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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.
InJae Lee 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
We revisit a recent report on the coexisting phases of a superconductor and a spin density wave (SDW) insulator that were found in a quasi-one-dimensional system, (TMTSF)2PF6, in a narrow pressure range between 5.5 − 6.4 kbar. Simultaneous nucleus magnetic resonance (NMR) and transport measurements confirm that there exits macroscopic domains of SDW and metallic/superconducting regions with one having little influence on the other resulting strong hysteretic effects in temperatures and magnetic fields as the fraction of the SDW insulating phase changes. Our results strongly support the domain model for the unusually weak orbital superconducting pair-breaking effects observed in the system.
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.
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.
Speech Intelligibility of Korean EFL Learners : Role of Proficiency, Text Type and Text Length
Injae Lim,Jeong-Im Han,Taehwan Choi,Joo-Kyeong Lee 아시아영어교육학회 2016 The Journal of Asia TEFL Vol.13 No.4
The purpose of this study was to investigate whether and to what extent the intelligibility of Korean EFL learners’ speech at the text level is affected by their English proficiency, text type, and text length. Various speech materials produced by native English speakers and two Korean EFL speaker groups (high vs. low proficiency) were presented to native English listeners and two Korean EFL listener groups, respectively, for comparison of intelligibility scores. The results showed that the listeners’ overall proficiency played the most critical role in determining the level of speech intelligibility for all speaker groups, regardless of the type and length of speech materials. The speakers’ proficiency level in terms of pronunciation, however, had no significant effect. As for the text type, dialogue texts were consistently more intelligible than monologues to all listener groups while the effect of text length varied depending on the text type. These results suggest that L2 learners’ speech intelligibility needs to be examined within the context of natural L2 text beyond word- and sentence-level utterances in consideration of the interaction of text-related features and other learner variables. Some pedagogical implications are also discussed.
Tail-Overlapped SISO Decoding for High-Throughput LTE-Advanced Turbo Decoders
Injae Yoo,Bongjin Kim,In-Cheol Park IEEE 2014 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS PART 1 R Vol.61 No.9
<P>This paper proposes a novel decoding algorithm to enhance the throughput of turbo decoding in LTE-Advanced systems and its hardware realization. The proposed method completely removes the undesired phase-switching latency by partially overlapping in-ordered and interleaved decoding phases, and as a result, achieves a significant increase of decoding throughput. Moreover, the algorithm does not degrade error-correcting performance for high-rate codes which are essential to achieve the maximum data rate of LTE-Advanced systems. The proposed method called tail-overlapped decoding can be easily applied to the conventional parallel decoding architecture designed for standardized communication systems. In addition, a new structure for the extrinsic information memory is proposed to eliminate memory contentions. A 3GPP LTE-Advanced turbo decoder supporting both decoding methods is implemented in 0.13 μm CMOS technology to show the effectiveness of the proposed algorithm. The decoder exhibits a decoding rate greater than 1Gbps with six iterations, meeting the peak data rate of the LTE-Advanced standard with much less hardware complexity than those of the previous works.</P>