유전 알고리즘을 이용한 구형 마이크로스트립 패치 안테나 설계 ( Rectangular Microstrip Antennas Design Using Genetic Algorithms )

서호진,이권익,홍성욱,김흥수 한국통신학회 1998 한국통신학회 학술대회논문집 Vol.17 No.2

유기재배 배 과수원에서 그물망과 정향유 처리가 큰검정풍뎅이 방제에 미치는 영향

서호진,최으뜸,송장훈,Seo, Ho-Jin,Choi, Eu Ddeum,Song, Janghoon 한국응용곤충학회 2019 한국응용곤충학회지 Vol.58 No.2

본 연구는 배 유기재배 과수원에서 그물망과 정향유물을 처리하였을 때 큰검정풍뎅이에 의한 잎 피해를 예방할 수 있는지 확인하고자 수행되었다. 2017년 6월 하순에 보성과 함평의 배 과수원에서 그물망, 그물망 + 정향유, 무처리구 등 3처리구를 두고 큰검정풍뎅이 밀도와 잎 피해율을 조사하였다. 또한 그물망 설치 위치를 달리하여 과수원 외부, 평덕시설의 상부, 평덕시설의 하부에 그물망을 설치하여 포획된 성충 개체수를 계수하였다. 그 결과 그물망 처리구에서 20.4~34.7%, 그물망 + 정향유 혼합처리구에서 21.1~38.1% 수준으로 무처리구보다 낮은 성충수가 포획되었다. 또한 그물망 설치위치에 따른 포획 개체수는 수관하부 설치구 대비 과수원 외곽은 10.9~14.3배, 수관 상부는 5.1~9.1배로 더 많이 포획되었다. 처리구별 잎 피해율을 조사 한 결과 두 지역 모두 무처리구와 비교하여 유의적으로 그물망, 그물망 + 정향유 처리구에서 잎 피해율이 낮았다. 따라서 큰검정풍뎅이에 의한 잎 피해를 예방하기 위해 그물망을 외곽에 처리하는 것이 실용적 대안이라고 판단된다. The purpose of this study was to investigate whether leaf damage in pear orchards caused by large black chafer beetles can be controlled through net traps and clove oil treatment. In June 2017, we measured large black chafer beetle population density and leaf damage rates in two orchards, located in Boseong and Hampyeong, under three treatments: net, net plus clove oil, and control. In order to evaluate the effect of net position on the adult beetles, nets were placed outside the orchard and along the upper and lower parts of a horizontal trellis. The adult beetle population density was 20.4 to 34.7% lower in the net alone treatment, and 21.1 to 38.1% lower in the combined net and clove oil treatment than in the control. The adult beetle population density was 10.9-14.4 times higher outside the orchard and 5.1 to 9.1 times higher in the upper parts of the horizontal trellis than in the lower parts of the horizontal trellis. Leaf damage under both the net only and net plus clove oil treatments was significantly lower than that in the control at both sites. Therefore, intensive net installation around orchards may be a practical organic alternative to prevent leaf damage caused by large black chafer beetles.

Model based on temperature parameters predicts optimal harvest date for ‘Whasan’ Asian pear

서호진,Po-An Chen,Jang Hoon Song 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.5

The optimal harvest date for ‘Whasan’ pears ( Pyrus pyrifolia ‘Whasan’), which is diffi cult to predict, is currently determinedon the basis of fi eld observations of fruit quality. To create better models for predicting pear maturation, we utilized fl oweringperiod data from the Pear Research Institute, South Korea; commercial harvest data; and daily meteorological informationfrom 2007 to 2011 to assess fi ve temperature-related parameters for inclusion in the models: (1) daily mean temperature; (2)daily maximum temperature; (3) daily minimum temperature; (4) average of the daily mean temperature and daily maximumtemperature; and (5) average of the daily mean temperature, daily maximum temperature, and daily minimum temperature. We used these parameters and the minimum coeffi cient of variation method to estimate the base temperature and constructfi ve temperature-based models for predicting harvest date. Data from 2015 to 2016 were used to evaluate the performanceof these models, as assessed by average absolute deviation, average squared error, and average absolute percentage error. Using the average of the daily mean and maximum temperatures as the variable input temperature and 9.4 °C as the basetemperature, we obtained the most accurate prediction of the optimal pear harvest date. Our model indicates that the optimalharvest date for ‘Whasan’ pear occurs at 2370 accumulated growing-degree days after full bloom.

유전자 알고리즘을 이용한 구형 마이크로스트립 안테나 설계

서호진,홍성욱,김흥수 濟州大學校 情報通信硏究所 1998 情報通信硏究所論文集 Vol.1 No.-

This paper presents how to optimize rectangular microstrip antennas using genetic algorithms. Genetic algorithms are global numerical-optimization methods. patterned after the natural processes of genetic recombination and evolution. Rectangular microstrip antennas is analyzed by all parameters of the improved transmission-line model. The algorithms encode each parameter which is the width. length and thickness of the patch, the width of the feed line and the thickness of the dielectric into binary sequences, called a gen. and a set of genes is a chromosome. These chromosome undergo genetic operators to arrive at the final optimal solution for the design of rectangular microstrip antennas. Genetic algorithms determine the parameters of rectangular microstrip antennas to yield the maximum antenna gains. Simulation results obtain antenna gains of 5.3dB. The genetic algorithm proves to be better than general algorithms

품질 4.0: 개념, 요소, 수준 평가와 전개 방향

서호진,변재현,김도현 한국품질경영학회 2021 한국품질경영학회 학술대회 Vol.2021 No.-

4차 산업혁명의 출현으로 기업은 제품개발과 설계, 제조 프로세스의 운영과 개선에 큰 변화를 겪고 있다. 품질분야도 4차 산업혁명 시대에 진입하여 머신러닝, 인공지능, 블록체인 등의 기술로 큰 영향을 받고 있으며, 이 시대에 필요한 품질의 개념으로 품질 4.0이라는 용어가 등장하게 되었다. 품질 4.0은 품질관리에 4차 산업혁명 기술을 적용하는 것으로, 공정을 디지털화하여 기업이 더 나은 의사결정을 할 수 있도록 한다. 본 연구에서는 품질 4.0의 효과적인 도입을 위해 품질 4.0의 개념을 정리하고, 품질 4.0의 요소를 정리하여 핵심 요소를 선정하였으며, 효과적으로 전개하기 위한 단계별 수준을 제시하였다.

품질 4.0: 개념, 요소, 수준 평가와 전개 방향

서호진,변재현,김도현 한국품질경영학회 2021 품질경영학회지 Vol.49 No.4

Purpose: This article aims 1) to propose Quality 4.0 concept through surveying related literature, 2) to suggest key elements of Quality 4.0 by arranging the elements of Quality 4.0 that appeared in the literature, 3) to determine the levels of Quality 4.0, and 4) to suggest ideas for effective deployment of Quality 4.0. Methods: Eleven papers or documents are reviewed for Quality 4.0 concept; two papers and one document are investigated for key element extraction of Quality 4.0; and smart factory roadmap and industry 4.0 maturity model are studied to determine the levels of Quality 4.0. Results: 1) Quality 4.0 definition is proposed. 2) Three key elements are determined: data acquisition and analytics, connection and integration, and leadership and culture. 3) Six Quality 4.0 levels are determined. 4) Some suggestions are addressed for effective deployment of Quality 4.0. Conclusion: 1) Definition, key elements, levels, and some suggestions on effective deployment of Quality 4.0 are addressed. 2) Specific contents of Quality 4.0 education and training courses should be provided in the future. 3) Two future research directions are proposed.

대만의 감 산업과 재배 현황

서호진,최으뜸,송장훈,마경복,조예슬,I-Ju Chen,양상진 한국국제농업개발학회 2020 韓國國際農業開發學會誌 Vol.32 No.4

1. 감은 대만의 경제 과수 작물 중 하나로 세계 8위의 생산국이다. 1990년 재배면적은 1,650 ha 정도 였으나, 이후 빠르게 증가하여 2010년에는 5.348 ha로 약 20년 동안 3.2배 이상 늘었다. 2. 현재 떫은감의 재배면적은 약 1,000 ha 정도이고, 단감의 재배면적은 약 4,400 ha를 차지하고 있다. 생산량은 2000년까지는 평균 1.5~2.5만 톤 수준이었으나 2010년대 이후에는 평 균 6.7만 톤으로 3배 이상 증가하였다. 3. 최대 주산지는 타이중(Taizhong, 3,413 ha)으로 전체 생산 량의 약 67%를 차지하며, 기타 주산 지역은 자이(Chiayi, 469 ha), 미아오리(Miaoli, 473 ha), 신주(Hsinchu, 274 ha) 등으로 해발 800~1,100 m 이상의 산간 지역에서 재배되고 있다. 4. 대만 감의 출하 시기는 9월~12월 사이이나, 9~10월에 집 중하여 출하되고 있다. 9~10월에는 ‘Syh Jou’, ‘Bovine Heart’ 등 떫은감, 11~12월에는 ‘부유’, ‘차랑’, ‘화어소’ 등 단감 품종이 출하되고 있다. 5. 2010년 이후 감 생산량 증가에 따라 수입량은 줄어들고 있으며, 수출량은 늘어나고 있다. 주요 수입국은 일본, 뉴질랜드이며, 수출은 중국 홍콩 위주의 아시아지역을 대상으로 하고 있다. 6. 대만에서 감의 연구는 초기에는 재배 적지 선정과 떫은 감 품종의 탈삽을 위한 연구가 수행되었으며, 최근에는 조생종 품종 육성을 위한 연구가 수행되고 있다. Persimmon is one of Taiwan's economic fruit crops. Taiwan is the 8th largest persimmon producer in the world, and its cultivation area markedly increased from about 1,650 ha in 1990 to 5,348 ha in 2010, 3.2 times increase over 20 years, but no significant change during the last 10 years. Astringent persimmons occupy about 1,000 ha of the acreage and sweet persimmons about 4,400 ha. Its tonnage averaged 1.5 to 2.5 metric tons until 2000, but since then increased to about 6.7 metric tons. The major producing district is Taichung (3,413 ha) which comprises 67% of total persimmon cultivation areas. The other main producing districts, mountainous areas of 800~1100 meters or more above sea level, include Chiayi (469 ha), Miaoli (473 ha), and Hsinchu (274 ha). Of the persimmon fruits, astringent varieties such as ‘Syh Jou’ in and ‘Bovine Heart’ are circulated mainly in September to October, and the sweet ones such as ‘Fuyu’, ‘Jiro’ and ‘Hanagosho’ in November-December. Since 2010, the increase in the domestic persimmon production has led to its decreased import volumes and the expanded export volumes. The fruits, mainly, are imported from Japan and New Zealand, and the exported to Asian countries including China and Hong Kong. Research on Taiwanese persimmons was initially focused on selecting a suitable cultivation site and removing astringency after harvest for astringent persimmon varieties, and recently breeding early-growing varieties for earlier harvest and encouraging exports.

합성목재의 난연성 확보를 위한 혼합물 실험계획 사례

서호진,권민서,이건명,주혜진,변재현 한국품질경영학회 2022 품질경영학회지 Vol.50 No.1

Purpose: This paper addresses a case study of developing a flame retardant wood-plastic composites (WPC) by adding tannic acid to the existing synthetic wood. The optimal mixing ratios of six components are explored to minimize the burning time using two mixture designs. Methods: In the preliminary experiment, six components are considered to find important components and their ranges. Seven D-optimal mixture design points are generated. Two points are removed for the balance of plastic components to be maintained, and the remaining five points are augmented with two basic compositions. Four components are selected to be considered in the main experiment. In the main experiment, pellets are extruded at the eight mixture design points. In-house testing of burning time is executed three times. Specimens made of pellets from two promising flame retardant compositions are sent to the accredited laboratories and tested. Results: The test results are as follows: 1) The best composition (Wood flour, Tannic acid, PE, Lubricant) = (25, 41, 10, 2) (wt%) shows the burning time of 1 second, which is 9-fold improvement compared to the the burning time of 9 seconds from the existing composition (58, 0, 10, 2) (wt%). 2) The second best composition (41, 25, 10, 2) (wt%) results in the burning time of 2 seconds. This composition is inferior to the best composition in terms of the flame retardancy, but more economical since it needs less tannic acid ratio which is 100-fold expensive than the wood flour. Conclusion: Flame retardant compositions are found by adding tannic acid to the existing WPC employing optimal mixture designs. This case study will be helpful to practitioners who try to develop new products with additional physical properties with as small number of experimental trials as possible. Future research direction includes exploring conditions which satisfy both performance level and cost limitation simultaneously.

품질 4.0의 핵심 요소, 수준평가와 전개방향

서호진,김도현,변재현 대한산업공학회 2022 대한산업공학회 추계학술대회논문집 Vol.2022 No.11

국내 주요 재배 매실 품종의 항산화 활성

서호진,임순희,송장훈 한국유기농업학회 2018 韓國有機農業學會誌 Vol.26 No.3

본 연구에서는 국내 주요재배 매실 품종의 총 페놀, 플라보노이드 함량과 항산화 효과를 확인하고자 하였다. 총 페놀 함량은 64.13-93.43 mg ․ 100g-1으로 품종 간 함량에 차이가 있었다. 이 중 ‘앵숙’과 ‘단아’의 함량이 비교적 높게 나타났다. 또한 총 플라보노이드 함량을 측정한 결과 6.16-18.57 mg ․ 100g-1으로 총 페놀과 같이 품종 간에 유의적인 함량 차이를 보였다. 이 중 ‘고성’에서 가장 높은 함량을 보였다. DPPH 라디칼 소거활성을 측정한 결과 ‘남고’, ‘회향실’, ‘장속’, ‘단아’, ‘앵숙’에서 모두 50% 이상 비교적 강하게 나타났다. ABTS 라디칼 소거활성 측정 결과 모든 품종에서 80% 이상으로 전체적으로 높은 소거할성을 보였다. 이 중 ‘앵숙’이 가장 높은 소거활성을 보였다. 아질산염 소거 능력은 모든 품종에서 50% 이상의 높은 소거능력을 가지고 있는 것으로 확인 되었는데 이중 ‘남고’(76.03%), ‘고성’(70.56%), ‘양로’(70.32%)에서 70% 이상으로 비교적 높은 소거 활성을 보였다. This study examined the total phenolic and flavonoid compounds, and the antioxi dant activity of major cultivars of Prunus mume in Korea. The total phenolic content ranged from 64.13 to 93.43 mg · 100 g-1, with the content in ‘Osuku’ being higher than that in the other cultivars; a difference in the content among cultivars was observed. The total flavonoid content was 6.16~18.57 mg·100 g-1, showing a significant difference, with the highest content being noted in ‘Gojirou’. The DPPH radical scavenging activity was measured and was relatively high for Nanko, Kamakami, Natsuka, Dana, and Osuku cultivars. When ABTS radical scavenging activity was measured, all the cultivars showed a scavenging activity over 80%, with the scavenging activity of ‘Osuku’ being the highest. With respect to nitrite scavenging ability, all cultivars exhibited a high scavenging activity of over 50%, with the highest activity observed for ‘Nanko’ (76.03%), ‘Gojirou’ (70.56%), and ‘Yourou’ (70.32%). Based on the study results, it is considered that Prunus mume can be a useful resource because of various substances with functional physiological activities.