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- 저자 : 황성환 ( Sung Hwan Hwang ) (검색결과 63 건)
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Phosphorus-Doped ZnO 나노로드의 열처리 효과
황성환,문경주,이태일,명재민,Hwang, Sung-Hwan,Moon, Kyeong-Ju,Lee, Tae Il,Myoung, Jae Min 한국재료학회 2013 한국재료학회지 Vol.23 No.5
An effect of thermal annealing on activating phosphorus (P) atoms in ZnO nanorods (NR) grown using a hydrothermal process was investigated. $NH_4H_2PO_4$ used as a dopant source reacted with $Zn^{2+}$ ions and $Zn_3(PO_4)_2$ sediment was produced in the solution. The fact that most of the input P elements are concentrated in the $Zn_3(PO_4)_2$ sediment was confirmed using an energy dispersive spectrometer (EDS). After the hydrothermal process, ZnO NRs were synthesized and their PL peaks were exhibited at 405 and 500 nm because P atoms diffused to the ZnO crystal from the $Zn_3(PO_4)_2$ particles. The solubility of the $Zn_3(PO_4)_2$ initially formed sediment varied with the concentration of $NH_4OH$. Before annealing, both the structural and the optical properties of the P-doped ZnO NR were changed by the variation of P doping concentration, which affected the ZnO lattice parameters. At low doping concentration of phosphorus in ZnO crystal, it was determined that a phosphorus atom substituted for a Zn site and interacted with two $V_{Zn}$, resulting in a $P_{Zn}-2V_{Zn}$ complex, which is responsible for p-type conduction. After annealing, a shift of the PL peak was found to have occurred due to the unstable P doping state at high concentration of P, whereas at low concentration there was little shift of PL peak due to the stable P doping state.
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ZnO 나노 막대 성장을 위한 기판층으로서 hexagonal β상 Ni(OH)<sub>2</sub> 나노 시트 합성 및 미세구조 분석
황성환,이태일,최지혁,명재민,Hwang, Sung-Hwan,Lee, Tae-Il,Choi, Ji-Hyuk,Myoung, Jae-Min 한국재료학회 2011 한국재료학회지 Vol.21 No.2
As a growth-template of ZnO nanorods (NR), a hexagonal $\beta-Ni(OH)_2$ nanosheet (NS) was synthesized with the low temperature hydrothermal process and its microstructure was investigated using a high resolution scanning electron microscope and transmission electron microscope. Zinc nitrate hexahydrate was hydrolyzed by hexamethylenetetramine with the same mole ratio and various temperatures, growth times and total concentrations. The optimum hydrothermal processing condition for the best crystallinity of hexagonal $\beta-Ni(OH)_2$ NS was determined to be with 3.5 mM at $95^{\circ}C$ for 2 h. The prepared $Ni(OH)_2$ NSs were two dimensionally arrayed on a substrate using an air-water interface tapping method, and the quality of the array was evaluated using an X-ray diffractometer. Because of the similarity of the lattice parameter of the (0001) plane between ZnO (wurzite a = 0.325 nm, c = 0.521 nm) and hexagonal $\beta-Ni(OH)_2$ (brucite a = 0.313 nm, c = 0.461 nm) on the synthesized hexagonal $\beta-Ni(OH)_2$ NS, ZnO NRs were successfully grown without seeds. At 35 mM of divalent Zn ion, the entire hexagonal $\beta-Ni(OH)_2$ NSs were covered with ZnO NRs, and this result implies the possibility that ZnO NR can be grown epitaxially on hexagonal $\beta-Ni(OH)_2$ NS by a soluble process. After the thermal annealing process, $\beta-Ni(OH)_2$ changed into NiO, which has the property of a p-type semiconductor, and then ZnO and NiO formed a p-n junction for a large area light emitting diode.
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Though-silicon-via를 사용한 3차원 적층 반도체 패키징에서의 열응력에 관한 연구
황성환,김병준,정성엽,이호영,주영창,Hwang, Sung-Hwan,Kim, Byoung-Joon,Jung, Sung-Yup,Lee, Ho-Young,Joo, Young-Chang 한국마이크로전자및패키징학회 2010 마이크로전자 및 패키징학회지 Vol.17 No.1
Finite-element analyses were conducted to investigate the thermal stress in 3-dimensional stacked wafers package containing through-silicon-via (TSV), which is being widely used for 3-Dimensional integration. With finite element method (FEM), thermal stress was analyzed with the variation of TSV diameter, bonding diameter, pitch and TSV height. It was revealed that the maximum von Mises stresses occurred at the edge of top interface between Cu TSV and Si and the Si to Si bonding site. As TSV diameter increased, the von Mises stress at the edge of TSV increased. As bonding diameter increased, the von Mises stress at Si to Si bonding site increased. As pitch increased, the von Mises stress at Si to Si bonding site increased. The TSV height did not affect the von Mises stress. Therefore, it is expected that smaller Cu TSV diameter and pitch will ensure mechanical reliability because of the smaller chance of plastic deformation and crack initiation.
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황성환(Sung-hwan Hwang),권정택(Jeong-taik Kwon),박용숙(Yong-sook Park),민병국(Byung-kook Min) 대한두개저학회 2012 대한두개저학회지 Vol.7 No.1
Objective : We report a case of primary intracranial leiomyoma in 43-year-old woman. The radiologic examination was consistent with an extradural meningioma. After surgery, the tumor was diagnosed as leiomyoma. Case presentation : A 43-year-old woman presented complaining of headache and tinnitus for few months. On examination, there were no focal neurologic deficits. Magnetic resonance image(MRI) of the brain showed a well enhancing solid tumor in right posterior parietal convexity. Surgical resection was performed and histologic was leiomyoma. Conclusion : Primary intracranial leiomyoma is rare intracranial tumor, rarely have neurologic symptoms. The radiologic diagnosis was similar with meningioma. Leiomyoma should be considered in the differential diagnosis of well-circumscribed intracranial extraaxial lesions.
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위암 환자에서 p53 , DCC 및 nm23 유전자 변이의 발현 양상과 임상적 의의
황성환(Sung Hwan Hwang),오상훈(Sang Hoon Oh),최영길(Young Kil Choi) 대한소화기학회 2001 대한소화기학회지 Vol.38 No.5
Background/Aims: Multiple gene abnormalities are observed in gastric carcinogenesis. We analyzed the mutation of p53, DCC and nm23 genes in gastric carcinoma and evaluated their clinical significance. Methods: Mutations of p53, DCC and nm23 genes were investigated using PCR-SSCP analysis in 40 patients with gastric carcinoma. The correlations between mutations of these genes and clinicopathologic variables or prognosis were examined. Results: The incidence of mutation in the p53, DCC and nm23 genes were 47.5%, 30.0% and 25.0%, respectively. The mutation of the p53 genes significantly correlated with lymph node metastasis and lymphatic invasion. The mutation of the nm23 genes showed a significant correlation with tumor size, histologic type, depth of invasion, lymph node metastasis, and venous invasion. The mutation of the DCC genes had no correlation with clinicopathologic variables. The overall 5-year survival rate of the patients was 60.0%. The mutation of the p53 and nm23 genes significantly affected on survival of the patients, but mutation of the DCC genes did not. By multivariate analysis, the most significant prognostic factors were lymph node metastasis and depth of invasion. The mutation of p53, DCC, and nm23 genes had little prognostic value in gastric carcinoma. Conclusions: It is suggested that the mutation of the p53 and nm23 genes may have a role in the tumor invasion and metastasis in gastric carcinoma, possibly leading to a poor prognosis. (Korean J Gastroenterol 2001;38:325-335)
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