• Advances in concrete construction
• /
• v.5 no.4
• /
• pp.359-375
• /
• 2017

This paper presents a study of the properties and behavior of self-compacting concretes (SCC) in the hot climate. The effect of curing environment and the initial water curing period on the properties and behavior of SCC such as compressive strength, ultrasonic pulse velocity (UPV) and sorptivity of the SCC specimens were investigated. Three Water/Binder (W/B) ratios (0.32, 0.38 and 0.44) have been used to obtain three ranges of compressive strength. Five curing methods have been applied on the SCC by varying the duration and the conservation condition of SCC. The results obtained on the compressive strength show that the period of initial water curing of seven days followed by maturation in the hot climate is better in comparison with the four other curing methods. The coefficient of sorptivity is influenced by W/B ratio and the curing methods. It is also shown that the sorptivity coefficient of SCC specimens is very sensitive to the curing condition. The SCC specimens cured in water present a low coefficient of sorptivity regardless of the ratio W/B. Furthermore, the results show that there is a good correlation between ultrasonic pulse velocity and the compressive strength.

• Archives of Plastic Surgery
• /
• v.35 no.3
• /
• pp.349-353
• /
• 2008

Purpose: There are 3 well-known surgical procedures to treat Pierre Robin sequence: tongue-lip adhesion, distraction osteogenesis of mandible, and tracheostomy. The classical tongue-lip adhesion is an effective way to keep airway. The tongue, however, becomes quite non-mobile and appears dormant until the patient could control upper airway and the adhesion can be maintained for prolonged period. Most of all, this procedure does not provide the correction of the micrognathia. Distraction osteogenesis is a good technique to correct micrognathia and to prevent tracheostomies in patients with Pierre Robin sequence. But airway keeping procedure is needed during the distraction period. The purpose of this study is to determine the usefulness of temporary tongue-lip traction during the initial period of mandibular distraction in Pierre Robin sequence patients with severe airway problems requiring operative procedure. Methods: It was a prospective study of 2 Pierre Robin sequence patients aged between 4 months and 6 months requiring surgical procedure to correct recurrent and severe pulmonary complications. Two patients underwent distraction osteogenesis of mandible. During the operation, deep one tension suture was performed to tract the tongue and lip. When the patient gained control of upper airway at the initial period of distraction and micrognathia was corrected, the traction suture was removed. Results: All patients were followed up. No patients complained severe pulmonary complications and tracheostomy could be avoided. No patients had severe pulmonary complication. The pulmonary condition of patients was good. Conclusion: In severe Pierre Robin sequence case, temporary tongue-lip traction is a good assistant method in distraction osteogenesis because this method can avoid tracheostomy.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.14 no.4
• /
• pp.139-148
• /
• 2006

Valve train is one of the important noise sources in idling engines. Valve train noise comes mostly from two different impacts. One is the impact between cam and tappet at the beginning of the valve open period, which is an important source of impulsive noise of valve trains. The other is the impact between valve and valve seat at the closing of the valve open period. In case of mechanical lash adjusters, it is very difficult to control the initial impact. In this paper, we designed various types of cam profiles, especially in the opening ramp design, and investigated the effect of cam profiles on the magnitude of the initial impact. The effects that some cam design parameters have on the impulsive noise are also observed.

• Asian-Australasian Journal of Animal Sciences
• /
• v.1 no.4
• /
• pp.219-222
• /
• 1988

Degradation of deoxyribonucleic acid(DNA) and ribonucleic acid(RNA) by cell-free extract of mixed rumen protozoa of buffalo rumen was investigated. DNA was observed to be degraded rapidly during an initial incubation period of 2 hr with simultaneous appearance of degradation products. RNA on the other hand recorded a rapid degradation during an initial incubation period of 1 hr. RNA degradation products appeared upto an incubation period of 2 hr. DNA was observed to degrade into oligo- and mononucleotides. pyrimidine nucleosides, purine nucleoside adenosine and bases xanthine, hypoxanthine and thymine. Degradation products of RNA comprised of pyrimidine nucleosides, purine nucleoside, adenosine and bases xanthine, hypoxanthine and uracil besides oligo- and mononucleotides.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.8 no.1
• /
• pp.37-42
• /
• 1979

It was performed to find out the influence of duck meat on human serum cholesterol level. The duck meat was canned and given to the subjects. In case of human, the subject was divided into two groups; such as a male group and a female group. Blood sample was collected from each subject during feeding period and the serum cholesterol was determined by Bloor method. The results were as follows: 1. In the male group, serum cholesterol level was 187mg% on the initial day, 184mg% on the 3rd day, 181 mg% on the 6th day, and 178.8mg% on the 9th day after feeding period passed. 2. In the female group, serum cholesterol was 184mg% on the initial day, 181.4mg% on the 3rd day, 178.2mg% on the 6th day, and 173.8mg% on the 9th day after feeding period passed.

• English Language & Literature Teaching
• /
• v.18 no.3
• /
• pp.77-92
• /
• 2012

This paper explores the learners' experience process and features in the initial stage of extensive reading process through college students' daily based journal writings. The subjects of this study were 10 volunteer students and they kept their journals from 30 minutes to 2 hours daily based for two weeks. The participants took pre and post tests in order to find out how their reading comprehension ability improved. Four of them improved it while the rest of them did not. After writing journals for two weeks, all students agreed on the potential power of extensive reading. In addition, they realized their learning problems and tried to overcome them on their own ways. Although the research period was only two weeks, the students showed the potential of extensive reading in learning English. From the results of the study, extensive reading encouraged the students to read more and they were convinced that extensive reading will lead to successful learning English. It can be meaningful outcome from the 2-week period research. Thus, a longer period scheme could provide more detail information to the extensive reading.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
• /
• 1997.11a
• /
• pp.477-483
• /
• 1997

Experiments have been performed to investigate the formation of smoke layer in case of several furniture fires such as trashcan, chair, carpet, sofa, mattress, and wardrobe in a residential room. As a result of the present investigation, the uniformly distributed fire of carpet showed that the ignition and the initial growth period were relatively short while the fully developed period was considerably long. The concentrated fires such as mattress and wardrobe showed that the ignition and the initial growth period were relatively long. The descending time of the interface heights was within 1-3 minutes to reach around 1m. However, the interface height was lowered to 0.25-0.75m above the floor at the time of the maximum temperature.

• Journal of architectural history
• /
• v.28 no.2
• /
• pp.41-52
• /
• 2019

Seongjeonggak Hall in Changdeokgung Palace, although built after the Japanese Invasion in 1592, displays the architectural style and structure of Early Joseon period. It did not include ondol (Korean floor heating system) and contained Early Joseon style window frames. Later, King Jeongjo installed ondol as he repaired the building into a more convenient office. The initial construction of Seongjeonggak Hall was based on the architectural ideology of the Early Joseon Period, which divided up the space according to the season. Thus, the initial structure of the building consisted of a joint of a one-story building and a two-story building with the top floor of the latter specialized for hot and humid season. The two-story building was called 'chimnu(寢樓)', and its top floor was called 'nu-chimsil(樓寢室)'.

• Journal of Oriental Neuropsychiatry
• /
• v.34 no.1
• /
• pp.33-42
• /
• 2023

Objectives: This study was conducted to observe the progression of symptoms according to the treatment period of patients with social anxiety disorder who received complex Korean medicine treatment. Methods: The medical records of 25 patients who were diagnosed with social anxiety disorder according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, and received complex Korean medicine treatment (herbal medicine, acupuncture, and Korean psychotherapy) for 12 weeks were analyzed. The State-Trait Anxiety Inventory (STAI), the Beck Depression Inventory-II (BDI-II), the Beck Anxiety Inventory (BAI), the Korean-Social Avoidance and Distress scale (K-SAD), and the Korean-Fear of Negative Evaluation (K-FNE) were measured at the initial hospital visit and during the 4, 8, and 12 weeks of treatment to evaluate the effectiveness of treatment. Missing values were replaced with the average evaluation index value at that time. Results: 1) Statistically significant changes in STAI-X1, STAI-X2, BDI-II, BAI, K-SAD, and K-FNE scores were seen according to the time of treatment. 2) When scores were compared between each treatment time point, STAI-X2 and BDI-II showed statistically significant changes between the initial visit and four weeks of treatment, the initial visit and eight weeks of treatment, and the initial visit and 12 weeks of treatment. STAI-X1 and K-FNE showed statistically significant changes between the initial visit and eight weeks of treatment and the initial visit and 12 weeks of treatment. There was a statistically significant change in BAI scores between the initial visit and the 12th week of treatment. Conclusions: Complex Korean medicine treatment alleviated anxiety, depression, fear, and avoidance of social situation symptoms in patients with social anxiety disorder. The longer the treatment period, the more symptoms tended to be alleviated. However, the evidence should be supplemented with prospective, controlled research.

• Journal of the Korean Society for Geothermal and Hydrothermal Energy
• /
• v.13 no.2
• /
• pp.16-21
• /
• 2017

In this study, the flow effect of warming and cooling in the air supply of a pit for air conditioning were evaluated in BS art museum. We simulated the flow temperature for a pit winter and summer seasons using computational fluid dynamics. Consequential, energy saving, energy saving costs and initial payback periods were calculated and the following conclusions were drawn. The warming effect of the winter increased by $18.1^{\circ}C$ and $0.2^{\circ}C/m$ and the cooling effect of the summer decreased by $6.1^{\circ}C$ and dropped to $0.07^{\circ}C/m$. Energy saving appeared to be 19.1 kW in the summer and 54.3 kW in winter. Energy saving costs ranged from 2,567,119 won/year to 5,134,238 won/year and at minimum, initial payback period for initial investment was 3.9 years. As a result, the air supply system using an existing pit without any burden on initial investment costs is believed to contribute to energy saving through warming and cooling of unutilized energy effects.