• Journal of the Korean Society for Nondestructive Testing
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• v.14 no.4
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• pp.244-249
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• 1995

Infrared(IR) thermography method was developed as a result of an investigation into a means of deriving a more visual method of temperature analysis. It recently provides an excellant nondestructive testing(NDT) technique in a variety of industries such as nuclear power plant, fossil plants, etc.. This paper offers a basic principles of infrared radiation, the nature of instruments used for measurement and the applications.

• Economic and Environmental Geology
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• v.20 no.3
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• pp.159-168
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• 1987

Some physico-chemical properties such as surface area, moisture content, cation exchange capacity, swelling rate, pH, viscosity and liquid limit have been determined for evaluation of Cabentonite deposit occurring in four localities; Yonil, Gampo, Haseo and Pohang, in Gyeongsang-do. Montmorillonite contents can be derived from surface area measurement. Enhancement of liquid limit values and swelling volume were observed in the samples which had higher exchangeable Na ion and finer particle-size distribution. Identical results were observed even in the Na-exchanged samples. This suggests that aggregation effects have a great influence on physico-chemical properties. Aggregation of montmorillonite were controlled not only burial depth but also composition of exchangeable cation. Consequently, sample occurred in Yonil area where has the greatest burial depth in the area show somewhat lower physico-chemical properties than those of samples occurred in the other localities. However, the basic test applied in this study provides very useful preliminary information relating to its commercial potential.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.22 no.1
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• pp.18-22
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• 2011

Laryngeal framework surgery comprises medialization laryngoplasty and arytenoid adduction. Since their introduction in the 1970s, these procedures have become standard treatments for vocal fold paralysis and glottal incompetence. However, frequency of laryngeal framework surgery is conjectured to relatively decrease along with the introduction of injection laryngoplasty. In this manuscript, indications for laryngeal framework surgery were highlighted in contrast to those of injection laryngoplasty. The authors introduced the basic concepts and principles as well as surgical techniques of laryngeal framework surgery. Even though the incidence of major and/or minor complications after laryngeal framework surgery is not high, surgeons should be well aware of its possible complications and they should be familiar with tips and know-how to avoid or cope with complications.

• Proceedings of the KIEE Conference
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• 2001.11b
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• pp.63-66
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• 2001

In the Poolco model, the bidding game is executed periodically. The player participating to the bidding game accumulates the information of others' strategies and payoffs through the repeated process. Thereby, he is able to map out how he gets his maximum profit, and proceed to the optimal strategy region. This paper shows the algorithm for a player to determine his strategy in t period based the information of the game results of t-1, t-2 period. And this algorithm can be formulated by using Dynamic game theory.

• KIEE International Transactions on Power Engineering
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• v.5A no.2
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• pp.199-203
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• 2005

This paper proposes the level of price cap in the TWBP(Two- Way Bidding Pool) market in Korea for which the draft of market design has been prepared by KPX. Max - GMCP(Maximum Generation Market Clearing Price) and APC(Administered Price Cap) would be separately applied as individual price caps for a normal period and a Price Capping period in TWBP. The level of price cap is determined for inducing optimal investment in the Korean Electricity Market considering the 'electricity resource baseline plan' published by the Korean government in 2002 for maintaining government-leading resource planning in Korea. In this regard, Max - GMCP is calculated from the equilibrium condition of investment based on reliability standard and fixed cost of the peaking plant. For verifying the propriety of the proposed price cap, this paper compares the proposed value with the estimated VoLL(Value of Lost Load) based on Korea's GDP(Gross Domestic Product).

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.825-828
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• 2007

This paper presents a thermally adaptive driving (TAD) technology for response time compensation of LCD with integrated sensor. The TAD is comprised of analog sensor signal conditioning and a digital feedback algorithm. Utilizing with a digital feedback system, TAD reduces response time of nearly 50% over the temperature range $0^{\circ}C-60^{\circ}C$.

• Journal of Animal Environmental Science
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• v.19 no.2
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• pp.149-154
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• 2013

This study was conducted to investigate the expression of harmful social behaviours in breeding pigs. Totally 64 pure breed pigs were assigned to determine the effect of breed (Yorkshire and Duroc) and sex (male and female) on the expression of each harmful social behaviours at the GGP level commercial breeding farm. Sucking, bothering, fighting and pushing behaviour were selected the notable harmful social behaviour. The most prevailing and the highest proportion of time spent in harmful social behaviours were bothering and sucking, respectively. Total frequency of bothering and fighting were more in Duroc than Yorkshire. Yorkshire had more proportion of time spent in sucking whereas fighting was more in Duroc. According to sex, female pigs had more frequency of sucking and pushing whereas fighting was significantly more in male pigs. The female pigs showed more time spent in sucking whereas bothering and fighting was more in male pigs.

• The Korean Journal of Archival Studies
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• no.72
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• pp.205-239
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• 2022

Park Yong-gil's personal letter 'To You' collection is a valuable historical document that contains aspects of modern and contemporary Korea, managed by the Late Spring Moon Ik-Hwan Memorial Foundation. These letters were written for about 10 years and 3 months, and there are currently about 2,304 letters left, and support is needed to secure social feasibility for long-term preservation of historical materials and to establish a stable record management system. The purpose of this article is to introduce Park Yong-gil's letter, which has not been introduced in earnest, to the archival community, and to comprehensively review the whole story and examine the tasks. To this end, the meaning of the letter in Park Yong-gil's personal life was examined, and the value of this letter was particularly highlighted in terms of being a letter written as a part of Okbaraji. And by investigating and analyzing the status of the archives, the internal and external characteristics of the letter were comprehensively analyzed. The characteristics of Park Yong-gil's letter identified as a result of the study are that it is a letter sent to one person, and it is accumulated with a considerable amount and aggregation. In particular, it is expected to have a diverse user base in that it is easy to empathize with because it contains the familiar subject matter of letters and the stories of contemporaries, and contains a variety of informational values about contemporary events and people. Based on these historical and cultural values and various useful values of the letter 'To you', various research and development of services should be made in the future.

• Journal of the Korean Society for Precision Engineering
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• v.18 no.7
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• pp.143-148
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• 2001

In this study, a mechanistic model of cutting force components in up and down end milling process is presented. Using this cutting force model of 4-tooth endmills with various helix angles, cutting force variation of inconel 718 has been predicted. Predicted values of cutting force components are coincide well with the measured ones. As helix angle increases, overlapping effects of the active cutting edges increase. In up endmilling the magnitudes of radial and feed cutting force componts FX and FY are lowest when the helix angle is $40\{\circ}$, but in down endmilling the magnitudes of these values increase slightly as helix angle becomes large.

• Journal of Microbiology and Biotechnology
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• v.12 no.3
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• pp.406-410
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• 2002

A new spin filter consisting of $50{\mu}m$ (nominal pore size) depth fitters rolled on a stainless steel grid was developed, using Saccharomyces cerevisiae as a model suspension cell to evaluate the spin filter performance. In a 1.8-1 fermentor with a rotation speed of 300 rpm and perfusion rate of 4 ml/min, a cell concentration of 49 g/l and ethanol concentration of 45 g/l from 100 g/l glucose could be obtained in a perfusion culture. The major mechanisms for cell separation used by the large-pore spin filter appeared to be centrifugal force and pivotal movement of the cells in the spin filter.