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趙俊翼 군산대학교 1985 群山水産專門大學 硏究報告 Vol.19 No.3
Recently we have been applied to the programmable control that used a microprocessor. The induction motor speed control should be achieved by the 8 bit microprocessor. The implementation of 3Ø inverter control strategy using a microprocessor is discussed in this paper, in which a microprocessor is used to control the output waveform as well as the frequency and voltage. Control scheme and practical implementation using a SRC-80A microprocessor are described. The pulse generating software using a microprocessor SRC-80A are implemented here. Experimental results using a resistive load instead of inductive load are given.
趙俊翼 군산대학교 1983 群山水産專門大學 硏究報告 Vol.17 No.3
The operation of phase-locked loop(PLL) systems is described in the paper. By PLL method on to a reference frequency, speed accuracies of 0.002 percent are possible. A complete speed control system employing a 3-HP motor has been designed and tested in the laboratory and the system gives satisfactory performance. The principle can be extended to three-phase system with higher horse-power drives, or to other phase-controlled converter circuits.
趙俊翼 군산대학교 1983 群山水産專門大學 硏究報告 Vol.17 No.1
The typical Dc chopper motor controller consists of two thyristors, two or three diode rectifiers, a commutating capacitor, and one or more commutation inductances. The major art in circuit design is selection the most suitable configuration for the given application, particularly the location of the inductances. It is desirable to minimize the inductance in certain loops and to carefully choose the inductance in other loops. Optimization technique has been applied to attractive chopper circuit. It appears that inductance in series with the auxiliary thyristor favors turn-off of the main thyristor at the expense of the auxiliary thyristor. The best arrangement has most of the commutating inductance in the path that is common to both tayristors. When one of the thyristors has a diode connected directly across it, there is generally an optimum value of inductance which yields maximum turn-off time.
趙俊翼 군산대학교 1984 群山水産專門大學 硏究報告 Vol.18 No.3
Recently we have been studied on the programmable control that used a microprocessor. The motor speed control should be achieved by the microprocessor in a vessel bridge. In this paper, a motor drive circuit is designed for the microprocessor control and pictured the programmable Ac waveforms to profit speed control for the thyristr turn-on. The shifted waveforms insulated by the pulse transformer for the thyristor turn-on. Output wave-forms had a little distortion by any surge voltage shown in Fig. 10 and Fig.11.
Cho, Ick Joon,Chung, Woong-Ki,Lee, Joon Kyoo,Lee, Min-Cheol,Paek, Jayeong,Kim, Yong-Hyub,Jeong, Jae-Uk,Yoon, Mee Sun,Song, Ju-Young,Nam, Taek-Keun,Ahn, Sung-Ja,Lee, Dong Hoon,Yoon, Tae Mi,Lim, Sang-Ch The Korean Society for Radiation Oncology 2019 Radiation Oncology Journal Vol.37 No.4
Purpose: To investigate the differences in treatment outcomes between two radiation techniques, intensity-modulated radiotherapy (IMRT) and three-dimensional conformal radiotherapy (3DCRT). Materials and Methods: We retrospectively analyzed 160 (IMRT = 23, 3DCRT = 137) patients with stage I glottic cancer treated from January 2005 through December 2016. The IMRT was performed with TomoTherapy (16 patients), volumetric-modulated arc therapy (6 patients), and step-and-shoot technique (1 patient), respectively. The 3DCRT was performed with bilateral parallel opposing fields. The median follow-up duration was 30 months (range, 31 to 42 months) in the IMRT group and 65 months (range, 20 to 143 months) in the 3DCRT group. Results: The 5-year overall survival and 3-year local control rates of the 160 patients were 95.7% and 91.4%, respectively. There was no significant difference in 3-year local control rates between the IMRT and 3DCRT groups (94.4% vs. 91.0%; p = 0.587). Thirteen of 137 patients in the 3DCRT group had recurrences. In the IMRT group, one patient had a recurrence at the true vocal cord. Patients treated with IMRT had less grade 2 skin reaction than the 3DCRT group, but this had no statistical significance (4.3% vs. 21.2%; p = 0.080). Conclusion: IMRT had comparable outcomes with 3DCRT, and a trend of less acute skin reaction in stage I glottic cancer patients.
Ick Joon Cho,Jae-Uk Jeong,Taek-Keun Nam,Young-Eun Joo,Sung-Bum Cho,Yong-Hyub Kim,Ju-Young Song,Mee Sun Yoon,Sung-Ja Ahn,Woong-Ki Chung 대한방사선종양학회 2022 Radiation Oncology Journal Vol.40 No.1
Purpose: This study aimed to determine the correlation between protein induced by vitamin K absence or antagonist-II (PIVKA-II) and stereotactic body radiotherapy (SBRT) in patients with hepatocellular carcinoma (HCC). Materials and Methods: Sixty-one patients received SBRT between 2015 and 2020 with a median dose of 48 Gy (range, 39 to 60 Gy) with a median of 4 fractions. Changes in tumor markers before and after SBRT were analyzed. Results: The median follow-up period was 31 months (range, 12 to 64 months). The estimated 2-year in-field failure-free survival, progression-free survival (PFS), and overall survival rates were 82.0%, 39.3%, and 96.7%, respectively. Patients with decreased PIVKA-II levels through SBRT had significantly few in-field failures (p = 0.005). Patients with PIVKA-II levels of ≤25 mAU/mL after SBRT had significantly long PFS (p = 0.004). Conclusion: PIVKA-II could be a useful surrogate marker for response or survival outcomes in patients with localized HCC receiving SBRT.
Bias-Stress-Induced Instabilities in P-Type <tex> ${\rm Cu}_{2}{\rm O}$</tex> Thin-Film Transistors
Ick-Joon Park,Chan-Yong Jeong,Myeonghun, U.,Sang-Hun Song,In-Tak Cho,Jong-Ho Lee,Eou-Sik Cho,Hyuck-In Kwon IEEE 2013 IEEE electron device letters Vol.34 No.5
<P>We investigate the gate bias-stress-induced instabilities of p-type copper oxide (Cu<SUB>2</SUB>O) thin-film transistors (TFTs). Transfer curves measured before and after the application of constant gate bias stress under air and vacuum environments show that the partial pressure of the oxygen in the environment does not much affect the transfer characteristics and bias-stress-induced instabilities of the Cu<SUB>2</SUB>O TFTs. During the negative gate bias stresses, the transfer curves shift to the negative direction without a significant variation of the shape, which is attributed to the hole trapping in the interface or bulk dielectric layers with a negligible creation of additional interface trap states. During the positive gate bias stresses, a threshold voltage hardly moves to the positive direction because of the lack of free electron inside the p-type Cu<SUB>2</SUB>O, but a notable degradation of the subthreshold slope is observed. From the recovery characteristics, the generated traps during the positive gate bias stress are estimated to be metastable ones in p-type Cu<SUB>2</SUB>O TFTs.</P>
Ick Joon Cho,Woong-Ki Chung,Joon Kyoo Lee,Min-Cheol Lee,Jayeong Paek,Yong-Hyub Kim,Jae-Uk Jeong,Mee Sun Yoon,Ju-Young Song,Taek-Keun Nam,Sung-Ja Ahn,Dong Hoon Lee,Tae Mi Yoon,Sang-Chul Lim 대한방사선종양학회 2019 Radiation Oncology Journal Vol.37 No.4
Purpose: To investigate the differences in treatment outcomes between two radiation techniques, intensity-modulated radiotherapy (IMRT) and three-dimensional conformal radiotherapy (3DCRT). Materials and Methods: We retrospectively analyzed 160 (IMRT = 23, 3DCRT = 137) patients with stage I glottic cancer treated from January 2005 through December 2016. The IMRT was performed with TomoTherapy (16 patients), volumetric-modulated arc therapy (6 patients), and step-and-shoot technique (1 patient), respectively. The 3DCRT was performed with bilateral parallel opposing fields. The median follow-up duration was 30 months (range, 31 to 42 months) in the IMRT group and 65 months (range, 20 to 143 months) in the 3DCRT group. Results: The 5-year overall survival and 3-year local control rates of the 160 patients were 95.7% and 91.4%, respectively. There was no significant difference in 3-year local control rates between the IMRT and 3DCRT groups (94.4% vs. 91.0%; p = 0.587). Thirteen of 137 patients in the 3DCRT group had recurrences. In the IMRT group, one patient had a recurrence at the true vocal cord. Patients treated with IMRT had less grade 2 skin reaction than the 3DCRT group, but this had no statistical significance (4.3% vs. 21.2%; p = 0.080). Conclusion: IMRT had comparable outcomes with 3DCRT, and a trend of less acute skin reaction in stage I glottic cancer patients
Cho, Ick-Hyun,Lü,, Zhi-Rong,Yu, Jae-Ran,Park, Yong-Doo,Yang, Jun-Mo,Hahn, Myong-Joon,Zou, Fei Adenine Press 2009 Journal of biomolecular structure & dynamics Vol.27 No.3
<P>The overexpression of a single tyrosinase gene can induce conspicuous pigmentation in nonpigmented cells. We hypothesized that some unknown tyrosinase-associated genes are simultaneously regulated by melanin synthesis. To improve understanding of melanogenesis and tyrosinase-associated functions, we attempted to profile the genes that are altered during melanin production in HEK293 cells by using a functional DNA chip microarray. The candidate genes were obtained based on significance analysis of microarray (SAM) and further computational prediction via protein-protein interaction (PPI) mapping suggested that newly detected hub genes were involved in melanogenesis. PPI mapping using bioinformatic tools revealed 8 genes that formed an interaction hub. The yeast two-hybridization results suggested some candidate genes could interact with tyrosinase. The present study provides information to further understand the complex factors associated with tyrosinase-induced melanogenesis and apoptosis. The approach of combining expression data analysis and predicted protein interaction partners can help identify genes involved in pigmentation.</P>
Cho Shinhaeng,Cho Ick Joon,Kim Yong Hyub,Jeong Jae-Uk,Yoon Mee Sun,Ahn Sung-Ja,Nam Taek-Keun,Song Ju-Young 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.5
The internal target volume (ITV)-based IMRT method can be used to reduce the effect of respiratory tumor motion. In this study, the effect of tumor motion on the dosimetric accuracy during ITV-based IMRT was investigated. ITV-based IMRT plans for a total of ten cases of liver cancer were prepared in TomoTherapy (Tomo) and volumetric modulated arc therapy (VMAT). Delivery quality assurance (DQA) plans were created using Delta4 phantom for the verification of dosimetric accuracy of the established Tomo and VMAT plans. DQA measurements were performed in both the static mode and the Hexa-Motion mode by using the Delta4 Hexa-Motion system in Tomo and VMAT. In the static mode, the average gamma passing rate (GPR) using a 3% dose difference/3 mm distance-to-agreement criteria was 99.61% in Tomo and 99.35% in VMAT, which confirmed sufficient dosimetric accuracy in both IMRT methods. For the Hexa-Motion measurement, the average GRP result of 90.93% in Tomo was higher than the result of 82.58% obtained in VMAT. In addition, the difference in the GPR results between the static and the Hexa-motion modes in Tomo was 8.68%, which is approximately 8% less than the 16.77% difference in VMAT. This study verifies that the dosimetric error of ITV-based IMRT due to the tumor motion was larger in VMAT than in Tomo. Also, Tomo can be considered to be more suitable than the conventional LINAC-based VMAT method in terms of the dosimetric accuracy of ITV-based IMRT for the treatment of a moving tumor.