[특별 기고] 인공지능시대와 지구경영

이승헌 한국뇌과학연구원 2016 브레인 Vol.57 No.-

유엔 첫 뇌교육 콘퍼런스, 이승헌 협회장 환영사

이승헌 한국뇌과학연구원 2019 브레인 Vol.74 No.-

“21세기 인류의 미래 자산, 뇌 그리고 뇌교육”

이승헌 한국뇌과학연구원 2017 브레인 Vol.64 No.-

소비자의 식생활 라이프스타일이 패밀리레스토랑의 친환경마케팅과 재구매 의도에 미치는 영향

이승헌,이창호,임재문 한국호텔리조트학회 2012 호텔리조트연구 Vol.11 No.1

This study investigated the effect of food-related lifestyle on Friendly environmental marketing and Repurchasing Intention in Family Restaurants. Food-related lifestyle, Friendly environmental marketing, Repurchasing intention, Based on the results of this study, several research hypotheses were tested. The following conclusions are reached. First, a total of 350 questionnaires were distributed and 330 were collected. of these, 318questionnaires were used for data analyses excluding questionnaires with missing values. Second, Eco-friendly campaign, Eco-friendly ingredients, Eco-friendly materials, Eco-friendly sanitation, Recycling in Friendly environmental marketing was significantly effected by health-oriented factor, convenience-oriented factor, economy and safety-oriented factor, tasted-oriented factor in the food-related lifestyle, wheras Eco-friendly materials and Recycling in Friendly environmental marketing was not significantly effected by convenience-oriented factor in the food-related lifestyle and task identity, and also Eco-friendly campaign,Eco-friendly materials was not significantly effected by significantly effected by tasted-oriented factor. Third, as for the relationship of Eco-friendly campaign, Eco-friendly ingredients,Eco-friendly materials, Eco-friendly sanitation, Recycling in Friendly environmental marketing and Repurchase intentions, it was found to be significant, wheras Repurchase intentions was not significantly effected by Eco-friendly materials.

다이나모 특성을 갖춘 파력발전용 PTO 시스템의 수리실험적 연구

이승헌,고상철,박민수 한국해양환경·에너지학회 2020 한국해양환경·에너지학회지 Vol.23 No.4

본 연구에서는 기계적 에너지로 변환된 파력발전장치의 출력을 실시간 확인 가능하도록 다이나모 특성을 갖춘 PTO(Power take off)시스템을 제안하였고 이를 검증하기 위해 2차원 조파수조에서 수리실험을 수행하였다. 새롭게 제안된 PTO시스템은 토크부하 조절용 서보 모터와 기계적 에너지의 계측을 위한 토크센서 및 엔코더로 구성된다. 조파기를 통해 생성된 다양한 규칙파 조건에서 토크부하를 조절해 가면서 파력발전장치의 생산 가능한 전력량 및 발전 효율을 산출하였다. 다양한 입사 파랑조건에 대한 파력발전장치의 거동특성은 시계열로 확보된 토크와 회전수를 기반으로 계산된 기계적 에너지 데이터를 이용하여 분석할 수 있다. 따라서, 본 연구에서 제안된 다이나모 특성을 갖춘 PTO시스템은 파력발전장치의 거동 분석 및 발전 효율 제어에 매우 중요한 데이터를 제공한다. In this study a power take-off (PTO) system with dynamo characteristics that can measure effectively the electric power generated from wave energy converters in real time is suggested. The newly proposed PTO system consists of servo motor to control torque loads and a torque sensor to measure mechanical energy with an encoder. For verification purpose, physical experimental tests are performed in a two-dimensional wave basin. While modulating torque loads under various regular wave conditions, the electric amount and the efficiency of the wave energy converter are estimated. It is well verified that the behavior characteristics of wave energy converters can be analyzed by using the continuous data of mechanical energy obtained from the torque and the rotational speed. Consequently, the proposed PTO system can positively employed to provide data to analyze both the efficiency evaluation and the control system of wave energy converter.

해외 사례로 본 시멘트 산업에서 폐기물 활용의 유용성 -일본과 유럽을 중심으로-

이승헌,Lee, Seung-Heon 한국시멘트협회 2007 시멘트 Vol.176 No.-

Relationships of Coagulation Factor XIII Activity with Cell-Type and Stage of Non-Small Cell Lung Cancer

이승헌,서인범,이은주,허규영,이승룡,이상엽,신철,심재정,인광호,강경호,유세화,김제형 연세대학교의과대학 2013 Yonsei medical journal Vol.54 No.6

Purpose: Factor XIII (FXIII), a thrombin-activated plasma transglutaminase zymogen,is involved in cancer development and progression through a triggered coagulation pathway. The aim of this study was to examine whether FXIII activity levels differed in non-small cell lung cancer (NSCLC) patients according to histological types and TNM stage when compared with healthy subjects. Materials and Methods: Twenty-eight NSCLC patients and 28 normal controls who had been individually age-, gender-, body mass index-, smoking status-, and smoking amount-matched were enrolled: 13 adenocarcinomas, 11 squamous cell carcinomas, and four undifferentiated NSCLCs; four stage I, two stage II, 12 stage III, and 10 stage IV NSCLCs. FXIII activity was measured using fluorescence-based protein arrays. Results: The median FXIII activity level of the NSCLC group [24.2 Loewy U/mL, interquartile range (IQR) 14.9-40.4 Loewy U/mL] was significantly higher than that of the healthy group (17.5 Loewy U/mL, IQR 12.6-26.4 Loewy U/mL) (p=0.01). There were no differences in FXIII activity between adenocarcinoma (median 18.6 Loewy U/mL) and squamous cell carcinoma (median 28.7 Loewy U/mL). NSCLC stage significantly influenced FXIII activity (p=0.02). The FXIII activity of patients with stage III NSCLC (median 27.3 Loewy U/mL, IQR 19.3-40.5 Loewy U/mL) was significantly higher than those of patients with stage I or II (median 14.0 Loewy U/mL, IQR 13.1-23.1 Loewy U/mL, p=0.04). FXIII activity was negatively correlated with aPTT in NSCLC patients (r=-0.38, p=0.04). Conclusion: Patients with advanced-stage NSCLC exhibited higher coagulation FXIII activity than healthy controls and early-stage NSCLC patients.

Low Serum Concentrations of Moxifloxacin, Prothionamide, and Cycloserine on Sputum Conversion in Multi-Drug Resistant TB

이승헌,김동현,서경아,이영민,이현경,김제형,신철,김종률,신재국 연세대학교의과대학 2015 Yonsei medical journal Vol.56 No.4

Purpose: Low serum concentrations of drugs used to treat multi-drug resistant tuberculosis(MDR-TB) have occasionally been associated with treatment failure. We determined the frequencies of low serum concentrations of anti-MDR-TB drugs, and assessed the effects of these concentrations on 2-month sputum conversion. Materials and Methods: The serum levels of moxifloxacin (MF), prothionamide (PTH), and cycloserine (CS) were determined for 89 serum samples by high-pressureliquid chromatography-tandem mass spectrometry. Results: Low serum concentrationsof MF, PTH, and CS below the minimal levels of the normal ranges were 83.3% (20/24), 59.2% (29/49), and 71.2% (47/66), respectively. There were no significant differences between the 2-month sputum conversion group (n=25) and the 2-month sputum non-conversion group (n=4) in median drug concentrations(μg/mL) of MF (1.46 vs. 1.60), PTH (0.91 vs. 0.70), and CS (14.90 vs. 14.90). However, a poor compliance rate was significantly greater in the 2-month sputum non-conversion group (75.0%, 3/4) than in the 2-month sputum conversion group (0%, 0/25) (p=0.001). Conclusion: The frequency of low serum concentrations of anti-MDR-TB drugs was substantial and might not affect the 2-month sputum conversionrate. Larger prospective studies with timely sampling are needed to investigatethe role of therapeutic drug monitoring in MDR-TB.

초점 I - 국내 시멘트 중의 중금속 수준에 대한 고찰

이승헌,Lee, Seung-Heon 한국시멘트협회 2009 시멘트 Vol.183 No.-

고로 서냉슬래그 혼합 시멘트 페이스트의 유동성

이승헌,박설우,유동우,김동현,Lee, Seung-Heun,Park, Seol-Woo,Yoo, Dong-Woo,Kim, Dong-Hyun 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.6

Air-cooled slag showed grindability approximately twice as good as that of water-cooled slag. While the studied water-cooled slag was composed of glass as constituent mineral, the air-cooled slag was mainly composed of melilite. It is assumed that the sulfur in air-cooled slag is mainly in the form of CaS, which is oxidized into $CaS_2O_3$ when in contact with air. $CaS_2O_3$, then, is released mainly as $S_2O{_3}^{2-}$ion when in contact with water. However, the sulfur in water-cooled slag functioned as a constituent of the glass structure, so the$S_2O{_3}^{2-}$ ion was not released even when in contact with water. When no chemical admixture was added, the blended cement of air-cooled slag showed higher fluidity and retention effect than those of the blended cement of the water-cooled slag. It seems that these discrepancies are caused by the initial hydration inhibition effect of cement by the $S_2O{_3}^{2-}$ ion of air-cooled slag. When a superplasticizer is added, the air-cooled slag used more superplasticizer than did the blast furnace slag for the same flow because the air-cooled slag had higher specific surface area due to the presence of micro-pores. Meanwhile, the blended cement of the air-cooled slag showed a greater fluidity retention effect than that of the blended cement of the water-cooled slag. This may be a combined effect of the increased use of superplasticizer and the presence of released $S_2O{_3}^{2-}$ ion; however, further, more detailed studies will need to be conducted.