Kang-neung, South Korea

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Witek-Krowiak A.,Wroclaw University of Technology | Harikishore Kumar Reddy D.,Catholic Kwandong University
Bioresource Technology | Year: 2013

In the present study soybean meal (SBM) waste has been used for the removal Cr(III) and Cu(II) from aqueous solutions. Effect of variable parameters including pH, contact time, biomass dose and initial concentration of metal ions were studied. Biosorption kinetics was very fast and the kinetics data were successfully modeled using nonlinear pseudo-second-order model. A series of isotherm experiments revealed that pH 5 favored Cr(III) and Cu(II) biosorption and the affinity order of SBM was Cu(II) > Cr(III). Biosorption mechanism was confirmed by the functional group blocking, FTIR and scanning electron microscopy/energy-dispersive X-ray results. The biosorption mechanism was due to (i) ion-exchange, (ii) chelation by carboxyl and hydroxyl groups present on the SBM surface, (iii) further precipitation of metal ions on the surface of biomass. Our results revealed that SBM could be employed as an effective and low-cost biosorbent for removal of Cr(III) and Cu(II) from contaminated effluents. © 2012 Elsevier Ltd.

Choi H.-J.,Catholic Kwandong University
World Journal of Microbiology and Biotechnology | Year: 2014

The aim of present investigation is to assess the effect of illumination area and distance of an optical panel (OP) on the growth of microalgae with simultaneous removal of nutrients. Four different distances of OPs were used i.e. 225 mm OP (Run 1), 150 mm OP (Run 2), 112.5 mm OP (Run 3) and 90 mm distance OP (Run 4) in the photobioreactor (PBR) operations. The PBR was equipped with an OP and operated with a total volume of 37-l. A batch culture was prepared using an initial cell concentration of 1.12 ± 0.05 g l-1. The experiments were conducted at neutral pH (7.2 ± 0.3) under dark and light cycles of 8 and 16 h, respectively. The diffuse light intensity was recorded as 91, 93, 95 and 98 % for Run 1, Run 2, Run 3 and Run 4, respectively, at a 300 mm depth level in the PBR. The chlorophyll content per cell was found to be an average of 701, 721, 785 and 808 fg for Run 1, Run 2, Run 3 and Run 4, respectively. High chlorophyll content per cell and diffuse light intensity was observed for Run 4 compared to other fractions. However, Run 3 sample possessed approximately 10.51 % higher biomass growth along with 15.22 % chemical oxygen demand, 18.15 % total nitrogen 2.37 % NH4-N, 15.1 % total phosphorus and 15.05 % PO4-P more removal than the Run 1. These findings suggest that in terms of economic consideration and efficiency of nutrients removal, Run 3 is found to be more effective than other samples. Moreover, an enhanced growth of Chlorella vulgaris could further be utilized as a potential biodiesel source. © 2014 Springer Science+Business Media Dordrecht.

Lee S.M.,Catholic Kwandong University | Tiwari D.,Mizoram University
Applied Clay Science | Year: 2012

The aim of this communication is to understand the different aspects and needs of the modification of micro and meso-porous clay or clay based materials in particular to its application in the environmental remediation technologies. The review is mainly focused on the remediation of contaminated/polluted aquatic environment because of recent global interest towards the underlying detriment of water quality around the globe and possible technological implications of these materials. The work presented here critically evaluated the role of organo-modified or inorgano-organo-clay or the clay based nano-materials/composites, which is perhaps an emerging area of nano-technology applied into the environmental remediation strategies. The modification of clay materials at the nano-scale perhaps received a greater interest in recent past as to employ it in several waste water treatment methods. Moreover, the organo-/or inorgano-organo-clay materials used in the development of the electrochemical sensors are exaggerates further, the applicability of these materials in the remote sensing of various pollutants present in the aquatic environment. © 2012 Elsevier B.V.

The human papillomavirus (HPV) vaccination rate in Korea is very low because a school-based HPV vaccination program has not yet been introduced. This study was designed to assess HPV knowledge, compare the health beliefs toward HPV vaccination and intention to recommend HPV vaccination for girls and boys, and identify the factors influencing the intention to recommend HPV vaccination for girls and boys among Korean health teachers. A descriptive cross-sectional study design was employed, in which 757 health teachers who worked at elementary, middle, high, and special schools in Korea participated via an online survey. A self-administered, structured questionnaire was applied, which included items on sociodemographics, HPV awareness, HPV knowledge, perceived benefits, susceptibility, severity, and barriers toward HPV vaccination for girls and boys, and intention to recommend HPV vaccination for girls and boys. The rate of correct HPV knowledge items ranged from 5.2% to 89.2%; 23.4% of the health teachers answered that they had ever taught about HPV, 97% answered that both boys and girls should receive HPV vaccination, and 47.6% answered that the best time for HPV vaccination is when students are at middle school. There were differences regarding the perceived benefits (Z= -7.69, p< 0.001), perceived susceptibility (Z= -3.37, p= 0.001), perceived severity (Z= -4.13, p< 0.001), and perceived barriers (Z= -4.90, p< 0.001) toward HPV vaccination, and regarding intention to recommend HPV vaccination (Z= -15.21, p< 0.001) for girls and boys. Factors associated with the intention to recommend HPV vaccination for girls were the HPV vaccination status of the health teachers' children [odds ratio (OR) = 4.24, 95% confidence interval (95% CI) = 1.14-15.72], and the teachers' Pap-test experience (OR= 2.50, 95% CI = 1.05-5.91), perceived benefits (OR = 3.30, 95% CI = 1.26-7.40), perceived susceptibility (OR = 3.25, 95% CI = 1.58-6.68), and perceived barriers (OR = 0.51, 95% CI = 0.30-0.99); these factors for boys were the health teachers' career duration (OR = 1.61, 95% CI = 1.12-2.32), HPV knowledge (OR = 1.45, 95% CI = 1.01-2.09), perceived benefits (OR = 3.46, 95% CI = 2.27-5.26), perceived susceptibility (OR = 1.55, 95% CI = 1.04-2.29), and perceived severity (OR = 1.71, 95% CI = 1.15-2.56). General awareness of HPV should be increased and more specific information about HPV-including that related to vaccination of boys and men-should be provided for health teachers. Although a school-based HPV vaccine program has yet to be introduced in Korea, health teachers should possess general knowledge about HPV and HPV vaccination, and differences in attitudes and intentions related to HPV vaccination between girls and boys should be reduced. © 2012 Elsevier Ltd.

Yi S.-W.,Catholic Kwandong University
Journal of Preventive Medicine and Public Health | Year: 2013

Objectives: The aim of this study was to investigate the association between Vietnam experience including exposure to military herbicides and cancer incidence in Korean Vietnam War veterans. Methods: The cancer cases of 185 265 Vietnam veterans from January 1, 1992 to December 31, 2003 were confirmed from the Korea National Cancer Incidence Database. The age-adjusted incidence and standardized incidence ratios (SIRs) were calculated using the male population during 1992 to 2003 as a standard population. Results: The age-adjusted overall cancer incidence per 100 000 person-years was 455.3 in Vietnam veterans. The overall cancer incidence was slightly yet significantly lower in veterans (SIR, 0.97; 95% confidence interval, 0.95 to 0.99) than in the general population. The overall cancer incidence in enlisted soldiers was not lower (SIR, 1.00), whereas that in officers was significantly lower (SIR, 0.87) than in the general population. The incidences of prostate cancer and T-cell lymphoma in all veterans, and lung cancer and bladder cancer in enlisted soldiers, and colon cancer and kidney cancer in non-commissioned officers, and colon cancer, kidney cancer, and prostate cancer in officers, were higher than in the general population. The SIR for overall cancer among Vietnam veterans rose from 0.92 for 1992-1997 to 0.99 for 1998-2003. Conclusions: The overall cancer incidence in Vietnam veterans was not higher than in the general male population. Vietnam veterans and military rank subcohorts experienced a higher incidence of several cancers, including prostate cancer, T-cell lymphoma, lung cancer, bladder cancer, kidney cancer, and colon cancer than the general population. The SIR for overall cancer increased over time in Vietnam veterans. Copyright © 2013 The Korean Society for Preventive Medicine.

Reddy D.H.K.,Catholic Kwandong University | Lee S.-M.,Catholic Kwandong University
Advances in Colloid and Interface Science | Year: 2013

Magnetic chitosan composites (MCCs) are a novel material that exhibits good sorption behavior toward various toxic pollutants in aqueous solution. These magnetic composites have a fast adsorption rate and high adsorption efficiency, efficient to remove various pollutants and they are easy to recover and reuse. These features highlight the suitability of MCCs for the treatment of water polluted with metal and organic materials. This review outlines the preparation of MCCs as well as methods to characterize these materials using FTIR, XRD, TGA and other microscopy-based techniques. Additionally, an overview of recent developments and applications of MCCs for metal and organic pollutant removal is discussed in detail. Based on current research and existing materials, some new and futuristic approaches in this fascinating area are also discussed. The main objective of this review is to provide up-to-date information about the most important features of MCCs and to show their advantages as adsorbents in the treatment of polluted aqueous solutions. © 2013 Elsevier B.V.

Koo Y.J.,Catholic Kwandong University
Surgical endoscopy | Year: 2011

Laparoscopic myomectomy rather than abdominal myomectomy has been well documented as a treatment option for uterine myomas. However, laparoscopic myomectomy has serious limitations in two of its steps: excision of myoma with strong traction and suturing of the uterine defect. These steps are a challenge even for experienced surgeons. The authors introduce a simple but highly effective technique for excision of myoma and suturing using standard instrumentation in laparoscopic myomectomy. After incision of the myometrium, the myoma pseudocapsule is separated by insertion of the dissector tip and scissors into the myoma. After completion of myoma enucleation, the surgeon makes a U-shaped hole of suture material with forceps for an interlocking suture, and the first assistant holds the stitch to maintain the suture tension throughout the repair. From February 2010 to August 2010, 43 patients with a diagnosis of uterine myoma underwent laparoscopic myomectomy by single surgeon using the aforementioned procedure. The mean diameter of the myoma was 6.3 cm (range, 4-9 cm), and multiple myomas were observed in 19 cases (44.2%). As a result, the mean operative time was 75.9 min (range, 35-155 min), and the hospital stay was 2.7 days (range, 2-5 days). The blood loss was 137.2 ml (range, 50-250 ml), and the hemoglobin decline on the first day after surgery was 1.5 mg/dl (range, 0.1-3.6 mg/dl). Postoperative fever higher than 37.7°C was the most commonly observed morbidity (ten patients, 23.3%). How- ever, no cases had conversion to laparotomy or major complications requiring reoperation or readministration during the mean follow-up period of 5.9 months (range, 3-9 months). Laparoscopic myomectomy can be performed easily and effectively by forceps insertion and continuous interlocking suture using standard instruments.

Catholic Kwandong University | Date: 2015-01-21

The present invention relates to a trans-platform apparatus including a main platform and an operating device. The trans-platform apparatus of the present invention has the advantage of performing complex and various operations by inserting a maximum number/size of operating devices through a minimal number of openings within an operating space. In addition, since the trans-platform apparatus of the present invention does not use an additional connecting member for a spin shaft, the configuration thereof is further simplified, the operation thereof is easier, and power can be efficiently transmitted to an operating means. The trans-platform apparatus of the present invention is applicable to various fields including medical devices, and an engine room or a device for operating the inside of a radiator.

Catholic Kwandong University | Date: 2013-12-26

The present invention relates to a method for producing complex reality three-dimensional images and a system for same, the method comprising: (a) a step for determining first reality three-dimensional spatial coordinates for a three-dimensional image of a human body; (b) a step for determining second reality three-dimensional spatial coordinates for an image of an item of medical equipment; (c) a step for obtaining a three-dimensional image of the area surrounding the medical equipment, from an imaging means in the medical equipment, and determining third reality three-dimensional spatial coordinates for said image; (d) a step for examining an image that is at the same coordinates in the three kinds of three-dimensional spatial coordinates; and (e) a step for producing a complex reality three-dimensional image by selecting the one image that is at the same coordinates, if there is one image at the same coordinates, or selecting the necessary image or images from among a plurality of images, if there are multiple images at the same coordinates.

Catholic Kwandong University | Date: 2012-08-30

The present invention relates to a device for three dimensional endoscopic surgery, and more specifically, to a device for three dimensional endoscopic surgery, wherein therapeutic tools including an endoscope can be inserted into the human body through one main tube, and the therapeutic tools can be spread outward to be utilized in the human body, thereby minimizing an incision site in case of surgical operation while allowing various medical operations to be performed using one main tube. The present invention is a device for endoscopic surgery comprising: a main tube which is inserted into the body of a patient; first and second cameras which are inserted in a row into the main tube; a light source portion which is inserted between the first and second cameras; and a therapeutic tool which is located below the second camera to be inserted into the main tube.

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