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Transparent OLED Lighting Panel Design Using Two-Dimensional OLED Circuit Modeling
한준한,문재현,조두희,신진욱,주철웅,황주현,허진우,추혜용,이정익 한국전자통신연구원 2013 ETRI Journal Vol.35 No.4
In this work, we develop a simulation method to predict a two-dimensional luminance distribution method using a circuitry simulation. Based on the simulation results, we successfully fabricate large area (90 mm × 90 mm) transparent organic light-emitting diode panels with high luminance uniformity.
A new method for monitoring an OLED panel for lighting by sensing the wave-guided light
한준한,문재현,신진욱,주철웅,조두희,황주현,허진우,추혜용,이정익 한국정보디스플레이학회 2012 Journal of information display Vol.13 No.3
In this work, we report on a new monitoring method for an organic light-emitting diode (OLED) panel for lighting by optical sensing of the wave-guided light in the substrate. Using microlens array films, the wave-guided light was extracted into the edge or back side of the panel to be monitored by a photodiode. The luminance of the extracted light was measured as linearly proportional to the front light. Thus, by converting the extracted light into photo voltage, monitoring the luminance change occurring in the OLED is possible. Based on the results and concepts, we have proposed a photodiode-equipped driving circuit which can generate compensated driving current for uniform luminance of OLED panels.
Luminescence enhancement of OLED lighting panels using a microlens array film
한준한,문제현,조두희,신진욱,추혜용,이정익,조남성,이종희 한국정보디스플레이학회 2018 Journal of information display Vol.19 No.4
The enhancement of the luminance of organic light-emitting diode (OLED) panels with various areas (2.25–6084mm2) using a microlens array (MLA) film was investigated. The luminance enhancement was dependent on the viewing angle, and the largest enhancement (64%) was observed in the normal direction while 60 and 18% enhancements were observed at 60 and 30°, which led to lower enhancement (38%) of the total luminous flux compared with the luminance enhancement (64%) in the normal direction. The luminance enhancement with the MLA film also depended on the panel area, and the smaller panels showed lower luminance enhancement than the larger ones. As for the small panels, the straying light beyond the panel areas significantly affected the luminance of the panels, and over 60% luminance enhancement was observed in the normal direction for the large panels (2500 and 6084mm2) with the MLA film while only 48 and 58% luminance enhancements were observed at the small panels (2.25 and 70mm2).
한준구 대한영상의학회 1991 대한영상의학회지 Vol.27 No.4
Many patients with hepatocellualr carcioma(HCC) treated by surgical resectio experience recurrence sooner or later. The authors analyzed the angiographic features and survival data of patients treated by transarterial chemoembokization(TAE) after recurrence to evaluated the effectiveness of TAE on postoperative recurrent HCC, Sixty-nine patients with HCC were operated on before September 1989 and had recurrence. All were treated by TAE with a Lipiodol-Adriamycin mixture with or without Gelfoam embolization. Angiographic types of the recurrent HCC were the multinodular type in 57.1%, single nodular type in 27%, diffuse type in 12.7% and single nodular type with perinodal extension in 3.2%. One and two-year survival rates after recurrence were 65.8% and 43.4%, respectively, and were not significantly different from the 310 patients who were not operated on but had good liver function. A 2 year survival rate after surgery was 68.7% and significantly better than that of patients who were not operated on. With transarterial chemoembolization, the survival rate after recurrence was the same as that of patients who were not operated on. TAE can be the effective means of treating recurrent hepatocellular carcinoma.
악성 담도 폐색의 치료에서 팽창성 금속 스텐트의 효용성
한준구 대한영상의학회 1993 대한영상의학회지 Vol.29 No.3
Self expandable metallic stent is a good alternative of percutaneous transhepatic biliary drainage because it can eliminate numerous problems caused by external draingage catheter, such as tube dislodgement, bile leakage and psychotic problems. Authors analyzed initial results of self expandable metallic stents used in the patients with malignant biliary obstruction to evaluate the efficacy of the procedure and to find the technical problems in the procedure. Self expandable metallic stents were inserted in 14 patients : three with recurrent stomach cancer : three with gallbladder cancer : seven with Klatskin tumor : one with common duct cancer. Gianturco type stent was used in 9 cases ans Wallstent was used in 2 cases. In remaining three cases, both Z-stent and Wallstent were used in the same patient. The average period of follow up was 104 days (4-409 days). In 13 cases, the patency of the bile duct was restored by the stent (technical success : 92.9%) Occlusions of the stent were found in tow cases, after two재 and 13 months, respectively. Causes of failure and stent occlusion were associated duodenal obstruction, tumor overgrowth and shortening of Wallstent. In remaining 11 patients, one patient was lost to follow up an 10patients did not show recurrent jaundice until death or last follow up. There was no major complication related to the procedure. The insertion of self expandable metallic stent is a safe procedure and can eliminate major disadvantages of PTBD. Overstenting, overlapping and evaluation of associated GI tract obstruction is crucial for obtaining technical success and long-term patency.
폐 및 종격동을 침범한 유육종증 1례 보고 및 경과에 따른 임파적의 전산화단층촬영 소견과 병리조직 소견과의 비교고찰
한준구 대한영상의학회 1989 대한영상의학회지 Vol.25 No.3
Incidence of Sarcoidosis in Korea has been believed to be very low but recently there are sharp increase in number of case reports fo the sarcoidosis in Korea. And recent advance in CT made the differentiation of some kind of mediastinal lymph node disease possible on the base of lymph node enhancement pattern, Authors experienced a case of sarcoidosis involving the mediastinum the lung and the eye with tyupical radiologic pathologic & clinical features but which showed an unexpected lymph node enhancement patten on CT scan mimicking tubercu-lous lymphadenitis and characteristic histophologic features of healing sarcoid granuloma during the steroid treatment. So authors present the case with literature review and radiologic pathologic correlation with emphasis on the differentiation from tuberculous lymphadenitis.