접합학회지 Vol.13 No.2

Rene80 superalloy was liquid phase diffusion bonded by using boron(B) as an insert material, where B has high diffusivity and higher melting point as an insert material. Bonding procedure and bonding mechanism of Rene80/B/Rene80 joint were investigated. As results, liquid metal was produced by solid state reaction between base metal and insert material on bonding zone. The liquid metal was produced preferentially at the grain boundary. Except for production of liquid metal, other bonding procedure was nearly same as TLP(Transient Liquid Phase) bonding. Bonding time, however, was reduced compared to prior result of TLP bonding. By bonding S.4ks at l453K, Ren80/B/Rene80 joint was isothermally solidified and homogenized where thickness of insert material was 7.5.mu.m.