http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Song, Hooyoung,Kim, Jin Soak,Kim, Eun Kyu,Seo, Yong Gon,Hwang, Sung-Min IOP Pub 2010 Nanotechnology Vol.21 No.13
<P>The potential of nonpolar <I>a</I>-plane InGaN/GaN multi-quantum wells (MQWs), which are free from a strong piezoelectric field, was demonstrated. An <I>a</I>-GaN template grown on an <I>r</I>-plane sapphire substrate by the multi-buffer layer technique showed high structural quality with an omega full width at half maximum value along the <I>c</I>-axis of 418 arcsec obtained from high-resolution x-ray diffraction analysis. From barrier analysis by deep level transient spectroscopy, it appeared that <I>a</I>-plane InGaN/GaN MQWs can solve the efficiency droop problem as they have a lower electron capture barrier than the <I>c</I>-plane sample. The peak shift of the temperature-dependent photoluminescence signal for the nonpolar InGaN/GaN MQWs was well fitted by Varshni’s empirical equation with zero-internal fields. A high photoluminescence efficiency of 0.27 from this sample also showed that nonpolar MQWs can be the key factor to solve the efficiency limitation in conventional <I>c</I>-plane GaN based light emitting diodes. </P>
Song, Chang Eun,Ryu, Ka Yeon,Hong, Seong-Jin,Bathula, Chinna,Lee, Sang Kyu,Shin, Won Suk,Lee, Jong-Cheol,Choi, Si Kyung,Kim, Joo Hyun,Moon, Sang-Jin Wiley-VCH 2013 ChemSusChem Vol.6 No.8
<P>We report the superior characteristics of a ZnO buffer layer covered with a phenothiazine-based, π-conjugated donor-acceptor (D-π-A)-type organic dye (called 'd-ZnO'). The use of this system for the performance enhancement of inverted bulk heterojunction polymer solar cells (PSCs) with the configuration of indium tin oxide/d-ZnO/polymer:PC71 BM/MoO3 /Ag (PC71 BM=[6,6]-phenyl C71 butyric acid methyl ester) is investigated. The layer of organic dyes anchored on the ZnO surface through carboxylate bonding reduces the shunt path on bare ZnO surface and provides better interfacial contacts and energy level alignments between the ZnO layer and the photoactive layer. This phenomenon consequently leads to highly enhanced photovoltaic parameters (fill factor, open-circuit voltage, and short-circuit current density) and power conversion efficiencies (PCEs). Inverted solar cells containing the d-ZnO layer not only revealed about 34% (PCE: 4.37%) and 18% (PCE: 7.11%) improvement in the PCEs of the representative poly-3(hexylthiophene) (P3HT) and low-band-gap poly{[4,8-bis-(2-ethyl-hexyl-thiophene-5-yl)-benzo[1,2-b:4,5-b']dithiophene-2,6-diyl]-alt-[2-(2'-ethylhexanoyl)-thieno[3,4-b]thiophen-4,6-diyl]} (PBDTTT-C-T) polymer systems, respectively, but also showed 2-4 times longer device lifetimes than their counterparts without the organic dye layer. These results demonstrate that this simple approach used in inverted PSCs with a metal oxide buffer layer could become a promising procedure to fabricate highly efficient and stable PSCs.</P>
Cellulitis presenting as necrotizing fasciitis
( Sang Youl Yun ),( Jun Gyu Song ),( Moo Kyu Suh ),( Jong Im Lee ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Cellulitis is an acute infection of the dermis and subcutaneous fat, that presents with erythema, pain, firm and tender induration, and less commonly, fluctuance. In some cases of cellulitis, the overlying epidermis undergoes bulla formation or necrosis, resulting in extensive areas of epidermal sloughing and superficial erosion. Necrotizing fasciitis is an uncommon infection of the subcutaneous soft tissue and fascia. Clinical diagnosis is often initially confused with cellulitis, and delay in diagnosis and treatment is highly lethal, so an early diagnosis and a radical debridement of all affected tissues is necessary. We report a case of cellulitis presenting as necrotizing fasciitis in a 56-year-old man. He presented with localized painful erythematous patches, hemorrhagic bullae with swelling on the left lower leg for 3 days. Laboratory tests revealed the elevated levels of WBC counts(16, 580/mm3), hepatic enzymes (AST 121IU, ALT 176IU), and CRP(15.74). He has high fever, but blood culture was negative. Skin biopsy specimen showed moderate infiltrates of mixed inflammatory cells through the dermis. MRI showed diffuse, ill-defined, irregular linear and reticular high signal intensity soft tissue change with swelling at subcutaneous fat layer of lower leg. He was treated with systemic antibiotics(cefotaxime 3g, ciprofloxacin 800mg/day). The skin lesions improved one month after treatment, and recurrence has not been observed.
Toxic epidermal necrolysis associated with methazolamide treatment
( Sang Youl Yun ),( Jun Gyu Song ),( Moo Kyu Suh ),( Tae Jung Jang ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Toxic epidermal necrolysis (TEN) is rare life-threatening disease, characterized by extensive necrosis and detachment of the epidermis. The pathophysiology of TEN is still unclear. But drugs are the most important etiologic factors. More than 100 different drugs have been implicated. High risk dugs are antibacterial sulfonamides, aromatic anticonvulsants, allopurinol, oxicam non steroidal anti-inflammatory drugs, lamotrigine and nevirapine. This disease also has been often associated with methazolamide which is a sulfonamide derivative and carbonic anhydrase inhibitor used for lowering of intraocular pressure in glucoma. We report a case of TEN induced by methazolamide on the 63-year-old glaucomatous male patient who presented with multiple, pricking erythematous macules, patches with bullae on the face, trunk, both extremities involving erosive oral mucosa. He received IVIG and corticosteroid treatment, given initially as 5g IVIG daily for 3 days and intravenous 250mg methylprednisolone daily and later changed to oral methylprednisolone. New epithelialization appeared within 2 weeks, and the lesions gradually resolved. The patient was discharged with normal oral feeding 6 weeks after admission. He has remained in good health without recurrence of symptoms during 7 months of follow-up. Methazolamide should be prescribed with caution in Korean glucomatous patients.
Song, Bong-Seok,Kim, Ji-Su,Yoon, Seung-Bin,Lee, Kyu-Sun,Koo, Deog-Bon,Lee, Dong-Seok,Choo, Young-Kug,Huh, Jae-Won,Lee, Sang-Rae,Kim, Sun-Uk,Kim, Sang-Hyun,Kim, Hwan Mook,Chang, Kyu-Tae CSIRO Publishing 2011 Reproduction, fertility, and development Vol.23 No.6
<P> Somatic cell nuclear transfer (SCNT) is a powerful tool, not only for producing cloned animals, but also in revealing various early developmental events. However, relatively little is known regarding the biological events and underlying mechanism(s) directly associated with early development of SCNT embryos. Here, we show that production of high-quality bovine SCNT blastocysts is dependent on the method used for fusion and the associated reduction in endoplasmic reticulum (ER) stress. During fusion between the donor cell and the enucleated oocyte, electrofusion triggers spontaneous oocyte activation, accompanied by an increase in intracellular Ca2+ and improper nuclear remodelling. These events can be greatly reduced by the use of Sendai virus (SV)-mediated fusion. Moreover, SV-SCNT improves the blastulation rate and blastocyst quality, defined by the number and ratio of inner cell mass and trophectoderm cells in each blastocyst, in comparison with electrofusion-mediated SCNT (E-SCNT). Interestingly, expression of ER-stress-associated genes and blastomere apoptosis were significantly increased in E-SCNT embryos. These increases could be reversed by inhibition of ER stress or by using the SV-mediated fusion method. Collectively, these results indicate that SV-mediated fusion improves the developmental competence and quality of SCNT blastocysts, by reducing ER-stress-associated apoptosis. </P>
Amelanotic melanoma mimicking eccrine poroma
( Sang Youl Yun ),( Jun Gyu Song ),( Moo Kyu Suh ),( Jong Im Lee ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Amelanotic melanoma which produces little or no pigment is a subgroup of malignant melanoma. So it is frequently mistaken clinically for a non-melanocytic neoplasm or dermatitis, which may result in a delay of diagnosis and treatment. As a consequence, previous studies have shown that it has a poor prognosis. We report a case of amelanotic melanoma occurring in 53-year-old male. The patient presented with a solitary, tender, 2.0x1.5cm-sized, well-defined erythematous ulcerative plaque with swelling and pus discharge on the right heel for 3 months. There are right inguinal lymph nodes enlargement. Skin biopsy specimen showed atypical, pleomorphic tumor cells with little melanin pigment. On immunohistochemical study, the tumor cells were positive for S-100 protein, HMB-45 and Ki-67. Because of these histologic findings, amelanotic melanoma was diagnosed. We performed whole-body PET/CT for evaluating systemic involvement. He was treated with wide excision with full thickness skin graft on the right heel and inguinal lymph node dissection. PET/CT showed hypermetabolic lesions on the right heel and right inguinal area. Based on these findings and the TMNB staging, the subject was diagnosed with stage IIIC (T4bN3M0) amelanotic melanoma. Then he is treating with adjuvant interferon-α immunotherapy.
Lentigo maligna melanoma mimicking seborrheic keratosis
( Sang Youl Yun ),( Jun Gyu Song ),( Moo Kyu Suh ),( Jong Im Lee ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Lentigo maligna melanoma(LMM) constitutes 10%-15% of cutaneous melanomas. LMM most commonly affects the sun-exposed skin of the elderly. It is frequently mistaken clinically for other pigmented neoplasms, which may result in a delay of diagnosis and treatment. It is the least common type of melanoma and rarely affects the Koreans. There are few reports regarding LMM in Korean literature. We report a case of lentigo maligna melanoma occurring in 72-year-old man. The patient presented with solitary, 1.0x1.0cm-sized, black colored plaque on left cheek. The lesion developed 9 months ago and recently the size has been increased. Skin biopsy specimen showed epidermal atrophy and proliferation of atypical melanocytes with hyperchromatic nuclei along the basal layer, solar elastosis, and invasion of melanocytes into the dermis. On immunohistochemical study, the tumor cells were positive for S-100 protein, HMB-45 and Ki-67. Therefore, lentigo maligna melanoma was diagnosed. He was treated with the wide excision with full thickness skin graft. The skin lesions were cured without recurrence.