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이재상,구상모,이상렬,Lee, Jae-Sang,Koo, Sang-Mo,Lee, Sang-Yeol 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.9
The TFTs have been fabricated with 3 different geometry SID electrodes which have the same channel W/L ratio (W/L = 5) due to constant channel resistance, The 3 samples have different channel widths (350, 150, and 25 ${\mu}m$) and channel lengths (70, 30, and 5 ${\mu}m$) by fixed channel W/L ratio simultaneously on one chip for reliable comparisons. Resultant on-current and field effect mobility are proportional to the channel width, while the subthreshold swing is inversely proportional to the channel width mainly due to the change of contact resistance. These results show that the contact resistance strongly affects the device performances and should be considered in the applications.
이온주입 공정을 이용한 4H-SiC p-n Diode에 관한 시뮬레이션 연구
이재상,방욱,김상철,김남균,구상모,Lee, Jae-Sang,Bahng, Wook,Kim, Sang-Cheol,Kim, Nam-Kyun,Koo, Sang-Mo 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.2
Silicon carbide (SiC) has attracted significant attention for high frequency, high temperature and high power devices due to its superior properties such as the large band gap, high breakdown electric field, high saturation velocity and high thermal conductivity. We performed Al ion implantation processes on n-type 4H-SiC substrate using a SILVACO ATHENA numerical simulator. The ion implantation model used Monte-Carlo method. We simulated the effect of channeling by Al implantation in both 0 off-axis and 8 off-axis n-type 4H-SiC substrate. We have investigated the effect of varying the implantation energies and the corresponding doses on the distribution of Al in 4H-SiC. The controlled implantation energies were 40, 60, 80, 100 and 120 keV and the implantation doses varied from $2{\times}10^{14}$ to $1{\times}10^{15}\;cm^{-2}$. The Al ion distribution was deeper with increasing implantation energy, whereas the doping level increased with increasing dose. The effect of post-implantation annealing on the electrical properties of Al-implanted p-n junction diode were also investigated.
한국의 신생아에서 선천성 대사이상 Screening에 관한 역학조사
이재상,최철석,최규순,이무주,두화선,강상훈,Lee, Jae-Sang,Choi, Cheol-Seok,Choi, Kyu-Soon,Lee, Mu-Ju,Doo, Hwa-Sun,Kang, Sang-Hoon 한국생명보험의학회 1999 保險醫學會誌 Vol.18 No.-
The disorders of congenital metabolic errors causing mental retardation can be prevented by early diagnosis and treatment. We analysed 144,000 neonatal blood samples for phenyketonuria(PKU), maple syrup urine disease(MSUD), homocystinuria(HCU) and histidinuria(HE) by bacterial inhibition method, and galactosemia(GAL) by Paigen method. In our survey, the positive were 4 samples in PKU(4mg/dl;2, 6mg/dl;1, 8mg/dl;1), 8 samples in MSUD(4mg/dl;2, 6mg/dl;2, 8mg/dl;3, 10mg/dl;1), 4 samples in HCU(4mg/dl;2, 6mg/dl;2), 4 samples in Galactosemia(4mg/dl;2, 6mg/dl;1, 8mg/dl;1), respectively. while, no one was positive in HE. The frequncy rate were 1/36,000 for PKU, HCU and GAL, 1/18,000 for MSUD, respectively. But those for HE couldn't be detected in our survey. In this study, the hightest frequency rate was 1/18,000 of MSUD, following were 1/36,000 for PKU, HCU and GAL, respectively. As results our data, it is our opinion that neonatal screening should be performed in terms of national policies for ealy diagnosis and theraphy.
프로스포츠 관중의 레플리카 구매성과, 소비감정, 재구매의도의 관계
이재상 ( Jae Sang Lee ),장현길 ( Hyeon Gil Jang ),조송현 ( Song Hyun Cho ) 한국스포츠산업경영학회 2014 한국스포츠산업경영학회지 Vol.19 No.3
본 연구의 목적은 프로스포츠 관중의 일반적 특성에 따른 레플리카 구매성과, 소비감정, 재구매의도의 차이를 규명하고, 구매성과와 소비감정의 관계, 소비감정과 재구매의도의 관계를 규명하는데 있다. 연구목적을 달성하기 위해 프로야구 및 프로축구 관중 가운데 레플리카를 착용하고 있는 294명을 편의표본추출법으로 표집한 후 설문조사를 실시하였다. 설문지 구성의 타당성 검증을 위해 탐색적 요인분석을 실시하였으며, 신뢰도 검증을 위해 Cronbach’s α 값을 이용하여 분석하였다. 자료처리는 SPSS Win 21.0 통계패키지 프로그램을 이용하였으며, 결과 분석을 위해 빈도분석, t-검정, 일원분산분석 및 사후검증, 상관관계분석, 다중회귀분석 등을 실시하였다. 이상의 연구방법을 통해 도출된 결과는 다음과 같다. 첫째, 성별에 따라 도구적 구매성과와 표현적 구매성과는 유의한 차이가 있는 것으로 나타났으며, 소비감정과 재구매의도는 유의한 차이가 없는 것으로 나타났다. 연령에 따라 긍정적 소비감정과 부정적 소비감정은 유의한 차이가 있는 것으로 나타났으며, 구매성과와 재구매의도는 유의한 차이가 없는 것으로 나타났다. 관람 종목에 따라 도구적 구매성과, 긍정적 소비감정, 부정적 소비감정, 재구매의도는 유의한 차이가 있는 것으로 나타났으며, 표현적 구매성과는 유의한 차이가 없는 것으로 나타났다. 둘째, 레플리카에 대한 표현적 구매성과는 긍정적 소비감정에 정(+)의 영향을 미치고 도구적 구매성과는 유의한 영향을 미치지 않는 것으로 나타났으며, 레플리카에 대한 표현적 구매성과와 도구적 구매성과는 부정적 소비감정에 부(-)의 영향을 미치는 것으로 나타났다. 셋째, 레플리카에 대한 긍정적 소비감정은 재구매의도에 정(+)의 영향을 미치며, 부정적 소비감정은 부(-)의 영향을 미치는 것으로 나타났다. The present study purported to investigate the differences among replica purchase performance, consumer emotion, and repurchase intention in terms of demographic characteristics of professional sport audiences; and to verify the relationship of those factors. By employing a convenience sampling method, 294 survey responses were collected from who were wearing replicas on either professional baseball or football sites. An exploratory factor analysis was performed to verify the construct validity of the measurement of the present study, and also a Cronbach’s alpha coefficients were calculated to determine the internal consistency. Different statistical analyses including descriptive analysis, correlation, t-test, and one-way ANOVA were employed using the SPSS Win 21.0. The results were as followed: First of all, a significant difference was found between instrumental purchase performance and expressive purchase performance by gender but between consumption emotion and repurchase intention. By age, positive consumption emotion and negative consumption emotion was significantly different; however, purchase performance and repurchase intention were not different significantly. By different sports that they spectated, significant differences were found among instrumental purchase performance, positive and negative consumption emotions, and repurchase intention, but no difference found with expressive purchase performance. Second, expressive purchase performance for replicas affected positively on positive consumption emotion; however, instrumental purchase performance did not. both expressive and instrumental purchase performances affected negatively on negative consupmtion emotion. Last, positive consumption emotion affected positively on repurchase intention; however, negative consumption emotion did negatively.