• 대한토목학회논문집
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• 제12권3호
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• pp.57-64
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• 1992

본 논문에서는 교량사의 한 분야로 주교(舟橋)(부교(浮橋)) 제도(制度)에 대한 사적고찰(史的考察)과 전통고유주교(傳統固有舟橋)가 어떠한 구조형식(構造形式) 인지에 대하여 중점적으로 살펴보았다. 주교제도가 완비된 조선조말(朝鮮朝末) 제 22대 정조(正租)때 주교(舟橋)을 놓기 위한 주교사(舟橋司)라는 상설기관을 설치하였는데 이 주교사에서 제정한 주교설치(舟橋設置) 절차인 주교사절목(舟橋司節目)과 이에 대한 정조의 변론(辯論)과 어제문(御製文)으로 지은 주교지남(舟橋指南)이 기록으로 전한다. 이것을 바탕으로 전통주교를 오늘날의 교양사(橋梁史) 한 부분으로 구성하여 기술사적(技術史的)인 측면에서 고찰하였다.

• Journal of Electrical Engineering and Technology
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• 제1권4호
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• pp.414-422
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• 2006

Deterministic techniques have been applied in power system planning for many years and there is a growing interest in combining these techniques with probabilistic considerations to assess the increased system stress due to the restructured electricity environment. The overall reliability framework proposed in this paper incorporates the deterministic N-1 criterion in a probabilistic framework, and results in the joint inclusion of both adequacy and security considerations in system planning. The combined framework is achieved using system well-being analysis and traditional adequacy assessment. System well-being analysis is used to quantify the degree of N-1 security and N-1 insecurity in terms of probabilities and frequencies. Traditional adequacy assessment is Incorporated to quantify the magnitude of the severity and consequences associated with system failure. The concepts are illustrated by application to two test systems. The results based on the overall reliability analysis framework indicate that adequacy indices are adversely affected by a generation deficient environment and security indices are adversely affected by a transmission deficient environment. The combined adequacy and security framework presented in this paper can assist system planners to realize the overall benefits associated with system modifications based on the degree of adequacy and security, and therefore facilitate the decision making process.

• 공학교육연구
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• 제22권5호
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• pp.49-55
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• 2019

Folded structure is widely applied in various engineering fields. Many of the Japanese folding fans in the Edo era (1603-1868) have been successfully blended with the processing technology of "natural materials" that is the origin of Japan's "Monodzukuri" (craftsmanship) and its application "artistic originality". The charm of a fan lies in the diversity of stereoscopic expression not born in plane representation. For example, the effects of folds, the expression of the front and back sides flowing from the front to the back by double-sided description, and the two-layer effect of raising the backside from the surface using the permeability of Japanese paper, the calculated depiction are also seen. Moreover, by handling the fan, it also produced an illusion effect which skillfully calculated the change due to movement of the viewpoint. Students experience the natural materials such as Japanese paper, bamboo and starch paste, which are the materials of paint and fan at the time, and processing method, and know the difference with the current one. This study is to verify the effectiveness of engineering education which gains experience by making concrete fans and to understand deeply this traditional technology with the artistry of a Japanese fan at the same time. And we can learn from the characteristics of the fan to Japan's history and culture.

• 헤리티지:역사와 과학
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• 제49권3호
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• pp.136-153
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• 2016

본고는 '장 담그기'라는 구체적 사례를 통해 무형유산으로서 음식의 전승성이라는 문제를 살펴보고, 음식관습을 지속 유지시키는 원동력이 무엇인가에 대한 답을 모색하기 위해 마련되었다. 이를 위해 필자는 서로 다른 세 가지 유형의 구체적 사례를 통해 '장 담그기'의 전승양상에서 나타나는 지속과 변화를 살펴보았다. 첫 번째 사례는 '장 담그기'의 전과정을 직접 수행하는 경우다. 두 번째는 구입한 메주로 '장 담그기'를 실천하고 있는 사례다. 세 번째 사례는 음식에 관한 이념을 공유하는 사람들끼리 계를 조직하여 매년 장을 담그고 '씨간장'을 적립해가는 경우로, 매우 새로운 음식공동체의 출현을 엿볼 수 있다. '장 담그기'전승에서 변화를 이끌어내는 요인은 도구와 기술, 생산과 소비, 그리고 음식공동체의 변화라 할 수 있다. 이러한 변인들 때문에 오늘날 '장 담그기'전승은 실제 상당 부분 변화되고 있지만, 면담대상자들은 전통적 방식으로 만든 장맛이 유지되는 한 본인들의 '장 담그기'전통은 지속된다고 믿고 있었다. 따라서 '장 담그기'가 계속 전승되고 유지되기 위해서는, 장맛을 기억하고 향유할 줄 아는 '맛의 공동체'의 지속에 관심을 가질 필요가 있다.

• 건축역사연구
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• 제32권1호
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• pp.61-72
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• 2023

Korean architecture classifies Banja (the decorated flat of the ceiling visible from the inside) of Royal Palaces into two types: Woomul(water-well, 井) banja, which inserts rectangular wooden board into lattice frame, and paper banja, which applies paper to the flat ceiling. Such classification was established in the 19th century. Before that, Banja was classified according to what was inserted into the lattice frame, either wooden or paper board. At first, the banja that used paper board was widely installed regardless of the purpose or nobility of the building. However, since the 17th century, the use of paper board banja became mostly restricted to Ondol (Korean floor heating system) rooms which are characterized by private usage and the importance of heating, and it was considered inferior to wooden board banja in terms of rank or grace. The contemporary paper banja was mainly installed in low-rank ondol rooms until the late 19th century to early 20th century, when roll-type wallpaper was introduced from the West and the paper banja came to decorate the King's and Queen's bedrooms. The traditional paper board banja benefits heat reservation, reduces the weight of the ceiling, and allows the adjustment of the lattice frame size. Furthermore, it can feature unique artistry if covered with blue, white, or red Neung-hwa-ji (traditional flower pattered paper).

• 전기학회논문지
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• 제60권8호
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• pp.1617-1621
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• 2011

In this paper, in order to reduce the electrical disaster such as electrical fire at traditional markets, we need to develop the circuit breaker which is able to monitor the power status of electrical equipments. Therefore, for solving the those problems, we developed the detection censor(ZCT, CT) and equipment of data analysis and transmission. The detection censor and equipment is able to monitor the electrical equipments condition(over current, leakage current, arc, etc.). We constructed Test-Bed for testing reliability of the circuit breaker and obtained certification. And we tested the over current, leakage current and arc under the normal condition. This paper will be used to the data for development an cabinet panel which is able to monitor the actual loads.

• 전기학회논문지P
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• 제65권4호
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• pp.316-320
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• 2016

This paper proposes an alternate time-switched multiplexed space-frequency block coding technique for single-carrier modulation with frequency domain equalization. The traditional multiplexed space-frequency block coding technique for single-carrier modulation uses multiple groups of two transmitters and suppresses the interference signals of other SFBC groups at the receiver. In this paper, we reconfigure transmit signals to adapt them for alternate time-switched multiplexed SFBC for single-carrier modulation with frequency domain equalization and receiver structures and propose a structure for transmitter and receiver, show that its performance is better than the traditional algorithm by simulations.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 1996년도 추계학술대회 논문
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• pp.187-193
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• 1996

This paper presents a new approach to modify the traditional method for sampling inspectionby variables to suit undesired measurement conditions. On the basis of a systematic analysis of the effects of measurement errors on different types of acceptance schemes this paper gives two modified equations for revising the sampling size η and the acceptability constant $textsc{k}$ to form a new acceptance scheme (η'$textsc{k}$) under undesired measurement conditions. It has proved that the new method is suitable to different types of sampling inspection by variables including that for mean value and that for percent defective. The new acceptance scheme based on the proposed technique provides an engineering feasibility to replace the traditional scheme to suit undesired measurement conditions.

• 전기학회논문지P
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• 제66권1호
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• pp.48-52
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• 2017

This paper proposes a hybrid algorithm of space-time block coding and space-frequency block coding using alternate time switch. The traditional alternate time-switched space-time or space-frequency block coding technique for orthogonal frequency division multiplexing system does not provide a good performance with a variety of communication environments. This hybrid algorithm has searched good performance ranges in various environments in view points of mobile speed and doppler frequency. In this paper, we investigate better performance ranges for two algorithms, suggest a hybrid algorithm for dynamically changing communication environments, propose a structure for transmitter and receiver, and show that its performance is better than the traditional algorithm by simulations.

• 한국경영과학회지
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• 제37권3호
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• pp.95-116
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• 2012

The purpose of this paper is to show the effect of information sharing strategy on the supply chain performances. While traditional information sharing models assumed centralized stock information, recent supply chain practices often implement fully shared stock information, where real-time stock information is accessible on retailers. When retailers are competing with each other, this fully shared stock information may incur retailers' strategic order behaviors. Thus, this paper analyzes a simple two-level supply chain consisting of one warehouse and two identical competing retailers where the real time stock information is fully shared. The warehouse uses the traditional echelon stock policy. Under this environment the retailers' reorder decisions are derived using the order risk concept and the retailer competition mechanism is analyzed. Computational results show that the supply chain performace degradation in the fully shared stock information is quite significant, implying the importance of designing information sharing strategies in the supply chain design phase.