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Search Results: 1 - 10 of 10963 matches for " Mi-Gyoung Park "
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Age-hardening by grain interior and grain boundary precipitation in an Au-Ag-Pt-Zn-In alloy for multipurpose dental use
Joo-Hee Park,Mi-Hyang Cho,Mi-Gyoung Park,Yong Hoon Kwon,Hyung-Il Kim,Hyo-Joung Seol
Gold Bulletin , 2010, DOI: 10.1007/BF03215001
Abstract: The complex precipitation mechanisms related to the age-hardening of Cu-free Au-Ag-Pt-Zn-In alloy for multipurpose dental use was studied by means of hardness test, X-ray diffraction (XRD) studies, field emission scanning electron microscopic (FE-SEM) observations, energy dispersive spectrometer (EDS) analysis, and electron probe microanalysis (EPMA). The early diffusion and then clustering of the In-concentrated phase in the grain interior, together with the early diffusion and then ordering of the PtZn phase in the grain boundary, introduced the internal strains in the Au-Ag-rich α1 matrix, resulting in the hardening process. As the Au-Ag-rich α 1 ’ and PtZn β lamellarforming grain boundary reaction progressed, the phase boundaries between the solute-depleted face-centered cubic (FCC) α 1 ’ matrix and the face-centered tetragonal (FCT) PtZn β precipitate reduced, resulting in softening. In the particlelike structures composed of the major Pt-Au-rich α2 phase and the minor Pt-Zn-rich α3 phase, the separation of In and Zn progressed producing the In-increased Pt-Au-rich α 2 ’ phase and the Zn-increased PtZn α3′ phase with aging time without restraining the softening. The miscibility limit by complex systems of Au-Pt, Ag-Pt, Au-In and In-Zn resulted in the phase transformation and related microstructural changes.
Age-hardening by miscibility limit in a multi-purpose dental gold alloy containing platinum
Hyo-Joung Seol,Joo-Hee Park,Ri-Mo Ku,Mi-Gyoung Park,Yong Hoon Kwon,Hyung-Il Kim
Gold Bulletin , 2010, DOI: 10.1007/BF03214965
Abstract: This study examined the age-hardening by miscibility limit in a multi-purpose dental gold alloy containing platinum. The hardness increased rapidly in the initial stage of the aging process, reached the maximum value, then decreased continuously with aging time. The significant hardness increase resulted from the heterogeneous precipitation of the Pt-rich β phase from the grain boundary of the Au-rich α1 matrix due to the miscibility limit of Au-Pt system. With increasing aging time, the fine Pt-rich β precipitates covered almost the whole matrix, and by further aging, the precipitates grew coarse. The microstructural coarsening reduced the interface between the Au-rich α1 matrix and the Pt-rich β precipitates, which released the lattice strains between the two phases, resulting in a softening effect. In the later stage of aging process, the Au-containing Pt3In particle-like structure was transformed into the Au-depleted particle-like structure containing relatively large amounts of Cu resulting from the overlapping miscibility limit of both Au-Pt and Ag-Cu systems, which was responsible for the slow decreasing rate in hardness in the later stage of aging.
Clues to Occult Cancer in Patients with Ischemic Stroke
Suk Jae Kim, Jae Hyun Park, Mi-Ji Lee, Yun Gyoung Park, Myung-Ju Ahn, Oh Young Bang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0044959
Abstract: Background We hypothesized that hidden malignancy could be detected in patients with cryptogenic stroke without active cancer when they showed the distinctive characteristics of cancer-related stroke. Methods and Findings Among 2,562 consecutive patients with acute ischemic stroke, patients with cryptogenic stroke were analyzed and categorized into two groups according to the presence of active cancer: cryptogenic stroke with active cancer (cancer-related stroke, CA-stroke) group and without active cancer (CR-stroke) group. Patients with active lung cancer without stroke were also recruited for comparison purposes (CA-control). Clinical factors, lesion patterns on diffusion-weighted MRI (DWI), and laboratory findings were analyzed among groups. A total of 348 patients with cryptogenic stroke were enrolled in this study. Among them, 71 (20.4%) patients had active cancer at the time of stroke. The D-dimer levels were significantly higher in patients with CA-stroke than those with CR-stroke or CA-control (both p<0.001). Regarding lesion patterns, patients with CA-stroke mostly had multiple lesions in multiple vascular territories, while more than 80% of patients with CR-stroke had single/multiple lesions in a single vascular territory (P<0.001). D-dimer levels (OR 1.11 per 1 μg/mL increase; 95% CI 1.06–1.15; P<0.001) and DWI lesion patterns (OR 7.13; 95% CI 3.42–14.87; P<0.001) were independently associated with CA-stroke. Workup for hidden malignancy was performed during hospitalization in 10 patients who showed elevated D-dimer levels and multiple infarcts involving multiple vascular territories but had no known cancer, and it revealed hidden malignancies in all the patients. Conclusion Patients with CA-stroke have distinctive D-dimer levels and lesion patterns. These characteristics can serve as clues to occult cancer in patients with cryptogenic stroke.
Hospice care compliance of nurses working at a hospice ward in Korea  [PDF]
Hyun Gu Lee, Heeok Park, Young Mi Chun
Open Journal of Nursing (OJN) , 2014, DOI: 10.4236/ojn.2014.42009
Abstract:


Purpose: The purpose of this study was to investigate the hospice care compliance of nurses working at a hospice ward and provide meaningful data to improve the hospice care compliances. Methods: Participants included 104 nurses working at the hospice ward of the hospital located at P and D cities. Data was collected from February to March 2012. The level of hospice care compliance was measured using Bae (2000)’s questionnaires. Data were analyzed with descriptive statistics, t-test, one-way ANOVA and Scheffè test using SPSS/WIN 18.0 program. Results: The level of hospice care compliance in hospice nurses working at a hospice ward was high (3.25 out of 4). In hospice care compliance, the physical area was highest, followed by the emotional, spiritual, and social areas. Hospice care compliance was significantly different according to age, marital status, education, religion, importance of religion, job position, job satisfaction and life satisfaction. Hospice care compliance was also significantly different according to the nurses’ experience of death, having license or certification related to hospice care and experiences related to clients’ death. Conclusions: The findings of this study showed that the level of hospice care compliance was high and the hospice care compliance in South Korea was primarily focused on physical care. Considering that spiritual needs are important needs in hospice clients, hospice nurses need to focus on those aspects more. To improve the quality of hospice care compliance in the hospice nurses, programs to increase hospice nurses’ job and life satisfaction are needed.


Survivability Analysis of A Cluster System with 4th Generation Security Mechanism: Regeneration
Khin Mi Mi Aung,Kiejin Park,Jong Sou Park
International Journal of Network Security , 2006,
Abstract: Cluster systems have been gradually more popular and are being broadly used in a variety of applications. On the other hand, many of those systems are not tolerant to system failures and moreover we cannot prevent all faults and attacks. In this paper, we analyze a cluster system's ability to maintain the critical services even in face of faulty and intrusions with 4th Generation Security Mechanism: Regeneration. The experiments have been demonstrated that the proposed mechanism can be used to analyze and proactively manage the effects of cluster network faults and attacks, and restore accordingly. The survivability level is greatly enhanced by the addition of functionality to targeted systems while maintaining the critical service and avoiding large incremental costs.
Star operations and Pullbacks
Marco Fontana,Mi Hee Park
Mathematics , 2003,
Abstract: In this paper we study the star operations on a pullback of integral domains. In particular, we characterize the star operations of a domain arising from a pullback of ``a general type'' by introducing new techniques for ``projecting'' and ``lifting'' star operations under surjective homomorphisms of integral domains. We study the transfer in a pullback (or with respect to a surjective homomorphism) of some relevant classes or distinguished properties of star operations such as $v-, t-, w-, b-, d-,$ finite type, e.a.b., stable, and spectral operations. We apply part of the theory developed here to give a complete positive answer to a problem posed by D. F. Anderson in 1992 concerning the star operations on the ``$D+M$'' constructions.
On the Star Class Group of a Pullback
Marco Fontana,Mi Hee Park
Mathematics , 2005,
Abstract: For the domain $R$ arising from the construction $T, M,D$, we relate the star class groups of $R$ to those of $T$ and $D$. More precisely, let $T$ be an integral domain, $M$ a nonzero maximal ideal of $T$, $D$ a proper subring of $k:=T/M$, $\phi: T\to k$ the natural projection, and let $R={\phi}^{-1}(D)$. For each star operation $\ast$ on $R$, we define the star operation $\ast_\phi$ on $D$, i.e., the ``projection'' of $\ast$ under $\phi$, and the star operation ${(\ast)}_{_{T}}$ on $T$, i.e., the ``extension'' of $\ast$ to $T$. Then we show that, under a mild hypothesis on the group of units of $T$, if $\ast$ is a star operation of finite type, $0\to \Cl^{\ast_{\phi}}(D) \to \Cl^\ast(R) \to \Cl^{{(\ast)}_{_{T}}}(T)\to 0$ is split exact. In particular, when $\ast = t_{R}$, we deduce that the sequence $ 0\to \Cl^{t_{D}}(D) {\to} \Cl^{t_{R}}(R) {\to}\Cl^{(t_{R})_{_{T}}}(T) \to 0 $ is split exact. The relation between ${(t_{R})_{_{T}}}$ and $t_{T}$ (and between $\Cl^{(t_{R})_{_{T}}}(T)$ and $\Cl^{t_{T}}(T)$) is also investigated.
Angiomyofibroblastoma of the vulva: A case report with literature review  [PDF]
Jung Ho Park, Mi Kyung Shin, Maria Lee, Sung Taek Park, Sung-Ho Park, Hong-Bae Kim
Case Reports in Clinical Medicine (CRCM) , 2013, DOI: 10.4236/crcm.2013.23060
Abstract:

Angiomyofibroblastoma (AMF) is a rare kind of soft tissue tumor that occurs predominantly in the vulva. Due to their location, clinicians often confuse AMF with Bartholin’s cyst or perineal hernia. Radiological evaluation is performed to rule out perineal hernia and invasive neoplasm. Like other benign mesenchymal tumors of vulva, AMF shows indolent behavior and rarely recurs after complete surgical excision.

Nutritional modulators of ulcerative colitis: Clinical efficacies and mechanistic view
Mi-Kyung Sung,Mi-Young Park
World Journal of Gastroenterology , 2013, DOI: 10.3748/wjg.v19.i7.994
Abstract: Ulcerative colitis (UC) is an inflammation-associated disease of the colon and rectum. The onset and progress of the disease are directly influenced by the nature of the intestinal microflora, the intestinal barrier function, and the immunological responses of the host. The epithelial invasion of pathogenic bacteria due to excess contact and/or barrier dysfunction is related to inflammation mediated by intestinal immune responses. Although the etiology of UC is not clearly understood, recent studies have shown a rising incidence of UC worldwide, and this phenomenon is more prominent in Asian countries and in Asian immigrants in Western countries. The increased prevalence of UC also contributes to an increased risk of developing colorectal cancer. Environmental factors, including changes in dietary habits, have been suggested as major risk factors of UC. A systematic review showed a negative association between UC risk and vegetable intake, whereas total fat, omega-6 fatty acids and meat intake were positively associated with an increased risk of UC. Individual dietary factors and energy balance have been suggested as having important roles in inducing changes in the microbial population and intestinal barrier integrity and in regulating inflammatory immune responses, directly or indirectly. Excess energy intake is now known to increase pathogenic microbial populations. Likewise, the application of appropriate probiotics may reverse the pathogenic progression of the disease. In the meantime, dietary anti-inflammatory compounds, including omega-3 fatty acids and other phytochemicals, may directly suppress inflammatory responses in the course of UC development. In this review, the increased prevalence of UC and its management are interpreted from the standpoint of nutritional modulation to regulate the intestinal microflora population, intestinal epithelium permeability, and inflammatory responses.
The nestling diet of fairy pitta pitta nympha on Jeju Island, Korea  [PDF]
Eun-Mi Kim, Chan-Ryul Park, Chang-Wan Kang, Se-Jae Kim
Open Journal of Ecology (OJE) , 2012, DOI: 10.4236/oje.2012.24021
Abstract: The nestling diet of the Fairy Pitta (pitta nympha) was studied by videotaping during breeding period in Jeju Island, 2009. Earthworms of several species were the most common food resources for nestlings, averaging 82% of all items, followed by 4% of Homoptera larvae. The remaining was only rarely recorded, including Lepidopteran larvae and adults, slugs, spiders, beetle adults and larvae (Coleoptera) and grasshoppers. Adults provided the number of preys ranging from 1 to 7 items to chicks per one visit. The average value of prey number per visit was 3.0 (SD = 1.38). The estimated average length of prey was 5.7 cm (SD = 2.85), and 96% of the food items were smaller than 10 cm. The staying time for feeding in an early stage was longer than other stages. Provision rate at a forenoon (mean ± SD, 14.7 ± 4.92) and an afternoon time (15.8 ± 5.30) was not significantly higher than that of noon time (11.7 ± 4.49). These results provide basic information for conservation action of international endangered species of this species.
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