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Lee Dong Hyeon,Yu Seo Yeon,Yeom Seung Yeol,Lee Jeong Jun,Kang Byeong Chan,Cho Chung Hun,Lee Seok Goo,Kim Yeonsoo 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.8
As the movement for carbon neutrality spreads around the world, research on hydrogen energy is also being actively conducted. In the hydrogen value chain, liquefaction is a particularly energy-intensive process. Although the operating energy of the hydrogen liquefaction process can vary greatly depending on the season or regional cooling water temperature, previous studies have not taken this into account. In this study, we quantitatively identify the effect of the change in cooling water temperature on exergy destruction, specific energy consumption (SEC), and coefficient of performance (COP) of the liquefaction process. In addition, we propose a design improvement to reduce exergy destruction with the exergy analysis of multi-stream heat exchangers. A new design (auxiliary process) that reduces exergy destruction is proposed by analyzing the device where energy destruction occurs the most. When the cooling water temperature increases from 20 °C to 35 °C, there is a tendency for SEC and exergy destruction to increase and the COP to decrease. The new design with an auxiliary process shows a decrease in SEC and a reduced rate of increase in SEC in response to the increase in cooling water temperature. The base case without the auxiliary cycle shows that the SEC with cooling water of 35 °C is 14.66% greater than that with cooling water of 20 °C, while the proposed process shows the rate of increase of 9.70%. This means that adding the auxiliary cycle can improve the energy efficiency and increase robustness to variations in ambient conditions.
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기능성 위장질환의 종류에 따른 정신사회적 특성 및 삶의 질의 차이에 관한 연구
박승규,이상열,류한승,최석채,양찬모,장승호,염동한,이귀행,Park, Seung-Kyu,Lee, Sang-Yeol,Ryu, Han-Seung,Choi, Suck-Chei,Yang, Chan-Mo,Jang, Seung-Ho,Yeom, Dong Han,Lee, Kuy-Haeng 한국정신신체의학회 2021 정신신체의학 Vol.29 No.1
연구목적 본 연구에서는 기능성위장질환 환자를 과민성 대장 증후군, 기능성 소화불량, 기능성 변비, 기능성 흉부 작열감, 중복집단(두 개 이상의 기능성 질환이 중복)으로 분류하여 정신사회적 특성을 비교하고, 기능성위장질환 환자의 삶의 질과 연관된 요인들을 알아보고자 하였다. 방 법 일 대학병원 소화기 내과 전문의에 의해 기능성 위장질환으로 진단받은 환자 144명을 기능성위장질환 환자 집단으로 선정하였다. 인구통계학적 요인을 조사하였으며 정신사회적 요인을 평가하기 위해 Korean-Beck Depression Inventory-II (K-BDI-II), Korean-Beck Anxiety Inventory (K-BAI), Korean version of Childhood Trauma Questionnaire (K-CTQ), Multi-dimensional Scale of Perceived Social Support (MSPSS), Korean Version of Connor-Davidson Resilience Scale (K-CD-RISC), World Health Organization Quality of Life Assessment Instrument Brief Form (WHOQOL-BREF)를 사용하였다. 결 과 중복집단이 다른 집단에 비해 BDI-II 점수(F=11.09, p<0.001)와 BAI 점수(F=8.93, p<0.001)가 유의하게 높았다. 아동기 외상에서 정서적 방임(F=2.54, p=0.04)은 IBS 환자집단이 FD 환자 집단에 비해 유의하였다. FGID 환자에서 삶의 질은 우울증상(r=-0.196, p<0.01), 불안(r=-0.235, p<0.01), 아동기 트라우마(r=-0.222, p<0.01)와 음의 상관관계를 보였고, 사회적 지지(r=0.512, p<0.01), 회복탄력성(r=0.581, p<0.01)과는 양의 상관관계를 나타냈다. 결 론 연구결과 중복 환자 집단에서 우울, 불안이 유의하게 높았으며 아동기 외상에서 IBS 환자 집단이 FD 환자 집단보다 정서적 방임이 유의하게 높았다. 따라서 추후 기능성 위장질환 환자의 치료에 있어 정신사회적 요인에 대한 적극적인 개입이 요구된다고 하겠다. Objectives : The purpose of this study is to compare the psychosocial characteristics of patients diagnosed with functional gastrointestinal disorder (FGID) by classifying them into irritable bowel syndrome (IBS), functional dyspepsia (FD), functional constipation (FC), functional heartburn (FH) groups, and overlap group (two or more functional diseases) and to examine the factors associated with the quality of life (QoL) of patients with FGID. Methods : A total of 144 patients who were diagnosed with FGID were selected as the subjects. The demographical factors were investigated; Korean-Beck Depression Inventory-II (K-BDI-II), Korean-Beck Anxiety Inventory (K-BAI), Korean version of Childhood Trauma Questionnaire (K-CTQ), Multi-dimensional Scale of Perceived Social Support (MSPSS), Korean Version of Connor-Davidson Resilience Scale (K-CD-RISC), and World Health Organization Quality of Life Assessment Instrument Brief Form (WHOQOL-BREF) were used to evaluate the psychosocial factors. Results : TThe overlap group had a significantly higher K-BDI-II score (F=11.09, p<0.001) and K-BAI score (F=8.93, p<0.001) compared to other groups. In childhood trauma, the IBS patients had a difference in emotional neglect (F=2.54, p=0.04) than the FD patients. The QoL of FGID patients had a negative correlation with depression (r=-0.196, p<0.01), anxiety (r=-0.235, p<0.01), and childhood trauma (r=-0.222, p<0.01), and a positive correlation with social support (r=0.512, p<0.01) and resilience (r=0.581, p<0.01). Conclusions : Overlap group had a higher level of depression and anxiety, and the IBS patient group had a higher level of emotional neglect than the FD patient group in terms of childhood trauma.
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