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.

하지의 대각선 운동과 직선 운동 시 대뇌 운동영역 활성도 비교 -사례연구-

이승윤,이민형,Lee, Seuong-Yun,Rhee, Min-Hyung 대한고유수용성신경근촉진법학회 2016 PNF and Movement Vol.14 No.3

Purpose: The purpose of this study was to compare cerebral motor area activation between the diagonal and straight movements of the lower extremity. Methods: The subjects of this study consisted of two right-handed adults. Functional magnetic resonance imaging was conducted to measure brain activation following the diagonal and straight movements of the lower extremity. The primary motor area, premotor area, and supplementary motor area, which are closely related to exercise, were set as the regions of interest. Results: The brain activation by diagonal movement was an average of $1036{\pm}75$ voxel, and brain activation by straight exercise was an average of $773{\pm}55$ voxel. Conclusion: Based on these results, we conclude that the activation of the cerebral motor area is more effective for diagonal movements than for straight movements.

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.

차세대 모바일 웹, 모바일OK 표준화 전략

이승윤,권성인,Lee, Seung-Yun,Gwon, Seong-In 한국정보통신기술협회 2010 TTA저널 Vol.132 No.-

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.

금속 배선 공정에서의 reflow 현상

이승윤,박종욱,Lee, Seung-Yun,Park, Jong-Uk 한국재료학회 1999 한국재료학회지 Vol.9 No.5

The theory of the reflow applied to metallization process was studied, and the factors affecting the reflow and the relation between the reflow and the grain growth were investigated. The driving force for the metal reflow is the difference in chemical potentials along the metal surface, and it causes the atom movement. On condition that metal interconnect is fabricated for semiconductor devices, surface diffusion is the primary atom movement mechanism. The metal reflow is influenced by reflow temperature, reflow time, reflow ambient, thin film thickness, thin film material, underlayer material, pattern size, and aspect ratio. It is supposed that the reflow characteristic varies according to the grain growth during the reflow, so the effect of the grain growth on the reflow should be considered. 금속 배선 공정에서 응용되고 있는 reflow에 관한 이론올 살펴보고, 금속 박막 reflow에 영향을 미치는 인자 및 re­flow와 grain growth의 관계를 고찰하였다. 금속 박막 reflow의 구동력은 표연 위치에 따른 chemical potential의 차이이며, 이러 한 구동력에 의하여 원자가 이동하게 된다. 반도체 소자의 금속 배선을 제작하는 조건에서 원자의 이동은 주로 surface diffusion에 의하여 이루어진다. 금속 박막의 reflow에 영향율 미치는 인자로는 reflow 온도, reflow 시간, reflow 분위기, 박막 두께, 박막 재료, underlayer 재료, 패턴 size, aspect ratio가 있으며, 박막을 reflow시키는 동안에 발생하는 grain growth에 의하여 reflow 특성이 변할 것으로 예상되므로 reflow 시 grain growth의 영향을 고려하여야 하리라 생각된다.

바이어스 스트레스에 의한 실리콘-게르마늄 이종접합 바이폴라 트랜지스터의 열화 현상

이승윤,유병곤,Lee, Seung-Yun,Yu, Byoung-Gon 한국진공학회 2005 Applied Science and Convergence Technology Vol.14 No.4

바이어스 스트레스 인가 후에 발생하는 실리콘-게르마늄 이종접합 바이폴라 트랜지스터(SiGe HBT)의 열화현상을 고찰하였다. SiGe HBT가 바이어스 스트레스에 일정 시간 노출되면 소자 내부의 변화에 의하여 소자 파라미터가 원래 값으로부터 벗어나게 된다. 에미터-베이스 접합에 역방향 바이어스 스트레스가 걸리면 전기장에 의해 가속된 캐리어가 재결합 중심을 생성하여 베이스 전류가 증가하고 전류이득이 감소한다. $140^{\circ}C$ 이상의 온도에서 높은 에미터 전류를 흘려주는 순방향 바이어스 전류 스트레스가 가해지면 Auger recombination이나 avalancHe multiplication에 의해 형성된 핫 캐리어가 전류이득의 변동을 유발한다. 높은 에미터 전류와 콜렉터-베이스 전압이 동시에 인가되는 mixed-mode 스트레스가 가해지면 에미터-베이스 역방향 바이어스 스트레스의 경우와 마찬가지로 베이스 전류가 증가한다. 그러나 miked-mode 스트레스 인가 후에는 inverse mode Gummel 곡선에서 베이스 전류 증가가 관찰되고 perimeter-to-area(P/A) 비가 작은 소자가 심각하게 열화되는 등 에미터-베이스 역방향 바이어스 스트레스와는 근본적으로 다른 신뢰성 저하 양상이 나타난다. The degradation phenomena in SiGe hetero-junction bipolar transistors(SiGe HBTs) induced by bias stress are investigated in this review. If SiGe HBTs are stressed over a specific time interval, the device parameters deviate from their nominal values due to the internal changes in the devices. Reverse-bias stress on emitter-base(EB) junctions causes base current increase and current gain decrease because carriers accelerated by the electrical field generate recombination centers. When forward-bias current stress is conducted at an ambient temperature above $140^{\circ}C$ , hot carriers produced by Auger recombination or avalanche multiplication induce current gain fluctuation. Mixed-mode stressing, where high emitter current and high collector-base voltage are simultaneously applied to the device, provokes base current rise as EB reverse-bias stressing does.

유비쿼터스 시대의 기술 표준화

이승윤,Lee, Seung-Yun 한국컴퓨터사용자협회 2006 The USERS Vol.48 No.-

곽향정기산(藿香正氣散)으로 호전된 소음인(少陰人) 아토피 피부염 환자 치험 1례

이승윤,배효상,박성식,Lee, Seung-Yun,Bae, Hyo-Sang,Park, Seong-Sik 사상체질의학회 2010 사상체질의학회지 Vol.22 No.4

1. Objectives This study is about a Soeumin Atopic Dermatitis Patient. In this study, we report the effects of Sasang constitutional treatment to this patient. 2. Methods This patient was treated by Soeumin's constitutional medications and acupunture according to the result of Sasang constitutional diagnosis. 3. Results and Conclusions This patient's chief complaints were edema, palule, erythema, squama and pruritus. By using Gwakhyangjeonggi-san, she showed positive response about her symptom. This study shows that Gwakhyangjeonggi-san has effect to Atopic Dermatitis in Soeumin.

스트레스로 인한 손발 저림을 주소로 하는 태음인(太陰人) 환자 치험 2례

이승윤,반덕진,이희승,한경석,배효상,박성식,Lee, Seung-Yun,Ban, Duk-Jin,Lee, Hee-Seung,Han, Kyung-Suk,Bae, Hyo-Sang,Park, Seong-Sik 사상체질의학회 2008 사상체질의학회지 Vol.20 No.1

1. Objectives The purpose of this case report is to evaluate the effects of Sasang Constitutional diagnosis and treatment of two patients who were diagnosed as Taeumin Dry-Heat Syndrome. 2. Methods Two numbness patients were diagnosed as Taeumin Dry-Heat Syndrome based on their Nature & Emotion, physical characteristics and symptoms. 3. Results and Conclusions Two numbness patients who were treated with Chungsimyonja-tang showed improvement in numbness. The necessity of managing the psychological aspects of the pathology through Nature and Emotion is also mentioned.