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1.5 V Sub-mW CMOS Interface Circuit for Capacitive Sensor Applications in Ubiquitous Sensor Networks
Sungsik Lee,Ahra Lee,Chang-Han Je,Myung-Lae Lee,Gunn Hwang,Chang-Auck Choi 한국전자통신연구원 2008 ETRI Journal Vol.30 No.5
In this paper, a low-power CMOS interface circuit is designed and demonstrated for capacitive sensor applications, which is implemented using a standard 0.35-μm CMOS logic technology. To achieve low-power performance, the low-voltage capacitance-to-pulse-width converter based on a self-reset operation at a supply voltage of 1.5 V is designed and incorporated into a new interface circuit. Moreover, the external pulse signal for the reset operation is made unnecessary by the employment of the self-reset operation. At a low supply voltage of 1.5 V, the new circuit requires a total power consumption of 0.47 mW with ultra-low power dissipation of 157 μW of the interfacecircuit core. These results demonstrate that the new interface circuit with self-reset operation successfully reduces power consumption. In addition, a prototype wireless sensor-module with the proposed circuit is successfully implemented for practical applications. Consequently, the new CMOS interface circuit can be used for the sensor applications in ubiquitous sensor networks, where low-power performance is essential.
Polydimethylsiloxane induced siliconoma
( Sungsik Shin ),( Min Seok Lee ),( Howard Chu ),( Young In Lee ),( Jae Won Lee ),( Jung U Shin ),( Ju Hee Lee ) 대한피부과학회 2015 대한피부과학회 학술발표대회집 Vol.67 No.1
Filler injection is quite useful and promising for facial rejuvenation due to immediate effect and reduced risks compared with invasive surgery. However, various side effects have been reported in the literature, and polydimethylsiloxane (PDMS), one of the industrial silicones, can cause local reactions including granulomatous foreign body reactions, abscesses, draining sinuses, scarring, contractures, and deformities, and migration to distant locations and systemic complications have also been reported. A 32-year-old male presented with 3 years history of multiple pea-sized subcutaneous nodules on the forehead which showed no symptoms such as pruritus, pain, and tenderness. He had a history of PDMS injected for forehead wrinkles at the nonmedical beauty shop 7 years ago and the injected sites were getting bigger since3 years ago. A skin biopsy was done to figure out foreign body reactions, and the slide revealed foreign body granulomas in the superficial dermis. There are many different treatment options to reduce granulomas. Systemic corticosteroids are the most widely used and surgical removal could be an option although there are limitations of the aggressiveness and difficulty of fully removing the widely disseminated filler materials. And there is also a report about successful treatment with combination of Nonablative Fractional and Ablative Fractional Lasers.
외국인 유학생을 위한 모듈식 한국학 교육과정 체계 연구
이선중 ( Sunjoong Lee ),윤지원 ( Jiwon Yoon ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.3
본 연구는 교양학위로서 ‘한국학’의 개념을 보다 명시화하고 이를 체계적으로 교육할 수 있는 방안으로 교육과정의 모듈화를 제안하는 것을 목적으로 한다. 이를 위해 모듈식 교수-학습 이론 및 유학생을 위한 한국학 교육에 대한 논의를 검토·분석한 후, 기존 이론 및 논의에 입각하여 한국학 교육과정을 모듈화 하는 방안을 제안하였다. 모듈화를 통해 동일한 학교 안에서라도 학습자의 한국어 수준이나 요구에 따라 한국학 교육을 개별화할 수 있도록 교육과정을 체계화하였다. 한국학 교육과정의 체계화는 진정한 의미에서 대학을 국제화시키며 다양한 문화와 인종의 학생들을 한데 모으는 역할로 단순히 개별 대학의 경쟁력을 높이는 방안에 그치지 않고 한국 고등 교육의 미래를 밝히는 필수적인 전제가 될 것이다. 차후 연구 과제는 유학생의 요구와 세계의 지한 인재의 역할에 입각하여 교육 내용과 교과목을 개발하는 것이다. This study aims to suggest a modularity of curriculum to specify the idea of ‘Korean studies’ as a liberal arts degree and as a method of educating systematically. In order to happen, we have suggested a way of modulating the curriculum of Korean studies based on the existing theory and discussion, after examining and analyzing education of Korean studies for a modular teaching-learning theory and foreign students. Through a modularity, we have organized the curriculum to individualize korean study according to a level of learners’ Korean ability and their needs despite of being in the same college. The systemization for curriculum of Korean studies plays a role to internalize the college in true meaning and gather the students from the various cultures and races. This is not only a method to make each college more competitive but also an essential precondition to light up the future of higher education of Korea. Our further study is to develop the course content and a subject grounded on foreign students’ needs and roles of the outstanding individual knowing much of Korea.
Lee, Sangyoon,Park, Sungsik,Kim, Chang-Wan,Lee, Dongjin,Lee, Chongmu,Jin, Changhyun Elsevier 2016 THIN SOLID FILMS - Vol.598 No.-
<P><B>Abstract</B></P> <P>A hydrothermal-based synthesis technique was used to produce both amorphous and nano-grained NiO nanowires. The scanning electron microscopy images showed the morphologies before and after annealing treatment at 350 and 400°C for 2h. The microstructural features of the mixed amorphous and local crystalline in as-synthesized NiO and polycrystalline in annealed NiO were characterized by X-ray diffraction, transmission electron microscopy, and high-resolution transmission electron microscopy, respectively. The corresponding elemental compositions were determined via energy-dispersive X-ray. In addition, annealing-dependent effects on the photoluminescence spectra were observed in at least two different energy band regions, e.g., at ~395, 660, and 680nm. The photoluminescence properties, including intensity and energy, of the individual NiO nanowires varied significantly with microstructural changes arising from nickel and oxygen defects from annealing the as-synthesized amorphous NiO. The microstructural and optical origin of as-synthesized amorphous and annealed nano-grained NiO nanowires is discussed on the basis of the aforementioned results.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Amorphous and nano-grained NiO nanowires were synthesized. </LI> <LI> The structures have changed from amorphous to crystalline after annealing. </LI> <LI> The different PL properties may have resulted from annealing effects. </LI> </UL> </P>
Analysis of Adhesion Strength of Laminated Copper Layers in Roll-to-Roll Lamination Process
Lee, Jongsu,Park, Sungsik,Park, Janghoon,Cho, Young Seek,Shin, Kee-Hyun,Lee, Dongjin Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.9
The roll-to-roll (R2R) lamination process is a promising technology for the fabrication of flexible electronic devices on large areas such as solar cells or organic light emitting diodes. In this study, mechanical factors in the R2R lamination process that affect the adhesion strength of laminated composite were studied by finite-element simulation based on a theoretical model. Moreover, the effect of mechanical factors on the attenuation of adhesion strength was evaluated by using a full factorial design of experiment. The results show that the adhesive strength of the laminated composite decreases as the operating tension and strain rate increase. However, the radius of the roller has the opposite tendency to the operating tension. Non-linear regression model was developed to express the adhesion strength according to the mechanical factors, followed by the determination of their ranges to minimize peel-off. The suggested analysis method, devices and non-linear regression model could be used as a guideline to pre-determine the operating conditions in the R2R lamination process before manufacturing laminated composites.
Sub-1-V Supply Self-Adaptive CMOS Image Sensor Cell With 86-dB Dynamic Range
Lee, Sungsik,Yang, Kyounghoon IEEE 2007 IEEE electron device letters Vol.28 No.6
<P> This letter presents a high dynamic range CMOS active pixel structure operating at a sub-1-V supply voltage, which is implemented using a standard 0.18-<TEX>$\mu\hbox{m}$</TEX> CMOS logic process. In order to improve the output voltage swing range and associated pixel dynamic range at a low supply voltage, a pMOS reset structure is incorporated into the pixel structure along with a photogate pixel structure based on the self-adaptive photosensing operation. At a low supply voltage of 0.9 V, the new pixel provides an output voltage swing range of 0.41 V and a high dynamic range of 86 dB, which is the highest among the reported pixel structures up to date operating at sub-1-V. </P>
( Sungsik Shin ),( Jung U Shin ),( Youngin Lee ),( Woong Youn Chung ),( Kee-hyun Nam ),( Tae Gwang Kwon ),( Ju Hee Lee ) 대한피부과학회 2017 Annals of Dermatology Vol.29 No.3
Background: Growth factors play important roles in wound healing. However, the evidence for the effects of growth factors on post-thyroidectomy scars is limited. Objective: We performed a prospective study to assess the preventive and therapeutic effect of a multi-growth factor (MGF)-containing cream on post-thyroidectomy scars. Methods: Twenty-one patients with thyroidectomy scars applied MGF cream twice a day. We assessed the changes in erythema, pigmentation, skin elasticity, and skin hydration status using the erythema index, melanin index, cutometer, and corneometer, respectively. In addition, Vancouver scar scale (VSS) and patient satisfaction were assessed at 10 days after surgery (baseline), 2 weeks, 6 weeks, and 12 weeks after baseline. Results: The mean total VSS scores were significantly lower at 6 weeks (3.24±1.51 vs. 1.91±1.38) and 12 weeks (3.24±1.51 vs. 1.71±1.59) compared to the baseline. The degree of pigmentation was significantly lower at 12 weeks compared to the baseline, and the skin elasticity, and the skin hydration status were significantly higher at 12 weeks compared to the baseline. Over 85% of the patients were satisfied with the use of MGF cream without any adverse effect. Conclusion: MGF cream might have additive or supportive effect for scar formation after thyroidectomy. (Ann Dermatol 29(3) 314∼320, 2017)