This study attempts a comparison between AHP(Analytic Hierarchy Process) in which the importance weight is structured by individual subjective values and regression model with importance weight based on statistical theory in determining the importance weight of casual model. The casual model is designed by for students’ satisfaction with university, and SERVQUAL modeling methodology is applied to derive factors affecting students’ satisfaction with university. By comparison of importance weights for regression model and AHP, the following characteristics are observed. 1) the lower the degree of satisfaction of the factor, the higher the importance weight of AHP, 2) the importance weight of AHP has tendency to decrease as the standard deviation(or p-value) increases. degree of decreases. the second sampling is conducted to double-check the above observations. This study empirically checks that the importance weight of AHP has a relationship with the mean and standard deviation(or p-value) of independence variables, but can not reveal how exactly the relationship is. Further research is needed to clarify the relationship with long-term perspective.

Six Sigma is a philosophy and systematic methodology for quality improvement. It encourages continuous quality improvement efforts to achieve the ideal goal of 6σ. Sigma(σ) is a statistic representing the standard deviation of the normal distribution, and 6σ level means a level where the tolerance of the specification is six times the standard deviation of the process distribution. In terms of the defective rate, the 6σ level achieves the 0.002 defectives per one million units. However, in the field, the 6σ level is used in the sense of achieving 3.4 defects per one million opportunities, which shows a large gap from the 6σ level in the statistical viewpoint. This is because field practitioners accept a 1.5σ shift of the mean of process when calculating the defective rate under sigma level. It said that the acceptance of 1.5σ shift of the mean is from experience, but there is no research or theoretical explanation to support it logically. Although it is a non-scientific explanation based on experience, considering that there has been no objection to the 1.5σ shift for a long time and it is rather accepted, it is judged that there is a reasonable basis for the 1.5σ shift. Therefore, this study tries to find a reasonable explanation through detective power of control chart via the run-rules to the 1.5σ shift empirically recognized by practitioners.

This paper investigates the stress-reducing preventive maintenance model through numerical experiments. The preventive maintenance model is used to analyze the relationship between related conditions and variables to gain insight into the efficient operation of the system when performing preventive maintenance in real-world situations. Various preventive maintenance models have been developed over the past decades and their complexity has increased in recent years. Increasing complexity is essential to reflect reality, but recent models can only be interpreted through numerical experiments. The stress-reducing preventive maintenance is a newly introduced preventive maintenance concept and can only be interpreted numerically due to its complexity, and has received little attention because the concept is unfamiliar. Therefore, for information purposes, this paper investigates the characteristics of the stress-reducing preventive maintenance and the relationship between parameters and variables through numerical experiments. In particular, this paper is focusing on the economic feasibility of stress-reducing preventive maintenance by observing changes in the optimal preventive maintenance period in response to changes in environmental stress and the improvement factor. As a result, when either the environmental stress or the improve effect of stress-reducing preventive maintenance is low, it is not necessary to carry out the stress-reducing preventive maintenance at excessive cost. In addition, it was found that the age reduction model is more economical than the failure rate reduction model.

국립원예특작과학원에서는 2015년 거베라 신품종 ‘Red Velvet’ 을 육성하였다. ‘Red Velvet’은 2007년 10월부터 2008년 2월까지 주홍색 반겹꽃 스탠다드 거베라 ‘Rose’와 적색 반겹꽃 ‘Sabana’를 각각 모본과 부본으로 인공교배하여 얻은 187개체의 교배실생 분리집단으로부터 2008년부터 2015년까지 8년 동안의 개화 및 생육특성검정을 거쳐 선발된 절화용 스탠다드 거베라 품종이다. ‘Red Velvet’은 초세 강건한 갈색 화심의 적색(RHS R45B) 반겹꽃 대륜계통이다. 꽃의 평균 직경은 12.6±0.5cm이고, 내부설상화 및 통상화의 직경은 각각 5.7±0.3cm와 2.8±0.2cm이다. 꽃대는 꽃목직경이 상부 5.4±0.4mm, 중부 7.8±0.7mm 정도로 굵으며, 화경장은 60.0±8.1cm로 길다. 절화수명은 9.8±2.3일로 대조품종과 비슷하며, 연간 채화량은 48.3±4.8본/주로 많은 다수성 품종이다.

해충방제용 미생물 선발을 위해 2018년도에 공원·산림·유기농 근권 토양 87지점을 수집하여 갈색거저리를 이용한 insect-bait법 및 자연조건에서의 감염사충으로부터 곤충병원성 곰팡이를 132균주 분리하였다. 분리된 균주는 점박이응 애, 복숭아혹진딧물에 대한 살충활성 스크리닝을 통하여 각 해충별 살충활성을 보이는 56균주를 선발하였다. 선발된 균주들은 rDNA의 ITS영역을 이용하여 분류동정 하였다. 추가 적용범위 확대를 위해 무잎벌(종령 유충), 거세미나방류 (3~6령 유충)와 같은 지하부 이동성 해충의 방제 가능성을 탐색하기 위해 선발 곤층병원성 곰팡이의 포자 현탁액의 관주처리 방법으로 살충활성을 검정 중이다.

In the past, only one species known for Subtribe Physoderina from Korea. In this study reporting 2 genera and 2 species, Lachnoderma asperum Bates, 1883 and Physodera unicolor Ma, Shi & Liang, 2017, as new record to Korea. Taxonomic key, adult habitus, genitalia and distributional information are provided.

경기지역에 발생하는 돌발 및 남방계 해충의 발생실태 조사결과, 겨울철 경기지역 평균기온이 전년보다 3.7℃, 평년보다는 1.2℃ 낮게 경과함에 따라 포도 재배지 꽃매미 평균 월동난 부화율은 35.6%로 전년 대비 60% 감소하였음. 블루베리 재배지 갈색날개매미충의 평균 월동난 부화율은 26.9%로 전년 대비 50% 감소하였으며, 겨울철 피해가지 제거로 부화약충의 밀도는 매우 낮았음. 저온 적응성이 강한 미국선녀벌레의 경우 6월 중순 안성지역 평야 블루베리에서 약충이 가지당 최대 6.64마리 발견되었으나, 하절기 고온 등으로 성충의 밀도는 크게 감소되었음. 남방계 해충인 볼록총채벌레는 포도 재배지에서 5월 하순부터 발견되기 시작하여 7월 상순부터 급격히 증가하는 양상을 보인 가운데 지역별로는 남부지역(안성), 지대별로는 중산간지 > 산간지 > 평야지 순으로 높은 경향을 보였음.

The objective of this study was to evaluate the effect of treating dairy cattle with exogenous human chorionic gonadotrophin (hCG), five (5) days post artificial insemination (AI) on serum progesterone (P4) concentration and pregnancy rate. In this experiment, five days after AI, cows were assigned randomly to two groups namely: a) treated group (67) which were administrered with 1500 IU hCG (Chorulon) and b) control group (61), which received no treatment. On day 5, 10, 15 and 20 after the artificial insemination, blood samples from a total of 8 cows (4 from each group) were collected and were analyzed for serum P4 concentration. Cows were detected for estrus according to standing heat by visual observation. Cows that were detected still in estrus after days 18-24 were re-inseminated and recorded as not pregnant (open). Pregnancy diagnosis was conducted by ultrasonographic examination and transrectal palpation of the uterus on approximately 60 days in cows that observed to be not in estrus. The conception rate in hCG treated and control groups were 52.5 and 36.1%, respectively. The results proved that there were no significant differences in conception rate between two groups (p=0.0568). However, pregnancy rates were reduced by hCG treatment. Average serum P4 concentrations did not differ between Hcg-treated and control groups on day 5 (0.377 versus 0.375 ng/ml). On day 20 serum P4 concentrations were greater in the treated group compared with the control group (3.085 versus 2.010 ng/ml). The treatment with hCG seemed to increase P4 level compared with the control. In conclusion, the results of this study showed that 1500 IU of hCG administered on 5 day post AI increased conception rate in dairy cows. This was supported by the results on serum P4 concentration which was greater in hCG treated group.

국립원예특작과학원에서 2011년 거베라 신품종 ‘Pink Melody’를 육성하였다. ‘Pink Melody’는 2007년 10월부터 2007년 12월까지 분홍색 반겹꽃 ‘Eta’와 ‘Pascal’을 교배하여 획득한 97개체의 실생계통으로부터 2008년부터 2011년까지 4년 동안의 개화 및 생육특성검정을 거쳐 선발된 절화용 대륜 거베라 품종이다. ‘Pink Melody’는 초세강건한 녹색화심의 파스텔톤 분홍색(RHS R55D) 반겹꽃 대륜계 품종이다. 꽃은 평균 직경이 11.4±0.9cm이고, 내부설상화와 화반의 직경은 각각 7.3±0.8cm와 2.6±0.5cm, 외부 설상화의 길이와 폭은 각각 5.3±0.4cm와 1.0±0.1cm로 꽃잎이 비교적 좁고 긴 도란형이다. 꽃대는 꽃목직경이 상부 4.2±0.4mm, 중부 6.4±0.8mm 정도로 강건하며, 꽃대의 길이는 45.2±5.5cm이다. 절화수명은 10.8±1.6일로 대조품종 ‘Pascal’보다 약 1.5일이 길며, 연간 채화량은 52.9±4.3본/주로 대조품종보다 5.0본/주 많은 다수성 품종이다.

Subsurface cavities in the asphalt pavement which can cause road depression and cave-in accidents influence on the safety of pedestrians and vehicle drivers in the urban area. The existence of subsurface cavity can increase the tensile strain at the bottom of asphalt layer which is an indicator of fatigue cracking potential, and leads to the weakening of the pavement structural capacity. In this study, the finite element (FE) analysis was conducted to examine the relationship between the critical pavement responses and influencing factors, such as cavity depth and size, asphalt layer thickness, and asphalt concrete modulus. The surface deflections and tensile strains calculated from the ABAQUS FE program were compared to those from ILLIPAVE. It is found from this comparison that there are a good relationship between two analysis results. A three dimensional finite element model which is essential to simulate the hexahedral cavity were used to generate the synthetic database of critical pavement responses. To validate the developed model, the deflection data obtained from field Falling Weight Deflectometer (FWD) testing in four different locations were compared to FE deflections. It is found that the center deflections obtained from the FWD testing and FE analysis are similar to each other with an error values of 2.7, 4.4, 5.5, and 11.9 % respectively. The FE model developed in this study seems to be acceptable in simulating actual field cavity condition. On the basis of the data in the database, various analyses were conducted to estimate the effect of influencing factors on the critical pavement responses. It was found that the tensile strain at the bottom of asphalt layer is affected by all the factors but the most affected by the cavity depth and asphalt concrete modulus. Further studies are recommended to properly account for the effect of cavity’s geometry to pavement response.

Until now, 12 subspeceis of Eucarabus (Parhomopterus) sternbergi has been recorded in South Korea and some were described by foreign entomologist without comparative examination. In addition, most of them were not reviewed since the original description. Therefore, based on this study, all subspecies of this group in South Korea were revised taxonomically, and a new subspecific key was provided. As a result, 8 subspecies of Eucarabus (Parhomopterus) sternbergi were confirmed in South Korea and their new synonyms are as follows: Eucarabus (Parhomopterus) sternbergi sternbergi (Roeschke, 1898) = E. (P.) s. gimhwa (Rapuzzi, 2015); E. (P.) s. honamensis (Kwon et Lee, 1984) = E. (P.) s. jindoensis (Rapuzzi, 2015) = E. (P.) s. goheungicus (Rapuzzi, 2015); E. (P.) s. schnelli (Lassalle, 1999) = E. (P.) s. deogyusan (Rapuzzi, 2015).