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DEVELOPMENT OF A FLOW NETWORK SIMULATION PROGRAM PART I – FLOW ANALYSIS
임정환,황용서 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.6
An in-house simulation program was developed that can be utilized to predict flow characteristics such as pressure and velocities in any flow network system comprising multiple flow components, i.e., pipe, pump, heat exchanger, valves, etc. Although the code is intended for applications to network flow systems in a vehicle, it is written in a generalized manner to handle any possible network configuration of flow components. Therefore, it can easily function in various industrial applications. The network system where the flow is assumed to be one-dimensional is mathematically formulated by applying two conservation rules, mass and energy, to each flow component. These rules produce a set of non-linear equations. These non-linear equations are solved iteratively by adopting the Newton-Raphson scheme. This program has been tested in many different cases to demonstrate its validity and applicability. In this paper, two examples are introduced to show how the program can be used to find solutions in real engineering problems. Throughout the study, it was found that the code can most efficiently be used to verify a proposed design concept in an early design stage of the vehicle development cycle. The thermal analysis portion of the program will be dealt with in Part II of the paper. An in-house simulation program was developed that can be utilized to predict flow characteristics such as pressure and velocities in any flow network system comprising multiple flow components, i.e., pipe, pump, heat exchanger, valves, etc. Although the code is intended for applications to network flow systems in a vehicle, it is written in a generalized manner to handle any possible network configuration of flow components. Therefore, it can easily function in various industrial applications. The network system where the flow is assumed to be one-dimensional is mathematically formulated by applying two conservation rules, mass and energy, to each flow component. These rules produce a set of non-linear equations. These non-linear equations are solved iteratively by adopting the Newton-Raphson scheme. This program has been tested in many different cases to demonstrate its validity and applicability. In this paper, two examples are introduced to show how the program can be used to find solutions in real engineering problems. Throughout the study, it was found that the code can most efficiently be used to verify a proposed design concept in an early design stage of the vehicle development cycle. The thermal analysis portion of the program will be dealt with in Part II of the paper.
林貞煥 慶北大學校 1962 論文集 Vol.5 No.-
1. One hundred twelve twins which are 59 male pairs, 36 female pairs, 17 pairs of hetero sex were examined in Kyung pook province. 2, These twins were classed as 71 monozygotes (male 46 femal 25) and 41 Dizygotes (male 13 female 11 male-female 17). 3. Most twins are likely to be feeble headed children or weak minded children. (Monozyogtes has more possibility to be so.) 4. Comparing Monozygotes with Dizygotes, Mutual relationship of IQ as well as that of all character is close each other. 5. Only the height in physique has been influenced much more by the heredity than the situation of the posteriority. 6. The running and the brood jump in the physical ability have little influence of the situation of the posteriority. 7. The low mutual relationship of VQ, shows that character of twin brothers have much differences: there are many unfamiliar twins, while there are intimate twins.
결절성 경화증에 동반된 상의하 거대 세포 성상세포종의 내시경적 수술 - 증 례 보 고 -
임정환,송준혁,김명현,박향권,김성학,신규만,박동빈,Lim, Jeong-Hwan,Song, Jun-Hyeok,Kim, Myung-Hyun,Park, Hyang-Kwon,Kim, Sung-Hak,Shin, Kyu-Man,Park, Dong-Been 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.4
The authors present a rare case of subependymal giant cell astrocytoma which successfully treated with endoscopic tumor resection. A 15-year-old boy was presented with multiple episode of generalized seizure and intermittent headache for 5 years. The patient had facial adenoma sebaceum, multiple nevi on his back, and mental retardation. Cerebral MRI scans showed a round tumor located at the frontal horn of right ventricle near the foramen monro. The tumor was totally removed with endoscopic procedure and histologically confirmed as a subependymal giant cell astrocytoma. Subependymal giant cell astrocytomas can cause all the clinical problems that are associated with other types of intracranial tumor. However, surgical indication is not well standardized, because of the lack of basic knowledge about the tumor and the likelihood of surgical morbidity. We believe that endoscopic surgery, a minimally invasive technique, can circumvent the surgical disadvantage while achieving the surgical goal.