• 한국결정학회지
• /
• 제7권2호
• /
• pp.133-146
• /
• 1996

전기 도금법으로 제조한 백금흑의 형상과 적외선 흡수특성을 XRD, SEM, IR 분광기를 사용하여 조사하였다. 금(Au)이 입혀진 알루미나 유리기판 위에 pH 1.0∼1.5에서 1∼5분동안 백금층을 입혔는데, 염화백금과 아세트산 납으로 제조한 용액을 전해액으로 사용하였다. 전류밀도가 20∼50 mA/㎠일 때 백금흑은 수지상으로 성장하여 "나무"와 같은 형태를 보였다. 백금흑의 면적밀도가 1.3mg/㎠ 이상일 때 10μm의 적외선에서 측정한 수광효율은 90% 이상이었다.

• The Korean Journal of Ecology
• /
• 제24권4호
• /
• pp.205-211
• /
• 2001

The floristic composition and structure of the Oriental Arbor-viate forest, natural monument no. 1, were investigated in the Daegu city, southeastern Korea. Vegetation stratification have four layers including tree (＞5m), subtree (2m-5m), shrub (1m-2m) and herbs (＜1m), which occupied 63.8%, 10.7%, 12.1% and 49.4%, respectively. The vegetation of the study area were divided into Artemisia keiskeana - Quercus variabilis and Pyrrosia linearifolia-Thuja orientalis (OAV) communities. Frequency distribution for diameter classes of the Oriental Arbor-vitae population showed a reverse-J shape. The result suggests that the OAV forest of this site might maintains continuously the present state. The annual radial growth of OAV, Pinus densiflora and Quercus variabilis, the dominant species of the present site showed 0.29, 1.01 and 1.28 mm/year, respectively. Competition of OAV with theh other species including P. densiflora and Q. variabilis could influence negatively on the growthand survival of OAV forest in this site.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 1997년도 추계학술대회 논문집
• /
• pp.313-316
• /
• 1997

The effects of aromatic curing agent of MDA contents and post curing conditions on dielectric deterioration characteristics of DGEBA/MDA/SN system were investigated. The dielectric properties were measured by using needle-plane electrode geometry under the commercial AC high electric field application. As the curing agent content increased, the dielectric breakdown strength increased and then decreased slightly. All the trees initiated from the tip of needle electrode and the shape of the tree in this system was a dendrite type.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 1997년도 추계학술대회 논문집
• /
• pp.381-384
• /
• 1997

This paper describes the method of diagnosing the degradation by void defects of insulator inside in operation. Needle-shape void specimens, made from LDPE, were used to generate an electrical tree under ac voltage. The method uses a neural network system with input signal of AE patterns. AE pattern consists of the pulse count and average amplitude according to the phase angle. After the learning process was over, unknown emission patterns were put into the network. It was shown that the network discriminates the void deflects well. The effectiveness of the neural network system for partial discharge recognition was shown.

• Journal of Biosystems Engineering
• /
• 제25권5호
• /
• pp.399-408
• /
• 2000

This study is final focused on developing fruit harvesting robot can distinguish fruit type and status accurately. Multi-joint robot is able to discriminate tree shape and select mature fruit by image processing. The multi-joint robot consists of (a) rotating base, (b)turning first joint-arm, (c)rotating and turning second joint-arm, (d)rotating and turning third joint-arm, (e)rotating and turning last joint and (f)picker hand. The operational ranges of the robot are: horizontal 860~2,220mm, vertical 1,440~2,260mm, 270 degrees’rotation angle, 90 or 270 degrees’turning angle. The robot weighs 330kg. The multi-joint robot was designed in high accuracy and efficiency by getting as close as the movements of human arms and waist.

• 한국조경학회지
• /
• 제21권2호
• /
• pp.8-16
• /
• 1993

The purpose of this paper is to analyze the linguistic origin of the species manes of landscape plants in order to help students understand the physical characteristics of the plants through the botanical names. This study includes the plants that are possible to use as landscape material as well as both the native and foreign plants that are already used. Name of Species of Scientific name in Landscape plant be derived from region or nations of habitat, botanist, plant explors, and their sponser, and plant form and number of leaves or flowers, character or ingredient of plants and shape of stem, tree crown form. In this paper, about 300 species(contains varieties, formas) are interpreted into etymological meanings.

• 방사선산업학회지
• /
• 제4권3호
• /
• pp.215-219
• /
• 2010

We have subjected to gamma-irradiation to citrus buds and then grafted onto mature citrus tree. Mutant citrus branch lines have been induced. As a result of first selection, we found the several mutant lines showing interesting phenotypes such as higher sugar content. We have selected several branches showing good qualities such as higher sweetness and/or lower acidity. Some branch lines showed over $13^{\circ}Brix$ sugar content and below 0.9% acidity. Other mutant branch lines showed the changes of shape, size, peel thickness, and fiber contents or distribution of fruits. The results suggest that gamma-irradiation is an effective tool for induction of citrus mutant lines.

• Journal of Species Research
• /
• 제11권3호
• /
• pp.162-168
• /
• 2022

Compared to marine dinoflagellates, freshwater species are rarely recorded in Korea. In the present study, we isolated a freshwater dinoflagellate, Palatinus, from the Paldang Reservoir, Korea, in December 2021. The overall cell shape was ovoid, and the cell size was 34.3 ㎛ in length (25.8-39.5 ㎛) and 28.4 ㎛ in width (21.5-34 ㎛). An eyespot was usually observed near the sulcal region. The Kofoidian plate formula of the species was determined to be 4', 2a, 7", 6c, 5s, 5''', and 2''''. Apical pore complex was not observed. However, variations in the cingular plate caused by the fusion of 3C and 4C were observed. Analyses of 28S rDNA sequences revealed that the unidentified species is 100% similar to Palatinus apiculatus, and clustered together in the same lineage in the phylogenetic tree (100% bootstrap value). Our findings confirmed that the isolated dinoflagellate is Palatinus apiculatus, which was discovered for the first time in Korean freshwaters.

• Fisheries and Aquatic Sciences
• /
• 제27권7호
• /
• pp.411-420
• /
• 2024

The objective of this research was to identify the morphology and molecular profile of crab caught from the coast of Tambala Village, Tombariri District, Minahasa Regency, North Sulawesi. Crabs were collected from the intertidal zone at night during the lowest tide. Crabs were morphological identified by description of shape, color and size of the carapace. Molecular identification was done through DNA barcoding including DNA extraction, amplification of the cytochrome c oxidase subunit I (COI) gene and electrophoresis. Morphological and genetic analysis identified the crab species as Metopograpsus oceanicus.

• 한국산림과학회지
• /
• 제43권1호
• /
• pp.1-5
• /
• 1979

Poulusp alba P. glandulosa와 그의 양친종(兩親種)에 대(對)하여 엽병(葉柄)의 중간부위(中間部位)의 유관속(維管束)의 수(數)와 배열상태(配列狀態)를 조사하여 다음과 같은 결과(結果)를 얻었다. 1) 유관속(維管束)의 수(數)와 배열상태(配列狀態)의 변이(變異)는 엽병(葉炳)의 중간부위(中間部位)가 엽신측부위(葉身側部位)보다 변화(變化)가 적었다. 2) 유관속(維管束)의 배열(配列)과 수(數)의 변이(變異)는 한 개체(個體)에서, 또는 동일(同一) clone의 개체(個體)에 따라서, 그리고 동일(同一) 수종(樹種)의 개체(個體)에 따라서 다소(多少)의 변이(變異)가 있다. 3) P. alba${\times}$P. glandulosa의 $F_1$의 유관속형(維管束型)은 5 type이 있다. 그중(中) 26.7%는 P. alba와과 동일형(同一型)이고, 13.3%는 P. glandulosa와 동일형(同一型)이고, 그리고 53.3%은 유전(遺傳)에 의(依)하여 연유(緣由)된 $F_1$형(型)이다. 4) P. alba형(型)을 가진 clone number는 66-20-1, 66-6-8, 65-22-11, 64-6-44, P.이고, 그 중(中)에는 P. tomentiglandulosa와 유사(類似)한 clone도 있었다. P. glandulosa형(型)의 clone number는 65-95, 66-14-93,이다. $F_1$형(型)의 clone은 66-15-3, 67-6-3, 65-22-4, 66-26-55, 68-1-54, 66-14-99, 65-29-19, 66-25-5이다.