• 대한전기학회논문지:전력기술부문A
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• 제48권5호
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• pp.586-592
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• 1999

We investigate the characteristic of 소데 responses of the Manabe standard form which is used recently for design of the controller. We obtain some theorems and these theorems have the properties of the relationship between the roots of the polynomial and the stability indices which are used for the Manabe standard form. The Manabe standard form has the following properties: The sum of the squal to zero, the sum of the reciprocal of the squared roots is greater than zero and the parameter $\tau$ is the negative value of the sum of the reciprocal of the roots. We compare the step responses of the Manabe standard form with those of the ITAE form, the dead beat response and Bessel forms. We choose the 6th order closed loop polynomial and keep the same settling time for the four forms. Under these conditions we find that the Manabe standard form have faster 90% rising time than the Bessel and dead beat response. We see that the ITAE, bessel and dead beat responses have some overshoot, whereas the Manabe standard form has none. We also compare the Manabe form with the other three forms for the controller design using the pole assignment technique. If the open loop transfer function is a type-1 system (transfer functions having one integrator), then, for the closed loop system associated with the open loop transfer function, the steady state error of the unit ramp input is obtained in terms of the parameter $\tau$ of the Manabe standard form.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2012년도 춘계 학술논문 발표대회
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• pp.9-10
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• 2012

According to the recent trends in the construction business have been actively booming both overseas plant orders and high-rise buildings orders. In addition high-rise building projects have being promoted or is actually under construction in Korea. Frame structure review which is the most consuming period on high-rise building is essential on that project. In this study looks for the currently form system and compares to those large system used in high-rise buildings.

• 한국정밀공학회지
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• 제18권1호
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• pp.44-55
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• 2001

The flow behavior of semi-solid materials (SSM) is required to assist the industrial application of thixoforming technology. Particularly, to reduce many lead times, many numerical analysis packages have been developed to simulate required metal forming processes. The objectives of the development of SEMI-FORM for thixoforming process design are to predict the effect of various process variables such as pressing force, die temperature, and die velocity. However, there have not been any reports which adapt these packages to the specific characteristics of SSM. SO, this paper presents an overview of the development of thixoforming simulator of SEMI-FORM. The solver and post-processor of SEMI-FORM S/W for an automated thixoforming process design with arbitrarily shaped die are composed of FORTRAN Power Station 4.0 and Visual Basic 5.0, respectively. This developing SEMI-FORM S/W would be very useful for thixoforming practitioners and engineers to select the optimal process conditions to produce automotive parts with high quality.

• 한국안전학회지
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• 제17권1호
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• pp.87-93
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• 2002

In this thesis using FTA technique, the author proposes a new method of analysis of some accidents in construction work. Some efficient plans of safe facility investment are made out. For this study, I referred to 'The Death Accident in Construction Works', which have been published by Korea Industrial Safety Corporation from 1993 to 1999 for 6 years. I selected some of apartment constructions which have caused many deaths for the purpose of analysis in the study. I found that the concrete work using ferro-deck takes more deaths than the conventional construction. After finding this, I selected GANG FORM works using ferro-concrete which is the most widely used but causes many accidents. On the basis of the classification, I try to do some quantitative analyses by adding the death frequency and material factors. In order to draw up the most efficient investment plan, it is imperative that FT diagram be made out and that factors. In order to draw up the most efficient investment plan, it is imperative that FT diagram be made out and that minimal Cut Set be needed. It requires a great deal to labor and time to get Minimal Cut Set. The Minimal Cut Set which is formed of these process is the main factor to analyze disaster in the work. It is desirable that we add calculated percentage of accidents to these factors to these factors in value order, that is to say, from the high cost to low cost.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2004년도 추계학술발표대회 개요집
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• pp.67-69
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• 2004

The fuel assemblies as the nuclear fuel for the pressurized water reactor(PWR) are loaded in the reactor core throughout the residence time of three to five years. The spacer grid assembly, which is an interconnected array of slotted grid straps and is welded at the intersections to form an egg crate structure, is one of the main structural components of the fuel assembly. The spacer grid assembly is structurally required to have enough buckling strength under various kinds of lateral load acting on the fuel assembly so as to keep the fuel assembly straight. To meet the requirement, integrity on the spacer grid welding parts should be carefully checked. In this study, welding quality of the spacer grid assembly welded by several welding companies are examined and compared.

• Journal of the Korean Data and Information Science Society
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• 제12권1호
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• pp.89-97
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• 2001

Chen and Chen(FSS, 1993, 159-168) presented a reasonable analytical model of fuzzy closed-loop systems and proposed a method to analyze the stability of fuzzy control by the relational matrix of fuzzy system. Chen, Lu and Chen(IEEE Trans. Syst. Man Cybern., 1995, 881-888) formulated the sufficient and necessary conditions on stability of fuzzy closed-loop control systems. Gang and Chen(FSS, 1996, 27-34) deduced a linguistic relation model of a fuzzy closed loop control system from the linguistic models of the fuzzy controller and the controlled process and discussed the linguistic stability of fuzzy closed loop system by a linguistic relation matrix. In this paper, we study more on their models. Indeed, we prove the existence and uniqueness of equilibrium state $X_e$ in which fuzzy system is stable and give closed form of $X_e$. The same examples in Chen and Chen and Gang and Chen are treated to analyze the stability of fuzzy control systems.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2005년도 춘계학술발표대회 개요집
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• pp.109-111
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• 2005

Nuclear fuel assemblies for pressurized water reactors(PWR) are loaded in the reactor core throughout the residence time of three to five years. A spacer grid assembly, which is an interconnected array of slotted grid straps and is welded at the intersections to form an egg crate structure, is one of the main structural components of the nuclear fuel assembly. The spacer grid assembly is structurally required to have enough buckling strength under various kinds of lateral loads acting on the nuclear fuel assembly so as to keep the nuclear fuel assembly straight. To meet this requirement, it is necessary to weld the welding parts carefully and precisely. In this study, laser welding qualities of the spacer grid assembly welded by several welding companies, such as weld strength, weld penetration depth, and weld bead size, are examined and compared.

• 대한전자공학회논문지TC
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• 제37권11호
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• pp.23-31
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• 2000

평면형 구조에서 공간영역 그린함수를 구하기 위해서는 무한 Sommerfeld 적분을 계산하여야 한다. 무한 적분을 짧은 시간에 계산하기 위한 복소 영상법(complex image method)과 2단계 근사화법(two-level method)은 전원점과 관측점 사이의 거리가 가까운 경우에는 정확하지만, 거리가 멀어지면 오차가 커지게 된 다. 본 논문에서는 실수축 상의 적분경로에서 파수영역 그린함수를 근사화 함으로써 코플래너 도파로 구조에서 기존의 결과에 비해 정확한 closed-form 그린함수를 구하는 방법을 제시하였다.

• 대한가정학회지
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• 제39권5호
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• pp.89-105
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• 2001

This study on Jeung San Kyo, one of Korea's new religions, considered the name, kind, form, color and the thoughts of ritual dress which is involved in 15 religious blanches acting currently according to books and the actual research. The following is below. 1 Each names of ritual dresses called rigious branches are Bob Bok(법복), Doh Bok(도복), Yeah Bok(예복) and Jea Bok(제복). 2 In most religious blanches, ritual dress is the Korean cloths which Poh is wear above and Kwan is put on, and the form of Poh(포) is the similar with Durumagi(두루마기), Danryungpoh(단령포), Jungchimak(중치막), Jikryungpoh(직령포) etc, but not the form of Git, Moo and Yiohmim. Kwanmoh is named Chill-Chung-Kwan(칠층관), Yiun-Hwa-Kwan(연화관), Yiun-Kwan(연관), In-Hwa-Kwan(인화관), Tong-Chon-Kwan(통천관) etc. 3. In most religious orders but Dae Suun Jin Li Hueay(대순진리회), Jeung San Doe Jang(증산도장), Colors are used, white, lightblue, and yellow is used in Jeung San Pop Jong Kyo(증산법종교), Dong Doe Pop Jong Gyum Gang Doe(동도법 종금강도). White color means the mind of a people tradition, and light blue expresses an Oriental nation, namely, “Korea”, and is the color representing Jeung San Kyo, and yellow shows the central religion in the future. 4. Jeung San Kyo ceremony fashion reflects the ideologies of the principal role, the Um and Yang-five elements, and, nationalism according to form, color.

• 한국전통조경학회지
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• 제35권3호
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• pp.76-93
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• 2017

이 논문은 조선 후기 한강변 누정(樓亭)의 현황을 개괄하고 향후의 복원 방향을 고찰한 것이다. 1716년 저술된 엄경수(嚴慶遂, 1672~1718)의 "연강정사기(沿江亭?記)"를 연구대상으로 삼았다. 조선이 한양을 도읍으로 정한 이래, 한강은 최고의 유상지로 각광받았다. 조선의 사대부들은 한강 변에 누정을 건립하고 뱃놀이를 행하며 한강의 풍류를 만끽했다. 엄경수는 "연강정사기"에서 강안의 누정 29개를 순서대로 기록했는데 직접 배를 타고 실사한 정보에 기왕의 정보를 취합하여 한강의 누정을 종합적이고 체계적으로 정리했다. "연강정사기"를 살펴보는 작업은 한강의 문화와 역사에 주목하는 시대적 분위기와 맞물려 한강변 누정에 대한 종합적인 연구를 가능하게 할 것으로 생각된다. 본고에서는 엄경수의 "연강정사기"에 나타난 누정을 분석했다. "연강정사기"의 해설을 바탕으로 29개의 누정에 대한 위치를 비정하고 저마다 명명된 당호의 유래와 의미를 풀이했다. 아울러 "연강정사기"가 1716년에 기록된 점에 착안하여, 이를 중심으로 누정의 연혁을 개괄했다. 저마다의 누정이 건립된 시기를 조명하고 주인의 변천사를 확인하며 폐망해 사라진 정황을 밝혔다. 마지막으로 경관기록에 주목하여 누정에서 읊은 시문을 통해 풍광의 요소를 정리하고 당시 행해진 풍류 양상을 조명했다. 일부 누정은 그림으로 남아 모습이 전하니 당대의 제도와 면모를 자세히 알 수 있을 것이다. 이 논문에서는 "연강정사기"를 분석하여 기존에 알려지지 않았던 한강변 누정의 존재와 위치를 밝혀냈다. 아울러 몇몇 누정에 대해서는 기존에 알려지지 않은 연혁을 확인해 한강의 공간에 대한 재해석과 스토리텔링이 가능한 발판을 마련했다. 현재 한강은 많은 개발로 인해 기존의 면모가 대부분 사라진 상황이다. 그러나 개중에는 원형이 그대로 남아 복원이 가능한 곳도 있고 일부는 그림을 통해 위치를 옮겨 되살릴 수 있는 가능성도 충분하다. 특히 "연강정사기"는 배를 타고 한강을 유람한 결과물로 현재 한강의 유람선 등에 결부시킬 사항이 많으므로 현대적 재현과 활성화의 가능성을 제시할 수 있을 것으로 기대된다.