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쌀보리에 있어서 實用形質의 遺傳率, 相互相關, 經路係數 및 品種間 差異에 關한 硏究
金翰琳,任性彦 濟州大學校亞熱帶農業硏究所 1991 亞熱帶農業硏究 Vol.8 No.-
쌀보리 育種에 있어서 主要形質의 遺傳率 相互相關 및 經路係數를 究明하기 위하여 白胴外 15品種을 11月 10日과 11月 25日 2回 播種하고 이들에 對한 實用形質을 調査하여 播種期 移動에 따른 品種間 形質의 變化 遺傳率, 遺傳相關, 表現型相關, 環境相關 및 經路係數를 調査한 結果는 다음과 같다. 1. 出穗 및 成熟日數는 早播에서는 길고 晩播는 짧아졌으며 濟州道에서는 11月 10日에 播種하는 것이 種實收量도 많고 收量構成要素의 形質發現이 良好하였다. 2. 稈長,과 穗長은 早播보다 晩播에서 짧아지는 傾向이며, 品種間에는 差異가 컸다. 3. 種實收量, ㎡當穗數, 一穗粒數는 早播보다 晩播에서 急激히 減少되었고, 千粒重은 播種期間 差異가 적었다. 4. 播種期別 形質의 平均 遺傳率은 出芽日數, 出穗日數, 成熟日數, ㎡當穗數가 가장 높고, 稈長, 千粒重, 種實收量이 中間程度였으며,穗長이 가장 낮았다. 播種期 移動에 따른 遺傳率 變化는 出穗日數, 成熟日數, ㎡當穗數,種實收量이 變動이 적었고, 屑粒種의 變異가 크게 나타났다. 5. 形質間 相關은 播種期에 따라 다르며, 一定한 傾向이 없었다. 種實收量과 ㎡當穗數, 一穗粒數, 千粒重間에 遺傳相關係數는 播種期에 전혀 關係없이 높아 多數性 品種選別의 指標가 되는 것으로 認定되었다. 6. 種實收量에 對한 主要形質의 經路係數는 두 播種期와 名 形質을 全體的으로 볼 때 千粒重, ㎡當穗數, 一穗粒數의 直接 및 間接效果가 높아, 이들 形質이 種實收量에 對한 寄與度가 컸었다. This study was carried out to investigate heritabilities, genotypic, phenotypic and environmental correlations, and path coefficients among the agronomic characters of naked barley (Hordeum vulgare L. emend Lamark) on two seeding dates. Sixteen different cultivars, including Baekdong, were seeded on November 10th and 25th, 1983. The results obtained are summarized as follows ; 1. The days of heading and maturity were prolonged in early seeding, and were shotened in late seeding. Seeding on November 10th resulted in good yield components, and heavy production of grains. 2. The culm and the head were shorter in late seeding than in early seeding. There were significant differences among the cultivars in these characters. 3. The late seeding decreased the grain yield, the number of heads per ㎡ and grains per head, but did not decreased the weight of 1,000 grains. 4. On both seeding dates, the heritabilities of the number of heads per ㎡, the emergence and the maturing days were high, those of the culm length, the weight of 1,000 grains and the grain yield were medium, and that of head length were low. changes in the heritabilities of the heading and ma turing days, the number of heads and the grain yield were not considerable, but that of the weight of aborted grains was considerable when seeding dates were altered. 5. There was no definite tendency of correlations among characters according to seeding dates. The grain yield had high genotypic correlations with the number of heads and grains per head on both seeding dates. It was realized that these characters were useful selection criteria for grain yield. 6. Direct and indirect effects of 1,000 grain weight, the number of heads and grains per head versus the grain yield were high on both seeding dates, that is, these characters had a large influence on the grain yield.
BTA드릴에 의한 심공가공시 최적절삭조건과 공구수명에 관한 연구
장성규,이충일,전언찬,안찬우,김현수 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.2
The BTA deep hole machining has an increasing because of its wide range applications and its good productivity. The BTA tools are capable fo machining for having a large length to diameter ratio in single pass. It's really necessary that the research for machining of the deep hole drilling by the BTA drilling because its required quality should be satisfied with one time machining. In machining deep holes by single edge BTA drill, P10 class of tool material out of single tube BTA drilling system, we got the result of our study of selecting the optimum cutting condition and tool life for an object, SM55C through our testing as follows. (1) Cutting speed V=42m/min, and feed speed F=90mm/min is the optimum cutting condition and the tool life was about 10 meters. (2) The testing was shown surface roughness was 12㎛, and the roundness was less 16㎛.
장성규,전언찬,김대원 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2
High performance ABS have been introduced in the market because car manufacturers and drives have been recongnized the important safety function of these systems. In the beginning of ABS introduction only luxury vehicles where equipped with ABS because of the high additional cost. Today there is the medium and even compact vehicle class. Therefore it became a necessity to develop an ABS which meets the requirements of manufacturers and drivers concerning performance comfort and especially cost. As a highly advanced technology and skills which include electronic, hydraulic controls, element design and manufacturing technology. ABS system has recently been entered into mass production as a result of long research and many try and errors. In this research, we tested MKⅣ-G ABS system, which was developed by ITT automotive, in various methods and got the quite good results in its function. MKⅣ-G ABS system can be extended to TCS(Traction Control System) function and is now under developing by localization in domestic. But on demand car manufactures and customers, new generation ABS system, that means simple, low cost and high function, is already under developing among advanced nations in this area. Although we are still in early stage of ABS system development, if we analyze and study the function of various ABS system through these research and put it to practical use step by step, we can develop independent ABS model in the near future.
장성규,변상기,이승수,김현수,전언찬 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
Among the cutting process, recently hole processing in one of extensive using. This study, we made use of the 3 point edge drill. Regarding the cutting efficiency, we investigated the shape of cutting hole and studied cutting hole, a slope of center shaft, roundness and surface roughness. By using carbide 3 point cutting edge, compare with 2 cutting edge, it is possible that high precision drill processing and near the hole, at extremely limited area, quantity of magnification is a little big. After 15m cutting distance, a gradient of center shaft values was fixed 22㎛. It is necessary that a sufficient consideration concerned with jig intensity of workpiece, cutting conditions etc.
김성언(Seong Eon Kim),김행석(Haeng Seok Kim),김종경(Jong Kyeong Kim),오지원(Chee Won Oh),송계용(Gye Yong Song),김태흥(Tae Heung Kim) 대한피부과학회 2002 대한피부과학회지 Vol.40 No.2
Linear focal elastosis is characterized clinically by horizontal yellowish palpable striae on the lower back and histologically fragmentation or aggregation of elastic fibers. We herein report four cases of linear focal elastosis in male patients. They were 12 to 17 years old and the disease duration was 1 to 3 years. We suggest linear focal elastosis is a variant of striae distensae affecting elastic fibers.
김기홍,신동훈,김현석,최종수,김성용,김미진,성언기 대한피부과학회 1999 大韓皮膚科學會誌 Vol.37 No.2
Background : Psoriasis is a common, scaly erythematous disease of unknown etiology, marked by remissions and exacerbations of unpredictable onset and duration. Among many etiologic factors, psoriatic keratinocyte is found to play the most important role. Objeetive : The purpose of this study is to evaluate the hypothesis that the mechanisms) responsible for the almormal proliferation of psoriatic keratinocytes may be located within the cell themselves. Methods : Human epidermal keratinocytes were isolated from lesion(PL) and from uninvolved skin (PN) with chronic plaque-like psoriasis and from the normal skin(NN). Keratinocytes were passaged onto culture vessels without the feeder layer and maintained with serum free medium. Growth rates were measured in secondary cultures by MTT assay and ultrastructural findings of cell differentiation were evaluated with a transmission electron microscope. Results : 1. Keratinocytes from PL reached 50%m confluency in one week compared to two weeks of PN and NN in primary cultures. 2. By the MTT assay, keratinocyte proliferation from PL showed a significantly faster rate than those from PN and NN(p$lt;0.01). But there was no significant difference of keratinocyte proliferation rate between PN and NN(p$gt;0.05). 3. All of the three cell populations(PL, PN, NN) showed variable degrees of cell differentiation during secondary culturing in a serum-free medium. In the PL, however, small, compact basal cells were more prevalent than PN and NN. 4. When keratinocytes underwent differentiation by culturing in DMEM with senun, keratinocytes from PL formed more cell layers with incomplete formation of cornified envelopes suggests the presence of some unknown factors that induce or promote psoriasis. While keratinacytes from PN and NN were characterized by a complete cornified layer as in normal skin. Conclusion : These results indicated that the characteristic hyperproliferation and the defective terminal differentiation of keratinocytes of PL were maintained throughout the culture period.