• Journal of the Korean Statistical Society
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• v.3 no.2
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• pp.85-101
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• 1974

In a Balanced Factorial Experiments (BFE) with n factors $F_1, F_2,\cdots,F_n$ at $m_1, m_2,\cdots,m_n$ levels respectively, Shah [15] has considered the following association scheme: the two treatments are the $(P_1, P_2,\cdot,P_n)$th associates, where $p_i=1$ if the ith factor occurs at the same level in both treatments and $p_i=0$ otherwise; $\lambda_{(p_1,p_2,\cdots,p_n)}$ will denote the number of times these treatments occur together in a block. He has showed that a BFE is partially Blanced Incomplete Block(PBIB) design with repsect to the above association scheme. Kurjian and Zelan [6] have proved that factorial designs possessing a Property A (a particular structure for their matrix NN') are factorially balanced.

• The Journal of the Convergence on Culture Technology
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• v.10 no.2
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• pp.173-179
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• 2024

As a result of analyzing the impact of social capital on social economy awareness, social capital (t=5.169, p<.001) was found to have a significant effect on social economy awareness. The sub-factors trust (t=2.060, p<.05), norms (t=2.536, p<.05), and participation (t=3.033, p<.01) were found to have a significant impact on social economy awareness. As a result of analyzing the impact of community spirit on social economy awareness, community spirit (t=2.533, p<.05) was found to have a significant effect on social economy awareness. The subfactor, awareness of mutual influence (t=2.368, p<.05), was found to have a significant impact on social economy awareness. Based on these results, the following implications were drawn. economic activities.

• Journal of Internet Computing and Services
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• v.7 no.6
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• pp.87-103
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• 2006

Advances in computer and network technology provide new computing environment that were only possible with supercomputers before. In order to provide the environment, a distributed runtime system has to be provided, but most of the conventional distributed runtime systems lack in providing dynamic and flexible system reconfiguration depending on workload variance, due to a static architecture of fixed master node and slave working nodes. This paper proposes and implements a new model for distributed job allocation and management which is a distributed runtime system is P2P environment for flexible and dynamic system reconfiguration. The implemented systems enables job program transfer and management, remote compile and execution among cooperative developers based on P2P standard protocol Jxta platform. Since it makes dynamic and flexible system reconfiguration possible, the proposed method has some advantages in that it can collect and utilize idle computing resources immediately at a needed time for distributed job processing. Moreover, the implemented system's effectiveness and performance increase are shown by applying and processing the crawler jobs, in a distributed way, for collecting a large amount of data needed for internet search.

• Journal of the Korean Society of Radiology
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• v.84 no.5
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• pp.1110-1122
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• 2023

Purpose This study aimed to assess the variability of transrectal shear wave elastography (SWE) using a designed phantom. Materials and Methods In a phantom, the SWE values were examined by two radiologists using agarose and emulsion silicone of different sizes (1, 2, and 3 cm) and shapes (round, cubic) at three depths (1, 2, and 3 cm), two region of interest (ROI) and locations (central, peripheral) using two ultrasound machines (A, B from different vendors). Variability was evaluated using the coefficient of variation (CV). Results The CVs decreased with increasing phantom size. Significant changes in SWE values included; agarose phantom at 3 cm depth (p < 0.001; machine A), 1 cm depth (p = 0.01; machine B), emulsion silicone at 2 cm depth (p = 0.047, p = 0.020; both machines). The CVs increased with increasing depth. Significant changes in SWE values included; 1 cm agarose (p = 0.037, p = 0.021; both machines) and 2 cm agarose phantom (p = 0.047; machine A). Significant differences in SWE values were observed between the shapes for emulsion silicone phantom (p = 0.032; machines A) and between ROI locations on machine B (p ≤ 0.001). The SWE values differed significantly between the two machines (p < 0.05). The intra-/inter-operator agreements were excellent (intraclass correlation coefficient > 0.9). Conclusion The phantom size, depth, and different machines affected the variability of transrectal SWE.

• Biomolecules & Therapeutics
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• v.23 no.2
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• pp.189-194
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• 2015

P450 1A2 is responsible for the metabolism of clinically important drugs and the metabolic activation of environmental chemicals. Genetic variations of P450 1A2 can influence its ability to perform these functions, and thus, this study aimed to characterize the functional significance of three P450 1A2 allelic variants containing nonsynonymous single nucleotide polymorphisms (P450 $1A2^*8$, R456H; $^*15$, P42R; $^*16$, R377Q). Variants containing these SNPs were constructed and the recombinant enzymes were expressed and purified in Escherichia coli. Only the P42R variant displayed the typical CO-binding spectrum indicating a P450 holoenzyme with an expression level of ~ 170 nmol per liter culture, but no P450 spectra were observed for the two other variants. Western blot analysis revealed that the level of expression for the P42R variant was lower than that of the wild type, however the expression of variants R456H and R377Q was not detected. Enzyme kinetic analyses indicated that the P42R mutation in P450 1A2 resulted in significant changes in catalytic activities. The P42R variant displayed an increased catalytic turnover numbers ($k_{cat}$) in both of methoxyresorufin O-demethylation and phenacetin O-deethylation. In the case of phenacetin O-deethylation analysis, the overall catalytic efficiency ($k_{cat}/K_m$) increased up to 2.5 fold with a slight increase of its $K_m$ value. This study indicated that the substitution P42R in the N-terminal proline-rich region of P450 contributed to the improvement of catalytic activity albeit the reduction of P450 structural stability or the decrease of substrate affinity. Characterization of these polymorphisms should be carefully examined in terms of the metabolism of many clinical drugs and environmental chemicals.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.406-408
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• 2003

현재 많이 사용되고 있는 P2P 개념으로는 순수 F2P와 변형 F2P구조가 있다. 순수 P2P의 모델에는 Gnutella와 Ktella 등의 형태가 존재하고 변형 P2P로는 무수히 많은 형태가 존재한다. 순수 P2P 모델의 경우에는 정보 공유에서 연결성을 장점으로 Gnutella의 형태를 응용한 형태로 많이 사용되고 있지만 정보를 검색하거나 제공하기 위해 많은 트래픽을 소모하게 된다. 이와는 달리 변형 P2P모델들 중 정보 공유 모델들이 존재하는데 이 모델들은 사용자에게 효율적이고 빠른 검색과 색인을 제공하기 위해 기존의 서버/클라이언트 형태를 취하고 있지만 제공하는 서버의 능력에 의존할 수 밖에 없다. 파일공유 모델의 Peer들에 대해 연결성 유지를 위한 많은 부하와 사용자에 있어서 그룹에 대한 형태의 문제점 그리고 서버의 Fail로 인한 비 연결성에 대한 문제점을 해결하기 위해 본 논문에서는 라우팅 프로토콜 기법에서의 접근과 계층적 구조를 적용하고 Backup 시스템을 포함해서 효율적인 그룹관리와 동적인 서버의 지정으로 신뢰성을 유지하기 위한 시스템을 설계하고 구현하였다.

• The Korean Nurse
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• v.31 no.1
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• pp.68-87
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• 1992

The purpose of this study is to develop a patient care standard which is the basis of unit based quality assurance. The subjects were 570 nurses of 6 hospitals is Seoul. Patient Care Standards were developed from 3 times of clinical Nurses Association's workshop & the joint meeting of Clinical Nurses Association & the Korean Nurses Academic Socity of Nursing Administration. Respondents were instructed to rate of the 2 types of 5 - point Likert type questionnaire(one is the level of perceived importance, the other is the level of actual performance) Findings of this study were as follows 1. As a results of reliability analysis, each questionnaire ranged from $\alpha$=0.79 to 0.94