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Injae Chung 한국항공우주학회 2017 International Journal of Aeronautical and Space Sc Vol.18 No.1
To predict the transonic buffet onset for a supercritical airfoil with shock-boundary layer interactions, a practical steady approach has been proposed. In this study, it is assumed that the airfoil flow is steady even when buffet onset occurs. Steady Navier-Stokes computations are performed on the supercritical airfoil. Using the aerodynamic parameters calculated from Navier-Stokes solver, various steady approaches for predicting buffet onset are discussed. Among the various steady approaches considered in this study, Thomas’ criterion based on Navier-Stokes computation has shown to be the most appropriate indicator of identifying the buffet onset for a supercritical airfoil with shock-boundary layer interactions. Good agreements have been obtained compared with the results of unsteady transonic wind tunnel tests. The present method is shown to be reliable and useful for transonic buffet onset for a supercritical airfoil with shock-boundary layer interactions in terms of practical engineering viewpoint.
Molecular Mechanisms of Regulation of Human Cytochrome P4501A2 Gene Expression
Injae Chung 한국생약학회 2004 Natural Product Sciences Vol.10 No.5
Cytochrome P4501A2 (CYP1A2) is responsible for the metabolic activation of a number of aromatic amines and amides to mutagenic and carcinogenic moieties. Considerable variations in the level of CYP1A2 expression in humans have been reported. Thus, the level of human CYP1A2 may determine an individuals susceptibility to these chemicals. Given its importance, the molecular mechanisms of CYP1A2 regulation have been studied by many groups. Direct interactions between transcription factors with the promoters of the gene represent one of the primary means by which the expression of CYP1A2 is controlled. In this review, several important cis elements, transcription factors and the effects of deacetylation/methylation of promoter regions that play an important role in the induction by PAHs as well as constitutive expression of human CYP1A2 are discussed.
OPTIMIZATION OF THE RAYLEIGH FADING CHANNEL MODEL IN MOBILE ENVIRONMENT
Injae Won,Changhee Kim,Youngju Kim,Keehyun Lee 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
Clarke's fading channel model is very simple simulator based on the SOS (Sum-Of-Sinusoids) and has been widely used. However, it has some shortcomings. Its time correlation properties based on the simulated waveform do not correspond to the statistical ones. In this paper, the difference between statistical and time properties of Clarke's fading channel model is examined and new simulator is proposed.
Reverse Rate Matching for Low-Power LTE-Advanced Turbo Decoders
Injae Yoo,Bongjin Kim,In-Cheol Park IEEE 2015 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 1 R Vol.62 No.12
<P>In this paper, a reverse rate matching method is presented for LTE-Advanced turbo decoders. In LTE-Advanced systems, the turbo codes are highly punctured to achieve high data rate when the channel is reliable. In that case, since only a small part of the input frame memory contains meaningful data, accessing all entries of the memory is redundant. To reduce the meaningless accesses, the proposed reverse rate matching method evaluates whether each code bit is punctured or not. As a result, more than 30% of the power consumed in accessing the input memory can be saved when the code rate is high. Furthermore, a low-complexity hardware architecture realizing the proposed method is presented for parallel-SISO decoding. By making use of a specific relationship resident in parallel input indexes, the hardware complexity of the reverse rate matching unit is reduced by 44%.</P>
A case of multiple pilomatrocoma in child with anaplastic astroblastoma
( Injae Jeong ),( Seongu Lee ),( Seongrak Seo ),( Dongju Hyun ),( Heejung Lee ),( Donghyun Kim ),( Moonsoo Yoon ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Pilomatricoma is a benign tumor most commonly found in children, occurs mostly in solitary and at a multiple of about 3%. Multiple pilomatricoma occur as idiopathic, but there is a mutation in a gene associated with the configuration of β-catenin Wnt signaling pathway in many cases. A malignancy at an early age with characteristic cutaneous manifestations occurring is to be accompanied by an indication of the CMMRD syndrome genetic testing. Because CMMRD syndrome has no specific gene therapy, required for the early diagnosis and treatment of malignancy through continuous observation An 8-years-old female presented with an asymptomatic multiple nodules on the face and trunk which had been recognized 2-years ago. The patient had a history of receiving about four years ago anaplastic astroblastoma surgery. Excisional biopsy was performed on the face. The histological finding was consistent with pilomatricoma. CMMRD syndrome was suspected on clinical findings, the MLH1, MSH2, MSH6, PMS2 immunohistochemical staining was performed in the brain tissue and skin tissue, but a loss of function mutations was not observed. We herein report a case of multiple pilomatricoma with a history of malignant brain tumors, multiple pilomatricoma with another malignant tumor at an early age need an assessment of the genetic defects.
Subungual congenital melanocytic nevus showing total melanonychia in infant
( Injae Jeong ),( Seongu Lee ),( Seongrak Seo ),( Dongju Hyun ),( Heejung Lee ),( Donghyun Kim ),( Moonsoo Yoon ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Melanonychia commonly results from melanin produced by melanocytes in the nail matrix secondary to inflammatory dermatoses or systemic medication in pediatrics. It can also be caused by a benign pigmented nevus in the matrix or malignant melanoma. Especially, subungual congenital melanocytic nevus is considered rare and only a few histologically proven pediatric cases have been reported in the literature. A 10-months-old male presented with total melanonychia and brownish patch on the periunugal area, which had been found at birth. The patient had no history of trauma and medication. A punch biopsy was performed on proximal nail matrix including toenail. The histological finding was epidermal hyperplasia and a proliferation of melanocytes with small nuclei without atypia or pleomorphism. These melanocytes were arranged in nests of different sizes in the epidermis. The diagnosis of congenital melanocytic nevus was finally made based on the clinicopathologic grounds and ongoing observation. We herein report a rare case of subungual congenital melanocytic nevus on the right 2nd toenail, which presented with total melanonychia and periungual pigmentation in infant.