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Huh, Chul,Kim, Bong Kyu,Park, Byoung-Jun,Jang, Eun-Hye,Kim, Sang-Hyeob Springer 2013 Nanoscale research letters Vol.8 No.1
<P>We report an enhancement in light emission efficiency of Si nanocrystal (NC) light-emitting diodes (LEDs) by employing 5.5 periods of SiCN/SiC superlattices (SLs). SiCN and SiC layers in SiCN/SiC SLs were designed by considering the optical bandgap to induce the uniform electron sheet parallel to the SL planes. The electrical property of Si NC LED with SiCN/SiC SLs was improved. In addition, light output power and wall-plug efficiency of the Si NC LED with SiCN/SiC SLs were also enhanced by 50% and 40%, respectively. This was attributed to both the formation of two-dimensional electron gas, i.e., uniform electron sheet parallel to the SiCN/SiC SL planes due to the conduction band offset between the SiCN layer and SiC layer, and an enhanced electron transport into the Si NCs due to a lower tunneling barrier height. We show here that the use of the SiCN/SiC SL structure can be very useful in realizing a highly efficient Si NC LED.</P>
Highly transparent Pt ohmic contact to InGaN / GaN blue light - emitting diodes
Chul Huh,Hyun-Soo Kim,Sang-Woo Kim,Ji-Myon Lee,Dong-Joon Kim,Hyun-Min Kim,Seong-Ju Park 한국진공학회(ASCT) 2000 Journal of Korean Vacuum Science & Technology Vol.4 No.2
We report on the fabrication and characterization of InGaN/GaN multiple quantum well light-emitting diode (LED) with a highly transparent Pt ohmic contact as a current spreading layer. The value of light transmittance of a Pt thin film with a thickness of 8 ㎚ on p-GaN was measured to be 85% at 450 ㎚. The peak wavelength and the full-width at half-maximum (FWHM) of the emission spectrum of the LED at 20 ㎃ were 453 ㎚ and 23 ㎚, respectively. Pt-contacted LEDs show good electrical properties and high light-output efficiency compared to Ni/Au-contacted ones. These results suggest that a Pt thin film can be used as an effective current spreading layer with high light-transparency.
Chul Beom Cho,Jae Keon Kim,Do Sung Yoo,Kyong Suok Cho,Dal Soo Kim,Pil Woo Huh 대한신경외과학회 2003 Journal of Korean neurosurgical society Vol.34 No.4
Objective:The three-dimensional computed tomographic angiography(3D-CTA) images are not commonly used than the conventional digital subtraction angiography(DSA) as a postoperative examination to identify a remnant neck or whether the parent and branching arteries and the cerebral aneurysm are clipped together. We suggest that the neurosurgeons themselves can reconstruct 3D images using 3D reconstruction program in their personal computers and evaluate the aneurysm neck clipping state more precisely than DSA. Methods : Both 3D-CTA and DSA images were obtained postoperatively on 40 patients with 45 cerebral aneurysms. 38 aneurysms were clipped by single clip, 6 by double clips, and 1 by triple clips. We compared 3D-CTA images, which are made by easy and noninvasive method of the new software to ascertain postoperatively the perfection of aneurysm neck clipping performed with titanium clips, with DSA. Results : Out of the total 45 cerebral aneurysms clipped with titanium clips, 3D-CTA clearly showed the state of the clipped necks and the parent and branching arteries of 44 aneurysms in 39 cases. There were three cases in which the remnant necks were found in 3D-CTA, but two of them were not identified in DSA. There was one patient who had cerebral aneurysms requiring 3 clips, resulting in a poor view of the remnant necks since the clips covered the necks. Conclusion : In case using one or two titanium clips for the aneurysmal clipping, 3D-CTA may be a reliable alternative method to DSA in the postoperative evaluation to define the cerebral aneurysm neck and the surrounding vessels after clipping. Key words:3D-CTA;Cerebral aneurysm;Digital subtraction angiography;Titanium clip.
Highly transparent Pt ohmic contact to InGaN / GaN blue light - emitting diodes
Huh, Chul,Kim, Hyun-Soo,Kim, Sang-Woo,Lee, Ji-Myon,Kim, Dong-Joon,Kim, Hyun-Min,Park, Seong-Ju The Korean Vacuum Society 2000 Journal of Korean Vacuum Science & Technology Vol.4 No.3
We reprot on the fabrication and characterization of InGaN/GaN multiple quantum well light-emitting diode (LED) with a highly transparent Pt ohmic contact as a current spreading layer. The value of light transmittance of a Pt thin film with a thickness of 8 nm on-GaN was measured to be 85% at 450 nm. The peak wavelength and the full-width at half-maximum (FWHM) of the emission spectrum of the LED at 20 mA were 453 nm and 23 nm, respectively. Pt-contacted LEDs show good electrical properties and high light-output efficiency compared to Ni/Au-contacted ones. These results suggest that a Pt thin film can be used as an effective current spreading layer with high light-transparency.
Pseudolymphoma Induced by Ear Piercing
Huh, Chang Hun,Park, Je Young,Won, Chong Hyun,Eun, Hee Chul,Moon, Sang Eun 대한피부과학회 2004 Annals of Dermatology Vol.16 No.1
We present a patient who developed a pseudolymphoma after ear piercing. A patch test showed gold sensitivity. Therefore, long standing dermal exposure to gold from a pierced-type earring might have produced the patient's disease. This patient did not respond to an intralesional steroid injection and was finally treated with a complete resection of the lesion. It is proposed that every patient with a hyperplastic lesion in the ear lobe should be taken a biopsy in order to rule out the possibility of a pseudolymphoma. When a pseudolymphoma develops in the ear lobe, a complete surgical excision could be the treatment of choice, especially for the prevention of recurrence.