This paper is concerned with the optimal design of hyperbaric oxygen therapy system chamber with separated rooms for multi-users using stress analysis. Hyperbaric oxygen therapy is very important medical remedy for increasing the concentration of melted oxygen in human and animal body to recover the impaired cell for the healthy condition. This research proposed the proper procedures to design the physical specifications and investigate the mechanical design safety of hyperbaric oxygen chamber with two separated rooms using computational stress analysis with Solidworks program. The result of this research will be used to make the real size model of practical hyperbaric oxygen therapy system for multi-users with separated chamber.

Purpose: To assess the effect of orthokeratoly lenses on axial elongation in children compared with those wearing spectacles as control. Methods: We enrolled 100 subjects (aged 7-16 years; ortho-k, 50; control, 50) with myopia of -0.50 to -5.00 diopters (D), and with-the-rule astigmatism of -0.25 to -3.00 D. History of eye disease or surgery, strabismus and amblyopia were excluded from the study. The OK lenses used in this study were four-zone, reverse-geometry lenses with a nominal Dk of 140 Fatt unit. The corneal thickness, anterior chamber depth and axial length were measured by noncontact optic biometric device Lenstar LS900 and subjective and objective refraction, visual acuity and corneal curvature were measured before lens wear and the next day, 1 week, 1 month, 2 months, 3 months, 6months, 9months and 12months after lens wear. Results: There were no significant differences in age between groups (p>0.37). In the OK group, the spherical equivalent refractive error and central corneal thickness decreased significantly from -3.78±1.17 D at baseline -0.03±0.1 D, 1.17±0.57 LogMAR at baseline 0.00±0.01 LogMAR, 546.12±22.24 μm at baseline 527.88±23.26 μm 12 months after the treatment (p<0.001), whereas anterior chamber depth remained unchanged (p>0.15). In the spectacle group, anterior chamber depth was significantly increased by 0.04±0.03 mm (p=0.008). In 12 months, axial length increased from 24.99±0.68 to 25.21±0.72mm in the OK group and from 24.99±0.68 to 25.35±0.69 mm in the spectacle group that axial length increase was significantly different between groups (p=0.021). Conclusion: One year of OK in myopic children reduced anterior chamber depth and axial length elongation significantly compared with distance single-vision spectacle wear.

This paper is concerned with the mechanical design of hyperbaric oxygen chamber for multi-users using stress analysis. HBOT(Hyperbaric Oxygen Therapy) is very effective medical equipment for increasing the concentration of melted oxygen in human and animal body. The hyperbaric oxygen supplies to the impaired cell of human and animal to recover the healthy condition. This research reported the design specifications and mechanical safety of hyperbaric oxygen chamber using computational stress analysis with CATIA program. The result from this research can be used for making the practical HBOT equipment for multi-users and to manufacture the real model

The air brake chamber is needed higher sealing performance and durability for the safety and confidential operation, especially, in brake systems of commercial vehicle. For higher sealing, we applied new clamping technique differentiated methods of other global manufacturers. And we developed the power spring and spring guide made from light engineering plastic with high durability in repeated condition. We also have achieved the basic performance test like sealing test in compressed air and various environment tests in dust and salty water for new manufactured air brake chambers. As a result, the air brake chamber applied light weight and high durable power spring is satisfied all demand specification conditions for commercial vehicle

본 연구에서는 파장의 위상차를 변화시켜 균일한 살균을 유도할 수 있고 저전력으로 효과를 높일 수 있는 QRD(quadratic residue diffusor) 마이크로파를 이용하여 챔버 내부의 위치에 따른 온도변화를 측정하여 효율성과 균등성을 분석한 결과는 다음과 같다. 챔버 내부의 수직 35cm, 중앙 위치에서는 7kW 조사시 가장 효율이 높게 나타났고, 좌우측 위치에서는 5kW에서 효율성이 높았다. 그리고 마그네트론 No. 1, 2, 3에서 3kW로 하였을 때, Bar의 위치에 따른 온도 균등성은 1Bar와 2Bar의 위치에서는 거의 비슷하게 나타났다. 마그네트론 No. 3, 4, 5의 3kW로 하였을 경우에는 3Bar에서 온도가 약 10~ 20% 정도 높게 나타났고 마그네트론 용량을 5, 7, 9kW로 하였을 때, 조사 시간에 대한 평균 온도는 Bar의 위치에 무관하게 거의 유사한 형태로 증가하였다. 반면에 챔버의 적정 내용적에 대한 효율성은 조사용량에 반드시 비례하지는 않았다. 마그네트론 3kW를 60, 120, 180초 동안 조사하였을 경우 마그네트론 조사 위치에 따라 구석 부분에서 약 5~10oC 더 높게 상승하였고 수평면의 위치별 온도 분포는 비교적 균일하였으며 부분적으로 구 석부분에서 약간 더 온도가 상승하는 경향이 있었다. 마그네트론 5, 7, 9kW 조사에서는 Bar의 위치와 상관없이 전반적으로 온도가 비교적 균일하게 상승하고 있었다.

This study analyzed M. Kagel(1931‐2008)’s Anagrama(1957‐58) and G. Ligeti(1923‐2006)’s Aventures(1962) to present the diversity in the creation of vocal music during the latter half of the 20th Century. The point for the analysis of music was set through the analysis of vocal music by Kagel and Ligeti when the concept of ‘sound composition’, ‘language composition’, ‘vocal composition’ and others apply, and through the pieces of the composers who lived in the same era when it comes to the changes during the latter half of the 20th Century. Among Kagel’s numerous vocal music pieces, there were not many pieces that placed the ‘emphasis of the Phonetic aspect’ at the front without text. At best, they are Phonophonie, Hallelujah für Stimmen and Die Mutation. Ligeti’s compositional tendency in vocal music is slightly different from that of Kagel’s. Ligeti’s Aventures and Nouvelles Aventures, pieces based on the synthesis of the voice originated in actual diverse languages are the vocal music pieces of the 1960s that realize experimental thinking towards ‘stage piece’ from very early on. After this piece, Ligeti did not continue on this tendency. Along with Clocks and Clouds that uses the consonants and voiced vowels, 13 each, that follow the international phonetics’ phonetic notation and the mix of these instead of the text conform with Syntactics, and other pieces that used text such as Requiem, Lux aeterna, Drei Phantasien nach Friedrich Hölderlin, Nonsense Madrigals confirm this. Analysis of Kagel’s Anagrama shows that the composer did not set music to text. Instead, it was shown clearly that it was handled musically regardless of the contents of the text. Besides the conclusion that non‐semantics was realized or that another meaning was formed compared to the Latin phrase that serves as the basis of this piece, it includes the contents that could lead to yet another conclusion. Not only was basic Latin text used as Phonetic material, but it is possible to verify the conclusion that it embraces the meaning of linking to drama through analysis. Analysis of the Aventures composed of the Phonetic text that Ligeti himself explained in person according to E. Dieth and H. F. Wendt’s pronunciation presents diverse methods that can be defined as ‘vocal composition’ and verified the matters concerning ‘toning of the voice’(tone melody). Moreover, ‘musical gestures’ (crying, laughing, whispering, yelling, sigh and others) presented directly on the music note can be re‐appreciated with the opera‐like parody or caricature expression.

Air Brake chamber is a core fucntional part delivering the brake force to drum brakes in hybrid commercial trucks. This part needs to have leakage prevention and durability for reliable operation. As an actuator by air pressure, there has to be no air leakeage, and because it is operated with high tention power spring, there has high durable spring head, that contacted power spring directly. In this study, a spring head was designed new size on weak points structually and simulated by structual simulation program. And, a flange and body tighten by clamp ring was simlated structual deformation by assembly torque and inner pressure. As a result, new desgned spring head has structual stablilty over 1.7～14.7% and deformation is in proprotion to inner pressure but the assembly torque of clamp ring is not related to deformation.

This paper is concerned with formulating the design specification and making hyperbaric oxygen chamber for multi-users. HBOT(Hyperbaric Oxygen Therapy) is very effective remedy for increasing the concentration of melted oxygen in human and animal body. The melted oxygen supplies to each cell in body to recover the normal condition. This research reported the design specifications and mechanical test results of hyperbaric oxygen chamber made with polyurethane as well as computational analysis with CATIA program. These data can set the physical dimensions of practical HBOT equipment for multi-users and be used to produce the effective commercial model.

LNGC 주기관의 크랭크 챔버 내 유증기 폭발 방지를 위해 기존의 이산화탄소 가스인젝터가 부착된 오일미스트 감지기 외에 불활성가스 시스템을 설치할 필요가 있다. 특히, LNGC 선박은 액체질소를 손쉽게 확보할 수 있는 장점이 있기 때문에 액체질소를 이용한 불활성가스 시스템을 도입하기 위한 설계 기초 단계로서 해석적 연구를 시행하였다. 또한 액체질소 최소 소모량 시스템을 개발하기 위하여 층상류 모델을 적용하였으며, 층상류 흐름에 미치는 유로관경, 포화압력과 선박동요에 따른 배관 기울기 등의 영향에 대해서도 조사하였다. 또한 질소와 같은 극저온 유체들과 여기에 사용된 예측 모델과의 비교 검토를 통하여 극저온 유체에 대해서도 모델의 유효성을 검증하였으며, 액체질소 불활성가스 시스템의 액체질소를 가스로 상변환 시키는데 소요되는 가열기의 열부하도 예측할 수 있었다.

There has been a growing concern about the emissions of formaldehyde and VOCs from automotive interior materials which could have an important impact on the in-vehicle air quality(IVAQ) of automotive vehicles. Many leading automobile manufacturers have now introduced their own specification standards for testing and limiting emissions from products produced by their suppliers. In addition, ISO (International Standard Organization) has been established ISO 12219-1, 2, 3, 4, 5 to determine the emissions of volatile organic compounds from automotive vehicle. The objective of this paper is to compare the area specific emission rates determined from surface emissions testing using the microchamber(MC) in comparison with a 1 m³ emission test chamber(ETC) operated in accordance with ISO 12219-3, ISO 12219-4. Measured emission concentrations in absolute terms were different between Microchamber and 1 m³ chamber. However, qualitative comparison of the chromatograms shows that the Microchamber is able to perform a screening test

In the present work, bismuth nanopowders with various particle size distributions were synthesized by controlling argon (Ar) gas flow rate and chamber pressure of a gas condensation (GC) apparatus. From the analyses of transmission electron microscopy (TEM) images and nitrogen gas adsorption results, it was found that as Ar gas flow rate increased, the specific surface area of bismuth increased and the average particles size decreased. On the other hand, as the chamber pressure increased, the specific surface area of bismuth decreased and the average particles size increased. The optimum gas flow rate and chamber pressure for the maximized electrochemical active surface area were determined to be 8 L/min and 50 torr, respectively. The bismuth nanopowders synthesized at the above condition exhibit 13.47 of specific surface area and 45.6 nm of average particles diameter.

This study presented a development of a phototactic chamber used for pest monitoring. The chamber was constructed by opaque acrylic body. Transparent acrylic wall of the chamber for light-exposure were fitted at both side end parts of the inside chamber. Side parts of the outside chamber were made of removable cover in combination with the air circulation system and light source such as LED or fluorescent. The insect entrance holes was positioned at the center part of the chamber to efficiently dispersed pests, and then nylon net was equipped inside the chamber to prevent the escape of inserted pests. Two opaque partition walls of the inside chamber were made of the movable plate, in order to the control of the light-exposure and the response termination. We also carried out behavioral experiment against various pest species by using the phototactic chamber. Consequently, the phototactic chamber was confirmed suitable result of behavioral experiment. Therefore, we believed that the test chamber help to understand the phototactic responses of various pests.

MgTiO3 thin films were prepared by r.f. magnetron sputtering in order to prepare miniaturized NPO type MLCCs.MgTiO3 films showed a polycrystalline structure of ilmenite characterized by the appearance of (110) and (202) peaks. Theintensity of the peaks decreased with an increase in the chamber pressure due to the decrease of crystallinity which resultedfrom the decrease of kinetic energy of the sputtered atoms. The films annealed at 600oC for 60min. showed a fine grainedmicrostructure without micro-cracks. The grain size and roughness of the MgTiO3 films decreased with the increase of chamberpressure. The average surface roughness was 1.425~0.313nm for MgTiO3 films prepared at 10~70mTorr. MgTiO3 films showeda dielectric constant of 17~19.7 and a dissipation factor of 2.1~4.9% at 1MHz. The dielectric constant of the films is similarto that of bulk ceramics. The dielectric constant and the dissipation factor decreased with the increase of the chamber pressuredue to the decrease of grain size and crystallinity. The leakage current density was 10−5~10−7A/cm2 at 200kV/cm and this valuedecreased with the increase of the chamber pressure. The small grain size and smooth surface microstructure of the filmsdeposited at high chamber pressure resulted in a low leakage current density. MgTiO3 films showed a near zero temperaturecoefficient and satisfied the specifications for NPO type materials. The dielectric properties of the MgTiO3 thin films preparedby sputtering suggest the feasibility of their application for MLCCs.

In this chapter 8, I discuss a running piglet disease(奔豚氣病), its causes, symptoms and prescription. The name of the running piglet(奔豚) disease dates back to old times, and it is not clinically reported these days. The symptoms of the running piglet disease(奔豚氣病) is characterized by unberable pain in the lower abdomen, the chest and the throat, followed by complete disappearance of these symptoms with passage of time. In my view, the causes of the running piglet disease(奔豚氣病) can be divided into three categories: startle and panic, and the excessive fluid(水飮). In this chapter 13, I elaborate on three diseases: a wasting-thirst(消渴), a dribbling urination(小便不利),1)a strangury disease(淋病). I discuss these three diseases in one chapter because they share the same symptoms of thirst and abnormal urination and the symptoms occur mainly in the kidney(腎) and the urinary bladder(膀胱). A wasting-thirst(消渴) has the main symptoms of drinking water and eating food excessively as well as urinating a lot. A disease symptomized by thirst(消渴) is typically divided into upper wasting-thirst(上消), middle wasting-thirst(中消), and lower wasting-thirst(下消) by clinicians. Specifically, I discuss the mechanism of disease of upper wasting-thirst(上消) and lower wasting-thirst(下消), treatment principles of and prescriptions for upper wasting-thirst(上消) and lower wasting-thirst(下消), and pathology of middle wasting-thirst(中消) in this chapter. Based on the view that a dribbling urination(小便不利) is not a disease per se but a label for the symptom of short and insufficient urination, I discuss water amassment syndrome(蓄水證), yang bringtness disease pattern(陽明病), and a dribbling urination(小便不利) that is accompanied by various diseases. A strangury disease(淋病) has the main symptoms of insufficient and trickling urination that is often accompanied by pain perception. In this chapter, I discuss about stone strangury(石淋) in particular. These three diseases merit in-depth discussion since they are clinically observed with high frequency.

This study was conducted to analyze the variations of air temperature, relative humidity and pressure in a low pressure chamber for plant growth. The low pressure chamber was composed of an acrylic cylinder, a stainless plate, a mass flow controller, an elastomer pressure controller, a read-out-box, a vacuum pump, and sensors of air temperature, relative humidity, and pressure. The pressure leakage in the low pressure chamber was greatly affected by the material and connection method of tubes. The leakage rate in the low pressure chamber with the welding of the stainless tubes and a plate decreased by 0.21kPa·h-1, whereas the leakage in the low pressure chamber with teflon tube and rubber O-ring was given by 1.03kPa·h-1. Pressure in the low pressure chamber was sensitively fluctuated by the air temperature inside the chamber. An elastomer pressure controller was installed to keep the pressure in the low pressure chamber at a setting value. However, inside relative humidity at dark period increased to saturation level.. Two levels (25 and 50kPa) of pressure and two levels (500 and 1,000sccm) of mass flow rate were provided to investigate the effect of low pressure and mass flow rate on relative humidity inside the chamber. It was concluded that low setting value of pressure and high mass flow rate of mixed gas were the effective methods to control the pressure and to suppress the excessive rise of relative humidity inside the chamber.

This study was performed to analysis the concentration of TVOC, 5VOC and formaldehyde for building material of total 262 using 20L test chamber. The concentration of TVOC, 5VOC and formaldehyde were measured 1.001㎎/㎡･h, 43.032㎍/㎡･h, 0.012㎎/㎡･h, respectively. TVOC concentration of paint and floor covering occupied the largest concentration of the indoor building materials as 2.689㎎/㎡･h, 2.120㎎/㎡･h, respectively. 5VOC concentration of floor covering was measured 106.636㎍/㎡･h. Toulene and xylene were occupied the largest part of the 5VOC as 51.2% and 33.1%, respectively. The concentration of formaldehyde for furniture materials occupied the largest concentration of the indoor building material as 0.072㎎/㎡h.

This technology is to highly produce heat by microorganism during fermentation of mushroom sludge as a byproduct at farm field which would be established more competitive in mushroom growers and distinguished technology with ordinary mushroom growers. Furthermore this technology could be reduced energy as well as high efficiency in resource uses. There was highly reduction in energy consumption using by heat during fermentation of mushroom sludge which was produced by different media material with vegetable for mushroom cultivation. After 4 days the inner temperature during fermentation of mushroom media was a little changes of 61～50℃ and inner temperature of fermentation chamber was 55～45℃, inlet temperature of cooling water was 17℃, outlet temperature was 44～35℃, and ambient temperature was 28℃ at daytime and 14℃ at night time which was relatively constant. A heat exchange from fermentation chamber was 1090～648㎉/10min and the maximum heat exchange was 11550～1064㎉/10min which was caused to reduce fermentation heat with time The efficiency of heat exchange was distributed with 81～61% with time.