• 대한치과보철학회지
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• 제36권2호
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• pp.258-272
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• 1998

This investigation evaluated patients who received Steri-Oss implants from the Dental Hospital of Chosun University during the period from March 1989 to August 1997. 346 fixtures of 127 patients were included in this study. The results were as follows ; 1.The follow-up period was defined as the period between the surgical placement of the implants and the last follow-up examination. The mean follow-up period was $2.17{\pm}1.21$ years. 2.The period between fixture installation and second surgery was $0.71{\pm}0.44$ years in the maxilla and $0.46{\pm}0.21$ years in the mandible. 3.The number of fixtures which were installed in the upper jaw(112) was less than that in the lower jaw(234) and in the posterior region(260) was more than in the anterior region(86). 4.The length of fixture which was most frequently used was 12 mm and least was 8mm. Screw implants were installed more than cylindrical implants. 3.8mm implant was the most common implans, followed by 4.5mm and 3.25mm. 5.The number of augmentation cases was more than that of non-augmentation cases and the rate of augmentation cases in the maxilla was more than that in the mandible. 6.Implant restorations for partial edentulos patients(94cases) were more than single- tooth implant restorations(33cases) or implant restorations for complete edentulos patients(10cases). 7.Free-standing prostheses for partially edentulous patients were more commom than any other type of connection between implants and natural teeth. 8.Plaque Index($0.95{\pm}0.74$) and Gingival Index($0.31{\pm}0.52$) were very similar around the natural teeth and reflected an acceptable level of plaque and gingivitis control. Mean value for keratinized mucosa index($1.93{\pm}1.20$) remained fairly constant around level 2(1-2 mm keratinized epithelium). 9.Patients were generally satisfied with implant in terms of comfort, function, speech and esthetics. 10.There was not a statistically significant differences in overall survial rate between implants placed in the maxilla (91.5%) and those placed in the mandible (93.8%). Fourteen implants lost before the prosthetic rehabilitation and eleven implants lost following variable periods in function after the prosthetic phase of the treatment. 11.Cause of implant failures was exfoliation or removal of fixture due to non-osseointegration before the prosthetic rehabilitation or due to fracture of fixture, masticatory pain after the prosthetic rehabilitation. 12.The survival rate of Steri-Oss implants using the Kaplan-Meier statistical analysis was 93.8% at 2 year and 86.6% at 5 year, In all cases, implant losses occured predominantly in the healing period. There was a steep decline in the rate of implant loss after the first year. 13.The survival rate of Steri-Oss implants in the anterior region was 94.8% at 2 year and 94.8% at 5 year and that in the posterior region was 92.8% at 2 year and 75.9% at 5 year. In conclusion, this study revealed a number of parameters and guidelines for achieving an optimal success rate in osseointegration.

• Journal of Chest Surgery
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• 제16권2호
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• pp.139-146
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• 1983

Between 1974 and 1982, 31 patients from 7 to 15 years of age have undergone valve replacement for their acuqired cardiac valvular diseases at Seoul National University Hospital. Furteen patients (45.2%) had a definite history of rheumatic fever and only 4 patients (12.9%) had atrial fibrillation on their preoperative electrocardiograms. Characteristically, the valvular lesions were ones of insufficiency with or without associated stenosis in all patients except only one whose mitral valve was tightly stenotic. Thrity-seven valves were replaced in 31 patietns including a case of successful replacement of his failed xenogragt mitral valve : 4 mechanical valves were used in 3 patients and 33 xenograft valves were used in the remaining 28 patients. The size of the valves were not the major problem at the time of opertion because most of the patients had a dilated heart from disease. There were 3 diaths within 30 days of surgery (9.7% operative mortality rate) and 3 late deaths (9.7% late mortality rate) with an overall mortality rate of 19.4%. Twenty-eight early survivors were followed up for a total of 488 patient-months. Thromboembolic complications occurred in 5 patients with 2 deaths: cmbolic rate of 17.9% or the actuarial embolic incidence of 12.29%/patients-year. four xenograft tissue valves in 4 patients had failed during the period from 19 to 41 months of surgery with an overall valve failure rate of xenograft of 14.3% or the actuarial incidence of 9.84% failure/patient-year. One of these 4 patients had required replacement of his failed mitral xenograft valve which had severe calcification and tissue disruption with primary tissue failure rate of 3.6% or the actuarial incidence of 3.13% failure/patient-year. The actuarial survial including the operative morality was 50.0% at 5 years of surgery. /the actuarial incidence free from thromboembolism in bioprosthetic group was 85.4% at 42 months, while it was 33.4% in mechanicial group at 60 months after operation. The actuarial incidence free from overall valve failur of 100.0% until 18 months after surgery was followed by a rapid decrease during the next 2-year period, and it was only 17.8% at the follow-up end of 42 months after surgery. It was suggested that the major advantage of low thrombogenecity with xenograft valve should be balanced against the high incidence of accelerated valve failure when it is used in children whose age is younger than 15 years old. The possible role of recurrent rheumatic attacks to the early failure of xenograft tissue valve was also discussed.

• Journal of Forest and Environmental Science
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• 제16권1호
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• pp.34-41
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• 2000

솔잎혹파리 피해임지의 특성에 따른 수세변동을 구명하였다. 솔잎혹파리 피해도("심", "중", "경")별로 구분하여 수세를 조사한 결과 피해가 심한 지역의 수목은 수세가 현저하게 약화되었으며, 수목의 임분밀도("밀", "중", "소")별로 구분한 경우는 피해도와 관계없이 임분밀도가 낮은 임분에서 수목의 수세가 강하게 나타났다. 수목의 외형적 인자중 수관폭과, 흉고직경이 작은 개체에 비하여 큰 개체의 수세가 모든 임분에서 강하게 나타났다. 각 임분에서 전기저항치와 수관면적과의 관계는 피해도 "심" 임분에서는 수관면적이 $13.4m^2$ "중" 임분에서는 $10.9m^2$, "경" 임분에서는 $7.9m^2$로 피해가 심할수록 수관면적이 넓어야 임목이 생존할 가능성이 높은 전기저항치($15k{\Omega}$ 이하)가 나타나는 것으로 파악되었다.

• The Plant Pathology Journal
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• 제22권4호
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• pp.364-368
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• 2006

Survival of biocontrol agents and their effective colonization of rhizhosphere are the essential components for successful disease suppression. The effects of hydrogel supplement on bacterial survival and disease control were evaluated in pot and in the field. Addition of 2% hydrogel material to potting soil resulted in significant enhancement of colonization of biocontrol agent Serratia plymuthica A21-4 both in soil and rhizosphere of pepper plants. Rhizosphere colonization of S. plymuthica A21-4 retrieved from 40 days old pepper seedlings indicated 100 times higher bacterial population in hydrogel treated soil than in ordinary pot soil. The pepper plants sown in hydrogelated potting soil showed higher seed germination rate and the better growth of pepper plant than those in ordinary commercial pot soil. Although the suppression of Phytophthora capsid density in the potting soil by treatment of biocontrol agent A21-4 was not significantly different between in hydrogelated soil and ordinary potting soil, the suppression of Phytophthora blight between two treatments was significantly different. A21-4 treatment in hydrogelated potting soil was completely disease-free while same treatment in ordinary potting soil revealed 36% disease incidence. Our field study under natural disease occurrence also showed significantly less disease incidence(12.3%) in the A21-4 treatment in the hydrogelated soil compared to other treatments. Yield promotion of pepper by the A21-4 treatment in the hydrogelated potting soil was also recognized. Our results indicated that hydrogel amendment with biocontrol agent in pot soil would be a good alternative to protect pepper seedlings and increase plant yield.

• 한국초지조사료학회지
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• 제16권1호
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• pp.1-8
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• 1996

The objective of this study is to obtain the basic data for investigating the effects of organic reserves on winter survial or regrowth yield. Forage rape (Brussicu napus L.) was sown at 10 day> interval from Sep. I to Nov. 1. Field-grown palnts were sampled on the before wintering (Dec. 4) and on the wintering period (Jan. 16) to analyze the nitrogen and non-structural cahohydrate reserves. The rate of winter survival and regrowth yield were also measured in the spring of next year. On the before wintering, the dry matter yields from the plots sown on Sep. 1, Sep.11 and Sep. 21 were 860, 596 and 260 kg/lOa, respectively. No. harvest was canied out on the plots sown after Oct. 1 because the growth state was not enough to cut. Both of nitrogen and starch contents per plant significantly increased as the seeding date was later. On the wintering period, the contents of nitrogen reserves in roots were 176.8. 120.1, 71.7, 84.0, 72.1, 45.3 and 33.3 mg/plant, those of starch reserves were 199.0. 55.8, 21.8, 92.6, 86.5, 36.4 and 29.0 mglplant, resepctively, in the plots sown on Sep. 1, Sep. 11, Sep. 21, Oct. I, Oct. 11, Oct. 21 and Nov. 1. The rates of winter survival were 40, 36, 33, 85, 87, 59 and 49% and regrowth yields were 161, 86, 65, 520, 451, 121 and 33 kgD.M/lOa, respectively, in each plots. 'Ihese results clearly showed that seeding date has a close influence on the level of organic reserves and forage yield, and that the possibility of continuous utilization on the before and alter wintering is extremely limited by seeding date.

• 한국수정란이식학회지
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• 제13권1호
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• pp.1-9
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• 1998

In order to improve the cryopreservation by vitrification or slow freezing of nuclear transplant rabbit embryos, the effects of factors affecting embryo cryopreservation such as cryoprotectants, equilibration, cooling rate and post-thaw dilution on post-thaw survial and development were determined using intact embryos of morular stage. And the post-thaw development of nuclear transplanted embryos cryopreserved under the optimal conditions examined was compared between vitrification and slow freezing. The cryoprotectant solution used was ethyleneglycol-ficoll-sucrose (EFS) or ethyleneglycol-poly-vinylpyrrolidone-galactose- I (EPG- I ) for vitrification, and EPG- II for slow freezing. To examine the viability of frozen-thawed embryos, the nuclear transplanted embryos were co-cultured in TCM-199 plus 10% FBS with bovine oviduct epithelial cells(BOEC) for 24 hrs and the intact morulae were co-cultured with BOEC for 5 days and 3 days to hatching blastocyst stage in 39 ˚C 5% $CO_2$ incubator. The results obtained were as follows: Following vitrification with EFS, the post-thaw development of rabbit morulae to hatching blastocyst was significantly(P<0.05) higher in compacted stage(82.4%) than in early morular stage(60.0%). The post-thaw development of compacted morulae to hatching blastocyst was similarly high in vitrification with EFS(82.4%), EPG- I (85.0%) and in slow freezing with EPG- II (83.3%). Following vitrification with EPG- I, the post-thaw development of intact rabbit morulae to hatching blastocyst was similar as 78.0% and 85.0% in 1-step and 2-step post-thaw dilution, respectively. The post-thaw development of nuclear transplanted rabbit embryos of compacted morulae stage to hatching blastocyst was similarly 43.6% and 40.0% in vitrification with EPG- Iand slow freezing with EPG- II, respectively. These results indicated that the rabbit nuclear transplant and intact embryos of morulae stage could be well cryopreserved with either vitrification or slow freezing procedure.

• Radiation Oncology Journal
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• 제13권4호
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• pp.303-309
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• 1995

목적 : 근치적 방사선치료를 받은 비소세포 폐암 환자의 생존율과 생존율에 영향을 미치는 예후인자를 알아보고, 방사선조사량을 6500 cGy로 증가시키는 것이 국소관해율과 생존율에 영향을 미치는지 여부를 알아보기 위하여 본 연구를 계획하였다. 방법 : 조직학적으로 증명된 비소세포 폐암으로 진단 받고, 원격전이는 없으나 수술 불가능한 환자를 대상으로 근치적 방사선치료를 시행하였다. A군은 하루에 180 cGy에서 200 cGy 씩 조사하여 6000 cGy 이하를 조사하였고, B군은 같은 방법으로 6500 cGy까지 조사하였다. 결과 : 98명 전체 환자의 1년, 2년, 3년 생존율은 각각 54.0%, 26.6%, 16.4%였으며 정중앙 생존기간은 13개월이었다. 예후인자중 통계학적으로 의미있는 것은 병기와 N-병기였으며 방사선조사량은 의미가 없었다. 국소관해율과 생존율에 있어서도 A군과 B군 사이에 차이는 없었다. 결론 : 비소세포 폐암의 치료 성적을 올리기 위해서 단순히 방사선조사량을 6500 cGy까지 올리는 것은 의미가 없다 하겠고, 더 많은 방사선량을 조사할 수 있도록 다분할 방사선치료를 시행하거나 혹은 동시 화학-방사선요법등 다른 치료방법을 고려해야 할 것으로 사료된다.

• 대한두경부종양학회지
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• 제7권2호
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• pp.129-136
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• 1991

This is a clinical, retrospective review of 66 cases of the Adenoid cystic carcinoma who were treated at the Department of Surgery, Presbyterian Medical Center, Chonju during the past 20 years from January, 1971 to December, 1990. The results were obtained as follows; 1) The most common malignant tumor in the minor salivary gland was adenoid cystic carcinoma and it's incidence was 57.6% (38 cases). 2) The most common site of adenoid cystic carcinoma in the major salivary gland was parotid gland with the incidence of 22.7% (15 cases). 3) The peak age of patients with adenoid cystic carcinoma was 5th decade(30.3%) and others' peak age except adenoid cystic carcinoma was 6th decade(35.9%). 4) The duration of symptoms of adenoid cystic carcinoma patient was less than one year in the minor salivary gland, comprising 21 cases(55.3 %) and more than one year in 18 cases(64.9 %) of the major salivary gland carcinoma. 5) According to histologic grades of 66 cases of adenoid cystic carcinoma, Grade I was 15 cases and Grade II 19 cases, Grade III 5 cases. Other 27 cases were undetermined. 6) The incidence of cervical lymphnode metastasis of 39 cases of adenoid cystic carcinoma classified into histologic grades was 0% in Grade I, 10.5% in Grade II and 20% in Grade III. 7) The incidence of nerve invasion confirmed histologically was 20% in Grade I, 63.2% in Grade II and 100% in Grade III. It was significant(p<0.01). 8) The local recurrence rate was 26.7% in Grade I, 47.4% in Grade II and 60% in Grade III. The lung was the commonest site for distant metastasis comprising 14 cases among 19 cases in which distant spread occurred. 9) 5 year determinate disease-free survival rate according to the histologic grade was 57.1% in Grade I, 27.3% in Grade II and 25.0% in Grade III. 10) The determinate 5-year survial rate of adenoid cystic carcinoma was 71.4% in the only curative surgery group, 70.6% in the combined treatment group of surgery and postoperative irradiation, 66.7% in the combined treatment group of surgery with postoperative irradiation and chemotherapy, and 33.3 % in the non-curative treatment group. 11) The average size of tumor was 3.6cm in Grade I, 4.8cm in Grade II and 4.5cm in Grade III.

• 한국양식학회지
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• 제11권4호
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• pp.565-572
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• 1998

붉바리의 종묘생산시 낮은 생존률은 다른 해산어류보다 자어기의 입크기가 현저히 작은 것과 관련이 큰 것으로 생각된다. 본 실험에서는 붉바리 자어의 생존률과 관련한 자어기 동안의 먹이생물 크기, 수온 및 먹이의 밀도에 따른 자어의 생존률등을 조사하였고, 더불어 자치어 사육기간 중의 성장관계 등을 조사하였다. Tetraselmis tetrathele, 해산 Chlorella 및 Nannochloris oculata를 먹이로하였을 때 태국산 S형 rotifer의 크기는 먹이의 크기가 작을수록 rotifer의 크기도 작아지는 것으로 나타났다. 수온에 따른 S형 rotifer의 크기는 수온이 높을수록 rotifer의 크기도 작아지는 경향을 보였다. 수온에 따른 자어의 생존률은 $29^{\circ}C$까지는 수온이 높을수록 생존률도 높은 것으로 나타났다. 먹이의 밀도에 따른 자어의 생존률은 rotifer의 밀도가 ml당 15~20개체에서 가장 높은 것으로 나타났다. S형 rotifer, S형 rotifer 중 작은 개체, L형 rotifer, L형 rotifer 중 작은 개체를 각각 먹이로 하여 자어를 사육한 결과, S형 rotifer 및 S형 rotifer 중 작은 개체를 공급한 경우는 생존이 가능하였으나, L형 rotifer 및 L형 rotifer 중 작은 개체를 공급한 경우는 부화후 1주일 이내에 모두 사망한 것으로 조사되었다. S형 rotifer 중 작은 개체만을 택하여 자어에게 공급한 경우는 작은 개체의 rotifer가 자어 사육수조 내에서 성장되었기 때문에 자어가 이것을 효과적으로 섭취하지 못했고, 따라서 S형 rotifer만을 공급한 자어의 생존률과 큰 차이가 없었던 것으로 풀이되었다. 6톤 수조에서 부화자어의 수용밀도를 40,000마리로 하여 53일간 사육한 결과, 부화 후 10일까지의 자어 생존률은 6.3%, 총 사육기간 중의 자치어 생존률은 0.2%로 나타났다. 부화후 53일째 치어의 평균 전장은 29.5mm였다.

• 한국잠사곤충학회지
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• 제29권2호
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• pp.44-50
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• 1987

고도(37$^{\circ}C$)처리에 의한 바이러스성 건연병의 발병억제 효과를 검정한 결과는 다음과 같다. 1. 고온처리 시기는 5령기잠 또는 4.5령기잠이 가장 알맞았다. 2. 고온처리 기간은 12-24시간이 적절했다. 3. 2령기잠에 바이러스를 접종하고 5령기잠 또는 4,5령기잠에 각각 12 및 24시간 고온처리 했을 때, 생존율은 고온 무처리 대비 지수로 33.8-39.5%가 높았고, 1만두 수견량 24.2-32.0%은 높았다. 4. 3령기잠에 바이러스를 접종하고 위와 같은 방법으로 고온처리 했을 때, 생존율은 무처리 대비 지수로 53.6-70.0%, 1만두 수견량은 45.8-54.2%가 높았다. 5. 4령기잠에 바이러스 접종 후 5령기잠에 12 및 24시간 고온처리 했을 때는 무처리 대비 지수로 생존율은 49.7-68.9%, 1만기 수견량은 44.3-69.0%이 높았다.