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An efficient ME scheme for H.264 to SVC transcoder
Ju-Heon Seo,Jae-Gon Kim,Jong-Ki Han 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
Transcoding is an important technique for heterogenous networks and devices whose bandwidths and coding schemes are diverse and various. When video sequence is encoded by H.264 in transmitter, the capability and codec standard used in the receiver are not considered. This fact results in a great lack of flexibility in the complex network supporting various codec standards. An efficient way to solve these problems is to use a transcoder that provides a match between coding schemes. H.264 to SVC transcoding is an interesting research topic and has various applications. We propose an efficient motion vector estimation scheme for H.264 to SVC transcoding. In the proposed algorithm, the MVs and mode information decoded in H.264 part of the transcoder are reused in ME/MD of SVC encoder. Experimental results show that the proposed approach can significantly reduce the computational complexity of the transcoder while the generated bit rate and the image qualities are unchanged.
Ju, Won Seok,Song, Ilchan,Park, Se-Ra,Seo, Sang Young,Cho, Jin Hyoung,Min, Sung-Hun,Kim, Dae-Heon,Kim, Ji-Su,Kim, Sun-Uk,Park, Soon Ju,Ko, Kisung,Choo, Young-Kug The Korean Society of Plant Biotechnology 2019 식물생명공학회지 Vol.46 No.3
Production of therapeutic monoclonal antibodies (mAbs) using a plant platform has been considered an alternative to the mammalian cell-based production system. A plant-derived mAb CO17-1AK ($mAb^P$ COK) can specifically bind to various types of cancer cell lines. The target protein of $mAb^P$ COK is the epithelial cell adhesion molecule (EpCAM) highly expressed in human epithelial cancer cells, including breast and colorectal cancer cells. It has been hypothesized that its overexpression supports tumor growth and metastasis. A ganglioside is extended well beyond the surfaces of the various cell membranes and has roles in cell growth, inflammation, differentiation, and carcinogenesis. However, the regulation of EpCAM gene expression in breast cancers and the role of gangliosides in oncogenesis are unclear. Here, the purpose of this study was to determine the effects of $mAb^P$ COK on human breast cancer cell proliferation, apoptosis, and ganglioside expression patterns. Our results show that treatment with $mAb^P$ COK suppressed the growth of breast cancer cells and induced apoptotic cell death. It also upregulated the expression of metastasis-related gangliosides in breast cancer cells. Thus, treatment with $mAb^P$ COK may have chemo-preventive therapeutic effects against human breast cancer.
Fully Transparent Quantum Dot Light-Emitting Diode Integrated with Graphene Anode and Cathode
Seo, Jung-Tak,Han, Junebeom,Lim, Taekyung,Lee, Ki-Heon,Hwang, Jungseek,Yang, Heesun,Ju, Sanghyun American Chemical Society 2014 ACS NANO Vol.8 No.12
<P>A fully transparent quantum dot light-emitting diode (QD-LED) was fabricated by incorporating two types (anode and cathode) of graphene-based electrodes, which were controlled in their work functions and sheet resistances. Either gold nanoparticles or silver nanowires were inserted between layers of graphene to control the work function, whereas the sheet resistance was determined by the number of graphene layers. The inserted gold nanoparticles or silver nanowires in graphene films caused a charge transfer and changed the work function to 4.9 and 4.3 eV, respectively, from the original work function (4.5 eV) of pristine graphene. Moreover the sheet resistance values for the anode and cathode electrodes were improved from ∼63 000 to ∼110 Ω/sq and from ∼100 000 to ∼741 Ω/sq as the number of graphene layers increased from 1 to 12 and from 1 to 8, respectively. The main peak wavelength, luminance, current efficiency, and optical transmittance of the fully transparent QD-LED integrated with graphene anode and cathode were 535 nm, ∼358 cd/m<SUP>2</SUP>, ∼0.45 cd/A, and 70–80%, respectively. The findings of the study are expected to lay a foundation for the production of high-efficiency, fully transparent, and flexible displays using graphene-based electrodes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2014/ancac3.2014.8.issue-12/nn505316q/production/images/medium/nn-2014-05316q_0006.gif'></P>
CASE REPORT : A Case of Langerhans Cell Histiocytosis Manifested as a Suprasellar Mass
( Ju Young Yoon ),( Byung Kiu Park ),( Heon Yoo ),( Sang Hyun Lee ),( Eun Kyung Hong ),( Weon Seo Park ),( Young Joo Kwon ),( Jong Hyung Yoon ),( Hyeon Jin Park ) 대한뇌종양학회 대한신경종양학회 2016 Brain Tumor Research and Treatment Vol.4 No.1
Langerhans cell histiocytosis (LCH) has diverse clinical manifestations, including intracranial mass lesions. We report a case of LCH that manifested as a suprasellar mass, and initially misdiagnosed as a germ cell tumor. A 29-year-old woman presented with polyuria, polydipsia and amenorrhea. Laboratory findings revealed hypopituitarism with central diabetes insipidus, and a suprasellar mass and a pineal mass were observed on magnetic resonance imaging. Under the clinical impression of a germ cell tumor, the patient was treated with germ cell tumor chemotherapy (cisplatin and etoposide) and radiation therapy without biopsy. After initial shrinkage of the lesions, further growth of the tumor was observed and a biopsy was performed. The histopathology revealed LCH. After chemotherapy according to the LCH III protocol, the tumor disappeared. She is on regular follow up for 5 years without relapse. The present findings indicate that LCH should be included in the differential diagnosis of a suprasellar mass, even in adults, especially when it manifests with diabetes insipidus. This case also underscores the importance of a histopathologic diagnosis in patients with suprasellar tumors before the initiation of a specific therapy, even if the clinical findings are highly suggestive of a specific diagnosis.
Controlled sub-nanometer tuning of photonic crystal resonator by carbonaceous nano-dots
Seo, Min-Kyo,Park, Hong-Gyu,Yang, Jin-Kyu,Kim, Ju-Young,Kim, Se-Heon,Lee, Yong-Hee The Optical Society 2008 Optics express Vol.16 No.13
<P>We propose and demonstrate a scheme that enables spectral tuning of a photonic crystal high-quality resonant mode, in steps finer than 0.2 nm, via electron beam induced deposition of carbonaceous nano-dots. The position and size of a nano-dot with a diameter of <100 nm are controlled to an accuracy on the order of nanometers. The possibility of selective modal tuning is also demonstrated by placing nano-dots at locations pre-determined by theoretical computation. The lasing threshold of a photonic crystal mode tends to increase when a nano-dot is grown at the point of strong electric field, showing the absorptive nature of the nano-dot.</P>
Polarized vertical beaming of an engineered hexapole mode laser
Kang, Ju-Hyung,Seo, Min-Kyo,Kim, Sun-Kyung,Kim, Se-Heon,Kim, Myung-Ki,Park, Hong-Gyu,Kim, Ki-Soo,Lee, Yong-Hee The Optical Society 2009 Optics express Vol.17 No.8
<P>We demonstrate vertical beaming of linearly-polarized light from the hexapole mode of an engineered single-cell photonic crystal cavity by employing the solid angle scanning system. The vertical emission that is forbidden by the inner symmetry of the hexapole mode is made possible by perturbing its symmetry. Experimentally 56% of photons are funneled within a divergence angle of +/-30 degrees. Measured polarization-resolved far-field profiles of the engineered hexapole mode agree well with those of the predictions of finite difference time domain methods.</P>
Lee Heon Ju,Hwang Seo Jin,Jeong Eun Hee,Chang Mi Hee 한국미생물학회 2024 The journal of microbiology Vol.62 No.7
This study aimed to develop synthetic Claudin18.2 (CLDN18.2) chimeric antigen receptor (CAR)-T (CAR-T) cells as a treatment for advanced gastric cancer using lentiviral vector genetic engineering technology that targets the CLDN18.2 antigen and simultaneously overcomes the immunosuppressive environment caused by programmed cell death protein 1 (PD-1). Synthetic CAR T cells are a promising approach in cancer immunotherapy but face many challenges in solid tumors. One of the major problems is immunosuppression caused by PD-1. CLDN18.2, a gastric-specific membrane protein, is considered a potential therapeutic target for gastric and other cancers. In our study, CLDN18.2 CAR was a second-generation CAR with inducible T-cell costimulatory (CD278), and CLDN18.2-PD1/CD28 CAR was a third-generation CAR, wherein the synthetic PD1/CD28 chimeric-switch receptor (CSR) was added to the second-generation CAR. In vitro, we detected the secretion levels of different cytokines and the killing ability of CAR-T cells. We found that the secretion of cytokines such as interferon-gamma (IFN-γ) and tumor necrosis factor-alpha (TNF-α) secreted by three types of CAR-T cells was increased, and the killing ability against CLDN18.2-positive GC cells was enhanced. In vivo, we established a xenograft GC model and observed the antitumor effects and off-target toxicity of CAR-T cells. These results support that synthetic anti-CLDN18.2 CAR-T cells have antitumor effect and anti-CLDN18.2-PD1/CD28 CAR could provide a promising design strategy to improve the efficacy of CAR-T cells in advanced gastric cancer.