Do Yoon Kim

Gachon University, Sŏngnam, Gyeonggi Province, South Korea

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Publications (16)48.59 Total impact

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    ABSTRACT: The performance and photocatalytic activity of the well-known CdS/ZnO nanorod array system were improved significantly by the layer-by-layer heterojunction structure fabrication of a transparent conductive oxide (TCO) CdO layer on the CdS/ZnO nanorods. Accordingly, a CdO layer with a thickness of approximately 5–10 nm can be formed that surrounds the CdS/ZnO nanorod arrays after annealing at 500 °C under air. At an external potential of 0.0 V vs. Ag/AgCl, the CdO/CdS/ZnO nanorod array electrodes exhibit an increased incident photon to conversion efficiency, which is significantly higher than that of the CdS/ZnO nanorod array electrodes. The high charge separation between the electrons and holes at the interfaces of the heterojunction structure results from the specific band energy structure of the photoanode materials, and the unique high conductivity of the CdO layer is attributed to the suppression of electron–hole recombination; this suppression enhances the photocurrent density of the CdO/CdS/ZnO nanorod arrays. The photoresponse of the electrodes in an electrolytic solution without sacrificial agents indicated that the CdO layer also has the ability to suppress the well-known photocorrosive behavior of CdS/ZnO nanorods.
    ChemSusChem 10/2014; · 7.48 Impact Factor
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    ABSTRACT: Single crystalline orthorhombic phase tungsten trioxide monohydrate (O-WO3•H2O, space group: Pmnb) nanoplates with clear morphology and uniform size distribution have been synthesized by hydrothermal method, and fabricated on the surface of fluorine doped tin oxide (FTO) coated glass substrates with selective exposure of crystal-facet by finger rubbing method. The rubbing method can easily arrange the O-WO3•H2O nanoplates along (020) facet on FTO substrate. The O-WO3•H2O nanoplate can be converted to monoclinic phase WO3 (γ-WO3, space group: P21/n) with dominant crystal facet of (002) without destroying the plate structure. Crystal morphologies, structures, and components of the films have been determined by SEM, TEM, XRD, Raman, XPS, etc. The band gap energies of the O-WO3•H2O and γ-WO3 nanoplates are determined as ca. 2.26 and 2.49 eV, respectively. Photoelectrochemical properties of the films the films with (002) dominant crystal facet have also been checked for discussion of further application in water oxidation. The advantage of rubbed (020) facet dominant film is investigated by comparing to one spin-coated γ-WO3 thin film with same thickness via photoelectrochemical characterizations such as photocurrent, IPCE and EIS.
    Crystal Growth & Design 10/2014; · 4.69 Impact Factor
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    ABSTRACT: Clinical usefulness of sentinel lymph node (SLN) mapping in colorectal cancer remains controversial. The aim of this study is to evaluate the accuracy of the SLN mapping technique using serial sectioning, and to compare the results between ex vivo and in vivo techniques.
    Annals of surgical treatment and research. 09/2014; 87(3):118-22.
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    ABSTRACT: Preoperative localization is the most important preparation for laparoscopic surgery. Preoperative marking with India ink has widely been used and is considered to be safe and effective. However, India ink can cause significant inflammation, adhesions and bowel obstruction. Therefore, we have used the patient's blood instead of the ink since 2011. In this retrospective study, we wanted to examine the feasibility of preoperative localization by using the patient's blood.
    Annals of coloproctology. 06/2014; 30(3):115-7.
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    ABSTRACT: Membranes with nano-apertures are versatile templates that possess a wide range of electronic, optical and biomedical applications. However, such membranes have been limited to silicon-based inorganic materials to utilize standard semiconductor processes. Here we report a new type of flexible and free-standing polymeric membrane with nano-apertures by exploiting high-wettability difference and geometrical reinforcement via multiscale, multilevel architecture. In the method, polymeric membranes with various pore sizes (50-800 nm) and shapes (dots, lines) are fabricated by a hierarchical mould-based dewetting of ultraviolet-curable resins. In particular, the nano-pores are monolithically integrated on a two-level hierarchical supporting layer, allowing for the rapid (<5 min) and robust formation of multiscale and multilevel nano-apertures over large areas (2 × 2 cm(2)).
    Nature Communications 01/2014; 5:3137. · 10.74 Impact Factor
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    ABSTRACT: Metastatic colon cancer patients are treated with the chemotherapy regimens, FOLFOX and FOLFIRI, in either order. So far, we cannot predict the response of chemotherapeutic agent, so it is necessary to find which regimen is adequate before starting chemotherapy. Enrolled patients are randomized into either conventional treatment or planned treatment preceded by pretreatment genetic analysis. Blood samples of patients in planned treatment group (N = 53) were analyzed for the genetic polymorphism before selection of chemotherapeutic agents. Target genes were XPD-751, GSTP-1-105, XRCC1-399 for oxaliplatin, UGT1A1 for irinotecan. The response was measured by computed tomographic scan after completion of three cycles of chemotherapy. Overall response rate was significantly higher in planned group (67.9% vs. 46.3%, P = 0.020). In FOLFOX group, response rate was significantly improved in the planned patients(77.1% vs. 50%, P = 0.018). In FOLFIRI group, the difference didn't reach statistical significance (50% vs. 42.5%, P = 0.776). We found significantly improved response rates in the chemotherapy of metastatic colon cancer by pretreatment genetic analysis, especially in FOLFOX group. J. Surg. Oncol. © 2013 Wiley Periodicals, Inc.
    Journal of Surgical Oncology 12/2013; · 2.64 Impact Factor
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    ABSTRACT: BACKGROUND: Little is known of the oncological outcomes after adjuvant FOLFOX chemotherapy in patients with stage III colon cancer showing microsatellite instability high (MSI-H). In the present study we investigated the prognostic impact of MSI-H in patients with stage III colon cancer receiving FOLFOX chemotherapy. METHODS: We analyzed the MSI status in 127 patients with stage III colon cancer who underwent curative surgical resection followed by FOLFOX chemotherapy between January 2003 and December 2010. We assessed disease-free and overall survival (OS) in patients with MSI-H colon cancer compared with those showing microsatellite instability low or microsatellite stable (MSI-L/MSS) disease. RESULTS: Sixteen of the patients (12.6 %) were MSI-H, and 111 patients (87.4 %) were MSI-L/MSS. There was no significant difference between patients showing MSI-H and MSI-L/MSS except for age (P = 0.030), tumor location (P < 0.001), and differentiation (P = 0.031). Compared with MSI-L/MSS colon cancer, patients with MSI-H colon cancer had no significant difference in 5-year disease-free and OS (72.2 vs 68.5 %, P = 0.874; 68.1 vs 71.1 %, P = 0.437). CONCLUSIONS: Our study indicates that FOLFOX chemotherapy can be considered to treat stage III colon cancer patients with MSI-H after surgery, although the study was not randomized and included only a limited number of patients.
    World Journal of Surgery 06/2013; · 2.23 Impact Factor
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    ABSTRACT: The Korea Rare Isotope Accelerator, currently referred to as KoRIA, is briefly presented. The KoRIA facility is aimed to enable cutting-edge sciences in a wide range of fields. It consists of a 70 kW isotope separator on-line (ISOL) facility driven by a 70 MeV, 1 mA proton cyclotron and a 400 kW in-flight fragmentation (IFF) facility. The ISOL facility uses a superconducting (SC) linac for post-acceleration of rare isotopes up to about 18 MeV/u, while the SC linac of IFF facility is capable of accelerating uranium beams up to 200 MeV/u, 8 pμA and proton beams up to 600 MeV, 660 μA. Overall features of the KoRIA facility are presented with a focus on the accelerator design.
    Few-Body Systems 03/2013; 54(1-4):197. · 1.05 Impact Factor
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    ABSTRACT: The aim of this study was to investigate the clinical and radiological incidence of parastomal hernia and to analyze the risk factors for parastomal hernia. We reviewed retrospectively 108 patients with end colostomy from January 2003 to June 2010. Age, sex, surgical procedure type, body mass index (kg/m(2)), stoma size, and respiratory comorbidity were documented. There were 61 males (56.5%) and 47 females (43.5%). During an overall median follow-up of 25 months (range, 6 to 73 months), 36 patients (33.3%) developed a radiological parastomal hernia postoperatively and 29 patients (26.9%) presented with a clinical parastomal hernia. In multivariate analysis, gender (odds ratio [OR], 6.087; P = 0.008), age (OR, 1.109; P = 0.009) and aperture size (OR, 6.907; P < 0.001) proved to be significant and independent risk factors after logistic regression analysis. This study showed that the incidence of radiological parastomal hernia is higher than clinical parastomal hernia. Risk factors for parastomal hernia proved to be female, age, and aperture size.
    Journal of the Korean Surgical Society 01/2013; 84(1):43-7. · 0.21 Impact Factor
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    ABSTRACT: BACKGROUND: The role of neoadjuvant chemotherapy for resectable colorectal liver metastases is a subject of debate. We compared the oncologic outcomes between neoadjuvant chemotherapy and adjuvant chemotherapy combined with surgery for resectable synchronous colorectal liver metastases. METHODS: We analyzed 30 patients who underwent liver resection for resectable colorectal liver metastases combined with oxaliplatin-based neoadjuvant or adjuvant chemotherapy between May 2003 and August 2010. We assessed recurrence-free and overall survival in patients treated using neoadjuvant chemotherapy compared with those who received adjuvant chemotherapy. RESULTS: Of the 30 patients with colorectal liver metastases, 15 underwent neoadjuvant chemotherapy and 15 underwent adjuvant chemotherapy. Nine (60%) patients in the adjuvant group relapsed and nine (60%) patients in the neoadjuvant group relapsed. The neoadjuvant chemotherapy group had no significant difference in recurrence-free and overall 3-y survival (37.5% versus 45.0%, P = 0.938; 44.0% versus 66.7 %, P = 0.466) compared with the adjuvant chemotherapy group. CONCLUSION: Our results indicate that neoadjuvant chemotherapy is not inferior to adjuvant chemotherapy for resectable colorectal liver metastases, although the study was not randomized and included a limited number of patients.
    Journal of Surgical Research 11/2012; · 2.02 Impact Factor
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    ABSTRACT: The interesting electrochemical performances and magnetic properties of hierarchical NiO hollow microspheres were investigated. A rational formation mechanism of NiO hollow spheres from Ni(OH)2 was proposed on the basis of agglomerated-mediated growth.
    RSC Advances 10/2012; 2(26):9786-9790. · 3.71 Impact Factor
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    ABSTRACT: Antifibrotic effect of twelve diterpenes (1-12) from the 90% methanolic fraction of Biota orientalis leaves was evaluated employing HSC-T6 cells by assessing cell proliferation and morphological change. Among these diterpenes, totarol (8) and isopimara-8(14),15-dien-19-oic acid (9) dramatically reduced cell proliferation in dose-and time-dependent manner. Furthermore, treatment with these compounds resulted in the different pattern of morphological changes of HSC-T6 cells. Taken together, antiproliferative activity of diterpenes from B. orientalis might suggest therapeutic potentials against liver fibrosis.
    Archives of Pharmacal Research 08/2008; 31(7):866-71. · 1.54 Impact Factor
  • S.K. Yoo, Jun Choe, Do Yoon Kim
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    ABSTRACT: Internet-based health data exchange, which is particularly useful for the management of cooperative health care and life time health care records, requires the use of a common format to allow access to heterogeneous reservoirs scattered at different hospitals, as well as protection from intrusion and piracy. However, the unified management of multiple reservoirs is difficult to achieve, due to the different policies operated by different hospitals and the heterogeneous format of their information reservoirs. In this paper, we propose a multi-agent based secure architecture which can be used to retrieve healthcare information in a common format through the internet from multiple heterogeneous reservoirs. The proposed system is organized in the form of a 4-tier architecture, consisting of the client application, access control central agent, local access control agent and hospital information system, involving distributed processing with multiple matching agents connected to heterogeneous reservoirs and one flexible master controller to unify the different formats and different hospital policies, thus providing a secure common format and simplifying the problem of reservoir maintenance, including the addition, removal and modification of reservoirs. The combination of XML and RABC provides an efficient means of reservoir management, allowing for access control, a common format for information exchange, device independent display for diverse display resolutions of terminal devices, user identification for authentication, digital signature for data integrity, and selective encryption for protecting confidential health information.
    Computer and Information Science, 2008. ICIS 08. Seventh IEEE/ACIS International Conference on; 06/2008
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    ABSTRACT: Nodakenin is a coumarin compound initially isolated from the roots of Angelica gigas. In the present study, we investigated the effects of nodakenin on learning and memory impairments induced by scopolamine (1 mg/kg, i.p.) using the passive avoidance test, the Y-maze test, and the Morris water maze test in mice. Nodakenin (10 mg/kg, p.o.) administration significantly reversed scopolamine-induced cognitive impairments in the passive avoidance test and the Y-maze test (P<0.05), and also reduced escape latency during training in the Morris water maze test (P<0.05). Moreover, swimming times and distances within the target zone of the Morris water maze were greater in the nodakenin-treated group than in the scopolamine-treated group (P<0.05). In an in vitro study, nodakenin was found to inhibit acetylcholinesterase activity in a dose-dependent manner (IC(50)=84.7 microM). In addition, nodakenin was also found to inhibit acetylcholinesterase activity for 6 h in an ex-vivo study. These results suggest that nodakenin may be a useful for the treatment of cognitive impairment, and that its beneficial effects are mediated, in part, via the enhancement of cholinergic signaling.
    Life Sciences 06/2007; 80(21):1944-50. · 2.56 Impact Factor
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    ABSTRACT: Combination chemotherapy using oxaliplatin, 5-fluorouracil and folinic acid (FOLFOX) is known to be effective in the treatment of metastatic colon cancer. Genes regulating the actions of 5-fluorouracil and oxaliplatin have been identified, but precisely which gene is dominant has not yet been determined. The aim of the investigation reported here was to identify which gene polymorphism is a dominant factor in FOLFOX chemotherapy-the methylenetetrahydrofolate reductase (MTHFR) gene for 5-fluorouracil or the X-ray cross-complementing1 (XRCC1) gene for oxaliplatin. Paraffin-embedded tissues from 54 patients with unresectable metastases from colorectal cancer who had undergone chemotherapy with the FOLFOX regimen were analyzed for MTHFR polymorphisms in the MTHFR gene (677C-->T, Ala-->Val mutation) and XRCC1 gene (Arg-->Gln substitution in exon 10). Response rates and survivals were compared by types of polymorphism. Analyses of the patterns of MTHFR polymorphism revealed that 29.6% of the patients showed no mutation, 51.6% showed heterozygous mutations, and 11.8% showed homozygous mutations. Analyses of the XRCC1 polymorphism revealed that 60.8% of the patients showed no mutation, 31.4% showed heterozygous mutations, and 7.8% showed homozygous mutations. After four cycles of chemotherapy, 3.7% showed a complete response, 57.4% showed a partial response (PD) or stable disease, and 38.9% showed PD. The MTHFR polymorphism was not significant in predicting response and 30-month-survival (P > .1), whereas the XRCC1 polymorphism was a significant prognostic factor for both response (P = .038) and survival (P = .011). We found a higher rate of mutations in the MTHFR gene than in the XRCC1 gene in Korean colorectal cancer patients. Response to FOLFOX was better in the patient group with mutations for MTHFR and worse in the patient group with mutations for XRCC1. However, only the XRCC1 polymorphism was a significant prognostic factor for the response to FOLFOX chemotherapy and short-term survival.
    Annals of Surgical Oncology 11/2006; 13(11):1379-85. · 4.12 Impact Factor
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    ABSTRACT: Although the structure has been elucidated for the binding of colchicine and podophyllotoxin as potent destabilizer for microtubule formation, very little is known about MDL-27048, a competitive inhibitor for colchicine and podophyllotoxin. The structural basis for the interaction of antimitotic agents with tubulin was investigated by molecular modeling, and we propose binding models for MDL-27048 against tubulin. The proposed model was not only consistent with previous competition experiment data between colchicine and MDL-27048, but further suggested an additional binding cavity on tubulin. Based on this finding from the proposed MDL-tubulin complex, we performed molecular design studies to identify new antimitotic agents. These new chalcone derivatives exerted growth inhibitory effects on all four human hepatoma and one renal epithelial cell lines tested and induced strong cell cycle arrest at G2/M phase. Furthermore, these compounds exhibited a strong inhibitory effect on tubulin polymerization in vitro. Therefore, we suggest that the validated MDL-27048 model would serve as a potent platform for designing new molecular entities for anticancer agents targeted to microtubules.
    Journal of Medicinal Chemistry 10/2006; 49(19):5664-70. · 5.61 Impact Factor

Publication Stats

91 Citations
48.59 Total Impact Points

Institutions

  • 2014
    • Gachon University
      • College of BioNano Technology
      Sŏngnam, Gyeonggi Province, South Korea
  • 2012–2014
    • Ajou University
      • Department of Surgery
      Sŏul, Seoul, South Korea
    • Sogang University
      • Department of Chemistry
      Sŏul, Seoul, South Korea
  • 2013
    • Sungkyunkwan University
      Sŏul, Seoul, South Korea
  • 2006–2008
    • Yonsei University
      • • Department of Medical Engineering
      • • Department of Biotechnology
      Seoul, Seoul, South Korea
  • 2007
    • Seoul National University
      • College of Pharmacy
      Sŏul, Seoul, South Korea