패키지된 실리콘-게르마늄 이종접합 바이폴라 트랜지스터의 콜렉터 형성 조건에 따른 전기적 특성

이승윤,이상흥,김홍승,박찬우,김상훈,이자열,심규환,강진영,Lee, Seung-Yun,Lee, Sang-Heung,Kim, Hong-Seung,Park, Chan-U,Kim, Sang-Hun,Lee, Ja-Yeol,Sim, Gyu-Hwan,Gang, Jin-Yeong 한국재료학회 2002 한국재료학회지 Vol.12 No.6

The effects of the conditions of the collector formation on electrical characteristics of the packaged SiGe hetero-junction bipolar transistors (HBT) were investigated. While the DC characteristics of SiGe HBTs such as IV characteristic, forward current gain, Early voltage, and breakdown voltage were hardly changed after packaging, the AC characteristics such as $f_{\tau}\; and\; f_{max}$ were degraded severely. With the rise of the collector concentration, the break-down voltage decreased but the $f_{\tau}$ increased. Additionally, $\beta$ and $f_{\tau}$ values were kept high in the range of elevated collector current due to the increase of the critical current density for the onset of the Kirk effect. The devices As implanted before the collector deposition showed lower breakdown voltage and higher $f_{\tau}$ than the others, which seems to be originated from the As up-diffusion resulting in the thinner collector.

전세계 차세대인터넷 망 구축 동향

이승윤,박정수,김용진,Lee, S.Y.,Park, J.S.,Kim, Y.J. 한국전자통신연구원 2000 전자통신동향분석 Vol.15 No.6

본 고에서는 현재 전세계적으로 진행되고 있는 차세대인터넷 망 구축 동향을 소개한다. 한국의 KOREN IPv6 프로젝트를 포함한 미국의 Internet2 백본인 vBNS, 유럽의 IPv6 프로젝트인 6INIT, 캐나다의 광 인터넷 백본인 CANARIE의 CA*net 프로젝트 그리고 일본의 WIDE 프로젝트에서 수행중인 IPv6 기반 차세대 인터넷 망 구축현황에 대해 소개한다.

대화형 비디오 서비스를 위한 VBR-MPEG 비디오의 효율적인 전송기법

이승윤,김용진,유황빈,Lee, Seung-Yun,Kim, Yong-Jin,Ryou, Hwan-Bin 한국정보처리학회 2000 정보처리논문지 Vol.7 No.1

일반적으로 MPEG과 같이 VBR 트래픽 특성을 지닌 비디오는 프레임간의 심한 편차로 인해 대역폭 활용측면에서 효율적인 전송이 어렵다. 이를 위해 제안된 방법이 대역폭 순화(bandwidth smoothing) 기법으로써 상대적으로 적은 대역폭 할당과 선인출을 이용한 방법이다. 하지만 이러한 기존의 방법들은 VCR 기능과 같은 대화형 비디오 서비스에 있어서의 일어날 수 있는 서비스 요구에 대한 효과적인 대역폭 순화 기법 및 전송정책을 제공하고 있지 않다. 본 논문에서는 MPEG과 같은 VBR 트래픽 특성을 갖는 비디오에 대해 대화형 서비스를 제공하기 위한 대역폭 할당 기법을 제안하고 성능을 평가하였다. 이 기법은 기존의 대역폭 순화 기법이 제공하지 못했던 VCR 기능과 같은 서비스를 제공할 수 있을 뿐만 아니라 동시에 대역폭 활용 이득을 극대화시킬 수 있는 방법을 제공한다. 실험을 통해 제안하는 기법은 대화형 비디오 서비스 제공시 증가될 수 있는 트래픽의 양을 현저히 감소시킬 수 있음은 물론 동시에 재생에 대한 연속성도 보장시킬 수 있음을 증명하였다. In general, it is difficult to transmit a VBR video like MPEG efficiently since MPEG fames are construct with various size. To solve this problem, some bandwidth smoothing techniques are proposed which is based on the prefetching video data into the client buffer with low bandwidth allocation. However these techniques do not provide efficient bandwidth smoothing technology and transmission technique for interactive video services like VCR-like functionality. In this paper, we propose and evaluated a new bandwidth allocation mechanism for interactive video services which has VBR traffic characteristics such a MPEG. This technique provides VCR-like functionality which is not supported on previous techniques and also maximizes the bandwidth utilization when interactive video services are provided. Through our experimental, we prove that the proposed technique dramatically decreases a traffic and guarantee the continuous playback simulaneously.

대화형 비디오 서비스를 위한 MPEG 비디오 기반의 동적 대역폭 관리 기법

이승윤,유황빈,Lee, Seung-Yun,Yu, Hwang-Bin 한국정보처리학회 1999 정보처리논문지 Vol.6 No.2

가변 압축 미디어 특성을 갖는 비디오 서비스는 발생되는 프레임 단위의 트래픽의 유동성 때문에 대역폭 관리에 있어 많은 제약을 수반한다. 특히, MPEG 비디오와 같이 VBR(Variable Bit Rate) 트래픽 특성을 갖는 비디오에 대한 대역폭 관리는 프레임간의 심한 트래픽 변이 때문에 대역폭 활용 이득이 낮아진다. 또한, VOD(Video-On-Demand)와 같은 대화형 비디오 서비스에서 VCR 기능과 같은 대화형 서비스를 제공할 때의 트래픽 변화는 예측하기 힘들기 때문에 효과적인 대역폭 관리가 힘들다. 본 논문에서는 MPEG 비디오와 같이 VBR 트래픽 특성을 지닌 저장 미디어를 기반으로 하는 대화형 비디오 서비스를 위한 동적 대역폭 할당 방법을 제안한다. 이 방법은 선인출 기반의 가변구간 대역폭 할당 기법과 다수 스트림에 대한 동적 대역폭 관리를 통해 주어진 전체 대역폭의 활용율을 극대화시킨다. 또한, 제안하는 기법은 MPEG 스트림의 트래픽 특성을 반영한 대역폭 할당 방법을 적용하며, 다중 스트림에 대해 동적 대역폭 관리를 사용한 네트워크 자원 활용을 극대화시킬 수 있는 방법을 제공한다. A variable bit-rate based video services have much limitation for bandwidth management, since its trarfic has a some variances in frame level. In particular, the bandwidth management for video which has characteristics of VBR traffic such a MPEG video could be more complicated. Also, it is difficult to manage the bandwidth effectively for proving a VCR function from VOD service, since we don't know the traffic variance exactly at that time. In this paper, we proposed the dynamic bandwidth allocation a scheme based on VBR traffic based stored video such as MPEG for interactive video service. This scheme can maximize the given total bandwidth through the prefetch based variable length bandwidth allocation scheme and dynamic bandwidth management scheme for multiple streams. Also, our scheme can be used for a MPEG-based bandwidth allocation scheme, and provides the method that can maximize the utilization of network resource for multiple stream by using a dynamic bandwidth management.

가족친화인증기업(관)의 가족친화경영 성과 및 사후지원 효과 - 기업성과와 사회적 성과를 중심으로 -

이승윤,이유리,Rhee, Seung-Yoon,Lee, Yu Ri 한국가족자원경영학회 2021 가족자원경영과 정책 Vol.25 No.3

The purpose of this study was to examine the effectiveness of family-friendly management in 501 family-friendly certified firms and to analyze organizational and social outcomes outlined by the firms. In addition, this study aimed to discover ways to promote family-friendly management by investigating the effects of ongoing support to certified firms, including family-friendly consulting and workplace training. The results showed that certified firms administer family-friendly workplace policies at a satisfactory level, while their management of policy indices and outcomes were not effective. The finding suggests that family-friendly management indices need to be aligned with firms' substantial outcomes. An improved organizational image and trust were major organizational outcomes of family-friendly management, and an enhanced CEO perception and a culture centered on gender-equality were significant social outcomes. These outcomes need to be promoted to attract organizations to engage in family-friendly management. The finding further implies the important roles of organizations in cultivating family-friendly environments in society. Finally, the certified firms with ongoing consulting and training support exhibited higher levels of family-friendly management and organizational and social outcomes. This study sheds light on the importance of long-term, systematic efforts by organizations in fostering family-friendly management and achieving organizational and social outcomes.

SPECIAL FEATURES I - 인터넷과 웹 기술의 진화 02 - IT 넘어 산업간 융합 핵심기술로 자리매김할 것

이승윤,Lee, Seung-Yun 한국과학기술단체총연합회 2012 과학과 기술 Vol.513 No.-

Special Theme - 클라우드 컴퓨팅 - 국내외 클라우드 컴퓨팅 표준화 동향

이승윤,Lee, Seung-Yun 한국정보통신기술협회 2012 TTA저널 Vol.139 No.-

전력산업 신시장 개척을 위한 한전의 DC배전 추진노력

이승윤,Lee, Seung-Yun 대한전기협회 2015 전기저널 Vol.463 No.-

생산성 향상을 위한 분만사 관리의 핵심 포인트

이승윤,Lee, Seung-Yun 대한양돈협회 2008 養豚 Vol.30 No.2

Study on the current research trends and future agenda in animal products: an Asian perspective

이승윤,Da Young Lee,Ermie Jr. Mariano,윤승현,이주현,Jinmo Park,Yeongwoo Choi,Dahee Han,Jin Soo Kim,Seon-Tea Joo,허선진 한국축산학회 2023 한국축산학회지 Vol.65 No.6

This study aimed to analyze the leading research materials and research trends related to livestock food in Asia in recent years and propose future research agendas to ultimately contribute to the development of related livestock species. On analyzing more than 200 relevant articles, a high frequency of studies on livestock species and products with large breeding scales and vast markets was observed. Asia possesses the largest pig population and most extensive pork market, followed by that of beef, chicken, and milk; moreover, blood and egg markets have also been studied. Regarding research keywords, “meat quality” and “probiotics” were the most common, followed by “antioxidants”, which have been extensively studied in the past, and “cultured meat”, which has recently gained traction. The future research agenda for meat products is expected to be dominated by alternative livestock products, such as cultured and plant-derived meats; improved meat product functionality and safety; the environmental impacts of livestock farming; and animal welfare research. The future research agenda for dairy products is anticipated to include animal welfare, dairy production, probiotic-based development of high-quality functional dairy products, the development of alternative dairy products, and the advancement of lactose-free or personalized dairy products. However, determining the extent to which the various research articles’ findings have been applied in real-world industry proved challenging, and research related to animal food laws and policies and consumer surveys was lacking. In addition, studies on alternatives for sustainable livestock development could not be identified. Therefore, future research may augment industrial application, and multidisciplinary research related to animal food laws and policies as well as eco-friendly livestock production should be strengthened.