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        • SCOPUSKCI등재

          탄소섬유/에폭시 복합재료의 층간파괴인성에 미치는 균열진전각도의 영향

          황진호,운봉,Hwang, Jin-Ho,Hwang, Woon-Bong 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6

          Interlaminar fracture toughness of carbon/epoxy composite materials has been studied under tensile and flexural loading by the use of width tapered double cantilever beam(WTDCB) and end notched flexure(ENF) specimens. This study has significantly examined the effect of various interfacial ply orientation, ${\alpha}(0^{\circ},\;45^{\circ}\;and\;90^{\circ})$ and crack propagation direction, ${\theta}(0^{\circ},\;15^{\circ},\;30^{\circ}\;and\;45^{\circ})$ in terms of critical strain energy release rate through experiments. Twelve differently layered laminates were investigated. The data reduction for evaluating the fracture energy is based on compliance method and beam theory. Beam theory is used to analyze the effect of crack propagation direction. The geometry and lay-up sequence of specimens are considered various conditions such as skewness parameter, beam volume, and so on. The results show that the fiber bridging occurred due to the non-midplane crack propagation and causes the difference of fracture energy evaluated by both methods. For safer and more reliable composite structures, we obtain the optimal stacking sequence from initial fracture energy in each mode.

        • KCI등재

          증착 속도에 따른 펜타센 박막 트랜지스터의 성능 연구

          황진호,김두리,김민우,이한주,알센바바쟈얀,Levon ODABASHYAN,Zhirayr BAGHDASARYAN,이기진,차덕준 한국물리학회 2018 New Physics: Sae Mulli Vol.68 No.11

          We studied the electrical properties of organic thin-film transistors (OTFTs) fabricated at different deposition rates by measuring the field-effect mobility and the threshold voltages. As the active layer, pentacene thin film with a thickness of 50 nm was deposited at a rate of 0.05 Å/s to 1.14 Å/s. The thickness of the drain-source gold electrode was 50 nm. The mobility was 1.9 $\times$ 10$^{-1}$ cm$^2$/V$\cdot$s at a deposition rate of 0.05 Å/s, the mobility increased to 5.2 $\times$ 10$^{-1}$ cm$^2$/V$\cdot$s when the deposition rate was increased to 0.4 Å/s, and then the mobility decreased to 6.5 $\times$ 10$^{-2}$ cm$^2$/V$\cdot$s when the deposition rate decreased to 1.14 Å/s. Thus, the mobility of pentacene OTFTs was observed to depend on the thermal deposition rate. 본 연구는 각각 다른 증착 속도로 제작된 유기 박막 트랜지스터(organic thin film transistor, OTFT)의 전하 이동도와 문턱 전압을 측정하여 전기적 성질을 분석했다. OTFT의 활성층으로, 펜타센 (pentacene)을 0.05 Å/s $\sim$ 1.14 Å/s의 증착 속도에 따라 50 nm의 두께로 진공 열 증착했다. 드레인-소스 전극은 금 (Au)을 50 nm의 두께로 증착했다. 펜타센 증착 속도가 0.05 Å/s일 때 전하 이동도는 1.9 $\times$ 10$^{-1}$ cm$^2$/V$\cdot$s 였고, 증착 속도가 0.4 Å/s로 증가함에 따라 전하 이동도는 5.2 $\times$ 10$^{-1}$ cm$^2$/V$\cdot$s 로 증가했으며, 증착 속도가 1.14 Å/s로 증가함에 따라 전하 이동도는 6.5 $\times$ 10$^{-2}$ cm$^2$/V$\cdot$s 로 감소했다. 따라서, 펜타센 기반의 OTFT의 전하 이동도는 열 증착 속도에 의존함을 관측하였다.

        • KCI등재

          국내 온열 암 치료 시스템의 품질관리 프로토콜 확립에 대한 연구

          황진호,계철승 한국콘텐츠학회 2020 한국콘텐츠학회논문지 Vol.20 No.1

          Quality Assurance (QA) is essential to provide effective hyperthermia, but in the case of a problem with a hyperthermia cancer therapy system in Korea, the manufacturers or venders are repairing and maintaining the system. In Korea, if an error occurs in the hyperthermia system, the manufacturer and sales agent are repairing and maintaining it. There is no QA protocol suitable for the domestic situation. This study is based on the QA guidelines recommended by institutions such as European Society for Hyperthermia Oncology (ESHO), Hellenic Society of Oncologic Hyperthermia (HSOH), and the results of questionnaires to hospitals that have hyperthermia cancer therapy systems in Korea. By developing an optimized QA protocol, we aim to reduce the errors and inaccuracies that can occur in during hyperthermia such as measurement of temperature, instrumentation, and heat transfer. In addition, we will visit a hospital with a hyperthermia cancer therapy system in Korea to perform a QA based on this study, and study to specify tolerances and accurate QA set-up parameters using the measured QA results. 효과적인 온열치료를 제공하기 위해선 품질관리는 필수적이지만, 하지만, 국내의 경우 온열 치료 시스템에 이상이 발생할 경우 제조사 및 판매대행사에서 수리 및 유지 보수를 해주고 있어, 국내 실정에 맞는 QA 프로토콜이 존재하지 않는다. 본 연구에서는 European Society for Hyperthermia Oncology (ESHO), Hellenic Society of Oncologic Hyperthermia (HSOH) 등의 기관에서 권고하는 QA 가이드라인과 국내에서 온열 치료 시스템을 보유하고 있는 기관에 설문지를 배포한 결과를 기반으로 국내에 도입된 온열 치료 시스템에 최적화된 품질관리 프로토콜을 개발함으로써 온열 치료의 온도 계측, 장비구동, 온도 전달 등에서 발생할 수 있는 오차와 부정확성을 감소시키고자 하며, 이로 인해 암 치료율을 증가시키고 부작용과 재발률을 감소시켜 치료 효과를 향상시키고자 한다. 또한, 한국에서 온열 치료 시스템을 보유한 병원에 방문하여 본 연구를 기반으로 품질관리를 수행할 예정이며, 측정된 결과를 이용하여 허용 오차 및 정확한 set-up parameter들을 구체화하는 연구를 진행할 예정이다.

        • KCI등재

          Clinical Factors That Predict Successful Posterior Urethral Anastomosis With a Gracilis Muscle Flap

          황진호,강문형,이영태,박동수,이승렬 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.10

          Purpose: We evaluated the preoperative clinical factors that affect the surgical outcome of posterior urethral anastomosis (PUA) with a gracilis muscle flap (GMF) to determine which factors predict benefit from the use of the GMF. Materials and Methods: This was a retrospective analysis of 49 patients who underwent a delayed PUA with a GMF. A successful clinical outcome was defined as achieving a peak urinary flow rate greater than 15 mL/s at 3 and 12 months postoperatively without evidence of stricture recurrence on a retrograde urethrogram or cystourethroscopy at 3 months postoperatively. Multiple clinical factors were evaluated by use of univariate and multivariate analyses. Results: The outcome of 21 of 49 patients (42.9%) was deemed successful. The mean age of the 49 patients was 37.2±13.5 years and the mean follow-up duration was 43.4±28.0 months. The length of the urethral defect was significantly shorter in patients with a successful outcome than in patients with an unsuccessful outcome (p=0.010). The outcome differed significantly depending on whether the patients had a previously successful urethroplasty (p=0.036) or whether they had suffered a pelvic bone injury (p=0.012). Multivariate logistic regression analyses revealed that a previous urethroplasty was the only preoperative clinical factor that significantly affected the surgical outcome in PUA with a GMF (odds ratio, 0.218; 95% confidence interval, 0.050 to 0.947; p=0.042). Conclusions: A history of previous urethroplasty is a preoperative clinical factor that significantly affects the surgical outcome in PUA with a GMF; the procedure is more likely to be successful in patients who have not previously undergone urethroplasty.

        • KCI등재

          Myocardial Bridging of the Left Anterior Descending Coronary Artery: Depiction Rate and Morphologic Features by Dual-Source CT Coronary Angiography

          황진호,고성민,노홍기,송명근,신제균,지현근,김준석 대한영상의학회 2010 Korean Journal of Radiology Vol.11 No.5

          Objective: To evaluate the depiction rate and morphologic features of myocardial bridging (MB) of the left anterior descending coronary artery (LAD) using dual-source CT (DSCT). Materials and Methods: CT scans from a total of 1,353 patients who underwent DSCT were reviewed retrospectively for LAD-MB. Seventy-eight patients were excluded due to poor image quality or poor enhancement of the coronary artery. The length and depth of the MB were analyzed and classified as superficial or deep with respect to the depth (≤ 1 or > 1 mm) of the LAD tunneled segment. Superficial MB was subdivided into complete or incomplete types according to full or partial encasement of the myocardium. Results: Of the 1,275 patients included in this study, 557 cases of MB were found from 536 patients (42%). Superficial MB was observed in 368 of 557 (66%) cases, and deep MB was seen in 189 of 557 (34%) cases. Superficial MB showed 2 types: complete (128 of 368, 35%) and incomplete (240 of 368, 65%). The mean length of a tunneled segment for superficial MB was 16.4 ± 8.6 mm. The mean length and depth of a tunneled segment for deep MB were 27.6 ± 12.8 mm and 3.0 ± 1.4 mm, respectively. The incidence of atherosclerotic plaques in a 2-cm-long segment proximal to MB was 16%. Conclusion: The depiction rate of LAD-MB using DSCT in a large series of patients was 42%, with two-thirds of MB segments being the superficial type. Objective: To evaluate the depiction rate and morphologic features of myocardial bridging (MB) of the left anterior descending coronary artery (LAD) using dual-source CT (DSCT). Materials and Methods: CT scans from a total of 1,353 patients who underwent DSCT were reviewed retrospectively for LAD-MB. Seventy-eight patients were excluded due to poor image quality or poor enhancement of the coronary artery. The length and depth of the MB were analyzed and classified as superficial or deep with respect to the depth (≤ 1 or > 1 mm) of the LAD tunneled segment. Superficial MB was subdivided into complete or incomplete types according to full or partial encasement of the myocardium. Results: Of the 1,275 patients included in this study, 557 cases of MB were found from 536 patients (42%). Superficial MB was observed in 368 of 557 (66%) cases, and deep MB was seen in 189 of 557 (34%) cases. Superficial MB showed 2 types: complete (128 of 368, 35%) and incomplete (240 of 368, 65%). The mean length of a tunneled segment for superficial MB was 16.4 ± 8.6 mm. The mean length and depth of a tunneled segment for deep MB were 27.6 ± 12.8 mm and 3.0 ± 1.4 mm, respectively. The incidence of atherosclerotic plaques in a 2-cm-long segment proximal to MB was 16%. Conclusion: The depiction rate of LAD-MB using DSCT in a large series of patients was 42%, with two-thirds of MB segments being the superficial type.

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