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양지웅,이정일 대한신경외과학회 2003 Journal of Korean neurosurgical society Vol.33 No.4
The authors report two cases of intramedullary metastasis from breast cancer and melanoma respectively. Both patients presented with rapidly progressing paraparesis. They were treated by laminectomy with microsurgical extirpation of the tumor and whole spine irradiation. The patient with melanoma died at 3 months postoperatively and the other with breast cancer is still alive for 40 months after being diagnosed of spinal cord metastasis. The prognosis of intramedullary spinal cord metastasis is known to be poor, however, early diagnosis and radical surgery before irreversible deterioration of neurologic status can prolong functional survival. Key words:Intramedullary metastasis;Breast cancer;Melanoma.
Polymer-Assisted High-Resolution Printing Techniques for Colloidal Quantum Dots
양지웅,유지수,유원석,최문기 한국고분자학회 2021 Macromolecular Research Vol.29 No.6
Over the last several decades, colloidal quantum dots (QDs) have been widely studied because of their unique optical and electronical properties such as band gap tunability, extremely high color purity, and efficient light absorption and emission. Consequently, they have been regarded as promising materials for nextgeneration optoelectronic devices such as displays, image sensors, and solar cells. Because these devices employ solid state forms of colloidal QD ensembles, the development of the processes that can tailor their 3D architecture is essential. Here, this review article explores the recent progress of the high-resolution printing techniques for colloidal QDs. Specifically, we present a wide range of methods including photolithography, inkjet printing, nanoimprinting, and transfer printing. We also discuss how these printing methods have been inspired by the patterning techniques for polymer-based materials.
양지웅,임옥택 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.6
We compared the spray characteristics of a typical fuel (100% diesel, DME) and diesel-DME blended fuel in a constant volume combustionchamber (CVCC). The typical fuel (100% diesel, DME) and diesel-DME blended fuel spray characteristics were investigated atvarious ambient pressures (pressurized nitrogen) and fuel injection pressures using a common rail fuel injection system when the fuelmixture ratio was varied. The fuel injection quantity and spray characteristics were measured including spray shape, penetration length,and spray angle.
교통신호등 형태별 운전자 인지반응 시간 비교 연구: 등화 색상 및 조합에 따른 비서술적/서술적 기억 활용
양지웅,김진태,김주영 대한교통학회 2018 대한교통학회지 Vol.36 No.4
국제사회는 3개 렌즈(적, 황, 녹) 교통신호등 사용을 표준으로 규정으로 하나, 우리나라는 4개(적, 황, 녹색화살표, 녹색) 렌즈 교통신호등의 사용을 일반적으로 허용한다. 본 연구는 국제연합 규정 3색 신호등 사용 운전자들의 인지반응 시간과 우리나라 규정 4색 신호등 사용 운전자들의 인지반응 시간이 같지 않음을 확인한다. 피(被)실험 운전자 40명으로부터 총 1,920개 인지반응 시간자료 및 뇌파 자료를 실내시험으로 수집하고 분석하였다. 분석결과 3색 신호등이 4색 신호등보다 신뢰수준 95%에서 (1) 해석 오류가 없고, (2) 인지반응 시간이 빠르며, (3) 인지반응 시간의 표준편차도 적은 것으로 도출되었다. 뇌파 자료 분석결과 3색 신호등은 비서술적 기억 영역(전두엽; 반응 빠름)이 활성화되고, 4색 신호등은 서술적 기억 영역(측두엽; 반응 상대적으로 느림)이 활성화됨을 확인하였다. 이로 우리나라 교통신호등이 교통안전에 유리한 방향으로 발전할 필요가 있음을 제언한다. This study analyzes drivers’ reaction times from the different ways to deliver the meaning of traffic signals based on previous research in Psychology that descriptive and non-descriptive memories in human’s cerebellums play in different roles. The meaning of traffic signal lights is delivered by either the color of light or the combination of those colors. Total 40 subjects asked to react various images of traffic signals and their 1,920 reaction time data were collected and analyzed. Results showed that three-head traffic signals delivering the meaning of traffic signals with its colors provide with less and stable reaction times, at 95% confidence level, compared to the ones of four-head traffic signals delivering with the combination of those. This study suggest a direction to change the types of traffic signal lights based on the findings from this study.
양지웅 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Controlled synthesis of colloidal nanocrystals is one of the most important prerequisites to fully exploit their unique properties for a wide range of their applications. However, the formation mechanism of colloidal nanocrystals is not well studied, yet. In this presentation, I will present my research on the nanocrystal formation. First, I will talk about the II-VI semiconductor magic-sized nanoclusters, which are known as important prenucleation intermediates for nanocrystal synthesis. Second, I will discuss my research on in-situ liquid-phase transmission electron microscopy for studying colloidal nanocrystal formation process. At the end, I will briefly show the structure engineering of colloidal nanocrystal quantum dots for optoelectronic applications such as solar cells and light-emitting diodes.