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Chung, Sung Yun,Kim, Sunyoung,Lee, Ju‐,Hyuck,Kim, Kyongjun,Kim, Sang‐,Woo,Kang, Chong‐,Yun,Yoon, Seok‐,Jin,Kim, Youn Sang WILEY‐VCH Verlag 2012 ADVANCED MATERIALS Vol.24 No.45
<P>An all‐solution‐processed flexible piezoelectric nanogenerator, composed of polycrystalline ZnO thin film and functional polymer layers such as P3HT/PCBM and PEDOT:PSS, generates energy through a mechanical rolling and muscle stretching system. On page 6022, Youn Sang Kim, Sang‐Woo Kim, and co‐workers show that this all‐solution‐processed nanogenerator is feasible as a piezoelectric patchable device and is promising for use in future energy harvesters such as wearable human patches and mobile electronics. </P>
Sung, Min Jae,Yoon, Seongwon,Kwon, Soon-Ki,Kim, Yun-Hi,Chung, Dae Sung American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.45
<P>A push pull-type donor copolymer, named PP-TPD, was synthesized with the Suzuki coupling reaction using 6H-phenanthro[1,10,9,8-cdefg]carbazole (PCZ) as the donor unit and 1,3-bis (5-bromo thiophen-2-y1)-5-octyl-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione (TPD) as the acceptor unit. The synthesized PP-TPD was systematically investigated in terms of crystallinity and thermal, electrical, electrochemical, and optical properties. PP-TPD revealed green-selective absorption with a narrow full width at half-maximum of 138 nm. Green-selective organic photodiodes (OPDs) were constructed using PP-TPD as the green-absorbing donor and ZnO as the nonabsorbing acceptor material. The fabricated OPDs exhibited an extremely low dark current of 0.68 nA/cm(2) at -5 V and a high detectivity above 10(12) Jones at 550 nm. Moreover, they showed a sufficiently high 3-dB frequency and a linear dynamic range, similar to those of ideal-operating OPDs. The origin and physics background of the observed low dark current and high detectivity are discussed in detail.</P>
Microstructure and Mechanical Properties in the Friction Stir Welded C70600 Alloy
Sung-Wook Chung,Tai-Jin Yoon,Joong-Suk Noh,Chung-Yun Kang 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.2
A friction stir welded (FSW-ed) C70600 alloy plate was partially welded to other C70600 alloy plate by the gas tungsten arc welding (GTAW). First, FSW was performed on the C70600 alloy by 2-steps (on the top and the bottom). The ultimate tensile strength after FSW was average 317MPa very close to that (average 324MPa) of GTAW-ed C70600 joint. The bending test results after FSW varied by the welding condition. Case A failed the bending test according to the ASME code (ASME Sec. Ⅸ) at the face bending because of relatively lower heat input (rotation speed/traveling speed was 600rpm / 200mm/min) while Case B (higher heat input; rotation speed/traveling speed was 1200rpm / 200mm/min) met the requirements. There were characteristic microstructures such as black-arc-arrays of the oxides in the FSW stir zone (SZ) and the micro-pores in the boundary between FSW-SZ and GTAW weld metal (WM). The former was originated from the crushed and stirred oxides which pre-existed on the base metal surface. The latter could result from re-gasified O2 gas formed by Cu oxides melted at the boundary between FSW-SZ and GTAW-WM.
( Sung Bum Cho ),( Young Lan Park ),( Nuri Kim ),( Cho Yun Chung ),( Hyung Chul Park ),( Jong Sun Kim ),( Dae Seong Myung ),( Kyung Hwa Lee ),( Jae Hyuk Lee ),( Sung Kyu Choi ),( Young Eun Joo ) 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background: Livin, a member of the inhibitors of apoptosis proteins, has been found to be expressed in variable cancers, where its expression is considered to be a poor prognostic marker. The purposes of this study were to observe the effect of Livin on tumor cell behaviors of human hepatocellular carcinoma (HCC) cells and to evaluate its expression in human HCC tissues and its relation to prognosis. Methods: We investigated the biologic role of Livin on tumor cell behaviors by using the small interfering RNA (siRNA) in human HCC cell line, HepG2. The migration, invasion and proliferation assays were performed. To evaluate the impact of Livin on apoptosis and cell cycle, we performed flow cytometric analyses and Western blotting. The expression of Livin by western blotting and immunohistochemistry was investigated in human HCC tissues. Results: Knockdown of Livin suppressed tumor cell migration, invasion and proliferation in human HCC cells. The proportion of apoptotic cells induced by knockdown of Livin was greater than that induced by the scramble siRNA-transfected cells in human HCC cells. Knockdown of Livin activated cleaved caspase-3, -7, -9 and PARP, leading to induction of apoptosis in human HCC cells. Knockdown of Livin induced the G2/M phase arrest by decreasing cyclin D1, CDK4 and CDK6, and by increasing p16, p21, p27 and p57 expression in human HCC cells. The expression of Livin was significantly elevated in human HCC tissues compared to normal hepatic tissues. But Livin expression is not associated with various clinicopa- thological parameters including survival. Conclusions: These results suggest that Livin is associated with the alteration of invasive and oncogenic phenotypes such as tumor cell migration, invasion, proliferation, resistance to apoptosis and cell cycle arrest in human HCC cells.
( Yun Hwa Jung ),( Jae Young Kim ),( Yu Na Jang ),( Sang Hoon Yoo ),( Gyo Hui Kim ),( Kang Min Lee ),( In Kyu Lee ),( Su Mi Chung ),( In Sook Woo ) 대한내과학회 2018 The Korean Journal of Internal Medicine Vol.33 No.6
Background/Aims: Elderly patients (≥ 80 years) with colorectal cancer (CRC) tend to avoid active treatment at the time of diagnosis despite of recent advances in treatment. The aim of this study was to determine treatment propensity of elderly patients aged ≥ 80 years with CRC in clinical practice and the impact of anticancer treatment on overall survival (OS). Methods: Medical charts of 152 elderly patients (aged ≥ 80 years) diagnosed with CRC between 1998 and 2012 were retrospectively reviewed. Patients’ clinical characteristics, treatment modalities received, and clinical outcome were analyzed. Results: Their median age was 82 years (range, 80 to 98). Of 152 patients, 148 were assessable for the extent of the disease. Eighty-two of 98 patients with localized disease and 28 of 50 patients with metastatic disease had received surgery or chemotherapy or both. Surgery was performed in 79 of 98 patients with localized disease and 15 of 50 patients with metastatic disease. Chemotherapy was administered in only 24 of 50 patients with metastatic disease. Patients who received anticancer treatment according to disease extent showed significantly longer OS compared to untreated patients (localized disease, 76.2 months vs. 15.4 months, p = 0.000; metastatic disease, 9.9 months vs. 2.6 months, p = 0.001). Along with anticancer treatment, favorable performance status (PS) was associated with longer OS in multivariate analysis of clinical outcome. Conclusions: Elderly patients aged ≥ 80 years with CRC tended to receive less treatment for metastatic disease. Nevertheless, anticancer treatment in patients with favorable PS was effective in prolonging OS regardless of disease extent.
Yun-Ang Chung, Hyo-Sang Chung, Chan-Su Ryu 조선대학교 기초과학연구원 2011 조선자연과학논문집 Vol.4 No.1
The recent global warming may be estimated to give lots of impacts to the human society and biosphere of influencing climate change included by the natural climate variations through the human activity which can directly and/or indirectly play a major role of total atmospheric composition overall. Therefore it currently appears evidences such as hot wave, typhoon, and biosphere disturbance, etc. over the several regions to be influenced by global warming due to increasing the concentration of greenhouse gases in the atmosphere through inducing forest destruction, fossil fuel combustion, greenhouse gases emission, etc. since industrial revolution era. Through the working group report of IPCC (Intergovernmental Panel on Climate Change) for climate change was analyzed by the individual country's current status and figure out the important issues and problems related to the future trend of climate change science with advanced countries preparedness and research, In this study, the first working group report of IPCC focuses on those aspects of the current understanding of the physical science of climate change that are judged to be most relevant to policymakers. As this report was assessed and analyzed by including the progress of climate change science, the role of climate models and evolution in the treatment of uncertainties. This consists of the changes in atmospheric constituents(both aerosols and gases) that affect the radiative energy balance in the atmosphere and determine the Earth's climate, considering the interaction between biogeochemical cycles that affect atmospheric constituents and climate change, including aerosol/cloud interactions, the extensive range of observations snow available for the atmosphere and surface, for snow, ice, and frozen ground and for the oceans, respectively and changes in sea level, the paleoclimate perspective and assessment of evidence for past climate change and the extension, the ways in which physical processes are simulated in climate models and the evaluation of models against observed climate, the development plans and methods of improving expert and building manpower urgently and R&D fund expansion in detail for climate change science in Korea will be proposed.
Yun, Yeong-Sik,Seong, Hye-Jin,Zhang, Qi-Man,Chung, Sang-Uk,Lee, Ga-Eul,Jang, Se-Young,Lee, Jin-wook,Lee, Sang-Hoon,Moon, Sang-Ho The Korean Society of Grassland and Forage Science 2018 한국초지조사료학회지 Vol.38 No.3
This study was conducted to determine grazing intensity of growing Korean native goats(Capra hircus coreanae) on mountainous pasture. It was carried out to obtain basic information for improvement of mountainous pasture management and establishing feeding system of Korean native goat. A total of 20 goats were grouped by feeding systems [A mountainous pasture grazing group (Concentrated feed of 1.5% body weight, treatment 1, T1, n=10) and a barn feeding group (TMR, treatment 2, T2), n=10] to conduct study from April to September. The average forage productivity of the mountain pasture was $500.9{\pm}61.41kg/ha$. The average dry matter intake in T1 was 0.64 and the calculated grazing intensity was 21 head/ha. In productivity, when the two treatments(T1, T2) were compared, the dry matter intake was about two to three times the difference. The average daily gain per day during the experiment was 63.3 in the mountain pasture and 120 g in barn feeding. When grazing, considering mountainous pasture productivity it is necessary to increase the productivity through proper feeding. The feed costs of black goats raised by grazing on the grassland in the same period showed an average 75% reduction compared to barn feeding. As a result of this study, it can be expected that a considerable reduction of feed costs can be expected in the breeding of Korean native black goat using the mountain pasture.