• Progress in Superconductivity
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• 제4권2호
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• pp.148-152
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• 2003

We have observed the temperature dependences of Bi $L_{III}$ edge spectra by extended X-ray absorption spectroscopy for a high quality single crystal and a powder of the $Ba_{0.6}K_{0.4}BiO_3$ superconductor. $Ba_{0.6}K_{0.4}BiO_3$ has the cubic structure and metallic states. The deformation of the $BiO_{6}$ octahedra, which is due to the anomalies of the Bi-O and Bi-Ba bond length, was showed by the double-shell fit. It was clearly found that these anomalies are owing to the difference in the strength of Bi-O bonds. The temperature dependences of both bond lengths and the Debye-Walter factor ${\sigma}^2$ of the Bi-O and Bi-(Ba,K) bond are discussed to illustrate local structural features of the $Ba_{0.6}K_{0.4}BiO_3$

• 한국세라믹학회지
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• 제35권10호
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• pp.1107-1112
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• 1998

We could obtan c-axis oriented $SrBi_2$$Ta_2$$O_9$ thin films on usual Pt(111)/Ti/$SiO_2$/Si(100) substrate using a r. f. magnetron sputtering technique. According to the increase of sputtering pressure from 250 to 300 mTorr the Bi content and degree of the c-a xis preferred orientation of $SrBi_2$$Ta_2$$O_9$ thin films were increased. By controlling Bi(or $Bi_2O_3$) loss from $SrBi_2$$Ta_2$$O_9$ thin films during post annealing and by inserting $Bi_2O_3$ layer in $SrBi_2$$Ta_2$$O_9$ thin films the effect of Bi content on the c-axis oriented growth of $SrBi_2$$Ta_2$$O_9$ thin films could be investigated without the effect of sputtering pressure. The degree of the c-axis preferred orientation of $SrBi_2$$Ta_2$$O_9$ thin films was increased with increasing with increasing Bi content by control of Bi(or $Bi_2O_3$) loss of $SrBi_2$$Ta_2$$O_9$ thin films. But the c-axis oriented growth of $SrBi_2$$Ta_2$$O_9$ thin films disappeared by the inserting of $Bi_2O_3$ lay-er in $SrBi_2$$Ta_2$$O_9$ thin films.

• Journal of Information Technology Applications and Management
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• 제24권1호
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• pp.45-61
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• 2017

Business intelligence has been attracting much attention these days. Despite such popularity of BI systems, it is widely known that about a half of BI system projects have failed. To grasp why many BI projects end in failure and what factors would make BI projects less failure-prone, a number of BI studies were made to produce a variety of CSFs. However, there is a paucity of information on whether these CSFs are distinctive from those of typical information systems. By identifying how BI CSFs differ from CSFs of typical information systems, we would be able to explain why most BI projects are more likely to be failure. It is believed that a corrective measure about CSFs will lead to more success in future BI projects. In addition, though there have been a number of similar types of BI systems such as decision support systems and executive information systems in existence, there was no study to determine whether there is ever a discrimination between CSFs of BI systems and the similarly-titled systems. This study is to answer these questions using a literature review analysis. The findings of our study are expected to be helpful in a successful implementation of BI systems.

• Journal of Electrochemical Science and Technology
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• 제14권1호
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• pp.21-30
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• 2023

This work presents a correlation between the behavior of formic acid oxidation (FAO) on various Bi-modified Pt(poly) disk electrodes and their morphologies observed on Bi-modified Pt(111) disk electrodes using electrochemical scanning tunneling microscopy (EC-STM) to understand the effects of Bi on Pt. To distinguish the FAO activities of Bi on Pt and plain Pt around Bi, additional Pt was intentionally deposited using two different routes: direct route and iodine route. In direct route, Pt was directly deposited on Bi islands and plain Pt sites around Bi islands, while in iodine route, Pt was exclusively deposited on Bi islands by protecting plain Pt sites with adsorbed iodine. Thus, a comparison of FAO performances on the two Bi-modified Pt electrodes with additional Pt (deposited in the different ways) disclosed a difference in FAO performances on plain Pt sites and Bi islands. When Bi coverage was ~0.04, the Bi deposits were scattered Bi islands enhancing FAO on Pt(poly). The additional Pt deposits using direct route increased FAO efficiency, while the ones using iodine route slightly decreased FAO current. The EC-STM observations indicated that Pt deposits around Bi islands, not on Bi islands, were responsible for the FAO current increase on Bi-modified Pt(poly). The FAO efficiency on Bi-modified Pt(poly) with a Bi coverage of ~0.25 increased by a factor of 2. However, the additional Pt deposits using the two Pt deposition routes notably decreased the FAO current. The dependency of FAO on Bi coverage was discussed in terms of electronic effect and ensemble effect.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2005년도 추계학술발표대회 개요집
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• pp.262-264
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• 2005

$Bi_{2}Sr_{2}CaCu_{2}O_{x}$(Bi-2212) and $Bi_{2}Sr_{2}Ca_{2}Cu_{3}O_{y}$(Bi-2223) high-$T_{c}$ superconductor(HTS) coating have been prepared by plasma spraying and heaat treatment. The Bi-2212 HTS coating later is synthesized through the peritectic reaction between Sr-Ca-Cu oxide coating layer and Bi-Cu oxide coating later, and $Bi_{2}Sr_{2}CaCu_{2}O_{y}$(Bi-2212) superconducting phase grow by partial melting process. The superconducting characteristic depends strongly on the conditions of the partial melting process. the Bi-2212 HTS layer consists of the whiskers grown in the diffusion direction. Above the 2212 layer, Bi-2223 phase and secondary phase was observed. The secondary phase is distributed uniformly over the whole surface. This is caused to the microcrack on the coatings surface. Despite everything, the film shows superconducting with an onset $T_{c}$ of about 115K. There are two changes steps. One changes (1step) at 115K is due to the diamagnetism of the Bi-2223 phase and the other changes (2step) at 78K is due to the diamagnetism of the Bi-2212 phase.

• Bulletin of the Korean Chemical Society
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• 제34권3호
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• pp.773-776
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• 2013

We have prepared 1-D BiSI and 2-D BiOI nanostructures, and characterized them by scanning electron microscopy, transmission electron microscopy (TEM), X-ray diffraction crystallography, thermogravimetric analysis/differential scanning calorimetry, and UV-visible absorption. Here, we first report clear HR-TEM image of BiSI. In addition, we first found that the growth direction of BiSI is [12-1] plane, with the neighboring distance of 0.30 nm. The crystal structures of BiSI and BiOI are found to be orthorhombic (Pnam) and tetragonal (P4/nmm), respectively. The absorption band gaps of BiSI and BiOI are measured to be 1.55 and 1.92 eV, respectively. Our study could further highlight the applications of V-VI-VII compounds.

• 마이크로전자및패키징학회지
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• 제8권4호
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• pp.25-33
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• 2001

Bi(0, 2.5, 4.8, 7.5, 10 wt%)가 첨가된 Sn-3.5Ag-xBi 합금을 주조 및 압연을 거쳐 준비하였다. 그 후, dog-bone형상의 시편의 안정한 미세 조직을 위해 열처리를 거친 후, 일정하중에 크리프 실험을 수행하였다. 2.5%Bi 첨가 합금의 경우, 크리프 저항성이 가장 우수하였으며, Bi가 더 첨가됨에 따라 크리프 저항성은 감소하였다. 합금의 응력 지수는 전형전인 전위 크리프에 의한 4를 나타내었으며, 10%Bi 시편의 경우, 입계 미끄러짐에 의한 2를 나타내었다. 0%Bi 합금의 경우, 연성 파괴 양상을 보인 반면, Bi 첨가 합금의 경우, 약간의 단면적 감소를 보이는 취성 파괴 양상을 보여주었다. 파단 시편의 미세 조직 관찰 결과, 응력축에 수직한 방향으로 기공이 관찰되었으며, 상당량의 입계 미끄러짐이 관찰되었다.

• Journal of Electrochemical Science and Technology
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• 제12권3호
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• pp.323-329
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• 2021

This work presents a contrasting behavior of formic acid oxidation (FAO) on the Pt and Bi deposits on different Pt substrates. Using irreversible adsorption method, Bi and Pt were sequentially deposited on Pt electrodes of nanoparticle (Pt NP) and disk (Pt disk). The deposited layers of Bi and Pt on the Pt substrates were characterized with X-ray photoelectron spectroscopy, transmission microscopy and scanning tunneling microscopy. The electrochemical behaviors and FAO enhancements of Pt NP and Pt disk with deposited Bi only (i.e., Bi/Pt NP and Bi/Pt disk), were similar to each other. However, additional deposition of Pt on Bi/Pt NP and Bi/Pt disk (i.e., Pt/Bi/Pt NP and Pt/Bi/Pt disk) changed the electrochemical behavior and FAO activity in different ways depending on the shapes of the Pt substrates. With Pt/Bi/Pt NP, the hydrogen adsorption was suppressed and the surface oxidation of Pt was enhanced; while with Pt/Bi/Pt disk, the opposite behavior was observed. This difference was interpreted as a stronger interaction between the deposited Bi and Pt on Pt NP than that on Pt disk. The FAO performance on Pt/Bi/Pt NP is much better than that on Pt/Bi/Pt disk, most likely due to the difference in the interaction between the deposited Pt and Bi depending on the shapes of Pt substrates. In designing FAO electrochemical catalysts using Pt and Bi, the shape of a Pt substrate was concluded to be critically considered.

• 대한한의학원전학회지
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• 제6권
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• pp.176-188
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• 1993

After studing on the type of Bi(肥) and Su(痩) of Body in 'Yellow Emperior's Nei-Ching', I reached the following conclusions; 1. The specific charactor of bi(肥) and su(痩) were explained in table 1. 2. The specific charactor of gi(脂), ko(膏) and youk(肉) were explaned in table 2. 3. Obserbing the type of bi(肥) and su(痩) by the view of YinYang(陰陽), bi(肥) belongs to Yin(陰) and su(痩) belongs to Yang(陽). Also the each of bi(肥) and su(痩) could obserbed by the view of YinYang(陰陽). The type of su(痩) easily becomes to yanghea(陽虛) because chi(氣) easely becomes to exhaust also easely becomes to yinhea(陰虛) because blood(血) easely becomes to exhaust. So the outer of body is cold, the inner of body is hot. The type of bi(肥) easely causes YinYang(陰陽) to exceed because blood(血) easely becomes to black and turbid(血黑以濁), chi(氣) easely becomes to rough and slow(氣澁以遲). So the outer of body is hot, the iner of body is cold 4. Obserbing the type of bi(肥) and su(痩) by the view of viscera, in view of upper and lower(上下觀點) su(痩) is yang(陽) so heart and lung belongs to su(痩) bi(肥) is yin(陰) so liver and kidney belongs In bi(肥). in view of inner and outer(內外觀點) su(痩) is inner(內) so heart 3I1d liver belongs In su(痩) bi(肥) is outer(外) so lung and kidney belongs to bi(肥). 5. Obserbing the type of bi(肥) and su(痩) by the view of body constitution(體質), partially body constitution was divided into gi(脂), ko(膏) and youk(肉), entirely there was OhtaeinLon(五態人論) and four constitutional medicine(四象醫學) I thing that taeyangin(太陽人) and soyangin(少陽人) belong to su(痩), taeyinin(太陰人) and soyinin(少陰人) belong to bi(肥).

• 생명과학회지
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• 제16권3호
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• pp.409-414
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• 2006

소포체는 세포막의 합성뿐만 아니라 세포막에 존재하거나 세포외로 분비되어져야 할 단백질을 합성하는 세포내 소기관이다. 소포체에서 단백질이 합성되어질 경우 이황화결합이 형성되고 glycosylation 등의 수식이 일어나며, 이와 동시에 folding과 assembly과정을 거쳐 삼차원적 구조로 성숙이 되는데 이 과정은 folding enzyme과 molecular chaperone의 도움을 받아 이루어진다. 소포체 내에 존재하는 molecular chaperone 중 가장 잘 알려진 것으로 BiP이 있다. BiP의 기능은 N-terminus의 ATPase domain에 의해 조절되고 ATPase domain은 이것과 선택적으로 결합하는 조절인자에 의해 ATPase의 활성이 영향을 받는다. BiP의 핵산치환조절인자로서 발견된 BAP은 ATPase domain에 결합된 ADP를 ATP로 치환하는 것으로 기능이 알려져 있다. 이 BAP의 핵산치환기능이 BiP의 샤페론 작용에 어떤 영향을 미치는지를 in vitro에서 항체 heavy chain을 이용하여 알아보았다. BAP은 ATP보다 ADP가 결합되어 있는 BiP과 더 잘 결합을 하며, in vitro에서 BiP과 결합하고 있는 unfolded 단백질을 BAP은 BiP으로부터 해리하였다. 또한 소포체내에 존재하는 Hsp70 homologue chaperone인 BiP과 Grp170에 대한 BAP의 결합특이성을 anti-Grp170과 anti-BAP 항체로 co-immunoprecipitation을 하여 확인한 결과 BAP은 Grp170과 결합을 하지 않았다. 따라서 BAP은 ER내에 존재하는 동일한 family group에 속하는 Grp170과 BiP에 대하여 BiP에만 특이성을 갖는 것으로 나타났다.