• 한류연구
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• 제2권1호
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• pp.1-8
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• 2023

The South Korean automotive industry has been the major producer for both domestic and international market. This rises of the South Korean automotive industry has resulted in combination various factors ranging from government policies and the foreign investment. The Double Helix model provides a comprehensive and useful framework to understand how these factors have interacted to shape the history of the auto industry of South Korea. This research aims to provide the history of the Auto Industry in Korea based on the Double Helix Model. To collect textual literature dataset, the present author tried to screen and select adequate prior studies in the past and current literature to achieve the purpose of the study. According to the literature analysis, the history of the automotive industry in South Korea is an interesting case in the successful implementation of the Double Helix model. The model emphasizes the collaboration between the government and the private sector in achieving common goals. This research founded the four historical events of the development of the South Korean automotive industry based on the Double Helix Models. In sum, the research concludes that the Double Helix Model is an essential tool for understanding the historical development of the auto industry in South Korea.

• 한국인터넷방송통신학회논문지
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• 제16권5호
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• pp.229-233
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• 2016

본 논문에서는 4개의 유전자 핵염기 C, U(T), A, G를 행렬로 표시하고, $4{\times}4$ RNA(ribose nucleic acid)에서 $8{\times}8$ DNA(deoxyribose nucleic acid)로의 행렬 구조에 대해 서술한다. BCHJM (block circulant Hadamard-Jacket matrix)에 의해 DNA 이중나선 구조(double helix)를 해석한다. 직교 BCHJM은 비대칭 쌍 상보성(complementary)을 보이고 있다. 블록순환(block circulant) RNA 쌍 손상(damage) 신뢰성(reliability)은 기존 이중나선 보다 우수함을 보이고 있다. k=4, N=1인 경우 블록 순환 상보 쌍 신뢰도는 93.75%이고, k=4, N=4인 경우 신뢰도는 98.44%로 기존 이중나선의 경우 보다 4.69% 개선된다.

• 한국정보통신학회논문지
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• 제15권11호
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• pp.2500-2504
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• 2011

살아있는 생명체는 세포로 구성되며 성장 분열을 통해 스스로 복제할 수 있는 능력을 지녔다. DNA상의 변이, 즉 돌연변이는 자손의 생존과 번식에 불리하게 작용할 수 있고 이점을 줄 수 있는 양면성을 지녔다. 본 연구에서는 DNA 이중나선은 복제 주형으로 사용되기 위해서는 먼저 이중나선이 열리고 단일 가닥으로 분리되어야 한다. 이중 나선구조결합에서의 결합의 오류부분의 위치를 찾아내고 복구하는 방법을 제시한다.

• Journal of Biosystems Engineering
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• 제41권1호
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• pp.12-20
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• 2016

Purpose: Pepper prices have risen continuously because of a decrease in cultivation area; therefore, mechanical harvesting systems for peppers should be developed to reduce cost, time, and labor during harvest. In this study, a screw type picking head for a self-propelled pepper harvester was developed, and the optimal working conditions were evaluated considering helix types, winding directions of helix, and rotational speeds of the helix. Methods: The screw type was selected for the picking head after analyzing previous studies, and the device consisted of helices and a feed chain mechanism for conveying pepper branches. A double helix and a triple helix were manufactured, and rotational speeds of 200, 300, and 400 rpm were tested. The device was controlled by a variable speed (VS) motor and an inverter. Both the forward and reverse directions were tested for the winding and rotating directions of the helix. An experiment crop (cultivar: Longgreenmat) was cultivated in a plastic greenhouse. The test results were analyzed using the SAS program with ANOVA to examine the relationship between each factor and the performance of the picking head. Results: The results of the double and triple helix tests in the reverse direction showed gross harvest efficiency levels of 60-95%, mechanical damage rates of 8-20%, and net marketable portion rates of 50-80%. The dividing ratio was highest at a rotational speed of 400 rpm. Gross harvest efficiency was influenced by the types of helix and rotational speed. Net marketable portion was influenced by rotational speed but not influenced by the type of helix. Mechanical damage was not influenced by the type of helix or rotational speed. Conclusions: Best gross harvest efficiency was obtained at a rotational speed of 400 rpm; however, operating the device at that speed resulted in vibration, which should be reduced.

• 보건세계
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• 제40권7호통권443호
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• pp.20-23
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• 1993

• 공학교육연구
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• 제21권6호
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• pp.54-62
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• 2018

This study is an analysis of the process of the discovery of the DNA double helix structure from an engineering literacy education perspective. The explanation of the DNA double helix structure by James Watson and Francis Crick in 1952 is a well-known scientific episode. The process is also a combination of various incidents that can frequently happen in competitive engineering research and development situations. Therefore, the process of the discovery of the DNA structure is a remarkable event that can cover all subjects, such as engineering and ethics, research ethics, communication between researchers, engineering and leadership, engineering and teamwork, and engineering and women. This paper focuses on analyzing the research ethics issues associated with Rosalind Franklin and comparing and analyzing the three teams that were very close to the discovery of the DNA structure. By looking at why the Watson and Crick team got the final answer instead of the Linus Pauling's team or the Maurice Wilkins and Rosalind Franklin's team, the virtues of the technology development process that should be taught in engineering literacy education will be naturally presented.

• Bulletin of the Korean Chemical Society
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• 제16권8호
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• pp.755-760
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• 1995

• Bulletin of the Korean Chemical Society
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• 제34권9호
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• pp.2640-2644
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• 2013

The all-hydrocarbon i,i+4 stapling system using an oct-4-enyl crosslink is one of the most widely employed chemical tools to stabilize an ${\alpha}$-helical conformation of a short peptide. This crosslinking system has greatly extended our ability to modulate intracellular protein-macromolecule interactions. The helix-inducing property of the i,i+4 staple has shown to be highly dependent on the length and the stereochemistry of the oct-4-enyl crosslink. Here we show that changing the double bond position within the i,i+4 staple has a considerable impact not only on the formation of the crosslink but also on ${\alpha}$-helix induction. The data further increases the understanding of the structure-activity relationships of this valuable chemical tool.

• The Journal of the Acoustical Society of Korea
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• 제25권1E호
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• pp.14-19
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• 2006

Ultrasonic absorption and velocity spectra in bovine serum albumin (BSA) aqueous solutions have been measured at $20^{\circ}C$ over the frequency range 0.2-3 MHz in the pH range 1.5-13.2. The high-Q ultrasonic resonator and pulse-echo overlap methods were used. At acid pH's, excess absorption over that of pH 7 was explained by double relaxation. The pH dependences of the relaxation frequency and maximum absorption per wavelength, showed that the relaxation at about 200 kHz was related to the expansion of molecules and that about 3 MHz resulted from the proton transfer reaction of carboxyl group. At alkaline pH's, the excess absorption was explained by double relaxation. The relaxation at about 300 kHz was associated with a helix-coil transition, and that about 3 MHz was attributed to the proton transfer reaction of phenolic group. The rate constants and volume changes associated with these processes were estimated.

• 한국인터넷방송통신학회논문지
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• 제16권6호
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• pp.135-140
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• 2016

본 논문에서는 유전정보 DNA 표준 코드인 [UC;AG]를 64괘로 분석했다. 인간의 유전정보를 담고 있는 DNA는 인산과 당에 A(아데닌) C(시토신) G(구아닌) T(티민) 등 네 종류의 염기가 30억쌍 이어 붙여진 형태이다. DNA 표준 코드를 64괘로 나타내고, 이 코드를 Kronecker product를 이용하여 $16{\times}4$행렬로 나타냈다. 이 $16{\times}4$ 행렬은 이중나선의 중복성을 가지고 있으며, 이 중복성을 제거하면 RNA코드 $4{\times}4$ 행렬을 얻는다. $16{\times}4$행렬은 Kronecker product를 이용하여 소 행렬로 분해되었다. DNA 이중나선을 행렬로 표시하고 유전정보 괘 배열 코드를 분석하였으며 그 예를 예 5, 6에 나타냈다.