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Strain-induced carrier mobility modulation in organic semiconductors
전병선,이치호,이상욱 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
We systematically investigated the strain-induced carrier mobility of two representative n-type andp-type organic semiconductors, 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) and N,N0-dioctyl-3,4,9,10-perylenedicarboximide (PTCDI-C8), in order to understand the relationship betweenthe carrier mobility and intermolecular packing configurations. The applied strain to organic semiconductorschanges the intermolecular packing configurations, such as the p–p stacking distance and p–poverlap extent between adjacent p-conjugated molecules. In particular, the in-phase and out-of-phasep–p orbital interactions cause carrier mobility variations and energy level splitting by constructive/bondingand destructive/antibonding interactions between adjacent p-conjugated molecules. Our resultsdemonstrate periodic changes of the strain-induced carrier mobility with respect to the p–p stacking distanceand p–p overlap type, respectively. Furthermore, we propose that the periodic behaviors of carriermobility can be attributed to the alternating phase changes of the molecular orbital interactions underapplied strain. Based on the understanding of the intermolecular interactions and the structure–propertyrelationships, we can provide a strain path for optimal carrier mobility modulation and the developmentof high-performance organic electronic devices.
교량 투신자살을 시도한 환자의 임상적 특징 : 일 대학병원 응급실 기록 조사
전병선,박원명,정영은,송후림,왕희령,우영섭 대한우울조울병학회 2011 우울조울병 Vol.9 No.3
Objectives : Suicide has become the most serious public health problem in Korea. Especially suicide attempt by jumping has resulted in the fatal outcome. In this study, we investigated the demographic and clinical characteristics of those who attempted suicide by jumping from river bridge. Methods : Medical records of patients who were treated at the emergency room following suicide attempt by jumping from river bridge were reviewed. Demographic data and clinical characteristics including clinical diagnosis, family history, past psychiatric treatment,and previous suicide attempts were examined. Results : About half of patients (55.3%) have been diagnosed with major depression and 55.3% of attempters were in drunken state at the time of attempt. Most of suicide attempters (74.5%) were discharged against medical advise from emergency department. The most common reasons for attempted suicide in men was work pressure/business failure (42.9%) and relationship problem with spouse or lover in women (46.2%). Conclusion : Although most of suicide attempter by jumping from river bridge had been diagnosed with psychiatric disorder, refusal of psychiatric treatment was very common. Result may help to inform clinical decision regarding treatment of suicidal patients by jumping. (J of Kor Soc for Dep and Bip Disorders 2011;9:206-211)
계피의 추출조건이 추출액의 무기성분과 물리적성질에 미치는 영향
전병선,김우정,김나미,박채규 한국응용생명화학회 1993 Applied Biological Chemistry (Appl Biol Chem) Vol.36 No.4
The dried cinnamon was extracted with water and 70% ethanol and studied for the several extraction conditions of temperature, time, solvent addition ratio and number of extraction on mineral components and physical properties of the extracts. Mineral components significantly increased as the extraction temperature increased. More than 8 hours of extraction showed a little improving while solvent ratio (V/W) up to 60 times (V/W) significantly increased the mineral components, particularly Cu, Zn, Fe, Na in water extracts and Fe, Mn, K in 70% ethanol extracts. Absorbance at 285 ㎜ decreased as the temperature raised up to the range of 60∼80℃. The Hunter a-value was much affected with extraction conditions and L-value and transmittance were changed similarity while pH was little changed.