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Jung, Sang-Mok,Kang, Seul-Gi,Kim, Kwang-Tae,Lee, Han-Joo,Kim, A-Reum,Shin, Hyun-Woung Korean Society of Environment and Ecology 2015 한국환경생태학회지 Vol.29 No.1
In this study, the proximate composition of Pyropia dentata was compared by the analysis of minerals and amino acids that were produced at Seocheon, Chungcheongnam-do and at Wando and Jangheung, Jeollanam-do. Moisture, ash and crude proteins were analyzed using the AOAC method, and crude lipid was analyzed using the Soxhlet method, and inorganic analysis was performed using ICP-OES. Amino acid was used for the amino acid analyzer. The proximate composition analysis, moisture content, maximum values were displayed in Wando while the maximum content of ash appeared at Jangheung's Pyropia. Crude proteins was appeared at Seocheon's Pyropia and the maximum amount of crude lipid, carbohydrate was appeared in Wando's Pyropia. Inorganic analysis, calcium, potassium, magnesium, sodium, phosphorus, cobalt, chromium, copper, iron, manganese, nickel, zinc were analyzed from the Seocheon's Pyropia, however, cobalt, chromium, and nickel was not detected in Wando's Pyropia. For amino acid analysis, a total of 17 amino acids were detected: leucine, valine, aspartic acid, glutamic acid, and the amount of alanine accounted for about 57 % of total amino acids(26.1-28.7 %). The proximate composition, minerals, and amino acid of Pyropia dentata were different depending on the coastal ecological habitats.
Screening and identification of bioorganic light-emitting substances from marine macrophytes
Sang Mok Jung,Han Seong Lee,Han Joo Lee,Seul Gi Kang,Ji Su Son,Jae Hyuk Jeon,Hee Baik Chae,Hyun Woung Shin 한국조류학회I 2015 ALGAE Vol.30 No.2
Organic light-emitting materials in marine macrophytes from various coastal environments were identified. Twentyeight species from the solvent fractions were examined and identified as candidates for bioorganic light-emitting materials using photoluminescence (PL) spectra and gas chromatography-mass spectrometry. We selected 16 solvent fractions from a total of 1,221 prepared from Ishige okamurae, Sargassum confusum, Grateloupia elliptica, Chondracanthus intermedius, Porphyra yezoensis, Meristotheca papulosa, Gelidium amansii, and Scytosiphon lomentaria. The maximum light-emitting PL spectra appeared at various colors, mainly between blue and green, based on chromaticity coordinates, from solvent fractions of M. papulosa, G. amansii, G. elliptica, P. yezoensis, S. lomentaria, I. okamurae, and C. intermedius. These results will contribute to the development of novel organic light-emitting materials.
Design and fabrication of multi-layer antireflection coating for III-V solar cell
Sung-Mok Jung,김영환,김성일,유상임 한국물리학회 2011 Current Applied Physics Vol.11 No.3
ZnS and ZnS―MgF_2 composite films were prepared on soda-lime glass substrates and MgF_2 films on GaAs by rf magnetron sputtering to investigate multi-layer antireflection (AR) coatings. Optical constants of these films were determined by envelope method and spectroscopic ellipsometry. In particular, ZnS―MgF_2 composite films were fabricated by co-sputtering of ZnS and MgF_2 target to obtain intermediate refractive index material for a middle layer in the triple-layer AR coating and these films exhibited the desired intermediate refractive index. Based on the extracted optical constants, single-, double- and triple-layer AR coatings on GaAs substrates were designed and fabricated by rf magnetron sputtering. Low reflectance could be obtained from single-layer AR coating only at a specific wavelength and could be obtained from multi-layer AR coating at wide wavelength regime. Additionally, incident angle dependence of the reflectance of the multi-layer AR coatings was also investigated and showed different behavior according to a number of layers.
Characteristics of transparent conducting Al-doped ZnO films prepared by dc magnetron sputtering
Jung, Sung-Mok,Kim, Young-Hwan,Kim, Seong-Il,Yoo, Sang-Im Elsevier 2011 CURRENT APPLIED PHYSICS Vol.11 No.1
<P><B>Abstract</B></P><P>Al-doped ZnO (AZO) films were deposited on soda-lime glass substrates by using dc magnetron sputtering as a function of argon gas pressure, O<SUB>2</SUB>/Ar gas ratio and substrate temperature, and their electrical and optical properties were investigated. As a result, the resistivity of the AZO films decreased with decreasing argon gas pressure or O<SUB>2</SUB>/Ar gas ratio. However, the lowest resistivity could be obtained at the substrate temperatures of 250 °C. The higher substrate temperature increased the resistivity a little. The transmittance was found to be very sensitive to O<SUB>2</SUB>/Ar gas ratio and substrate temperature. Addition of a very small amount of oxygen to argon (1.23% of O<SUB>2</SUB>/Ar ratio) or slight increase of the substrate temperature from room temperature to 150 °C enhanced the transmittance in visible region remarkably. Conclusively, the AZO films with low resistivity of order of 10<SUP>−4</SUP> Ω cm and high transparency in visible region could be prepared at the substrate temperatures of above 150 °C (the lowest resistivity of 3.19 × 10<SUP>−4</SUP> Ω cm at 250 °C) by dc magnetron sputtering and these films are applicable to various fields which require transparent conducting oxide films.</P>
Sung-Mok Jung,김영환,유상임,Suk-Kyoung Hong,Yong Tae Kim 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
Bi3.15Nd0.85Ti3O12 (BNT) thin films were fabricated on Si (100) substrates with Al2O3 buffer layer by a sol-gel method to investigate the effect of a thermal annealing process for crystallization of BNT thin films on the C-V characteristics of the MFIS structures. From XRD results, a BNT thin film with a thickness of 150 nm was found to be sufficiently crystallized by annealing at 650 C by using a RTA process. However, a higher annealing temperature and a longer holding time were needed to sufficiently crystallize the thicker BNT film (250 nm). These results imply that reducing film thickness is one of the ways to reduce the thermal budget for crystallization of ferroelectric films. All the Pt/BNT/Al2O3/Si structures, except the one with the BNT films annealed at 750 C in a furnace, showed clockwise C-V hysteresis, meaning the existence of a memory window resulting from ferroelectric polarization of the BNT film. The maximum memory window was obtained from the BNT film annealed at 650 C by RTA, and its value is 1 V at a sweep voltage of 6 V. The memory window decreased with increasing annealing temperature and/or thermal budget. This is thought to be due to poor interface properties induced by a higher annealing temperature and/or larger thermal budget.l
Relationship of serum lymphocyte with outcomes in chronic obstructive pulmonary disease
( Sung Woo Moon ),( Ah Young Leem ),( Young Sam Kim ),( Ji-hyun Lee ),( Tae-hyung Kim ),( Yeon Mok Oh ),( Sang Do Lee ),( Ji Ye Jung ),( Kold Study Group ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
Background: The role of lymphocyte in the patients with chronic obstructive pulmonary disease (COPD) remains unclear. The purpose of this study was to evaluate the effect of the serum lymphocyte on several clinical parameters, such as lung function, exercise capacity, QOL, exacerbation and mortality in a Korean COPD cohort by repeated and simultaneous measurement of the serum lymphocyte and these clinical parameters. Methods: The study population comprised 451 patients with COPD from the KOLD cohort. Serum lymphocyte percentage (%) were measured every year along with various clinical parameters such as lung function, 6-min walking (6MW) distance, quality of life (CAT and SGRQ score), exacerbations and survival. Serum lymphocyte percentage less than 20% is considered as low lymphocyte. Follow-up data up to 9 years was used for analysis. Results: Among the 451 patients, 409 (90.7%) and 42 (9.3%) were the normal lymphocyte group and low lymphocyte groups at the time of enrollment, respectively. Clustered analysis showed that low lymphocyte group showed lower post-bronchodilator FEV1 (estimated mean=-5.70 % predicted; P=0.001), lower FVC (estimated mean=-5.63 % predicted; P=0.005), shorter 6MW distance (estimated mean=-41.31m; P<0.001), higher CAT score (estimated mean=2.62; P=0.013), and higher SGRQ score (estimated mean=10.10; P<0.001). However, serum lymphocyte % was not associated with frequent acute exacerbation and mortality. Conclusions: Patients with low serum lymphocyte showed low pulmonary function, low 6MW distance, and worse quality of life. Lymphocyte may be related with various conditions in COPD.