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Double Torsion 法에 依한 Alumina Ceramics A.D.S. 80의 破壤時의 Acoustic Emission 硏究
姜信珪 嶺南大學校附設 基礎科學硏究所 1986 基礎科學硏究 Vol.6 No.-
Acoustic emission studies on ADS ceramices have been carried out to investigate the cracking in fracture testing. Using double torsion (DT) specimens, AE signals during stable crack growth was monitored. The peak load AE was attributed to crack extension and AE energy was correlated with the energy released during crack propagation. We find out that the good proportionality existed between events rate and crack growth rate. And we obtained small AE events from the distribution of Amplitude (Fig 3-Fig 4), so it can be concluded that the cracking area of these signals were evaluated small (such as 5-10㎛). We also investigated fracture toughtness value of thes specimens (such as 4.4 MP a??, 5.3MPPa??.
공유된 멀티캐스트 트리에서 센터 위치 결정을 위한 새 알고리즘
강신규,심영철 한국통신학회 2000 韓國通信學會論文誌 Vol.25 No.3
Multicast routing algorithms such PIM, CBT, BGMP use shared multicast routing trees and the location of the multicast tree has great impact on the packet delay. In this pater we propose three new center location algorithms and analyze their performance through simulation studies. these three algorithms consider as candidates for the center not only multicast group members but also a few non-members nodes. To select these non-member nodes, we first find all the shortest paths among every couple of members and consider either nodes which are most frequently visited during the process of finding shortest paths or nodes which lie at the center of a shortest path and are most frequently visited during the same process. There the proposed algorithms are able to find the better center than not only algorithms which consider only member nodes but also other algorithms which consider selected non-member nodes in addition ot member nodes. The proposed algorithms either incur too much overhead nor depend upon unicasting algorithms.
강신규 한국물리학회 2016 새물리 Vol.66 No.8
비활성 중성미자의 암흑물질 후보 입자가 될 수 있는 가능성에 대해 논의한다. 비활성 중성미자가 생성될 수 있는 3가지 생성 메카니즘에 대해 알아본다: Dodelson-Widrow (DW) mechanism, Shi-Fuller (SF) mechanism, 스칼라장의 붕괴로부터 비활성 중성미자의 생성. DW 메카니즘은 표준 모형의 중성미자와 비활성 중성미자 사이의 진동에 의해 비활성 중성미자가 생성되는 메카니즘이며, 이렇게 생성된 비활성 중성미자는 X-선 관측 결과와 Lyman-$\alpha$ 관측 결과를 동시에 만족시킬 수 없다. SF 메카니즘은 우주 초기에 충분한 양의 렙톤 비대칭이 구현되었다는 가정하에 MSW 공명에 의한 중성미자 진동을 통하여 비활성 중성미자가 생성되는 메카니즘으로 DW 메카니즘의 문제점을 극복할 수 있게 한다. 한편, 비활성 중성미자는 스칼라장의 붕괴를 통하여 충분한 양이 생성될 수 있다. 비활성 중성미자의 평균 운동량을 계산함으로써 생성 메카니즘에 따라 생성된 비활성 중성미자가 얼만큼 뜨거운지 아니면 차가운지를 알 수 있다. 비활성 중성미자는 X-선 광자를 방출하면서 붕괴될 수 있으며, 이렇게 방출된 X-선을 관측함으로써 비활성 중성미자 암흑물질을 탐색할 수 있는 가능성에 대해 논의한다. We review how the sterile neutrino can be a dark-matter candidate. We study three possible production mechanisms for sterile-neutrino dark-matter: the Dodelson-Widrow (DW) mechanism, the Shi-Fuller (SF) mechanism, and production via the decay of the scalar field. Sterile-neutrino dark matter produced only through the DW mechanism can be eliminated based on a combination of X-ray and Lyman-$\alpha$ measurements. The SF mechanism can ameliorate the problem occurring in the case of DW mechanism. The other alternative is the production of sterile neutrinos via the decay of the scalar field. By estimating the average momentum of the sterile neutrino, we investigate whether sterile neutrinos can be warm dark matter or not. We briefly discuss how sterile neutrinos can be probed indirectly by using X-ray telescopes that can detect the photon line signal produced from radiative decay of the sterile neutrino.
Fe1.6 Ge 金屬間化合物의 Mossbauer 效果硏究
金在慶,金相淵,姜信珪 嶺南大學校附設 基礎科學硏究所 1985 基礎科學硏究 Vol.5 No.-
Intermetallic compound of ?? with B8₂ type structure has been studied in the range 40˚-393˚K using the Mossbauer effect. Spectrum shows the complicated reson ance lines corresponding to the two magnetically inequivalent Fe site. At 40˚K the following hyperfine structure parameter have been obtained H.S(2(a) site)=210KOe. H.S(2(d)site)=140KOe. I.S(2(a) site)=0.208mm/sec. I.S(2(d) site)=0.170mm/sec. It show that the ?? occupied in 2(a) site and ?? in 2(d) site and the magnetic moment of Fe in 2(a) site is larger than the 2(d) site.
동북아시아 건조지역의 황사발생과 사막화에 대한 기후 및 사회·생태학적 고찰
강신규 한국자연보호학회 2012 한국자연보호학회지 Vol.6 No.1
Spatial and temporal variations of Yellow Dust source area and desertification in dryland regions of the Northeast Asia were evaluated based on extensive literature review on field and modeling evidences. In overall, Yellow Dust occurrence decreased since 1960s but it increased again in Mongolia and northeastern China after 2000s, the latter of which indicates eastward encroachment of major Yellow Dust source area for the last decade. The phenomena seem to coincide well with recent desertification of Mongolia, Inner Mongolia, and Manchuria. Vegetation cover is evaluated as an important biophysical variable for controlling both dust occurrence and desertification, which considerably depends on both precipitation and livestock pastoralism. Hence, dryland sustainability should consider dynamic balancing between vegetation productivity and livestock utilization under varying climate and socio-economic situations, which requires socio-ecological perspective on sustainable dryland management.