• 식품과학과 산업
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• 제53권3호
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• pp.295-306
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• 2020

In Korea, confectionery refers to biscuits, snacks, chocolate, candy and gum. The first sweet in Korea is the Yumilkwa (oil-and-honey pastry) in the Goryeo Dynasty which was mentioned in history book, and is seen to be popular in medieval Korea. Korea's confectionery industry began in 1945 with the aid of the U.S. forces, Haitai Confectionery company produced sweets. The first confectionery product is 'Yeon yang gang'. In the 1970s and 1980s, the confectionery industry developed along with economic growth in Korea, and many of the products released at this time are still loved. Now the domestic market is saturated, sales of domestic confectionery companies are decreasing due to low-priced offers made by importers. It is necessary to develop products with high quality and brand power that can lead the market, and I think it is necessary to target the undeveloped market like the Halal market.

• 자동차안전학회지
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• 제11권3호
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• pp.30-36
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• 2019

This paper suggests a car-following algorithm for urban environment, with multiple target candidates. Until now, advanced driver assistant systems (ADASs) and self-driving technologies have been researched to cope with diverse possible scenarios. Among them, car-following driving has been formed the groundwork of autonomous vehicle for its integrity and flexibility to other modes such as smart cruise system (SCC) and platooning. Although the field has a rich history, most researches has been focused on the shape of target trajectory, such as the order of interpolated polynomial, in simple single-lane situation. However, to introduce the car-following mode in urban environment, realistic situation should be reflected: multi-lane road, target's unstable driving tendency, obstacles. Therefore, the suggested car-following system includes both in-lane preceding vehicle and other factors such as side-lane targets. The algorithm is comprised of three parts: path candidate generation and optimal trajectory selection. In the first part, initial guesses of desired paths are calculated as polynomial function connecting host vehicle's state and vicinal vehicle's predicted future states. In the second part, final target trajectory is selected using quadratic cost function reflecting safeness, control input efficiency, and initial objective such as velocity. Finally, adjusted path and control input are calculated using model predictive control (MPC). The suggested algorithm's performance is verified using off-line simulation using Matlab; the results shows reasonable car-following motion planning.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.257-259
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• 2008

Acceleration time history (ATH) used in the seismic analysis should envelop a target power spectral density (PSD) function in addition to the design response spectrum in order to have sufficient energy at each frequency for the purpose of ensuring adequate load. Even though design regulations require the ATH used in seismic analysis to meet a target PSD function, the reason that ATHs meet to a target PSD function is not described. Thus, artificial ATHs for high PSD function and artificial ATHs for low PSD function are generated. And then elastic and inelastic single-degree-of-freedom (SDOF) systems are loaded with these artificial time histories as the earthquake load. As a result, linear response and inelastic response of SDOF systems are affected by PSD function.

• 한국지구과학회지
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• 제24권4호
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• pp.281-289
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• 2003

본 연구의 목적은 세계의 유명한 자연사 박물관을 대상으로 관람객의 흥미도를 높이는 데 효과적인 전시 특성과 교육학적인 전시 특성을 알아보는데 있다. 대상이 되는 전시물은 런던에 있는 영국 자연사박물관, 시드니의 호주 박물관, 뉴욕 미국 자연사 박물관, 와싱턴 디시의 스미소니언 박물관이다. 특히 본연구에서 사용한 107개의 전시 표본들은 주로화석, 지구의 역사 그리고 광물과 같은 고체 지구과학교육 내용의 전시에 초점을 맞추었다. 조사를 위해 본 연구는 7개 항목으로 구성된 체크리스트를 완성했는데 각 항목들은 과학관과 자연사 박물관의 전시특성을 다루었던 기존의 문헌을 바탕으로 한 것이다. 또한 교육적인 측면은 Hein(1995)의 연구를 기초로 하였다. 이 연구에서 사용된 107개의 샘플 전시물은 연구자가 직접 방문하여 촬영하고 슬라이드 필름에 보관한 것을 통해 조사를 진행할 수 있었다. 위 4개의 박물관에 대한 조사 결과는 각기 특성있고 긍정적인 결과를 얻었으나 분석을 통해 각 박물관의 다소의 단점도 드러났다.

• ALGAE
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• 제31권2호
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• pp.167-174
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• 2016

Biological response of cells to variable conditions should affect the expression level of certain genes. Quantification of these changes in target genes needs stable internal controls. Real-time quantitative polymerase chain reaction (PCR) has traditionally used reference or ‘housekeeping’ genes, that are considered to maintain equal expression in different conditions, to evaluate changes in target genes between samples and experimental conditions. Recent studies showed that some housekeeping genes may vary considerably in certain biological samples. This has not been evaluated in red algae. In order to identify the optimal internal controls for real-time PCR, we studied the expression of eleven commonly used housekeeping genes; elongation factor 1-alpha, glyceraldehyde-3-phosphate dehydrogenase, β-actin, polyubiquitin, 30S ribosomal gene, 60S ribosomal gene, beta-tubulin, alpha-tubulin, translation initiation factor, ubiquitin-conjugating enzyme, and isocitrate dehydrogenase in different life-history stages of Bostrychia moritziana. Our results suggest that glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and 30S ribosomal gene, have the most stable gene expression levels between the different life history stages (male, female, carposporophyte, and tetrasporophyte), while the other genes are not satisfactory as internal controls. These results suggest that the combinations of GAPDH and 30S would be useful as internal controls to assess expression level changes in genes that may control different physiological processes in this organism or that may change in different life history stages. These results may also be useful in other red algal systems.

• 한국지진공학회논문집
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• 제25권2호
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• pp.83-91
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• 2021

Seismic designs for Korean nuclear power plants (NPPs) under earthquakes' design basis are noticed due to the recent earthquake events in Korea and Japan. Japan has developed the technologies and experiences of the NPPs through theoretical research and experimental verification with extensively accumulated measurement data. This paper describes the main features of the design-time history complying with the Japanese seismic design standard. Proper seed motions in the earthquake catalog are used to generate one set of design time histories. A magnitude and epicentral distance specify the amplitude envelope function configuring the shape of the earthquake. Cumulative velocity response spectral values of the design time histories are compared and checked to the target response spectra. Spectral accelerations of the time histories and the multiple-damping target response spectra are also checked to exceed. The generated design time histories are input to the reactor building seismic analyses with fixed-base boundary conditions to calculate the seismic responses. Another set of design time histories is generated to comply with Korean seismic design procedures for NPPs and used for seismic input motions to the same reactor containment building seismic analyses. The responses at the dome apex of the building are compared and analyzed. The generated design time histories will be also applied to subsequent seismic analyses of other Korean standard NPP structures.

• Korean Journal of Ophthalmology
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• 제32권6호
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• pp.497-505
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• 2018

Purpose: To evaluate and compare published methods of calculating intraocular lens (IOL) power following myopic laser refractive surgery. Methods: We performed a retrospective review of the medical records of 69 patients (69 eyes) who had undergone myopic laser refractive surgery previously and subsequently underwent cataract surgery at Samsung Medical Center in Seoul, South Korea from January 2010 to June 2016. None of the patients had pre-refractive surgery biometric data available. The Haigis-L, Shammas, Barrett True-K (no history), Wang-Koch-Maloney, Scheimpflug total corneal refractive power (TCRP) 3 and 4 mm (SRK-T and Haigis), Scheimpflug true net power, and Scheimpflug true refractive power (TRP) 3 mm, 4 mm, and 5 mm (SRK-T and Haigis) methods were employed. IOL power required for target refraction was back-calculated using stable post-cataract surgery manifest refraction, and implanted IOL power and formula accuracy were subsequently compared among calculation methods. Results: Haigis-L, Shammas, Barrett True-K (no history), Wang-Koch-Maloney, Scheimpflug TCRP 4 mm (Haigis), Scheimpflug true net power 4 mm (Haigis), and Scheimpflug TRP 4 mm (Haigis) formulae showed high predictability, with mean arithmetic prediction errors and standard deviations of $-0.25{\pm}0.59$, $-0.05{\pm}1.19$, $0.00{\pm}0.88$, $-0.26{\pm}1.17$, $0.00{\pm}1.09$, $-0.71{\pm}1.20$, and $0.03{\pm}1.25$ diopters, respectively. Conclusions: Visual outcomes within 1.0 diopter of target refraction were achieved in 85% of eyes using the calculation methods listed above. Haigis-L, Barrett True-K (no history), and Scheimpflug TCRP 4 mm (Haigis) and TRP 4 mm (Haigis) methods showed comparably low prediction errors, despite the absence of historical patient information.

• Structural Engineering and Mechanics
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• 제26권6호
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• pp.709-723
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• 2007

Considering the vast usage of time-history dynamic analyses to calculate structural responses and lack of sufficient and suitable earthquake records, generation of artificial accelerograms is very necessary. The main target of this paper is to present a novel method based on nonstationary Kanai-Tajimi model and wavelet transform to generate more artificial earthquake records, which are compatible with target spectrum. In this regard, the generalized nonstationary Kanai-Tajimi model to include the nonstationary evaluation of amplitude and dominant frequency of ground motion and properties of wavelet transform is used to generate ground acceleration time history. Application of the method for El Centro 1940 earthquake and two Iranian earthquakes (Tabas 1978 and Manjil 1990) is presented. It is shown that the model and identification algorithms are able to accurately capture the nonstationary features of these earthquake accelerograms. The statistical characteristics of the spectral response of the generated accelerograms are compared with those for the actual records to demonstrate the effectiveness of the method. Also, for comparison of the presented method with other methods, the response spectra of the synthetic accelerograms compared with the models of Fan and Ahmadi (1990) and Rofooei et al. (2001) and it is shown that the response spectra of the synthetic accelerograms with the method of this paper are close to those of actual earthquakes.

• 기록학연구
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• 제29호
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• pp.79-127
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• 2011

이 글은 한국 사회에 내재된 무수히 많은 대항기억들 중 '민간인학살사건'이라는 대항기억을 역사화 하기 위하여 구술이라는 방법론적 매개체에 대한 이론적 방법론적 논의를 시작해보기 위함이다. 즉 구술 자료의 수집에 앞서 '구술'이라는 행위의 근본적 바탕이 되는 '기억'에 대한 논의를 중심으로 지배기억과 대항기억의 발생과정, 대항기억으로써의 구술이 가지는 의미, 소외된 기억들의 역사화 필요성을 이론화한 후 구술사연구방법론, 구술기록의 질적연구방법론에 대한 논의를 통해 신뢰성이 높은 구술기록의 생산을 모색해보고자 하는 것이다. 이러한 기초를 바탕으로 구술이라는 특정 방법론에 대한 정확한 숙지 아래에서 어떤 질 좋은 기록물이 생산되는지를 알아볼 수 있는 한 사례로써 민간인 학살사건의 연구대상으로 선정된 경상북도 영덕군 창수면에 대한 구술기록화 과정이 진행되었다.

• 한국기록관리학회지
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• 제22권1호
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• pp.27-41
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• 2022

공공기관의 역사는 정치, 경제, 사회, 문화, 과학 등 다양한 학문 분야에서 한국 현대사 연구를 위한 중요한 사료일 뿐만 아니라, 학생이나 대중들이 관심을 가질 수 있는 중요한 기록콘텐츠이다. 본 연구에서는 2021년 기준으로 공공기관으로 지정된 350개 기관 중에서 정보공개포털에서 정보공개청구가 가능한 총 339개 공공기관을 대상으로 기관사(機關史) 편찬 현황을 조사하였다. 조사결과 총 326개(96.2%) 공공기관 중에서 217개(67%) 기관이 총 516건의 기관사(機關史)를 편찬한 것으로 확인되었다. 본 연구에서는 공공기관의 기관사 편찬 현황 조사결과를 바탕으로 공공기관의 역사 편찬과 이용자의 활용 측면에서 편찬 시기, 대상 기간, 주관 부서, 예산 및 소요기간, 접근성, 규정 등 6개 요소를 중심으로 분석하고 개선 방안을 제안하였다.