• Restorative Dentistry and Endodontics
• /
• v.11 no.1
• /
• pp.7-10
• /
• 1985

Coccal form of microorganism (staphylococcus) isolated from infected root canal was inoculated on the thioglycolate agar and paper discs (5mm in diameter) immersed with 0.1ml of 10% Formaldehyde, Thymol, Eugenol Phenol (90%) and 5% Silver nitrate were placed on the media. The thioglycolate plate was incubated at $37^{\circ}C$ for 48 hours. Inhibition zone was measured as follow: The greatest value was 3.9mm at Formaldehyde, next followed Thymol 3.6mm, Eugenol 3.5mm and Phenol 3.4mm. The least value, 3.0mm was found at Silver nitrate.

• Journal of the Korean Operations Research and Management Science Society
• /
• v.30 no.1
• /
• pp.17-26
• /
• 2005

There is the uncertainty of demands at each retailer in the supply chain. To satisfy customers' demand, retailer must have enough inventory. Nevertheless, stockout is occurred for some retailers. A lateral transshipment policy can be effectively used to deal with stockout. The new lateral transshipment policy, referred to service level adjustment (SLA), is suggested. The difference between SLA and previous policies is the integration of an emergency lateral 'transshipment with a preventive lateral transshipment to efficiently respond customers' demand in the proposed policy. Additionally, the service level to decide the quantity of products is considered. Simulation experiment is executed to treat stochastic factors in the two-echelon supply chain. The proposed policy can reduce total cost and is more effective to the change of demand, penalty cost, and ordering cost than the currently used policies.

• The Journal of the Korean dental association
• /
• v.11 no.3
• /
• pp.185-189
• /
• 1973

Dental amalgam in the clinic practice of dentistry is one of the most important materials. Mercury, one of the component of this alloy, is emitted in the form of vapor after filling as long as 5 days Silver particles penetrate into the dentine deeply along the tubles underneath cavity floor. To determine the permeability of mercury in the teeth following experiments were performed. Class 5 cavities total 40 from 10 dogs were prepared on upper and lower canines and amalgam alloys which contain about 10uCi of radioactive mercury were inserted. The animals were sacrificed 7 days after the experiments and the teeth were decalcified, sectioned and autoradiographed by means of emulsion and stained by H & E. Following are the results obtained from this experiments. 1. Blackened silver grains were found along the dentinal tubules underneath the cavity floor. Beyond the border of dentine and pulp chamber grains were seen in odontoblastic layer (Fig. 1, 2, 3, 4) 2. Underneath the odontoblastic layer, the pulp tissue showed almost normal appearance except slight dilatation of blood vessel.

• The Journal of the Korean dental association
• /
• v.16 no.3 s.106
• /
• pp.223-234
• /
• 1978

성장기에 있어서 치아우식병발생은 특히 국민학교아동에게서 크게 나타나며 손쉬운 대책으로 발전된 것이' 치과치료사(dental therapist)혹은 치과간호원(dental nurse)제도이다. 이 제도는 약 50년전 Newzealand에서 시작되어 국민학교아동에 대한 간단한 치료와 구강위생교육급예방에 대한 제도를 주임무로 삼고 각학교에 배치되었다. 최근 이 제도는 대양주각국에 도입되어 유사업무에 임하고 있다. 한국에는 각종보조원학교가 있으나 이 제도와는 업무분야가 다르고 국민학교아동에 대한 전담제도가 확립되어 있지 않기에 '뉴-사우스웨일즈주'에 있는 학교를 예로 들어 학교의 행선적구조, 인력, 교과내용 훈련방법, 실사회활동, 급 본인들의 직업적 만족도등을 조사연구하였음.

• Proceedings of the Optical Society of Korea Conference
• /
• 2005.07a
• /
• pp.204-205
• /
• 2005

Studies on display has been requested some major changes due to the high growth of the handheld terminal market. Therefore, the self emitting OLED(Organic Light Emitting Diode) has been interested as a next generation flat plane display because of its preeminent characteristics such as quick response characteristics, higher performance viewing angle, low power consumption, and panel floating. However, a trend of the display market is moving to three dimensional image processing instead of two dimensional flat display and various researches on display using hologram makes up for the difficulty in three dimensional display using typical flat display. In this study the Lenticular Screen Printing method is presented so that it can be applicable to organic semiconductor display devices and makes possible three dimensional display using flat display for complement the drawback of inorganic semiconductor.

• Proceedings of the Korea Society for Simulation Conference
• /
• 1998.03a
• /
• pp.50-55
• /
• 1998

In this paper we use discrete simulation method to get the criteria of system evaluation required in the case of designing the complicated probabilistic event system having discrete probabilistic variables and to search the effective and reliable alternatives to satisfy the objective value of the given system through on-line, single run within the short time period. If we find the alternative we construct the algorithm which change values of decision variables and determining alternative by using the stopping algorithm which end the simulation in the steady state of system. In order to prevent the loss of data when we analyze the acquired design alternative in the steady state we provide the background of the estimation of the autoregressive model and mean and confidence interval for evaluating correctly the objective function obtained by the small amount of output data through the short time period simulation.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2002.05a
• /
• pp.456-463
• /
• 2002

Nowadays. risk management in the enterprise is considered as the important activity. Risk management ran be defined as the activity which is the analysis of risk factors related to damages, the estimation of the magnitude of risk, and the determination of investment to protect damage in a company. Initially, risk management was originated in financial areas. But the concept of risk has been expanded in the enterprise. Most companies have extended their activities in various areas. In this tendency, most activities must be considered in supply chain So, risk management must be ronsidered as the concept in the viewpoint of supply chain. The framework of risk management in supply chain and the related mathematical model are represented in this paper. Risk management in supply chain ran provide a positive opportunity not only to protect various damages, but also to improve the relationship between partners.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2004.10a
• /
• pp.371-374
• /
• 2004

The ultimate purpose of Supply Chain Management (SCM) is maximizing the profits of the overall Supply Chain (SC) through increasing customer satisfaction and decreasing operating cost. It can be successfully accomplished only when SC system balances demands with supply activities coordinated by aggregate planning, mid-term level of Supply Chain Planning(SCP). However, the existing measures to mainly estimate the specific function of SCM are not enough to evaluate the state of SC with respect to the balance between supply and demand in operating. To solve this problem, we develop a new SC performance measure, Balancing Point, using momentum concept. a fundamental knowledge of physics. Momentum concept can explain the relation among objects so that it can consider the balance between supply and demand in SC operating. The developed measure can not only consider the current state of the SC system but also take planned but not executed supply activities and upcoming demands into account. Therefore, using Balancing point, we can be aware of the unbalanced state of SC in advance.

• Restorative Dentistry and Endodontics
• /
• v.16 no.1
• /
• pp.1-5
• /
• 1991

The purpose of this study was to investigate the color stability of 2 light - polymerized veneer resins and 3 heat - polymerized veneer resins. Five specimen discs of each brand were immersed in distilled water at $37^{\circ}C$, in darkroom for 120 days. The distilled water was changed on every third day to prevent contamination from micro - organisms. The color characteristics of all the samples were measured by computer controlled spectrophotometer. The appearence was characterized by means of the $L^*$, $a^*$ and $b^*$ uniform color space(CIELAB) and total color difference was calculated. The following results were obtained 1) ${\Delta}E^*ab$ - value in all brand except IS is were greater than 1 perceptable in visual evaluation. 2) ${\Delta}E^*ab$ - value in VI, IS and VG were lower than upper limit of acceptablilty(3.3 in ${\Delta}E^*ab$). DC was the worst in color stability and was changed into yellow color.

• 한국IT서비스학회:학술대회논문집
• /
• 2008.11a
• /
• pp.72-75
• /
• 2008

우리나라의 IT 산업과 기술의 발전은 전 세계가 부러워할 정도로 글로벌 경쟁력을 갖추고 있으나 다른 산업과의 융합, 특히 1차 산업과의 융합이 매우 저조한 상황이다. IT 기술을 1차 산업에 적용 하면 생산 정보 모니터링, 유통지원 시스템, 이력관리 시스템 등 다양한 서비스를 제공할 수 있어 1차 산업의 글로벌 경쟁력을 키울 수 있다. 본 논문에서는 IT 기술의 1차 산업에의 적용 방안 및 그 효과에 대해 기존의 연구 결과를 바탕으로 체계적으로 분석해 보도록 하겠다.