Effect of Welding Time on Resistance Spot Weldability of Aluminum 5052 Alloy

Gu‑Cheol Kim,Insung Hwang,Munjin Kang,Dongcheol Kim,Hyunsung Park,김영민 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1

In the study, the effect of welding time on resistance spot weldability of aluminum 5052-H32 alloy was analyzed throughsimulation and experiments. The resistance spot weldability was evaluated by measuring the tensile shear strength, nuggetsize, and hardness of welds with variations in the welding time. The simulated results of parameters such as tensile shearstrength and nugget size obtained using the SORPAS program were compared with the experimental results. Furthermore,a simulation was performed to calculate the temperature inside the weld nugget based on the distance from the center of thenugget. Hence, an optimum welding time to retain the required weld strength of the aluminum 5052-H32 alloy was obtained.

IEC 61131-3 표준을 따른 PC용 소프트웨어 PLC의 개발

이철수,정구,이제필,심주현 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.1

This paper describes a converting algorithm between programmable languages of a software PLC. It is based on IEC 61131-3 standard and PC. The proposed control logic is designed by the software model and common element with data type, variables, POUs(program organization unit) and execution control unit commonly used within programmable languages of IEC 61131-3 Standard. The generation method of object file is proposed on five programmable languaged based on IEC 61131-3. It is represented as follows; 1) the generation method using conversion algorithm for LD to IL with FBD(function block diagram), 2) the generation method using C code generation algorithm from SFC using the SFC execution sequence with FBD and ST(structured text). The proposed control logic generator was implemented by Visual C++ 6.0 and MFC an MS-windows NT 4.0.

제어 시스템 설계를 위한 IEC 1131-3 기반의 제어 로직 생성기의 개발

정구,심주현,이제필,이철수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-

This paper describes the methodology of an IEC 1131-3-based control logic generator for the control system design and converting algorithm between programmable languages. The proposed control logic generator is generated based on the software model and common element with data type, variables, POUs(program organization unit) and execution control unit commonly used within programmable languages of IEC 1131-3 Standard. The generation method of object file was proposed on five programmable language based on IEC1131-3. The generation method of object file is represented as following; 1) the generation method using conversion algorithm from LD to IL with FBD(function block diagram), 2) the generation method using C code generation algorithm from SFC using the SFC execution sequence with FBD and ST(structured text). The proposed control logic generator was implemented by Visual C++ and MFC on MS-windows NT 4.0

선인장 재배농가의 농업정보 요구 조사

정구현,이해길,박인태,이철희 한국농업정보과학회 2000 농업정보과학 Vol.2 No.1

This study was performed to investigate the status of using personal computer(PC) and to develope strategy to improve PC utilization of Cactus Farmers. Sixty nine farmers are surveyed to collect data. Many farmers had intention to use PC to manage Cactus and have recognized that PC is required to manage farm and to improve their life quality. As a result of analysis on farmers' need for agricultural information, they highly demanded infor-mation on production skills, marketing information, overseas production trends, imports and exports information. Some farmers using or having intention to use software for Cactus farming want software to be developed and dis-tributed to support production technolog', labor management production cost and benefit analysis etc.

간질환자들의 자기공명영상소견

주양구,손철호 啓明大學校 醫科大學 1995 계명의대학술지 Vol.14 No.4

To evaluate the causes of the epileptic seizure and the usefulness of the MR imagings for detection, localization, and differentiation of structural epileptogenic abnormalities. We retrospectively reviewed 101 patients who had seizure episodes and had undergone brain MRI for recent 1 years. The causes of the seizure were classified into brain atrophy, traumatic or post-operative lesions, congenital or developmental anomaly, tumor, vascular malformation, white matter disease, infectious disease and others. The location of the lesions were classified onto diffuse, frontal, parietal, temporal, occipital and others. Fourty-two of the 101 patients had brain atrophy, 23 patients had lesions secondary to trauma or surgery, 12 had congenital or developmental anomaly, seven had tumor, six had vascular malfomation, four had white matter disease, two had infectious disease, and five others had two arachnoid cysts, one hydrocephalus, one eclampsia, and one tuberous sclerosis. The lesions were located at the parietal lobe in 17 patients, frontal lobe in 15, temporal lobe in 21, and occipital lobe in four. MR imaging is the technique of choice when examining a patient who is having seizures. Detection, localization, and differentiation of structural epileptogenic abnormalities are much better with MR imaging than other diagnostic method.

대기업의 경제력집중에 대한 한일 양국의 인식

강철구 培材大學校 社會科學硏究所 2012 사회과학연구 Vol.34 No.1

Lately, concentration of economic power by big business groups has become a issue in Korea. It occurs from the differences in views and interpretations from the politicians, the public, and the Big Business Groups. This leads to being sensitive to the stream of societies rather than being based on objective facts, resulting with distrust in the economic structure and political system, allowing social cost to occur. In comparison, in Japan there is the history of planning to achieve economic democracy through the process of the General Headquarters(GHQ) breaking up businesses and dismantling the Zaibatsu headquarters after the 1945. However, it must be recognized that after its dismantlement, the Zaibatsu Headquarters has ultimately contributed to Japan’s economic growth with changed names ‘Japan’s Business Group’ or ‘Keiretsu’. Therefore, by comparing the business groups between Korea and Japan, this research examines what influences the business group has on the state’s economy in the rapid economic growth period. Furthermore, it was also examined how the differences of viewpoints between Korea and Japan concerning concentration of economic power were formed and if optimal corporate governance exists. This resulted in the conclusion that the ownership structure and corporate governance in Korea’s big business groups must ultimately settle as the Korean model of corporate governance.

일측 경추 신경근증에 대한 전방경유 미세 추간공확장술의 기술상의 개선

김대용,김우경,이상구,김영보,박철완,박찬우 The Korean Neurosurgical Society 2004 Journal of Korean neurosurgical society Vol.35 No.2

장기적 트립토판 결여식이 생쥐의 유해감각예민도에 미치는 영향

서영대,박제민,김명정,전명호,양구범,장세헌,강철중,김정태,김용식 대한생물치료정신의학회 2000 생물치료정신의학 Vol.6 No.1

The depressive patients can be divided into two subgroups by presence and absence of pain symptoms. Those without pain symptoms have blunted pain sensitivity whereas those with pain have normal range of pain sensitivity, and are clinically characterized by anxiety and irritability. The aim of the study is to test if these clinical profiles of the depressives with pain symptoms are related with reduced level of brain serotonin(5-HT). Forty four mice were randomly divided into two groups : one group to be bred with tryptophan free diet and the other with normal control diet, each for 4 weeks. Before the beginning of the breeding period, measured were locomotor activity by open field test, anxiety by elevated plus maze and nociceptive sensitivity by tail flick test, before and after forced swimming(FS). During each FS, duration of immobilization was also measured. The sable sets of measurements were repeated at the end of the breeding period. The brain 5-HT and 5-hydroxyindoleacetic acid(5-HIAA) were measured by high performance liquid chromatography. The results were as follows 1.Four weeks of tryptophan free diet reduced significantly body weight, brain weight, and levels of 5-HT and 5-HIAA in the whole brain. 2.Tryptophan depletion did not influence basal nociceptive sensitivity as measured by tail flick latency before FS. The normal blunting of the pain sensitivity induced by forced swimming was preserved in the tryptophan depleted group. 3.Tryptophan depletion did not influence general locomotor activity in open field. 4.Tryptophan depletion increased significantly time spent on the open arms at the elevated plus maze test done before FS. This anxiolytic-like effect was reduced by FS. 5.Tryptophan depletion did not influence duration of immobilization during FS. From these results, it is suggested that the genesis of the depression with pain symptoms is not medicated by quantitative reduction of brain serotonin

일본의 기업통치구조와 개혁

강철구 ( Cheol Gu Kang ) 서강대학교 동아연구소 2004 東亞 硏究 Vol.- No.47

지역경제성장을 위한 세입분권 확대 방안

구균철(Gu, Gyun Cheol) 한국지방재정학회 2018 한국지방재정논집 Vol.23 No.2