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Effect of Highly Pressurized Hydrogen Gas Charging on the Hydrogen Embrittlement of API X70 Steel
Dong-Su Bae,Chi-Eun Sung1,Hyun-Ju Bang,Sang-Pill Lee,Jin-Kyung Lee,In-Soo Son,조영래,Un-Bong Baek,Seung-HoonNahm 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4
During the use of API X70 steel as a pipeline structural material for the transportation of natural gas,hydrogen embrittlement can occur due to the hydrogen contained in natural gas. The aim of this study is toinvestigate the effects of the hydrogen content under high-pressure hydrogen gas conditions on the hydrogenembrittlement of air-cooled API X70 steel. The air-cooled API X70 steel was manufactured by hot rollingand was then air-cooled to room temperature. Tensile test specimens were held for 0 h, 1000 h, and 2000 hwithin a pressure vessel filled with 100% hydrogen gas at a gas pressure of 10 MPa, with the tensile teststhen performed at room temperature. The microstructure of the API X70 steel consists of coarse polygonalferrite, coarse pearlite, and fine acicular ferrite. The yield and tensile strength increased and elongationdecreased considerably after a holding time of 2000 h compared to those of 0 h and 1000 h within the pressurevessel. The morphology of the fracture surface changed from ductile to brittle upon hydrogen gas charging. Secondary cracks were observed in both of the hydrogen-gas-charged specimens. No external cracks wereformed on the surface of the tensile-tested specimen with a 0 h holding time; however, many external crackswere observed on the specimen surface subjected to hydrogen gas charging.
Lee, Seung-Hwan,Kim, Hong-Ki,Yun, Ye-Sol,Jeong, Tae-Hoon,Nam, Sung-Pill,Kim, Young-Sung,Kim, Jae-Chul,Lee, Ku-Tak,Im, In-Ho The Korean Institute of Electrical and Electronic 2014 Transactions on Electrical and Electronic Material Vol.15 No.2
We fabricated $(Li_{0.5-x}Na_xLa_{0.5})Ti_{0.8}Zr_{0.2}O_3$(LNTLZ)ceramics ($0{\leq}x{\leq}0.4$) with a perovskite structure via standard solid state synthesis. The influence of Na content on the structural and electrical properties of LNTLZ ceramics was also investigated. During XRD patterns analysis, all of the samples showed orthorhombic structure. The resistance of LNTLZ ceramics decreased as Na content increased, and the maximum activation energy shows 0.56 eV at x=0.4 at room temperature. These results indicated that LNTLZ ceramics are a candidate for use Lithium ion batteries as electrolytes.
Lee, Eung-Pill,Lee, Soo-In,Jeong, Heon-Mo,Han, Young-Sub,Lee, Seung-Yeon,Park, Jae-Hoon,Jang, Rae-Ha,Hong, Youg-Sik,Jung, Young-Ho,Kim, Eui-Joo,Lee, Sang-Hun,You, Young-Han The Ecological Society of Korea 2019 Journal of Ecology and Environment Vol.43 No.4
Background: Standing biomass, litter production, rate of litter decomposition, amount of litter on forest floor, and amount of soil organic carbon distribution were investigated from March 2016 to November 2018 in order to evaluate the ecosystem value through organic carbon distribution in the Pinus densiflora forest at Namsan, Seoul Metropolitan City. Results: The amount of organic carbon in the Pinus densiflora forest was 261.09 ton C ha<sup>-1</sup> during the research period, and fixed organic carbon in plant through net photosynthesis was 3.2 ton C ha<sup>-1</sup> year<sup>-1</sup>. The organic carbon in plant was 62.77 ton C ha<sup>-1</sup> (24.04%), in litter on the forest floor was 3.65 ton C ha<sup>-1</sup> (1.40%), and in soil was 194.67 ton C ha<sup>-1</sup> (74.56%). The value of plant, litter on forest floor, and soil organic carbon distribution were each 6,277,000 won ha<sup>-1</sup>, 365, 000 won ha<sup>-1</sup>, and 19,467,000 won ha<sup>-1</sup>. The value per ton of fixed organic carbon in plant through net photosynthesis was 320,000 won ha<sup>-1</sup> year<sup>-1</sup> and the value of ecosystem services stored in carbon in the Namsan forest ecosystem was about 26.1 million won ha<sup>-1</sup> for 3 years. Conclusions: The results of this study suggest that the pine forests of Namsan rapidly decompose leaves due to the high atmospheric temperature and accumulate a large amount of organic carbon in the soil to provide climate control regulatory service function.
Pilot Case for Container Security Device (CSD) Based on Active RFID
Lee, Eun-Kyu,Moon, Young-Sik,Shin, Joong-Jo,Shon, Jung-Rock,Choi, Sung-Pill,Kim, Chae-Soo,Kim, Jae-Joong,Choi, Hyung-Rim The Korea Institute of Information and Commucation 2010 Journal of information and communication convergen Vol.8 No.2
CSD is Active RFID based Container Security Device which is proposed by the U.S Department of Home Security. It is mounted inside the container to sense opening of the container door. ConTracer is the CSD which is developed in this research whose major features are sensing door opening status as well as history inquiring on internal environment and shock to the container by mounting the temperature/ humidity/ shock sensors. Moreover, its RFID frequency bandwidth uses 433MHz and 2.4GHz to correspond actively to the frequency used by different countries. This paper introduces the development trend of CSD, compares the ConTracer which is developed thru this research and other company's CSD, and introduces CSD System which is designed and established using ConTracer. Finally, the implemented CSD System is verified by applying the demonstration service to container distribution between Korea and China.
Lee, Sang-Pill,Yoon, Han-Ki,Park, Won-Jo Korean Society of Ocean Engineers 2000 International journal of ocean engineering and tec Vol.3 No.1
The present study dealt with the relationships among the interfacial shear strength, the thickness of interfacial reaction layer and the impact value of $Nb/MoSi_2$ laminate composites. In addition, the tensile test was conducted to evaluate the fracture strain of $Nb/MoSi_2$ laminate composites. To change the thickness of the reaction layer, $Nb/MoSi_2$ laminate composites alternating sintered MoSi2 layers and Nb foils were fabricated as the parameter of hot press temperature. It has been found that the growth of the reaction layer increases the interfacial shear strength and decreases the impact value by localizing a plastic deformation of Nb foil. There also exist appropriate shear strength and the thickness of the reaction layer, which are capable of maximizing the fracture energy of $Nb/MoSi_2$.
Coat Color Patterns and Genotypes of Extension and Agouti in Hanwoo and Jeju Black Cattle
Sang-Hyun Han(한상현),In-Cheol Cho(조인철),Jae-Hwan Kim(김재환),Moon-Suck Ko(고문석),Young-Hoon Kim(김영훈),Eun-Young Kim(김은영),Se-Pill Park(박세필),Sung-Soo Lee(이성수) 한국생명과학회 2011 생명과학회지 Vol.21 No.4
소의 Extension(E), Agouti(A) 유전자형과 모색유전양상의 연관관계를 이해하기 위해, 한우와 제주흑우(JBC), 이들 사이에서 생산된 교배후손에서 melanocortin-1 receptor( MC1R)과 agouti signaling protein( ASIP)의 유전자형을 분석하였다. 흑모색의 JBC에서는 세 가지 MC1R대립인자들(E<SUP>D</SUP>, E?, e)이 모두 발견되었다. JBC 집단은 한우에서 우점적으로 나타나는 열성동형접합자(e/e)가 발견되지 않았다. 반면, MC1R E?/e한우는 흑모색이 아닌 갈색이나 적색의 모색을 나타내었다. ASIP유전자에서, 한우에서는 L1-BT 전위인자의 삽입/결실에 의해 세 가지 유전자형(A/A, A/A<SUP>Br</SUP>, A<SUP>Br</SUP>/A<SUP>Br</SUP>)이 모두 관찰되었다. JBC 집단에서는 ASIP A<SUP>Br</SUP> 대립인자가 드물게 관찰되고, ASIP A<SUP>Br</SUP>/A<SUP>Br</SUP> 동형접합인 개체들은 발견되지 않았다. ASIP A<SUP>Br</SUP> 대립인자를 보유하더라도 한우와 JBC, 이들의 교배후손에서도 agouti-유사 얼룩무늬 모색은 발견되지 않았다. 교배후손의 모색은 Agouti 유전자형과는 무관하고, Extension유전자형과 직접적으로 연관되어 황-갈색(e/e)과 암-갈/흑색(E?/e)으로만 구분되었다. ASIP유전자형은 아마도 한우 또는 교배 후손에서 모색의 발달에 영향이 없는 것으로 추정된다. 본 연구 결과는 한우, 제주흑우, 이들의 교배후손에서 MC1R유전자형이 모색 표현형을 결정하며, ASIP유전자형은 모색의 변이에는 핵심적인 역할을 수행하지 않는다는 것을 시사한다. To understand the relationship between coat color inheritance patterns and genotypes of Extension( E) and Agouti( A) loci in cattle, the genotypes for melanocortin-1 receptor( MC1R) and agouti signaling protein ( ASIP) were analyzed in Hanwoo, Jeju black cattle (JBC), and their crossbred progeny. Three MC1R alleles ( E<SUP>D</SUP>, E?, and e) were found in the black-colored JBC population. JBC had no recessive homoygotes (e/e), but this genotype was predominant in the Hanwoo breed. However, MC1R E?/eHanwoo did not produce a black coat color as they appeared either as brown or solid red. For ASIP, three genotypes ( A/A, A/A<SUP>Br</SUP>, and A<SUP>Br</SUP>/A<SUP>Br</SUP>) were determined by insertion/deletion of an L1-BT element in Hanwoo. The ASIP A<SUP>Br</SUP> allele was rarely observed, and no ASIP A<SUP>Br</SUP>/A<SUP>Br</SUP> homozygotes were detected in the JBC population. Cattle carrying ASIP ABr did not show any agouti-like brindle pigmentation patterns in either breed or their progeny. The coat colors of the crossbred progeny were discriminated by two colors, yellowish-brown versus dark-brown or black, and their coat colors were directly related to the genotypes of the Extensionlocus, yellowish-brown (e/e) and dark-brown or black (E?/e), but not to the Agouti locus. ASIP genotypes probably did not affect coat color development in the Hanwoo or crossbred progeny. Our results suggest that the ASIP genotypes do not play key roles in coat color variation, but the MC1R genotypes do direct the phenotypes of Hanwoo, JBC, and their progeny.