원전기기 부품의 수명추정 및 활성화 에너지측정

김재형,김유창,김병덕,Kim, Jae-Hyeong,Kim, Yu-Chang,Kim, Byeong-Deok 재료연구소 2001 機械와 材料 Vol.13 No.4

앵글씨 분류에 의한 성인 골격구조 및 하악운동량 평가

김재형,김병국,최홍란,Kim, Jae-Hyung,Kim, Byung-Gook,Choi, Hong-Ran 대한안면통증구강내과학회 2001 Journal of Oral Medicine and Pain Vol.26 No.2

The purpose of this study was to identify the difference of vertical movement of mandible according to Angle's molar relationship and by skeletal factors affect to vertical movement of mandible. 172(age ranged from 20 to 30) subjects who go to college within territory of Kwangju city without any experience of temporomandibular disorder, extraction and orthodontic treatment. were selected for this study. The subjects were classified into class I(male:30, female:49), class II(male:18, female:24) and class III(male:18, female:33) according to Angle's molar relationship. The distance was measured between incisal edge of maxillary and mandibular central incisor and between bottom of central fossa of maxillary and mandibular 1st molar with ruler. The arch length and width were measured on the diagnostic cast. Cephalometrics were taken and then traced. Landmarks were identified and analyzed. 1. Maximal interincisal opening of male is larger than that of female in class I, class II and class III. Among each group maximal interincisal distance is the largest in class III. Maximal intermolar distance of male is superior to that of female in class I, class II, and class III, but there is no siginficant difference among them. 2. On maximal opening movement of Angle's classification class I and class II, total mandibular length, mandibular ramal length, madibular inferior border length and upper arch width were important variables and facial length, upper arch length and lower arch length had negative relationship to that. On maximal opening movement of Angle's class III, the upper arch length, the lower arch length and anterior facial length were important variables especially when compared with class I and II, and upper arch width had negative relationship. These results suggest that maximal opening movement is affected by facial morphology in all classes, but each group is affected by different facial skeletal variables. Accordingly, facioskeletal variables might be considered as diagnosis and treatment to improve the amount of mouth opening.

유럽의 방역관리 및 질병예방을 위한 관리 포인트

김재형,Kim, Jae-Hyeong 대한양돈협회 2007 養豚 Vol.29 No.3

경제성.친환경성 앞세워 '시장확대' 기대

김재형,Kim, Jae-Hyeong 한국LP가스공업협회 2009 LP가스 Vol.21 No.1

MSY 22두 농장을 만들기 '후보돈 관리'

김재형,Kim, Jae-Hyeong 축산물품질평가원 2009 KAPE누리 Vol.153 No.-

요즘 양돈 산업의 가장 큰 화두는 생산성 향상이라 할 수 있다. 고환율과 고곡물가로 비롯된 사료 가격의 인상은 농장의 생산비를 높여서 아무리 올해 고돈가를 형성해도 저생산성 수익을 보장할 수 없는 것이 현실이다. 반면에 생산성이 확보된 농장은 고생산비에도 불구하고 작년에 모돈 100두당 1억 이상의 수익을 올리고 올해 더 큰 수익을 예상하고 있는 것이 사실이다. 작년 폐사 회원농가 중 모돈 500두에 10억 이상의 수익을 올린 농장이 있으니 양돈 산업에도 부익부 빈익빈 현상이 심화 되고 있는 것이 요즌 필드 현상이라 할 수 있다. "잘되는 농장은 왜 잘 될까"하는 의문은 양돈 산업에 종사하는 사람들은 다들 궁금하게 생각할 것이다. 본고에서는 MSY(모돈두당연간출하두수) 22두를 기록하는 농장의 핵심 경영 전략 중 후보돈 및 모돈관리에 대한 부분을 서술하고 그 경영 노하우를 공유하는 좋은 시간이 되었으면 한다.

Fall cone과 수화열을 이용한 흙-시멘트 혼합물의 상 변화 연구

김재형,원정윤,김성필,장병욱,Kim Jae-Hyung,Won Jeong-Yun,Kim Sung-Pil,Chang Pyoung-Wuck 한국지반공학회 2004 한국지반공학회논문집 Vol.20 No.9

고함수비 상태의 흙에 시멘트를 첨가하게 되면 흙의 공학적 성질을 개량할 수 있다. 이렇게 고함수비 흙에 시멘트를 혼합하는 경우 흙시멘트 혼합물의 워커빌러티와 밀접한 관련이 있는 상 변화를 예측하고 구분하는 것은 매우 힘들다. 시간에 따른 시멘트 paste의 수화열 변화와 경도의 변화는 흙시멘트 혼합물의 상 변화에 대한 유용한 정보를 제공해준다. 본 연구에서는 시멘트 paste와 흙/시멘트 비를 달리 한 3 종류의 혼합물에 대해 수화열과 콘 관입량을 측정하여 흙시멘트 혼합물의 상 변화를 관찰하였다. 실험결과, 흙시멘트 혼합물의 상 변화는 시멘트 paste와 동일한 형태를 보이며 수화열이 최소가 되는 시점에서 혼합물의 전단강도가 급격하게 증가함을 알 수 있었다. 흙시멘트 혼합물의 초결시점은 fall cone 관입량이 1.0mm, 즉 혼합물이 소성상태에 도달하는 시점과 일치하며 흙/시멘트 비가 증가할수록 초결시간은 지연되었다. 흙시멘트 혼합물에 대한 수화열 측정과 fall cone 관입량 측정은 흙-시멘트 혼합물의 상 변화를 예측하는 유용한 수단으로 사용할 수 있다. Some amount of cements can be added into the soil with high water content to improve the engineering properties. In such a case, it is difficult to predict and figure out the phase changes of the soil-cement mixture which is closely associated with workability of the soil-cement mixture. Changes in heat of hydration and hardness of the cement pastes are known to provide the useful information about the phase changes of the soil-cement mixtures. In this study, heat of hydration and cone penetration depth were measured from the specimens of cement paste and 3 soil-cement mixtures. From the experimental results, it was found that the phase changes of the soil-cement mixtures are the same as those of cement paste, and that shear strength of the mixtures abruptly increases when the heat of hydration is minimum. Initial setting time of the mixtures coincides with the state when fall cone penetration depth was 1.0 mm and it is defined as plastic limit of the mixtures. Initial setting time of the mixtures is retarded as soil/cement ratio is increased. Measurements of heat of hydration and fall cone apparatus could be the useful tools to predict the phase changes of tile soil-cement mixtures.

CEO칼럼- 게임의 터전, PC방 일구는 농부를 자처한다

김재형,Kim, Jae-Hyeong 한국데이터베이스진흥원 2004 디지털콘텐츠 Vol.4 No.-

인공시계기반 헬기용 3차원 항법시스템 구성

김재형,유준,곽휘권,Kim, Jae-Hyung,Lyou, Joon,Kwak, Hwy-Kuen 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.3

An artificial vision aided NDGPS/INS system has been developed and tested in the dynamic environment of ground and flight vehicles to evaluate the overall system performance. The results show the significant advantages in position accuracy and situation awareness. Accuracy meets the CAT-I precision approach and landing using NDGPS/INS integration. Also we confirm the proposed system is effective enough to improve flight safety by using artificial vision. The system design, software algorithm, and flight test results are presented in details.

모돈의 번식 생산성 향상을 위한 사료 관리 포인트

김재형,Kim, Jae-Hyeong 대한양돈협회 2007 養豚 Vol.29 No.10

감염성 안구내염의 초음파 소견

김재형,최재완,윤영희,김중곤.Jae-Hyung Kim. M.D.. Jae-Wan Choi. M.D.. Young-Hee Yoon. M.D.. June-Gone Kim. M.D. 대한안과학회 2005 대한안과학회지 Vol.46 No.4

Purpose: To investigate the correlation between ultrasonographic findings and clinical features of infectious endophthalmitis. Methods: We analyzed ultrasonographic findings of 38 eyes of 36 patients who had been diagnosed as having infectious endophthalmitis with various etiologies. The correlation between ultrasonographic findings and clinical features such as initial and final visual acuities were studied. Results: Fourteen eyes were diagnosed with endogenous endophthalmitis and 11 eyes with postoperative endophthalmitis. Posterior vitreous opacity in the endophthalmitis secondary to keratitis was more severe and subhyaloid opacity in the traumatic endophthalmitis was less severe. Coagulase negative staphylococcus was the most common causative agents. Subhyaloid opacity in the eyes where cultures were not performed, was more severe than in those where coagulase negative staphylococcus was identified. Among the various ultrasonographic findings only the degree of the posterior vitreous opacity was correlated with the initial visual acuity, and none of the findings was significantly related with the final visual acuity. Treatment modalities included intravitreal antibiotics injections in 13 eyes, immediate vitrectomies and antibiotics injection in 6 eyes, conversion to vitrectomy after antibiotics injection in 17 eyes, and eviscerations in 2 eyes. The grades of posterior vitreous opacity of the patients with conversion to vitrectomy after antibiotics injection were lower than those of the other groups. Conclusions: Ultrasonographic findings might be a useful factors in the diagnosis and the determination of treatment modality and may therefore be helpful in the prognosis of patients with suspected infectious endophthalmitis.