고로슬래그시멘트를 사용한 다공성 황토콘크리트의 성능 평가

김황희,강수만,박종식,박상우,전지홍,이진형,차상선,박찬기,Kim, Hwang-Hee,Kang, Su-Man,Park, Jong-Sik,Park, Sang-Woo,Jeon, Ji-Hong,Lee, Jin-Hyung,Cha, Sang-Sun,Park, Chan-Gi 한국농공학회 2010 한국농공학회논문집 Vol.52 No.3

This study aims to evaluate a porous concrete using hwang-toh, blast furnace slag and blast furnace slag (BFS) cement instead of type I cement. The tests that were carried out to analysis the properties of porous hwang-toh BFS cement concrete included compressive strength, continuous void ratio, absorption rate, and pH value, repeated freezing and thawing test were conducted. Test results indicated that the performance in porous hwang-toh concrete are effective on the kaoline based binder materials. The pH value were shown in about 9.5 ~ 8.5. The compressive strength was increased and void ratio was decreased with increasing the kaoline based binder materials, respectively. The void ratio and compressive strength were in the range of about 21 ~ 30 %, 8 ~ 13 MPa, respectively. The increased in void ratio of more than 25 % is showed to reduce the resistance of repeated freezing and thawing. Also, the resistance of repeated freezing of thawing and the compressive strength of porous hwang-toh BFS cement concrete are independent with hwang-toh content and BFS cement amount. But, the void ratio was decreased with increasing the high volume hwang-toh contents (more than 15 %).

실용음악 전공 학생들의 발성치료 전후 성대 및 음성 특성 비교

황연신,심미란,김철준,최용석,김상연,최찬호,선동일,Hwang, Yeon Shin,Shim, Mi Ran,Kim, Chul Jun,Choi, Yong Suk,Kim, Sang Yeon,Choi, Chan Ho,Sun, Dong Il 대한후두음성언어의학회 2016 대한후두음성언어의학회지 Vol.27 No.2

Background and Objectives : Many students major in applied music singing have various difficulties in phonation when they sing or perform. But the studies about this cause are lack. The purpose of this study is whether singing voice therapy based on vocal music is effective or not to applied music singing students that have difficulties in phonation. Materials and Methods : Singing voice therapy program had been done to 8 students major in applied music singing during 7 weeks. We did laryngeal stroboscope, perceptual, acoustic and aerodynamic examination before and after singing voice therapy to this students. And we studied post examination results have differences or improvements compared to pre examination results. Results : Four male students don't have effective improvement after singing voice therapy but they shows slight improvement in aerodynamic examination values compared to pre examination values. Four female students shows improvement in aerodynamic examination values and pitch range increasing. Above all, one student's vocal nodules disappeared after singing voice therapy. Conclusion : Singing voice therapy based on music singing is very effective to the students major in applied music singing. Above all, their curriculum in applied music singing should include phonation training based on music singing before training perform and technic practices.

GIS기법으로 복원한 일산지역의 Holocene 古地理

황상일 慶北大學校 師範大學 地理敎育科 1995 地理敎育 Vol.8 No.-

In this research through the outcome of research about Ⅱ-San area Gyunggi Bay province, on the basis of sedimemtary facies, environmental change of sedimentation and holocene sea level change, I recovered the paleogeography of alluvial low land and alluvial plain since around 7,000 B.P. by using GIS method. And also in this research, I examined the efficiency of explaining paleogeography using GIS, by comparing and investigating three-dimensional outcome with another topographical map drawn by two-dimension. The chief contents are summarized as follows: 1. The alluvial low land plain in Ⅲ-San area, from around 7,000 B.P. to almost 5,000 B.P. was under the influence of salt water flowed upstream through the paleo-river channel, which is 4 or 5m different from the surface of the adjacent alluvial plain in height, became inner bay environment influenced greatly by open-water then changed into a sallow swampy land environment by 3,200 B.P. and then by 2,300 B.P. it changed into inner bay environment and finally replaced by overflowing environment. 2. Since 7,000B.P there had been two transgressions and two regressions in turn. During thig period, the alluvial low lands were formed. Up to now, except the last 1000 years, it had been under the influence of salt water. This kind of environmental change seemed to have a great influence on the way of living of the prehistoric inhabitants, That is, we could verify in the result of antiquarian investigations that human activities were prosperous around 2,300 B.P. period, influence of salt water decreased. 3. This recovered ancient geography with three-dimension method, the relationship between human and nature since 7,000 B.P. can be analyzed and explained in various ways, if it's combined with archeological discovery. 4. The research of geomorphology in Korea is mostly about geomorphological surface of gentle slope and alluvial plain. Considering this kind of stream three-dimensional map method of GIS has some defects of exaggerating near hilly districts, comparing a contour line map with two-dimension, it is easy to understand by sight.

금강 하류역의 어류상에 관하여

황금화,전상린,김미옥,황종서 상명대학교 기초과학연구소 1992 기초과학연구 Vol.6 No.-

금강 하류역의 어류상을 밝히기 위하여 1990년 2월부터 12월까지의 기간에 월 2회씩 총 6개 조사지소에서 수온과 염분도의 측정 및 어류의 채집을 실시하였으며 그 결과는 다음과 같다. 1. 월평균 수온은 2월에 3.58℃로 가장 낮았고, 8월에 29.71℃로 가장 높게 나타났다. 조사지소별 평균 염분도는 St. 1에서 0.015‰로 가장 낮았고, St. 6에서 9.45‰로 가장 높았다. 2. 총 58종에 30,680개체의 어류가 채집되었으며, 종구성비로 볼 때 일차담수어는 21종(36.2%), 주연성담수어는 18종(31.0%), 그리고 해산어는 19종(32.8%)으로 나타났다. 3. 각 조사지소 중에서 St. 1, 2에서는 일차담수어가 우세하였으며, St. 3, 4에서는 주연성담수어가 우세하게 나타났고, St. 5, 6에서는 해산어와 주연성담수어가 우세하여 염분도 측정결과와 잘 일치하였다. 4. 총 58종 중에서 웅어 Coilia ectens, 누치 Hemibarbus labeo, 瘟歷早 Microphysogobio tungtingensis, 밀자개 Peltobagrus nitidus, 황줄망둑 Tridentiger nudicervicus, 오셀망둑 Lophiogobius ocellicauda, 강주걱양태 Repomucenus olidus 등의 어종에서는 계절적인 이동을 볼 수 있었으며, 이러한 이동은 수은 측정결과와 잘 일치하였다. 5. 총 58종 중 한반도 고유종은 일차담수어인 각시붕어 Rhodeus uyekii, 가시납지리 Acanthorhodeus gracilis, 왜매치 Abbottina springeri, 줄몰개 Gnathopogon strigatus, 긴물개 Squalidus gracilis majimae, 돌마자 Microphusogobio yaluensis 그리고 흰수마자 Gobiobotia naktongensis 등의 7종이었다. 6. 어류의 월별 체장분포로부터 황줄망둑 Tridentiger nudicervicus, 가실망둑 Acanthogobius ommaturus, 오셀망둑 Lophiogobius ocellicauda, 꺽정이 Trachydermus fasciatus, 그리고 돌가자미 Kareius biocloratus 등의 산란기와 생장율이 추정되었다. Fish fauna was investigated at six stations in Kum-river estuary during the periods from Feb. to Dec., 1990, twice a month. In order to reveal the environmental influences on fish fauna, water temperature and salinity were measured in each station. The results are as follows: 1. Water temperature was the highest with 31 C in Aug. (all stations) and the lowest with 2 C in Feb. (St. 4, 5, 6). Salinity was the highest with 16.45%0 at St. 6 in Feb. and the lowest with 0.06%0 at St. 1 in July. 2. From the study of fishes were identified a total of 58 taxa representing 22 family, 47 genera, 55 species and 3 subspecies. The composition of fishes based on habitats was composed of 21 primary freshwater fishes, 18 pheripheral freshwater fishes and 19 marine fishes, respectively. 3. Primary freshwater fishes were dominated at St. 1 and St. 2, while pheripheral freshwater fishes and marine fishes were dominated at St. 5 and St. 6. It was in accordance with the distribution of salinity gradient. 4. Among 58 taxa, Coilia ectens, Hemibarbus hbeo, Microphysogobio tungtingensis, Pelteobagrus nitidus, Tridentiger nudicervicus, Lophiogobius ocellicauda and Repomucenus olidus were to be a seasonal migrations, it was corresponded with the variations of water temperature. 5. Among 58 taxa, Rhodeus uyekii, Acanthorhodeus gracilis, A bbottim springeri, Gnatbpogon stn gatus, Squalidus gracilis majimue, Microphysogobio yaluensis and Gobiobotiu naktongensis were the Korean endemic species in this study area. 6. From the distribution of monthly body length, Tridentiger nudicervicus, Acanthogobius ommaturus, Lophiogobius ocellicauda, Trachydemzus fmiutus and Kareius bicoloratus, could be estimated the spawning periods and growth rate.

운동장애형 기능성 소화불량증 환자에서의 식도내압검사 성적

황일란,김진홍,이광재,김정민,함기백,조성원 대한소화관운동학회 1998 Journal of Neurogastroenterology and Motility (JNM Vol.4 No.1

납노출지표와 적혈구내 protein kinase C 활성도의 연관성

황규윤,황보영,안현철,김용배,리갑수,이성수,안규동,이병국 大韓産業醫學會 2001 대한직업환경의학회지 Vol.13 No.4

목적 : Protein kinase C는 칼슘-인지질 의존형인산화 효소로 'H VJ'tfO에서 납에 의하여 활성화되지만, 납에 노출된 인체내에서 그 영향을 평가한 경우는 얼다. 본 연구의 목적은 납에 직업적으로 노출되는 근로자를 대상으로 납 노출이 적혈구막의 단백질내에서 PKC 활성에 의한 인산화 수준에 영향을 주는지 알아보고자 하였다. 방법 : 1998년부터 국내 납 근로자를 대상으로 납에 의한 건강 영향조사가 4년간의 코호트 연구로 실행하였다. 1차년도에 630명의 납 근로자와 135명의대조군이 조사되었고 이들중 본 연구에서는 직업적노출이 되는 사업장에 근무하는 212명의 근로자를대상하였다. 156명의 남자와 56명의 여자 근로자를 대상으로 인구학적, 과거병력, 직업력 등을 구조화된 설문과 면접으로 조사되었고 납 노출 평가는 혈중 납농도 및 ZPP, 경골중 납농도를 측정하였다. PKC의 활성도는 적혈구막 단백질내 PKC 의존형인산화 수준으로 평가하였다. 적혈구막 단백질인spectrin과 band 4.9의 후인산화수준을 측정하여각 납 노출지표(혈중 납, ZPP, 경골중 납. 노출기간)와의 관련성은 다중회귀분석을 이용하였다. 결과 : 조사대상자의 평균(SD) 연령은39.1(10.0)세, 근무기간은 8.1(6.5)년 이었으며, 경골중 납농도는 범위가 0.8에서 290.8 trg Pb/gbone mineral로 평근(SD) 34.4(35.2) rig Pb/gbone mineral이었다. 적혈구막 단백질의 후인산화수준은 개인간 변이가 매우 컸으며, spectrin은 평균(SD) 540 7(304.1), band 4.9 SfkDa는198.6(78.2), 48 kDa는 247.7(83.3) PSL이었다.경골중 납농도와 노출 기간은 이들 후인산화 수준과역상관성을 보였으나(p(0.05), 혈중 납 농도와 ZPP는 상관성이 없었다(p)0.05). 가능성 있는 혼란변수를 통제한 상태에서도 경골중 납 농도와 노출기간은 이들 후인산화수준과 유의한 회귀계수를 나타내었다. 결론 : 만성적 납 노출에 의하여 적혈구내 PKC활성도는 영향을 받아 증가되어있는 것으로 평가되어 적혈구막 단백질의 인산화수준은 납의 노출지표로 이용될 수 있을 것이다. 납의 신경독성은 부분적으로 PKC의 활성도왁 관련되어 있을 기전을 배제하기 어렵기 때문에 PfC 활성도와 신경행동학적 기능과의 관련성 평가가 진행되어야 할 것이다. Objectives : Protein kinase C(PKC) , a calcium and phospholipid dependent enzyme, is activated by lead in vitro at picomolar concentrations. However, the effect of lead on PKC has never been studied in a human population. The purpose of the study was to evaluate whether lead exposure was associated with PKC mediated-phosphorylation in erythrocytes among lead workers. Methods : Two hundred and twelve lead workers were studied. To determine the levels of phosphorylation ir vivo, an in vivo back phosphorylation technique was used by adding PKC and γ-32P to preparations of erythrocyte membranes. We measured back phosphorylations of erythrocyte membrane proteins, spectrin, and 52 kDa and 48 kDa, as an indirect measure of PKC activation if vivo. Results : The mean(SD) age and exposure duration was 39.1(10.0) years and 8.1(6.5) years, respectively. Tibial lead ranged from 0.8 to 290.8 μg Pb/g bone mineral with a mean (SD) of 34.4(35.2) μg Pb/g bone mineral. The means(SD) of back phosphorylation levels of the three proteins were 540.7(304.1), 198.6(78.2), and 247.7(83.3) photostimulated luminescence units (PSL), respectively, by phosphoimager. After adjustment for potential confounding factors, tibial lead and exposure duration were significantly and inversely associated with back phosphorylation levels. One unit of increase in tibial lead (1 μg Pb/g bone mineral) is associated with a decline in spectrin, band 4.9 52 kDa, and band 4.9 48 kDa back phosphorylation levels by 1.4(p〈0.05), 0.34(p〈0.05), and 0.47(p〈0.01), respectively However, there were no associations between the back phosphorylation levels and either blood lead or ZPP levels. Conclusions : These findings suggest that the PKC activity in erythrocytes is increased by chronic lead exposure and that erythrocyte membrane protein phosphorylation may be a biomarker of lead exposure.

사춘기전 Ⅰ,Ⅱ급 부정교합 아동의 기도 면적, 혀의 위치와 안면 형태에 관한 연구

황용인,이규홍,이기준,김상철,조형준,천세환,박양호 대한치과교정학회 2008 대한치과교정학회지 Vol.38 No.2

본 연구는 사춘기 성장 이전의 I, II급 부정교합을 갖는 아동 환자들의 측모 두부 규격 방사선사진을 이용하여 두개 안면 형태를 조사하고 이들과 혀의 위치 및 면적, 기도의 면적과의 관계를 조사하여 비인두 기도 및 혀의 형태가 악골 및 부정 교합의 형태에 미치는 영향을 알아보았다. 9 - 11세의 교정환자 76명을 대상으로 측모 두부 규격 방사선사진상 ANB difference를 기준으로 대조군(I급 부정교합군: 0 ≤ ANB difference < 4.0)과 실험군(II급 부정교합군: ANB difference ≥ 4.0)으로 분류하였다. 혀 면적, 혀와 구개 사이의 면적, 비인두 기도 면적과 두개안면형태 항목을 측정하고 비교하여 다음과 같은 결과를 얻었다. 혀 면적, 혀와 구개 사이의 면적, 비인두 기도 면적은 II급 부정교합군과 I급 부정교합군 간에 유의한 차이를 보이지 않았다. Hyperdivergent안면 형태일수록 비인두 기도 면적이 좁았다. 안모의 전후방 수직 길이가 길수록 혀의 면적이 넓었고, 전안면 고경이 길수록 혀는 하방위치 하였다. 비인두기도 면적이 좁을수록 혀의 면적도 좁아졌다. 이상의 연구 결과 혀의 면적과 위치, 비인두 기도의 면적은 I급, II급 부정교합 간에 차이를 보이지 않으며 hyperdivergent 안면 형태 및 안모의 전후방 수직 길이와 관련이 있는 것으로 사료된다. Objective: This study examined the craniofacial morphology of young patients in their prepubertal stage showing class I, II malocclusion, by analyzing lateral cephalograms, and analyzed its relationship with tongue position, tongue space, and airway space in order to ascertain the effects of nasopharyngeal airway and tongue morphology on the form of the malocclusion. Methods: Seventy-six patients aging from 9 to 11 were divided into two groups depending on the ANB difference on the lateral cephalogram: Experimental grouP (CI II malocclusion group) showing 0 ≤ ANB difference < 4.0; Control group (CI I malocclusion group) showing 0 ≤ ANB difference < 4.0. The tongue space, space between palate and tongue, nasopharyngeal airway space and craniofacial morphology were compared between the two groups. Results: Tongue space, Palate-tongue space, nasopharyngeal airway space showed no significant differences between class I and class II malocclusion groups. Hyperdivergent faces were associated with smaller nasopharyngeal airway space. Longer anterior facial height and posterior facial height were associated with larger tongue space, and greater anterior facial height were associated with lower tongue position, Smaller nasopharyngeal airway space showed smaller tongue space. Conclusions: Tongue space and nasopharyngeal airway space showed no significant differences between class I malocclusion group and class II malocclusion group. Only anterior facial height and posterior facial height had an influence on tongue space and nasopharyngeal airway space.

ebXML 비즈니스 프로세스 변환기의 개발

황성진,박경환 동아대학교 정보기술연구소 2003 情報技術硏究所論文誌 Vol.10 No.2

We use an ebXML business process to define and to lead a business flow. An ebXML business process can be represented by a UML and an XML, and leads to interchange real-data according to a business flow within a messaging server. Now a messaging server that support an ebXML business process is little. Most messaging servers are based on an XML/EDI messaging server, and support a transport, routing and packaging of an ebXML. But a business process for each solution needs to translate into an ebXML business process, because a business process type for each solution is different. In this paper, we develop the translator for ebXML business processes in order to solve this problem, and use a Microsoft BizTalk Server 2000 as a messaging server.

CNUOS의 원형 설계

황영원,김봉환,이광일,김상하 충남대학교 자연과학연구소 1993 忠南科學硏究誌 Vol.20 No.1

An operating system is program modules within a computer system that govern the control of equipment resources such as processors, main storage, secondary storages, input/output devices, and files. CNUOS is a research project on distributed operating systems being carried out at Chungnam National University. Its goal is to investigate capability-based, object oriented systems and to build a working prototype system to use and evaluate. In this system, user-level server processes provide functions that have been traditionally provided by the operating system. This approach leads to a small(hence more reliable)kernel and makes it easier to provide, modify, and test new services. In this paper, The kernel prototype of CNUOS will be proposed.

消音器의 形態別 特性에 關한 硏究

황성만 公州大學校 産業開發硏究所 1998 産業開發硏究 Vol.6 No.-

This test is for obtaining the noise level and noise characteristics of a small disel engine. widely used in many country. The summary of results is as follows: 1. Attenuation of exhaust noise level is not influenced by increase of rotation rate. The noise level of the best muffler is as large as 94∼98dB, which is over the noise limit. 2. The effective noise level of a normal muffler is 80∼87dB, which is over the noise limit as 65dB. Therefore the performance of noise reduction should be improved urgently. 3. The center frequency of noise is in the range of 240∼270Hz. It is not quite different from that produced by engine. 4. Probability of appearance of larger noise than the effective noise level that is a measure of deciding attenuation level is in the range of 40∼50%. It is abnormal distribution of noise. 5. Attenuation as the final performance of a muffler is 4∼17% of noise by engine. The best muffler shows 16∼17% noise reduction and the worst muffler shows 4∼6% noise reduction. The results shows that there is a large different in the performance between mufflers.