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Synthesis of 2-Aminothiazole derivatives
Park,Seung Un 建國大學校基礎科學硏究所 1989 理學論集 Vol.14 No.-
새로운 Aminothiazole 유도체인 2-amino-4-methoxyiminoethyl-5-carbomethoxythiazole을 2, 3-butanedione monoxime을 출발물질로 하여 4단계의 합성과정을 거쳐서 출발물질로부터 약 20%의 수율로 합성하였다. 중간 생성물들의 구조는 핵자기 공명 분광법을 이용하여 확인하였으며, 또 각각의 반응에 대하여 검토하였다. A new aminothiazole derivative, 2-amino-4-methoxyiminoethyl-5-carbomethoxythiazole, was synthesized in 4 steps from 2, 3-butanedione monoxime as a starting material in ca. 20% overall yield. In this multi-step synthesis the structures of intermediates were identified using H-NMR spectroscopy, and some details of reactions were also discussed.
Electrical properties of single nitro oligophenylene ethynylene (OPE) molecule by using UHV STM
Seung-Un Kim,Byoung-Sang Kim,Jae-Chul Park,Hoon-Kyu Shin,Young-Soo Kwon 한국물리학회 2006 Current Applied Physics Vol.6 No.4
Self-assembled monolayers (SAMs) are ordered molecular structures formed by the adsorption of an active surfactant on a solidsurface. A SAM lm can be deposited on a substrate surface simply by exposing the surface to an environment containing surface-active molecular species for a certain period of time (solution or vapor phase deposition). The molecules will be spontaneously ori-ented toward the substrate surface and form an energetically favorable ordered layer. During this process, the surface-active headgroup of the molecule chemically reacts with and chemisorbs onto the substrate. In this paper, we conrmed the electrical propertiesof 404-di(ethynylphenyl)-20-nitro-1-benzenethiolate, which have been well known as a conducting molecule having possible applica-tion to molecular level negative dierential resistance (NDR) device. To deposit the self-assembly monolayers onto the gold elec-trode, we transfer the prefabricated Au(11) substrates into 0.5 mM self-assembly molecule in THF solution. Then, wemeasured electrical properties and surface morphologies 404-di(ethynylphenyl)-20-nitro-1-benzenethiolate using ultra-high vacuumscanning tunneling microscopy (UHV STM). Currentvoltage curves also showed several peaks between negative and positiveregion.
Degradation Evaluation of 2.25Cr-1Mo Steel Using Nondestructive Method
Park, Jong Seo,Baek, Un Bong,Kim, Jeong Min,Nahm, Seung Hoon,Ahn, Bong Young Trans Tech Publications, Ltd. 2005 Key Engineering Materials Vol.297 No.-
<P>Several nondestructive evaluation methods were attempted for the estimation of the creep damage of degraded 2.25Cr-1Mo steel. The specimens of three different aging periods were prepared by an isothermal heat treatment at 430°C, 482°C, and 515°C. The effect of probe configuration on the electrical resistivity was studied. Single configuration method and dual-configuration method were utilized for measuring electrical resistivity. The electrical resistivity was determined by a standard DC four-point probe method at 24±0.5°C. Indentation test, magnetic characteristics test and ultrasonic test were carried out to investigate the correlation between the major characteristics and aging parameter. Unlike the electrical resistivity characteristics, ultrasonic attenuation coefficient and indentation characteristics did not show a relation to Larson-Miller parameter. However, a correlation between the electrical resistivity and aging parameter was identified, which allows one to estimate the extent of material degradation.</P>
Validity of diagnostic codes for identification of psoriasis patients in Korea
( Seung Pil Ham ),( Jae Hong Oh ),( Hee Jae Park ),( Jong Uk Kim ),( Ho Young Kim ),( So Young Jung ),( Sun Young Choi ),( Jung Eun Seol ),( Hyojin Kim ),( Myoung Shin Kim ),( Un Ha Lee ),( Mira Choi 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.2
Background: Recently, nationwide medical research of psoriasis using National Health Insurance Service database is increasing. However, identification of psoriasis using diagnostic codes alone can lead to misclassification. Accuracy of the diagnostic codes and concordance with electronic medical records should be validated to identify psoriasis patient Objectives: To validate the diagnostic codes of psoriasis (ICD-10 L40) and to find algorithm for identification of psoriasis Methods: We collected medical records of patients who got their first diagnostic codes of psoriasis during 5 years (2012-2016) from five hospitals. 15 percent of patients were randomly selected at each hospital. Patients were classified as psoriasis, not psoriasis, and questionable for final diagnosis. We validated several algorithms to identify psoriasis Results: Total 538 cases were reviewed and classified as psoriasis (n=368), not psoriasis (n=159), and questionable (n=11). The most accurate algorithm was including patients with primary diagnostic codes of psoriasis and prescription of vitamin D derivatives. Positive predictive value was 96.5% (95% CI, 93.9~98.1%) which were significantly higher than including patients with psoriasis diagnostic codes alone (p=0.002, 96.5% vs. 91.0%). Sensitivity was 90.8% (95% CI, 87.2~93.4%) and specificity was 92.4% (95% CI, 86.9~95.9%) Conclusion: Our study demonstrates validated algorithm to identify psoriasis which is useful for the nationwide population based study for psoriasis
Determination of Pentapeptide Repeat Units in Qnr Proteins by the Structure-Based Alignment Approach
Park, Kwang Seung,Lee, Jung Hun,Jeong, Da Un,Lee, Jae Jin,Wu, Xing,Jeong, Byeong Chul,Kang, Choong-Min,Lee, Sang Hee American Society for Microbiology 2011 Antimicrobial agents and chemotherapy Vol.55 No.9
<B>ABSTRACT</B><P>The Qnr proteins belong to the pentapeptide repeat protein family. Despite each pentapeptide repeat unit being an important structural determinant, accurately determining pentapeptide repeat units in the Qnr proteins through sequence-based alignments has been challenging. In the present study, the pentapeptide repeat units of the nine representative Qnr proteins have been precisely determined via the structure-based alignment approach using homology modeling and superposition of their best models.</P>
( Seung-yong Lee ),( Narayan Chandra Paul ),( Won Park ),( Gyeong-dan Yu ),( Jin-cheon Park ),( Mi-nam Chung ),( Sang-sik Nam ),( Seon-kyeong Han ),( Hyeong-un Lee ),( San Goh ),( Im Been Lee ),( Jung 한국균학회 2019 韓國菌學會誌 Vol.47 No.4
A common post-harvest disease of sweetpotato tuber is root rot caused by Fusarium solani in Korea as well as the other countries. Storage root rot disease was monitored earlier on sweetpotato (Ipomoea batatas) in storehouses of different locations in Korea. In the present study, an isolate SPL16124 was choosen and collected from Sweetpotato Research Lab., Bioenergy Crop Research Institute, NICS, Muan, Korea, and confirmed the identification as Fusarium solani by conidial and molecular phylogenetic analysis (internal transcribed spacer ITS and translation elongation factor EF 1-α gene sequences). The isolate was cultured on potato dextrose agar, and conidiation was induced. The fungus was screened for Fusarium root rot on tuber of 14 different varieties. Among the tested variety, Yenjami, Singeonmi, Daeyumi, and Sinjami showed resistant to root rot disease. Additionally, the pathogen was tested for pathogenicity on stalks of these varieties. No symptom was observed on the stalk, and it was confirmed that the disease is tissue specific.