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목질바이오매스의 초임계수 처리에 의한 리그닌의 화학적 변환
이수민(Lee, Soo-Min),이오규(Lee, Oh-Kyu),최석환(Choi, Seok-Hwan),최준원(Choi, Joon-Weon),최돈하(Choi, Don-Ha) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
The modified supercritical water treatment method is adopted for hydrolysis of wood powder, Populus albatimesglandulosa. This modified method is containing 0.05% HCl or HNO₃ as acid catalyst. The supercritical water treatment(SCW) was performed for 1 min. with 350?C, 380?C, 400?C and 425?C, respectively, under 230 pm 10 atm using continuous flow system. When acid was added to powder prepared for SCW treatment, the yields of monomeric sugars were significantly increased. The lignin remained after supercritical treatment was applied to gel permeation chromatography(GPC) for molecular weight distribution analysis. Compared to the lignin produced from SCW treatment without acid catalyst, the average molecular weight of lignin compounds treated with acid was clearly decreased. Particularly, Mn/Mw ratio is decreased. This result shows supercritical water treatment of wood powder can change the molecular weight of lignin to small size. However, it is necessary to be further studied for exactly characterizing the lignin produced from supercritical water treatment.
사상인 체질병증 험위증(險危證) 중 악성 종양으로 유발될 수 있는 증(證)에 대한 고찰
이수민,박소라,이수경,Lee, Soo-Min,Park, So-Ra,Lee, Soo-Kyung 사상체질의학회 2015 사상체질의학회지 Vol.27 No.3
Objectives The purpose of study was to identify cancer related symptoms of Sasang Constitution based on the classic of Sasang Constitutional Medicine (SCM). Methods The bibliographical study was performed with "Dongyisoosebowon-Shinchukbon(東醫壽世保元 辛丑本)", Dongyisoosebowon-Sasangchobongwon(東醫壽世保元 四象草本券), "Cancer", and several review articles. The perspective on severe illness in SCM was investigated. And 'the critical state' of constitutional symptoms based on "Dongyisoosebowon" was identified as cancer related symptoms. Results and Conclusions The perspective on severe illness of SCM was focused on the human being itself, compared with symptom based traditional Chinese medicine. The preservation of requisite energy (保命之主) was a vital factor of longevity to maintain healthy status and the classification of severity of disease. And critical state was an important indicator to control severe illness. Regarding cancer related symptoms in SCM, Janggwol(臟厥), Eumsung-gyeokyang(陰盛隔陽證), Janggyeol(藏結證) of Soeumin symptoms, Hwangdal(黃疸), Haso(下消), Eumheo-oyel(陰虛午熱證), Gochang, Tohyul(吐血) of Soyangin's symptoms, Joyeol(燥熱證), Bokchang-bujong(腹脹浮腫) of Taeeumin's symptoms, and Eolgyek of Taeyangin's symptoms could be shown the association with cancer. According to the prognosis on disease severity, regimens of daily life, behavior modifications as well as medications were also emphasized with great importance to control severe illness in SCM. These holistic approach for controlling severe illness in SCM could lead to the improvement of treatment outcome.
전이된 담도암 환자의 패혈증을 한다열소탕 및 우담과 항생제를 병행하여 치료한 환자 1례
이수민,최성헌,송안나,이지영,채진,정의홍,이수경,Lee, Soo-Min,Choi, Seong-Heon,Song, An-Na,Lee, Ji-Young,Chae, Jin,Jung, Eu-Hong,Lee, Soo-Kyung 사상체질의학회 2013 사상체질의학회지 Vol.25 No.4
Objectives Despite the treatment with antibiotics, patients with sepsis has a high mortality (80%) in the underlying disease group. The aim of this study was to report the improvement of septic condition of the cholangiocarcinoma patient after the treatment with Handayeolso-tang, Fel Tauri, and antibiotics. Methods We retrospectively reviewed the medical records. The patient's subjective symptoms such as chilling and abdominal pain were evaluated by NRS and the performance status was evaluated by ECOG. This case was literally compared with relevant published studies on prognosis of sepsis. Results Despite poor prognostic factor(MEDS score 18), the patient's symptoms such as fever, chilling, abdominal pain, and diarrhea and ECOG(Eastern Cooperative Oncology Group) improved. The patient was hemodynamically stabilized on 3rd day from the treatment, and her laboratory test results were normalized on 7th day. Conclusions A female patient of metastatic cholangiocarcinoma came to the hospital for cholangitis, later causing septic shock. Both her symptoms and laboratory tests showed significant improvement after the treatment of antibiotics, Handayeolso-tang and Fel Tauri. To our knowledge, this is the first case reporting the synergistic combination of Korean oriental medicine and Western medicine approaching to sepsis.
단신 : 고에너지밀도 펠릿제조를 위한 목재칩 반탄화 특성
이재원 ( Jae Won Lee ),김영훈 ( Young Hun Kim ),이수민 ( Soo Min Lee ),이형우 ( Hyoung Woo Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.2
본 연구에서는 소나무 혼합수종을 이용하여 에너지 밀도 증가, 균일한 품질의 바이오매스 제공을 위해 무산소 조건에서 반탄화를 실시하였다. 반응온도는 240, 260, 280˚C로 하여 30분 동안 반응시킨 후반탄화 바이오매스 특성을 조사하였다. 침엽수혼합수종의 반탄화는 무처리 바이오매스와 비교하여 발열량이 향상되었음을 확인하였다. 반탄화 온도가 증가할수록 반탄화된 바이오매스의 탄소함량은 최대 46.55%에서 55.73%로 증가하였다. 반면 수소와 산소의 함 량은 각각 6.00%에서 5.87%, 30.55%에서 27.21%로 감소하였다. 반탄화 과정에서 주로 헤미셀룰로오스와 휘발성 물 질이 제거되었다. 280˚C에서 30분 동안 반응하였을 때 최대 발열량 5,132 kcal/kg을 나타냈다. 이것은 처리전 바이오 매스의 발열량 보다 약 13% 증가하였음을 나타내고 있다. 중량감소율과 에너지수율을 고려하여 비교한 결과 240˚C 에서 30분 동안 처리하였을 때 효과적인 반탄화가 이루어졌다. In this study, torrefaction of mixed softwood chips under anoxic condition was performed to improve energy density and maintain consistent quality of biomass. Characteristics of torrefied biomass depending on reaction time (30 min) and temperature (240, 260, 280˚C) were investigated. Torrefaction of mixed softwood chips significantly improved the heating value compared to that of untreated biomass. As the torrefaction temperature was increased, the carbon content of torrefied biomass increased from 46.55 to 55.73%, while its hydrogen and oxygen contents decreased from 6.00 to 5.87% and from 30.55 to 27.21%, respectively. Most of hemicelluloses and volatile compounds were removed during torrefaction. The highest heating value was 5132 kcal/kg when torrefaction was performed at 280˚C for 30 min. It implied that the heating value increased by 13% compared to that of original biomass. However, the condition of effective torrefaction was at 240˚C for 30 min when weight loss and energy yield was considered.
COVID-19 상황에서 대학생이 경험하는 경제적 어려움이 불안에 미치는 영향: 가족지지와 가족동거의 다중가산조절효과를 중심으로
이수민(Soo-Min Lee),조성봉(Sung-Bong Cho) 한국가족치료학회 2021 가족과 가족치료 Vol.29 No.4
본 연구는 대학생들이 COVID-19 팬데믹 상황에서 경험하는 경제적 어려움과 그로 인한 불안 간 관계에서 가족지지와 가족과의 동거여부의 조절효과를 확인하였다. 이를 위해 경상북도에 소재한 대학교의 재학생들을 대상으로 편의표집 방법으로 설문조사를 실시하여 자료를 수집하였고, 총 511명의 응답지를 분석에 사용하였다. 주요 결과들은 다음과 같다. 첫째, 대학생이 경험하는 경제적인 어려움은 그들의 불안의 수준에 정적인 영향을 미치는 것으로 나타났다. 둘째, 대학생이 지각하는 가족지지는 불안에 부적 영향을 미치고, 가족과의 동거는 불안에 정적 영향을 미치는 것으로 나타났다. 셋째, 경제적인 어려움과 불안과의 관계에서 가족지지와 가족과의 동거는 각각 유의한 부적, 정적 조절효과를 갖는 것으로 나타나 경제적 어려움과 불안 간의 관계를 각각 완충 및 강화하는 다중가산조절효과를 보이는 것으로 확인되었다. 이같은 결과는 대학생들이 가족과 동거하는 것과 가족의 지지를 받는 것의 영향이 서로 다름을 나타내며 경제적으로 어려운 상황에서 단순히 가족과 동거하는 것보다 가족지지의 경험이 어떠한가를 이해하는 것이 중요함을 의미한다. 경제적 어려움이 불안에 미치는 영향이 가족과의 동거여부와 가족지지를 각각 통제하였을 때 어떻게 달라지는지에 대해서는 논의를 통해 구체적으로 제시하였다. Objectives: This study examines how college students’ economic hardship, as well as perceived family support and living arrangement (living with family or not) are associated with their anxiety during the COVID-19 pandemic. Possible moderating effects of family support and living arrangement on the association between economic hardship and anxiety are also examined. Methods: Data were collected by online survey, and a total of 511 responses from college students were used for analysis. Results: Hierarchical linear regression suggested that (1) college students’ economic hardship was positively associated with their anxiety; (2) perceived family support was negatively associated with anxiety, while living with family was positively associated; (3) perceived family support and living with family had significant negative and positive moderating effects, respectively, on the association between economic hardship and anxiety. Conclusion: Results suggest multiple additive moderating effects of family support and living with family, buffering, and worsening the influence of economic hardship on anxiety among college students. Further discussion about interpretation and implications of the results are provided.
이수민 ( Soo-min Lee ),김태현 ( Tae-hyun Kim ),조영무 ( Young-moo Jo ),김기범 ( Ki Beom Kim ),이종흔 ( Jong-heun Lee ) 한국센서학회 2021 센서학회지 Vol.30 No.2
In this study, pure and Co<sub>3</sub>O<sub>4</sub>/CoFe<sub>2</sub>O<sub>4</sub>-loaded Indium oxide (In<sub>2</sub>O<sub>3</sub>) nanofibers were synthesized by the electrospinning of an Indium/Polyvinylpyrrolidone precursor solution containing cobalt and iron bimetallic zeolitic imidazolate frameworks and subsequent heat treatment. The ethanol, toluene, p-xylene, benzene, carbon monodxide, and hydrogen gas sensing characteristics of the solution were measured at 250-400 ℃. 0.5 at%-Co<sub>3</sub>O<sub>4</sub>/CoFe<sub>2</sub>O<sub>4</sub>-loaded In<sub>2</sub>O<sub>3</sub> nanofibers exhibited extreme response (resistance ratio - 1) to 5 ppm of ethanol (210.5) at 250 ℃ and excellent selectivity over the interfering gases. In contrast, pure In<sub>2</sub>O<sub>3</sub> nanofibers exhibited relatively low responses to all the analyte gases and low selectivity above 250-400 ℃. The superior response and selectivity toward ethanol is explained by the catalytic roles of Co<sub>3</sub>O<sub>4</sub> and CoFe<sub>2</sub>O<sub>4</sub> in gas sensing reaction and the electronic sensitization induced by the formation of p (Co<sub>3</sub>O<sub>4</sub>/CoFe<sub>2</sub>O<sub>4</sub>)-n (In<sub>2</sub>O<sub>3</sub>) junctions.