Artificial Neural Network for Modeling the Tensile Properties of Ferrite-Pearlite Steels: Relative Importance of Alloying Elements and Microstructural Factors

Tae‑Woon Hong,Sang‑In Lee,Jae‑Hyeok Shim,Myoung‑Gyu Lee,Joonho Lee,Byoungchul Hwang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10

An artificial neural network (ANN) model was developed to predict the tensile properties as a function of alloying elementand microstructural factor of ferrite-pearlite steels. The input parameters of the model were composed of alloying elements(Mn, Si, Al, Nb, Ti, and V) and microstructural factors (pearlite fraction, ferrite grain size, interlamellar spacing, and cementitethickness), while the output parameters of the model were yield strength and tensile strength. Although the ferrite-pearlitesteels have complex relationships among the alloying elements, microstructural factors, and tensile properties, the ANNmodel predictions were found to be more accurate with experimental results than the existing equation model. In the presentstudy the individual effect of input parameters on the tensile properties was quantitatively estimated with the help of theaverage index of the relative importance for alloying elements as well as microstructural factors. The ANN model attemptedfrom the metallurgical points of view is expected to be useful for designing new steels having required mechanical properties.

600W급 IPMSM의 구동특성 변화에 따른 온도 내력 분석

이원식(Wonsik_Lee),고덕화(Duk-Hwa Go),김용태(Yong-Tae Kim),조규원(Gyu-Won Cho),김규탁(Gyu Tak Kim) 대한전기학회 2016 대한전기학회 학술대회 논문집 Vol.2016 No.10

본 논문에서는 동일 출력에서 연기전력 증가 및 형상 변경을 통한 효율 향상 전동기와 기본모델 전동기를 열 등가회로망법을 사용한 열해석을 수행하여 온도 내력을 비교, 분석하였다.

부신피질 자극호르몬 단독결핍 1례

박경식,이승현,최석영,박태규,이동화,이찬우,정성복,이인규 啓明大學校 醫科大學 1997 계명의대학술지 Vol.16 No.3

부신피질 자극호르몬 단독결핍은 국내에서 7례만이 보고된 희귀 질환이며 병인 및 경과 등 아직 불분명한 측면이 많다. 이는 질환지체의 희귀성도 있지만 치료후 자연경과에 대한 장기적인 추적검사가 이루어진 경우가 드물기 때문이기도 하다. 저자들은 비특이적인 전신증상을 주소로 내원한 폐경기후의 56세 여자 환자에서 자가면역질환의 증거없이 고프로릭틴혈증을 보인 부신피질 자극호르몬 단독결핍 1례를 경험하고 1년간의 부신피질호르몬 대치요법후 추적검사를 실시하였기에 문헌 고찰과 함께 보고하는 바이다. Isolated ACTH deficiency is a rare disorder which shows secondary adrenal insufficiency with normal states of other pituitary hormones. A 56-year-old postmenopausal woman complaining general weakness and intermittent mental confusion presented negligible serum cortisol and ACTH level with hyperprolactinemia and mild hyponatremia. Rapid ACTH stimulation test did not show significant increase of serum cortisol level. Combined pituitary stimulation test showed negligible response of cortisol and ACTH, and slightly decreased response of prolactin and gonadotropin. But the responses of TSH and GH were normal. There was no evidence of organic pituitary of hypothalamic lesion in brain MRI and antithyroid autoantibody was not detected in serum. After receiving 12 months of glucocorticoid replacement therapy, she skipped the medicine for 3 weeks and we performed follow-up endocrinologic tests. Serum ACTH and cortisol level was also negligible and prolonged ACTH simulation test showed normal response of serum cortisol. CRF stimulation test showed no response of serum ACTH. Basal prolactin level was decreased to near normal and combined pituitary stimulation test showed normal response of prolactin with slightly blunted response of TSH and GH. We concluded that the case was nonautoimmune origined isolated ACTH deficiency which was accompanied by hyperprolactinemia and resultant deficiency of gonadotropin, so we report this case with review of literatures.

유통정보시스템의 효율적 구축방안에 관한 연구 : 부산·대구지역을 중심으로 Focusing on the Sales Business in Pusan-Taegu

李奎煥,朴善泰,金香蘭 대구산업정보대학 1998 논문집 Vol.12 No.1

This study aimed first to correctly understand informationalization of distribution, that is POS System, EDI, EOS, and distributing VAN, second to observe the present condition and preceeding examples of construction of informationalization of distribution in our country and to execute analysis of corroborative evidence regarding informationalization of distribution centered on distributing companies in Pusan and Taegu districts, third to grasp the impeding primary factors when informationalization is built up, and fourth to present effective building up lans of informationalization of distribution in Pusan and Taegu districts which will be the foundation of informationalization of distribution in the distributing business circles. The writer studied, for the method of study, by dividing into theoretical study, research portion of the present condition and preceeding examples of building up informationalization of distribution, and analysis of corroborative evidence. For the theoretical study portion and analysis examples, the study method by documentary records was applied, and domestic and foreign books, theses and periodicals related to the informationalization of distribution were consulted. For the analysis of corroborative evidence, the writer studied by questionaires regarding opening of distributing markets, distriubuting environment and distributing information system of the distributing market by the retail dealers as its objects, and selected research by questionaires to collect information by personally visiting each company. About 15 universities and junior colleges related to the distributing industry in our country produce about 1,280 of fundamental manpower related to distrribution every year, and a portion of large-sized distributing companies established and are managing even inter-company colleges, but it is the real situation that these are not sufficient in quality and quantity. In order to cultivate manpower specialized in distribution, the industry, universities and government, forming a trinity, should cope with the matter jointly, and especially, the government level should newly establish subjects of study related to the distribution drastically and political and financial support should be necessarily followed. Also, if POS system is induced, as the source of tax revenue is completely exposed, compared with those companies which do not induce POS System, they will suffer disadvantage, so preferential treating method is necessary in case of application of valued added tax or income standard. The customary practice of dealing without data harmful to normal commercial transaction order and against equity is pointed out as the most fundamental problem point being held by the distributing business circle in our country. For the sake of effective building up the distributing information system, the source making rate shall be raised, the ratio of domestic made instruments of POS System shall be increased, by developing EOS System which can be connected with manufacturing companies, POS System shall be utilized effectively by connecting with the management information system of the whole enterprises, EIS (Executive Information System) and various data base, and shall be connected with EOS with other components of distributing channel and EOS and EFT (Electronic Fund Transfer) system shall be connected through EDI or VAN. Such distributing information system can accomplish composite distribution information systematization, so it can promote greatly the management power not only of distributing business but manufacturing business.

철근콘크리트 구조물의 휨 거동 해석

이태규 우송대학교 부설 산업연구원 1999 산업연구 Vol.1 No.2

To predict the entire load-deformation behaviors including the softening of reinforced concrete structures due to flexural failure, solution techniques are developed. the stiffness matrix of concrete elements considering the material onlinearity is derived. To demonstrate the validity of this algorithm, the analytical results are compared with the experimental results by others. This proposed method reduce greatly the computational time and needs the very small space of the computer main memory with comparison to the present method. The spurious sensitivity to the chosen element size in the result of analysis by finite element method for the materials with strain-softening can be overcome by modifying rigidities and curvatures for each element based on the concept of concentrated inelastic rotation at plastic hinge considering the applied axial load.

국제분쟁의 평화적 해결수단에 관한 연구

이태규 안양대학교 1997 논문집 Vol.17 No.-

國際紛爭은 이제 더 이상 당해 紛爭當事國들이 자의적인 힘의 논리로 武力의 행사와 그 위협 또는 침략행위로써 해결되는 대상이 아니다. 점점 커온 人類理性을 바탕으로 제 1 차 세계 대전 이후부터 일기 시작한 戰爭과 武力行使의 國際法的 規制의 노력은 유엔 憲章에 그 결정체가 담겨져 있다. 이러한 國際紛爭의 平和的 解決原則을 구체화하는 방법과 수단은 UN 헌장 제 33 조에 나열되어 있듯이 외교적 交涉, 周旋, 사실문제에 관한 審査, 仲介, 調停, 仲裁, 司法裁判, 地域的 해결기구의 이용 등으로 나뉘어진다. 특히 요즈음 들어 독립된 국제기관에 분쟁의 해결을 맡기는 경향이 대두됨에 따라 仲裁裁判이나 國際司法裁判의 중요성이 더욱 증대된다.섀??I[

호기성 생물막 여과법을 이용한 제지산업 폐수의 처리 특성

이태진,오중교,이용택,정두식 경희대학교 환경연구소 1995 環境硏究 論文集 Vol.6 No.-

This work researched the treatment characterization of paper mill waste water for Biological Aerated Filter (BAF)system. BAF process is ideal for reclamation and reuse of wastewater. It features excellent removal of organic matter and SS, Especially. it is easy maintain and achieves energe-saving and space-conservation when compared to conventionnal activated sludge method. This study resulted that upflow BAF system showed superior treatment efficiency to downflow one. The removal efficiencies of BOD, COD, SS were 85%, 80, 90%, respectively.

國際司法裁判所 判決의 履行

이태규 안양대학교 복지행정연구소 2002 福祉行政硏究 Vol.17 No.-

본 논문은 세계법원은 국제사법재판소이 판결이 어떻게 실효적으로 이행될 수 있는지에 대한 여러 방안들을 검토하고 있다. 이들 방안들은 첫째, 국제기구를 통한 이행방법, 둘째는 당사자간 직접해결방법, 셋째로 제3국의 협력을 통한 방법 등이 있다. 물론 당위는 존재가 뒷받침 될 때에만 의미가 있다는 것은 주지의 사실이다.

美通商法 第301條의 問題點 : "不合理性" 判斷의 姿意性 問題를 中心으로 Arbitrariness of "Unreasonableness" Standard

이태규 안양대학교 복지행정연구소 1996 福祉行政硏究 Vol.12 No.-

국제사법재판소의 역사적 배경에 관한 연구

이태규 안양대학교 사회과학연구소 1997 社會科學硏究 Vol.5 No.-

ABSTRACT Nowadays when the international relationship has been "renormalized" since the end of the Cold War era, among the means of peaceful settling international disputes, a judicial way of settlement, whIch embodies the pre-fixed judiciary procedures, and an independent and neutral judiciary organ free from any kinds of impacts and influences including the disputed states', has been treated as a favored means despite its most authoritative and final nature. This kind of new tendency in which the pursuit of international disputes settlement through the law rather than politics supported by power leads me in this article to discuss what the Interational Court of Justice is and what its historic backgrounds are really about.