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골프 스윙 시 선수와 비선수의 두부 분절 움직임 패턴 비교: 골프 헤드업에 관한 해석
손지훈 ( Sohn Jee-hoon ),구도훈 ( Koo Do-hoon ) 한국융합과학회 2022 한국융합과학회지 Vol.11 No.8
연구목적 본 연구는 골프 샷의 명언 중 하나인 'Do not head up'에 대한 운동학적 분석을 수행하고 그것을 해석하는 것에 목적이 있다. 연구방법 엘리트 골프 선수 8명과 비선수 10명의 5번 아이언 샷을 측정한 뒤, 스윙 구간 전체에서 머리 움직임 변화를 분석하였다. 스윙 구간은 어드레스(AD), 미들 오브 백스윙(MBS), 백스윙 탑(BST), 미들 오브 다운스윙(MDS), 임팩트(IMP), 미들 오브 폴로스루(MF)로 구분하였다. 적외선 기반 3차원 동작분석 시스템을 사용하였다. 머리 분절 좌우 관자놀이에 부착한 2개의 적외선 반사 마커 중심을 머리의 움직임으로 정의하였다. 골프 스윙 시 정의된 머리 분절의 3차원적 움직임을 집단 간 비교하였다. 결과 선수의 경우 머리의 움직임이 백스윙 시 우측(-y 축 방향), 하방(-z 축 방향)으로 움직임이 나타나고, 다운스윙 시 좌측(+y 축 방향), 후방(-x 축 방향), 하방(-z 축 방향) 의 방향으로 3차원 공간에서 머리 움직임이 나타났다. 비선수들은 백스윙 시 이미 머리 위치가 높아지면서 임팩트 시 머리 위치가 충분히 내려오지 못하는 패턴을 보였다. 선수들은 다운스윙 시 일관된 머리 움직임이 타나났으나, 비선수의 경우는 피험자 간 각기 다른 패턴의 머리 움직임을 보였다. 결론 골프 코칭 시 '머리를 들지 마라라는 격언으로는 부족하다. 골프 스윙 동작 시 머리 움직임의 3차원적 피드백이 제공되어야 올바른 머리 움직임을 바탕으로 골프 스윙이 이루어질 수 있을 것이다. Purpose The purpose of this study is to analyze the head movements of elite golfers and non-players during golf swings to interpret the meaning of head-ups kinematically. Method After measuring the 5th iron shot of 8 elite golfers and 10 non-players, the change in head movement was analyzed throughout the swing section. Swing sections were divided into address (AD), middle of back swing (MBS), back swing top (BST), middle of down swing (MDS), impact (IMP), and middle of through (MF). An infrared-based three-dimensional motion analysis system was used. The center of the two infrared reflective markers attached to the left and right temples of the head segment was defined as the movement of the head. The three-dimensional movements of the head segment defined during the golf swing were compared between groups. Result In the case of the eltie golfers, the movement of the head appeared in the right(-y axis direction) and downward directions(-z axis direction) during the backswing, and the movement of the head appeared in the three-dimensional space to the left(+y axis direction), post direction(-x axis direction), and downward(-z axis direction) directions during the downswing. Non-elite golfers showed a pattern in which the head position was not sufficiently lowered during impact as the head position was because of already increased haead position during the backswing. The elite golfers showed consistent head movements during downswing, but in the case of non-athletes, they showed different head movements between subjects. Conclusion When coaching golf, the adage Do not head up is not enough. In the case of a golf swing motion, three-dimensional feedback of the head movement might be provided so that the golf swing can be achieved based on the correct head movement.
Chondroblastoma : MR Characteristics with Pathologic Correlation
Jee, Won-Hee,Park, Yong-Koo,McCauly, Thomas R.,Choi, Kyu-Ho,Ryu, Kyung-Nam,Suh, Jin-Suck,Cho, Jae-Hyun,Lee, Jeong-Hoon,park, Jung-Mi,Lee, Youn-Soo,Ok, In-Young,Kim, Jung-Man 가톨릭대학교 2000 Bulletin of The Catholic Research Institutes of Me Vol.28 No.-
Purpose : The purpose of this study was to describe the MR findings of chondroblastoma with pathologic correlation. Method : In 22 patients with pathologically proven chondroblastoma, MR signal characteristics were correlated with pathological findings. Results : On T2-weighted images, 12 (55%) lesions were hyperintense with hypointense areas in 9 lesions, whereas 10 (45%) were hypointense. Therfore, 19 of 22 (86%) lesions with pathologic correlation had hypointenes areas entirely (n=10) or partly (n=9) on T2-weighted images On gadolinium-enhanced images, 13 (59%) lesions showed lobular enhancement and 9 (41%) showed marginal and septal enhancement. Low signal intensity on T2-weighted MR images was most strongly associated with an abundance of immature chondroid matrix, hypercellularity of the chondroblasts, calcifications, and hemosiderin on histology. Conclusion : Chondroblastoma was found to show hypointense portions on T2-weighted images. Signal intensity on T1- and T2-weighted MR images in chondroblastoma was dependent on the amounts of histopathological components. (Jornal of Computer Assisted Tomography 23(5):781-726, 1999)
범게, Orithyia sinica 유생의 생존과 성장에 미치는 암모니아와 아질산의 영향
구자근,김종만,장차환,지정훈,강주찬 한국어병학회 2004 한국어병학회지 Vol.17 No.1
범게, Orithyia sinica 유생을 대상으로 암모니아와 아질산에 대한 생존 및 성장에 관한 실험을 실시하였다. 암모니아 노출 실험구에서 zoea기 유생은 노출 20일후, 대조구가 80%의 생존율을 나타내었지만 10㎎/L 이상의 실험구에서는 37-45%의 생존율을 나타내었고, megalopa기 유생에서도 유사한 경향을 나타내었다. 암모니아가 범게 유생의 성장에 미치는 영향을 조사한 결과, zoea기 유생은 20㎎/L 이상의 농도에서 megaloparl 유생은 50㎎/L 이상의 농도에서 유의한 차이를 나타내었다. (P<0.05). 아질산 노출 실험에서는 zoea기 유생과 meglaopa기 유생에서 농도와 노출기간에 비례하여 생존율이 감소하였으며, 특히 150㎎/L 이상의 아질산 농도에 노출된 zoea기 유생가 megalopa기 유생은 대조구와 비교하여 유의한 성장 지연을 나타내었다(P<0.05). This study investigates the influence of waterborne ammonia and nitrite on the zoea and megalopa stage larvae of tiger crab, Orithyiu sinicu under laboratory condition, focusing on the effects on survival and growth as deleterious responses of toxicant. Survival rate of zoea stage larvae exposed to control levels, and to 5, 10,20 and 50 ㎎/L total ammonia-N, using a continuous flow system for 20 days was 80, 77, 45, 40 and 37%, respectively. Growth rate of zoea stage larvae exposed to 20 and 50 ㎎/L total ammonia was significantly lower than in controls after 20 days (P< 0.05). Survival rate and growth rate of megalopa stage larvae exposed to ammonia also decreased at greater than 10 and 50 ㎎/L, respectively. In the nitrite exposure experiment with zoea and megalopa stage larvae of tiger crab, survival rate was decreased in a concentration and exposure period-dependent way. The growth rate of zoea and megalopa stage larvae of tiger crab exposed to nitrite decreased at greater than 150 ㎎/L nitrite concentration.
Jee, Jung-Hoon,Koo, Ja-Geun,Keum, Yoo-Hwa,Kang, Joon-Suk,Park, Kwan H A,Kang, Ju-Chan Blackwell Publishing Ltd 2007 Aquaculture research Vol.38 No.1
<P>Abstract</P><P>This study investigated the effects of different types of diet and sediment on the growth parameters of juvenile tiger crab <I>Orithyia sinica</I> under laboratory conditions, focusing on survival, growth and moulting. In the first set of experiments, juvenile tiger crabs were reared with five different types of sediment, i.e., soft sand, coarse sand, soft sand mixed with coarse sand, mud or bare bottom. Soft sand resulted in not only the highest survival rate of 78% but also the best rate of growth and feed intake. Crabs reared with a mud substrate showed the worst results in these parameters. The intermoult period, however, was not affected by sediment types. In the second set of experiments, crabs were fed different types of diet to determine their effects on the same growth parameters. Diets were composed of different combinations with Manila clam (<I>Ruditapes philippinarum</I>), brine shrimp (<I>Artemia nauplii</I>), microencapsulated feeds and marine diatom (<I>Chaetoceros gracilis</I>). Survival and growth in crabs fed Manila clam as a diet component were significantly higher than in those on other diets. The highest survival and growth were achieved with a diet that included all four components. These results provide valuable information on the appropriate bottom substrates and diet types necessary for artificial mass culture of the tiger crab.</P>
수면 중 발생한 대퇴경부 골절로 발견된 직장 소세포암 1예
황지주,전성국,황일순,김은주,임창훈,정호연,한기옥,장학철,윤현구,한인권,문우남,홍성란 대한내과학회 2002 대한내과학회지 Vol.62 No.5
Small cell carcinoma of the colon and rectum is a rare primary epithelial malignancy at this location. Histologically, this tumor represents a spectrum of neuroendocrine differentiation. The neuroendocrine cancers of the colon manifest a highly aggressive behavior, even more than their adenocarcinoma counterpart of the same stage. Small cell carcinoma in the colon has early metastasis and the prognosis is extremely poor. We report a case of small cell carcinoma of the rectum manifesting as femur neck fracture during sleep.
단기정신병적 장애로 진단된 담기울결형(痰氣鬱結型) 전증(癲證) 환자 1례(例)
김지훈 ( Jee Hoon Kim ),유종호 ( Jong Ho Yoo ),구병수 ( Byung Soo Koo ),김근우 ( Geun Woo Kim ) 대한한방신경정신과학회 2007 동의신경정신과학회지 Vol.18 No.3
Jeon-zeong(癲證) is mostly caused by anxiety and melancholy, impairment of heart and the spleen, or stasis of phlegm-Gi and heart confused by phlegm. Its manifestation are characterized by depression, expressionlessness, inclination for quietness, self muttering and hallucinating, caprice in crying and laughing, paraphasia, loss of appetite, unawareness of filth and cleanness, etc.We experienced a 50year-old man who had brief psychotic disorder that specified with Marked Stressor and whose condition was improved through oriental medical treatment.We treated the patient with Herbal medications and Giungoroen (至言高論-wise saying and lofty opinion) and Relaxation therapy.After being treated, the patient showed that symptoms (insomnia, anxiety, depression) was improved considerably. This result suggests that oriental medical treatment has good effect on brief psychotic disorder due to Marked Stressor.