아스팔트 콘크리트의 고온변형저항 특성 측정방법 개발

김광우,이문섭,김중렬,이순제 강원대학교 부설 석재복합신소재 제품연구센터 2002 석재연 논문집 Vol.7 No.-

본 연구는 정하중하에서 아스팔트 혼합물의 소성변형 저항특성을 측정할 수 있는 새로운 시험방법을 개발하기 위하여 수행되었다. 2가지 골재(편마암, 화강암)와 6가지 아스팔트(일반아스팔트, 5가지 개질 아스팔트)를 사용하여 총 12개의 밀입도 혼합물을 제작하였다. 마샬 배합설계를 통해 최적아스팔트 함량을 구하고, 결정된 최적아스팔트 함량으로 마샬공시체(S=10 cm)와 자이레토리 공시체(S=15cm)를 제작하여 마샬안정도시험, 휠 트랙킹 시험, 개발된 김테스트(Kim -test)를 수행하였다. 김테스트는 공시체와 하중봉을 지지할 수 있는 김시험장치(Kim tester)를 이용하여 하단이 반경(r) 0.5 또는 1.0cm로 원형절삭한 직경(D) 3cm, 4cm의 하중봉을 사용한다. 또한 재하는 마샬 하중재하 장치를 사용하여 공시체를 60℃ 수조에 30분동안 수침시킨 후 실시되었다. 정하중은 공시체의 직경방향이 아닌 축 방향으로 50 mm/min가 가해졌고, 최대하중(P_max)과 수직변형(y)이 측정되었다. 마샬안정도시험과 간접인장강도시험에서 얻어지는 것과 유사한 곡선이 각각의 시험에서 얻어졌다. 강도값은 P_max, r, y 및 H(=D-2r)을 이용한 K_D=4P_max/π(H+2√(2ry-y^2))^2식을 통하여 계산하였고, 이를 변형강도(kgf/㎠)로 정의하였다. 실험결과, 공시체 직경이나 골재종류보다는 하중봉과 하중봉 하단의 원형처리 여부가 K_D와 P_max 값에 영향을 미치는 것으로 나타났다. 통계분석결과에서 K_D가 소성변형 깊이와 동적 안정도에 높은 상관성을 보였다. 향후 연구를 통해 K_D의 유효성이 검증된다면, Kim-test는 아스팔트 혼합물의 소성변형 저항성을 판단할 수 있는 시험방법으로 사용될 수 있을 것이다. This study dealt with developing a new approach for finding properties which might represent rut resistance characteristics of asphalt mixture under static loading. Two aggregates, a normal asphalt (pen 60-70) and 5 PMAs were used in preparation of 12 dense-grade mixtures. Marshall mix design was used in determination of the optimum asphalt content (OAC) and each mixture at the OAC was prepared for a newly-developed Kim test on Marshall specimen (S=10 cm) and gyratory specimen (S=15cm), and for wheel tracking test. Kim test used Marshall loading frame and the specimen was conditioned for 30min at 60℃ before loading through Kim tester, and apparatus consisting of a loading column and a specimen and column holder. Diameter (D) of column was 3cm and 4cm with each column having different radius (r) of round cut at the bottom. The static load was applied at 50mm/min in axial direction of the specimen, not in diameteral direction, and the maximum load (P_max) and vertical deformation (y) at the maximum load point were measured. A curve, similar to the one from a Marshall test or static indirect tensile strength test was obtained from each test. A strength value was calculated based on the P_max, H(=D-2r). r and y by using the equation K_D=4P_max/π(H+2√(2ry-y^2))^2 and is defined as deformation strength (kgf/㎠). The values of P_max/y and K_I=K-D/y were also calculated to see if these have any correlation with rutting. In general, D and r were significant factors affecting K_D, while specimen size was not. The statistical analyses results showed the K_D had the best correlation with rut depth and dynamic stability. The next best correlation was found from P_max which was followed by P_max/y and K_I in order. Therefore, K_D can be used for selecting the highly resistable asphalt mixture against permanent deformation.

溫室保溫커튼의 材料特性에 따른 保溫效果分析

金榮福,金容換,李昇揆,金成泰,羅又禎,閔永鳳,朴重春,崔東烈 慶尙大學校 1991 論文集 Vol.30 No.2

The effects of the material properties of thermal curtains upon reduction of the greenhouse heat loss were studied. A theoretical analysis procedure with equations and computer programs was developed to estimate them by using energy balance principles. Curtain effectiveness for every three kinds pf value level of the material properties were studied and compared. The results of this study would be useful for the developent and management of greenhouse thermal curtains.

敎養課程으로서의 「人口와 未來」開設 및 運營에 관한 實驗硏究 : 梨花女子大學校를 中心으로

康宇哲,徐洸善,田贊和,金在恩,蘇興烈 이화여자대학교 한국문화연구원 1979 韓國文化硏究院 論叢 Vol.33 No.-

This is a research report of the research that led to the opening of a population education course at Ewha Womans University. The research itself may be divided into the following four parts: planning for the research ; preparatory work for a population education course; opening of a population course; and evaluation of the population course. In the first stage of the research, the work, as usual, consisted of organizing the research team, setting up the research objectives, planning the research schedule, etc. The project began in the Fall of 1974, and concluded in the Fall of 1978. In the second stage of the research, the work was carried out for the preparation of a course in population education. Several sessions of faculty conference, in which more than 40 professors from various fields of specialization participated, were held in order to determine the specific objectives of the proposed course, to draw up a syllabus, and to prepare for a textbook for the course. When a rough sketch of the syllabus, and the contents of the course was made a student group was organized to examine and evaluate it. In the third stage of the research, a population education course titled "Population and Future" was opened as an elective course in the general education curriculum. This was in the Fall of 1875, and the course remained open every semester until now. An anthology with the same title as the course itself was used for reading, and the teaching was carried out as a team teaching by a team of 6-9 professors. In the fourth stage of the research, an evaluative study was taken up in order to evaluate the course with regard to its structure, textbook, teaching method, and its contents, as well as to assess the effectiveness of the course on terms of the students' change in their cognitive and emotive or attitudinal response to population problem.

Validation Study of Kim's Smoking Cessation Motivation Scale and Its Predictive Implications for Smoking Cessation

Park, Jae Woo,Chai, Sukhi,Lee, Ju Yul,Joe, Keun-Ho,Jung, Jo Eun,Kim, Dai Jin Korean Neuropsychiatric Association 2009 PSYCHIATRY INVESTIGATION Vol.6 No.4

<P><B>Objective</B></P><P>The purpose of this study was to develop a scale to measure motivation for smoking cessation. Motivation is known to be important for success of smoking cessation. The reliability of the scale was assessed and its predictive validity for smoking cessation was evaluated.</P><P><B>Methods</B></P><P>We recruited 333 men aged 20 to 70 that visited smoking cessation clinics at seven public health centers. The demographic characteristics were recorded and the Korean version of Stages of Readiness for Change and Eagerness for Treatment Scale for Smoking (K-SO-CRATES-S) performed. A smoking cessation motivation scale was developed with 10 questions based on the theory of motivation enhancement therapy.</P><P><B>Results</B></P><P>The motivation scale was composed of four subscales based on the factor analysis; each subscale had an adequate degree of internal consistency. In addition, the newly developed scale had a high degree of validity based on its significant correlation with the smoking version of SOCRATES. Moreover, the precontemplation level of motivation was found to significantly predict the success of smoking cessation. And one of the subscales of the Korean Nicotine Dependence Syndrome Scale (K-NDSS), stereotypy which also significantly predicted the success of smoking cessation, significantly correlated with the preparation 1 and 2 level of motivation.</P><P><B>Conclusion</B></P><P>The smoking cessation motivation scale with 10 questions that was developed in this study was a highly reliable and valid scale for the prediction of success for smoking cessation for those who wanted to stop smoking.</P>

Hydrogen for the Future Green Energy

( Ha Suck Kim ),( Sung Yul Bong ),( Seung Hee Woo ) 경남대학교 신소재연구소 2012 신소재연구 Vol.24 No.-

Many agree that the future energy will be hydrogen after the recent energy crisis which brought us to reconsider seriously about possible alternatives after fossil fuel for mankind. There are abundant sources for hydrogen-water, and it burns to form water. However, in order for us to adopt the new energy system, many hurdles have to be overcome. They are how to produce hydrogen economically, ways to store and transport safely, and ways to generate electricity efficiently, to name a few. Electrochemical generation of hydrogen needs a high overvoltage, thus, it is a very expensive way at the moment. Also, storage and transport require many fundamental researches. Efficient use of hydrogen is fuel cell. Fuel cells have been received a considerable interest as power sources because they exhibit high energy efficiency and are environmentally friendly. Despite these advantages, fuel cells in general need to overcome economic barriers for wide applications. Main barriers are the cost of materials such as platinum used in catalysts and proton conducting polymer. Catalysts are the core material for fuel cell and many attempts have been made to find out the most active, efficient and durable formulae in the MEA preparation step.[1-2] In this respect, works performed in our group for fuel cell catalysts will be summarized, they are preparation of by galvanostatic pulse electrodeposition on Nafion-bonded carbon layer [3-5], and effect of carbon supports for catalysts. Improved catalytic performance by choosing appropriate flow channels in the support was also observed. Also in this presentation, energy statistics and efficient way of use energy, possible future energy scheme will be discussed. [1] Hubert A. Gasteiger, Shyam S. Kocha, Bhaskar Sompalli, Frederick T. Wagner, Applied atalysis B: Environmental56(2005)9-35. [2] Seunghee Woo, In Kim, Jae Kwang Lee, Sungyool Bong, Jaeyoung Lee, Hasuck Kim, Electrochim. Acta, 56(2011) 3036-3041. [3] Youngmi Ra, Jaeseung Lee, In Kim, Sungyool Bong, Hasuck Kim, J. Power Sources, 187, 363-370 (2009). [4] J. Lee, Kookil Han, Hasuck Kim, J.PowerSources, 163(2006)349-356. [5] Sungyool Bong, Yang-Rae Kim, Seunghee Woo, Sunghyun Uhm, Jaeyoung Lee and Hasuck Kim, Electrochem. Commun., 12, 129-131 (2010).

Insect diversity in Korea

Hong-Yul Seo,Tae-Woo Kim,Ki-Gyung Kim,Tae-Wha Kang,Seon-Yi Kim,Jinhan Kim 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04

The Ministry of Environment in Korea published 'The Compilation of National List of Indigenous Insect Species of the Korean Peninsula' in 1996 including 11,853 species. The National Institute of Biological Resources (NIBR) originally compiled the national species list of insects to establish a national inventory of endemic biological assets with the joined efforts from all distinguished Korean taxonomists since 2008. For the convenience of scores of professional taxonomic groups participating in the project concurrently, the NIBR has developed the NIBR inventory description method and inventory system from 2008 to 2016. For nine years in this study, the NIBR has established the national insect inventory of 16,558 species including Collembola. The insect fauna of the Korean Peninsula comprises 565 families from 30 orders. The largest orders are Coleoptera (110 families, 4,318 species), Lepidoptera (67 families, 3,733 species), Hymenoptera (61 families, 3,151 species), Hemiptera (88 families, 2,013 species) and Diptera (79 families, 1,944 species). The fractions of the main insect orders in the fauna of the Korean peninsula correspond to those in the Holarctic temperate zone. And totally 13 volumes of national list of insect species in Korea were published.

The first records on Cinara cuneomaculata (Del Guercio), C. largirostris Zhang G. & W. Zhang, C. smaragdina (Pashtshenko) and C. piceae (Hemiptera: Aphididae) in Korea

Hong-Yul Seo,Ki-Gyung Kim,Mi-Jeong Jun,Tae-Woo Kim,Sun-I Kim,Hyojoong Kim,Seunghwan Lee 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.10

The genus of Cinara (Aphididae: Lachninae) live on the roots, trunk, branches, twigs, shoots or foliage of Coniferae and can be easily distinguished in having the very big body, apterae up to 5-6 ㎜ in length and short antennae which are shorter than half the body length. Most of species are monoecious without host alternation and attended by ants. Based on body appearance and COI gene sequence, we report Cinara cuneomaculata (Del Guercio) on Larix kaempferi, C. largirostris Zhang G. & W. Zhang on Pinus thunbergii and P. dnesiflora, C. smaragdina (Pashtshenko) on Abies holophylla and C. piceae on Juniperus rigida, for the first time in Korea.

Isolation and structure determination of meroterpenoid derivatives from Sargassum macrocarpum

Ji-Yul Kim,Jeong Min Lee,Hyun-Soo Kim,Seok-Chun Ko,Mi-Jin Yim,Gun-Woo Oh,Kyung Woo Kim,Chul Hwan Kim,Kyung Lee,Kyunghwa Baek,Dae-Sung Lee 한국수산과학회 양식분과 2023 한국수산과학회 양식분과 학술대회 Vol.2023 No.6

A Novel Approach To Develop Biopesticides Based On Entomopathogenic Fungi

Jae Su Kim,Eun Ok Woo,Jong Sung Park,Yun Sung Kim,Tae-Joon Kim,Kyoung-Sung Kim,Jong Yul Roh,Jae Young Choi,Yeon Ho Je 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.05

Among the cultured products of Beauveria bassiana SFB-205 (KCCM 10892P), the supernatant showed the highest insecticidal activity against 2nd instars of Aphis gossypii (Aphididae) nymphs under glasshouse condition. The enzymes in the supernatant were confirmed as active materials, and the chitinase was finally selected as a QC factor for commercial production. However, the chitinase activity in the supernatant decreased by 11-folds due to the thermal stress at 50℃ for 2 h. To obtain thermal stability, the chitinase in the supernatant was adsorbed to a precipitable material and the pellet was freeze-dried (PCT/KR2007/005886). The adsorbent-A showed about 92.7% of harvesting efficiency which was higher than the other candidates. The chitinase activity of the freeze-dried powder was kept up about 82.0% of initial activity for the same thermal stress. Subsequently, an optimal formulation recipe was established to maximize long-term storage stability and efficacy. SFB-205 oil-based formulation was stable up to 18 months at room temperature. It showed 96.1% efficacy against 2nd instars of A. gossypii nymphs at 1 day after the treatment in the glasshouse. This novel approach can be a promising method to develop competitive biopesticies in the entomopathogenic fungi, even though it needs to be intensively studied.

A Hand Gesture Recognition Sensor Using Reflected Impulses

Kim, Seo Yul,Han, Hong Gul,Kim, Jin Woo,Lee, Sanghoon,Kim, Tae Wook IEEE 2017 IEEE SENSORS JOURNAL Vol.17 No.10

<P>This paper introduces a hand gesture recognition sensor using ultra-wideband impulse signals, which are reflected from a hand. The reflected waveforms in time domain are determined by the reflection surface of a target. Thus every gesture has its own reflected waveform. Thus we propose to use machine learning, such as convolutional neural network (CNN) for the gesture classification. The CNN extracts its own feature and constructs classification model then classifies the reflected waveforms. Six hand gestures from american sign language (ASL) are used for an experiment and the result shows more than 90% recognition accuracy. For fine movements, a rotating plaster model is measured with 10 degrees step. An average recognition accuracy is also above 90%.</P>