중합방법에 따른 치면열구전색재의 물리적 성질에 관한 연구

국승호,성진효,김동기 대한구강보건학회 1996 大韓口腔保健學會誌 Vol.20 No.2

In order to progress the physical property of sealants for enhancing caries preventive effectiveness, the author used the argon laser in the range of visible light for curing sealants and analyzed the difference of the physical property between visible light curing sealants and argon laser curing sealants. The obtained results were as follows; 1. There was statically significant difference in compressive strength between laser curing sealants and visible light curing sealants(P<0.05). 2. There was statically significant difference in shear strength between laser curing sealants and visible light curing sealants in case of Teethmate-A and Superlux seal(P<0.05). 3. There was statically significant difference in surface microhardness between laser curing sealants and visible light curing sealants expect 3M Concise^(TM)(P<0.05). 4. The Physical property was more progressed by laser curing than visible light curing.

가압형 정삼투 시 압력에 따른 정삼투막의 Structure Parameter 변화양상 예측

국승호,김성조,이진우,황문현,김인수 한국막학회 2016 멤브레인 Vol.26 No.3

Pressure-assisted forward osmosis (PAFO) process has recently been under spotlight for its potential to improve forward osmosis (FO) process performance by applying low hydraulic pressure on the feed side. Structure parameter, one of the governing factors in estimating water flux and solute flux across FO membranes in the solution-diffusion model (S-D model), determines solute resistivity in FO and PAFO processes. This study aims to estimate the trend of structure parameter change with respect to varying additional hydraulic pressure condition in PAFO. 최근 정삼투(FO) 공정의 성능향상을 위해 유입수에 낮은 수압을 가하는 가압형 정삼투(PAFO) 공정이 관심을 받고 있다. Structure parameter는 FO 및 PAFO 공정 운전시 유도용질의 확산 저항성(Solute resistivity)을 결정하며, 이는Solution-diffusion model (S-D model)을 통한 수투과 및 염투과 성능 예측을 지배하는 인자 중에 하나이다. 본 연구는 S-D model을 이용하여 가압형 정삼투시 유입수 측에 가해지는 압력에 따른 Structure parameter 변화 양상을 예측하고자 하였다.

자동차 가상생산 기술 적용(VII) : 프레스 디지털 가상공장의 구축과 활용

국승호,이상석,소순일,노상도,김희선,심경보,김주열,Kuk, Seung-Ho,Lee, Sang-Seok,So, Soon-Il,Noh, Sang-Do,Kim, H.S.,Shim, K.B.,Kim, J.Y. 대한산업공학회 2008 산업공학 Vol.21 No.3

Digital Virtual Manufacturing is a technology to facilitate effective product developments and agile productions by digital model representing the physical and logical schema and the behavior of real manufacturing system, and it includes product, resources, processes and plant. For successful applications of this technology, a digital virtual factory as a well-designed and integrated environment is essential. In this research, we constructed a sophisticated digital virtual factory of a Korean automotive company's press shop. For efficient constructions of a digital virtual factory useful to kinematic simulations and visualizations, we analyzed entire business process and detailed activities of press engineering. Also, we evaluated geometries, structures, characteristics and motions of a plant and machines in press shop. The geometric model and related data of a virtual press shop are built and managed by a modeling standard defined in this paper. The virtual manufacturing simulation of press machines is conducted to evaluate kinematic motions, cycle time and locations of components using geometric models and related data. It's for interference checks and productivity improvements. We expect that this virtual press shop helps us to achieve great savings in time and cost in many manufacturing preparation activities in the new car development process of automotive companies.

자동차 가상생산 기술 적용 7 : 프레스 디지털 가상공장의 구축과 활용

국승호,이상석,소순일,노상도,김희선,심경보,김주열 대한산업공학회 2008 산업공학 Vol.21 No.3

Digital Virtual Manufacturing is a technology to facilitate effective product developments and agile productions by digital model representing the physical and logical schema and the behavior of real manufacturing system, and it includes product, resources, processes and plant. For successful applications of this technology, a digital virtual factory as a well-designed and integrated environment is essential. In this research, we constructed a sophisticated digital virtual factory of a Korean automotive company's press shop. For efficient constructions of a digital virtual factory useful to kinematic simulations and visualizations, we analyzed entire business process and detailed activities of press engineering. Also, we evaluated geometries, structures, characteristics and motions of a plant and machines in press shop. The geometric model and related data of a virtual press shop are built and managed by a modeling standard defined in this paper. The virtual manufacturing simulation of press machines is conducted to evaluate kinematic motions, cycle time and locations of components using geometric models and related data. It's for interference checks and productivity improvements. We expect that this virtual press shop helps us to achieve great savings in time and cost in many manufacturing preparation activities in the new car development process of automotive companies.

초등학교 아동 구치의 치면열구전색 효과

국승호,정학균,김동기 朝鮮大學校 口腔生物學硏究所 1998 Oral Biology Research (Oral Biol Res) Vol.22 No.2

Dental caries and periodontal disease are the major oral diseases. Especially, dental caries is the main cause of tooth loss in children. DMFT index in 12-year-old children in Korea has been increased such as 0.6 in 1972, 2.5 in 1979 and 3.1 in 1990. Approximately 50% or more of all the caries lesions in the mouth occur on the occlusal surfaces of the posterior teeth. Many children suffer from the dental caries. To relief the pain from the dental caries and to make their school-life enjoyable, we should prevent the dental caries, especially occlusal surface caries in children. The method available to prevent occlusal surface caries is sealants which occlude the deep pits and fissures of teeth and isolate the occlusal surfaces from the oral environments. As long as the sealants are retained, no more dental caries occur on occlusal surfaces. But if they are not retained fully or partially, it has a possibility that dental caries occur on occlusal surfaces. The purpose of this study is to evaluate the amounts of carious lesions developed by the retention type of the sealants and then to decide whether the lost sealants would be replaced or not, and the last, to evaluate the cost-benefit effect of the pit and fissure sealants. We will select 466 subjects who are from first to third grade children and have 1st molar in right and left side which is sound and has the deep pit and fissure. One side of 1st molar will be sealed(experimental goup), the other will be not sealed(control group). The results obtained as follows: 1. It took 5 minutes and 21 seconds in average to sealing on 1st molars. 2. The complete retention rate for light curing was 99.2% which was higher than for self curing. 3. In case of light curing, the complete retention rate was a little highly dried of cool air than dried of warm air. 4. It needs to progress and develop the incremental oral health care system as a way of national policy for child oral health.

가압형 정삼투시 압력조건에 따른 Structure Parameter의 변화 예측

국승호,김성조,이진우,김승원,김인수 대한환경공학회 2015 대한환경공학회 학술발표논문집 Vol.2015 No.10

중합방법에 따른 치면열구전색재의 물리적 성질에 관한 연구

국승호,성진효,김동기 朝鮮大學校 口腔生物學硏究所 1995 口腔生物學硏究 Vol.19 No.2

중합효소 연쇄반응법을 이용한 Fusobacterium nucleatum ATCC 25586 의 동정

국승호,성진효,국중기,김동기 대한구강보건학회 1999 大韓口腔保健學會誌 Vol.23 No.4

The purpose of the present study was to develop DNA probe and polymerase chain reaction (PCR) primer for rapid and accurate detection and identification of Fusobacterium nucleatum ATCC 25586. This study procedure includes (1) whole-genomic DNA extraction of Fusobacterium nucleatum ATCC 25586, (2) construction of the genomic DNA library, (3) screening of restriction fragment of genomic DNA, (4) identification of species-specific DNA probe by Southern blot hybridization, (5) determination of nucleotide sequences of species-specific DNA probe, (6) design of PCR primer, (7) PCR. Three restriction fragments of Fusobacterium nucleatum ATCC 25586 genomic DNA digested with the endonuclease Xba I were obtained. The probe F25 was shown to be hybridized with Fusobacterium nucleatum ATCC 25586 strongly. The nucleotide sequences of probe F25 (830 base pairs) was obtained by dideoxy-chain termination method. From that results, the specific primers (GSH1 & GSH2) to Fusobacterium nucleatum ATCC 25586 were designed. It has been found that primer GSH1 and GSH2 could detect Fusobacterium nucleatum ATCC 25586 using PCR. These data indicated that these DNA probe and PCR primers could be used to detect and identify the Fursobacterium nucleatum ATCC 25586.

중합방법에 따른 치면열구전색재의 물성에 관한 연구

국승호,김동기 대한구강보건학회 1995 大韓口腔保健學會誌 Vol.19 No.3

수압과 삼투압의 등압조건시 정삼투막 투과성능 평가

국승호,김인수 한국막학회 2016 한국막학회 총회 및 학술발표회 Vol.2016 No.05

정삼투막 성능 예측에는 Solution-diffusion model이 지배적으로 활용되어 왔으나, 기존 연구에서 수압과 삼투압이 동시에 작용하는 가압형 정삼투 공정에 대한 예측정확도가 감소하며, 이를 위해 수압이 투과성능에 미치는 영향을 convection과 diffusion을 동시에 고려해야한다는 연구결과가 보고되었다. 본 연구에서는 CTA-ES 및 PA-TFC 정삼투막을 이용하였으며, 활성층 측에는 NaCl 용액을, 지지층 측에는 증류수를 주입하고, 활성층 측에 삼투압과 동일한 수압을 가하여 농도변화에 따른 수투과도 및 염투과도의 변화양상을 평가하였다.