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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>
송동철,Ji Hwan Lee,Kangheung Kim,오한진,Jae Woo An,Se Yeon Chang,조현아,Sehyun Park,Kyeongho Jeon,Yohan Yoon,유윤정,Younghyun Cho,Jin Ho Cho 한국축산학회 2023 한국축산학회지 Vol.65 No.3
Escherichia coli (E. coli) and Salmonella enterica (SE) infections in pigs are major source associated with enteric disease such as post weaning diarrhea. The aim of this study was to investigate the effects of Pediococcus pentosaceus in weaned piglets challenged with pathogen bacteria. In Experiment.1 90 weaned piglets with initial body weights of 8.53 ± 0.34 kg were assigned to 15 treatments for 2 weeks. The experiments were conducted two trials in a 2 × 5 factorial arrangement of treatments consisting of two levels of challenge (challenge and non-challenge) with E. coli and SE, respectively and five levels of probiotics (Control, Lactobacillus plantarum [LA], Pediococcus pentosaceus SMFM2016-WK1 [38W], Pediococcus acidilactici K [PK], Lactobacillus reuteri PF30 [PF30]). In Experiment.2 a total of 30 weaned pigs (initial body weight of 9.84 ± 0.85 kg) were used in 4 weeks experiment. Pigs were allocated to 5 groups in a randomized complete way with 2 pens per group and 3 pigs per pen. Supplementation of LA and 38W improved (p < 0.05) growth performance, intestinal pathogen bacteria count, fecal noxious odor and diarrhea incidence. In conclusion, supplementation of 38W strains isolated from white kimchi can act as probiotics by inhibiting E. coli and SE.
김세권,최진삼,이창국,변희국,전유진,이응호,박인용 대전산업대학교 반도체기술연구소 1999 半導體技術硏究所報 Vol.1 No.-
참치 뼈에서 추출한 hydroxyapatite를 출발물질로 여러 가지 세라믹 복합체를 제조하여 인공체액에서의 hydroxyapatite 복합체간의 화학결합을 조사하였다. hydroxyapatite 복합체들은 인공체액에서 4주 후부터 화학 결합성질을 나타내었다. 결합강도는 bioglass가 가장 강하게 나타났으며, 조성에 따른 의존성은 관찰할 수 없었다. 인공체액에서 복합체들은 이들의 경계면에서 불균일 핵생성 및 성장에 의해 화학적 결합으로 이루어졌다. Chemical bonding was investigated in the simulated body fluid of several selected hydroxyapatite-containing composites. The hydroxyapatite-containing composites chemically bonded with each other in the simulated body fluid after 4 weeks. Bioglass was strongly bonded in the simulated body fluid, but bonding strength was not depended on composition. Their composite bodies were chemically bonded by heterogeneous nucleation and growth at the interfaces of the specimens in the simulated body fluid.
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.
이강석,전헌수,이아름,정세교,배선민,조동완,옥진은,김경화,양민,이삼녕,안형수,배종성,하홍주,Lee, Gang-Seok,Jeon, Hun-Soo,Lee, Ah-Reum,Jung, Se-Gyo,Bae, Seon-Min,Jo, Dong-Wan,Ok, Jin-Eun,Kim, Kyung-Hwa,Yang, Min,Yi, Sam-Nyeong,Ahn, Hyung-Soo 한국결정성장학회 2010 한국결정성장학회지 Vol.20 No.3
높은 광흡수 계수를$(1{\times}10^5cm^{-1})$ 가지는 CIGS는 Ga의 비율에 따라서 밴드갭을 조절할 수 있다는 장점을 지니고 있다. CIGS의 밴드갭은 Ga의 비율에 따라 $CuInSe_2$(Eg: 1.0 eV)에서 $CuGaSe_2$(Eg: 1.68 eV)까지의 범위에 존재하며, 태양전지에 서 이상적인 fill factor 모양을 가지도록 Ga의 비율을 높게 조성한다. CIGS 흡수층을 제작하는 방법에는 co-evaporator 방식이 가장 널리 사용되며 연구되고 있다. 이에 본 연구에서는 수평 형태의 hydride vapor transport (HVT)법을 고안하여 CIGS 나노 구조 및 에피성장을 시도하였다. HVT법은 $N_2$ 분위기에서 원료부의 CIGS 혼합물을 HCl과 반응시켜 염화물 기체상태로 변환 후 growth zone까지 이동하여 성장을 하는 방식이다. 성장기판은 c-$Al_2O_3$ 기판과 u-GaN을 사용하였다. 성장 후 field emission scanning electron microscopy(FE-SEM)과 energy dispersive spectrometer(EDS)를 이용하여 관찰하였다. The Cu$(In_{1-x}Ga_x)Se_2$ is the absorber material for thin film solar cell with high absorption coefficient of $1{\times}10^5cm^{-1}$. In the case of CIGS, the movable energy band gap from $CuInSe_2$ (1.00 eV) to $CuGaSe_2$ (1.68 eV) can be acquired while controlling Ga contain ratio. Generally, the co-evaporator method have used for development and fabrication of the CIGS absorption layer. However, this method should need many steps and lengthy deposition time with high temperature. For these reasons, in this paper, a new growth method of CIGS layer was attempted to hydride vapor transport (HVT) method. The CIGS mixed-source material reacted for HCl gas in the source zone was deposited on the substrate after transporting to growth zone. c-plane $Al_2O_3$ and undoped GaN were used as substrates for growth. The characteristics of grown samples were measured from SEM and EDS.
Transfer Lengths in Pretensioned Concrete Measured Using Various Sensing Technologies
Se-Jin Jeon,Ho Shin,Sang-Hyun Kim,Sung Yong Park,Jun-Mo Yang 한국콘크리트학회 2019 International Journal of Concrete Structures and M Vol.13 No.6
Although pretensioned concrete structures have increasingly been used worldwide, a number of design issues need to be addressed to further improve the structural performance. Transfer length of pretensioned members was investigated with several test variables in this study by adopting various sensing technologies including the Smart Strands with embedded fiber optic sensors. The effect of increased strength in 2360 MPa high-strength strand on the transfer length was also analyzed. Representative provisions widely used in design were compared with the test results for consistency and appropriate conservatism. The strain distribution required for the transfer length depended partly on the type and location of sensors, which suggests the challenges associated with reasonable determination of the transfer length. According to the results of the analysis, the predictive equation in ACI 318 was relatively accurate and conservative under various conditions including high-strength strands. However, the transfer lengths based on the strand strains rather than the conventional surface strains of concrete require further investigation depending on the bonding behavior between the strand and the surrounding concrete inside a member. Thus, this study also introduces a new sensing technology utilizing the Smart Strand to reliably measure the strain distribution along a strand.
Jin Hwan Jeon,Gi-Hun Kim,Chang won Jang,Se Jin Jeong,E-Hyun Shin,Young-Ran Ju,Kyu-Sik Chang 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.10
Haemaphysalis longicornis is a major vector for Severe fever with thrombocytopenia syndrome (SFTS) throughout Republic of Korea (ROK). The ticks distribute at vast open fields and various kind of habitate. Control of the ticks with pesticides is almost impossible and personal protection such as use of commercial repellents is very critical for control. However occasional toxic effects of the commercial repellents have been reported that include central nervous system depression and urticaria. In our studies, repellency of three plant essential oils was assessed and was compared with two commercial repellents. Lavendual angustifolia demonstrated the highest repellency and higher repellency than DEET when was individually tested, but binary mixture of Cinnamomum zeylinicam and Juniperus verginiana showed significantly higher repellency with synergic effects than mixture of Lavendula angustifolia and Juniperus verginiana. Further study on repellency of the C. zelinicam in field need.
( Se Woo Park ),( Won Joong Jeon ),( Jin Dong Kim ),( Sang Jin Lee ),( A Ra Choi ),( Ban Seok Lee ),( Jin Lee ),( Dong Hee Koh ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Abdominal pain that occurs after a colonoscopy may cause significant discomfort in some patients, and residual bowel gas is thought to be a key contributor to this abdominal pain. The purpose of this study was to determine whether total colonic decompression after colonoscopy decreased post-colonoscopy abdominal pain. Methods: Asymptomatic 300 patients who underwent colonoscopy under sedation were randomized to either the decompression group or the control group. Initial colonoscopic procedure was performed uniformly in both groups. After the colonoscopy examination was completed, the colonoscope was reinserted into the cecum, and the intraluminal air was aspirated during withdrawal in the decompression group. Abdominal pain was assessed before discharge and 24-48 hours after colonoscopy using a 10-point visual analogue scale (VAS). Results: The two groups were similar with regard to clinical, demographic and procedural factors. Among 288 patients, the incidence of abdominal pain (VAS =1) after colonoscopy was 38 (26.6%) of 143 patients in the decompression group and 95 (65.5%) of 145 patients in the control group (VAS 0.68 ± 1.35 vs. 2.14 ± 2.15, P <0.001). There was an 86.1% reduction rate of abdominal pain by colonic decompression, based on multivariate analysis (Odds ratio 0.139 [0.077-0.250], P <0.001). Furthermore, independent factors for abdominal pain included female gender and total duration of procedure longer than 800 seconds. There were no reinsertion-related complications in the decompression group. Conclusions: Total colonic decompression after colonoscopy has a beneficial effect and can reduce post-colonoscopy abdominal pain without additional complications.
( Se Min Jeon ),( Abdolreza Hosseindoust ),( Sang Hun Ha ),( Tae Gyun Kim ),( Jun Young Mun ),( Joseph Moturi ),( Suhyup Lee ),( Yo Han Choi ),( Sang Deok Lee ),( Soo Jin Sa ),( Jin Soo Kim ) 한국축산학회(구 한국동물자원과학회) 2021 한국축산학회지 Vol.63 No.4
Several studies have focused on Ca and P requirements for pigs. These requirements are estimated from their retention and bone formation. However, modern pig breeds have different responses to dietary Ca and P than traditional breeds, and their requirements are expected to change on an annual basis. Besides individual Ca and P needs, the Ca to P ratio (Ca/ P) is an important factor in determining requirements. This study aimed to implement a linear and quadratic regression analysis to estimate Ca and P requirements based on average daily gain (ADG), apparent total tract digestibility (ATTD) of Ca (ATTD-Ca), ATTD of P (ATTD-P), and crude protein (CP) digestibility. Results show that Ca/P had linear and quadratic effects on ADG in the phytase-supplemented (PS) group in both the 6-11 kg and 11-25 kg categories. In the latter category, the CP digestibility was linearly increased in response to increasing Ca/P in the without-phytase (WP) group. In the 25-50 kg category, there was a linear response of ADG and linear and quadratic responses of CP digestibility to Ca/P in the PS group, while a linear and quadratic increase in CP digestibility and a quadratic effect on ATTD-Ca were observed in the WP group. In the 50-75 kg category, Ca/P had significant quadratic effects on ADG in the PS and WP groups, along with significant linear and quadratic effects on ATTD-Ca. In addition, Ca/P had significant quadratic effects on ATTD-P and led to a significant linear and quadratic increase in the CP digestibility in the WP group. In the 75-100 kg category, analysis showed a significant decrease in ATTD-Ca and ATTD-P in the PS and WP groups; in the latter, ATTD-P and ATTD-Ca were linearly decreased by increasing Ca/P. In conclusion, our equations predicted a higher Ca/P in the 6-25 kg bodyweight categories and a lower Ca/P in the 50-100 kg category than that recommended in the literature.