뒷날개흰밤나방(Aedia leucomelas)의 형태적 특징, 온도별 발육기간, 발생소장 및 고구마 섭식량

이건휘,백채운,김두호,최만영,나승용,김상수 한국응용곤충학회 2003 한국응용곤충학회지 Vol.42 No.1

고구마를 가해하는 됫날개흰밤나방(Aedia leucomelas)의 형태적 특징과 온도에 따른 발육특성 그리고 발생소장 및 고구마 가해양상을 1999부터 2000년까지 실내와 고구마포장에서 조사하였다. 성충은 흑갈색으로 체장은 암컷이 20.2mm,수컷이 18.9mm이었고, 날개 편 길이는 각각 33.7mm, 29.4mm이었다. 난은 납작한 원형이며, 유충은 엷은 황녹색-짙은 회색으로 체장은 3.3-53.5 mm이고, 번데기는 진한 갈색으로 체장은 15.1 mm이었다. 난부터 우화까지의 평균발육기 간은 15, 20, 25, 3$0^{\circ}C$ (60$\pm$5% RH, 16L : 8D)에서 각각 108.5, 70:7, 40.2, 29.1일로 온도가 증가할수록 발육기간이 짧아졌다. 각 태별 발육영점온도와 유효적산온도는 난은 10.7$^{\circ}$C와 67.5일도, 유충은 11.0$^{\circ}$C와 275.1일도, 번데기는 9.3$^{\circ}$C와 244.6일도 이었다. 암컷의 수명은 위 조사온도에서 각각 14.6, 12.8, 11.1, 10.3일이었고, 산란수는 각각 43, 189,244,265개로 성충수명은 고온일수록 짧아졌지만 산란수는 증가하였다. 됫날개흰밤나방 유충은 고구마 포장에서 6월 중순부터 10월까지 발생되었는데 9월 상-중순에 발생량이 가장 많았다. 유충의 섭식량은 20-$25^{\circ}C$에서 가장 많았고, 25$^{\circ}$C에서 1령, 2령, 3령, 4령, 5령 유충의 1일 섭식량은 각각 0.4, 3.6, 19.6, 40.7, 78.9$\textrm{cm}^2$ 였다. Morphological characteristics, developmental period, and seasonal occurrence of Adeia leucomelas (L.) were investigated from 1999 to 2000. In addition, consumption of sweetpotato as food was also examined. Adults of A. leucomelas were dark-brown and body lengths of females and males were 20.2 mm and 18.9 mm, respectively, Wing expanse of female and male was 33.7 mm and 29.4mm, respectively. Egg was flat round-shape. Larva was light yellow-green to dark-brown with 3.3-53.5 mm. Pupa was deep-brown and 15.1 mm in length. Developmental periods of A. leucomelas from egg to adult emergence at different temperatures of 15, 20, 25, and 30$^{\circ}$C were 108.5, 70.7, 40.2, and 29.1 days, respectively, Developmental threshold (DT) and effective accumulative temperatures were estimated as 10.7$^{\circ}$C and 67.5 DD in egg stage, 11.0$^{\circ}$C and 275.1 DD in larval stage and 9.3$^{\circ}$C and 244.6 DD in pupal stage, respectively. The longevity of adult female was shortened with increment of temperature, whereas the total numbers of eggs laid by a female were increased. The larvae of A.leucomelas occurred from mid-June to early October, and population reached its peak during early to mid-September in Jeonbuk province. Food consumption of A. leucomelas was highest at 20-25$^{\circ}$C. Food consumption of 1 st, 2nd, 3rd, 4th, and 5th larvae of A. leucomelas per day at 25$^{\circ}$C was 0.4, 3.6, 19.6, 40.7, and 78.9 $\textrm{cm}^2$, respectively.

단측 문합관에 대한 박동류의 3 차원 유동해석

이건휘,이봉구,김종희 원광대학교 공업기술개발연구소 2000 工業技術開發硏究誌 Vol.20 No.-

When there were damages caused by blood vessel occlusion or external factor in artery blood vessel, the part was cut off. To examine the effects on blood vessels in case of an end-to-side anastomoses with PTFE synthetic artery, each diameter ratio of artery blood vessel and synthetic artery was set to 2:1 and entrance range of the synthetic artery was set to 50 times of the diameter so that it could be a fully developed velocity profile and we put pulsatile flow to examine effects on blood vessel center line velocity profile, separation point and wall shear stress. The periodic of pulsatile flow that we tested was 1 second. we examined wall shear stresses and separation points depended on the obtained data at intervals of 0.02 second. The highest value of wall shear stress was appear when the inlet velocity was maximum or minimum. And separation was occurred in those points. The highest value in the wall shear stress was occur in the vicinity of the anastomoses when the blood flowed back word that is, the minimum velocity.

가솔린 엔진의 실린더 블럭 내벽면의 온도분포에 관한 비정상 열전달 해석

이건휘,홍진관,최영돈 대한기계학회 1989 대한기계학회 춘추학술대회 Vol.- No.-

직사각형 휜이 부착된 실린더 블럭의 정상 및 비정상 열전도 해석

이건휘,최영돈 대한기계학회 1990 대한기계학회논문집 Vol.14 No.5

본 연구에서는 기관 실린더 사이의 거리와 기관 블럭의 외벽에 부착된 윈이 실린더내벽면 온도분포에 미치는 영향을 알아보기 위하여 2차원 정상.비정상 열전도 해석을 하였다. 물론 2차원 열전도 해석 결과는 전 실린더 블럭에 적용할 수 있는 것은 아니며 블럭의 상단과 하단 부근에서는 적용시키기 어렵고 중간 부근에서만 적용 할수 있는 것이지만, 2차원 해석을 통해서 격자의 수를 대단히 많이 늘일 수 있어서 그해의 정확도를 높힐 수 있기 때문에 실린더 사이의 간격과 휜의 크기 등이 실린더 내벽면 온도에 미치는 영향, 정상.비정상 해석의 차이점 등을 명확히 규명할 수 있는 잇점이 있어서 본 연구에서 채택하였다.따라서 본 해석 결과는 전 실린더에 대해서 국부적으로 적용될 수 있는 것이 아니라 전 실린더에서의 값에 대한 평균 값으로 이해 되어야 할 것이다. The temperature distribution and heat flux of the inner cylinder wall of a 4-cycle turbocharged gasoline engine were calculated by a 2-dimensional coordinate transformation. Boundary conditions of the inner wall of the cylinder were taken from the results of diagnostic engine simulations. Results show that the ununiformity of inner wall temperature of the cylinder black can be reduced by a proper choice of the thickness of fin and the distance between two cylinder blocks.

벼멸구와 흰등멸구의 단독 및 복합발생에 따른 벼생육시기별 서식처 선호성에 관한 연구

이건휘,이승찬 한국응용곤충학회 1988 한국응용곤충학회지 Vol.27 No.2

벼멸구와 흰등멸구의 단독 및 복합접종시의 개체군밀도변동과 기주식물의 생육시기에 따른 Experiments were conducted to investigate the locational and ovipositional preferences of the single and mixed populations of the brown planthopper(BPH), Nilaparvata lugens (Stal), and the whitebacked planthopper(WBPH),Sogatella furcifera (Hovath), with the different popula-tion densities at seeding, max-tillering, booting and heading stages of rice variety seonam by대. The WBPH showed a locational preference for the upper portion while the BPH was observed to stay generally on the lower portion regardless of rice growth stages, population density-levels and the single or the mixed populations of two species. At seeding, max-tillerinf, boo-tring and heading stage, the preference for the lower portion of the rice plants was found to be slighty reduced with the lapse of time, respectively, from the single or the mixed popula-tions of both the species. Ovipositional lication of both the species was found not to be affected by the different population densities at rice growth stage. Although the BPH prefered a ovi-positional location for the lower portion at seeding, booting and heading stages, its preference-was somewhat reduced with the developmental stages of rice plants, whereas the WBPH showed a ovipositional preference for lower portion at seeding stages, but prefered the same tendency of ovipositional preference for the upper and the lower portion, The location and ovipositional preferences were likely to be affected by the competition between species with the mixed populations rather than single.

수질관리 지원을 위한 GIS기반의 EFDC 모델 후처리 시스템 개발 연구

이건휘,김계현,박용길,이성주 대한공간정보학회 2014 Spatial Information Research Vol.22 No.4

The Yeongsan river estuary has a serious water quality problem due to the water stagnation and it is imperative to predict the changes of water quality for mitigating water pollution. EFDC(Environmental Fluid Dynamics Code) model was mainly utilized to predict the changes of water quality for the estuary. The EFDC modeling normally accompanies the large volume of modeling output. For checking the spatial distribution of the modeling results, post-processing for converting of the output is prerequisite and mainly post-processing program is EFDC_Explorer. However, EFDC_Explorer only shows the spatial distribution of the time series and this doesn't support overlay function with other thematic maps. This means the impossible to the connection analysis with a various GIS data and high dimensional analysis. Therefore, this study aims to develop a post-processing system of a EFDC output to use them as GIS layers. For achieving this purpose, a editing module for main input files, and a module for converting binary format into an ASCII format, and a module for converting it into a layer format to use in a GIS based environment, and a module for visualizing the reconfigured model result efficiently were developed. Using the developed system, result file is possible to automatically convert the GIS based layer and it is possible to utilize for water quality management.

원형단면의 곡관에서의 난류유동 측정

이건휘,Lee, Geon-Hwi 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.7

Hot-wire measurement of the longitudinal and radial velocity components and Reynolds stresses are reported for developing turbulent flow in a strongly curved 180 deg. pipe and its tangents. Slanted wire is rotated to 6 directions and the voltage outputs of them are combined to obtain the mean velocities and Reynolds stresses. Significant double maxima in the longitudinal velocity component appear in the bend. V-profiles reveal the development of a strong secondary flow. This secondary flow is induced by the transverse pressure gradient set up between the outer(r$\sub$o/) and inner(r$\sub$i/) wall region of the bend. Another second cross-stream flow develops after .theta.=135 deg. and its direction is opposed to that of main second flow.

회전하는 정사각단면 $90^{\circ}$곡관내 난류유동에 관한 수치해석적 연구

이건휘,최영돈 대한기계학회 1995 대한기계학회논문집 Vol.19 No.9

In this study, the characteristics of the three-dimensional turbulence flow in a rotating square sectioned 90.deg. bend were investigated by numerical simulation. And a dimensionless number, Coriolis force ratio, primarily subjected to the feature of the flow in the rotating 90.deg. bend was obtained as a result of one-dimensional theory. In the simulation study, low Reynolds number ASM developed by Kim(1991) in the square sectioned 180.deg. bend flow was modified in order to consider the rotational effects in the testing flows. In the near wall region of low Reynolds number, four turbulence models were employed and compared in order to find the most appropriate model for the analysis of the rotating 90.deg. bend flow. By comparison of the results with the experimental data, it is shown that low Reynolds number Algebraic Stress Model with rotating terms reflects most correctly the rotational effects. As the results of this study, centrifugal forces associated with the curvature of the bend and Coriolis forces and centripetal forces associated with the rotation affect directly both the mean motion and the turbulent fluctuations. Their actions on the mean flow are to induce a secondary motion while their effects on turbulence are to modify the pressure strain.

수질관리 지원을 위한 GIS기반의 EFDC 모델 후처리 시스템 개발 연구

이건휘,김계현,박용길,이성주,Lee, Geon Hwi,Kim, Kye Hyun,Park, Yong Gil,Lee, Sung Joo 대한공간정보학회 2014 한국공간정보학회지 Vol.22 No.4

The Yeongsan river estuary has a serious water quality problem due to the water stagnation and it is imperative to predict the changes of water quality for mitigating water pollution. EFDC(Environmental Fluid Dynamics Code) model was mainly utilized to predict the changes of water quality for the estuary. The EFDC modeling normally accompanies the large volume of modeling output. For checking the spatial distribution of the modeling results, post-processing for converting of the output is prerequisite and mainly post-processing program is EFDC_Explorer. However, EFDC_Explorer only shows the spatial distribution of the time series and this doesn't support overlay function with other thematic maps. This means the impossible to the connection analysis with a various GIS data and high dimensional analysis. Therefore, this study aims to develop a post-processing system of a EFDC output to use them as GIS layers. For achieving this purpose, a editing module for main input files, and a module for converting binary format into an ASCII format, and a module for converting it into a layer format to use in a GIS based environment, and a module for visualizing the reconfigured model result efficiently were developed. Using the developed system, result file is possible to automatically convert the GIS based layer and it is possible to utilize for water quality management.

회전하는 정사각단면의 $90^{\circ}$곡관내 난류유동에 관한 실험적 연구

이건휘,최영돈 대한기계학회 1995 대한기계학회논문집 Vol.19 No.9

0The fields of turbomachinery and electrical generators provide many examples of flow through rotating internal passages. At the practicing Reynolds number, most of the flow motion is three dimensional and highly turbulent. The proper understanding for the characteristics of these turbulent flow is necessary for the design of thermo-fluid machinery of a good efficiency. The flow characteristics in the rotating duct with curvature are very complex in practice due to the curvature and rotational effect of the duct. The understanding of the effect of the curvature on the structure and rotational effect of the duct. The understanding of the effect of the curvature on the structure of turbulence in the curved passage and the characteristics of the flow in a rotating radial straight channel have been well studied separately by many workers. But the combined effects of curvature and rotation on the flow have not been well understood inspite of the importance of the phenomena in the practical design process. In this study, the characteristics of a developing turbulent flow in a square sectioned 90.deg. bend rotating at a constant angular velocity are measured by using hot-wire anemometer to seize the rotational effects on the flow characteristics. As the results of this study, centrifugal forces associated with the curvature of the bend and Coriolis forces and centripetal forces associated with the rotational affect directly both the mean motion and the turbulent fluctuations.