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Graphene transfer in vacuum yielding a high quality graphene
Lee, Sangchul,Lee, Sang Kyung,Kang, Chang Goo,Cho, Chunhum,Lee, Young Gon,Jung, Ukjin,Lee, Byoung Hun Elsevier 2015 Carbon Vol.93 No.-
<P><B>Abstract</B></P> <P>The importance of proper graphene transfer process cannot be emphasized more because it is so closely related to the performance and stability of graphene devices. In this work, a new transfer method utilizing a voluntary bonding of a graphene film to a target substrate in vacuum is demonstrated. The problems originated from water and air molecules which prevent a robust bonding and degrade the electrical characteristics could be drastically alleviated. As a result, graphene field-effect transistors showed nearly symmetric <I>I</I> <SUB>d</SUB>–<I>V</I> <SUB>g</SUB> characteristics with a minimal hysteresis and drastically improved device stability in air for more than a month could be obtained.</P>
X-band Linac for a 6MeV dual-head radiation therapy gantry
Lee, Seung Hyun,Shin, Seung-Wook,Lee, Jongchul,Kim, Hui-Su,Lee, Byeong-No,Lee, Byung-Chul,Park, Hyung-dal,Song, Ki-back,Song, Ho-seung,Mun, Sangchul,Ha, Donghyup,Chai, Jong-Seo Elsevier 2017 Nuclear Instruments & Methods in Physics Research. Vol.852 No.-
<P><B>Abstract</B></P> <P>We developed a design for a 6MeV X-band linear accelerator for radiation therapy in a dual-head gantry layout. The dual-head gantry has two linacs that can be operated independently. Each X-band linac accelerates electron bunches using high-power RF and generates X-rays for radiation therapy. It requires a versatile RF system and pulse sequence to accomplish various radiation therapy procedures.</P> <P>The RF system consists of 9.3GHz, 2MW X-band magnetron and associated RF transmission components. A test linac was assembled and operated to characterize its RF performance without beam. This paper presents these results along with a description of the gantry linacs and their operational requirements.</P>
Hakmin Lee,Dong Hwan Lee,Younsoo Chung,Ngoc Ha Nguyen,Jong Jin Oh,Sangchul Lee,Sang Eun Lee,Sung Kyu Hong,Seok-Soo Byun 대한비뇨기종양학회 2017 대한비뇨기종양학회지 Vol.15 No.3
Purpose: We tried to investigate the clinical impact of Ki-67 (MIB-1) expression on the oncological and survival outcomes in patients with bladder cancer (BCa) after the radical cystectomy. Materials and Methods: We retrospectively analyzed the data of 230 patients who were treated by radical cystectomy for BCa. Multivariate Cox-proportional hazards models and logistic regression tests were performed to evaluate the prognostic value of each variable. Results: The patients with positive Ki-67 expression showed significant worse clinical characteristics and pathologic outcomes than negative Ki-67 group. Furthermore, the patients with Ki-67 expression showed significant worse recurrence (p=0.018) and cancer-specific mortality free survival (p=0.019) than negative Ki-67 group. The overall survival was also revealed to be inferior in Ki-67 positive group than Ki-67 negative group but the statistical significance was marginal (p=0.062). Subsequent multivariate Cox analyses showed that Ki-67 was independent predictor for disease recurrence after surgery (hazard ratio, 3.142; 95% CI, 1.287–7.671; p=0.012). Conclusions: In our study, high Ki-67 expression was significantly related with worse clinical outcomes after radical cystectomy in the patients with BCa. Further prospective and basic researches are needed to validate the true prognostic value of Ki-67.
Effects of infections with five sexually transmitted pathogens on sperm quality
Kim, Sung Jae,Paik, Doo-Jin,Lee, Joong Shik,Lee, Hyo Serk,Seo, Ju Tae,Jeong, Mi Seon,Lee, Jae-Ho,Park, Dong Wook,Han, Sangchul,Lee, Yoo Kyung,Lee, Ki Heon,Lee, In Ho,So, Kyeong A,Kim, Seon Ah,Kim, Jur The Korean Society for Reproductive Medicine 2017 Clinical and Experimental Reproductive Medicine Vol.44 No.4
Objective: This study investigated the prevalence of infections with human papillomavirus, Chlamydia trachomatis, Ureaplasma urealyticum, Mycoplasma hominis, and Mycoplasma genitalium in the semen of Korean infertile couples and their associations with sperm quality. Methods: Semen specimens were collected from 400 men who underwent a fertility evaluation. Infection with above five pathogens was assessed in each specimen. Sperm quality was compared in the pathogen-infected group and the non-infected group. Results: The infection rates of human papillomavirus, C. trachomatis, U. urealyticum, M. hominis, and M. genitalium in the study subjects were 1.57%, 0.79%, 16.80%, 4.46%, and 1.31%, respectively. The rate of morphological normality in the U. urealyticum-infected group was significantly lower than in those not infected with U. urealyticum. In a subgroup analysis of normozoospermic samples, the semen volume and the total sperm count in the pathogen-infected group were significantly lower than in the non-infected group. Conclusion: Our results suggest that infection with U. urealyticum alone and any of the five sexually transmitted infections are likely to affect sperm morphology and semen volume, respectively.
Poly(A) RNA and Paip2 act as allosteric regulators of poly(A)-binding protein
Lee, Seung Hwan,Oh, Jungsic,Park, Jonghyun,Paek, Ki Young,Rho, Sangchul,Jang, Sung Key,Lee, Jong–,Bong Oxford University Press 2014 Nucleic acids research Vol.42 No.4
<P>When bound to the 3′ poly(A) tail of mRNA, poly(A)-binding protein (PABP) modulates mRNA translation and stability through its association with various proteins. By visualizing individual PABP molecules in real time, we found that PABP, containing four RNA recognition motifs (RRMs), adopts a conformation on poly(A) binding in which RRM1 is in proximity to RRM4. This conformational change is due to the bending of the region between RRM2 and RRM3. PABP-interacting protein 2 actively disrupts the bent structure of PABP to the extended structure, resulting in the inhibition of PABP-poly(A) binding. These results suggest that the changes in the configuration of PABP induced by interactions with various effector molecules, such as poly(A) and PABP-interacting protein 2, play pivotal roles in its function.</P>
Enhanced Charge Injection in Pentacene Field‐Effect Transistors with Graphene Electrodes
Lee, Sangchul,Jo, Gunho,Kang, Seok‐,Ju,Wang, Gunuk,Choe, Minhyeok,Park, Woojin,Kim, Dong‐,Yu,Kahng, Yung Ho,Lee, Takhee Wiley - VCH Verlag GmbH & Co. KGaA 2011 Advanced Materials Vol. No.
<P><B>Pentacene organic field‐effect transistors</B> with multilayer graphene electrodes exhibit a lower contact resistance and lower charge‐injection barrier height than those with conventional Au electrodes. This enhancement in performance is related to the favorable dipole layer formation at the graphene/pentacene interface. </P>
Evaluating Performance of Android Platform Using Native C for Embedded Systems
Sangchul Lee,Jae Wook Jeon 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
The Android platform used for mobile devices can be applied to embedded systems, such as robot control systems. Developers should create applications by using Java language provided by Android SDK for embedded systems operated via Android platforms. However, in many existing embedded systems, developers have written applications for controlling the system by using C language. Android NDK makes it possible for developers to easily reuse such legacy code written in C/C++ languages. In this paper, we show the difference in terms of performance between an Android application using native code library from C source and an Android application using the same algorithm written in Java language only. We conducted an experiment on five parts: JNI communication delay, integer calculation, floating-point calculation, memory access algorithm, and heap memory allocation algorithm. This paper presents a guideline for an effective way to use native code libraries in Android applications.
Integrating Rhetorical Criticism into Business Communication as an Interdisciplinary Approach
Sangchul Lee 한국경영커뮤니케이션학회 2019 Business Communication Research and Practice Vol.2 No.1
Objectives:The purpose of this paper is to suggest integrating rhetorical analysis and criticism into business communication research and pedagogy. Rhetorical analysis and criticism on public addresses of business leaders can provide important insights into the political and social issues of the community and the economic impact of the participants. Such an analysis would contribute to the development of communication scholarship taking place at the intersection of business communication, rhetoric, and society. Methods:This paper reviews articles on the rhetoric of business leaders published in business communication journals (e.g., Journal of Business Communication, Business and Professional Communication Quarterly, Management Communication Quarterly, Journal of Business and Technical Communication, Technical Communication Quarterly). It examines the purpose of rhetorical criticism in business communication and discusses popular criticism methods. Among the various perspectives on rhetorical criticism in the field of speech communication, this stduy discusses three commonly adopted methods – Neo-Aristotelian criticism, Genre Criticism, and Narrative criticism. Results:Studies on the rhetorical criticism of speeches of business leaders are not systematically integrated into business communication education and research. Rhetorical critics of speech communication are more interested in public speeches by prominent politicians or social leaders, while business communication scholars are more concerned with rhetorical theory and pedagogy. Conclusions:Integrating rhetorical criticism into business communication as an interdisciplinary approach infuses a new approach that goes beyond the domains of contemporary research and pedagogy. Integrating rhetorical criticism into business communication not only improves the quality of discourse in business society but also tests and modifies both the theory and practice of corporate rhetoric.