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손동수,김진태,이상훈,한세현,김종철,선예경 大韓小兒齒科學會 1993 大韓小兒齒科學會誌 Vol.20 No.2
The purpose of this study was to obtain roentgenocephalmetric norms of the Korean mixed dentition children which are used in the occlusal guidance treatment. The 121 subjects(57 males and 64 females) were consisted of mixed dentition children who showed up in Department of Pediatric Dentistry Seoul National University Hospital from June 1990 till February 1993 and contestants of the Heathy Dentition Contest in 1992 and 1993. The subjects had normal profiles and occlusions without severe carious lesions or missing teeth. Following results were obtained from Sassouni, Ricketts and McNamara analysis; 1. Norms and standard deviations of the children were obtained. 2. ANS, upper incisor, pogonion, upper 1st molar and gonion were located posterior to their reference arcs and B was located anterior to its reference arc. 3. Lower anterior facial height was longer than upper anterior facial height and upper posterior facial height was longer than lower posterior facial height. Mandibular corpus length was longer than anterior cranial base length. 4. Anterior cranial length was longer in male(p<0.05) and mandibular corpus length was longer in male than in those of female(p<0.01). Porion was located more posterior in male than in those of female(p<0.05) 5. Effective mandibular length and lower anterior facial height were longer in male than in those of female(p<0.005). Effective midfacial length was longer in male than in those of female(p<0.05).
원예연,장준섭,정인혁,한대용,한창동,서진석 아주대학교 의과학연구소 1999 아주의학 Vol.4 No.1
With 77 hip joints of Korean adults available, anatomical study was carried out to clarify morphological variations of the acetabular labrum, the acetabular articular cartilage, the penetrating sites, the purchasing lengths of transacetabular screws including dangerous neurovascular structures, and the theoretical safe space of the acetabular fossa. The results were as follows; 1. The posterior superior region of the acetabulum through which the screw could be inserted more than 50 ㎜ in length was the safest region. However, depending on the insertion angle, the screw could penetrate the psoas muscle with an average 30 ㎜ of intervening space. 2. The average purchasing length of the screws penetrating the mid point (B) of the articular surface which was located on the inferior portion of the line (AB) connecting the anterior superior iliac spine and the center of the acetabulum: the mid points (C and D) of the articular surface which was located on the anterior and posterior portion of the line (CD) perpendicular to the line AB; and the mid point (G) of the articular surface which was located on the posterior inferior portion of the acetabular articular surface, was more than 20 ㎜. The screws penetrating the point "C" had a risk to damage the bladder and the screws penetrating the points "D" and "G" had a risk to endanger gluteal neurovascular bundles. 3. The screw placed in the anterior superior region of the acetabulum could be directed toward the external iliac vessels. The perpendicular bony thickness of this region averaged 13 ㎜. The topographical relationship of the external iliac artery and vein was variable and classified into 6 types. 4. At the center of the acetabulum, the most vulnerable structure was the obturator neurovascular bundle and the average thickness of bone at this point was measured as 6.5 ㎜. 5. The thickness of the compact bone became wider from the inner side to the outer side of the lunate surface. 6. The posterior inferior portion of the acetabular fossa would be a danger area when we used the screws for infernal fixation of the acetabular fracture through the acetabular fossa. 7. The morphological variations of the acetabular labrum which were measured differently at different locations should be considered during reading magnetic resonance images. 8. The anterior, anterosuperior and posterosuperior portion of the acetabular labrum might be easily torn because the labrum was attached to the bone-like "seating on a flat bony surface." 9. The shape of the articular cartilage was classified into 5 types according to the position of both ends. The above data in this study revealed new findings which should be considered at the times of diagnosis and operation of the hip joint together with morphological characteristics of Korean adult hips.
김동일,김예현,장호경 嶺南大學校 環境問題硏究所 1995 環境硏究 Vol.14 No.2
실외에서 실험으로 지면의 음향임피던스에 의한 방음벽의 소음감쇠 특성을 고찰하였다. 측정은 방음벽이 없을 때, 연속 및 불연속 음향임피던스를 가지는 지면에 대하여 315Hz ~ 3150Hz 사이의 1/3 옥타브밴드 주파수대역으로 실시하였다. 사용한 재료의 음향임피던스는 초지, 아스팔트 순으로 커지며 이는 다공성과 반비례 한다. 지면의 조건에 따라 각각 판형 방음벽을 설치하여 삽입손실을 조사하였다. 초과감쇠의 최소치를 나타내는 주파수 영역은 음향임피던스와 경로차에 의존하였다. 그리고 방음벽에 의한 삽입손실은 방음벽에 의한 회절과 지면의 음향임피던스에 의존하였다. The experiments on the noise reduction which is caused by barrier considering various ground impedance, have been made. Measurements were made in 1/3 octave band over the frequency range 315Hz~3150Hz above ground with continuous and discontinuous impedance without barriers. The ground impedances for grass and asphalt was increased, respectively. And, the ground impedance is inverse proportional to porosity. The barrier insertion loss was investigated on the various ground impedance with thin and perfectly reflecting barrier. The frequency ranges of minumum excess attenuation are strongly dependent on the ground impedance and the path-difference. The barriers insertion loss are found to be explicitly dependent on the ground impedance and the diffraction by barrier.
김동일,장호경,이준하,김예현 嶺南大學校 基礎科學硏究所 1993 基礎科學硏究 Vol.13 No.-
This study has been focused on the excess attenuation measured for acoustic interference of path length differences and ground effect. Results are obtained in the frequency range between 300Hz and 10000Hz. As the ground admittance and source height increase, the minimum of the excess attenuation curve shifts to lower frequencies. On the other hand, horizontal range increase the minimum of the excess attenuation curve shifts to higher frequencies. The theoretical results of excess attenuation have been compared to experimentally measured attenuations by interference and well in agreed with both horizontal ranges and source heights.
이준하,김동일,김예현,장호경 嶺南大學校 基礎科學硏究所 1992 基礎科學硏究 Vol.12 No.-
A single beam photoacoustic spectrum analysis of the light absorption and radiationless processes from powdered solid samples is described. When the chopped light impinges on some condenced matters such as CuSO₄and ZnO, in a closed cell, the acoustic signals are prodeced within the cell. In order to investigate the physical properties of powdered solids, the acoustic signals were detected using a gas-microphone. The photoacoustic spectrum analysis of the various samples was carried out to obtain the intensity of the P.A. signal in terms of light wavelength. The light absorption spectrum of powdered CuSO₄obtained by using P.A. spetroscopy was similar to those obtained by using of optical spectrometry. the energy bandgap according to energy transitions of ZnO was 3.4 eV.
Control effect of anion on Tetranychus urticae and Aphis gossypii
Dong-Hyun Kang,Gyeong Yeop Lim,Seung Geun Ye,Tae Woong Lee,Hyun-Na Koo,Gil-Hah Kim 한국응용곤충학회 2024 한국응용곤충학회 학술대회논문집 Vol.2024 No.04
식물에 전기장을 처리하면 식물의 생장속도가 빨라지거나 영양학적으로 긍정적인 변화가 생긴다고 알려져 있다. 최근 음이온 처리 시 식물에 전기장을 처리한 것과 유사한 효과가 나타난다고 보고되었고 본 연구에서는 이러한 음이온을 온실해충인 점박이응애와 목화진딧물에 처리하여 방제효과 여부를 확인하였다. 그 결과 음이 온 처리 시 점박이응애와 목화진딧물에서 살충효과와 기피효과가 나타났다. 또한, 점박이응애 알에서도 음이온 처리가 부화율에 영향을 주는 것을 확인할 수 있었다. 이러한 시험 결과를 바탕으로 온실에서 밀도실험 결과, 700,000 ion/cm3 농도에서 무처리구에 비해 밀도가 감소함을 확인할 수 있었다. 따라서, 본 연구는 음이온 처리 시, 부가적인 효과로 온실해충(점박이응애, 목화진딧물)에 대해 친환경적 방제 가능성을 보여준다.