마이크로 방전에서의 공동음극과 평면음극 방전특성

김종규,김용평 경희대학교 레이저공학연구소 2001 레이저공학 Vol.12 No.-

It is measured and analysed the discharge characteristics of microdischarge at cylinderical micro discharge cell which was designed in range of 400~700 um diameter. Using mica of 500 um thickness as a dielectric and Ni foil of 100um thickness as a electrod, the discharge characteristics of both plane cathode type and hollow cathode type were analysed and compared in the condition of 100-600 torr He gas.

Cyclosporin에 의한 치은증식증의 치험 2례

김종배,박효상,김창환,이용규,최봉주,장학원 啓明大學校 醫科大學 1997 계명의대학술지 Vol.16 No.2

Cyclosporin is a relatively new immunosuppressive agent which has been used to prevent organ transplant rejection, to treat type-I diabetes mellitus and several other autoimmune disorders. It is anticipated that the therapeutic use of cyclosporin will increase progressively in the future to treat numerous other disorders. As its clinical use broadens, it will needed for health professionals to be familiar with the beneficial effects as well as some of the undesirable side effects of cyclosporin therapy. A side effect of this drug in dentistry appears to be pronounced gingival hyperplasia. Cyclosporin induced gingival hyperplasia is indistinguishable from gingival hyperplasia induced by phenytoin and nifedipine in clinical and histopathologic finding. We experienced two cases of gingival hyperplasia secondary to cyclosporin therapy in patients, 48-year old & 28-year old females who received a kidney allograft transplant. Clinical examinations revealed a severely overgrown and inflammed gingiva. Surgical excision of the excess tissue was accomplished under local anesthesia. On follow-up check, gingival hyperplasia in a 48-year old patient whose oral hygiene was very poor showed successive recurrence after three times surgical excision, another patient who could control oral hygiene thoroughly showed good healing. Conclusively, it seems to be very important to control oral hygiene thoroughly to decrease occurrence and recurrence of cyclosporin-induced gingival hyperplasia.

양성 백악아세포종의 치험례

김종배,박효상,최봉주,이용규,남동석,박관수 啓明大學校 醫科大學 1997 계명의대학술지 Vol.16 No.2

Benign cementoblastoma is uncommon odontogenic tumor of the jaw of mesenchymal origin. It is common in male below 25 years of age, commonly occurs in mandibular molar and premolar area. Principal symptom is painless swelling. Radiologically, radiopaque mass is fused with a root or roots of teeth, surrounded, and limited peripherally by a radiolucent halo. Histologically, the tumor is composed of sheets of an osteocementum like material with basophilic reversal line. Because of unlimited growth potential, the usual treatment is complete surgical excision with extraction of the associated teeth. The patient, 16-year old male, was admitted to our hospital with chief complaint of painless swelling on right mandible body area. Surgical excision of lesion and extraction of associated tooth was performed. On follow up check, we obtained good result without any signs of recurrence of the lesion.

시범학교 불소용액양치사업 3년간의 효과평가 연구

김종배,이용규,신승철 啓明大學校 醫科大學 1998 계명의대학술지 Vol.17 No.4

저자등은 학교구강보건사업의 대표적인 사업인 불소용액양치 사업의 효과를 보기 위하여 목천초등학교 고학년 활동 164명을 대상으로 3년간 0.05% 불화나트륨 용액과 10% Xylitol을 주성분으로 제조된 치카치카 용약을 가지고 불소용액양치 사업을 실시하고 학동들의 구강검사르 통하여 우식경험 영구치에 대한 조사를 실시한 구 대조군 아동들의 구강 검사와 비교하여 우예방효과를 산출한 결과 다음과 같은 결론을 얻었다. 1. 사업대상 아동들의 구강검사결과 영구치 우식경함자율은 9세 아동에서 61.2%, 10세 아동에서 62.3%, 11세 아동에서 72.6%로 나타나 대조군 아동에 비해서 우식경함자율에 있어서는 별차이가 없었다. 2. 우식경험영구치율은 9세 아동에서 13.9%, 10세 아동에서는 11.4%, 11세 아동에서는 8.9%로 대조군 아동에서보다 평균 38.3%로 예방 효과를 나타냈다. 3. 우식경험 영구치지수는 9세 아동에서 1.98±0.82, 10세 아동에서 1.79±0.71, 11세 아동에서는 1.92±1.01로 나타나서 대조군 아동과 비교할 때 9세에서는 51.2%로 평균 36.9%의 우식예방효과를 나타내었다. 4. 0.05% 불화나트륨과 10% Xylitol을 함유한 용액으로 실시한 학교 불소용액 양치 사업은 계속 시행할수록 우식예방이 점차 높아지므로 지속적으로 시행되어야 할 것으로 사료되었다. The authors have studied for caries prevention effects of fluoride mouthrinsing program for 3 years. 164 school children were orally examined after mouthrinsing with 0.05% NaF and 10% xylitol solution everyday for 3 years. And compared the results with these of other school children. The obtained results are followings. 1. DMF rate were examined as 61.2% in 9 years old. 62.3% in 10 years old and 72.6% in 11 years old, and no difference with the control group. 2. DMFT rate was 13.9% in 9 years old, 11.4% in 10 years old and 8.9% in 11 years old, so it is estimated that average 38.3% reduction of caries incidence for DMFT rate, compared with the control group. 3. DMFT index was examined as 1.98±0.82 in 9 years old, 1.79±0.71 in 10 years old and 1.92±1.01 in 11 years old. It is estimated that 23.0% of caries reduction effect in 9 years old, 34.7% in 10 years old and 51.2% in 11 years old and average 36.9% reduction effects were calculated. 4. It is recommended that fluoride mouthrinsing program with 0.05% NaF and 10% xylitol solution was effective to prevent the caries incidence for school children.

교정치료에 따른 사춘기 성장 아동의 상기도 폭경과 안면 성장 변화와의 관계 연구

김윤지,복규석,이규홍,황용인,박양호 대한치과교정학회 2009 대한치과교정학회지 Vol.39 No.3

본 연구의 목적은 아동에서 사춘기 성장 동안 기도의 변화가 안면 성장에 미치는 영향을 평가하는 것이었다. 9 - 11세(평균 10.7세)의 교정환자 36명을 대상으로 하여 초진 시(T1)와 치료 종료 시(T2)에 각각 측모두부방사선사진과 수완부 방사선 사진을 촬영하였다. 측모두부방사선사진상의 기도 폭경을 기준으로 하여 대상을 세 그룹으로 나누었다; 폭경이 좁은 그룹(AW-Narrow: 5.2 - 8.6 mm), 중간 그룹(AW-Medium: 8.9 - 11.5 mm), 넓은 그룹(AW-Wide: 11.7 - 16.0 mm). T1과 T2시기에 각 그룹 간의 안면 계측치의 차이를 비교하였으며 T1 - T2 사이의 계측치의 변화량을 각 그룹별로 비교하여 성장을 평가하였다. 각 그룹의 기도 폭경 증가량은 AW-Narrow, AW-Medium, AW-Wide group에서 각각 4.55 mm, 3.84 mm, 1.94 mm였으며 통계적으로 유의한 차이를 보였다. T1시기의 각 그룹 간의 비교에서 AW-Narrow group에서 다른 그룹에 비해 PFH가 유의하게 작은 값을 나타냈다. T1 - T2 사이의 성장 평가에서는 AW-Narrow group에서 다른 그룹에 비해 PFH/AFH, facial axis, ANS (T1 - T2), and Gn (T1 - T2)의 변화가 유의하게 큰 값을 보였다. 이 시기의 안면 성장 기간 동안 기도 폭경이 좁은 그룹에서 기도 폭경 및 안면 성장의 보상성 변화가 일어난 것으로 생각된다. 바람직하지 않은 안면 성장을 예방하기 위한 외과적 기도 처치를 고려할 때 자발적인 개선 가능성을 고려하여 좀 더 신중한 평가가 필요할 것으로 생각된다. Objective: The purpose of this study was to evaluate how airway changes influence facial growth during puberty in Korean children. Methods: Thirty-six patients aged 9 to 11 (mean age: 10.7 years) were selected. Cephalograms and hand-wrist x-rays were taken at pre-treatment (T1) and post-treatment (T2). The sample was divided into narrow (5.2 . 8.6 mm, AW-Narrow), medium (8.9 . 11.5 mm, AW-Medium), and wide (11.7 . 16.0 mm, AW-Wide) groups according to the airway width at T1. Cephalometric measurements at T1, T2 and growth from T1 to T2 were compared between groups. Results: The degree of increase in airway size in each group was 4.55 mm, 3.84 mm and 1.94 mm in the AW-Narrow, AW-Medium, and AW-Wide groups, respectively. Moreover, the differences were statistically significant. The significant smallest posterior facial height was found in the AW-Narrow group at T1. For the growth values from T1 to T2, the AW-Narrow group showed significantly larger values of PFH/AFH, facial axis, ANS (T1 - T2), and Gn (T1 - T2) than the AW-Medium group. Conclusions: The compensational changes in the airway width and facial growth were found in the narrow group. Surgical approach of the airway to prevent unfavorable facial growth in these years of age should be carried out, but with careful deliberation because these problems may be improved naturally.

Al―합금재의 균열닫힘현상에 관한 파괴역학적 연구

최용식,한지원,김규성 成均館大學校 科學技術硏究所 1991 論文集 Vol.42 No.1

In this study, a crack closure behavior of Al-Alloy 5052-H38 was investigated. The fatigue test was performed with 25-ton capacity Instron Dynamic Test System, Model 1332, by the four-point bending test under the constant amplitude load. Stress ratio R was changed from -1.0 to 0.5 and load cycle was 20 Hz at the room temperature. To measure the fatigue crack opening point, the graph of load vs. subrtacted displacement by computer program was obtained from the X-Y plotter. In order to gain the displacement data, a strain gage was attached at the back surface against the notched side. Using the concepts of crack closure and influence of R on crack growth rate, a model for crack growth rate is developed for Al-Alloy 5052-H38. da / dN = C(ΔK_eff)^m = C(1.1 / 1.53 - R ΔK)^m : -1 ≤ R ≤ 0.5 da / dN = C(ΔK_eff)^m = C(ΔK)^m : R ≥ 0.5

제주도에서의 빗물 이온 농도 분석

심상규,강창희,김용표 濟州大學校 基礎科學硏究所 1994 基礎科學硏究 Vol.7 No.1

Precipitation samples were collected at Kosan, Cheju Island over a period of 6 months. An automatic rain sampler was manufactured domestically and installed at Kosan station. All samples were collected on a weekly basis. Samples were analyzed for ??, ??, ??, ??, ??, ??, ??, ??, and pH and specific conductivity. The quality analysis of rain sample data were performed based on ion balance and specific conductivity. The pH of rain samples ranged between 4.6 to 6.6. Bicarbonate ion concentration were included in ion balance and specific conductivity calculations. The sum of cation concentrations were slightly greater than the sum of anion concentrations. Calculated specific conductivity was greater than measured specific conductivity. The most probable explanations for this discrepancy is “an anion too low or anion missing." Two criteria were used to identify outliners. They are 1) the difference between the sum of anion concentrations and cation concentration is more than 50μeq/l and 2) the difference between calculated and measured specific conductivity is more than 25%. Chemical analysis from several samples did not satisfy these quality control criteria. Volume weighted average concentrations were calculated. Dominant free acids in rain samples were ??, ??, ??, ?? ions in order of abundance. Non-seasalt sulfate comprises 76% of total sulfate.

CT-2 시스템의 기지국 구성과 운용형태에 관한 분석

신현식,김용규 여수대학교 1998 論文集 Vol.12 No.2

In this paper, structural methods and types of base-stations in the CT-2 system are discussed, chracteristics of radio propergation and quality of callings through the experiment in the vicinity at Jin-ju city in which have been started recently, are analyzed, and the development trends of the CT-2 serviece are disccused.

다단계 생산공정의 경제적 생산량 결정에 관한 연구

허성관,김홍준,채규용 大邱大學校 科學技術硏究所 1998 科學技術硏究 Vol.5 No.4

This study presents a model which treats the manufacturing cycle time as a function of the lot size in a multi-stage production system. In general, the cost tied up in work-in-process inventory in certain industries can be as high as 60 percent of that of the total. This study presents a model which treats the manufacturing cycle time as a function of the lot size in a multi-stage production system. In general, the cost tied up in work-in-process inventory in certain industries can be as high as 60 percent of that of the total inventory cost. When a recurring production order is manufactured in long runs, marketing has to wait until a long run is competed. This forced waiting time is often caused by the application of the conventional ELQ model, which is widely used in industry. Thus, this study has illustrated the functional relationship between the manufacturing cycle time and the process inventory. Using this functional relationship to determine the magnitude of the work-in-process inventory, a model is developed to calculate the economic production quantity(EPQ). This model is a valid alternative to the conventional production lot size(ELQ) model which only accounts for the finished product inventory.

Burr 분포와 Pearson 분포를 이용한 비정규 공정능력의 평가

허성관,김홍준,채규용 大邱大學校 科學技術硏究所 1998 科學技術硏究 Vol.5 No.4

This paper is an overview and a brief review of the different procedures that are available for fitting theoretical distributions to data. The use of each technique is illustrated by reference to a distribution system which including the Pearson, Johnson and Burr functions. These functions can be used to calculate percent out of specification . Accordingly, in this paper a new methods for estimating a measure of process capability for Non-normally distributed variable data proposed using the percentage nonconforming.