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콘크리트의 급속염화물침투시험에 의한 염화물이온 확산계수 평가에 관한 실험적 연구
김갑수,조봉석,장종호,김재환,김용로,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
Chloride ions are considered to be the major cause of steel corrosion in concrete structures exposed to seashore environments and also permeation of chloride is controlled by chloride diffusion. Therefore, the study on chloride diffusion of concrete have been done so far by many researchers. In this study, several factors such as capacity of voltage, time of an electric current, concentration of NaCl solution, water-cement ratio, and temperature of the solution were examined to grasp what influence they were on the chloride ion diffusion properties using the Rapid Chloride Penetration Test(RCPT) by electrophoresis. Also standing on the basis of the such result application possibility of Rapid Chloride Penetration Test(RCPT) used in this study will be evaluated and the basic data on the durability design for the chloride attack will be suggested.
PVA-ECC를 활용한 Half PC 복합체의 역학적 특성에 관한 실험적 연구
김재환,김영덕,김갑수,조봉석,장종호,김무한 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
ECC represents one particular class of HPFRCC, which are defined by an ultimate strength higher than their first cracking strength and the formation of multiple cracking during the inelastic deformation process. This study is to provide the fundamental data for the development of hybrid construction method such as the half PC(Precast concrete) reinforced by PVA-ECC, the mechanical properties of half PC according to the alteration of properties of PVA-ECC in terms of the type of fiber, Vr, S/M, placing height of PVA-ECC, are experimentally investigated. As the results. it is found that the half PCs of PVA-ECC have very higher mechanical performance in terms of yield load, strain capacity beyond yield point and maximum flexural load than that of mortar. Also, flexural crack in the half PCs of PVA-ECC are not localized at first crack and are growed to many micro crack, especially multiple cracking in specimen of P(12)-30-0.1ㆍ3 occurred.
내시경적 절제로 진단된 폴립 형태의 심재성 낭종성 위염 2예
허종현,조영화,성용완,유재훈,구동영,김갑식,노지훈,문원 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2
Gastritis cystica profunda (GCP) is a disease characterized by hyperplastic and significant extension of cystic dilatation of the gastric mucous glands, which results in a cystic lesion in gastric submucosa. It often occurs on the part of gastroenterostomy, but can be found in the stomach without any previous surgery. GCP has variable gross finding including solitary polyps, diffuse ones, submucosal tumors, and rare giant gastric mucosal fold. It is difficult to tell GCP from a cancerous lesion by gross finding that the disease demands a necessary tissue biopsy, though GCP is commonly showed as a benign in the progress. We report a case of GCP in polypoid types diagnosed by endoscopic polypectomy.
김종성,허정식,이갑철 圓光大學校附設 生活體育硏究所 2001 生活體育硏究 Vol.11 No.-
The purpose of the study on the satisfaction of physical education facilities in the school and participation of sports for all. The subjects were physical education in the school facilities adult visitors. The experimental tool was a questionaire on facilities satisfaction. 1. The school physical education facilities on the use organ according to sex, age, jab and school career significant. 2. The school physical education facilities on the use period and duration time according to age, jab and school career significant but according to sex no significant. 3. The school physical education facilities satisfaction according to age, and jab significant but according to sex, school career no significant. 4. The school physical education facilities satisfaction according to on the use organ significant but according to the use period and duration time.
樹冠通過雨, 樹幹流, 林外雨의 AI, Mn, Ni 濃度의 變化
金佑龍,李總揆,金鍾甲 진주산업대학교 농업기술연구소 1999 農業技術硏究所報 Vol.12 No.-
This study was carried out to investigate on heavy metals by throughfall, stemflow, rainfall at survey area. The concentration in Al by forest type was higher 1.3 times of Pinus thunbergii than Quercus spp. at industrial area, and was high 2.1 times at urban area. Stemflow was higher 2.3 times, 113 times respectively than throughfall, rainfall at industrial and urban area. Rainfall was lowed at industrial and urban area. The concentration in Mn by forest type was higher 2.3 times of Pinus thunbergii than Quercus spp. urban area. Concentration by rain were the highest in stemflow, and order of throughfall, rainfall. Concentration seasonal changes were the highest on December at industrial area, and lowed order on March, June, August, Seasonal changes were not remarkable at urban area. Heavy metals concentration by survey area ordered of Al>Mn>Ni at the industrial area, and those of ordered of Mn>Al>.Ni
Crouching Strart의 Bunch, Medium, Elongated Start와 Bunch Start b의 記錄比較分析
金東建,李鍾甲 忠南大學校體育科學硏究所 1988 體育科學硏究誌 Vol.6 No.1
I come to have the following conclusion about the short-distance starting method : a result of measuring and analysing the record to the sixteen boys' and girls' high school athletes in the start-dash-area which is divided into three sections using four short-distance starting method such as Bunch start, Medium start, Elongated start, and Bunch start b. 1. Bunch start b is the fastest pattern of all short-distance starting methods made by boys' and girls' high school players. 2. The distance from starting line to 20m forward is a factor which has an influence on the record according to the pattern of the short-distance starting methods.
내시경적 밴드 결찰술로 치료한 출혈을 동반한 위 혈관이형성증 1예
김갑식,허종현,성용완,조영화,구동영,유재훈,노지훈,문원 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2
Gastric angiodysplasia is vascular ectasia in mucosa and submucosa of the gastric wall. It is an uncommon cause of upper gastrointesinal hemorrhage that may occur in the stomach or duodenum. There are many kinds of endoscopic treatments, such as argon plasma coagulation, electrocoagulation, heat probe, and submucosal injection of hypertonic saline mixed with epinephrine for gastric angiodysplasia. However, these treatment methods are associated with high rate of rebleeding. In order to avoid the recurrence, endoscopic band ligation has recently been used as an alternative method for endoscopic treatment of gastric angiodysplasia. We encountered a case of gastric angiodysplasia that presented with overt bleeding and anemia, and was successfully treated with endoscopic band ligation.
부하변동이 존재하는 DC 모터의 속도 제어를 위한 외란관측기 설계
김성종,신명준,손영익,김갑일,임승철,강환일 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-
This paper considers a speed control problem of DC motor under load variations. In order to reduce the effect of load variation, a disturbance observer has been designed for the given system. With a cheap encoder there exists considerable measurement noise in the velocity feedback and it should be reflected in designing the disturbance observer. The authors have obtained the nominal transfer function of a DC motor and designed a disturbance observer for the control purpose. With the disturbance observer a digital controller has been implemented using a DSP(TMS32OF2812). Some experiments show the enhanced performance of the control system with the proposed method.
부신 제거 백서에 티타늄 임플랜트 매식후 주위 골형성에 관한 연구
최갑림,김종렬,박봉수,성일용 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.3
The use of dental implants has increased tremendously in recent years and is expected to increase even more in the future. The successful outcome of any implant procedure is surely dependent on interrelationship of the various components of an equation that includes biocompatibility of implant material, macroscopic and microscopic nature of the implant surface, the status of implant bed, surgical technique, undisturbed healing phase and subsequent prosthetic design and long-term loading phase. The purpose of this study was to clarify the effects of adrenalectomy on the osseointegration of pure titanium implants. Seventy rats, 11 weeks of age, were divided into two groups : an adrenalectomized group and a control group. Titanium screw implant(diameter, 2.0mm ; length, 3.5mm) was placed into left tibia of 70 rats, 35 in control group and 35 in the experimental group. The rats were sacrificed at different time interval (1, 2, 3, 4, 6, 8, and 12 weeks after implantation) for histopathologic observation, histomorphometric analysis and immunohistochemistry with fibronectin and CD44 antibody. The results obtained from this study were as follows : 1.Histopathogically, findings, newly formed bone was seen at 3 weeks control group and became lamellar bone at 12 weeks. At 6 weeks, lipocytes were observed in bone marrow space. Thickness of regenerated trabecular bone increased till 6 weeks after then, that decreased gradually. 2.By histomorphometric analysis, marrow bone density and contact ratio of marrow bone to implant decreased significantly from 8 to 12 weeks in experimental group compared to control group and also total bone to implant contact ratio decreased significantly from 4 to 12 weeks in experimental group compared to control group. 3.Fibronectin immunoreactivity was very strong at 3 and 4 weeks control group. And after that reduced gradually. But it was continuously strong from 1 to 12 weeks experimental group. 4.CD44 immunoreactivity was very strong in the newly formed osteoblasts at 3 and 4 weeks control group. But it reacted minimally later. However, it reacted continuously strong from 3 to 12 weeks experimental group. From these results, bone to implant contact ratio decreased gradually from 4 weeks in adrenalectomized group compared to control group. CD44 and fibronectin immunoreactivities were strong at all times in adrenalectomized rats. Therefore, it could be stated that immature bone remained continuously for a long time and not readily proceeded into mature status.