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코일형 나선 전열관의 내부 응축열전달 특성에 관한 실험 적 연구
박종운,권영철,한규일,Park, Jong-Un,Gwon, Yeong-Cheol,Han, Gyu-Il 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.12
An experimental study on condensation heat transfer characteristics of helically coiled spiral tubes was performed. The refrigerant is R-113. A refrigerant loop was established to measure the condensation heat transfer coefficients. Experiments were carried out uniform heat flux of 15 kw/m$^2$, refrigerant quality of 0.1∼0.9, curvature ratio of 0.016, 0.025 and 0.045. The curvature of a coil was defined as the ratio of the inside diameter of the tube to the diameter of the bending circle. To compare the condensation heat transfer coefficients of coiled spiral tubes, the previous results on coiled plain tubes and straight plain tubes were used. The results shows that the condensation heat transfer coefficients of coiled spiral tubes largely increase, as increasing Re and quality, compared to those of coiled plain tubes and straight plain tubes. As increasing degree of subcooling, however, the condensation heat transfer coefficients on coiled spiral tubes decrease. It is found that the heat transfer enhancement is more better than coiled plain tubes and straight plain tubes, as increasing curvature ratio.
IoT 서비스를 사용하는 사용자 계층별 차이에 대한 만족도 분석
박종운,권창희,Park, Chong-Woon,Kwon, Chang-Hui 한국정보통신학회 2017 한국정보통신학회논문지 Vol.21 No.1
2010년 이후 스마트폰의 폭발적 보급이 탄생시킨 SNS가 대중의 광고 플랫폼으로 자리 잡고 있으며, 사물인터넷(IoT)시대의 탄생이 단계적으로 초읽기에 들어간 것이 우리에게 이미 다가와 있다. 이에 위치기반 서비스를 활용한 다양한 IoT 서비스(비콘, O2O)가 활용되고 있는 것에 대한 유 경험 사용자들의 계층별 차이에 대한 만족도를 분석하는데 본 논문의 초점을 둔다. 논문의 내용을 전개하기 위하여 현재 서비스가 이루어지고 있는 대표적 IoT서비스의 종류와 전체적 활용 개념을 고찰한다. 가설은 피터모빌의 User Experience Honeycomp이라고 불리우는 UX벌집모형에서 용이성, 매력성, 신뢰성, 가치성 4가지로 설문을 재구성하였다. 본 연구에서 IoT 서비스를 제공하는 기업은 사용자의 만족도 차이에 따라 보다 정확한 맞춤형 서비스를 제공하는데 도움이 되는 기초자료로 활용이 될 수 있을 것으로 기대된다. Since 2010, SNS was holding the explosive spread of smartphones has created a place of public advertising platform, and it entered the Internet of Things (IoT) is born gradually countdown of the era came to us already. In utilizing a variety of location-based services IoT services (beacon, O2O) The focus of this paper to analyze the differences in satisfaction with the oil layer by experienced users of what is being used. We consider the type and overall utilization of the concepts typical IoT service in the current service is made to expand the contents of the paper. Hypothesis was reconstructed ease, attractiveness, a survey reliability, value four kinds of models, called Honeycomb UX, User Experience Honeycomp Peter Mobil. Company that provides the service IoT in this study are expected to be used as basic data to help provide a more accurate personalized service according to the user's satisfaction difference.
사물탕(四物湯)이 노화백서(老化白鼠) 뇌조직(腦組織)의 생화학적(生化學的) 변화(變化)에 미치는 영향(影響)
박종운,이기상,문병순,Park, Jong-Hun,Lee, Ki-Sang,Moon, Byung-Soon 대한한방내과학회 1998 大韓韓方內科學會誌 Vol.19 No.1
The present experiment was desined to examine catecholamines, 5-hydroxytryptamine, amino acids, malondialdehyde(MDA) and free radical scavening activity, by administering Samultang extract of a variety of concentraction to senile brain The results were summarized as followings: 1. Samultang significantly increased noradrenaline in the cortex, striatum, hippocampus and hypothalamus of the brain tissue of senile rats, and even though Samultang increased noradrenaline also in other brain tissue, there was no significance. 2. Samultang had effects on dopamine changes in hypothalamus of the brain tissue of senile rats. 3. Samultang significantly increased 5-hydrotryptamine in pons-medulla oblongota and cerebellum, but decreased in hypothalamus. 4. Samultang increased amino acid in the brain tissue of senile rats. 5. Samultang significantly decresed lipid peroxide production in the brain tissue of senile rats. 6. Samultang significantly decresed MDA and free radical in the brain tissue of senile rats. According to the above results, Samultang is assumed to improve brain function by reacting on biochemical of the senile brain, and that Samultang can be used to treat regressive brain disease carrying symptoms of psychoactive disorders.