• 정보보호학회논문지
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• 제13권1호
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• pp.59-67
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• 2003

공개키 인증서와 마찬가지로 속성 인증서 역시 신뢰되기 위해서는 인증서에 대한 유효성 여부를 검증 받아야 한다. 속성 인증서의 유효성 검증은 속성 인증서 체인과 그 체인에 존재하는 각 개체들의 공개키 인증서 체인에 대해 유효성 여부를 검사함으로써 이루어진다. 이렇듯 속성 인증서의 유효성 확인은 공개키 인증서보다 더 복잡하고 많은 처리 과정을 거치게 된다. 이러한 검증 과정은 서비스제공 서버에게는 많은 부담이 될 수 있다. 본 논문에서는 속성인증서 검증을 효과적으로 대신 할 수 있도록 전문화된 검증 서버의 사용을 제안하고 검증 서버와 클라이언트간에 사용될 검증 프로토콜을 정의한다.

• BMB Reports
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• 제42권8호
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• pp.523-528
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• 2009

Phosphomannose isomerase (PMI) catalyzes the interconversion of fructose-6-phosphate and mannose-6-phosphate in the extracellular polysaccharide (EPS) synthesis pathway. The gene encoding PMI in Sphingomonas chungbukensis DJ77 was cloned and expressed in E. coli. The pmi gene is 1,410 nucleotides long and the deduced amino acid sequence shares high homology with other bifunctional proteins that possess both PMI and GDP-mannose pyrophosphorylase (GMP) activities. The sequence analysis of PMI revealed two domains with three conserved motifs: a GMP domain at the N-terminus and a PMI domain at the C-terminus. Enzyme assays using the PMI protein confirmed its bifunctional activity. Both activities required divalent metal ions such as $Co^{2+}$, $Ca^{2+}$, $Mg^{2+}$, $Ni^{2+}$ or $Zn^{2+}$. Of these ions, $Co^{2+}$ was found to be the most effective activator of PMI. GDP-D-mannose was found to inhibit the PMI activity, suggesting feedback regulation of this pathway.

• 한국정보보호학회:학술대회논문집
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• 한국정보보호학회 2002년도 종합학술발표회논문집
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• pp.548-550
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• 2002

본 논문은 PKC(Public Key Certificate)를 이용하여 Privilege Management를 제공하는 모델에 대해 다룬다. 권한관리는 PKC와 AC(Attribute Certificate)를 이용한 PMI가 제시되고 있으나, PMI를 구축하기 위한 비용이 들게 된다. 본 논문에서는 현재 구성되고 있는 PMI 모델과 본 논문에서 제시한 PSL(Privilege Status List)를 이용한 권한 관리모델을 비교, 분석한다.

• Asian Journal for Public Opinion Research
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• 제11권4호
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• pp.274-303
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• 2023

The third-person perception phenomenon can consistently be found in opinion poll news, but it remains unknown what determines the degree of the third-person perception (TPP) about specific election poll news. We investigated how respondents' preferred candidate's status in the poll affects the perceived impact of polling news on both themselves (PMI1) and on others (PMI3) as well as TPP (PMI3 - PMI1). We also examined the effect of subjective political knowledge and the perceived level of political knowledge of others on TPP. An online experiment was conducted in the context of a gubernatorial election in South Korea, in which the leading candidate in the poll and the question order (self-question first vs. other-question first) were manipulated. The results indicated that PMI1 and PMI3 were greater when the respondent's preferred candidate was leading in the poll. TPP did not differ depending on subjective knowledge, but it was greater when the others were non-experts (vs. experts). Lastly, question order was found to be a method factor that affected both PMI1 and PMI3. The theoretical and practical implications of these findings are discussed.

• Bulletin of the Korean Chemical Society
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• 제34권4호
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• pp.1077-1080
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• 2013

Fluorinated polymaleimides with high thermal stability and low optical absorption loss in the optical communication wavelength of $1.55{\mu}m$ were investigated for application in low-loss waveguide materials. The fluorinated polymaleimides were prepared from two monomers phenylmaleimide (H-PMI) and pentafluorophenylmaleimide (F-PMI). All synthesized copolymers had high thermal stability (decomposition temperature $(T_d)=380-430^{\circ}C$). The refractive index of the copolymers could be tuned from 1.4969 to 1.5950 in the TE mode and from 1.4993 to 1.5932 for the TM mode at 632.8 nm by copolymerizing different weight ratios of H-PMI and F-PMI. The refractive index of the copolymers decreased with increasing F-PMI content. In addition, when the amount of F-PMI was increased, optical loss and absorption loss at 632.8 nm and 1550 nm, respectively, decreased.

• 한국컴퓨터정보학회논문지
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• 제25권9호
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• pp.11-20
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• 2020

이 논문에서는 HPC 환경에서 컨테이너의 사용 가능성을 탐구하고 적절한 PMI 라이브러리를 선택하는 기준을 실험을 통해 제안한다. HPC 환경에서 컨테이너 기술의 필요성이 대두되고 있지만 Docker 컨테이너 경우 잠재적인 보안 문제가 있어 HPC 환경에 적합하지 않다는 문제가 있다. 이러한 문제를 해결하기 위해 여러 HPC 컨테이너들이 등장하였지만, 서로 다른 특징들 따른 성능 차이가 발생할 수 있다. 그리하여 본 논문에서는 각 HPC 컨테이너 및 Docker 컨테이너 사이의 성능 차이를 NAS Parallel Benchmark 실험을 통해 측정하고 PMI 라이브러리의 종류에 따른 성능 변화를 확인해보았다. 그 결과 HPC 컨테이너와 Docker 컨테이너는 거의 네이티브와 유사한 성능을 보이거나 경우에 따라 오히려 나은 성능이 관측되었다. 또한 PMI 라이브러리 간의 비교에서는 PMIx가 PMI-2에 비해 모든 조건에서 뛰어난 것은 아닌 것으로 관측된 것을 확인할 수 있었다.

• 공업화학
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• 제28권6호
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• pp.645-648
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• 2017

전량 수입에 의존하고 있는 ABS 수지의 내열성 강화를 위한 화합물인 N-phenylamleimide (PMI)의 상업화를 위한 촉매개발을 완료하였다. Maleic anhydride와 aniline과 반응을 통하여 중간체인 N-phenylmaleamic acid (PMA)를 정량적으로 얻은 후, PMI를 얻기 위한 촉매를 탐색하였다. Zinc acetate/$Et_3N$의 복합 촉매가 단일 산 촉매보다 우수한 성능을 보임을 확인하였다. 개발된 복합 촉매를 사용하여 추가 정제 공정 없이 90% 수율과 99.3%의 순도로 PMI를 합성할 수 있었다.

• 유통과학연구
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• 제15권3호
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• pp.17-25
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• 2017

Purpose - The study is to examine the impact of the US Purchasing Managers' Index (PMI) on Korea and the US industrial economy including the distribution industry. We analyze its effect on the industrial economy centered on the distribution industry using economy indices in Korea and the US. Research design, data, and methodology - The variables are used to analyze the dynamic relationship which occurs among the US PMI, the industrial production index, producer price index, unemployment rate, and manufacturing Inventories Index in Korea and the US from January 1990 to July 2016 using Vector Error Correction Model. Results - As a main result, the impact of the US PMI on all the economy indices both Korea and the US has the same cyclical movement. The US PMI is positively related to the producer price and the industrial production index of Korea and the US, while it is negatively related to unemployment rate, and the manufacturing inventories index in Korea and the US. Conclusions - The US PMI as an advanced index has a power to predict the economies on Korea and the US. In the end, we find that the US PMI has a great impact on Korea and the US industrial economy.

• 토지주택연구
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• 제2권4호
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• pp.315-324
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• 2011

In the merged organization, the efforts of integration such as various PMI activities, etc. are exerted and the performance of PMI can be judged by evaluating the effectiveness of an organization. In this paper, the empirical analysis was conducted to see what effects of 'planned PMI activities' and 'voluntary integration efforts' have on the effectiveness of an organization which is 'Organizational Commitment', 'Job Satisfaction', 'Emotional Integration' and 'Shared Value Recognition'. The survey was made on the employees of LH, which is a representative case of public corporation advancement, and SPSS 17.0 and AMOS 17 were used for the analysis. As a result of the analysis of a structural equation model, it indicated that both 'planned PMI activities' and 'voluntary integration efforts' have direct influence on 4 indices of effectiveness of an organization respectively. In particular, it was found that 'planned PMI activities' affects 'Shared Value Recognition' the most and 'voluntary integration efforts' has the largest effect on 'Emotional Integration'. Through this study, it was verified that voluntary integration efforts of members as well as the planed formal PMI activities are also very important factor of effect on the integration performance of an organization.

• 공업화학
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• 제31권2호
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• pp.226-229
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• 2020

ABS 수지의 내열성 강화를 위한 화합물인 N-phenylmaleimide (PMI)는 원료로서 노란색을 띤다. 그러므로 PMI로 개질된 공중합체는 색을 나타내는데, 이에 따른 사용의 제한이 있다. 이러한 단점을 극복하기 위해 PMI의 대체재로, 원료로서 색을 띠지 않고 PMI와 비슷한 성능을 가진 N-cyclohexylmaleimide (CHMI)의 수요 또한 증가하고 있다. 그러나 CHMI는 합성 중에 여러 반응 부산물이 생성되어 정제 과정이 필수적이며, 수율도 낮아 공업화에 어려움이 있다. 본 연구에서는 이러한 문제점을 개선하고 CHMI를 공업적으로 생산하기 위해 복합 촉매를 개발하였다. 최종적으로 CHMI를 85% 수율과 99.5% 이상의 순도로 합성하였다.