• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.13 no.5
• /
• pp.2754-2767
• /
• 2019

Cloud computing is widely used in information spreading and processing, which has provided a easy and quick way for users to access data and retrieve service. Generally, in order to prevent the leakage of the information, the data in cloud is transferred in the encrypted form. As one of the traditional security technologies, access control is an important part for cloud security. However, the current access control schemes are not suitable for cloud, thus, it is a vital problem to design an access control scheme which should take account of complex factors to satisfy the various requirements for cipher text protection. We present a novel access control scheme based on proxy re-encryption(PRE) technology (PreBAC) for cipher text. It will suitable for the protection of data confidently and information privacy. At first, We will give the motivations and related works, and then specify system model for our scheme. Secondly, the algorithms are given and security of our scheme is proved. Finally, the comparisons between other schemes are made to show the advantages of PreBAC.

• Journal of the Architectural Institute of Korea Planning & Design
• /
• v.35 no.1
• /
• pp.127-138
• /
• 2019

This study was to evaluate the walking speed of elderly people by using the travel route big data collected by travel diary and smart phone application. We analyzed the change of walking behavior in the residential street environments of the elderly whether they had a company or not. We interpreted the meaning based on previous studies. In addition, the characteristics of elderly people's use of the residential street environment were analyzed by comparing the change in spatial speed according to the companion. The result reveals that the usage patterns of the residential street environments change depending on whether they were accompanied or not. First, the elderly tend to do more social activities while walking alone than when they were accompanied. When they were accompanied the social activities occur in empty lot near the residential area. However, the social activities of the elderly occur in open space such as neighborhood park or playground while walking alone. Finally, This study has strength that it empirically analyzes the elderly's walking behavior and usage paths in small outdoor spaces, including residential streets.

• Korean Journal of Ichthyology
• /
• v.34 no.1
• /
• pp.64-70
• /
• 2022

The Eyebar goby, Gnatholepis cauerensis is reported firstly from Korea, based on four specimens (36.3~47.1 mm in SL) collected at depth range of 12~16 m in the southern coastal waters of Jejudo Island, Korea. They are characterized by having mostly ctenoid scales on body, head including cheek, opercle, and middle of predorsal region with cycloid scales, and a unique coloration of yellow blotch with marginally black marking above pectoral fin base as well as transverse black bar below eye. A new Korean name, "Geom-eun-nun-ddi-mang-dug", is proposed for the species.

• Childhood Kidney Diseases
• /
• v.26 no.1
• /
• pp.1-10
• /
• 2022

Congenital isolated hydronephrosis encompasses a spectrum of physiologic states that spontaneously resolve and pathologic obstruction that necessitates surgical intervention. Distinguishing patients whose condition will resolve, those who will require stringent follow-up, and those who will eventually need surgical intervention present a challenge to clinicians, particularly because no unified guidelines for assessment and follow-up have been established. The recognition of the natural course and prognosis of hydronephrosis and a comprehensive understanding of the currently proposed consensus guidelines may aid in multidisciplinary treatment and in providing proper counseling to caregivers. In this review, we aimed to summarize the literature on the grading systems and management strategies for congenital isolated hydronephrosis.

• Journal of Haehwa Medicine
• /
• v.12 no.2
• /
• pp.11-40
• /
• 2004

This study analyzed the contents of the research papers concerning the vascular dementia(VD) recorded in Chinese medical journal published over the period between 1998 and 2000. As a result, the following conclusion was drawn. The Chinese medical category of VD includes Sun-Mang(善忘), Chi-Mae, Jung-Pung-Chi-Mae and so on, and the Major mechanism of the VD is Bon-Heo- Pyo-Sil(state of deficient vital essence and excessive pestilential vapor;本虛標實), Bon(本) includes Sin-Jeong-Heo-Son(腎精虧損), Ki-Hyeol-Hyu-Heo(氣血虧虛) and Pyo(標) includes Dam-Chae-Eo-Jo(痰滯瘀阻), Ki-Chae-Hyeol-Eo(氣滯血瘀), Gan-Yang-Sang-Hang(肝陽上亢). It is mainly used DSM and evidence of brain-vascular disease in brain CT or MRI as the criterion for diagnosis in Western medicine and MMSE, HDS, ADL is used as assistant diagnostic indicator. "Principle of clinical study guidance for treatment of dementia by Chinese medicine, Western medicine"("中藥新藥治療痴呆 病的臨床硏究指導原則") is mainly used as the criterion for diagnosis in Chinese medicine. It is mainly used "Principle of clinical study guidance for treatment of senile disease by Chinese medicine, Western medicine"("中藥新藥治療老年病臨床硏究指導原則"), "Principle of clinical study guidance for treatment of dementia by Chinese medicine, Western medicine" as the criterion for treatment effect evaluation, and score change of MMSE and HDS is used as assistant evaluation indicator. The research papers reported that the use of prescriptions such as Hwan-Chong-Dan(還聰丹), Noi-Hyeol-So-Tong-Gu-Bok-Yaek(腦血疏通口服液), Yik-Gi-Gyo-Nang(益智膠囊), Cheon-Ma-Chok-Gi-Chung-Je(天麻促智沖劑), Sam-Gap-San-Ga-Mi-Bang(三甲散加味方), Seon-Ryong-Gyo-Nang(仙龍膠囊), Seong-Noi-Tang II(醒腦湯II號), Bo-Sin-Geon-Noi-Tang(補腎健腦湯), Ga-Mi-Tong-Gyu-Hyal-Hyeol-Tang(加味通竅活血湯), So-Jo-Yik-Ji-Bang(疏調益智方), Tong-Gyu-Hwal-Hyeol-Tang-Ga-Gam(通竅活血湯加減), Yik-Sin-Seong-Noi-Tang(益腎醒腦湯) led to the high efficacy.

• Journal of IKEEE
• /
• v.20 no.2
• /
• pp.181-183
• /
• 2016

In this work, the merged PiN Schottky(MPS) diodes based silicon carbide(SiC) have been optimized and designed for 1200V diodes by 2D-atlas simulation tool. We investigated the optimized characteristics of SiC MPS diodes such as breakdown voltage and specific on-resistance by varying the doping concentrations of P-Grid/epi-layer and space of P-Grid, which are the most important parameters. The breakdown voltage and specific on-resistance, based on Baliga's Figure Of Merit (BFOM), have been compared with and the SiC-based MPS diodes show improved BFOMs with low values of specific on-resistance and high breakdown voltage. It has been demonstrated 1,200 V SiC MPS diodes will find useful applications in high voltage energy-efficient devices.

• Journal of IKEEE
• /
• v.20 no.2
• /
• pp.177-180
• /
• 2016

The effect of varying thickness of Ag/Ti metal bilayer and annealing time have investigated for controlling self-organized nanoparticles (NPs) on 4H-SiC substrate. In addition, Glass and Si substrate which have different surface energy from SiC were fabricated for analyzing interaction of agglomeration. The results of FE-SEM indicated the different formation behaviors of NPs in various ranges of fabrication condition. The surface energy was measured by using a Contact Angle Analyzer. The formation of network-like NPs was observed on Glass and 4H-SiC, respectively, whereas it was not the case on Si substrates. It has been found that the size of NPs increases with decreasing surface energy, due to particle size-dependent hydrophilic properties of substrates. The different formation behavior was explained by using Young's equation for the contact angles between the metal and different substrates.

• The korean journal of orthodontics
• /
• v.47 no.1
• /
• pp.11-20
• /
• 2017

Objective: This randomized controlled trial aimed to compare the stability of mandibular arch orthodontic treatment outcomes between passive self-ligating and conventional systems during 6 months of retention. Methods: Forty-seven orthodontic patients with mild to moderate crowding malocclusions not requiring extraction were recruited based on inclusion criteria. Patients (mean age $21.58{\pm}2.94years$) were randomized into two groups to receive either passive self-ligating ($Damon^{(R)}$ 3MX, n = 23) or conventional system (Gemini MBT, n = 24) orthodontic treatment. Direct measurements of the final sample comprising 20 study models per group were performed using a digital caliper at the debonding stage, and 1 month, 3 months, and 6 months after debonding. Paired t-test, independent t-test, and non-parametric test were used for statistical analysis. Results: A significant increase (p < 0.01) in incisor irregularity was observed in both self-ligating and conventional system groups. A significant reduction (p < 0.01) in second interpremolar width was observed in both groups. Mandibular arch length decreased significantly (p = 0.001) in the conventional system group but not in the self-ligating system group. A similar pattern of stability was observed for intercanine width, first interpremolar width, intermolar width, and arch depth throughout the 6-month retention period after debonding. Comparison of incisor irregularity and arch dimension changes between self-ligating system and conventional system groups during the 6 months were non-significant. Conclusions: The stability of treatment outcomes for mild to moderate crowding malocclusions was similar between the self-ligating system and conventional system during the first 6 months of retention.

• Korean Journal of Materials Research
• /
• v.17 no.12
• /
• pp.669-675
• /
• 2007

Hydroxyapatite (HAp) and biphasic calcium phosphate (BCP) nano powders were synthesized using the microwave-assisted synthesis process dependent on pH and microwave irradiation time. The average size of a powder was less than 100 nm in diameter. Through in-vitro cytotoxicity tests by an extract dilution method, the HAp and BCP nano powders have shown to be cytocompatible for L-929 fibroblast cells, osteoblastlike MG-63 cells and osteoclast-like Raw 264.7 cells. The activation of osteoblast was estimated by alkaline phosphatase (ALP) activity. When the HAp and BCP were treated to MG-63 cells, alkaline phosphatase activities increased on day 3, compared with those of the untreated cells. Also, the collagen fibers increased when the HAp and BCP powders suspension were treated to MG-63 cells, compared to those of the untreated cells. Quantitative alizarin red S mineralization assays showed a trend toward increasing mineralization in osteoblast cultured with powder suspension. In conclusion, hydroxyapatite and biphasic calcium phosphate appeared to be a bone graft substitute material with optimal biocompatibility and could be further applied to clinical use as an artificial bone graft substitute.

• Journal of Bio-Environment Control
• /
• v.20 no.2
• /
• pp.144-149
• /
• 2011

This research has been carried out to examine the effects of quality promoting agents on global quality and epidermal changes of Chamaecereus silvestrii 'Hee-mang' for quality maintenance of the transportation. D-sorbitol than D-mannitol treatment was effective in a lower reduction of fresh weight in C. silvestrii transportations. Application of diniconazole 200 ppm suppressed growth of C. silvestrii. However, it enabled the possibility of long-tenn plant transportation (up to 50 days) and color formation was also effective. As for epidermis structure of C. silvestrii, hypodermis development was lower compared to Gymnocalycium friedrichii and its long-term transportation became poor quality due to single layered, thin cell wall. Application of diniconazole 200 ppm + D-mannitol 10,000 ppm showed higher growth suppressing effects and diniconazole 200 ppm + wax treatment showed better color formation suitable for quality maintenance and storage purposes for C. silvestrii.