Ceria 촉매상에서 탈수가 DMC 합성에 미치는 영향

유지인(Jiin You),우제민(Je-Min Woo),김현욱(Hyunuk Kim),박영철(Young Cheol Park),박종호(Jong-Ho Park),문종호(Jong-Ho Moon) 한국청정기술학회 2016 청정기술 Vol.22 No.3

DMC (dimethyl carbonate)를 합성하기 위하여 ceria 계열의 촉매를 이용하여 반응 조건을 확인하는 연구를 수행하였다. 촉매의 합성 조건을 찾기 위하여 소성 온도와 Cu(II)의 함량을 조절하였고, 완성된 촉매는 NH3-TPD를 이용하여 반응성(산점)을 확인하였다. DMC를 합성하기 위하여, 산화카르보닐화법(oxidative carbonylation, 일산화탄소와 산소를 메탄올과 반응)과 직접합성법(direct synthesis, 이산화탄소를 메탄올과 반응)을 적용하였다. 르샤틀리에의 원리에 따라, 반응 중 생성되는 물을 제거하여 반응성(메탄올 전환율)을 향상시키고자 하였으며, 이를 위해 화학적 탈수제(chemical dehydration agent)인 2-cyanopyridine를 사용하였다. 화학적 탈수 반응을 산화카르보닐화법에 적용하였을 경우, 메탄올 전환율은 15.1%에서 38.7%, DMC 선택도는 0%에서 98.8%까지 향상되었다. 이를 직접합성법에 적용하였을 경우, 메탄올 전환율은 1.0%에서 77.8%, DMC 선택도는 41.2%에서 100.0%까지 향상되었다. In this study, ceria- based catalysts were prepared for dimethyl carbonate (DMC) synthesis and reaction conditions were evaluated for finding the optimal reaction route. In order to find optimal catalysts for DMC synthesis, calcination temperature and Cu(II) impregnation amount were evaluated. The oxidative carbonylation using methanol, carbon monoxide and oxygen and the direct synthesis using methanol and carbon dioxide were introduced for producing DMC. Following the law of Le Chatelier, the dehydration reaction was applied for enhancing the reactivity (methanol conversion) as removing water during the reaction. 2-cyanopyridine, as a chemical dehydration agent, was used. In the case of the oxidative carbonylation, methanol conversion rate increased from 15.1% to 38.7% and the DMC selectivity increased from 0% to 98.8%. In the case of the direct synthesis, methanol conversion rate increased from 1.0% to 77.8% and the DMC selectivity increased from 41.2% to 100.0%.

사전 학습 모델 기반의 리뷰 감성분석 및 핵심 키워드 추출 프레임워크 : 한국어 호텔 리뷰 데이터 수집부터 시각화까지

박지인(Jiin Park),박지원(Jiwon Park),김미숙(Misuk Kim) 한국HCI학회 2023 한국HCI학회 학술대회 Vol.2023 No.2

기존 리뷰 시스템은 서비스의 품질과 소비자의 만족도를 보여주기 위해 평균 평점을 이용하였다. 하지만, 최근 들어 평점이 실제 만족도보다 높게 평가되는 현상인 ‘평점 인플레’ 로 인해, 평점 시스템의 문제점이 발견되었다. 본 연구에서는 평점 인플레를 해결하기 위해, 호텔 리뷰 데이터에 언어 모델을 이용하여 리뷰의 감성을 분류하고, 분류 결과를 시각화하였다. 또한, 키워드 추출방법론을 사용하여 키워드 목록을 만들고, 리뷰와 키워드 사이에 코사인 유사도가 높은 키워드를 핵심 키워드로 하여 시각화 하는 프레임워크를 제안하였다. 본 연구 결과는 평점 인플레로 인해 의미를 잃고 있는 리뷰 평점시스템이 본 기능을 되찾을 수 있을 것으로 기대한다.

Clinical features and survival in lung cancer patients with rheumatoid arthritis

( Dong Won Park ),( Jiin Choi ),( Kyung-il Han ),( Min Ju Jo ),( Sung Jun Chung ),( Yoomi Yeo ),( Tai Sun Park ),( Hyun Lee ),( Ji-yong Moon ),( Sang-heon Kim ),( Tae- Hyung Kim ),( Ho Joo Yoon ),( Ja 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-

Background: There is a significant association between the incidence of lung cancer (LC) and rheumatoid arthritis (RA). Methods: A total of 53 LC patients with RA who were admitted to Hanyang University Seoul and Guri Hospital, South Korea, between 2005 Aug to 2019 Mar were included in the study. As smoking is a shared risk for both LC and RA, we compared the clinicopathologic characteristics of LC with RA according to smoking status, aiming to explore the role of smoking in RA-associated LC. Cox proportional hazards regression analyses were used to estimate hazard ratios and determine risk factors for predicting mortality. Results: Of the enrolled patients, 45.3% were female and more than half (60.4%) were active or former smokers. RA-interstitial lung disease (RA-ILD) was observed in 19 patients (35.8%) with RA, including eight with usual interstitial pneumonia (UIP) and 11 with non-specific interstitial pneumonia (NSIP). Overall, smoking patients were mainly men (87.5%) and had a higher Charlson comorbidity index (CCI) compared to non-smoking patients. The predominant histologic lung cancer subtype was squamous cell carcinoma (50.0%) in smoking patients, however, a larger proportion of adenocarcinoma (76.2%) was noted in non-smoking patients (P < 0.0001). More smoking patients had RA-ILD (46.9%) than non-smoking patients (19.1%, P = 0.039). In the multivariable analysis, an Eastern Cooperative Oncology Group (ECOG) performance score (PS) of ≥ 2 (HR: 4.51, P = 0.0113) and a diagnosis of stage IV cancer (HR: 9.33, P < 0.0001) demonstrated significant associations with mortality. However, RA-ILD and smoking history did not show an independent association with poor outcome. Conclusions: Among LC patients with RA, smoking was significantly associated with males, a higher CCI, and a higher prevalence of RA-ILD. We also demonstrated that an ECOG PS ≥ 2 and diagnosis of stage IV were significant risk factors for predicting mortality.

Clinical Significance of Advanced Lung Cancer Inflammation Index in Limited Disease Small Cell Lung Cancer Patients Treated with Chemoradiotherapy

( Dong Won Park ),( Jiin Choi ),( Seung Hyeun Lee ),( Boksoon Chang ),( Sung Jun Chung ),( Tai Sun Park ),( Hyun Lee ),( Ji-yong Moon ),( Sang-heon Kim ),( Tae-hyung Kim ),( Ho Joo Yoon ),( Jang Won S 대한결핵 및 호흡기학회 2021 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.129 No.-

Background This present study aimed to investigate the prognostic significance of the Advanced Lung Cancer Inflammation Index (ALI) in peripheral blood of limited disease small-cell lung cancer (LD-SCLC) treated with chemoradiotherapy. Methods We included 87 consecutive LD-SCLC patients treated from 2005 to 2019 in South Korea. All patients were treated with definite chemoradiotherapy. Chemotherapy was etoposide combined with either carboplatin or cisplatin given mainly concomitantly with radiotherapy. ALI was calculated as the formula: body mass index x serum albumin/neutrophil-lymphocyte ratio (NLR). Survival curves were generated using the Kaplan-Meier method. Cox proportional hazards regression analyses were used to estimate hazard ratios (HRs) and determine risk factors predicting mortality. Results We classified 38 patients as high ALI (ALI ≥ 44.3) and 48 as low ALI group (ALI < 44.3). Compared with the low ALI group, patients in the high ALI group had a longer overall survival (OS) time. On multivariate analysis, performance status (P = 0.0222), prophylactic cranial irradiation (P = 0.0007), and ALI (P = 0.0044) were all independent prognostic factors for OS. Conclusions The Results of this study demonstrated that high ALI was significantly associated with better OS in LD-SCLC patients treated with chemoradiotherapy. For the initial evaluation of patients with LD-SCLC, pre-treatment ALI could predict the patients with good prognosis and be a useful prognostic marker in clinical practice.

사과 주산지 변화 모형 추정

박해원(Haewon Park),오상헌(Sangheon Oh),소남호(Namho So),박지인(Jiin Park),김근아(Geunah Kim),정재원(Jaewon Jeong) 한국원예학회 2022 한국원예학회 학술발표요지 Vol.2022 No.5

Analysis on Residents Using Behavior of the Community Facilities for Community Activation in Hongdong Rural Area

Jiin Jung,Kyoung-Ok Park 한국주거학회 2015 한국주거학회 국제학술대회논문집 Vol.2015 No.4

한국 성인의 안정시 심박수와 우울과의 관계: 한국 국민건강영양조사(2015∼2018년)를 바탕으로

류지인(Jiin Ryu),박동혁(Dong-Hyuk Park),민지희(Ji-Hee Min),정안숙(Ansuk Jeong),송인한(In Han Song),전용관(Justin Y. Jeon) 대한스트레스학회 2021 스트레스硏究 Vol.29 No.3

본 연구의 목적은 한국 성인들을 대상으로 안정시 심박수와 우울과의 관계를 규명하는 것이다. 본 연구는 2015년부터 2018년까지 시행된 국민건강영양조사 자료를 이용하여 만19세 이상 성인 총 14,021명을 대상으로 하였다. 안정시 심박수는 10 bpm (beat per minute) 단위로 다섯 그룹으로 나누었으며 우울과의 관계를 분석하기 위해 공변량과 혼란변수를 통제하고 로지스틱 회귀분석을 실시하였다. 분석 결과, 안정시 심박수가 60 bpm 미만인 그룹과 비교하였을 때 80~89 bpm 또는 90 bpm 이상 그룹에서 우울 위험률이 통계적으로 유의하게 증가하였다(p<.05). 따라서, 본 연구를 통해 안정시 심박수는 우울과 유의한 관련성이 있음을 확인하였다. Background: The purpose of this study was to examine the association between resting heart rate (RHR) and symptoms of depression among Korean adults. Methods: This study used data of Korean adults obtained from the Korea National Health and Nutrition Examination Survey (KNHNES, 2015∼2018). After excluding participants with missing data, a total of 14,021 participants were included for analysis. Participants were classified as depressed if they had experienced depression within the past two weeks, or were currently depressed, or were diagnosed as depressed. For the main analysis, participants were classified into five groups by resting heart rate (RHR), i.e., <60 bpm (beats per minute), 60∼69 bpm, 70∼79 bpm, 80∼89 bpm, and ≥90 bpm. The correlation between RHR and symptoms of depression was examined using logistic regression analysis after controlling for the confounders. Results: Compared to the participants with RHR of <60 bpm, the participants with RHR of 80∼89 bpm or ≥90 bpm showed higher level of symptoms of depression. [Men: 80∼89 bpm by 1.77 (95% confidence interval [CI] 1.07∼2.93) and ≥90 bpm by 3.20 (95% CI, 1.68∼6.08), Women: ≥90 bpm by 1.71 (95% CI, 1.04∼2.81)]. Further stratified analyses were performed and yielded similar results regardless of the potential confounders such as age, BMI, income, marital status, and levels of physical activity. Conclusions: RHR was significantly associated with symptoms of depression. This study suggests the importance of RHR as a predictor of the risk of depression.

토픽 모델링과 로지스틱 회귀분석을 활용한 한국 사회의 혐오 담론 탐구 및 정책 결정 과정과의 상관성 분석

이지인(Jiin Lee),우병득(Byung-Deuk Woo),이민구(Mingu Lee),박세윤(Se-yoon Park) 한국자료분석학회 2022 Journal of the Korean Data Analysis Society Vol.24 No.5

한국 사회의 혐오 담론은 어떻게 변화되어 왔는가? 또한 혐오 담론이 실질적으로 정책 결정과정에 미치는 영향력은 어떠한가? 다양한 선행연구들이 혐오에 관한 학문적 이해의 폭을 넓혔음에도 불구하고, 혐오 담론의 변화 과정과 혐오 담론이 정책 결정 과정에 미치는 영향력에 대한 이해는 여전히 부족하다. 본 논문은 2000년부터 2021년까지 한국 사회의 혐오 담론 지형을 실증적으로 파악하고 혐오 담론이 정책 결정 과정에 미치는 영향력을 살펴본다. 본 연구에서는 잠재 디리클레 할당(Latent Dirichlet Allocation, LDA) 기법을 활용하여 뉴스 빅데이터를 분석한다. 한국의 혐오 담론을 살펴본 결과 정치와 관련된 혐오는 지속적으로 높은 관심을 받아왔지만, 성소수자, 이민자, 남성, 플랫폼 등의 주제들은 특정 사건이 발생함에 따라 주목도가 상승하는 모습을 보였다. 이에 더해서, 로지스틱 회귀분석 모형을 통해 혐오 담론이 정책 결정 과정에 미치는 영향력을 분석함으로써 남녀갈등에 관한 혐오 기사의 수가 증가할수록 국회의원들의 여성 대상 폭력과 관련한 법안의 발의 확률이 감소한다는 점을 발견하였다. 또한, 성별과 혐오 기사 수와의 교차항을 활용하여 여성 의원들이 남성 의원들에 비해서 남녀갈등에 관한 혐오 기사의 수에 영향을 덜 받는다는 점을 검증하였다. How the discourse of hatred in South Korea has changed and what is the effect of the discourse on the policymaking process? This article empirically examines the changes in the discourse of hared in South Korea from 2000 to 2021. Analyzing news big data based on the Latent Dirichlet Allocation(LDA) models, we found that the hatred related to politics has consistently received great attention. On the contrary, the salience of non-political hatred such as the hatred against LGBT, immigrants, men, and platforms fluctuates according to the occurrence of specific events. With the passage of time, new hatred topics including AI and COVID-19 emerge, but the existing types of hatred are observed even within the new themes. In addition, this article using logistic regression models demonstrates that there is a statistically and substantively significant relationship between the number of news articles concerning hatred against gender conflict and the probability of sponsoring bills about violence against women. Also, this article finds that male legislators compared to their female counterparts are more sensitive to the number of news articles about hatred.

제주도 화산암류에 대한 지구화학적 연구

김지인(Jiin Kim),최성희(Sunghi Choi),고기원,박준범(Junbeom Park ),류종식(Jongsik Ryu) 대한지질학회 2018 대한지질학회 학술대회 Vol.2018 No.10

Red/green/blue selective phototransistors with a hybrid structure of quantum-dots and an oxide semiconductor

Yu, Jiin,Kim, Byung Jun,Park, Sungho,Han, Il Ki,Kang, Seong Jun Institute of Pure and Applied Physics 2018 Japanese Journal of Applied Physics Vol. No.

<P>Color-selective phototransistors have been developed using a hybrid film of quantum-dots (QDs) and an oxide semiconductor. The zinc oxide (ZnO) phototransistor with QDs with a 2.96 eV band gap showed a photocurrent when illuminated by 450nm light. The device with QDs with a 2.28 eV band gap started to show a photocurrent under 520 nm light, and the device with QDs with a 1.95 eV band gap showed a photocurrent under light with a wavelength of 635 nm. The photocurrent with low-energy photons, such as visible light, originated when small band-gap QDs absorbed and converted visible light into photoelectrons, and the transparent wide band-gap ZnO supplied a conductive channel in the conduction band to allow the photocurrent to flow through the device. Based on those results, we developed a color-selective phototransistor that can separate red, green, and blue light using a hybrid structure of ZnO and multilayer QDs. The device showed photoresponsivity values of 0.032, 0.053, and 0.26 mA/W to red, green, and blue light, respectively, which are different enough to distinguish the color of the visible light. Therefore, we fabricated and characterized a photogating inverter to convert the color of visible light into an electrical voltage signal. Our results show that the hybrid film of ZnO and QDs could be a feasible way to develop a highly transparent, full-color image sensor. (c) 2018 The Japan Society of Applied Physics</P>