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Nondestructive analysis of coated periodic nanostructures from optical data.
Ghong, T H,Han, S-H,Chung, J-M,Byun, J S,Kim, T J,Aspnes, D E,Kim, Y D,Park, I H,Kim, Y-W Optical Society of America 2010 Optics letters Vol.35 No.5
<P>Optical data are essential for the accurate nondestructive determination of profiles of periodic structures in integrated-circuit technology. In rigorous coupled-wave analysis, the sample is generally modeled as layers consisting of a single material and the ambient. We extend present capabilities to the analysis of structures with overlayers and demonstrate our approach by determining quantitatively the thicknesses of top, sidewall, and bottom oxides of deliberately and naturally oxidized structures.</P>
Roughness Analysis of the Critical Dimension by Using Spectroscopic Ellipsometry
T. H. Ghong,S.-H. Han,,J.-M. Chung,J.-M. Chung,Y. D. Kim,데이비드에스프네스 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.51
In semiconductor electronics applications, observation of the linewidth roughness (LWR) or the critical dimension roughness will become increasingly important. In this article, we study to analyze the roughness of a grating structure by using spectroscopic ellipsometry. A simple 1D patterned c-Si grating structure was measured from the zeroth-order diffraction response at a fixed angle of incidence, which result agreed with a theoretical prediction made by using a rigorous coupled-wave analysis (RCWA) calculation with an effective-medium approximation (EMA) for a structure with roughness.
Dielectric function and band gap study of ZnSe film
T. H. Ghong,김영동,윤재진,김태중,H. J. Kim,Y. C. Chang 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.-
We present the dielectric function of zinc-blende ZnSe film, which has been determined by vacuum ultraviolet spectroscopic ellipsometry whose spectral range is from 0.7 to 9.0 eV at room temperature. In this work, we focus on determining the critical point (CP) energies above 6 eV, where the dielectric function has significant noise, by numerically calculating the second derivative of the spectrum with respect to energy. We calculate the band structure of ZnSe by using density-functional theory based on linear augmented Slater-type orbitals. From a comparison of data and theory, we can identify the experimentally obtained CP transition energies as E0, E0+Delta0, E1, E1+Delta1, E2, E2+Delta2, E2', E0' and E0'+Delta0'+Delta0 in the 0.7 - 9 eV region.
Study of the Dielectric Function of ZnS by Spectroscopic Ellipsometry
T. H. Ghong,김태중,김영동,S. J. Kim,데이비드에스프네스,Y. D. Choi,Y-. M. Yu 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
We report the best room-temperature dielectric function data for zincblende-type ZnS from 3.7 to 6.0 eV, obtained by spectroscopic ellipsometry together with real-time assessment of overlayer removal. These data were extended to 9.0 eV (without chemical etching) using a variable-angle system. This permits the first detailed analysis of the $E_2$ band gap of ZnS, revealing 3 bandgaps in this spectral region
소포변이 갑상선유두암 진단에서 초음파검사와 수술 중 동결절편 검사의 역할
공병호(Byeong Ho Ghong),김동주(Dong Ju Kim),이옥준(Ok Jun Lee),박진우(Jin Woo Park) 대한갑상선-내분비외과학회 2016 The Koreran journal of Endocrine Surgery Vol.16 No.3
Purpose: The follicular variant of papillary thyroid carcinoma (FVPTC) is the most common variant of papillary thyroid carcinoma (PTC). Preoperative diagnosis of FVPTC is often confused with cPTC, follicular neoplasm (FN), and benign follicular lesion because of the paucity of nuclear changes of PTC and overlapping features with benign and other neoplastic follicular lesions. The aim of this study is to elucidate whether ultrasonography and/or intraoperative frozen section analysis (FSA) have a supplementary role in the diagnosis of FVPTC. Methods: Fifty-five patients diagnosed with histologically confirmed FVPTC from January 2007 to December 2013 were identified. All patients had undergone either lobectomy with/without completion thyroidectomy or total thyroidectomy. Medical records, final histological reports and sonographic (US) findings were reviewed. All sonographic images, 53 fine needle aspiration cytology (FNAC) slides, and FSA slides for 24 cases were available for reexamination. Results: Three histologic types of FVPTC were identified: encapsulated (n=39); infiltrative (n=15); and diffuse (n=1). There were two distinct sonographic patterns: FN-type (n=28) and PTC-type (n=27). The encapsulated type is more common in the FN-like pattern, compared to the PTC-like one (85.7% vs. 55.6%, P=0.009). Among the 24 cases in which sonographic images and FNAC and FSA slides were available for review, six cases (25%) were diagnosed as either FN in FNAC and suspicious PTC(R/O PTC)/PTC in FSA or R/O PTC/PTC in FNAC and FN in FSA. Among those 24 cases described above, 13 cases (54.2%) were diagnosed as either FN-type in US and R/O PTC/PTC in FNAC/FSA or PTC-type in US and FN in FNAC/FSA. Conclusion: It is difficult to make a correct diagnosis of FVPTC before definitive treatment even with US, FNAC and FSA. However the possibility of FVPTC must be considered, especially when diagnoses in US, FNAC and FSA are different and include R/O PTC/PTC and FN in the same case.
임상적으로 중심구역 림프절 전이가 의심되지 않는 환자에서 중심구역 림프절 절제술의 필요성에 대한 고찰
공병호(Byeong Ho Ghong),박진우(Jin Woo Park),방승욱(Seung Uk Bang),김동주(Dong Ju Kim) 대한갑상선-내분비외과학회 2016 The Koreran journal of Endocrine Surgery Vol.16 No.3
Purpose: Although papillary thyroid microcarcinoma (PTMC) has very excellent prognosis, lymph node metastases are found frequently. This study identifies the risk factors of clinically negative cervical lymph node metastasis (cN0) and investigates the need for central lymph node dissection in cN0 PTMC. Methods: From Jan. 1st 2007 to Dec. 30th 2013, 1593 patients received surgery for papillary thyroid carcinoma. Seven hundred and eleven patients were diagnosed with cN0 PTMCs. They all received thyroidectomy (total thyroidectomy or lobectomy) with prophylactic central neck dissection. We reviewed the medical records and analyzed the risk factors affecting central lymph node metastasis (CLNM). Results: Of 711 PTMCs patients without clinical lymph node metastasis, 170 (23.9%) patients had CLNM. CLNM was frequent in males than females (P<0.001). The larger the primary tumor, the higher the risk of CLNM (P<0.001). Extra-thyroidal extension was an independent risk factor of CLNM (P<0.001). Recurrence rates in the CLNM negative group was 1.3%, and in the CLNM positive group 2.4%. The CLNM positive group recurred at a slightly higher rate, but not statistically significantly (P=0.329). Five year disease free survival in the CLNM negative was 96.8%, and in the positive group 94.1%, not a statistically significant (P=0.630). Conclusion: In this study, male gender, the size of primary tumor, and extra-thyroidal extension were the risk factors of occult LNM but occult LNM in PTMC was not associated with recurrence rate or five-year disease free survivals. Therefore, we can omit prophylactic central lymph node dissection in patient with cN0 PTMC.