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비인두암 치료 후 재발로 오인된 사골동-접형동 기질화 혈종 1예
박민혜(Min Hae Park),김희정(Hee Jung Kim),홍상덕(Sang Duk Hong) 대한두개저학회 2020 대한두개저학회지 Vol.15 No.1
Organized hematoma is a rare non-neoplastic lesion causing bone destruction and obstruction. The exact mechanism remains unclear; it is known that tumors develop well when bleeding is poorly ventilated or drained. Compared to the maxillary sinus, the sphenoid sinus or ethmoid sinus have insufficient cavity to develop the organized hematoma. We report a case of 45-year-old male with organized hematoma in sphenoid and ethmoid sinus which was mimicking a malignant tumor. The patient had radiation therapy due to nasopharyngeal cancer. The computed tomography scan revealed an expansile neoplasm of ethmoid and sphenoid sinus, so we speculated it as recurrence of tumor. However, endoscopic deep biopsy proved that it was organized hematoma. Even if the tumor occurs in a relatively rare location, it is necessary to distinguish between malignant and benign tumor in consideration of the patient’s history and clinical features.
식각공정용 가스방전에서 이온 및 활성종 밀도의 전자밀도 및 온도 의존성에 대한 수치해석적 분석
안충기,박민혜,손형민,신우형,권득철,유신재,김정형,윤남식,An, Choong-Gi,Park, Min-Hae,Son, Hyung-Min,Shin, Woo-Hyung,Kwon, Deuk-Chul,You, Shin-Jae,Kim, Jung-Hyung,Yoon, Nam-Sik 한국진공학회 2011 Applied Science and Convergence Technology Vol.20 No.6
식각공정에 주로 사용되는 $Cl_2$/Ar, $CF_4$, $CF_4/O_2$, $CF_4/H_2$, $C_2F_6$, $C_4F_8$, 그리고 $SF_6$ 가스 방전에서 이온, 중성종 및 활성종 밀도의 전자밀도와 온도에 대한 의존성을 수치해석적으로 분석하였다. 이온, 중성종 및 활성종 밀도에 대한 공간평균 유체방정식을 정상상태로 가정하여 상대적으로 측정이 용이한 전자밀도와 온도에 대한 식으로 표현하였고, 이 식을 수치해석적인 방법으로 풀었다. 계산에 사용된 반응계수들은 여러 문헌에서 수집되거나 산란단면적으로부터 계산되었고, 같은 반응에 대해 다른 값을 보일 경우, 계산 결과를 실험 결과와 비교하여 높은 일치도를 보이는 값이 선택되었다. Dependence of radical and ion density on electron density and temperature is numerically investigated for $Cl_2$/Ar, $CF_4$, $CF_4/O_2$, $CF_4/H_2$, $C_2F_6$, $C_4F_8$ and $SF_6$ discharges which are widely used for etching process. We derived a governing equation set for radical and ion densities as functions of the electron density and temperature, which are easier to measure relatively, from continuity equations by assuming steady state condition. Used rate coefficients of reactions in numerical calculations are directly produced from collisional cross sections or collected from various papers. If the rate coefficients have different values for a same reaction, calculation results were compared with experimental results. Then, we selected rate coefficients which show better agreement with the experimental results.