고속 식부 장치 개발

김경욱 서울대학교 농업개발연구소 2000 농업생명과학연구 Vol.4 No.-

A cam type high-speed transplanting mechanism was developed. The mechanism consists of a cam and an epicycle gear train with one sun gear in the middle and four planet gears in a row but symmetric with respect to the sun gear. Two planting knives are pivoted on the two outer gears. When sun gear rotates with a constant velocity the planting knife rotates also with a constant velocity. This constant motion of the transplanting knife is accelerated partially by a cam fixed in the gear housing so that the locus of the planting knife becomes similar to that generated by a crank-type transplanting mechanism. This cam-type transplanting mechanism can solve the problems associated with the rotary-type transplanting mechanisms. The mechanism was designed with an aid of computer simulation and proved applicable to high speed transplanters by its mock-up model. The design process of the mechanism was presented and dynamic analysis was also carried out to show the advantages of the mechanism over the rotary type high-speed transplanting mechanism.

배추 정식기용 묘 취출기구 개발

김경욱 서울대학교 농업개발연구소 1999 농업생명과학연구 Vol.3 No.-

A simple pick-up device for vegetable transplanters was developed and its work performance was evaluated at the laboratory. The pick-up device extracts seedlings from the 200-cell tray of seedlings and transfers them to the position where they are released to the soil. The device consists of a slider-crank mechanism with the slider moving through a curved groove and a three-linkage mechanism with one slotted link through which the pick-up pin moves back and forth. The path of the curved groove was made by combining a horizontal straight line and a circular arc with its center at the rotational center of the slotted link. The pick-up pin in the slotted link is connected to and driven by the slider of the slider-crank mechanism. When the slider moves through the straight line path of the curved groove the pick-up pin moves on the slotted link which dwells for that instant. When it moves through the circular path the pick-up pin rotates together with the slotted link about its center. This device is simpler in its structure and showed a good work performance compared with those employed to the current vegetable transplanters. The work performance of the device was evaluated by varying the operational conditions such as age of seedling, pick-up method, approach angle of pick-up pin to the seedling, penetration depth of pick-up pin and pick-up velocity. The best performance was obtained when the pick-up pin gripped the root with soil at a penetration depth of 41 mm in a 43 mm-depth plug cell. The best approach angle of the pick-up pin to the plug was normal to the middle part of the plug surface. The pick-up device can pick up 30 seedlings per minute and showed a success ratio of 97% using the seedlings of 23 days old. The developed pick-up device will be used for the vegetable transplanter being under development and tested in the field before it becomes as a commercialized unit.

桔梗의 內部構造規格設定에 관한 硏究

金鍾旭,金弘寯,朱榮丞,陸相元,韓京植 대한본초학회 2000 大韓本草學會誌 Vol.15 No.2

In order to strengthen objectivity and availability of oriental herb medicine, the standard formula for herbs has been attempted to set up by experimenting and documentary testing original herbs which were recorded in authorized document. The object herb medicines are Platycodi Radix. The internal morphological standard in this study is expected to supply the search for several physiochemical reaction, biological reaction, determination of indicator material and identification of gene with basic sources in the future. The result of study is as follows; In the shape of real herbs, I compared current herbs in market with original herbs which were just collected or were on the course of drying. It was possible that the internal shape could be identified by using microscope after butanol series. In powder herbs, it was possible to purify the shape by microscope through maceration of natural and powder herbs. Despite such a useful character, it was difficult to deal with powder herbs because it was uncertain to make a standard for them on account of the crush of these tissue. Since powders shape of herbs in a few documents were regard not as the powder shapes of natural herbs but as the maceration state of them. It is suggested that we should inspect the original herbs which are not crushed yet with a microscope in order to identify crushed shape of powder herbs from now on. An Additional standard establishment including physiochemical reaction and gene research is required in order to supplement the fault of this search.

실횟대(Porocottus tentaculatus) 仔稚漁의 成長에 따른 形態發達

金容億,韓景鎬 여수대학교 1997 論文集 Vol.11 No.2

Porocottus tentaculatus (Kner) caught at Pusan and Yocheon brook was performed in March and April 1994 and 1997. describe the development of larvae and juveniles. Absorption of the yolk was completed at about 6.7㎜ in total length(TL), and possessed 31~33 myomeres. Flexion of the notochord started and finished at about 8.2㎜ in TL and about 10.5㎜ in TL, respectively. Aggregate numbers of all fin rays and vertebrae were completed at over 16.8㎜ in TL. at which time the larvae reached the juvenile stage. The pigment patten became the same as that of adults in juveniles longer than 20.0㎜ in TL. Lateral lines were completed at over 28.5㎜ in TL, at which time the juveniles attained to the young stage.

상악 유전치부의 치간공간과 인접면 우식에 관한 조사연구

김진영,이광희,라지영,안소연,정승열,임경욱,반재혁 大韓小兒齒科學會 2009 大韓小兒齒科學會誌 Vol.36 No.3

본 연구는 상악 유전치부의 치간공간과 인접면 우식의 상관관계를 평가해보고자 하였다. 익산에 거주하는 만3-7세의 어린이 555명을 대상으로 하였으며 탐침이 통과하는지 여부로 치간공간이 있음과 없음으로 분류하였고 와동이 형성되었거나 법랑질 표면이 연화되었을 경우 인접면 우식이 존재하는 것으로 판단하였다. 연구 결과 다음과 같은 결론을 얻었다. 1. 상악 유전치부의 치간공간은 영장류 공간이 77.4%, 발육공간이 유측절치와 유중절치 사이에서 54.4%, 양유중절치 사이에서 39.0%로 나타났다. 2. 인접면 우식발생율은 우측유견치가 6.3%, 우측유측절치가 14.7%, 우측유중절치가 33.5%, 좌측유중절치가 33.7%, 좌측유측절치가 16.0%, 좌측유견치가 4.7%로 나타났다. 3. 치간공간의 수가 많을수록 상악 유전치의 우식발생율은 낮아졌으나 그 상관관계(r=0.024)는 미약하였다. 4. 상악 유전치부에 공간이 존재하지 않을 경우 존재할 때 보다 평균 우식발생율이 높았으며, 치간공간이 전혀 존재하지 않는 경우 한 곳이라도 치간공간이 존재하는 경우보다 평균 우식발생율이 2배 이상 높은 것으로 나타났다. The purpose of this study was to assess the relationship between interdental spaces and proximal caries in maxillary anterior primary teeth. 555 children aged 3-7 inhabit in Iksan were divided into two groups, depending on the presence of interdental space which was detected by a dental explorer. They were determined to have proximal caries if cavity was formed or the enamel surface was softened. The results were as follows : 1. Regarding interdental spaces, 77.4% had primate spaces; 54.4% had developmental spaces between central and lateral incisor, and 39.0% between central incisors. 2. Interproximal caries incidences in right primary canine, lateral incisor, and central incisor were 6.3%, 14.7%, and 33.5%, respectively. Also interproximal caries incidences in left primary central incisor, lateral incisor, and canine were 33.7%, 16.0%, and 4.7%, respectively. 3. Children with more interdental spaces had less caries incidence, but the relationship was weak(r=-0.024). 4. The mean caries incidence was higher in absence of interdental space of maxillary primary incisors than in presence of space. The mean caries incidence with no interdental space was twice as high as that with presence of interdental space.

금속 판재의 성형한계도 시험법에 관한 연구

장욱경,장윤주,김형종 江原大學校 産業技術硏究所 2010 産業技術硏究 Vol.30 No.A

A forming limit diagram (FLD) defines the extent to which specific sheet material can be deformed by drawing, stretching or any combination of those two. To determine the forming limit curve (FLC) accurately, it is necessary to perform the tests under well-organized conditions. In this study, the influence of several geometric or process parameters such as the blank shape and dimensions, strain measuring equipments, test termination time, forming speed and lubricants on the FLC is investigated.

큰가시고기, Gasterosteus aculeatus aculeatus의 産卵行動, 卵發生 및 仔稚漁期의 形態

韓景鎬,金容億 釜山水産大學校 1989 釜山水産大學 硏究報告 Vol.29 No.1-2

1987年 3月15日에 釜山 松亭洞에 位置한 河川에서 投網에 의해 採捕한 큰가시고기 親魚들을 實驗室에 設置된 水槽에서 飼育하면서, 産卵行動을 觀察하였고, 3月24日에 自然産卵한 卵과 人工受精시킨 卵을 材料로 發生過程과 孵化 仔魚의 成長에 따른 外部形態, 稜鱗의 發達過程 및 內部骨格의 骨化過程을 調査한 結果를 要約하면 다음과 같다. 産卵期의 수컷은 婚姻色이 나타나고, 産卵床을 만들며, 텃세行動을 한다. 受精卵은 卵徑이 1.45∼1.65mm로 淡黃色을 띠고 거의 球形이며 多數의 油球를 가진 沈性粘着卵이다. 孵化에 所要된 時間은 飼育水溫 15.65∼18.85℃(平均, 16.35℃)에서 受精後 177時間만에 孵化하였다. 孵化直後의 仔魚는 全長 5.45∼5.60mm(平均, 5.55mm)로 입이 열리기 시작하고, 肛門은 아직 열려 있지 않다. 孵化後 8日째의 仔魚는 全長 7.25∼8.40mm(平均, 7.76mm)로 卵黃이 完全히 吸收되어 後期仔魚에 달한다. 孵化後 31日째의 個體는 全長 11.70∼14.00mm(平均, 13.53mm)로 D.Ⅲ-14, A.Ⅰ-11, P.10, Ⅴ.Ⅰ-1, C.12로 各 기조가 定數에 달하여 稚魚期로 移行한다. 稜鱗은 孵化後 33日째인 全長 13.15∼14.75mm의 稚魚에서 前方側線鱗이 처음으로 發生하고 孵化後 43日째인 全長 16.25mm의 個體에서 꼬리자루 末端에 後方側線鱗이 發達하여 孵化後 60日째인 全長 26.50mm에서 鱗板이 完成된다. 頭蓋骨 및 內臟骨은 孵化 3日째인 全長 6.85mm에서 骨化되기 시작하여 稚魚期에 달한 孵化 37日째의 全長 14.87mm에 이르러 대부분 骨化한다. 脊椎骨은 앞끝에서 發達을 시작하여 뒷쪽으로 骨化가 進行되며, 神經棘과 血管棘은 對應하는 椎體보다 늦게 骨化한다. 骨格은 孵化 3日째인 全長 5.95∼7.35mm의 仔魚에서 攝餌와 呼吸에 연관된 부분부터 먼저 骨化가 일어나, 빠른 速度로 發達이 進行되어 孵化 45日째인 全長 16.65mm를 前後하여 대부분의 骨格이 完成된다. The purpose of present study is to describe the taxonomy and early life history of three-spined stickelback, Gasterosteus aculeatus aculeatus Linnaeus. The adult male of G. aculeatus aculeatus showed the construction of nest and territorial behavior. A courtship behavior of male induced brooding female to the nest. The female spawn at there, thereafter the male protects the nest until larvae can swim out from the nest. A spawning behavior shows species-specific. G. aculeatus aculeatus take about 177 hours to hatch at 15.65˚-18.85℃. The larvae reached 7.76mm at 6 days and 12.50-14.25mm at 31 days after hatching in total length. When the fish reaches to about 26.50mm in total length, the posterior scutes develop to the caudal keel and the anterior scutes like rhombic shape, the number of them was 8-9 and 22-24, respectively. Ossification of all bones was nearly completed at 16.65mm in total length.

넙치(Paralichthys olivaceus)의 초기생활사에 관한 연구 I. 난발생과정 및 仔稚魚의 形態發達

韓景鎬,金容億 여수대학교 1997 論文集 Vol.11 No.2

Artificial fertilization of the flounder, Paralichthys olivaceus(Temminck et Schlegel) caught at Pohang brook was performed in May 19, 1995 and hatched larvae were reared for 50 days to describe the development of eggs and the morphogenesis of larvae and juveniles. The egg is bouyant, colorless and spherical in shape, measuring 0.90~0.94㎜ in diameter(mean: 0.92㎜). Hatching in the indoor tank with 17.60℃ in mean water temperature started from the 50 hours after fertilization. Newly-hatched larvae were measured 2.40~2.53㎜ in total length(TL, mean:2.49㎜), and mouth and anus were not yet open. Melanophores and xanthophores were present on the yolk and membrane fin, and on the dorsal and ventral part of the caudal region. Five days post-hatch larvae transformed to postlarval stage and they were 3.84~4.50㎜ in TL(mean: 4.20㎜). As yolk sac were completely resorbed, mouth and anus were open, and they fed rotifer, Branchionus plicatilis actively. In 18 days after hatching, the larvae grew to 7.85㎜ in TL, number of elongated dorsal fin rays 6~7, and membrane of these hypertrophied rays densely pigmented. Individuals of 11.40~13.25㎜ in TL(30 days after hatching) are regared to have attained to the juvenile stage. All the fins were well formed with complete set of fin rays(D. 76~83; A. 60~65; P. 14~16; V.6; C.18~19).

원위 전대뇌동맥류의 외과적 치료

성경훈,도종웅,강재규,김기욱 대한신경외과학회 1990 Journal of Korean neurosurgical society Vol.19 No.6

The authors described a more different type of aneurysms in the distal anterior cerebral artery (DACA), which is difficult to approach surgically. There are anomalies of distal anterior cerebral artery in about one fourth and narrow space, which made more careful surgical dissection. We experienced 7 cases of DACA aneurysm, 6 cases of which were treated surgically through the interhemispheric approach via the unilateral frontal paramedian craniotomy on the non-dominant side. Surgical results were anatomical complexities, modem microsurgical technique aided by microscope make the approach more exactly and safely.

넙치(Paralichthys olivaceus)의 초기생활사 : ll. 仔稚魚의 골격발달 ll. Osteological Development of Larvae and Juveniles

韓景鎬,金容億 여수대학교 1998 論文集 Vol.13 No.2

넙치 친어를 1995년 5월 19일 오전 8시에 경상북도 포항시 종묘배양장에서 건식법으로 인공수정한 후 수정난에서 孵化한 仔魚를 사육하면서 孵化後 50일까지 매일 10개체를 무작위 추출하여 5% 중성 formalin에 고정시킨 뒤 표본을 염색하여 성장에 따른 골격의 정상적인 發達 過程을 관찰하였다. 1. 孵化後 6∼7일째인 全長 3.75∼3.87㎜의 仔魚에서 額骨과 頭蓋骨이 가장 먼저 骨化되기 시작한다. 2. 脊椎骨은 腹椎骨이 먼저 發達하여 尾椎骨 쪽으로 骨化가 진행되며 각 椎骨에 대응하는 神經棘과 血管棘이 椎體보다 먼저 骨化한다. 3. 腰帶骨은 肩帶部의 鎖骨 下部에 접착되어 있다. 4. 담기골은 脊椎骨과 각 지느러미 연조가 거의 완성된 후에 骨化한다. 5. 尾骨의 尾部棒狀骨은 앞의 椎體와 거의 동시에 骨化하기 시작한다. 6. 모든 내부 골격은 全長 14.60∼20.90㎜ 전후(孵化後 40∼50일째)에 肩帶骨과 腰帶骨이 완전하게 骨化됨으로서 모두 완성된다. The flounder, Paralichthys olivaceus (Temminck et Schlegel) used in the experimental were caught at Pohang brook was performed in May 19, 195 and hatched larvae were reared for 50 days to describe the osteological development of larvae and juveniles. Ossification of the cranium took place at 4.75㎜ of mean total length(MTL) in frontal, supraoccipital, parasphenoid and sphenotic. Ossification of the viseral skeleton occurred in areas where active movements of bones were required, notable in the parts for feeding(premaxillary, dentary, articular) and respiration(opercle, prepercle). Vertebrate began to develop from the anterior end and to ossify posteriorly. Neural and haemal spines of vertebrae ossified always prior to the corresponding centra. In jaw bones, maxillary and a part of dentary appeared first at 4.75㎜ of MTL and attained a fundamental structure at 6.47㎜ of MTL. Ossification of all bones was nearly completed at 16.80㎜ in MTL(45 day after hatching).