H. Jung

University of Seoul, Sŏul, Seoul, South Korea

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Publications (115)313.73 Total impact

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  • M Park, H Jung, G Kim, Y Ji, K Kim, S Park
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    ABSTRACT: Purpose: To estimate the three dimensional dose distributions in a polymer gel and a radiochromic gel by comparing with the virtual water phantom exposed to proton beams by applying Monte Carlo simulation.
    Medical Physics 06/2014; 41(6):279-279. DOI:10.1118/1.4888574 · 3.01 Impact Factor
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    ABSTRACT: Purpose: In this study, the dose responses of the MAGIC gel with various concentrations and type of saccharide are examined to clarify the roles of mono and disaccharide in the polymerization process. Then we focused on the tissue equivalence and dose sensitivity of MAGIC gel dosimeters.
    Medical Physics 06/2014; 41(6):252-252. DOI:10.1118/1.4888460 · 3.01 Impact Factor
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    ABSTRACT: Purpose: The objective of this study is to evaluate radiation sensitivity of optical stimulated luminance dosimeters (OSLDs) by accumulated dose and high dose.
    Medical Physics 06/2014; 41(6):296-296. DOI:10.1118/1.4888648 · 3.01 Impact Factor
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    ABSTRACT: Adaptive hypermedia has been developed to overcome the prob-lems of disorientation by providing personalized presentation and link struc-ture. An adaptive hypermedia system consists of an adaptation model, a domain model, and a user model. The user model describes various aspects of a user such as interests, knowledge, preferences, etc. The domain model describes the whole knowledge accessible in adaptive hypermedia. The adap-tation model consists of adaptation rules that define both how to generate the personalized presentation and update the user model [12]. Authoring adaptive hypermedia typically starts by designing a domain model so that apprropiate adaptation model and user model can be created based the domain model. While there are authoring tools developed for creating domain model of an adaptive hypermedia, authors need to manually create basic concepts as well as their relationships for a domain of interests. In this paper, we present a system that transforms an ontology into the domain and adaptation model of adaptive hypermedia so that the authors can generate adaptive hypermedia easily. The system transforms classes and relationships between the classes de-fined in OWL ontology [7] into concepts and relationships between the concepts defined in the domain model of AHA! system which is one of best known open source general-purpose adaptive hypermedia systems [1]. Using our system, authors can utilize well-defined knowledge structure in ontologies for author-ing adaptive hypermedia. On top of this, since designing domain model is generally an initial step to author adaptive hypermedia, our system can help authors reduce tasks to create adaptive hypermedia by automatically generat-ing domain model from an ontology.
    03/2014; 7(2). DOI:10.15837/ijccc.2012.2.1410
  • International Journal of Radiation OncologyBiologyPhysics 10/2013; 87(2):S754. DOI:10.1016/j.ijrobp.2013.06.1997 · 4.18 Impact Factor
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    ABSTRACT: Purpose: We aimed to evaluate optical stimulated luminance dosimeters (OSLD) to estimate high dose in 60Co unit and to compare to advanced study about OSLDMethods: OSLDs were grouped into three groups by radiation sensitivity (serial No.) and each groups consisted of dosimeters with variation of radiation sensitivity within ± 1.5% among them by sampling. When we evaluated dosimetric characteristics of OSLD, indicated used OSLD groups in list of evaluation of the dosimetric characteristics of them. OSLD had supra‐linear response from more than 3 Gy. So the correlation of between dose delivered from 60Co and count was fitted by quadratic function. We compared to calculation dose and delivery dose in more than 3 GyResults: The reproducibility was 0.76% of the coefficient of variation, the batch homogeneity was within 1.5 % of the coefficient of variation and the depletion by repeat reading was 0.04% per reading. The half time of count decay curve after irradiation according to reading time was 0.68 min. (1 Gy), 1.04 min. (5 Gy), and 1.10 min. (10 Gy), respectively and the count decay was stable after 11 min, After stability, coefficient of variation was within 0.4%.The removal rate of count by optical annealing time (30min.) after OSLD reading was 88% (1 Gy), 90% (5 Gy), and 92% (10 Gy), respectively and was 99% when they were annealed for 4hour. The diff. % of between delivery dose form 60Co unit and calculated dose from fitting model was within ± 4.0%. But the OSLDs irradiated dose above 20 Gy changed their radiation sensitivity. So it is necessary to use carefully them and to calibrate radiation sensitivity of themConclusion: Considering to uncertainty of count for procedure, if delivery dose was calculated, it is feasible to use OSLD for evaluation of high dose in 60Co unit. Acknowledgement:This research was supported by the Ministry of education, Science and Technology(MEST)
    Medical Physics 06/2013; 40(6):211. DOI:10.1118/1.4814473 · 3.01 Impact Factor
  • S Kwon, Y Cho, K Kim, H Jung, Y Ji
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    ABSTRACT: Purpose: To improve the dose sensitivity and tissue equivalence of MAGIC gel dosimeter, the effect of sucrose as an additive is investigated. Methods: For the synthesis of the gel, sucrose was placed in high‐purity distilled water (HPLC) and dissolved at room temperature, this was followed by the addition of gelatine. Then, hydroquinone was added and the gel cooled to 40 degree. Lastly, methacrylic acid, ascorbic acid and copper (II) sulfate were added. A Biobeam 8000 (STS, Braunschweig, Germany) Cesium‐137 Gamma‐ray irradiator was used with a dose rate of 2.6 Gy/m. Magnetic resonance images of the gel were acquired by using a 3.0 T MRI. Results: Gels synthesized by adding sucrose to the MAGIC gel displayed increases in carbon content and decreases in oxygen content as the concentration of sucrose increased. When 20% sucrose was added to MAGIC Gel, it was possible to obtain an O/C ratio that matched that of soft tissue within a 5% range. This confirms that the low carbon content in the MAGIC gel could be improved by adding sucrose. Sucrose, as a substance that accelerates the polymerization of monomers, maintains linearity for a wide range of doses. It was possible to obtain a dose sensitivity that is approximately 3.45 times higher in a MAGIC gel dosimeter with a sucrose concentration of 30% compared to one with 0%. It was also possible to confirm that the slope‐to‐intercept ratio increased as the concentration of sucrose increased. Conclusion: Improved MAGIC gel concentrations have higher sensitivity and better elemental tissue equivalency for 3‐dimensional dosimetry in radiotherapy field. This work was supported by National Foundation of Korea Grant funded by the Korean Government(2011‐0030597)
    Medical Physics 06/2013; 40(6):230. DOI:10.1118/1.4814549 · 3.01 Impact Factor
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    ABSTRACT: Purpose: We developed Graphic User Interface (GUI) to evaluate and verify whether Dose Volume Histogram (DVH) parameters meet clinical protocol criteria. Methods: A graphical application to import and evaluate DVH parameters was developed by using Matlab (version R2012a, Mathworks). Two DVH text files which were exported from Eclipse treatment planning system (Varian, USA) could be imported, and it automatically depicts DVH values and arranges dose statistics in Eclipse manner (Figure 1). Additionally, it is possible to evaluate not only KIRAMS dose constraint protocol but also currently well‐known normal tissue constraint protocol such as American Association of Physicists in Medicine (AAPM), Radiation Therapy Oncology Group (RTOG) and Quantitative Analyses of Normal Tissue Effects in the Clinic (QUANTEC). Those protocols were able to be simultaneously depicted on the DVH so that dose constraints were easily distinguishable. Results: DVH data analyzed for all organ parameters with the application was faster than manually looking for points using the treatment planning system. Also, since a protocol‐specific marker used for evaluating dose constraint, the software was easily able to verify each depicted DVH for different types of patient plans whether under the protocol suggested dose or not (Figure 2). Conclusion: This software can help the planner to easily decide how much computer‐calculated DVH was over/under estimated on the basis of the dose constraints that clinical protocols suggested. Acknowledgement : This research was supported by the Ministry of education, Science and Technology(MEST)
    Medical Physics 06/2013; 40(6):369. DOI:10.1118/1.4815138 · 3.01 Impact Factor
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    ABSTRACT: Purpose: The output of General X‐ray unit (low energy) has variation against 60Co unit. So it is necessary to minimize output variation when evaluating dosimetric characteristics of optical stimulated luminance dosimeters (OSLDs). Considering output variation of X‐ray unit, we evaluated dosimetric characteristics of OSLDs in low energyMethods: The OSLDs that used were nanoDotTM Dosimeter (Landauer Inc, Glenwood, USA) and this dosimeter had never been irradiated. Through single irradiate them (test dose was 7mGy), we certified batch homogeneity and sampled dosimeters with variation of radiation sensitivity within ± 1.5% among them. Using to these dosimeters certified reproducibility considering output variation every time when irradiated OSLDs. Through this process, we certified element correction factor (ECF) and coefficient of variation (COV) about each OSLD. Based on these OSLDs, we studied linearity, energy dependence and angular dependenceResults: The batch homogeneity was 1.21% of the coefficient of variation (after sampling). The average value of COV about reproducibility of OSLDs was reduced from 1.3% to 0.96% after applying to output correction factor. The linearity was that the correlation of between dose and count was fitted by linear function (R2 =0.997). The energy dependence study showed a range of ion chamber‐to OSLD rations from 0.23 (24.7 keV) to 0.27 (34.5 keV). According to energy, the range of angular dependence was from 0.1% to 8.4% variation when each degree was normalized by zero degreeConclusion: Considering output correction factor, reduced uncertainty occurred in general x‐ray unit. We acquired information that was ECF, COV of OSLDs in low energy. Using to these OLDs, It is feasible to measure patient dose of diagnostic radiography and Cone beam computed tomography for radiotherapy
    Medical Physics 06/2013; 40(6):210. DOI:10.1118/1.4814465 · 3.01 Impact Factor
  • European Urology Supplements 03/2013; 12(1):e974. DOI:10.1016/S1569-9056(13)61452-9 · 3.37 Impact Factor
  • Medical Physics 01/2013; 40(6):229. DOI:10.1118/1.4814546 · 3.01 Impact Factor
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    ABSTRACT: Giant Magellan Telescope possesses two secondary mirror systems - Fast Steering Mirror (FSM) and Adaptive Secondary Mirror (ASM). FSM would compensate wind effect and structure jitter by using a tip-tilt mechanism. FSM is 3.2 m in diameter and has a fast focal ratio of 0.65. FSM consists of seven segments each of which is 1.1 m in diameter. An FSM prototype (FSMP) has been developed, which consists of a full-size off-axis mirror segment and a tip-tilt test-bed. By developing the FSMP, the key technologies- fabrication of highly aspheric off-axis mirror and tip-tilt actuation - would be achieved. The backside of the mirror was completed by spherical surface with light-weighting and etching. The grinding of the front surface was finished, and polishing is in progress. The tip-tilt test-bed has also been manufactured and assembled. Frequency tests are being performed with fine tuning of the assembly. For the development of the FSMP, Korea Astronomy and Space Science Institute is working together with other institutions in Korea and USA. In this paper, we present progress of the prototype development, and future works.
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    ABSTRACT: BACKGROUND: The aim of this study was to evaluate the efficacy and safety of acupuncture in the treatment for allergic rhinitis. METHODS: This study was a multicenter, randomized, parallel-controlled study. Participants were randomized to either the active acupuncture, sham acupuncture, or waitlist groups. The active and sham acupuncture groups received acupuncture treatment three times per week for 4 weeks. In the sham group, minimal acupuncture at nonacupuncture points was used. The waitlist group did not receive any acupuncture treatment. RESULTS: Of the 238 participants, 97, 94, and 47 individuals were assigned to the active acupuncture, sham acupuncture, and waitlist group, respectively. After the treatment, the difference in the total nasal symptom score (TNSS) was significantly reduced in the active acupuncture group compared with the sham acupuncture (difference: -1.03, 95% confidence interval [CI]: -1.96, -0.09, P = 0.03) and waitlist (difference: -2.49, 95% CI: -3.68, -1.29, P < 0.0001). The active acupuncture group exhibited a significant change in the total non-nasal symptom score (TNNSS) compared with the waitlist (difference: -0.78, 95% CI: -1.22, -0.34, P = 0.0002), but not the sham acupuncture group (difference; 0.15, 95% CI: -0.21, 0.5, P = 0.56). Both active and sham acupuncture treatments resulted in significant improvements in TNSS and TNNSS compared to baseline. CONCLUSION: Active acupuncture showed a significantly greater effect on symptoms of allergic rhinitis than either sham acupuncture or no active treatment. The symptoms of allergic rhinitis decreased significantly after treatment in the both acupuncture and sham acupuncture groups. Acupuncture appears to be an effective and safe treatment for allergic rhinitis.
    Allergy 12/2012; 68(3). DOI:10.1111/all.12053 · 6.00 Impact Factor
  • International Journal of Radiation OncologyBiologyPhysics 11/2012; 84(3):S865. DOI:10.1016/j.ijrobp.2012.07.2314 · 4.18 Impact Factor
  • European Urology Supplements 11/2012; 11(5):206. DOI:10.1016/S1569-9056(13)60424-8 · 3.37 Impact Factor
  • S Park, K Kim, H Jung, M Kim, Y Ji
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    ABSTRACT: Purpose: In this study, we performed the experiment of correlation between internal organ movement and external abdominal surface movement for the mini pig using the developed motion tracking system. Methods: The experimental system was consisted with imaging acquisition part and image signal analyzing part. The image acquisition of internal organ was performed with a C-arm fluoroscopy system, and abdominal surface images were acquired with a camera and image acquisition board. The signal processing of the image was conducted using LabVIEW 8.6. The developed system was applied to a mini pig. The information of the internal organ movement was acquired with C-arm fluoroscopy system by tracking the fiducial gold maker pre-implemented into diaphragm, which was used in Cyberknife radiation therapy. The data acquisition of internal organ movement due to respiration and abdominal surface movement was performed under general anesthesia. Results: The motions of the internal and external markers were well correlated. The correlation coefficients between the AP movement of the external marker and the SI and RL movement of the internal target in the experiment using the mini pig were resulted in 0.903 and 0.905, respectively. Conclusions: It is confirmed that high correlations between the movements of external marker and the targetassigned in diaphragm in the experimental case for the mini pig were existed. Therefore, it is possible to predict the locations of internal target from the movement of the external marker. These results show the possibility to use the DTTRT (Dynamic Tumor Tracking Radiation Therapy) system of Korea Institute of Radiological and Medical Science (KIRAMS) to clinical application of animals.
    Medical Physics 06/2012; 39(6):3690. DOI:10.1118/1.4735000 · 3.01 Impact Factor

Publication Stats

210 Citations
313.73 Total Impact Points

Institutions

  • 2014
    • University of Seoul
      Sŏul, Seoul, South Korea
  • 2012
    • Korea Institute of Radiological & Medical Sciences
      Sŏul, Seoul, South Korea
    • Korea Institute of Oriental Medicine
      Bucheon, Gyeonggi-do, South Korea
  • 2010–2011
    • Sungkyunkwan University
      Sŏul, Seoul, South Korea
    • Seoul Veterans Hospital
      Sŏul, Seoul, South Korea
  • 2008–2011
    • Seoul National University Hospital
      • Department of Obstetrics and Gynecology
      Sŏul, Seoul, South Korea
    • Gachon University
      Sŏngnam, Gyeonggi-do, South Korea
    • Gwangju Institute of Science and Technology
      • School of Environmental Science and Engineering
      Gwangju, Gwangju, South Korea
  • 2003–2011
    • Yonsei University
      • • Department of Biotechnology
      • • Department of Physics
      • • Department of Medicine (Wonju College of Medicine)
      Sŏul, Seoul, South Korea
    • Korea Food and Drug Administration
      Seishō-gun, Gyeongsangbuk-do, South Korea
  • 2009–2010
    • Seoul National University Bundang Hospital
      • Department of Obstetrics and gynecology
      Sŏul, Seoul, South Korea
    • Yeungnam University
      • Department of Urology
      Daikyū, Daegu, South Korea
    • Hanseo University
      Kōjō, South Chungcheong, South Korea
    • Korea University
      • Department of Chemical and Biological Engineering
      Sŏul, Seoul, South Korea
  • 2002–2009
    • Seoul National University
      • • Department of Obstetrics and Gynecology
      • • Department of Biological Sciences
      Sŏul, Seoul, South Korea
  • 2004–2006
    • Inje University
      • PharmacoGenomics Research Center
      Kŭmhae, Gyeongsangnam-do, South Korea