고랭지 농업 용수확보를 위한 소규모 빗물 이용시설 적용방안

전계원(Kye Won Jun)(全桂元),장창덕(Chang Deok Jang)(張昌德),정승권(Seung Kwon Jung)(鄭承權),전병희(Byong Hee Jun)(田炳熙) 위기관리 이론과 실천 2013 Crisisonomy Vol.9 No.8

최근 기후변화로 지난 2009년과 2012년에 강원도 태백시에서는 가뭄으로 인하여 엄청난 피해를 경험한 적이 있다. 또한 가뭄과 장마의 예측은 점점 더 어려워져 가는 실정이다. 특히 태백시의 87일간의 가뭄과 제한급수에 따른 피해액은 일상생활 134억원, 산업부문 338억원, 공공부문 47억원, 정신적ㆍ사회적 피해 1, 430억원 등 총 1, 949억원에 달하는 것으로 분석되었다. 태백시에 또 다른 큰 문제점은 가뭄으로 인한 고랭지 농업 피해로 인한 손실이다. 고랭지 배추를 생산하는 태백시는 우리나라 유일의 고산지역의 도시로서, 고랭지 농업이 특히 발달한 지역이다. 특히 태백 고랭지 배추는 태백시 농산품의 95.9%, 총 경지면적의 86.6%를 차지하고 있으므로, 배추의 생산성이 태백시 농산품 생산성을 대변한다고 할 수 있다. 본 연구에서는 태백시의 공공기관과 고랭지 농업 지역을 직접 방문하여 소규모 빗물 이용 시설에 대한 현황조사 및 시설의 상태를 점검하고 가뭄발생시 고랭지 농업지역의 피해를 최소화 할 수 있도록 소규모 빗물 이용 시설의 적용 방안 및 효과를 분석하였다. Recently, drought and rainy season are getting more serious. It is getting hard to forecast about drought because drought frequency is getting shorter than before. In 2009(winter) and 2012(summer), Taebaek-si was suffered from enormous damage due to the drought. Particularly, in 2009, cost of damage due to drought and restriction on water supply for 87days were estimated daily life sector 134 billion won, industry sector 338 billion won, the public sector 47 billion won, mental and social damage 1, 430 billion won. The other big issue of Taebaek is decrease in products of Highland Agricultural caused by the drought. Highland chinese cabbage which is the most important agricultural product in Taebaek-si account for 95.9% of all agricultural production of Taebaek-si and account for 86.6% of all gross area. For this reason, chinese cabbage of Taebaek-si is tropical agricultural product and is in charge of supply cabbage definitely. It is considered that if small scale rainwater harvesting system would be installed in highland agriculture area, it could reduce damage of drought at low cost and damage of cabbage would be decrease by system. For this study, We have researched regarding current status of Small Scale Rainwater Harvesting System of Highland Agriculture area in Taebaek-si and have compared with the amount of damage and installation cost in case of drought for the beneficial effects of Small Scale Rainwater Harvesting System, flexible supply of water and damage minimization of agricultural products.

동북아 피더네트워크의 Win-win전략에 관한 연구

장우준(Woo-jun jang),전찬용(Chan-Yong jeon),김태원(Tae-Won Kim),곽규석(Kyu-Seok Kwak),남기찬(Ki-Chan Nam) 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.3 No.1

최근 중국은 양산항을 개장하여 선사 유치를 위한 다양한 혜택을 제공하고, 일본은 "수퍼중추항만 육성계획“을 세워 항만의 효율성을 바탕으로 비용을 낮추려는 노력을 하고 있다. 또한 선박의 대형화에 의한 중심항만(Hub Port) 위주의 기항과 북중국의 대량 물량 발생지역에 대한 직기항 경향으로 동북아 항만간의 경쟁이 더욱더 치열해 지고 있으며 동북아 역내 피더네트워크 강화의 필요성이 제기되고 있다. 따라서, 본 연구에서는 유럽 피더네트워크 전략 사례를 바탕으로 동북아 피더시장 현황을 파악하고 동북아 피더네트워크 구조를 분석함으로써 동북아 역내 항만 및 선사간의 과당경쟁을 지양하고 서로 Win-Win할 수 있는 터미널의 전략적 활용, 선사간 제휴 확대, 항만간 협력 강화를 위한 구체적인 전략을 제시하였다. Recently, China opened Yangshan port and provides a variety of benefits for shipping companies. Japan plans to reduce logistics costs and improve efficiency through the established "super major ports" project. According to the "hub and spokes" system, the number of direct calls toward North-Chinese ports are increasing. This changing environment has negative effects on the amount of transshipment cargos in Korean ports. In order to make a hub port of a domestic port, it is necessary to develop northeast Asian feeder networks. Therefore, this paper analyzes the structure of northeast Asian feeder networks through the case study of European feeder networks strategy. Finally, we suggests the plans to reinforce feeder networks, which are strategic terminal operation, strategic alliances between shipping companies and port co-operation, for win-win strategy in the competitive northeast Asian market.

Alkali resistant Ni-loaded yolk-shell catalysts for direct internal reforming in molten carbonate fuel cells

Jang, Won-Jun,Hong, Young Jun,Kim, Hak-Min,Shim, Jae-Oh,Roh, Hyun-Seog,Kang, Yun Chan Elsevier 2017 Journal of Power Sources Vol.352 No.-

<P><B>Abstract</B></P> <P>A facile and scalable spray pyrolysis process is applied to synthesize multi-shelled Ni-loaded yolk-shell catalysts on various supports (Al<SUB>2</SUB>O<SUB>3</SUB>, CeO<SUB>2</SUB>, ZrO<SUB>2</SUB>, and La(OH)<SUB>3</SUB>). The prepared catalysts are applied to direct internal reforming (DIR) in a molten carbonate fuel cell (MCFC). Even on exposure to alkali hydroxide vapors, the Ni-loaded yolk-shell catalysts remain highly active for DIR-MCFCs. The Ni@Al<SUB>2</SUB>O<SUB>3</SUB> microspheres show the highest conversion (92%) of CH<SUB>4</SUB> and the best stability among the prepared Ni-loaded yolk-shell catalysts. Although the initial CH<SUB>4</SUB> conversion of the Ni@ZrO<SUB>2</SUB> microspheres is higher than that of the Ni@CeO<SUB>2</SUB> microspheres, the Ni@CeO<SUB>2</SUB> microspheres are more stable. The catalytic performance is strongly dependent on the surface area and acidity and also partly dependent on the reducibility. The acidic nature of Al<SUB>2</SUB>O<SUB>3</SUB> combined with its high surface area and yolk-shell structure enhances the adsorption of CH<SUB>4</SUB> and resistance against alkali poisoning, resulting in efficient DIR-MCFC reactions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni yolk-shell catalysts are synthesized by a simple spray pyrolysis process. </LI> <LI> Ni yolk-shell catalysts on various supports are applied to DIR-MCFC. </LI> <LI> Ni@Al<SUB>2</SUB>O<SUB>3</SUB> shows the highest CH<SUB>4</SUB> conversion even on exposure to alkali hydroxide. </LI> <LI> Catalytic performance is strongly dependent on acidity and partly on reducibility. </LI> <LI> Acidic nature with yolk-shell structure enhances resistance to alkali poisoning. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Dramatic enhancement of the saturation magnetization of a sol-gel synthesized Y₃Fe₅O₁₂ by a mechanical pressing process

Jang, Min-Sun,Roh, Im-Jun,Park, Jungmin,Kang, Chong-Yun,Choi, Won Jun,Baek, Seung-Hyub,Park, Sung Soo,Yoo, Jung-Woo,Lee, Ki-Suk Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.711 No.-

<P><B>Abstract</B></P> <P>We fabricated polycrystalline yttrium-iron-garnet (Y<SUB>3</SUB>Fe<SUB>5</SUB>O<SUB>12</SUB>, YIG) samples using the sol-gel synthesis method to develop an energy harvesting material based on the spin Seebeck effect. We confirmed that crystallization occurred during calcination at 850 °C and that only the polycrystalline YIG structure was formed. We found that a sintering process at 1400 °C not only increased the size of the YIG particles and the densification of their microstructure but also enhanced their saturation magnetization (M<SUB>s</SUB>) and dramatically reduced their coercivity (H<SUB>c</SUB>). A mechanical pressing process was carried out between the calcination and sintering treatments to prepare a free-standing YIG fillet sample. We found that M<SUB>s</SUB> was enhanced by almost three times without an associated reduction in H<SUB>c</SUB>. We found that mechanical pressing assists the oxidation reaction during the subsequent sintering process by increasing the surface energy and densification before the heat treatment.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Yttrium-iron-garnet (YIG) was prepared using sol-gel process without an expensive GGG substrate. </LI> <LI> Optimal calcination and sintering temperatures were determined. </LI> <LI> Substrate-free YIG was fabricated by mechanical pressing. </LI> <LI> Sintering and pressing treatments improved significantly the saturation magnetization (M<SUB>s</SUB>) of YIG. </LI> <LI> The role of mechanical pressing in the enhancement of M<SUB>s</SUB> is addressed clearly. </LI> </UL> </P>

Multilayered graphene grafted copper wires

Jang, Lee-Woon,Zhang, Luman,Menghini, Mariela,Cho, Hyunjin,Hwang, Jun Yeon,Son, Dong Ick,Locquet, Jean-Pierre,Seo, Jin Won Elsevier 2018 Carbon Vol.139 No.-

<P><B>Abstract</B></P> <P>Multilayered graphene is grown on copper (Cu) wires by chemical vapor deposition. Mechanical, chemical, thermal and electrical performances are investigated as a function of growth conditions. The graphene layer which makes a volume of approximately 0.02% of the Cu wire enables a 28–37% improvement on tensile strength and strain-to-failure. The chemical resistance of graphene grafted Cu wires increases by 1.5–3 times in nitric acid, aqua regia, and 1M ammonium persulfate etchants. The electrical resistivity of graphene grafted Cu wires remains almost constant with increasing temperature up to 175 °C, while the resistivity degradation of Cu wires without graphene starts to increase from 70 °C. We demonstrate that graphene can protect the Cu wire from thermal oxidation and chemical etchants and can effectively enhance the mechanical and electrical properties of the Cu wire.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Original Article : Clinical Features, Image Findings, and Prognosis of Inflammatory Pseudotumor of the Liver: A Multicenter Experience of 45 Cases

( Jun Young Park ),( Moon Seok Choi ),( Young Suk Lim ),( Jang Won Park ),( Seung Up Kim ),( Yang Won Min ),( Geum Youn Gwak ),( Yong Han Paik ),( Joon Hyoek Lee ),( Kwang Cheol Koh ),( Seung Woon Pai The Editorial Office of Gut and Liver 2014 Gut and Liver Vol.8 No.1

Background/Aims: Inflammatory pseudotumor (IPT) of the liver is a rare disease characterized by chronic infiltration of inflammatory cells. However, the clinical characteristics and outcomes of IPT remain uncertain. Methods: Clinical features, image findings, and outcomes of 55 patients with histologically proven IPT were evaluated. Results: They consisted of 26 men and 19 women with median age of 65 years. Serum carcinoembryonal antigen and carbohydrate antigen 19-9 levels were normal in 42 patients (93.3%). Enhanced CT scans indicated poorly defined peripheral enhancement (82.5%) at the arterial phase and poorly defined hyperattenuating lesions with internal hypoattenuating areas at the equilibrium phase (77.0%). Gadolinium-enhancement MRI revealed poorly defined peripheral rim-like enhancement (77.8%). Ten patients underwent surgical resection and 35 were treated conservatively with or without antibiotics. No recurrence was noted after surgical resection during follow-up (1 to 48 months). In all patients who received conservative treatment, complete resolution or size reduction was noted during follow-up (1 to 192 months). Conclusions: CT and MRI provide clues to the diagnosis of IPT in patients with liver masses and normal tumor markers. However, due to the lack of pathognomonic findings, the clinician`s suspicion and histological diagnosis are necessary to make an accurate diagnosis of IPT. (Gut Liver 2014,8:58-63)

PCR Chip-adopted Electrochemical Biosensor Module for Diagnosis of Infectious Diseases

Won Jae KIM,Jun Yeong JANG,Min Kyung KIM,Jae Hee WON,Chae Min KIM,Minsub CHUNG 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10

Diagnostic technology has been rapidly innovated in speed, accuracy, and economy with the goal of suppressing and preventing the SARS-CoV-2 virus. The currently used diagnostic method is based on optical analysis, which is bulky and expensive. Label-free electrochemical diagnostic biosensor is a promising alternative since measuring electrical signals is significantly cheaper and simpler than the optical apparatus. By combining electrochemistry and PCR mechanisms, high economic efficiency and accuracy can be achieved at the same time. When an electrochemical probe is inserted in the PCR reaction tube and electrochemical measurement is performed, the precipitation by-products generated during the DNA amplification process are adsorbed on the surface of the metal sensor. The chemical change is easy to measure electrochemically. In this study, a module that enables impedance analysis during the PCR process is designed and fabricated. In order to simultaneously perform electrochemical analysis and PCR, sealing is essential when the sensor probe is inserted. Various types of module design was examined. The effect of the material for the sensor probe and PCR amplification chamber was analysed, and PCR amplification through electrochemistry was confirmed by gel-electrophoresis. The developed biosensor system will enable label-free, rapid, and affordable detection system for various infectious diseases.

Well-to-Wheel Analysis (WTW) on Greenhouse Gas Emissions of Transportation Fuels in South Korea

Won Jae Choi,Eunji Yoo,Jae Jun Jang,Eunsu Seol,Myoungsoo Kim,Han Ho Song(송한호) 한국자동차공학회 2018 한국자동차공학회 Workshop Vol.2018 No.8

Molecular design of sensitizer to suppress efficiency loss mechanism in hyper-fluorescent organic light-emitting diodes

Jang, Ji Seon,Han, Si Hyun,Choi, Hye Won,Yook, Kyoung Soo,Lee, Jun Yeob Elsevier 2018 ORGANIC ELECTRONICS Vol.59 No.-

<P><B>Abstract</B></P> <P>Efficiency loss mechanism of hyper-fluorescent organic light-emitting diodes was studied by comparing two sensitizers with different molecular structures and a design strategy of the sensitizer was suggested. Examination of two sensitizers with a 3,6-dimethylcarbazole or 3,6-di (<I>tert</I>-butyl)carbazole donor proposed that the 3,6-dimethylcarbazole donor could not suppress efficiency loss by fluorescent emitter doping, but the 3,6-di(<I>tert</I>-butyl)carbazole donor effectively suppressed the efficiency loss. There was little decrease of the efficiency of the hyper-fluorescent device built on the 3,6-di(<I>tert</I>-butyl)carbazole based TADF sensitizer according to fluorescent emitter doping concentration. It was proven from this work that the <I>tert</I>-butyl carbazole modified TADF molecules are effective as the sensitizers of the hyper-fluorescent devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Molecular design principle of sensitizer for high quantum efficiency in hyperfluorescence device. </LI> <LI> Suppressed Dexter energy transfer by <I>t</I>-butyl modified sensitizer. </LI> <LI> Constant external quantum efficiency irrespective of fluorescent dopant doping concentration. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Effect of annealing on mechanical properties and microstructure evolution of borated stainless steels

Won, Chi-Hyoung,Jang, Jae Hoon,Kim, Sung-Dae,Moon, Joonoh,Ha, Heon-Young,Kang, Jun-Yun,Lee, Chang-Hoon,Lee, Tae-Ho,Kang, Namhyun Elsevier 2019 JOURNAL OF NUCLEAR MATERIALS Vol.515 No.-

<P><B>Abstract</B></P> <P>A borated stainless steel based on the composition of type 304 stainless steel containing different amount of boron was fabricated through a conventional ingot metallurgy-hot working process, and the relationship between the microstructure and mechanical properties was investigated. As the content of boron increases, the volume fraction of (Fe,Cr)<SUB>2</SUB>B increases, as predicted by thermodynamic equilibrium calculations. As the annealing proceeds at 1180°C, the plate-like shape of (Fe,Cr)<SUB>2</SUB>B turned into a spherical shape. In addition, brittle fracture of the boride was dominant before the heat-treatment, but ductile mode due to the formation of dimples in the austenite was dominant after heat-treatment. In the specimen containing 1.78 wt% of boron, the Cr and Ni contents of the austenite matrix were homogenized after annealing at 1180 °C for 192 h, and the strength and ductility were simultaneously improved.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>