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.

고온용 주름필터의 여과성능 특성

임정환,노학재,박영옥 대한환경공학회 2007 대한환경공학회 학술발표논문집 Vol.2007 No.12

觀察指導 小考

林貞煥 大邱敎育大學校 科學敎育硏究所 1978 과학·수학교육연구 Vol.3 No.-

국경의 왕

임정환,성상민 한국독립영화협회 2019 한국독립영화협회 기타간행물 Vol.- No.-

自然科 敎育의 學習評價에 對한 硏究 : 形成評價를 中心으로 Centered on the Formative Evaluation

林貞煥 대구교육대학교 1975 論文集 Vol.11 No.-

Compared with the existing view of evaluation, its new concept has been broadened and diversified. The present evaluation emphasizes its administrative and functional aspect while the new one places emphasis on its guiding and researching aspect. The desirable types of the evaluation of the elementary science education are summarized in three: Diagnostic, Formative and Summative evaluation. The thing to be stressed most in the evaluation of the elementary science education may be the procedure of the formative evaluation. It is as follows: 1. The learning objectives of the unit are subdivided into the actual behavioral objectives. 2. The unit to be studied is analyzed and selected. 3. The components included in the unit are analysed and an analysed evaluation chart is made. 4. Evaluation questionnaire is made and finally the evaluation begins.

일부 농촌지역 여성들의 혈청지질치와 관련요인에 대한 조사

임정환,조영채,이동배 한국농촌보건회 1997 농촌의학·지역보건 Vol.22 No.1

雙生兒에 對한 硏究

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.

소리.냄새상표의 효율적인 운영방안에 관한 연구

임정환,Im, Jeong-Hwan 한국특허정보원 2007 Patent 21 Vol.75 No.-

상악동 악성 종양의 전산화단층촬용 소견

임정환 대한영상의학회 1991 대한영상의학회지 Vol.27 No.6

This report is a retrospective study of 20 histologically proven malignant maxillary sinus cancer patients treated in the Dept. of Tumor clinic, Presbyterian Medical Center from Apr. 1982 to Aug. 1990. CT in an excellent imaging modality to asses accurately the extent of malignant maxillary carcinoma. The results were as follows: 1. The average age of the patients was 52.3 years old. 2. Histologically, the cancers were composed of epidermoid carcinoma, rhabdomyosarcoma, osteosarcoma, adenoidcystic carcinoma, adenocarcinoma and undifferentiated carcinoma. 3. All cases are advanced in instage. 4. CT findings of mixillary sinus cancer were soft tissue density filling the maxillary antrum, soft tissue dunsity beyond the antrum, low density within the mass, punctate or amorphous calcifications within the mass, antral expansion and irregular bony wall thickeness, maxillary bony wall destruction, lymphadenopathy and distant metastasis. 5. Destruction of surfaces of maxillary bony walls were seen in the nasal surface(20 cases), facial surface(16 cases), intratemporal surface(14 cases) and orbital surface(11 cases). 6. The superioty of CT 개 the conventional sinus radiologic imaging were evident in different are as of tumor evaluation of tumor invasion to the infratemporal fossa, posterior ethmoid sinus, orbital apex, nasopharynx, cribriform plate, sphenoid sinus and skull base. 7. The limitations of CT in evaluation of maxillary sinus was evident in woys, poor differentiation between pooled secretion within the obstructed sinuses and tumor, and determination of invasion of soft tissue structures.