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양문형 냉장고 내부 덕트 착상 방지를 위한 전산열유동해석
신승민(Seung-Min Shin),김병천(Byeong-Cheon Kim),장경식(Kyoungsik Chang),조용범(Yong Bum Cho),이상욱(Sang-Wook Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.6
본 논문에서는 양문형 냉장고에서 발생하는 착상(Frost)을 방지하기 위해 전산열유동해석을 이용하여 연구를 진행하였다. 냉동실에서 냉장실로 이동하는 유로에서 착상이 발생하며, 비정상해석을 통해 냉장고의 사이클을 고려하였을 때, 냉장실 내부 유동이 내부 덕트로 유입됨을 확인할 수 있었다. 유입된 유동의 유량을 감소시키기 위해, 3가지 냉장고 덕트 형상을 기존 형상과 전산열유동해석으로 비교하였다. 기존 모델에 base hole과 2nd hole을 추가한 모델을 적용하였을 때, 4번째 사이클(9분)동안 0.015kg으로 가장 적은 유량을 보였다. The present work was studied to prevent frost developed in a side-by-side refrigerator using CFD. The frost occurs in the flow path from the freezer to the refrigerator. There was an inflow of the fluid in the refrigerator into the inner duct when the cycle of the refrigerator was considered by unsteady Computational Flow analysis. To reduce the flow rate of the air from the fridge, three types of ducts were compared with the original model using CFD. The lowest flow rate of 0.015kg was observed in the duct that the base hole and 2nd hole were applied to the existing model.
특이값 분해를 이용한 효율적인 백색가우시안 잡음대역 선정 방법
신승민(Seung-min Shin),김영수(Young-soo Kim),김상태(Sang-tae Kim),석미경(Mi-kyung Suk) 한국통신학회 2009 韓國通信學會論文誌 Vol.34 No.3
배경잡음 측정은 전파환경 조사 및 주파수 점유율의 비교기준인 임계레벨을 산출하는데 반드시 수행되어야 하는 매우 중요한 과정이다. 배경잡음 측정은 측정대상 대역에서 가급적 잡음만으로 구성된 부대역을 선정하고, 선정된 표본 부대역에 대하여 잡음전력을 측정하여 대상대역에 대한 대표값으로 사용하는 과정으로 이루어 진다. 본 논문에서는 배경잡음으로 백색가우시안 잡음을 가정하고, 잡음 측정의 첫 번째 단계에서 신호가 적고 대부분 잡음으로만 구성된 대역을 선별하는데 적용될 수 있는 특이값 분해 (singular value decomposition, SVD)를 이용한 잡음대역 선정 방법을 제안한다. 기존에 널리 쓰여지는 방법인 신호강도확률분포 (amplitude probability distribution, APD) 방법과의 성능비교를 통하여 우수성을 확인하였다. Measurement of the background radio noise is very important process being used in survey of radio noise environment, calculating the threshold level for the frequency occupancy measurement and so forth. First step of background radio noise measurement is to select the sample sub-band which is mostly dominated by the background white Gaussian noise (WGN) within the target band. The second step is to carry out the main measurement of radio noise on this selected sample sub-band for the representative value of the noise power. In this paper, a method for selection of sample sub-band for the effective background radio noise measurement using SVD is proposed under the assumption that background radio noise is WGN. The performance of the proposed method is compared with that of the APD method which is widely used for the same purpose. Simulation results are shown to demonstrate the high performance of the proposed method in comparison with the existing APD method.
신승민 ( Seung Min Shin ),박상만 ( Sang Man Park ),황병식 ( Byung Sik Hwang ),설수환 ( Soo Hwan Seol ),서향은 ( Hyang Eun Seo ),김세환 ( Se Hwan Kim ),구미진 ( Mi Jin Gu ),신지열 ( Ji Yeol Shin ) 대한소화기학회 2010 대한소화기학회지 Vol.56 No.6
Mesothelioma is a rare aggressive tumor arising from the mesothelial cell and regarded as universally fatal disease with average survival around 1 year. The incidence rate is varied from one to forty per million in different countries and increasing by the year. The most common site of tumor origin is the pleura and only 20% to 33% of mesothelioma arise from the peritoneum. There are increasing reports of malignant mesothelioma with forty to fifty fatal cases per year in Korea. Histological studies with immunohistochemical stain is helpful for the diagnosis of peritoneal mesothelioma and imaging modality alone is not sufficient for diagnosis, so it is difficult to confirm diagnosis. A 64-year-old male patient was admitted to the hospital with a palpable mass on abdomen. The 6×6 cm sized huge mass was seen on the body of stomach adjacent to the peritoneum. We report a case of malignant peritoneal mesothelioma without evident exposure to asbestos, of which direct invasion to the gastric mucosa was confirmed by endoscopic biopsy and immunohistochemical stain. (Korean J Gastroenterol 2010;56:377-381)
박상만 ( Sang Man Park ),신승민 ( Seung Min Shin ),서향은 ( Hyang Eun Seo ),김세환 ( Se Hwan Kim ),김현수 ( Hyun Soo Kim ),박종훈 ( Jong Hun Park ),김장호 ( Jang Ho Kim ),손경락 ( Kyung Rak Sohn ) 대한소화기학회 2009 대한소화기학회지 Vol.54 No.6
Hemangioma is one of the most frequently encountered benign hepatic neoplasm which can develop secondary degeneration. Sclerosed hemangioma is a rare disease histologically characterized by large amount of collagen and elastic fibril between sclerosed small vessels. Its differential diagnosis is very difficult. It should be included in the differential diagnosis of other hepatic lesions such as hepatocellular carcinoma, intrahepatic cholangiocarcinoma, and metastatic hepatic tumor. A 77-year old male was admitted with upper abdominal discomfort. Abdominal ultrasonography revealed GB stone, dilated common bile duct with bile duct stone, and a 4.6 cm sized hyperechoic mass at segment 5 and 6 of the liver. Abdominal dynamic computed tomography demonstrated dilated intrahepatic bile ducts and a 5×5 cm sized mass which showed minimally delayed enhancement. Abdominal magnetic resonance imaging revealed the mass with low signal intensity in T1 weighted image, high signal intensity and focal low signal in T2 weighted image which showed minimal enhancement. We removed common bile duct stone with endoscopic retrograde cholangiopancreatography then decided to undergo right lower segmentectomy of liver due to possibility of cholangiocarcinoma. Histopathological examination of hepatic mass showed large amount of fibrous tissue with occasional residual vascular channels. We describe one case of sclerosed hemangioma mimicking cholangiocarcinoma. (Korean J Gastroenterol 2009;54:399-403)
인터넷 게시판에서의 이견 읽기와 논변구성과 정치적 관용에 미치는 영향
송현주(Hyun-Joo Song),신승민(Seung-Min Shin),박승관(Sung-Gwan Park) 한국언론학회 2006 한국언론학보 Vol.50 No.5
One of the core ideas of democracy should be the sustenance of diversity. And the diversity depends on the ability of citizens to disagree other's views and at the same time, to tolerate dissonant viewpoints. Under the condition that communication networks tend to be homogeneous due to the social pressure felt by the minorities, however, public communication venues in which citizens can experience dissonant opinions are limited. The implication of the Internet to democracy lies in the possibility that people freely express their opinions on Electronic Bulletin Boards(EBB's). Therefore, most studies on EBB's focuses on the expression(or writing) on the Internet. The problem is that the Internet is an asynchronous medium where speaking does not always result in listening. For that reason, to differentiate the acts of writing and reading on the Internet and their effects on the users. This study explored the effects of reading dissonant opinions on the Internet on citizens, focusing on argument repertoire and political tolerance. Data from a survey show that reading dissonant opinions increases my argument repertoire and dissonant argument repertoire. And dissonant argument repertoire has a positive effect on political tolerance while my argument repertoire has a negative effect on political tolerance. The implications of the results to the relationship between public communications and civic attitudes are discussed.
비전투(非戰鬪) 사고에 의한 손실예방을 위한 해군 안전보건경영시스템 도입 연구
한정우(Jeong Woo Han),신승민(Seung Min Shin),백은성(Eun Sung Baek),김병직(Byeong Jik Kim),박교식(Kyo Sik Park) 한국위험물학회 2020 한국위험물학회지 Vol.8 No.1
The Navy is committed to protecting the lives and property of the people and defending the national interests by dispatching operations not only to the Korean Peninsula but also to the Aden Bay. Furthermore, in order to develop into a strong navy, the former soldiers are making unanimous efforts to introduce advanced military power and possess strong armament. However, the safety accidents occurring in the Navy are not only losing valuable lives, but also enormously impeding mission performance. In spite of various efforts to prevent safety accidents, constant accidents mean that there are limits to the safety management approach so far. Therefore, in this paper, by attempting to approach the safety management system to increase the current level of safety management, an institutional approach to help accident prevention and an infrastructure for stable operation of the safety and health management system introduced in the Navy It was proposed to build.