In1-xGaxP/GaAs 이종접합 구조의 Photoreflectance 특성

배인호,김기홍,박성배,김인수,조광호 한국물리학회 2003 새물리 Vol.46 No.2

In$_{1-x}$Ga$_x$P/GaAs epilayers grown by using metalorganic chmical vapor deposition were investigated using photoreflectance (PR) measurements. We observed the bandgap transitions of the In$_{1-x}$Ga$_x$P/GaAs heterojunction. The band gap ($E_0$), the broadening parameter ($\Gamma$), and the internal electric field ($E_i$) were obtained from the observed Franz-Keldysh oscillation by using Aspnes' equation. The Ga composition ($x$=0.51) was determined from Robert's composition formula and by measuring the frequency dependence of the In$_{1-x}$Ga$_x$P/GaAs heterojunction, we were able to observe that the PR line shape did not change, but the amplitude did. This results was due to the difference between the lifetimes of the photocarriers in GaAs and in In$_{1-x}$Ga$_x$P. Good agreement between the experimental and the calculated values of the bandgap transition energies were found in the temperature range from 77 K to 300 K. Metalorganic chemical vapor deposition(MOCVD)법으로 성장한 In$_{1-x}$Ga$_x$P/GaAs 이종접합 구조의 특성을 비접촉, 비파괴법인 photoreflectance(PR) 방법으로 연구하였다. 실온에서, In$_{1-x}$Ga$_x$P/GaAs 이종접합 구조의 띠사이 흡수 전이에 대한 피크를 관측하여, PR 측정값을 3차미분형태로 피팅한 띠 간격 에너지($E_0$)값과 조성비($x$)로 구한 이론 값이 잘 일치하였다. 그리고 변조 주파수 의존성을 측정한 결과 PR 신호의 형태는 변하지 않고, 신호의 크기만 변하는 것은 광조사에 따른 전기적 상태의 과도 현상에 따른 것이고, In$_{1-x}$Ga$_x$P와 GaAs의 차이는 광 캐리어의 수명의 차이로 분석된다. 온도 의존성 측정으로 In$_{1-x}$Ga$_x$P/GaAs 이종접합 시료의 균일한 변형분포와 계면상태가 양호함을 알 수 있다.

고름물집건선에서 발생한 지도모양혀 1예

배인호,김민성,최훈,나찬호,신봉석 대한건선학회 2018 대한건선학회지 Vol.15 No.2

Geographic tongue is a chronic, inflammatory, and immune- mediated oral lesion of unknown etiology. It is characterized by serpiginous white areas around the atrophic mucosa, which alternation between activity, remission and reactivation at various locations gave the names benign migratory glossitis and wandering rash of the tongue. Psoriasis is a chronic inflammatory disease with frequent cutaneous involvement and an immunogenetic basis of great importance in clinical practice. The association between geographic tongue and psoriasis has been demonstrated in various studies. A 41-year-old woman presented with asymptomatic multiple various sized scaly vesicles, papules on the whole body and serpinginous white areas around the atrophic mucosa on the tongue. Biopsy was taken from the lesion and showed hyperkeratosis, subcorneal pustule and spongiform pustule of Kogoj, and perivascular lymphocytic infiltration. Based on clinical and histopathologic features, geographic tongue in pustular psoriasis was diagnosed. She treated with acitretin 20mg, topical triamcinolone acetonide for tongue and antihiatamines. Herein we report a rare case of geographic tongue in pustular psoriasis.

Morphological Property and In vitro Enzymatic Degradation of Modified Chitosan as a Scaffold

배인호,고정태,장원구,임현필,박상원,이광민,박영준,박인규,정명호 한국고분자학회 2011 Macromolecular Research Vol.19 No.12

Chitosan (CS) was proposed as a promising candidate scaffold for tissue engineering. However, some drawbacks of natural CS remain. The current study modified CS by conjugating thiol to CS polymer (Thio-CS) and substantiated its three-dimensional microstructure and physical properties such as swelling or degradation. The Thio-CS was obtained by CS modification using 2-iminothiolane-HCl (2-IT). Because of the formation of disulfide bonds between thiol moieties based on oxidation of the immobilized thiol groups of CS, Thio-CS exhibits in situ gelling properties according to the reducing amount of free thiol. The content of the thiol group was increased as the amount of 2-IT increased. The swelling test demonstrated that Thio-CS can absorb up to 3.5 times its weight of phosphate buffered saline within 1 h and that the pore size and amount significantly increased with incubation time. The Thio-CS enzymatic degradation rate according to velocity was investigated. The results showed that Thio-CS was more resistant to lysozyme as viscosity increased. Thio-CS sponges were fabricated using freezedrying. The lyophilized Thio-CS had a homogeneous honeycomb-like shape, and its pores were relatively smaller (<2 μm) than those of unmodified CS (>2 μm). These results suggest that Thio-CS might be a candidate regenerative therapeutic device.

MOS蓄電器 構造의 容量-電壓 特性

裵仁鎬 嶺南大學校府設 基礎科學硏究所 1983 基礎科學硏究 Vol.3 No.-

Al-Si MOS capacitor structure has been fabricated on oxidized surface, and the capacitance-voltage characteristics have been investigated at room temperature. In the reverse bias, the calculated values of the capacitance were found to be in a good agreement with the measured values. At large values of surface potential it is evident that total charge within semiconductor consists of the electrons in the inversion region. The density of surface state is estimated as 6.2×10"cm­² and found to be positive. This was explained by the effect of interfacial layer.

원통 기어로 구성된 다단 기어열의 기어비 분할법 개발

배인호,정태형 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.6

The existing methods to split overall gear ratio of the cylindrical multi-stage gear train have their own limitations to be used in practical design, and are also problematic to be implemented in a formalized algorithm. This paper proposes two types of new methods to find gear ratios best approximating the overall gear ratio. The proposed methods are quite general to be applied to the gear train having any number of stages, and offer a considerably good result in a very short time. The first method uses the random search method and the second one is based on the simulated annealing algorithm. The proposed algorithms are expected to be very useful not only as an independent program to split overall gear ratio, but also as a design sub-module for the integrated design system of multi-stage gear drives.

A Comprehensive Review of the Acne Grading Scale in 2023

배인호,곽준호,나찬호,김민성,신봉석,최훈 대한피부과학회 2024 Annals of Dermatology Vol.36 No.2

Acne is a common skin inflammator y condition that can significantly affect the patient’s quality of life. Therefore, accurate assessment scales are ver y important for treatment and management of acne vulgaris. This review article issues a comprehensive review of various acne severity assessment scales. In this text, the authors review the acne grading scales, such as the Pillsbur y scale, Cook’s acne grading scale, Leeds acne grading system, Global Acne Grading System, and investigator’s global assessment, etc. And we delve into the characteristics, advantages, limitations, and applicability of these scales. The acne grading scale to be developed in the future should be objective, accurate, comprehensive, easy to use, and applicable in a variety of clinics and research settings. Current technologies, such as artificial intelligence, could potentially contribute to the development of ideal acne grading scales that meet unmet needs.

Mechanical behavior and in vivo properties of newly designed bare metal stent for enhanced flexibility

배인호,임경섭,박준규,박대성,이소연,장은재,지미선,심두선,홍영준,안영근,박종춘,조정관,강정채,김인수,나재운,정명호 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1

In this study, our own stent designed by Chonnam National University Hospital (designated as CNUHstent) which is considered an elastic behavior as second trial was subjected to mechanical performancetests and in vivo histological analysis. Four commercialized stents (PROMUS ElementTM, Cypher1,Resolute Integrity, Xience PRIME) stents were employed as control. In the flat plate and compression testfor measuring radial force, the lowest (2.40 0.27 N) and moderate (31.27 4.84 N) performance wasshown in CNUH stent compared to others. On the other hand, In the 3-point bending test for measuringflexibility, CNUH stent showed the greatest flexibility (0.46 0.08 N) among competitors (range between0.66 0.03 in Cypher1 and 1.14 0.04 Resolute Integrity), In both foreshortening and recoil test, CNUHstent showed reasonable result (2.13 0.15% and 3.29 0.41%, respectively). However, histological analysisshowed that CNUH stent has any significant difference to Coroflex1 Blue BMS on various parameters. Although the radial force of CNUH stent was slightly lower than that of other products, it showed the greatestperformance in its flexibility. It can be utilized for developing drug-eluting stent as a basic structure.

A Refinement System for Medical Information Extraction from Text-based Bilingual Electronic Medical Records

배인호,김진상 대한의료정보학회 2008 Healthcare Informatics Research Vol.14 No.3

Objective: Applications to extract medical information from electronic medical records(EMRs) confront some serious obstacles such as spelling errors, ambiguous abbreviations, and unrecognizable words. Those obstacles hinder the process of finding medical entities, relations, and events. We present an efficient EMR refinement system for the purpose of medical information extraction from EMRs, not just for traditional text error correction. Methods: The EMR refinement system has been designed and implemented through following steps: 1) Build domain constrained dictionary database, 2) Correct spelling errors in Korean-English EMR documents, 3) Resolve ambiguous abbreviations in the bilingual documents. The resulting EMR documents are now machine readable and can be applied to various applications including information extraction. Result: Precision rate of the refinement system for spelling error correction is 80.4% and for disambiguating abbreviations/acronyms is 94.7%. Conclusion: We developed an EMR refinement system to correct spelling errors and resolve ambiguous abbreviations as well as unrecognizable words. Our system can enhance the reliability of medical records and contribute to develop further application systems in the field of text mining and information extraction.

Ⅲ-Ⅴ족 화합물 반도체에서의 Varshni 및 Bose-Einstein 계수 결정

이정열,김인수,배인호 嶺南大學校 基礎科學硏究所 1995 基礎科學硏究 Vol.15 No.-

The band gaps of the undoped semi-insulating and Si heavily doped n-GaAs(100) bulks were measured through photoreflectance spectra in the temperature range of 77 to 300K. Those values were fitted by least-square root method for Aspnes' theoretical equation, and determined from the observed Franz-Keldysh oscillation. Singularity, the Varshni equation and Bose-Einstein expression have been compared with the experimental results.

Al/n-Si Schottky Diode의 電氣的 特性

裵仁鎬 嶺南大學校附設 基礎科學硏究所 1981 基礎科學硏究 Vol.1 No.-

Schottky diodes have been fabricated on n-type silicon with aluminum and the thickness of the aluminum film is approximately 2,000Å. For electrical characterization of the devices, diode current-voltage characteristics were measured at various temperatures between 253 and 303°K, and capacitance versus voltage measurements were crried out at room temperature (290°K). The values of barrier height measured from the capacitance-voltage equal to 0.6595eV in good agreement with those deduced from current-voltage characteristics. The donor density, the width of the depletion layer, and image force dielectric constant were found to be ?? , 1,800Å, and ?? , and the Fermi level lies 0.300eV above the mid-gap.