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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.
상변화 메모리 소자 동작 특성에 미치는 열처리 온도 효과
이승윤,박영삼,Lee, Seung-Yun,Park, Young-Sam 한국진공학회 2010 Applied Science and Convergence Technology Vol.19 No.2
상변화 메모리 소자 제작 공정의 단위 스텝인 최종 열처리의 온도가 상변화 메모리 소자 특성에 미치는 영향을 고찰하였다. $Ge_2Sb_2Te_5$ (GST) 박막을 활성 물질로 하는 기공(pore) 구조의 단위 상변화 메모리 소자를 제작하고, $160^{\circ}C$에서 $300^{\circ}C$까지의 온도 범위에서 최종 열처리를 실시하였다. 상변화 메모리 소자의 SET 저항에서 RESET 저항으로의 셀 저항 변화 양상은 최종 열처리 온도에 따라 큰 차이를 나타내었다. 정상적인 상변화 메모리 동작 특성을 얻을 수 있는 임계 열처리 온도가 존재하며, 열처리 온도가 그 온도에 비해 상대적으로 높거나 낮은 경우에는 소자가 오동작하거나 불안정하게 동작하는 것을 확인하였다. 이러한 열처리 온도의 효과는 열에너지에 따른 상부전극-GST 박막-발열층 다층 구조의 열적 안정성과 밀접한 관련이 있는 것으로 보인다. The effect of process temperature of a final annealing step in the fabrication of phase change memory (PCM) devices was investigated. Discrete PCM devices employing $Ge_2Sb_2Te_5$ (GST) films as an active element were made in a pore-style configuration, and they were annealed at various temperatures ranging from 160 to $300^{\circ}C$. The behaviors of cell resistance change from SET resistance to RESET resistance were totally different according to the annealing temperatures. There was a critical annealing temperature for the fabrication of normal PCM devices and abnormal operations were observed in some devices annealed at temperatures lower or higher than the critical temperature. Those influences of annealing temperature seem closely related to the thermal stability of a top electrode/GST/heating layer multilayer structure in the PCM devices.
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.
소음인(小陰人) 환자에서 나타난 열격(?膈)유사증의 치험 1례
이승윤,반덕진,배효상,박성식,Lee, Seung-Yun,Ban, Duk-Jin,Bae, Hyo-Sang,Park, Seong-Sik 사상체질의학회 2009 사상체질의학회지 Vol.21 No.1
1. Objective This study is about a Soeumin patient who had Yul Gyuk similarity with anorexia, nausea, sialism. 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 anorexia, nausea, and sialism. By using Gyejibanhasaenggang-tang mainly, he showed positive response about his symptom. This study shows that Gyejibanhasaenggang-tang has effect to Yul Gyuk similarity in Soeumin.
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.
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.2
1. Objective Primary aldosteronism is clinically characterized by hypertension and hypokalemia. The purpose of this article is to report our case about a female patient with suspected primary aldosteronism. 2. Methods We diagnosed her as Soyangin Heat Sensation in chest and treated with Yangkyuksanhwa-rang and Hyungbangjihwang-tang. And potassium replacement therapy was applied to correct hypokalemia. 3. Results and Conclusions In this case, through Herb-medication, most symptoms were improved except dry mouth, Bur hypokalemia was not corrected, and primary aldosteronism was suspected on the basis of the blood results and symptoms.