Personalized Service Discovery in Ubiquitous Computing Environments

Kyung-Lang Park,Yoon, U.H.,Shin-Dug Kim IEEE 2009 IEEE PERVASIVE COMPUTING Vol.8 No.1

<P>In ubiquitous computing environments, users want to discover the most appropriate service to support their tasks. Because the most appropriate service depends on user preferences and context, service discovery protocols should personalize results. A service discovery framework based on the virtual personal space (VPS)-that is, a virtual administrative domain of services managed for the user-aims to provide this personalization. In this framework, personal operating middleware embedded in a personal device manages a set of contextually close services in the user's VPS. An inference module supports this management. Laboratory evaluations show that the VPS framework helps users find high-quality, appropriate services.</P>

The effect of plasma on shear bond strength between resin cement and colored zirconia

Park, Chan,Yoo, Seung-Hwan,Park, Sang-Won,Yun, Kwi-Dug,Ji, Min-Kyung,Shin, Jin-Ho,Lim, Hyun-Pil The Korean Academy of Prosthodonitics 2017 The Journal of Advanced Prosthodontics Vol.9 No.2

PURPOSE. To investigate the effect of non-thermal atmospheric pressure plasma (NTAPP) treatment on shear bond strength (SBS) between resin cement and colored zirconia made with metal chlorides. MATERIALS AND METHODS. 60 zirconia specimens were divided into 3 groups using coloring liquid. Each group was divided again into 2 sub-groups using plasma treatment; the experimental group was treated with plasma, and the control group was untreated. The sub-groups were: N (non-colored), C (0.1 wt% aqueous chromium chloride solution), M (0.1 wt% aqueous molybdenum chloride solution), NP (non-colored with plasma), CP (0.1 wt% aqueous chromium chloride solution with plasma), and MP (0.1 wt% aqueous molybdenum chloride solution with plasma). Composite resin cylinders were bonded to zirconia specimens with MDP-based resin cement, and SBS was measured using a universal testing machine. All data was analyzed statistically using a 2-way ANOVA test and a Tukey test. RESULTS. SBS significantly increased when specimens were treated with NTAPP regardless of coloring (P<.001). Colored zirconia containing molybdenum showed the highest value of SBS, regardless of NTAPP. The molybdenum group showed the highest SBS, whereas the chromium group showed the lowest. CONCLUSION. NTAPP may increase the SBS of colored zirconia and resin cement. The NTAPP effect on SBS is not influenced by the presence of zirconia coloring.

Cyclophosphamide Potentiates the Antitumor Effect of Immunization with Injection of Immature Dendritic Cells into Irradiated Tumor

Park, You-Soo,Bae, Jae-Ho,Son, Cheol-Hun,Lee, Kyung-Soo,Kim, Wontaek,Jung, Min Ho,Yang, Kwangmo,Kim, Sun-Hee,Kang, Chi-Dug Informa Healthcare 2011 Immunological investigations Vol.40 No.4

<P>Growth of a tumor on the left flank was suppressed by direct injection of immature DCs (iDCs) into the irradiated tumor on the right thigh (IR//DC). This antitumor immune effect of IR//DC was enhanced by pretreatment with CTX (CTX++IR//DC) and this effect was related with increased number of tumor-specific IFN-γ款 secreting T cells and decreased ratio of CD4<SUP>++</SUP>CD25<SUP>++</SUP>//CD4<SUP>++</SUP> T cells. The treatment with CTX++IR//DC increased or decreased the levels of IL-2 or IL-10, respectively. These results demonstrated that antitumor effect of IR//DC could be augmented by pretreatment with low-dose CTX, suggesting a new antitumor therapeutic modality of chemoradioimmunotherapy.</P>

Evaluation of antibacterial activity and osteoblast-like cell viability of TiN, ZrN and (Ti1-xZrx)N coating on titanium

Kwi-Dug Yun,Hyun-Seung Kim,Hyun-Pil Lim,In-Chol Kang,Kwangmin Lee,Sang-Won Park,Min-Kyung Ji 대한치과보철학회 2015 The Journal of Advanced Prosthodontics Vol.7 No.2

PURPOSE The aim of this study was to evaluate antibacterial activity and osteoblast-like cell viability according to the ratio of titanium nitride and zirconium nitride coating on commercially pure titanium using an arc ion plating system. MATERIALS AND METHODS Polished titanium surfaces were used as controls. Surface topography was observed by scanning electron microscopy, and surface roughness was measured using a two-dimensional contact stylus profilometer. Antibacterial activity was evaluated against Streptococcus mutans and Porphyromonas gingivalis with the colony-forming unit assay. Cell compatibility, mRNA expression, and morphology related to human osteoblast-like cells (MG-63) on the coated specimens were determined by the XTT assay and reverse transcriptase-polymerase chain reaction. RESULTS The number of S. mutans colonies on the TiN, ZrN and (Ti1-xZrx)N coated surface decreased significantly compared to those on the non-coated titanium surface (P<0.05). CONCLUSION The number of P. gingivalis colonies on all surfaces showed no significant differences. TiN, ZrN and (Ti1-xZrx)N coated titanium showed antibacterial activity against S. mutans related to initial biofilm formation but not P. gingivalis associated with advanced periimplantitis, and did not influence osteoblast-like cell viability.

The effect of plasma on shear bond strength between resin cement and colored zirconia

Chan Park†,Seung-Hwan Yoo†,Sang-Won Park,Kwi-Dug Yun,Min-Kyung Ji,Jin-Ho Shin,Hyun-Pil Lim 대한치과보철학회 2017 The Journal of Advanced Prosthodontics Vol.9 No.2

PURPOSE. To investigate the effect of non-thermal atmospheric pressure plasma (NTAPP) treatment on shear bond strength (SBS) between resin cement and colored zirconia made with metal chlorides. MATERIALS AND METHODS. 60 zirconia specimens were divided into 3 groups using coloring liquid. Each group was divided again into 2 sub-groups using plasma treatment; the experimental group was treated with plasma, and the control group was untreated. The sub-groups were: N (non-colored), C (0.1 wt% aqueous chromium chloride solution), M (0.1 wt% aqueous molybdenum chloride solution), NP (non-colored with plasma), CP (0.1 wt% aqueous chromium chloride solution with plasma), and MP (0.1 wt% aqueous molybdenum chloride solution with plasma). Composite resin cylinders were bonded to zirconia specimens with MDP-based resin cement, and SBS was measured using a universal testing machine. All data was analyzed statistically using a 2-way ANOVA test and a Tukey test. RESULTS. SBS significantly increased when specimens were treated with NTAPP regardless of coloring (P<.001). Colored zirconia containing molybdenum showed the highest value of SBS, regardless of NTAPP. The molybdenum group showed the highest SBS, whereas the chromium group showed the lowest. CONCLUSION. NTAPP may increase the SBS of colored zirconia and resin cement. The NTAPP effect on SBS is not influenced by the presence of zirconia coloring.

Influence of preparation depths on the fracture load of customized zirconia abutments with titanium insert

Kwi-Dug Yun,Min-Kyung Ji,Hyun-Pil Lim,Hyun-Seung Kim,Sang-Won Park,Hong-So Yang,Han-Sung Joo 대한치과보철학회 2015 The Journal of Advanced Prosthodontics Vol.7 No.3

PURPOSE This study evaluated the fracture load of customized zirconia abutments with titanium insert according to preparation depths, with or without 5-year artificial aging. MATERIALS AND METHODS Thirty-six identical lithium disilicate crowns (IPS e.max press) were fabricated to replace a maxillary right central incisor and cemented to the customized zirconia abutment with titanium insert on a 4.5×10 mm titanium fixture. Abutments were fabricated with 3 preparation depths (0.5 mm, 0.7 mm, and 0.9 mm). Half of the samples were then processed using thermocycling (temperature: 5-55℃, dwelling time: 120s) and chewing simulation (1,200,000 cycles, 49 N load). All specimens were classified into 6 groups depending on the preparation depth and artificial aging (non-artificial aging groups: N5, N7, N9; artificial aging groups: A5, A7, A9). Static load was applied at 135 degrees to the implant axis in a universal testing machine. Statistical analyses of the results were performed using 1-way ANOVA, 2-way ANOVA, independent t-test and multiple linear regression. RESULTS The fracture loads were 539.28 ± 63.11 N (N5), 406.56 ± 28.94 N (N7), 366.66 ± 30.19 N (N9), 392.61 ± 50.57 N (A5), 317.94 ± 30.05 N (A7), and 292.74 ± 37.15 N (A9). The fracture load of group N5 was significantly higher than those of group N7 and N9 (P<.017). Consequently, the fracture load of group A5 was also significantly higher than those of group A7 and A9 (P<.05). After artificial aging, the fracture load was significantly decreased in all groups with various preparation depths (P<.05). CONCLUSION The fracture load of a single anterior implant restored with lithium disilicate crown on zirconia abutment with titanium insert differed depending on the preparation depths. After 5-year artificial aging, the fracture loads of all preparation groups decreased significantly.

진균성 질염의 한약 훈증 치료에 대한 체계적 문헌 고찰

박경덕 ( Kyung-dug ),배주은 ( Park Ju-eunbae ),윤영진 ( Young-jinyoon ) 대한한방부인과학회 2018 大韓韓方婦人科學會誌 Vol.31 No.3

Objectives: The purpose of this study is to identify the effectiveness of fumigation treatment, provide a clinical basis for fumigation therapy, and develop treatment protocols through consideration of treatment methods and herbal medicines. Methods : We searched for randomized controlled clinical trials using fumigation treatment on mycotic vaginitis in 8 electronic databases such as EMBASE, Pubmed, and CNKI. The results of the studies were analyzed and the risk of bias was assessed by using Cochrane risk of bias tool. A meta-analysis was performed to reveal the effectiveness of fumigation compared to control treatments. Results : We finally selected 5 studies among 54 articles according to inclusion criteria and exclusion criteria. In all selected studies, herbal fumigation was more effective than any control treatment and all the studies were statistically significant. Conclusions: The study provides a basis for applying fumigation treatment to patients with mycotic vaginitis and helps developing a treatment protocol of caring patients of mycotic vaginitis. But the limitation of this study is that the number of studies included is small and quantitative synthesis of all results has not been achieved.

독일의 고용정책 비판과 대안

박경순(Park Kyung-Soon),윤여덕(Yoon Yeu-Dug) 한국사회학회 2006 韓國社會學 Vol.40 No.2

독일의 고용정책은 사회협약에 기초한 노동시장 구조개혁정책으로 특징지을 수 있다. 여기서 관철되고 있는 정책개념은 공급지향정책이다. 이 정책은 독일의 실업을 구조적 실업으로 진단하고, 노동시장의 효율적 배분 메커니즘의 회복을 목적으로 하는 유연화 정책을 유일한 해법으로 제시한다. 이 정책이 겨냥하는 것은 물론 노동조합과 복지국가체계이다. 공급지향정책은 실업을 노동시장의 현상으로 설명하는 신고전주의 노동시장이론 및 뉴케인즈주의 NAIRU 개념을 이론적 준거로 삼고 있다. 그러나 이 노동시장중심적 시각의 ‘지적 오류’는 실질임금을 실업의 원인으로 파악하고 있다는 것이다. 공급지향정책의 유연화전략의 결과 비정규직의 확대, 임금근로자의 소득감소 및 소득불평등 등의 문제가 야기되고 있다. 노동시장중심적 사고에 대해 본 논문은 포스트케인즈주의에 의지하여 수요부족이 실업의 원인임을 주장하며, 정책대안으로 장기적 수요지향정책을 제안한다. 수요지향정책은 시장의 위계구조에서 출발, 자산시장을 분석의 중심에 두고 있다. 자산시장에서 결정된 (균형)이자율은 자본형성을 매개로 생산규모와 고용수준을 결정한다. 즉, 자본주의 화폐경제는 저고용의 균형이라는 특징을 갖는다. 이것이 함의하는 바는 실업은 노동시장과 무관하고, 본질적으로 수요현상이라는 것 그리고 실질임금은 경제과정의 결과이지 결코 실업의 원인이 아니라는 사실이다. 따라서 수요지향정책은 거시정책을 통한 수요증대를 실업해소의 출발점으로 삼는다. The German employment policy can be characterized by structural reform policy based on social pact. Its key concept is a supply-oriented policy. Diagnosing the German unemployment as structural one, it suggests flexibilization of the labor market as a unique solution to restore effective mechanisms of allocation on the labor market and to decrease unemployment. The target is, of course, trade union and the welfare state system. This policy is justified by the neoclassical labor market theory and the newkeynesian NAIRU concept, which identify unemployment as a labor market phenomenon. But a central ‘intellectual failure’ of this labor market-centered view lies in the explanation of real wage as a cause of unemployment. Flexibilization policy has induced expansion of irregular employment, decrease in employee’ income, and deterioration of income distribution. In contrast to it this paper argues that the german unemployment is rooted in demand deficiency, and proposes a long-run demand-oriented policy as a alternative. This demand-oriented policy assumes a hierarchy of markets and sets the analysis focus on the asset market. According to it, economic processes is steered by the asset market. That ist, an (equilibrium) interest rate formed in the asset market generates the amount of capital stock by which the level of production and employment are determined. In other words a capitalist monetary economy is characterized by a equilibrium with underemployment. This implies that unemployment does not relate to the labor market but is a demand phenomenon, and that real wage is not the cause of unemployment but a result of market processes. Therefore a demand-oriented policy takes increasing the demand level through macro-policy as a departure to solve the unemployment problem.

Evaluation of marginal fit of 2 CAD-CAM anatomic contour zirconia crown systems and lithium disilicate glass-ceramic crown

Min-Kyung Ji,Ji-Hee Park,Sang-Won Park,Kwi-Dug Yun,Gye-Jeong Oh,Hyun-Pil Lim 대한치과보철학회 2015 The Journal of Advanced Prosthodontics Vol.7 No.4

PURPOSE This study was to evaluate the marginal fit of two CAD-CAM anatomic contour zirconia crown systems compared to lithium disilicate glass-ceramic crowns. MATERIALS AND METHODS Shoulder and deep chamfer margin were formed on each acrylic resin tooth model of a maxillary first premolar. Two CAD-CAM systems (Prettau®Zirconia and ZENOSTAR®ZR translucent) and lithium disilicate glass ceramic (IPS e.max®press) crowns were made (n=16). Each crown was bonded to stone dies with resin cement (Rely X Unicem). Marginal gap and absolute marginal discrepancy of crowns were measured using a light microscope equipped with a digital camera (Leica DFC295) magnified by a factor of 100. Two-way analysis of variance (ANOVA) and post-hoc Tukey's HSD test were conducted to analyze the significance of crown marginal fit regarding the finish line configuration and the fabrication system. RESULTS The mean marginal gap of lithium disilicate glass ceramic crowns (IPS e.max®press) was significantly lower than that of the CAD-CAM anatomic contour zirconia crown system (Prettau®Zirconia) (P<.05). Both fabrication systems and finish line configurations significantly influenced the absolute marginal discrepancy (P<.05). CONCLUSION The lithium disilicate glass ceramic crown (IPS e.max®press) had significantly smaller marginal gap than the CAD-CAM anatomic contour zirconia crown system (Prettau®Zirconia). In terms of absolute marginal discrepancy, the CAD-CAM anatomic contour zirconia crown system (ZENOSTAR®ZR translucent) had under-extended margin, whereas the CAD-CAM anatomic contour zirconia crown system (Prettau®Zirconia) and lithium disilicate glass ceramic crowns (IPS e.max®press) had overextended margins.

Evaluation of Gene Flow from GM to Non-GM Rice

( Hyun Kyung Bae ),( Moe Moe Oo ),( Ji Eun Jeon ),( Dung Nguyen Tien ),( Sung Aeong Oh ),( Sung Dug Oh ),( Soon Jong Kweon ),( Moo Young Eun ),( Soon Ki Park ) 한국육종학회 2013 Plant Breeding and Biotechnology Vol.1 No.2

Gene flow events from genetically modified (GM) rice to adjacent non-GM rice lines naturally happen in the field. GM rice lines containing desirable agronomic traits such as tolerance to abiotic stresses and resistance to biotic stresses can be used to cross with non-GM cultivated rice and also to wild species of rice. This event can eventually lead to offspring which possess traits that allows a better chance of survival in the field. However this phenomenon has the possibility to produce undesirable effect in the environment surrounding the rice field. The objective of this study was to determine the out-crossing rate of GM rice to cultivated rice. Transgenic rice, Hwangkembyeo (containing beta-carotene enhancing gene and bar gene) and cultivated rice, Nakdongbyeo (mother plant of Hwangkembyeo) were used in this study. Results showed that most gene flow events occurred within 1 m range. In particular, gene flow events mostly happened within 30 cm, while it was rarely observed beyond 90 cm range. The maximum distance for gene flow event was observed at 6 m range however the sharp cut point distance was observed at 60-90 cm range. The prevailing gene flow direction was Northwest (NW) which coincided with the prevailing wind of Southeastern (SE) direction. Wind direction and distance were found to be the most important factors for determining rice out-crossing rate. But for more accurate prevention of GM gene flow, many factors should be considered like the local weather condition, wind direction, wind speed and flowering time.