테니스 포핸드 발리와 백핸드 발리의 운동학적 분석

윤희중,강관희,김태삼 한국체육대학교 체육과학연구소 2000 韓國體育大學校附屬 體育科學硏究所論文集 Vol.19 No.1

This study is to analyze the kinematic variables of forehand and back- hand volley in tennis. Five male tennis players are used as subjects, two S-VHS video cameras set in 60frames/sec were used for recording volley motion. Coordinated raw position data through digitizing are smoothing by low-pass Butterworth filtering method at a cut off frequency 6Hz, and the direct linear transformation(DLT) method was employed to obtain 3-D position coordinates. The conclusions were as follows; 1.In the swing time, forehand volley was longer than backhand volley in phase1, but forehand volley was shorter than backhand volley in phase2, forehand volley was shorter than backhand volley in the total swing time. 2.Backhand volley was longer than forehand volley in displacement of Y axis direction and the height of CG was similar to the forehand and backhand volley in total swing phase. 3.At the point of impact, the resultant velocity of racket head was similar to the forehand and backhand volley, and the maximal resultant velocity of racket head occurred before impact. 4.In the angle of the frontal trunk, the wrist and the knee, forehand volley was larger than backhand volley in each event, and each segment angle increased before impact to except the wrist angle of backhand volley. 5.In the angular velocity of the wrist, forehand volley was positive addition and backhand volley was negative addition at impact.

할로겐화 탄화수소의 흡착제거기술 Ⅱ. Pressure Swing Adsorption 공정에 의한 할로겐화 탄화수소/공기 혼합물의 분리

이태진,안희관,김윤갑,강석호 嶺南大學校 環境問題硏究所 1990 環境硏究 Vol.10 No.1

An experimental study was performed for the bulk separation of halogenated hydrocarbons and air mixture(CF₂Cl₂/air, CH₂Cl₂/air=0.1/99.9 Vol.%) in a pressure swing adsorption (PSA) process packed with various adsorbents, The PSA process cycle comprised four stes : I pressurizaton, II adsorption, III countercurrent depressurrzation, IV purge. The order of appearance of break-through curve is MS-5A > MS-13X > W-AC > S-AC for CF₂Cl₂/Air and W-AC > S-AC > MS-13X for CH₂Cl₂/Air respectively. The separation effects for the variation of adsorption pressure were investigated. In a steady state PSA cycles, high purity air from step II and CFCs-rich gas from step IV were obtained.

Paste법에 의한 0.1V강의 침붕처리에 관한 연구

권동일,김강형,김진관,이성훈,윤재홍 國立 昌原大學校 産業技術硏究所 1994 産技硏論文集 Vol.8 No.-

0.1V강의 표면경도를 향상시키기 위해서 Boronizing처리를 실시하여 Hv=1500∼2000의 높은 경도값을 나타내는 붕화물층을 얻었다. 붕화물층의 두께와 처리시간과의 사이에는 방물선관계를 나타내었으며 붕화물층 생성 겉보기 활성화에너지는 94kJ/mol이다. 또한 900˚C, 3시간 침붕처리했을 때가 가장 높은 경도분포값을 나타내었으며 그 이상 장시간 처리하면 오히려 경도가 감소하는 경향을 나타낸다. 그리고 침붕층은 20% HCl, 20% H₂SO₄용액에서는 뛰어난 내식성을 가지나, 20% HNO₃용액에 대해서는 상대적으로 내식성이 떨어졌다. 그리고 내고온산화성은 대기중 800˚C까지는 침붕처리한 시편이 우수했으나 900˚C부터는 오히려 감소했다. To improve the surface hardness of the 0.1V steel, by Boronizing Treatment, We got boride layer showing high hardness, Hv=1500∼2000. A parabola relationship was appeared between boride layer thickness and treatment time, and apparent activation energy to form the boride layer 94kJ/mol. Moreover, We obtained the most high hardness distribution value when had the boronizing treatment for 3 hours at 900˚C. On the contrary, If we did boronizing treatment above 3 hours, the hardness appeared decreasing tendency. The boride layer had a good corrosion resistance at a solution of 20% HCl and 20% H₂SO₄, but correlatively the corrosion resistance of the boride layer was declined at a solution of 20% HNO₃. And the boronized specimen had a good high temperature oxidation resistance until 800˚C in the atmosphere but the high temperature oxidation resistance go down above 900˚C.

진행 위암환자에서 Lymphokine-Activated Killer (LAK) 활성의 저하

홍원선,김영환,송재관,강윤구,이진오,강태웅,김정룡 대한내과학회 1990 대한내과학회지 Vol.38 No.3

Natural killer(NK) and lymphokine-activated killer(LAK) activities were determined in 31 patients with unresectable stomach cancer before and immediately after chemotherapy with 5-fluorouracil, adriamycin and mitomycin C(FAM) and 31 healthy volunteers. The major purposes of the study were focused on whether peripheral blood lymphocytes(PBL) in stomach cancer patients had a similar ability in the generation of LAK activity to those in healthy volunteers and what the effect was of chemotherapy with FAM on the generation of LAK activity. LAK cells were generated in vitro by culturing human PBL with 100 U/㎖ of recombinant human interleukin-2(rH-IL-2) for 72 hours. K562(human myelogenous leukemia cell line) and MKN-45(human stomach adenocarcinoma cell line) were used as target cells for NK and LAK activities. NK activity against K562, a sensitive line, was significantly depressed in patients with stomach cancer compared with that in healthy volunteers(p<0.01). However, LAK activity against K562 was similar to that of the controls. Age, sex and performance status(ECOG 0-2 and 3-4) did not have an influence on both NK and LAK activities. LAK activity was significantly higher than NK activity, either against K562 or MKN-45, in both healthy volunteers and patients with stomach cancer(p<0.001). NK and LAK activities against MKN-45, a NK-resistant line, in patients with stomach cancer showed significantly lower levels than those in healthy volunteers. We also analyzed the effect of chemotherapy with FAM on NK and LAK activities, with no suppression of NK and LAK activities being observed. In this study, we have demonstrated that PBL of stomach cancer have a reduced ability to generate LAK activity in response to rH-IL-2. However, LAK activity generated from PBL receiving chemotherapy with FAM was similar to that of PBL without chemotherapy.

사람폐암세포주 (PC-14)에서 Cyclosporin A에 의한 Adriamycin 내성의 극복

김영환,홍원선,송재관,강윤구,이진오,강태웅,김건열,한용철 대한내과학회 1990 대한내과학회지 Vol.38 No.3

Cyclosporin A and verapamil were tested using MTT assay to evalute the modification effect on the resistance to adriamycin in a human lung cancer cell line(PC-14) and its resistant subline(PC-14/A). PC-14/A was derived by the continuous exposure of PC-14 to incremental concentrations of adriamycin. PC-14/A was 2.5 times more resistant to adriamycin in terms of ICso than PC-14. Cyclosporin A alone, at a concentration of 2.5㎍/㎖, inhibited the growth of PC-14 to 68.3%. 2.5㎍/ ㎖ and 5.0㎍/㎖ of cyclosporin A showed an increase in the cytotoxicity of adriamycin (p<0.01) with 5.0㎍/㎖ being greater than 2.5㎍/㎖(p<0.01). Excluding the direct cytotoxic effect, however, cyclosporin A did not increase in the sensitivity of PC-14 to adriamycin but only showed an additional cytotoxic effect with adriamycin. Verapamil (up to 6.0㎍/㎖) did not inhibit the growth of PC-14. 3.0㎍/㎖ of verapamil did not increase the cytotoxic effect of adriamycin. The combination of cyclosporin A and verapamil with adriamycin enhanced the cytotoxicity of adriamycin, but the result was similar to that of cyclosporin A with adriamycin. 5.0㎍/㎖ of cyclosporin A modified the adriamycin resistance of PC-14/A(SR, 3.2). However, 3.0㎍/㎖ of verapamil did not significantly reverse the adriamycin resistance of PC-14/A. The modified effect of the combination of 5.0㎍/㎖ of cyclosporin A and 3.0㎍/㎖ of verapamil was similar to that of 5.0㎍/㎖ of cyclosporin A alone in PC-14/A. These results demonstrate that cyclosporin A has an additional cytotoxic effect with adriamycin in PC-14 and PC-14/A and has overcome the acquired resistance to adriamycin in PC-14/A. They also suggest that cyclospoin A may have the therapeutic potential in the treatment of human lung cancer.

21세기 새로운 시대를 준비하는 원광대학교 의과대학의 교육목표 개정과정

이학승,김요식,송윤강,오재민,양연식,정선관 원광대학교 의과학연구소 2009 圓光醫科學 Vol.24 No.1

교육목적은 대학의 교육이 지향하는 대전제이다. 그러므로 대학교육 목적과 목표가 어떤가에 따라 교육과정과 교육방법이 달라진다. 원광대학교 의과대학의 교육목표는, '지덕겸수'로 요약되는 '과학과 도학을 겸비한 전인교육'의 건학정신과 '학술탐구'와 '덕성함양'의 원광대학교 교육목표와 일치하게 현재까지 유지되었다. 그러나 현행 교육목표의 여러 문제점이 발견되었고, 시대상의 변화에 따라 원광대학교 의과대학에서도 사회적 변화 빛 의료인에 대한 시대적 요구에 걸맞은 의학교육의 목적 및 목표의 재설정 과정을 시작하게 되었다. 그 결과 개정 작업을 통해 새로운 교육목표를 설정하게 되었으며 그 내용은 다음과 같다. 1. 기본진료능력을 지닌 의사를 양성한다. 2. 원불교 교리 이념을 반영한 윤리적, 도덕적인 의사를 양성한다. 3. 평생 학습하는 연구하는 의사 혹은 의과학자를 양성한다. 4. 사회적 책무를 수행하는 리더십을 갖춘 의사를 양성한다. 5. 지역 사회에 공헌하는 봉사정신을 갖춘 의사를 양성한다. Purpose : With the changes to the medical environments and to the medical educational systems, we aimed to evaluate the current mission statement of the School of Medicine, Wonkwang University, and to revise it. Methods : To establish the new goal and mission statement, a Special Committee for the Revision of Medical School Mission and advisory group were organized in 2008. This special committee conducted through five steps of action, which are composed of investigation, education, development, surveillance of various opinions, and announcement. Results : For the development of new goal and mission, the revised, final goal and mission statements decided through the five steps of action. The new mission of Wonkwang University School of Medicine was as follows; 1. Doctor who can diagnose and treat easily 2. Ethical and moral doctor who practice Won Buddhism 3. Doctor or Medical Scholar who studies lifelong study 4. Doctor who has leadership to social responsibility 5. Doctor who goes into service to a local community. Conclusion : The authors expect that the new goal and mission of Wonkwang University School of Medicine would be helpful in giving the guideline on the educational process of medical school and will give the information to reform the medical school system according to the rapidly changing educational environment.

Tethered Cord Syndrome; Surgical Indication, Technique and Outcome

Kang, Joon-Ki,Lee, Kwan-Sung,Jeun, Sin-Soo,Kang, Seok-Gu,Lee, Il-Woo,Yoon, Kang-Jun,Ha, Sang-Soo The Korean Neurosurgical Society 2007 Journal of Korean neurosurgical society Vol.42 No.2

Objective : The authors tried to reveal some unique features of lipomeningomyelocele (LMMC), including clinical presentation, factors precipitating onset of symptoms, pathologic entities of LMMC associated with tethered cord syndrome, and surgical outcome in LMMC patients. Methods : Seventy-five patients with LMMC were enrolled in this study. Neuro-imaging and intraoperative findings allowed classification of LMMC into three Types. The patients were divided into two groups by age : A (51 patients), from birth to 3 years, and B (24 patients), from 3 to 24 years. For prevention of retethering of the cord, a mega-dural sac rebuilding procedure was performed in 15 patients. Results : During a mean postoperative follow-up period of 4 years, the surgical outcome was satisfactory in terms of improved pain and motor weakness, but disappointing with reference to the resolution of bowel and bladder dysfunction. Among these 75 patients with LMMC, preoperative deficits were improved after surgery in 29 (39%), remained stable in 28 (37%), changed slightly in 13 (17%), and worsened in 5 (7%). Patients in group A achieved better outcomes than those in group B. Depending on the type of lesion, patients with types I and II LMMC have better outcomes than those with type III LMMC. Finally, retethering of the cord with neurological deterioration occurred in 4 (5.3%) of the 75 patients, but no retethering was found in the 15 patients who were recently treated with a mega-dural sac rebuilding procedure. Conclusion : Our data continue to support the opinion that early diagnosis and optimal surgery are still essential for the treatment of patients with LMMC, since there is a high likelihood of residual neurological functions that can be preserved. Based on our surgical experience of untethering and decompression of lipomas, a mega-dural sac repair is useful to prevent retethering of the cord.

연구원 활동 : 발표논문요약 < 전기공학분야 >

(Yoon Kwan Kang),(Soon Won Jung),(Sang Wook Bae),(Tae Hong Park),(Min Gi Kim),(Gwi Tae Park) 고려대학교 공학기술연구소 1994 공학기술연구소보 Vol.1 No.-

퍼지 클러스터링 알고리즘을 이용한 타이어 접지면 패턴의 분류

강윤관(Yoon-Kwan Kang),정순원(Soon?Won Jung),배상욱(Sang-Wook Bae),김진헌,박귀태(Gwi-Tae Park) 한국지능시스템학회 1995 한국지능시스템학회논문지 Vol.5 No.2

퍼지 클러스터링 알고리즘을 이용한 타이어 접지면 패턴의 분류

강윤관(Yoon-Kwan Kang),정순원(Soon-Won Jung),배상욱(Sang-Wook Bae),박태홍(Tae-Hong Park),김민기(Min-Gi Kim),박귀태(Gwi-Tae Park) 대한전기학회 1993 대한전기학회 학술대회 논문집 Vol.1993 No.7