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Park, Se Jin,Jeon, Hyo Sang,Cho, Jin Woo,Hwang, Yun Jeong,Park, Kyung Su,Shim, Hyeong Seop,Song, Jae Kyu,Cho, Yunae,Kim, Dong-Wook,Kim, Jihyun,Min, Byoung Koun American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.49
<P>Significant enhancement of solution-processed CuInxGa1-x(Se,S)(2) (CIGSSe) thin-film solar cell performance was achieved by inducing a band gap gradient in the film thickness, which was triggered by the chalcogenization process. Specifically, after the preparation of an amorphous mixed oxide film of Cu, In, and Ga by a simple paste coating method chalcogenization under Se vapor, along with the flow of dilute H2S gas, resulted in the formation of CIGSSe films with graded composition distribution: S-rich top, In- and Se-rich middle, and Ga- and S-rich bottom. This uneven compositional distribution was confirmed to lead to a band gap gradient in the film, which may also be responsible for enhancement in the open circuit voltage and reduction in photocurrent loss, thus increasing the overall efficiency. The highest power conversion efficiency of 11.7% was achieved with J(sc) of 28.3 mA/cm(2), V-oc of 601 mV, and FF of 68.6%.</P>
UV 광산화 공정 및 광촉매 공정을 이용한 벤젠 및 톨루엔 가스의 처리
황철원,전보경,김찬훈,서정민,최금찬 동아대학교 환경문제연구소 2003 硏究報告 Vol.25 No.2
Volatile organic compounds (VOCs) are widely used in both industrial and domestic activities. This extensive use results in adverse effect in aquatic, soil and atmospheric environments. Conventional methods for treating VOCs from gas streams, such as absorption, adsorption, condensation and thermal /catalytic incineration all have their inherent limitations and none are definitely cost-effective to treat emissions from the small workplace such as architectural coating, printing, and dry cleaning. In this study, photooxidation-photocatalytic oxidation process was applied in the decomposition of VOCs and benzene and toluene, typical VOCs in industrial area, which were adapted as experimental gases. In photooxidation process, the decomposition efficiency of benzene and toluene was evaluated by varying different conditions, such as UV output, flowrate and background gas. The results showed that the decomposition efficiency of benzene and toluene increased considerably with increasing UV output and retention time. In case of background gas, the decomposition efficiency in standard air was higher than that in nitrogen. In photooxidation-photocatalytic oxidation process, the decomposition efficiency was higher than that in photooxidation process and the concentration of ozone generated from photooxidation reactor was drastically decreased after photocatalytic oxidation process. From this study, the results indicate that photooxidation-photocatalytic oxidation process is ideal for treatment of benzene and toluene from the small workplace. But further process optimization must be achieved to apply this process in workplace.
光波長이 오이(Cucumis sativus L.) 플러그苗의 生長에 미치는 影響
용영록,전지영,황세진,김일섭,정천순 강릉대학교 동해안지역연구소 2000 東海岸硏究 Vol.11 No.1
This research was carried to find out the optimum artificial light condition for plug seedling production of high quality cucumber through investigating growth response of the seedling by both light wave length and treatment period. The treatment with blue and red fluorescent lamp increased the fresh weight involving hypocotyl and root and controlled the elongation of hypocotyl, compared with other treatments. The 30-day-old seedling treatment with blue and red light for 12 hours showed that vegetative growth including root, stem and leaves was better than that of seedling treated with other lamps. Seedling under blue and red light for 12 hours grew 60.0mm and 0.55g in length and weight of hypocotyl. respectively, Hypocotyl length and weight were 44.9mm and 0.62g when seedling was grown under above light condition for 6 hours. Total chlorophyll contents of hypocotyl were highest in the light mixing treatment, and this accelerated greening. Morphological characteristics by investigating cross and longitudinal section of 30-day-old cucumber seedling treated with the mixing fluorescent lamps indicated that epidrmis tissues were usually single layer and thicker, resulting in small, compact and non-intercellular spaces of cells. On the other hand, epidermis tissues of the control composed of large, longer and round cells and cortex tissues showed large intercellular spaces between cells. Longitudinal section of photo-treated hypocotyl showed that there were more shorter cells and non-intercellular spaces of cells than untreated tissues. As a result, blue and red light mixing treatment controled the cell elongation of seedling hypocotyl, resulting in shortening hypocotyl of cucumber seedling.
李應昊,金世權,錢重均,金洙賢,金程均 釜山水産大學校 1982 釜山水産大學 硏究報告 Vol.22 No.1
멸치젓의 呈味成分에 관한 기초자료를 얻고자 생멸치와 이를 原料로 하여 제조된 멸치젓 중의 核酸關聯物質, 유리아미노산, betaine, TMAO, TMA 및 總creatinine을 分析하였다. 核酸關聯物質 중 생멸치에서는 IMP가 乾物量基準으로 2.8 μmole/g로 가장 많았으나 멸치젓에서는 hypoxanthine이 4.2 μmole/g으로 가장 많았고 , ATP는 흔적량에 불과 하였다. 멸치젓 중의 유리아미노산 중 함량이 많은 것은 leucine, isoleucine, phenylalanine, lysine, tyrosine, alanine, histidine, valine, methionine의 順이었고 glycine, proline, glutamic acid, arginine, threonine, serine 등은 함량이 적었다. 그리고 全유리아미노산은 젓갈 숙성중생원료에 비하여 약 2배로 增加 하였다. Betaine 은 생멸치 및 멸치젓 중에 各各 10.2㎎/100g, 30.0㎎/100/g였으며 이들이 엑스分室素에 대한 比率은 各各 0.6% 및 1.2%였다. TMAO 含量은 생멸치가 13.9㎎/100g, 멸치젓이 9.0㎎/100g였으며 TMA 含量은 各各 22.7㎎/100g 및 30.9㎎/100g였다. 總 creatinine 含量은 생멸치 및 멸치젓에서 各各 433.1㎎/100g, 575.8㎎/100g로서 엑스分室素에 대해 27.2% 및 22.8%였다. Omission test 結果 멸치젓의 呈味成分으로서는 유리아미노산 및 核酸關聯物質이 중요한 구실을 한다는 것을 알았다. This study was conducted to evaluate the taste compounds of fermented anchovy. The contents of such compounds as nucleotides and their related compounds, free amino acids, betaine, TMAO and total creatinine raw and fermented anchovy were analysed. The contents of IMP in raw anchovy appeared higher than other nucleotides and tended to decrease rapidly during fermentation. Therefore, in the case of fermented anchovy, hypoxanthine was abundant and IMP was very low in content. In the free amino acid composition of fresh samples abundant amino acids were leucine, isoleucine, phenylalanine, lysine, tyrosine, alanine, histidine, valine, methionine in order. Such amino acids as glycine, proline, glutamic acid, arginine, threonine and serine were poor in content. The contents of total free amino acids reached approximately about two times as compared with that of raw sample. The amount of betaine and TMA increased, while TMAO decreased during fermentation. The content of total creatinine in raw and fermented anchovy was occupied 22.8% and 27.2% of total of extractive nitrogen, respectively. As the results of omission test, the taste-active compounds of fermented anchovy are assumed to be free amino acids and nucleotides.
Metal-supported high crystalline Bi<sub>2</sub>Se<sub>3</sub> quintuple layers
Jeon, Jeong Heum,Jang, Won Jun,Yoon, Jong Keon,Kahng, Se-Jong IOP Pub 2011 Nanotechnology Vol.22 No.46
<P>Atomically flat thin films of Bi<SUB>2</SUB>Se<SUB>3</SUB> were grown on Au(111) metal substrate using molecular beam epitaxy. Hexagonal atomic structures and quintuple layer steps were observed at the surfaces of grown films using scanning tunneling microscopy. Multiple sharp peaks from (003) family layers were characterized by x-ray diffraction measurements. The atomic stoichiometry of Bi and Se was considered using x-ray photoemission spectroscopy. Moiré patterns were obtained at the surfaces of one quintuple layer films due to lattice mismatch between Bi<SUB>2</SUB>Se<SUB>3</SUB> and Au. Our experiments suggest that Au is a reasonable material for electrodes in Bi<SUB>2</SUB>Se<SUB>3</SUB> devices. </P>
Hamh, Sun Young,Park, Soon-Hee,Han, Jeongwoo,Jeon, Jeong Heum,Kahng, Se-Jong,Kim, Sung,Choi, Suk-Ho,Bansal, Namrata,Oh, Seongshik,Park, Joonbum,Kim, Jun Sung,Kim, Jae Myung,Noh, Do Young,Lee, Jong Seo Springer US 2015 NANOSCALE RESEARCH LETTERS Vol.10 No.1
<P>We investigate the surface states of topological insulator (TI) Bi<SUB>2</SUB>Se<SUB>3</SUB> thin films grown on Si nanocrystals and Al<SUB>2</SUB>O<SUB>3</SUB> substrates by using terahertz (THz) emission spectroscopy. Compared to bulk crystalline Bi<SUB>2</SUB>Te<SUB>2</SUB>Se, film TIs exhibit distinct behaviors in the phase and amplitude of emitted THz radiation. In particular, Bi<SUB>2</SUB>Se<SUB>3</SUB> grown on Al<SUB>2</SUB>O<SUB>3</SUB> shows an anisotropic response with a strong modulation of the THz signal in its phase. From x-ray diffraction, we find that the crystal plane of the Bi<SUB>2</SUB>Se<SUB>3</SUB> films is inclined with respect to the plane of the Al<SUB>2</SUB>O<SUB>3</SUB> substrate by about 0.27°. This structural anisotropy affects the dynamics of photocarriers and hence leads to the observed anisotropic response in the THz emission. Such relevance demonstrates that THz emission spectroscopy can be a sensitive tool to investigate the fine details of the surface crystallography and electrostatics of thin film TIs.</P>
Se-Beom Jeon,Youngbae Jeon,Kyoung-Won Han,Yong-Soon Chun,Jeong-Heum Baek 대한종양외과학회 2021 Korean Journal of Clinical Oncology Vol.17 No.1
Purpose: This study aimed to investigate the clinical outcomes after totally implantable access port (TIAP) implantation performed by general surgery residents in patients with colorectal cancer. Methods: A total of 291 consecutive patients who underwent TIAP implantations were evaluated. The patients were divided into three groups: second-, third-, and fourth-grade residents. Results: The mean follow-up was 22.1 months (range, 1–87 months). The total times of operation, puncture, and cannulation decreased as the resident grade increased (P<0.001). Early complications significantly decreased with higher resident grades (P=0.039). The non-use of ultrasonography and non-use of C-arm were identified as independent risk factors for complications. Resident grades between second and third (P=0.005) and between second and fourth (P=0.041) were identified as independent risk factors for optimal tip position. Conclusion: TIAP implantation can be safely and effectively performed by residents. Low-grade residents were associated with early complications.
Study of fibroblast growth factor 2 administration in bleomycin induced pulmonary fibrosis mice
Se Bi Lee,Hyeokku Lee,Jungyu Baek,Eunhyeok Choi,Hyunseung Lee,Juhyeok Hong,Jaehyun Kim,Jeong Yun Park,Gichang Jeong,Jieun Jeon,Jooyeon Lee,Jaehyun Park,Jimin Jang,Sang-Ryul Cha,Se-Ran Yang 한국실험동물학회 2023 한국실험동물학회 학술발표대회 논문집 Vol.2023 No.2