Electrocaloric properties of K(Ta0.6Nb0.4)O3/SrTiO3 double layer thin films using metal alkoxides

권민수,이성갑,김경민 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.4

In this study, KTN/STO thin films were fabricated on Pt/Ti/SiO2/Si substrate, as a buffer layer, and their structural andelectrical properties were measured according to the number of STO coatings and investigated its applicability to electrocaloricmaterials. KTN/STO thin films showed a polycrystalline KTN XRD peaks with a pyrochlore phase. However, dependence onthe number of STO coatings and pyrochlore phase was not observed. The average grain size was about 80~90 nm, the averagethickness of 6-coated KTN thin film was about 320 nm, and the average thickness of the STO thin film coated once was about50-55 nm. Saturation polarization of K(Ta0.6Nb0.4)O3/SrTiO3 thin films was 24.5 μC/cm2. Electrocaloric temperature change ΔTof K(Ta0.6Nb0.4)O3 thin film showed the maximum value of 3.14 oC at around 76 oC under a high electric field of 332.9 kV/cm.

Machine Learning Study on Nuclear α Decays

권민수,오용석,송영호 한국물리학회 2021 새물리 Vol.71 No.7

The regression process of machine learning is applied to investigate the pattern of alpha decay half-lives of heavy nuclei. By making use of the available experimental data for 164 nuclides, we scrutinize the predictive power of machine learning in the study of nuclear alpha decays within two approaches. In Model (I), we trained neural networks to experimental data of the half-lives of nuclear alpha decays directly while, in Model (II), they are trained to the gap between the experimental data and the predictions of the Viola-Seaborg formula as a theoretical model. The purpose of Model (I) was to verify the applicability of machine learning to nuclear alpha decays, and the motivation of Model (II) was to apply the technique to estimate the uncertainties in the predictions of theoretical models. Out results show that room exists for improving the predictions of empirical models by using machine learning techniques. We also present predictions on unmeasured nuclear alpha decays.

소목 천연 염색에 관한 연구 Ⅰ : 정제 알루미늄 화합물들의 매염효과에 대하여 Mordanting Effect of Purified Aluminum Compounds

권민수,전동원,최인려,김종준 服飾文化學會 2004 服飾文化硏究 Vol.12 No.5

Currently, as mordants, heavy metals are being used in dyeing process in order to improve dye uptake and dye fastness. These chemicals, however, are mostly harmful to human body and the environment along with the pollution by effluent. Traditionally, rice straw ash solution, lime, etc. have been used as mordants in order to improve the effects on dye uptake and color fastness of dyestuffs. The study of natural mordants would, therefore, be vital to the development and succession of our traditional dyeing methods. In this study, as a preliminary step toward the use of rice straw ash solution for the nautral dyeing using Caesalpinia sappan, several aluminum compounds were employed as mordants. When the purified aluminum compounds were used, on the basis of unmordanted cotton fabric, the WS values of the pre-mordanted and simultaneously mordanted fabrics increased by 2 or 3 times, while those of the post-mordanted fabrics decreased.

공시지가를 이용한 아파트 분양가격 예측

권민수,최승배,강창완,김규곤 한국자료분석학회 2017 Journal of the Korean Data Analysis Society Vol.19 No.6

In Korea, real estate accounts for a greater part of household assets comparing to other countries. Accordingly, influential power of and interest in real estate price are great. Because of characteristics of housing market, apartment sales is not happening in every local government and new apartment supply is varied by real estate market status. For this reason, there are problems in calculating and estimating apartment sales price. To calculate average sales price supplementing these difficulties, moving average for 12 years is commonly used. However, this method may introduce smoothing effects and it may not represent the rapidly changing real estate market. The purpose of this study is to develop sub-indicators providing information on apartment sales price by resolving these problems. Additionally, in Korea investors aiming at trading profit make market overheated and end users become the victims of overheated market. Recently, new policy has been announced to resolve this issue and housing for 1 million households will be supplied for 2 years. To respond to this plan, this study tries to estimate sales price of apartment houses by reviewing and classifying lands according to purpose of land use and classification of residential area based on average sales price in Pusan Metropolitan City and average publicly notified individual land price in 16 Gus and Guns and applying regression model to the values. In the analysis, regression model classified as residential area showed excellent predictive power. 부동산이 가계자산에서 차지하는 비중은 우리나라가 다른 나라에 비해 상당히 높다. 그로 인해 부동산가격이 가계경제에 미치는 파급력과 관심도 높다. 분양시장의 특성상 전국의 모든 시군구에서의 분양은 이루어지지 않고, 신규공급물량은 부동산 경기에 따라 차이가 크다. 이러한 이유로 분양가격을 산출하는데 문제점이 존재하고, 이를 보완하여 평균분양가격을 구하기 위해 12개월 이동평균을 이용하고 있다. 그러나 이러한 방법은 평활화현상이 나타나기 때문에 변화하는 부동산 시장을 반영하기에는 어려움이 있다. 따라서 본 연구에서는 이러한 문제점을 보완하여 분양가격에 대한 정보를 제공함으로써 보조지표 개발을 위한 기초자료로 활용하고자 한다. 또한 현재 우리나라에는 전매차익을 노리는 투자자들의 과도한 유입으로 실수요자들의 피해가 커지고 있는 상황이다. 그로 인하여 최근 부동산대책이 새로 발표되었으며, 추후 2년 이내 전국 100만 가구 분양이 계획되어 있다. 이에 대응하여 부산광역시의 평균분양가격과 16개 구․군의 평균공시지가를 기준으로 지목과 주거지의 분류를 통하여 회귀모형을 적용하고 분양가격을 예측한다. 그 결과 주거지로 분류된 회귀모형이 우수한 예측력을 보였다.

한방병원 응급실에 내원한 근골격계 질환 환자 1,485명에 대한 후향적 임상 분석

권민수,김정환,조대현,최지은,한지선,이승민,남동우,최도영 대한침구의학회 2015 대한침구의학회지 Vol.32 No.3

Objectives : The purpose of this study is to review the characteristics of patients who visited the emergency room of a Korean medical hospital with musculoskeletal disorders during the last 5 years and to provide a potential basis for future studies and emergency medical practice. Methods : Patient visit records between May 1st, 2010 and February 28th, 2015 were reviewed and patients with musculoskeletal disorders were included in a retrospective analysis. Results : A total of 5,218 patient visit records were initially reviewed and 1,485 patients (28.46 %) were included in the analysis. S code group was the most frequently diagnosed coding group of Korean Standard Classification of Diseases. The male to female ratio was 1.05:1 and patients in their thirties represented the highest age group. When classified by time of visit, the distribution of patients was similar from 10:00 to 22:59. The most frequently visited day and month were Sunday and September. 879 patients (59.19 %) visited the emergency room within 24 hours from onset of symptoms. The most common symptom site was the low back (45.59 %), followed by ankle (13.94 %) and neck (13.80 %). The most frequently used treatment method was acupuncture (92.32 %), followed by infrared (45.45 %), TENS (30.03 %) and herbal medication (29.02 %). The follow-up and admission rates were 30.24 % and 13.00 % respectively. 343 patients (23.10 %) received Western medical treatment within a day before visiting the emergency room of the Korean medical hospital. Conclusions : This analysis provides the latest information on the characteristics of patients who visited the emergency room of a Korean medical hospital with musculoskeletal disorders. The results can provide the basis for further studies and for other attempts to improve the clinical setting of the emergency room.

高麗代 鞦韆關聯 詩 분석을 통한 鞦韆硏究

권민수 동북아시아문화학회 2018 동북아 문화연구 Vol.1 No.57

The purpose of this study is to study the origin of swinging of the Koryo Dynasty, I have searched the subject of transmission, meaning analysis and space-time of swinging through swinging appeared in the poems of Lee Gyu-bo's ‘Dano Gyun Chucheon Yeohee (端午見鞦韆女戱)’, ‘Hansikil Daeinbulinji’, classical scholars' ‘Hallimbyeolgok (翰林別曲) Chapter 8’, Lee Saek's ‘Swinging’ ‘Dano’ of the 8th book of ‘Mokeun Sigo (牧隱詩藁)’ and Lee Seungin's ‘Dano’, the anthology. As a result of analyzing the literatures, the Hansik day was a Chinese swinging day, and our country swung on the day of Dano festival. The writer of poetry is not a person who swings directly on the swing, but a recorder in the position of the observer. The place where the swings appeared in the Hanlimbyeolgok chapter 8 was Baekjeongdong palace in Gaeseong, the capital city of Goryeo, and the time was Dano day in May 1216. The other city's swing places were in each province. The analysis of the subject of the time and space of the swinging provided the basis for applying the data of the Joseon Dynasty, modern and contemporary. we could find basic momentum to set up basic data to suggest and establish some standards for the swing facility. We know the fact that the viewpoints of swinging are different depending on the times and political positions. There was no extensive study on the swing play in Koryo Dynasty. To make accurate preciseness of the study on the swing, it requires deeper study on time background of literary writers, social custom and ideology, and exegesis and commentary could enables to folklore study on the swing play so far.

고실 내 저농도 젠타마이신 주입술을 통한 메니에르병의 치료

권민수,이성부,안중호,윤태현,정종우 대한이비인후과학회 2009 대한이비인후과학회지 두경부외과학 Vol.52 No.4

Background and Objectives:Intratympanic gentamicin injection is used as one of the treatment modalities for medically intractable Meniere’s disease. But the ideal dosage and concentration of gentamicin were not established in consideration of therapeutic efficacy and the risk of postoperative hearing loss. We analyzed the clinical outcome of low-concentration intratympanic gentamicin injection in patients with Meniere’s disease. And we also tried to find factors anticipating for the response to treatment. Subjects and Method:A retrospective review was conducted on 45 subjects who had been diagnosed as ‘definite’ Meniere’s disease (AAO-HNS, 1995) and had no response to medical treatment over 3 months in our clinic. The concentration of gentamicin was 7 mg/cc, which was very low compared with previous studies. We reviewed postoperative changes on vertigo, tinnitus and hearing by questionnaire and pure tone audiometry. We also analyzed preoperative patients’ characteristics for acquisition of predictive factors of treatment response. Results:Vertigo was completely disappeared in 37 (82%) patients and there was no vertigo improvement in 8 (18%) patients despite multiple injections. Tinnitus was controlled in 11 (24%) patients, and aggravated in 4 (8%) patients. A significant postoperative hearing loss over 10 dB occurred in only 6 (13%) patients. Preoperative patients’ hearing threshold, frequency of vertigo, functional level and finding in electrical test, such as electrocochleogram, were not different regarding treatment response. Conclusion:Low-concentration gentamicin was enough to control vertigo and could reduce the risk of postoperative hearing loss in patients with Meniere’s disease.

구강 미생물군유전체와 구강 질환

권민수 대한이비인후과학회 2017 대한이비인후과학회지 두경부외과학 Vol.60 No.2

Microbiome means a holistic genomic information of microorganism which usually having symbiotic relationships confer benefits to human body. Breaches in the homeostasis between host and microorganism or alterations of the microbiome are well-known risk factors promoting human diseases. Oral cavity has hundreds of microbes and demonstrates chronic inflammatory conditions by interrelations among microorganisms, foreign bodies, alcohol, and smoking. Oral microbiome also demonstrates a growing evidence of its implication in the etiology of oral diseases including cancer and other systemic diseases. In this review paper, I would introduce to the associated human diseases with oral microbiome and the mechanism how changes in the oral microbiome with its microenvironment leads to the host diseases. And I would also suggest a new research field in otorhinolaryngology connected to oral microbiome. Korean J Otorhinolaryngol-Head Neck Surg 2017;60(2):49-54

고려시대 鞦韆 양상-高麗史․高麗史節要 중심으로-

권민수 한국민속학회 2018 韓國民俗學 Vol.68 No.-

In order to study swings of Koryeo dynasty, I have searched the space time of swinging and the principal inheritors and the ruling prohibiting swinging in the History of Koryeo Dynasty and Important Koryeo History, written records of official history publishing. As a result of reviewing the appearance of swinging in Koryeo Dynasty, it appears that actual dates of space time the swinging was played were Dano Day, but seeing King Woo swang in October it seems swinging could be played on dates other than Dano Day and the venues appeared to have been inside the palace and in the garden of Choe I’s house located in Ganghwa Island. Though the principal inheritors were the initiator of the functions but we came to find that the viewpoints were different depending upon who was the recorder. This has come to have appeared that the records were arranged as per the viewpoints of the officials of Joseon Dynasty such as Kim Jong Suh and Jung In Jee who would commend the justification of the opening of Joseon Dynasty. As per the prohibiting rulings of swinging, there were absolutely no records of prohibition of swinging nor “lifting the prohibiting rulings for swinging” either in the History of Koryeo or in the Important Koryeo History books during the prohibition period. However, the fact that there were three times ‘prohibition of swingings’ makes us acknowledge that swinging was prevalent throughout all Koryeo territory. 고려시대 鞦韆을 연구하기 위하여 우리나라의 史書 문헌기록인 『高麗史』와 『高麗史節要』에 나타나는 그네뛰기의 時空間과 傳承主體, 그네뛰기의 禁止令을 살펴보았다. 고려시대의 추천의 양상을 살펴 본 결과, 그네뛰기의 시간과 장소에서 그네를 실제로 뛴 날이 단옷날로 나타나고 있으나 10월에 禑王이 그네를 뛴 것으로 보아 단오가 아닌 날에도 그네를 뛸 수 있었다. 장소는 궁중과 강화도 崔怡집 정원으로 나타났다. 전승주체는 행사의 주최자이지만 그 기록자에 의하여 그네뛰기에 대한 시각을 달리하는 것을 알 수 있었다. 이는 조선의 개국에 대한 당위성을 주장하기 위한 조선시대의 김종서, 정인지 등 관료들의 시각으로 정리 되었다는 것으로 나타났다. 그네뛰기 금지령은 그네뛰기의 금지와 금지 기간 동안에 『高麗史』나 『高麗史節要』의 문헌에 ‘그네뛰기 금지에 대한 해제’의 기록이 전혀 없었다. 그럼에도 불구하고 3번의 ‘그네뛰기금지’를 시킨 점은 그네뛰기가 고려의 전 지역에서 성행하고 있었음을 알 수 있다.

Differential Modulatory Effects of Cholera Toxin and Pertussis Toxin on Pain Behavior Induced by TNF-α, Interleukin-1β and Interferon-γ Injected Intrathecally

권민수,Eon-Jeong Shim,서영준,Seong-Soo Choi,Jin-Young Lee,Han-Kyu Lee,서홍원 대한약학회 2005 Archives of Pharmacal Research Vol.28 No.5

The present study was designed to characterize the possible roles of spinally located cholera toxin (CTX)- and pertussis toxin (PTX)-sensitive G-proteins in pro-inflammatory cytokine induced pain behaviors. Intrathecal injection of tumor necrosis factor-a (TNF-α; 100 pg), interleukin- 1β (IL-1β; 100 pg) and interferon-γ (INF-γ; 100 pg) showed pain behavior. Intrathecal pretreatment with CTX (0.05, 0.1 and 0.5 mg) attenuated pain behavior induced by TNF-α and INF-γ administered intrathecally. But intrathecal pretreatment with CTX (0.05, 0.1 and 0.5 µg) did not attenuate pain behavior induced by IL-1β. On the other hand, intrathecal pretreatment with PTX further increased the pain behavior induced by TNF-α and IL-1β administered intrathecally, especially at the dose of 0.5 µg. But intrathecal pretreatment with PTX did not affect pain behavior induced by INF-γ.Our results suggest that, at the spinal cord level, CTX- and PTX-sensitive G-proteins appear to play important roles in modulating pain behavior induced by pro-inflammatory cytokines administered spinally. Furthermore, TNF-α, IL-1β and INF-γ administered spinally appear to produce pain behavior by different mechanisms.