리드 온 칩 패키징 기술을 이용하여 조립된 반도체 제품에서 패시베이션 박막의 TC 신뢰성에 영향을 미치는 요인들

이성민,이성란,Lee, Seong-Min,Lee, Seong-Ran 한국재료학회 2009 한국재료학회지 Vol.19 No.5

This article shows various factors that influence the thermal-cycling reliability of semiconductor devices utilizing the lead-on-chip (LOC) die attach technique. This work details how the modification of LOC package design as well as the back-grinding and dicing process of semiconductor wafers affect passivation reliability. This work shows that the design of an adhesion tape rather than a plastic package body can play a more important role in determining the passivation reliability. This is due to the fact that the thermal-expansion coefficient of the tape is larger than that of the plastic package body. Present tests also indicate that the ceramic fillers embedded in the plastic package body for mechanical strengthening are not helpful for the improvement of the passivation reliability. Even though the fillers can reduce the thermal-expansion of the plastic package body, microscopic examinations show that they can cause direct damage to the passivation layer. Furthermore, experimental results also illustrate that sawing-induced chipping resulting from the separation of a semiconductor wafer into individual devices might develop into passivation cracks during thermal-cycling. Thus, the proper design of the adhesion tape and the prevention of the sawing-induced chipping should be considered to enhance the passivation reliability in the semiconductor devices using the LOC die attach technique.

지각과민 치아에 대한 처치약재의 임상적 연구

이성민,이찬영,이승종,박동수,Lee, Seong-Min,Lee, Chan-Young,Lee, Seung-Jong,Park, Dong-Soo 대한치과보존학회 1989 Restorative Dentistry & Endodontics Vol.14 No.1

The purpose of this study was to evaluate the periodic effect of desensitizing drug such as potassium oxalate(D.D.S. # I&II), strontium chloride (ZAROSEN)$^{(R)}$, and placebo group. The 193 teeth of 93 patients who had been complained dental hypersensitivity, and were divided into three groups by application agent and desensitizing treatment was completed. The interval of observation and treatment period were immediately, 1 week, 2 week, 3 week, 4 week, before and after treatment. The data was statistically analized and the results were as followed. 1. Group I showed best desensitizing effect to the stimuli, followed by Group II, Group III. 2. There was a significant difference (p < 0.005) in desensitizing effect among the Group I, Group III and Group II, Group III but there was no significant difference (p < 0.005) in Group I, Group II. 3. The cold stimuli was most effective in desensitization and there was a significant difference (p < 0.005) in cold, air-blast, but there was no significant difference (p < 0.005) in other stimuli. 4. There was no significant difference (p < 0.005) in effect of the desensitization of the cause of exposed dentine. 5. Anterior teeth was more effective than posterior teeth in desensitization and there was a significant difference (p < 0.005) between anterior teeth and posterior teeth. 6. In analysis of stimuli on the potassium oxalate, there was a significant difference (p < 0.005) in cold, air-blast but there was no significant difference (p < 0.005) in other stimuli.

汾西 朴瀰의 書畵애호와 그 기록 : 「丙子亂後集舊藏屛障記」를 중심으로

이성민(Lee, seong-min) 동양한문학회 2011 동양한문학연구 Vol.32 No.-

汾西 朴?는 병자호란이 끝난 뒤 강화도에서 돌아와, 소장하고 있던 8점의 서화 작품들을 다시 裝幀하여 병풍으로 만들었다. 그리고 ?丙子亂後集舊藏屛障記?라는 제목 하에 총 8편의 記를 지었다. 이 글에는 서화 品評에 뛰어났던 박미의 모습을 비롯하여 當代 서화계의 다양한 품평 활동이 기록되어 있다. 아울러 서화와 관련된 다수의 逸話가 채록되어 있다. 따라서 17세기 전반기 서화계의 실상을 보여주는 중요한 자료이다. ?丙子亂後集舊藏屛障記?의 내용은 4가지 정도로 요약할 수 있다. 첫째는 宣祖의 御筆 서화에 대한 品評으로, 宣祖의 서화 취향과 성취를 기록하였다는 점에 의의가 있다. 둘째, 當代의 전문적 서화 품평 활동에 관한 내용을 기록하였다. 특히 뛰어난 서화 품평가로서 白沙 李恒福의 위상이 잘 나타나있다. 셋째, 서화 관련 일화의 채록이다. 초상화에 뛰어났던 李信欽 관련 일화는 여타 기록에 보이지 않는 흥미로운 기록이다. 이 일화들은 17세기 전반기 조선 서화계의 이면을 보여준다는 점에서 중요하게 다루어야 한다. 넷째 松雪體에서 王羲之體로의 書體 변화에 대한 박미의 비판적 입장을 확인할 수 있는데, 이 점에 대해서는 보다 구체적인 고찰이 필요하다. ?丙子亂後集舊藏屛障記?는, 題跋 등을 통해 산발적으로 이루어지던 이전 시기 서화 관련 논의의 형태를 벗어나, 같은 제목 하에 서화만을 집중적으로 논의한 ‘최초의 기록’이라는 점에서 그 가치를 평가할 수 있다. Bunseo Park-Mi returning from Kanghwa(江華) Island after Byeongja-horan was over made folding screen again by arranging 8 pieces of work of calligraphy and paintings. And he wrote total 8 writing with title of Byeongjananhu-jipgujangbyungjangi(丙子亂後集舊藏屛障記), meaning of recording document that was written after manufacturing folding screen with collecting old paintings owned by him after Byeongja-horan was over. Various evaluation activities of calligraphy and paintings world at that time were recorded in this writing. Together, many anecdotes related to calligraphy and paintings were collected. Therefore, it is important data that show actual circumstances of calligraphy and paintings world at first half years of 17th century. The contents of this writing can be summarized by four. First, that make evaluation about King Seonjo(宣祖)'s work, there is a meaning that recorded King Seonjo's inclination and accomplishment of calligraphy and paintings. Second, it recorded contents about professional calligraphy and paintings evaluation activity at that time. Especially, he raised the image of Baeksa Lee-hangbok(李恒福) as excellent calligraphy and paintings evaluator. Third, it is collection of anecdotes of calligraphy and paintings. These anecdotes are important at point that show part which it is not known well of Joseon dynasty calligraphy and paintings world at first half years of 17th century. Fourth, we can confirm Park-Mi's critical standpoint about change from Songseolche(松雪體) to Wangheejiche(王羲之體), need more specific investigation about this point. Byeongjananhu-jipgujangbyungjanggi, escaping discussion form related to calligraphy and paintings attained sporadically through Jebal(題跋) at previous time, can be evaluated by the value of “The first recording” that discuss only calligraphy and paintings intensively under same title.

등방 다차원 배열을 이용한 FH 무전기용 주파수 자원 할당 알고리즘

이성민,한주희,Lee, Seong-Min,Han, Joo-Hee 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.4

To reduce the interferences between the radio equipments which are operated in frequency hopping mode, the frequency resource should be assigned to each equipment without overlapping when several groups of radio equipments operate in the same area. If the radio equipments are in a different area, the partial frequency overlaying can be permitted. From the isotropic multi-dimensional array, several frequency assignment tables can be extracted for a same area. Also several tables can be extracted for different areas. Since there can be no overlapped frequencies between the tables for the same area, no interference between the radio equipments in an area is guaranteed. The frequencies overlapped between 2 tables for 2 different areas are pre-planed as required. The interference performance in frequency hopping radio can be controlled as desired using the proposed Frequency Resource Assignment Algorithm using Isotropic multi-dimensional Array.

실리콘 웨이퍼에 2중 다이싱 공정의 도입이 반도체 디바이스의 T.C. 신뢰성에 미치는 영향

이성민,Lee, Seong-Min 한국마이크로전자및패키징학회 2009 마이크로전자 및 패키징학회지 Vol.16 No.4

This work shows how the adoption of a dual-dicing process for silicon wafer separation affects the thermal-cycling reliability (i.e. $-65^{\circ}C$ to $150^{\circ}C$) of the semiconductor devices utilizing lead-on-chip (LOC) die attach technique. In-situ examinations show that conventional single-dicing process directly attacks the edge region of diced devices but dual-dicing process effectively protects the edge region of diced devices from dicing-induced mechanical damage. Probably, this is because the preferential and sacrificial fracture of notched regions induced on the active surface of wafers saves the edge regions. It was also investigated through thermal-cycling tests that the number of thermal-cycling induced failures is much lower at the dual-dicing process than the single-dicing process.

리드 온 칩 패키징 기술을 이용하여 조립된 반도체 제품에서 패시베이션 파손을 막기 위한 본딩패드의 합리적 설계

이성민,김종범,Lee, Seong-Min,Kim, Chong-Bum 한국마이크로전자및패키징학회 2008 마이크로전자 및 패키징학회지 Vol.15 No.2

This article shows that the susceptibility of the device pattern to thermal stress-induced damage has a strong dependence on its proximity to the device comer in semiconductor devices utilizing lead-on-chip (LOC) die attach technique. The result, as explained based on numerical calculation and experiment, indicateds that the stress-driven damage potential of the passivation layer is the highest at the device comer. Thus, the bonding pads, which are very susceptible to passivation damage, should be designed to be located along the central region rather than the peripheral region of the device.

지하 매설 구조물의 부식과 방식 4 . 현장접합부 방식용 피복

이성민,김영근,고영태 ( Seong Min Lee,Young Geun Kim,Young Tai Kho ) 한국부식방식학회 1998 Corrosion Science and Technology Vol.27 No.1

정규화한 RMR 변수들의 평가 경향에 대한 고찰

이성민,이연희,김선명,Lee, Seong-Min,Lee, Yeon-Hee,Kim, Sun-Myung 한국터널지하공간학회 2012 한국터널지하공간학회논문집 Vol.14 No.1

RMR은 평가방법의 수월성으로 인해 터널과 사면 등 토목공사 현장에서 암반평가 방법으로 널리 활용되고 있는 만큼 좀 더 쉽고 신뢰성 있는 수정 RMR법을 찾기 위한 연구는 꾸준히 진행되어 왔다. 그만큼 RMR에 대한 다수의 연구들이 여러 가지 통계적 분석 및 평가기법에 의해 변수의 개수나 배점을 조정한 수정 RMR법 제시에 치중된 측면도 있다. 따라서 본 연구에서는 정규화한 RMR변수들의 평가 경향 분석을 통하여 기 연구들에서 중요 평가 변수들을 공통적으로 포함하면서도 다양한 변수조합의 수정 RMR법들이 제안될 수 있었던 당위성에 대하여 고찰하였다. 나아가 변수들의 분포경향으로부터 현장에서의 평가경향에 대해서도 역 추론 하였다. 약 2000개의 현장 측정 데이터들에 대해 정규화한 후 RMR과 각 변수들의 1:1 평가를 실시한 결과 일정한 패턴의 상관관계와 평가경향이 나타났다. 정량적 평가 변수인 일축압축강도와 RQD는 RMR 기준선 대비 항시 상향 분포 추세로 나타나 RMR 값들을 평가절상 하는 역할을 하는 반면, 정성적 평가 성향이 큰 절리 상태와 지하수는 기준선 대비 대부분 하향 분포 추세로 나타나 RMR 값들을 평가절하 하는 역할을 하는 것으로 판단된다. 이를 통해 정량적인 변수들과 정성적인 변수들을 적절히 조합하면 어려운 통계분석 없이도 수정 RMR법을 제시할 수 있음을 알 수 있다. 또한 정성적인 변수에 대한 현장 엔지니어의 보수적인 암반평가 경향도 추론할 수 있다. Due to the convenience, RMR has been widely applied in civil engineering works such as tunnel, slope, and so on. Many researchers have studied to suggest more simple and trustable RMR by modifying its parameters. However, those researches have just focused on looking for easy modified-RMRs by reducing number of parameters using various statistical analyses. Therefore, this research studied questions of modified-RMRs and gaps between RMR and its parameters. Approximately 2,000 parameters of 400 RMRs from various tunnel sites were normalized respectively and compared with one another to study their relations and divergences. The comparison results showed that there were common patterns among RMR and parameters. Data of uniaxial compressive strength and RQD, qualitative parameters, were located in upper side of RMR line. Discontinuity condition and ground water, quantitative oriented parameters, were opposite to them. It means if both qualitative and quantitative parameters can be properly combined then it can be easy to make simple and easy modified-RMRs without using difficult statistics. This results also show that the majority of field engineers used to estimate RMR conservatively when they did quantitative oriented parameters.

부호분할다중화 전송방식의 대전자전 능력 분석

이성민,김환우,Lee, Seong-Min,Kim, Whan-Woo 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.5

In this paper, we have introduced a Code Division Multiplexing transmission method which is similar to OFDM and analyze ECCM performances. We have verified CDM transmission method has a good LPI performance and a feasible ECCM performance. This capability could be useful for reduction of RF interference which occurs when many equipments operate densely in small area. The equipment that uses CDM transmission method supports variable transmission rate and order-wire effectively and conveniently to user. This CDM method has similar ECCM performance comparing to serial DS method. CDM method has good multi-path signal processing capability and could be useful for mobile communication environment.

시퀀스 추정기를 사용하는 CDMA 파일럿 수신회로

이성민,Lee, Seong-Min 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.4

In this paper a sequence estimator of CDMA communication system is suggested. A sequence estimator uses Galois Field operation. A sequence estimator can provide another CDMA pilot signal which is un-modulated spreaded signal. A estimated sequence signal and received signal have no correlation. Tow signals can be summed using MRC(maximal ratio combine) method. The stronger signal can be added as a larger ratio, but the weaker signal can be added as a smaller ratio. We can distinguish strong signal using SNR estimator. Therefore it is possible to receive an additional pilot signal, and to support more reliable communications by using sequence estimator.