• 구강회복응용과학지
• /
• 제23권3호
• /
• pp.239-248
• /
• 2007

The accuracy and dimensional stability of rubber impression materials are very important for the fitness of the final restoration. The purpose of this investigation was to evaluate the effects of the storage time and pouring frequency of the additional silicone materials on dimensional stability. Total 30 impressions were made of tooth prepared single crown. The dies had 1 buccolingual, 1 mesiodistal and 1 occlusogingival lines. Two additional silicone materials(examixfine, aquasil) were included. 15 specimens were made of each impression material and poured by type IV stone over times(1hour, 24hours, 72hours) after mixing. 5 impressions poured after 1 hour were used for second pouring after 24hours and third pouring after 72hours. The same examiner measured each specimen 3 times after lazer scanning. All statistical tests were performed with the level of significance set at 0.05. The results indicated that significant difference at any measuring point of stone dies except the buccolingual and mesiodistal lines of the specimen made at 1hour after mixing with examixfine when measurements at 1hour, 24hours and 72hours were campared. There were significant difference between two impression materials and at every measuring point of stone dies made at second and third pouring. The length of measuring point increased significantly as time passed by and increase of the pouring frequency. However, this results are clinically acceptable except the dies of the third pouring. Under the conditions of this study, the shrinkage rate of the additional silicone rubber impression materials significantly increased as time passed by and increase of the pouring frequency.

• 한국주조공학회지
• /
• 제29권2호
• /
• pp.78-85
• /
• 2009

Functionally graded microstructure of centrifugal cast Al-Si alloy, especially distribution of primary Si particles according to the changes of melt pouring temperature and rotation frequency was investigated by numerical simulation. Moving velocity of Si particles increased as the melt pouring temperature and rotational frequency of mold increased. Therefore, segregation tendency of primary Si particles toward inner side of cylindrical sample increased as the melt pouring temperature and rotational frequency of mold increased. Rich distribution region of particles was located at 0.9, 0.7, 0.4 mm from inner surface of cylindrical sample under the centrifugal cast condition of $750^{\circ}C$ melt pouring temperature and 1500, 2000 and 2500 rpm mold rotational frequencies, respectively, by numerical simulation.

• 한국주조공학회지
• /
• 제28권1호
• /
• pp.25-30
• /
• 2008

To develop a functionally graded microstructure of cylindrical liner, effect of centrifugal casting parameters such as pouring temperature of hyper-eutectic Al-Si alloy melt, mold pre-heating temperature, and rotational frequency of mold on distribution of primary Si particles across wall thickness were investigated. Segregation tendency of Si particles toward inner side of cylindrical liner increased as the increase of rotational frequency of mold, pouring temperature of melt and mold pre-heating temperature. Especially, distribution density of primary Si particles within 1.5 mm from inner surface of cylindrical liner was above 35% under the centrifugal casting condition of $750^{\circ}C$ melt pouring temperature, $300^{\circ}C$ mold pre-heating temperature, and 2500 rpm mold rotational frequency.

• 한방안이비인후피부과학회지
• /
• 제10권1호
• /
• pp.139-158
• /
• 1997

A Literature study on the external treatment of nose diseases, the results are as follows; 1. Nose was called "Cheun-bin(天牝)", was outer orifice of the lung, was the gate of vital energe(氣), The main function of nose is divided three pacts. One is the respiration, another is the sense of smell, the other is the sounding consonance. 2. Nose is concerned with The Lung(肺), The Spleen(脾), The Heart(心), The Stomach(胃), The Large intestine(大腸), The Bladder(膀胱) in the organs, is concerned with Lung Meridean, Large intestine Meridean, Stomach Meridean, Heart Meridean, Spleen Meridean, Governor Vessel Meridean etc. 3. The method on the external treatment of nose diseases is classified with obstructive method, pouring method, blowing method, attaching method, plaster method, rubbing method, cleansing method, poulticing method. In frequency of practical use, Obstructive method is used 276 cases, Blowing method is used 123 cases, Attaching method is used 103 cases, Plaster method is used 76 cases. 4. In frequency of the medicinal works on the external treatment of nose diseases, Herba Asari(細辛) is used 134 cases, Pedicellus Melo(瓜 ) is used 85 cases, Radix Aconiti Praeparata(附子) is used 52 cases, Herba Agastachis(麝香) is used 51 cases, Semen Armeniacae Amarurn(杏仁) is used 44 cases etc. In frequency of a prescription on the external treatment of nose diseases, Tongcho-san(通草散) is used 9 cases, $Sesin-go{\cdot}Sinyi-go{\cdot}Changpo-san$ are used 8 cases, $Kwache-san{\cdot}Wungwhang-san$ are used 7 cases etc.

• 한국전기전자재료학회논문지
• /
• 제36권1호
• /
• pp.42-48
• /
• 2023

Abstract: In this study, an induction heating system using resonance is developed to remove remaining moisture and contaminations which could be generated during fabricating secondary batteries. This system is composed of power supply and induction coil. Power supply needs an oscillator, zero crossing detection, frequency tracking function, and induction coil needs a dummy coil to obtain a uniform temperature distribution. It is very important to obtain a uniform heating temperature distribution of battery cell case in the induction heating system before pouring electrolyte into battery cell. Experimental results show a temperature distribution deviation of below 1℃ in the external position of battery cell cases. As well, the temperature of battery cell itself shows distribution of 40℃±3℃.

• 한방안이비인후피부과학회지
• /
• 제22권3호
• /
• pp.208-219
• /
• 2009

Object : Understanding the importance of the external treatment of nasal polyps and let know the necessity of development of the effect of herb medicine to use in these days. Method : I investigated about 12 oriental medical texts which recorded the external treatment of nasal polyps. I separated them to three part (prescription, herb medicine, the way of making the external application) and check the frequency. Also compared the external treatment of oriental medicine and western medicine. Result : 1. Prescription: There are 48 prescriptions -Nyosasan is used 4 cases, Gwajungsan is used 2 cases and others only 1 case each. 2. Herb-med: There are 67 herb medicines - Herba Asari(細辛) is used 15 cases, Pedicellus Melo (瓜蔕) is used 11 cases, Alunite(白礬) is used 10 cases, Realgar(雄黃)is used 9 cases. 3. The way of making the external application: obstructive method is used 19 cases, attaching method is used 9 cases, blowing method is used 8 cases, plaster method is used 7 cases, pouring method is used 3 cases. 4. The treatment takes about 1day to 15days and the soften nasal polyps like a water can be expect the positive prognosis. Conclusion: The external treatment is very important to treat nasal polyps. So we need to research more on eliminating the toxicity of the herb medicine and develop the convenient way of using the external treatment.

• 동의신경정신과학회지
• /
• 제19권3호
• /
• pp.231-244
• /
• 2008

Insomnia is one of the highest frequency neuropsychosis of neuropsychiatry patients and is primarily caused by major depressive disorder. This case study is about a remedy for a 33 year-old woman who has insomnia and intense depressed mood caused by the continuous family jar. Also, she had the feeling of squeezing her body, pouring cold water into her body, anorexia and feeling cold and hot turn and turn. I operated mindfullness with accupuncture, herb-medication and aroma theraphy. Especially, mindfullness and Gagamguibi-tang were effective for relaxation and the sound sleep in quality and quantity. According to this study, the traditional oriental medical remedy such as accupuncture, herb-medication is effective for the cure of insomnia and mindfullness fortifies the oriental medical remedy.

• 한국음향학회지
• /
• 제30권5호
• /
• pp.249-254
• /
• 2011

PC의 내장 사운드 카드를 이용하여 음향학 탐구학습을 수행하였다. 사운드 카드는 함수발생기와 오실로스코프에 비해 가격이 저렴하고 학생들의 접근이 용이하다는 장점이 있다. 학생들은 다양한 음향 현상에서 발생하는 소리를 사운드 카드를 이용하여 녹음하고 주파수 스펙트럼을 분석하였다. 소리굽쇠의 맥놀이, Rijke 관에서의 음의 발생, 물을 따를 때에 나는 소리 변화, 소리로 포도주잔 깨기 및 포도주 병마개를 딸 때에 발생하는 소리 등의 현상을 정량적으로 분석하면서 소리의 중첩, 공진 및 정상파에 대한 탐구를 수행하였다.

• 한국건축시공학회지
• /
• 제11권5호
• /
• pp.468-481
• /
• 2011

This research presents a strategy and information system to manage the logistics of delivery ready mixed concrete (RMC) under the integrated environment of PMIS+RFID. PMIS is system tool and technique used in construction sectors to delivery information. Information that can be extracted electronically in real time is more valuable than data gathered and maintained manually. RFID technology can help to improve data accuracy through supply chains and by identifying products and objects at specific points through automatic identification. The objectives of these two implementations can be able to improve the efficiency of logistics management for RMC truck process, and to verify the technical and practical feasibility of PMIS+RFID application in construction industry. This may be realistic given the dynamics of daily activities on construction sites. This research is focused on examples on real world case study, applications and research theme related and connected to PMIS+RFID technology. It demonstrated that PMIS+RFID technology has been automatically implemented and has shown process information about the RMC truck and the overall status information about it, both quickly and accurately. As a result, the construction site where needs 300 $m^3$ pouring (50 RMC trucks) per day can be reduced total 250 minutes. Moreover, this time saving is related to the labour cost saving. From the case studies, RFID+PMIS system was proven in terms of effectiveness rather than current method.

• Computers and Concrete
• /
• 제32권4호
• /
• pp.411-423
• /
• 2023

The rapid development of road transport has increased the number of bridges that require widening. A critical issue in the construction of bridge widening is the influence of vibrations of the old bridge on the casting of wet joint concrete between the old and new bridges owing to the running traffic. Typically, the bridge is closed to traffic during the pouring of wet joint concrete, which negatively affects the existing transportation network. In this study, a newly developed microscopic traffic load modeling approach and the vehicle-bridge interaction theory are incorporated to develop a refined numerical framework for the analysis of random traffic-bridge coupled dynamics. This framework was used to investigate traffic-induced vibrations at the wet joint of a widened bridge. Based on an experimental study on the vibration resistance of wet joint concrete, traffic control strategies were proposed to ensure the construction performance of cast-in-site wet joint concrete under random traffic without interruption. The results show that the vibration displacement and frequency of the old bridge, estimated by the proposed framework, were comparable with those obtained from field measurements. Based on the target peak particle velocity and vibration amplitude of the wet joint concrete, it was found that traffic control measures, such as limiting vehicle gross weight and limiting traffic volume by closing an additional traffic lane, could ensure the construction performance of the wet joint concrete.