The relationship study of service experience factors on customer satisfaction and repurchasing intention in professional soccer league

김종환,홍재승 한국스포츠산업경영학회 2003 한국스포츠산업경영학회지 Vol.8 No.2

프로축구리그관중의 만족도와 재구매의도의 상관요인분석에 관한 연구김종환 (중앙대학교), 홍재승 (서울대학교)

New Aggregation Algorithm for Tandem queue with Finite Buffers

김종환,Hur, Sung Kwan,徐承祿 大邱大學校附設 基礎科學硏究所 1991 基礎科學硏究 Vol.8 No.-

We consider a two-stage fmite tandem queueing system with Poisson arrivals and negative exponential service times. The customer who has completed his service at the first station has to go directlty to the second station. If the queue of the second station is full at the moment of the service completion of the customer at the first station, then the customer receives, another service at the first station. This is repeated until the customer completes a service at the first station at the moment that the second station is not fulL The problem of calculating the steady-state probabilities of this queueing system by the ordinary balance equations is time consuming. We develop an efficient algorithm to obtain the steady-state probabilities that utilize the two-way state aggregation techniques.

중·고등학교 야구선수의 코치 리더십 선호도에 관한 연구

김종환,고경석 公州大學校스포츠科學硏究所 2000 스포츠科學硏究所論文集 Vol.- No.14

This study was tried to learn the preference in coach leadership for middle and high school baseball players and the differences by their abilities and their positions. Therefore, this was asked to 220 baseball players from 5 middle schools and 3 high schools. And we made an analysis of 215 players excluding 1 of the 126 middle school and 4 of the 94 high school. To make an analysis on the collected data we made an average and a standard on the preference on the coach's activity and executed a t-test to learn the differences on their preference. After the analysis, the results of this study is the following. First, there wasn't a clear difference in the preference of coaching ability in middle school and high school baseball players, but high school players preferred the coaching ability more than middle school players. Second, in ability rate back-up players preferred social support behavior and autocratic behavior more than starting members. Third, in positions infielders preferred democratic behavior and social support behavior more than outfielders.

바이오에탄올 회수를 위한 추출증류 공정모사

김종환,박상진 한국공업화학회 2007 한국공업화학회 연구논문 초록집 Vol.2007 No.1

High-Speed Camera Analysis for Nanoparticles Produced by using a Pulsed Wire-Discharge Method

김종환,김대성,류봉기,Hisayuki Suematsu,Kenta Tanaka 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.1

We investigated the performance of a high-speed camera and the nanoparticle size distribution to quantify the mechanism of synthesized nanoparticle formation in a pulsed wire discharge (PWD) experiment. The Sn-58Bi alloy wire was 0.5 mm in diameter and 32 mm long; it was prepared in the PWD chamber, and the evaporation explosion process was observed by using a high-speed camera. In order to vary the conditions and analyze the mechanisms of nanoparticle synthesis in the PWD, we changed the pressure of the N2 gas in the chamber from 25 to 75 kPa. To synthesize nanoparticles on a nano-scale, we fixed the charging voltage at 6 kV, and the high-speed camera captured pictures at 22,500 frames per second. The experimental results show that the electronic explosion process at different N2 gas pressures can be characterized by using the explosion’s duration and the explosion’s intensity. The experiments at the lowest pressure exhibited a longer explosion duration and a greater intensity. Also, at low pressure, very small nanoparticles with a good dispersion were produced.

체제의 불안정성을 반영하는 동시에 키우고 있다

김종환 책갈피 2017 마르크스21 Vol.- No.20

産後憂鬱症에 關한 東西醫學的 考察

金鍾桓 대한한의학회 부인과학회 1997 大韓韓方婦人科學會誌 Vol.10 No.1

錦江産 Zacco Platypus 에 對한 Metagonimus 吸蟲 被囊幼蟲에 關한 調査硏究

金鍾煥,宋柱福 충남대학교 자연과학연구소 1980 學術硏究誌 Vol.7 No.2

A. Zacco platypus was caught from three localities in Gum River and the metacercariae of Metagoniums yokogawai were isolated from the fish. The rate of metacercarial infection showed 70.4 per cent among 54 fish examined. The prevalence rates of the fish were 93.3~100 per cent at the both areas Jeogok-Ri and Sintanjin, otherwise the rate was only 21.1 per cent at Dae-hak-Ri. The larger fish and the female had the higher rates of the metacercarial infections than the smaller one and the male. B. The distribution rates of metacercaria in the fish was observed the following order. on the scale: 77.1%, in the muscle and fin:18.7%, the head part:2.9%, and the intestine and visceral organs. 1.3%, respectively. C. The shape of metacercaria was oval or spherical form, and 150.3μ in length, 1404μ in width and 2.0μ in the thickness of the cyst wall D. Tne adult worms which were experimentally infected to the mouse host were observed The morphological character of worms were the eccentric position of the ventral sucker, which was located about half way between the anterior and posterior ends of the body but to the right of the midline

가토 경골의 골 결손부에 차폐막과 탈회동결건조골이 골 재생 과정에 미치는 영향

김종환,이희철 인제대학교 1999 仁濟醫學 Vol.20 No.1S

골 유도 재생술은 치과학에서 많은 관심을 가져온 분야로써 특히 구강외과 영역이나 치주과 영역에서 임플란트의 사용과 더불어 결손된 골을 재생시키기 위한 많은 연구가 진행되어 왔다. 최근에는 차폐막을 이용한 유도골 조직 재생술이나 차폐막과골 이식을 동시에 시행하는 방법 등으로 원하는 직경과 길이의 임플란트를 매식한 뒤조직 유도에 의한 골 결손을 해결하기위한 연구가 진행되고 있다. 이에 본 연구는 골 결손이 있을 때 차페막과 탈회동결건조골의 골 재생에 대한 효과를 알아보고자 생후 1년 정도 동일 조건하에서 사욱된 제충2.0∼2.5kg정도의 가토 18마리를 대상으로 가토의 경골 부위에 인위적으로 골 결손 부위를 만들고, 결손 부위에 차폐 막만을 사용한 군(제1 실험군), 탈회동결건조골만을 사용한 군(제2 실험군), 차폐막과 탈회동결건조골을 함께 사용한 군(제3 실험군)으로 구분하였다. 수술 4주, 6주 및 8주 경과 후 실험 동물을 희생시켜 공골을 제거한 후 결손부위로부터 채취된 조직으로 통상적인 H&E염색을 실시하여 실험군별, 시기별로 골 조직 재상과정을 관찰하여 다음의 결과를 얻었다. 1.골결손부의 신생골 형성은 모든 실험군에서 술후 4주에 관찰되었으며, 제3 실험군에서는 4주에 일부 층판골 형성이 나타나기 시작하였다. 2.신생골이 층판골로 성숙되어 대치되는 소견이 제3 실험군에서 4주에 나타나기 시작하였고, 6주에서 제2 실험군에서도 관찰되나 제3 실험군 비해 덜 현저하였다. 8주가 되면 두 군 모두 층판골로 대치되었다. 3.골결손부 이식재 주변의 염증 반응이 4주에서 제2 실험군에서 제3 실험군보다 약간 많았으며 반면 이식재의 흡수는 제3 실험군에서는 나타나기 시작하였다. 6주에서 제3 실험군에서 제2 실험군에 비해 염증 반응이 약간 경미하고 이식재의 흡수는 조금 현저하였으며. 8주에서 제3 실험군은 거의 이식재가 대부분 흡수되고 염증이 거의 없었으나, 제2 실험군은 흡수되지 않은 이식재가 관찰되고 염증도 나타났다. 이상의 결과로 신생골 형성에 있어서는 차폐막 만을 사용하거나 탈회동결건조골만을 이용한 경우보다 탈회동결건조골과 차폐막을 함께 사용한 경우에 신생골 형성 및 층판골로의 성숙이 빨리 나타나고 현저하며, 이식재로 인한 염증반응이 약간 경미하고 이식재의 흡수가 빨라 골 조직의 재생을 유도하는데 효과적인 것으로 나타났다. Bone regeneration following bony defect becomes an important issue in dental surgery associated with incerased use of implant. Barrier membrane or bone graft has been effective for induction of bone regeneration. The aom of lthis study is to investigate the effectiveness in bone regeneration of barrier menbrace or bone graft applied on bony defects, Eighteen rabbits weighing about 2.0∼2.5kg were selected. Artifical bony defect, 5×5×3mm in size, was made on the crest of tibia, and barrier menbrane(Gore-tex)was applied on the defect in Group 1, demineralized freeze dried bone(DFDB) only in Group II and barrier membrane with DFDB in Group III. Experimental rabbits were sacrificed at 4.6 and 8 weeks after surgery, and tibia was removed. Light microscopic examintion of H&E and section was performed to evaluate the histologic changes. The results were as follows : 1.New bone formation was observed at postpoeratibe 4 weeks in all groups, and lamellar bone changes. The results were as follows : 2.At postoperative 6 weeks. lamellar bone formation was noted in Group II and III but was slightly more conspicuous in Group III. 3.Inflammatory reaction around bone fragment of DFDB was a little more and resorption of bone fragments was slightlu less in Group II than in Group III at postoperative 4 weeks, and resorption of bony fragment was more and inflammatory reactio is less in Group III than Group II at postoperative 6 weeks. At 8 weeks, there was meither residual bony tissue mor inflammatory reaction in Group in, but residual bony fragment with inflammatory reaction was shill demonstrated in Group II. In summary, bone regeneration are more conspicuous and rapid in DFDB with Gore-tex group than in barrier membrane(Gore-tex)or DFDB only group, and inflammatory reaction is less, and resorption is more rapid and dffective in DFDB with Gore-tex group.

농약다성분 분석표준물질의 개발 및 평가

김종환,최성길,이승민,홍수명,서종수 한국농약과학회 2018 한국농약과학회 학술발표대회 논문집 Vol.2018 No.4