원통 아크릴 수조로 주입된 고온 기포의 수면 배출 온도 측정에 관한 실험적 연구

윤석태,조용진 한국산업정보학회 2023 한국산업정보학회논문지 Vol.28 No.6

고도의 생존성이 요구되는 잠수함은 군의 전략자산에서 가장 중요한 전투 무기체계 중 하나이다. 일반적인 재래식 잠수함은 추진시스템을 작동하기 위해 공기가 필요해 필연적으로 스노클 항해를 하며 잠수함 내부로 공기를 공급해야 한다. 그리고 스노클 항해 시 수중으로 배출된 폐기 가스는 주변 유체를 가열해 온도 항적을 형성하고 결과적으로 잠수함의 생존성을 감소시킨다. 본 연구에서는 수중 잠수함의 폐기로 인해 형성된 수면의 온도 항적에 관한 기초 실험 연구를 수행하였다. 이를 위해 국내 도입된 잠수함의 추진시스템과 항해 조건 자료를 수집하였으며, 온도 항적을 계측하기 위한 실험 시스템을 구현하였다. 실험 결과 수조로 주입된 고온 기포는 작은 크기로 부서져 주위를 둘러싼 유체와 유사한 수준으로 온도가 감소하였으며, 이를 열전대 센서로 확인하였다. 그리고 수면의 온도 항적을 계측하기 위한 열화상 시스템의 결과에서도 온도 항적은 계측되지 않았다. Submarines, which require a high degree of survivability, are among the most critical combat weapon systems in military strategic assets. Conventional submarines need air to operate their propulsion systems. Exhaust gases released into the water during snorkel navigation heat the surrounding fluid, producing a temperature wake. This wake, in turn, reduces the submarine's survivability. In this study, we conducted a preliminary experiment on the temperature traces formed by an underwater submarine's waste discharge. For this purpose, we collected propulsion system and navigation condition data from domestically introduced submarines and developed an experimental system to measure the temperature traces. As a result, we observed that high-temperature bubbles injected into the tank broke down into smaller sizes, and their temperature dropped to levels similar to the surrounding fluid. This observation was confirmed using a thermocouple sensor. Consequently, the thermal imaging system designed to measure the temperature trace of the water's surface did not detect any significant temperature traces.

황룡강 표층퇴적물의 퇴적환경

윤석태,고영구,오강호 全南大學校 師範大學 科學敎育硏究所 2003 科學敎育硏究誌 Vol.27 No.1

To consider sedimentological characteristics of surface sediments in Hwangryong River drainage system, total 23 sediment samples were analyzed in sedimentary texture and facies. The sediments are pebble to coarse sand of 3 .47ø- 1.67ø in grain size, 0.45ø- 3.23ø of poor soπing and very coarse to very fine skewed being biased positively. These sedimentary characters might be influenced by several factors as topography of channel gradient, water charge, surrounding geology. In particular, coarse poπions of channel deposits in the drainage were induced from the weathered products of surrounding area. 환경적으로 수권은 암석권과 상호 유기적이며 밀접한 관계를 가지고 순환한다. 수권과 암석권은 하천을 통하여 인간 활동과 밀접한 관계를 이루고 있으며, 하천으로 유입되는 다양한 물질들은 생물권 및 하상에 퇴적되는 퇴적물에영향을 주어 수중 환경의 변화를 가져온다. 특히 하천에 퇴적 되어진 퇴적물은 존재 형태에 따라 그속에 함유된 중금속의 물리 •화학적 변화 를 수반하여 하천수 중으로 재용출되거나 퇴적물 내에 침전될 가능성이 있기 때문에 하천환경에 대한 영향이 매우큰것으로 알려지고 있다.

무등산 안산암의 행인구조에 관한 연구

윤석태,이선,고영구,오강호 全南大學校 師範大學 科學敎育硏究所 2004 科學敎育硏究誌 Vol.28 No.1

It is important in geological teaching and learning that understandings on rocks might be directly performed in field outcrops. Under the scope, the study developed learning tools on recognitions of rocks in Mudungsan area. In particular, those tools are mainly of understanding the andesites in character, structure and texture. And, it is focused how to make amygdaloidal structures showed from the altered andesites in the area, additionally. The study area is mainly composed of granites, rhyolites, altered andesites, andesite porphyries and tuffs. Minerals forming the amygdaloidal structures are mostly of calcite, quartz, feldspar, epidote, biotite and muscovite. The structures are divided into mono- and poly-mineral filling types in origin. The poly-mineral filling types are subdivided into concentric, colloform, radial, zonal and fingerprinting ones.

영산강 상류역의 수질 특성 및 개선에 대한 고찰

윤석태,오강호,고영구 全南大學校 師範大學 科學敎育硏究所 2005 科學敎育硏究誌 Vol.29 No.1

To consider qualities and improvements for the stream waters of upper Yeongsan River drainage system, total of 54 water samples were taken from Yeongsan main, Hwangryong, Gwangju and Jiseok streams. On the basis of Pipers diagram, water qualities of these streams are corresponded to natural stream water on the whole. But BOD, COD, T-N and T-P are increased into downward in the streams. In particular, these values are highly increased at the encountered area between the above branch and the main streams. From above results, it is suggested to establish special law controlling these streams for water quality improvement as follows; the critical water quality indices to organic contaminations of T-N and T-P, the control of non-point contamination origins in relation with out-fluxing in rainfall time, specific water quality administration to encountered sites between main and each branched stream, and the consideration in the total amount of contamination to each branch streams.

함평군 일대에 분포하는 토양의 토성에 관한 연구

윤석태,고영구,나범수,오강호 全南大學校 師範大學 科學敎育硏究所 2007 科學敎育硏究誌 Vol.31 No.1

On the basis of soil analyses in Hampyeong area, A and B layers are dominantly developed in well weathered soils of the area. Those soil grain sizes are coarse to fine, showing a wide variation, and are poorly sorted. The soil characters directly influence to soil textures, and then, the texture types are classified into several kinds as clay, clay loam, sandy loam, sandy clay, and loam in the area. Soils in the area were formed in variable mixed ones including mountain piedmont and lower flat area environments, arid they are varied into brown soils with much humid material and deep weathered orange ones. Those soil characteristics might be brought on diverse agricultural types as ginseng and bamboo farms putting first of dry and water field ones in the study area.

섬진강 중․하류 퇴적물과 희토류 원소 분포 특성

윤석태,고영구,김종희,신상은,오강호 全南大學校 師範大學 科學敎育硏究所 2015 科學敎育硏究誌 Vol.39 No.1

This study considers analyses on the distribution of rare earth elements and the relations between grain sizes and these elements in the sediments of Seom Jin drainage system. The sediments are of -0.78 to 1.92 ∅ and assigned to very coarse to medium sands. Though the sediments are well to very poorly sorted in ranges of 0.36 ~ 2.32 phi (0.90 phi in average), most is well sorted below 1.0 ∅. Rare earth elements normalized by chondrites show that LREEs are more enriched relative to HREEs in the area. In correlation between grain size and the elements, the elements are strongly positively related with fine sands of 3 ~ 4 ∅. However, the relation between the elements and coarse sands of 0 ~ 1 ∅ is negative. La and Ce are enriched over 1. LREEs are more concentrated than HREEs, but whole REEs are low in the enrichment of the area.

용화-설천 지역에 분포하는 백악기 반상화강암의 암석화학 및 유체포유물에 관한 연구

윤석태,박희인 대한자원환경지질학회 1995 자원환경지질 Vol.28 No.5

해남 지역의 지질에 관한 연구

윤석태 全南大學校 師範大學 科學敎育硏究所 1998 科學敎育硏究誌 Vol.22 No.1

The stratigraphic sequences of the Haenam area are groupped into four units : (1) metamorphic rocks of Pre- cambrian, (2) intrusive rocks of Jurassic period, (3) volcaniclastic and sedimentary rocks of Late Cretaceous and (4) intrusive rocks of Late Cretaceous and Tertiary. Schists and Gneiss complex of Pre-Cambrian and schistose and biotite granite of Jurassic age are exposed at the base of this area on which the thick Cretaceous pyroclastic sediments were deposited. These old rocks are unconformably overlain by the volcaniclastic rocks of Late Cretaceous composed of Hwawon and Hwangsan formation. Biotite granite, micrographic granite, quartz diorite and porphyries of Late Cretaceous and Tertiary intruded into the pre-existed rocks above mentioned.

한국의 금은광화작용

윤석태 全南大學校 師範大學 科學敎育硏究所 1998 科學敎育硏究誌 Vol.22 No.1

This work is a metallogeny on gold-silver deposits in republic of Korea based on broad report of existing literature available. The metallogeny on the gold-silver deposits is mostly related to the granitic rocks. That is, gold-silver deposits distribute with in or near the areas of Daebo and Bulguksa granites. The metallogenic provinces are spatialy associated with some of the felsic to intermediate igneous rock, whereas the metallogenic epochs are temporarily connected with the igneous activities and tectonism. Gold-silver deposits are hosted in the granites and are also in Precambrian schists and gneisses, Paleozoic metasediments and carbonate rocks, as well as in Mesozoic sedimentary and volcanic rocks. In most of the vein deposits, the ores consists of electrum, argentite, native gold and silver, freibergite, polybasite, pyragyrite, miargyrite, tetrahedrite, canfildite, hessaite, jalpaite, tennantite, pearsite, stenbergite, boulangerite, cosalite, tetradymite, Ag-bearing chaicosite, stefanite, energite and base-metal sulfides. Homogenization temperatures and salinities of fluid inclusions range from 130'C to 454'C and from 0.0 wt.% to 12.9 wt.% NaCl equivalent, respectively.

STS를 활용한 중학교 지구과학 수업이 학생들의 과학에 관련된 태도에 미치는 효과

윤석태,박은영 全南大學校 師範大學 科學敎育硏究所 2006 科學敎育硏究誌 Vol.30 No.1

The purpose of this study was to propose STS (Science, Technology and Society) teaching-learning method to fit our educational environments and to investigate the effect of STS teaching-learning method on students' attitude by applying it to the locale of school education. First of all, in order to create an educational model that will be suitable for application of STS teaching-learning method, which will be different from the traditional teaching, 1 came up with a plan for teaching and learning having selected an appropriate topic and applied it thereto. The issues that 1 had dealt with putting the focus on were: First, does STS teaching learning method bring about a positive effect on students' learning attitude comparing with traditional teaching method? Second, if STS teaching-learning method exhibits more positive effect than that of traditional teaching, so then, on what attitude has it been mostly influential? The study was carried out by having sampled 4 classes of 1 st grade in middle school located in Gwangju Metropolitan City, and 1 divided them into Control Group and Test Group, consisting of two classes each of group. And 1 confirmed the homogeneity of each group by performing a pre-test beforehand, and applied STS teaching-learning method to the test group and the traditional teaching method to the control group, and then after, 1 tried to find out. changes between two groups through post-test. As for instrument for test, 1 used Test of Science-Related Attitudes (TORSA) that verified in connection with teachings about science. Results from these tests revealed the followings: First, both groups showed a positive change, however, the test group displayed a significant difference of change comparing with the control group. Second, STS teaching-learning method affected students' attitude more positively than that of the traditional teaching method, and it was influential positively on the students' attitude in the order of “" Interest in Learning about Science," “" Pleasure as for Science-Related Hobby," “" Attitude toward Quest for Science," and “" Application for Scientific Attitude." And girls revealed more changes than those of boys in the STS teaching-learning method, rather than the traditional teaching method. The results of these study works revealed that STS teaching-learning method affect the changes of students' attitude more positively comparing with the traditional teaching, therefore, STS teaching-learning method was much more effective in the locale of school teaching. Particularly, by proceeding learning class using materials and information excerpted and selected from media and everyday life, I could excite interests of students, in addition 1 was able to increase their concentration on study, for students could easily participate in discussions and also make speeches before peer students naturally through such procedures.