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김민종,한영열 한국전자파학회 2002 한국전자파학회논문지 Vol.13 No.8
In this paper we derive the probability density function of the phase error of the received signal over Rician fading channel and verify its propriety as the probability density function using the zeroth moment. In general, for the error probability over fading channel we compute the error probability in the first place when it is only AWGN, and then we get the final result by averaging the first result and the probability density function of the corresponding fading channel. In this paper, however, we compute the error probability by double integration after the probability density function over fading channel is computed. 본 논문에서는 라이시안(Rician) 감쇄가 존재하는 채널 환경에서 협대역 잡음이 더하여진 경우에 대역 여파기를 통과한 수신신호의 위상오류에 대한 확률 밀도 함수를 유도하고 0차 모먼트가 1이 됨을 보임으로써 확률밀도 함수로서의 타당성을 검증한다. 일반적으로 감쇄 환경에서 시스템의 오류 확률은 먼저 가산성 백색 가우시안 잡음(AWGN : Additive White Gaussian Noise)만이 존재할 때의 오류 확률을 구한 후, 그 결과 식을 해당 감쇄에 대한 확률 밀도 함수로 평균을 취하여 구한다. 하지만 본 논문에서는 감쇄 환경에서의 수신 신호에 대한 위상 오류식을 구한 다음, 그 식을 한번의 이중 적분을 취함으로써 오류 확률을 구하게 된다.
揚雄의 문학이론과 그 영향 : 賦의 諷諫 功能에 관한 前後 反轉전을 중심으로
김민종 한국중국학회 2003 중국학보 Vol.47 No.-
揚雄是西漢時期著名的哲學家和辭賦家. 他年少時愛好辭賦, 潛心學習司馬相如的作品, 後來被人推薦給漢成帝, 成爲宮庭的文學侍從. 揚雄對賦之諷諫功能的認識, 可以劃分爲早年和後期兩個階段. 在年靑時代, 他愛好辭賦, 十分尊崇司馬相如. 他自己也對辭賦寫作進行了認眞刻苦的硏習, 傾注了大量的心血, 終於成爲能與司馬相如相伯仲的辭賦大家. 對賦之諷諫功能, 其態度也頗爲支持, 在創作中注意發揮諷諭勸戒作用. 但到了晩期, 揚雄深感靡麗的辭賦不能達到他所企求的有益世用的諷諫功能, 甚至起相反的作用. 於是一反往常, 對賦之諷諫功能轉而進行了嚴勵的批評. 我認爲揚雄否定賦之諷諫功能, 其原因除了諷諫的實際效果不佳之外, 更直接的是他對立身揚名之願望的挫折. 揚雄透過賦之創作, 雖然身爲皇帝的侍從之臣, 但終身不得大官. 反而當日的賦家, 地位低, 在皇帝的眼裏, 只是宮庭俳優一類人物. 由於這些原因, 他對於賦作進行了反思, 結果"輟不復爲". 本文試想在探討揚雄對賦之諷諫功能的反轉原因, 以期比較全面地描繪漢代賦論之論爭與發展樣相.
Fe-29%Ni-17%Co 저열팽창 합금의 피로 특성에 미치는 알파상의 영향
김민종,권진한,조규상,이기안,Kim, Min-Jong,Gwon, Jin-Han,Cho, Kyu-Sang,Lee, Kee-Ahn 한국재료학회 2014 한국재료학회지 Vol.24 No.9
The effect of alpha phase on the fatigue properties of Fe-29%Ni-17%Co low thermal expansion alloy was investigated. Two kinds of alloys (Base alloy and Alpha alloy) were prepared by controlling the minimal alloy composition. Microstructure observation, tensile, high-cycle fatigue, and low-cycle fatigue results were measured in this study. The Base alloy microstructure showed typical austenite ${\gamma}$ phase. Alpha alloy represented the dispersed phase in the austenite ${\gamma}$ matrix. As a result of tensile testing, Alpha alloy was found to have higher strengths (Y.S. & T.S.) and lower elongation compared to those of the Base alloy. High cycle fatigue results showed that Alpha alloy had a higher fatigue limit (360MPa) than that (330MPa) of the Base alloy. The Alpha alloy exhibited the superior high cycle fatigue property in all of the fatigue stress conditions. SEM fractography results showed that the alpha phase could act to effectively retard both fatigue crack initiation and crack propagation. In the case of low-cycle fatigue, the Base alloy had longer fatigue life in the high plastic strain amplitude region and the Alpha alloy showed better fatigue property only in the low plastic strain amplitude region. The fatigue deformation behavior of the Fe-29%Ni-17%Co alloy was also discussed as related with its microstructure.
김민종,유준상,고상백,박종구,Kim, Min-Jong,Yoo, Jun-Sang,Koh, Sang-Baek,Park, Jong-Ku 사상체질의학회 2009 사상체질의학회지 Vol.21 No.1
1. Objectives This study was to designed investigate the relationship between hypertension and its risk factors and the prevalence of hypertension according to Sasang Constitution. 2. Methods Five hundred and twenty six people were subjects out of 666 people, over 40 years old, who participated in the community-based cohort in Wonju, South Korea from July 2nd to August 30th in 2006. Hypertensive group was 263 peoples and normal group was 263 people, selected randomly among non hypertensive people who had same age and sex with hypertensive groups. Sasang Constitutional Diagnosis was carried out using PSSC(Phonetic System of Sasang Constitution), face and tongue photos and a checkup list. Risk factors from blood samples, physical measurements and social indices were analyzed using SPSS. 3. Results The prevalence of hypertension in Taeeumin was 63.1%(N=166), that of Soeumin was 22.4%(N=59) and that of Soyangin was 14.4%(N= 38). Considering risk factors of hypertension, there weren't any differences between two groups in social support indices and Framingham type A score. But scores of Soeumin's and Soyangin's were significantly high compared with that of Taeeumin in female normal group. There were significantly high results in Adiponectin of Soeumin's and HDL-cholesterol of female Soyangin's and HOMA-IR of Taeeumin's than any other groups. Crude OR of Taeeumin was 2.18 as compared with that of Soeumin in terms of risk of hypertension, and OR of Taeeumin was 2.02 as compared with that of Soeumin after drinking, smoking, total cholesterol, fasting blood sugar and HOMA-IR were adjusted. But after BMI was adjusted there wasn't a significance between Soeumin and Taeeumin and the OR of more than 25 was 2.42 as compared with that of less than 23 in BMI. 4. Conclusions Sasang Constitution is thought to be the reasonable variable to control hypertension in terms of prevention, treatment and regimen. And constitution is needed as a good variable to make a cohort study concerning chronic diseases, especially hypertension.