라덱스 혼입률에 따른 철근콘크리트의 휨파괴 거동특성

정원경,김동호,이주형,임홍범,윤경구 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

Reinforced concrete(R/C) is commonly used to structures because they have many merits that compressive strength, economy and so on. However, reinforced concrete has a crack at the tensile section which is due to the relatively lower tensile strength than its compressive strength. Latex modified concrete(LMC) has higher tensile and flexural strength than the ordinary portland cement, due to the interconnections of hydrated cement and aggregates by a film of latex particles. The purpose of this study was to investigate the flexural behavior of reinforced concrete beam with latex modified concrete, having the main experimental variables such as concrete types(ordinary portland cement concrete, latex modified concrete), latex contents(0%, 15%), flexural steel ratios(0.012, 0.0235), and with/without shear reinforcement. The beam of LMC showed considerably higher initial cracking loads and ductility than that of OPC, but, similar to ultimate strength and deflection. This might be attributed to the interlocking of hydrated cement and aggregates by a film of latex particles, water retention due to hydrophobic, and colloidal properties of the latexes resulting in reduced water evaporation. The beam with latex modified concrete could be adopted at field for controlling and reducing the tensile crack due to its higher tensile strength.

軟弱地盤上에 築造된 農業用貯水池 堤體의 壓密擧動

오범환,이달원,임성훈 충남대학교 농업과학연구소 2002 농업과학연구 Vol.29 No.2

본 연구는 연약지반상에 축조되는 농업용 저수지의 압밀거동을 현장계측결과를 기초로 기존의 예측방법등과 비교분석하고, 시공중 또는 완공후에 측방유동등으로 인하여 국부적인 전단파괴 가능성을 현장계측치로부터 정량적으로 파악하여 비교분석한 결과 다음과 같은 결론을 얻었다. 1. 최종 예상침하량으로 추정한 압밀도는 Terzaghi 방법에서는 작게 추정되었고, 편차가 크게 나타나서 오차범위가 작은 Asaoka와 Hyperbolic방법을 기준으로 압밀도를 적용하는 것이 합리적이라고 판단된다. 2. 성토에 의한 점증재하시 과잉간극수압의 소산은 성토시공중의 소산과 최대간극수압 이후의 소산이 합성되어 발생하는 복합적인 거동을 나타냈다. 또한 압밀초기에는 침하량으로 압밀도를 예측하는 것보다 계측자료가 충분한 과잉간극수압을 이용하여 압밀도를 예측하는 것이 신뢰성이 클 것으로 판단된다. 3. 성토완료후 초기에는 시공중 소산된 과잉간극수압(U_(d))을 이용한 압밀도가 최대과잉간극수압을 이용한 압밀도(U_(p))보다 12∼27% 정도 더 크게 나타났고, 침하량으로 추정된 압밀도에 근접하므로 소산된 과잉간극수압에 의하여 압밀도를 추정하는 것이 합리적이라고 판단된다. 4. U_(d)와 U_(p)의 관계식은 주계측 단면에서는 U_(d)=(1.3∼3.6)U_(p), 부계측 단면에서는 U_(d)=(1.2∼1.9)U_(P)로 소산된 과잉간극수압으로 추정된 압밀도가 더 크게 나타났다. 또한 저수지 제체의 안정성을 한계평형법에 의해 분석한 결과 모든 조건에서 기준 안전율보다 커서 안정한 상태로 나타났다. This study was performed to evaluation the consolidation behavior of agricultural reservoir in the very soft ground. The final settlement prediction methods by Terzaghi, Hyperbolic and Asaoka methods were used to compare with the degree of consolidation estimated by exess pore water pressure. The dissipated excess pore water pressure during embankment construction and peak excess pore water pressure on the completed embankment were suggested for the estimation of the degree of consolidation. It was concluded that the degree of consolidation estimated from dissipated excess pore water pressure was more reliable than that from the peak excess pore water pressure. The stability methods for agricultural reservoir was used to compare and analyze with various condition by limit equilibrium method.

조직특성과 개인특성이 조직시민행동에 미치는 영향에 관한 연구 : Focused on the Government Sponsored Research Institutes(GSRI) 정부출연 연구기관을 중심으로

정범구,오원혜 충남대학교 경영경제연구소 2002 경영경제연구 Vol.25 No.1

과학 기술계의 환경이 급변화 함에 따라 정부출연 연구기관의 기능 및 역할의 재정립과 연구개발투자의 효율성의 제고를 위한 논의가 활발히 전개되고 있다. 이에 따라 정부는 여러 가지 정책을 수립하고 시행하고 있지만 이는 전략관리, 조직 및 지원관리, 연구관리 등 공식관리시스템에 영향을 주는 것들이었다. 그보다 정부출연 연구기관의 구성원 한사람 한사람의 태도, 의식, 자신감 등 근본적인 문제를 변화시켜 나가는 것이 중요하다고 생각된다. 본 연구에서는 정부출연 연구기관에 종사하는 구성원들의 업무적인 공적 관리시스템 이외의 업무외적인 자발적 역할외 행동(extra-role behavior)이라 할 수 있는 조직시민행동(Organizational Citizenship Behavior : OCB)에 대해 연구해 보고자 한다. 이를 통해 정부출연 연구기관에 종사하는 모든 개인에게 조직에서 생활하는 자세 등을 긍정적으로 바꿀 수 있는 계기를 마련하고 기관의 관리자인 경영층 입장에서도 조직특성을 어떻게 변화시켜야 조직 구성원들의 개인특성과 조화를 이루어 조직 전체가 이 변화무쌍한 과학기술의 터에서 발전할 수 있는지를 연구하였다.

의료영상저장 전송시스템과 측두골 3차원 영상합성을 이용한 중이 수술에서의 임상적 유용성

전범조,여상원 최신의학사 2004 最新醫學 Vol.47 No.1

과학교사들의 과학철학적 관점이 중학생들의 과학의 본성 개념에 미치는 영향

소원주,김범기,우종옥 한국교원대학교 과학교육연구소 1998 청람과학교육연구논총 Vol.8 No.1

과학적 소양에는 과학의 본성에 대한 적절한 이해를 함의한다. 그러나 학생들의 과학의 본성 개념에 영향을 줄 수 있는 요인에 대해서 알려진 것이 별로 없다. 본 연구의 목적은 과학교사들의 과학철학적 관점이 그들이 가르치는 학생들의 과학의 본성 개념에 직접적으로 영향을 미칠 것이라는 가정에 대한 타당성을 검토하는 것이다. 본 연구에서 과학교사와 학생의 과학관을 비교하였을 때, 과학교사들의 과학의 관점이 학생들의 과학의 본성 개념에 영향을 줄 것이라는 연구 가설은 기각되었다. 즉, 본 연구의 자료에 의하면, 교사들의 과학의 관점과 학생들의 과학의 본성 개념 사이에 아무런 유관 관계가 없었다. 이는 과학의 본성이 학생들이 요구나 교육과정 목표로써 고려되거나 교육되지 않는데 따른 귀결이다. 이 연구 결과는 중등 과학교육에서 더 한층 과학의 본성 개념 함양의 필요성을 제기하는 것이다. Scientific literacy implies an adequate understanding of the nature of science. However, little is known about factors that can influence students' conceptions of the nature of science. The purpose of this study was to test the validity of the prevalent assumption that teachers' philosophical perspectives of science directly influence their students' conceptions of the nature of science. A comparison between science teachers' and students' perspectives of science did not support the assumption that a science teachers' perspectives of science is significantly related to students' conceptions of science. The data clearly indicated that there was no relationship between teachers' philosophical perspectives and those of their students. The results convincingly indicated that the nature of science was not being considered or taught to students as a consequence of students' needs and curriculum guide objectives. It is believed that the results of this investigation will help to redirect the focus of future efforts to promote more adequate conceptions of the nature of science in our secondary schools.

TDNN과 HMM의 결합을 이용한 음성인식기 구현

서원택,조범준 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.2

A hybrid method using TDNN(Time Delay Neural Network) and HMM(Hidden Markov Model) is studied and the performance of the algorithm is obtained and compared with those of TDNN and HMM based algorithm by experiments in this thesis. The TDNN/HMM algorithm is based on the structural hybrid of TDNN and HMM. Once the outputs of the TDNN's second layer are transferred as the inputs of HMM and then the HMM is trained on each words. The algorithm organized in these way can obtain the both the good short-time classification properties of TDNN and the good time-warping properties of HMM. Above process is simulated by computer. One person's voice is used and the result is that the integration method is obtained the better performance over 5.7% to HMM based algorithm and over 3% to TDNN based algorithm.

Low Density Lipoprotein의 실측치와 계산치에 관한 조사

김언규,정재린,이경옥,서덕규,이규범 대한임상병리사협회 1993 대한임상병리사회지 Vol.25 No.1

韓國 在來山羊의 消化管 및 膵臟內 寄生蟲 調査

李鉉凡,李熙碩,崔源弼 慶北大學校 1977 論文集 Vol.24 No.-

Present study was undertaken in order to clarify the species and infection rate of internal parasites in Korean native goats. Abomasum of 100 goats slaughtered in Daejun and abomasum, intestinal tracts, and pancreata of 40 goats slaughtered in Taegu prefecture were inspected. The parasites recovered were classified morphologically with following results. 1) A total of 7 species of parasite was identified. Their habitats and infection rates were as follows; Abomasum-Haemonchus contortus: 20% in Taegu and 42% in Daejun, and Trichostrongylus sp. : 2.5% in Taegu and 3% in Daejun. Small intestine-Moniezia expansa: 12.5%. Large intesine Oesophagostomum columbianum: 27.5%, Oesophagostomum venulosum: 17.5%, and Trichuris ovis: 5%. Pancreas-Eurytrema coelomaticum: 15%. 2) Characteristic nodule formation on the walls of cecum, colon, and ileum was observed in 5 out of 11 goats infected with Oesophagostomum columbianum. No nodule formation, however, was observable in goats infected with Oesophagostomum venulosum. 3) the maximum worm burdens of Oesophagostomum columbianum, Eurytrema coelomaticum, and Haemonchus contortus were higher (above 83) than those of the other parasites. 4) the numbers of female nematodes were greater than of male except Oesophagostomum venulosum.

모 주물공장 근로자의 작업공정별 분진폭로량, 자각증상 및 건강진단판정 비교

이범식,조영채,변정식,김동현,원선혜,김정윤 忠南大學校 環境問題硏究所 1995 環境硏究 Vol.13 No.-

The relationship among dust exposure dose, special health diagnosis results and subjective symptom questionaire survey for 109 casting foundry workers supervised by a local laber office has been studied from august to october 1993. Subjective symptom, dust exposure dose and health examination evaluation of respective working processes have been analized and concluded as follows; 1. Metal fume concentration in melting process measured 3.21±1.46㎎/㎥ is under threshould limit value(TLV;5.0㎎/㎥), casting sand dust measured in molding and desanding process is 5.8 ±3.41㎎/㎥ and 9.69 ±2.64㎎/㎥ which is 3-5 times higher than TLV(2.0㎎/㎥), metal fume, welding fume and metal dust in finishing process measured 9.34 ±1.32, 13.73 ±16.97 and 10.17 ±3.50㎎/㎥ respectively, which are also 2-3 times higher than TLV(5.0㎎/㎥). 2. The complain rate subjective symptoms appeal evaluated for finishing process are 35.9%, 46.2%, 27.2% and 42.2% for eye smptoms, respiractory, skin, general symptom respectively and the rates above express the highest values and the complain rates for melting process are 24.4%, 37.5% and 35.7% for eye smptoms, respiratory and mental system respectively and for molding and desanding it is 24.3%. 3. Perceived occupational disease rate is found 0.9% with are out of 109 worker surveyed who have been exposed in metal fume of finishing process. 4. 33.0% of workers surved are found to require close examination, the worker of hepatopathy suspected are 21.4% which is the highest and 3.7% for circulatory disturbance suspected. 5. The statistically significant variables in general chracteristics that affect health examination evaluation are smoking(P<0.001), respirator put-on (P<0.05) and working career(P<0.05). 6. Cough(P<0.001), "headache"(P<0.05) and "easily skin exchange by slight stimulation" (P<0.05) are statistically significant to the subjective symptom variables affect health examination evaluation.

Identification and characterization of Metarhizium majus isolated from the edible insect Protaetia brevitarsis in Korea

Kwak Kyu‐Won,Aktaruzzaman Md.,Kim Eunsun,Kim Sun Young,Hong Seung‐Beom,Park Ji Yeong,Park Kwanho,Koo Bonwoo,Kim Yong‐Soon 한국곤충학회 2021 Entomological Research Vol.51 No.12

Edible insects are considered novel protein sources, and the edible insect breeding industry is growing rapidly. However, fungal pathogens are a major threat to this industry, and appropriate identification of causative agents is important for the development of antifungal agents. In 2019, strains of the fungal pathogen Metarhizium were isolated from infected second and third instar larvae of the economically important edible insect Protaetia brevitarsis, which were collected from separate farms in Gimhae-si, Gyeongsangnam-do, Korea. Based on morphological characteristics and multilocus phylogenetic analysis of the internal transcribed spacer region, and 50-region of gene encoding the 1-α elongation factor, the fungal strains were identified as Metarhizium majus. Here, we report the detailed phylogenetic characteristics and morphological description of this species, which is prevalent in Korea. Identification of the principal disease-causing agent can help develop disease prevention and antifungal strategies for application in edible insect-rearing farms.