Integrability of an almost complex structure on $S^4\times_f V^2$

조종택,전선향,어윤희 대한수학회 2022 대한수학회보 Vol.59 No.4

In this paper, we prove that any orthogonal almost complex structure on a warped product manifold of any oriented closed surface and a round 4-sphere for a concircular warping function on the sphere is never integrable. This gives a partial answer to Calabi's problem.

우리나라 시설원예의 병해 현황과 그 방제대책 및 문제점

조종택 한국응용곤충학회 1976 한국응용곤충학회지 Vol.15 No.4

우리나라의 딸기 신병해 겹무늬병 (Dondrophoma obscurans)에 관한 연구

조종택,문병주 한국응용곤충학회 1979 한국응용곤충학회지 Vol.18 No.4

1. 1977년 경남 김해에서 처음 발견되어 현재 딸기 잎의 반점성병해로서 최우점종으로 나타났으며 그 피해 막심하였다. 그 병징은 논문이 뚜렷한 대형의 갈색반점 또는 V자형의 갈반을 형성하였으au 병반이오래되면 중앙 고사부의 표리양면에 흑색의 병자각이 다수형성되었다. 본병원균을 분리한 결과우리나라에서는 미기록 병해인 Dendrophoma obscurans로 동정되었으며 본병을 겹무늬 병이라 명명하였다. 2. 본균의 병자각형성에는 광선이 필수조건이었으며 PDA배지상에서 병자각의 형성이 많았다. 3. 딸기 48품종에 대하여 품종간 발병의 차이를 조사한 결과 Red gauntlet, Senga Sengana, Torrey, Horida's wonder, Hokowase, Kogyoku, Dehak I등이 발병율이 높았으며 또 어린엽보다는 노엽에서 발병이 심하였다. The study has been carried to describe a new disease of strawberry in Korea, which was found in 1977 at Kimhae. Symptom of the disease occurred mainly on leaves as showing large annular brown spots or 'V' shaped brown lesions. Many of dark pycnidia were observed from the both side of old lesions. The pathogen was identified as Dendrophoma obscurans (Ell. & Ev) Anderson which has not been described in Korea as a pathogen of strawberry disease. The common name of the disease was given, temporaly, as Annular leaf blight of strawberry. In the laboratory study, light was necessary for the production of pycnidia and potato dextrose agar was the best media for tile pycnidia formation. There were some difference on resistance to the disease among 48 tested strawberry varieties though none of them shelved highly resistant reaction, and the older leaves showed more susceptible reaction than younger ones.

NOTES ON ALMOST KENMOTSU THREE-MANIFOLDS

조종택 호남수학회 2014 호남수학학술지 Vol.36 No.3

We study 3-dimensional non-unimodular Lie groups with a left-invariant almost Kenmotsu structure.

우리나라의 딸기 신병해(新病害) 겹무늬병 (Dondrophoma obscurans)에 관(關)한 연구

조종택,문병주 한국식물병리학회 1979 한국식물보호학회지 Vol.18 No.4

딸기의 花芽分化와 그 發育에 關한 硏究 [第一報]

曺鍾澤 東亞大學校 1971 東亞論叢 Vol.8 No.3

1. 高冷地 育苗에 의한 딸기의 促成 栽培 方法은 勞力, 經費가 많이 들고 株冷藏에 의한 抑制栽培方法은 苗의 쇠약으로 活着率이 나쁘기 때문에 短期間에 花芽分化를 일으킬 수 있는 人工低溫處理 方法과 分化後의 花芽發育促進과 體眠打破를 위하여 生長調整劑의 處理에 關한 試驗을 하였다. 2. 供試 品種은 Danner, Hong-hak, Early dawn, Red grow, ??玉을 使用하였다. 3. 人工低溫處理는 8月 31日~9月 9日까지 10日間, 9℃~14℃로 處理하였고, 處理中 1日間 8時間의 電照를 하였다. 4. 花芽 發育 促進을 위하여 Gibberellin 10ppm을 2回 산포하였다. 5. 花芽 分化 狀況은 紅鶴과 Early dawn이 80%, Red grow가 40%, Danner와 幸玉은 20%였다. 6. 年末 年始에 딸기를 收穫할 수 있는 開花 限界期인 11月 20日까지에 開花한 成績은 株當紅鶴이 11.3個, Early dawn이 10.3, Red grow 6.3, 幸玉 2.4, Danner 1.6個였으나 Gibberellin을 處理한 區에 있어서는 紅鶴이 16.4, Early dawn이 13.4, Red grow 9.9로 그 效果가 좋았다. 7. 果實의 收量은 2月 10日 現在까지에 紅鶴이 株當 10.5個, Early dawn이 9.7, Danner가 9.3個 收穫 되었으나 Gibberellin을 處理한 區에서는 紅鶴이 15.0, Early dawn이 13.1, Danner가 11.4, Red grow가 10.8個로 收穫되었다. 8. 이 試驗 結果로 미루어 보아 딸기의 促成栽培는 人工低溫과 Gibberellin을 處理를 兼하여 實施하는 것이 가장 效果的이고 實用的이라고 생각한다. 1. It was observed that the way of forcing Strawberries by raising seedlings on cold high land wanted much labour and high cost, and its effect depended largely upon the weather conditions. We therefore tried to harvest strawberries during December and January by shorting the period of flower bud differentiation and its development conducted both artificial low temperature treatment and Gibberellin treatment. 2. Varieties observed were Danner, Hong-hak, Hang-ok, Early dawn, Red grow. 3. Low temperature treatment was conducted for 10 days from August 31th to September 9th. Strawberry seedlings which were closely planted in a low temperature box were lighted with 20 Watt fluorescent lamp from 30cm away for 8 hours a day. 4. The results for flower bud differentiation were observed that Hong-hak and Early dawn were 80% differentiation, Red grow 40%, Danner and Hang-ok 20%. 5. On November 20th, the finial period when we could harvest strawberries at the Christmas and New year season, Hong-hak bloomed 11.3 flowers per a plant, Early dawn 10.3, Red grow 6.3, Hang-ok 2.4, Danner 1.6, But at the Gibberellin treatment plot, Hong-hak bloomed 16.4 flowers a plant, Early dawn 13.4, Red grow 9.9. 6. Up to the 10th February, total yields of strawberries were 10.5 berries for Hong-hak per a plant, 9.7 for Early dawn, 9.3 for Danner 7.5 for Red glow and 3.5 for Hang-ok. But at the Gibberellin treatment plot, 15.0 berries for Hong-hak, 13.1 for Early dawn 11.4, for Danner, 10.8 for Red grow.

딸기 검은무늬병(Alternaria alternata (Fr.) Keissler)의 발생에 관하여

조종택,문병주 한국응용곤충학회 1980 한국응용곤충학회지 Vol.19 No.4

1979년 7월 경남 김해에서 딸기 성강 16호의 잎에 흑갈색 내지 암갈색 병반을 형성하는 병해를 발견, 그 병원균을 분리 검토한 결과 우리나라에서는 미기록병해인 Alternaria alternate (Fr.) Keissler로 동정되었으며 본병을 검은무늬병이라 명명하였다. 본균의 분생포자의 형태는 배지간에 차가 심하였으며 C.M.A.에서 평균 , beak의 길이는 으로서 자연감염된 딸기잎상에서 형성된 것 보다 짧았다. 딸기 49품종에 접종한 결과 성강 16호와 Robinson이 고도감수성이였으며 Catskill, Cyclone, Northwest, Merton princes, Juspa, 및 대학 1호 등의 품종에도 발병을 볼 수 있었으나 31 품종은 전연 발병되지 않았다. 10종(14품종)에 접종한 결과 해바라기, 겹해바라기, 및 멕시코 해바라기에만 심하게 발병되었다. A new disease of strawberry caused by Alternaria was found in Gim Hae, Gyougnam province, in July 1979. The symptoms of the disease occurred mainly on leaves as showing dark brown spots with circular to irregular, in diameter. The pathogen was identified as Alternaria alternate (Fr.) Keissler which has not been described in Korea as a pathogen of strawberry disease. The common name of the disease was given as Gum un mum byung of strawberry. The conidia shape and size of this fungus varied considerably with culture media. The measurements of conidia and beak on corn meal agar were , respectively, which were shorter than those on strawberry leaf lesions in the field. Among 49 strawberry varieties tested, Morioca 16 and Robinson were highly susceptible to the disease by artificial inoculation and Catskill, Cyclone, Northwest, Merton princess, Juspa and Daehak I were moderately susceptible whereas 31 varieties were resistant. This fungus could also infect the leaf of Common garden sunflower, Double sunflower and Mexican sunflower among the 14 plants species tested

$\eta$-parallel H-contact 3-manifolds

조종택 대한수학회 2018 대한수학회보 Vol.55 No.4

In this paper, we give a local and global classification of 3-dimensional H-contact manifolds whose Ricci tensor is $\eta$-parallel.

Gliocladium virens와 Trichoderma harzianum에 의한 오이 덩굴쪼김병의 생물적방제(生物的防除)

조종택,문병주,하상영 한국식물병리학회 1989 Plant Pathology Journal Vol.5 No.3

Geometry of contact strongly pseudo-convex CR-manifolds

조종택 대한수학회 2006 대한수학회지 Vol.43 No.5

As a natural generalization of a Sasakian space form, wedefine a contact strongly pseudo-convex CR-space form (of constantpseudo-holomorphic sectional curvature) by using theTana-ka-Webster connection, which is a canonical affine connectionon a contact strongly pseudo-convex CR-manifold. In particular, weclassify a contact strongly pseudo-convex CR-space form(M,eta,varphi) with the pseudo-parallel structure operatorh(=1/2L_{xi}varphi), and then we obtain the nice form of theircurvature tensors in proving Schur-type theorem, where L_xidenote the Lie derivative in the characteristic direction xi.