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.

지대치 재료의 환경변화에 따른 물리적 성질에 관한 연구

황유숙,최경규,박상진 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.2

The purpose of this study was to measure the flexural strength and hardness of four core materials in 4 different medias and to evaluate the relationship between the physical properties. For the flexural strength, the specimens were prepared from each of the following materials: Bisfil Core, Core Max, Fuji IX GP, Miracle Mix and randomly divided into four groups and stored at 37 degree C in the following medias: distilled water for 24 hours (DW/1), distilled water for 30 days (DW/30). 2%NaF for 30 days (NF/30), 0.02N lactic acid for 30 days (LA/30). After storage, the specimens were subjected to flexural strength testing and calculated to flexural modulus. For hardness testing, specimens were prepared from four materials and storaged in the uniform way. After storage, the specimens were subjected to Vicker's hardness testing. 1. The flexural strength of Core Max were the highest, and the flexural strength of Miracle Mix were the lowest. 2. The hardness of Bisfil Core were the highest. 3. The hardness of Core Max were the highest. 4. The hardness of Miracle Mix were the lowest. 5. 2%NaF and 0.02N lactic acid negatively affected the flexural strength and hardness of four core materials. 비금속 지대치 재료의 구강 내 환경변화에 따른 물리적 성질을 구명하기 위하여 4종의 지대치 재료를 다양한 환경에 보관한 후 굴곡강도 및 표면경도의 변화를 관찰하여 조건에 따른 영향을 구명하고자 이 연구를 시행하였다. Bisfil Core, Core Max, Fuji IX GP, Miracle Mix를 사용하여 굴곡강도 측정을 위한 시편을 제작한 후 최대하중을 측정하여 굴곡강도와 굴곡탄성계수를 계산하였다. 표면경도 측정을 위하여 아크릴릭 레진블럭에 상기 4종의 재료를 충전하여 중합시킨 후 순차 연마하여 경도측정을 위한 시편을 제작하고 Vickers hardness를 계산하였다. 1. 굴곡강도는 Core Max에서 가장 높고 Miracle Mix에서 가장 낮았다. 2. 37℃ 증류수에 24시간 보관한 군에서 Bisfil Core가 경도가 가장 높았다. 3. 30일 저장군에서는 Core Max가 경도가 가장 높았다. 4. 모든 군에서 Miracle Mix가 가장 낮은 경도를 나타냈다. 5. 2% NaF용액과 0.02N lactic acid용액은 증류수보다 지대치 재료의 굴곡강도와 표면경도를 저하시켰다.

粘土의 壓密 特性

黃成一 울산대학교 1975 연구논문집 Vol.6 No.1

粘土의 壓密特性을 觀察하기 爲하여 蔚山地域 粘土에 對하여 標準壓密試驗의 結果를 Rheological model 理論에 依해서 여러가지 Soil Parametr를 分析하여 서울 近方 金浦地域의 灰色粘土에 對한 結果들과 比較檢討하였다. 이때 算出된 Soil Parameter는 Soil Skeleton의 一次壓縮性과 二次壓縮性 Parameter와 Dashpot의 粘性係數이다. 또 이들 Parameter에 依하여 一次壓縮性에 對한 二次壓縮性의 相對的 重要性을 나타내는 Compressibiity Ratio와 二次壓密이 일어나는 程度를 보여 주는 Rate Factor 를 求하여 比較檢討하였다. The consolidation characteristics of clay were studied in three kinds of samples by the method of one-dimensional consolidtion Tests. Soil samples were tested at the liquid limit. The test results were analyzed by the method of Gibson and Lo's Rheological Model Theory.

Gustav Mahler Symphony 의 Orchestration에 대한 槪括的 考察

黃聖起 全南大學校 藝術硏究所 1999 藝術論集 Vol.3 No.-

From the end of the 19th century to the beginning of the 20th century, Europeans experienced growing social instability and fear which were caused by the ideological conflict between developing capitalism and rising socialism. Meanwhile the history of music witnessed the decline of Romanticism, which had been developed by German musicians, and it wecomde the advent of post-Romanticism. The achievement of Gustav Mahler (1860-1911), one of the most influential musicians of the time, bridges the gap between those two musical trends. Overcoming painful misfortunes that originated from his Jewishness and the premature death of his daughter, he established himself as a great composer in the history of music by putting his enoumous passion and energy into composing musical works. He dreamed of becoming a great composer rather than a conductor, and realized his dream through exceptional effort. Mahler, who represents German post-romantic music, not only revived symphony, which seemed to have diappeared after Brukner and Brahms, but also developed it with his unique technique of composition. His musical taste and tendency was sometimes criticized by some musicians during his lifetime, but the importance of his achievement as well as his artistic talent began to be recognized after the second Would War. He had a great influence on succeeding composers such as Schoenberg, Berg, and Wbern by restoring the tradition of syphony of the 19th century and by starting a new technique of composition at the same time. Based on his symphonies, his musical life can be divided into three stages. The works from the first period is characterized by the mixing of programme and folk music with some degree of vocal music. This quality of folk music and vocal music disappeared during the second period of his musical life, which is characterized by a neo-classical dependence on purely instrumental music and an emphasis on complete forms. The tendency of the third period is so progressive that we can feel the limit of tonality. During this period the mode of vocal music reappeared, being consistent with the mode of purely instrumental music. In particular Mahler's unique achievement encompasses the enlargement of movement numbers, the radical cross of tonality, the use of polytonality, the development of grand scale of orchestra, and the chamber music technique based on his characteristic orchestration and linear counterpoint. Considering that the importance of Mahler's symphonies is relatively under-estimated and insufficiently studied, in this paper I intend to illuminate anew the values of his symphonies by evaluating his creative and experimental spirit reflected in his works. First I will examines the life and musical world of Mahler as a background to his symphonies, second I will studies the characteristics of his symphonies in a comprehensive manner, and finally I will try to find a proper place for his musical achievement in the history of music.

이방향성 형상기억합금을 이용한 공동 주택용 방화 댐퍼 설계 연구

황성태,이찬희,장진수,변창수,히식수렝,이상욱 순천향대학교 산업기술연구소 2022 순천향 산업기술연구소논문집 Vol.28 No.2

The purpose of this paper is to redesign, compare, and study using bi-directional shape memory alloy spring to compensate for the shortcomings of the existing fire damper performance. Through the spring constant measurement experiment, using the difference in force between the coil spring and the shape memory alloy spring, the damper closes when the set temperature is reached, and opens again when the temperature is lowered. In addition, the internal structure was redesigned through smoke leakage experiments. As a result, semi-permanent usable dampers were modeled.

한강 하류 김포평야의 최종빙기 이래 퇴적환경변화

황상일,김혜령,윤순옥 경북대학교 사회과학대학 지리학과 2003 地理學論究 Vol.- No.23

한강하류부에 위치한 김포시 고촌면 김포평야의 충적충과 사면퇴적충에서 퇴적상 분석 및 화분 분석을 실시하여 식생환경, 해면변동, 기후변화와 같은 자연환경인화를 검토하고 이것을 선사시대 인간활동과의 관계에서 살펴보았다. 최종빙기 이래 형성된 연구지역의 퇴적상은 빙기의 선상지성사면퇴적층과 흘로세 충적충으로 구분되며, 화분분석은 흘로세 충적충의 유기질이 다소 포함된 회색실트충, 분해되지 않은 토탄충, 분해된 토탄충에서 이루어졌다. 화분조성은 흘로세 중기 이후 해면미변동을 반영하며, 화분대GP-Ⅰ은 흘로세 해진의 영향으로 수심이 있는 저습지 환경에서 Alnus를 중심으로 한 목본 우점기에 퇴적되었고, 화분대GP-ll시기는 해면의 지속적인 정체와 하강에 따른 지하수위 저하 그리고 활발해진 인간활동의 영향으로 목본이 크게 줄고, 포자와 초본류가 우점하게 되었다. The environmental change such as vegetation environment, sea-level change, climate change and human impact was restored at Gimpo alluvial plain on the upper Han river according to the results of sedimentary facies and pollen analysis. The sedimentary facies which has been constructed since the last glacial stage is composed of the hillslope deposits as the alluvial fan during the glacial stage and Holocene alluvium. Materials for pollen analyses were sampled from gray organic silt layer, peat I layer(abundant fibroid material included the branches of trees and roots of grasses) and peat Ⅱ layer(decomposed peat including organic clay) in the alluvium of the Holocene. The change of the pollen composition reflected sea-level change and vegetation environment during the Holocene. Pollen zone GP-Ⅰ was the period of AP-dominance, including mostly Alnus. Study area was under the lagoon or swamp environment influenced by Flandrian transgression. Pollenzone Ⅱ was the period of Spore & NAP-dominance. It represents that vegetation environment was changed to drier condition by falling the surface of ground-water caused by sea-level regression after long-term stability, and influenced of human activity.

효소와 기계적 전처리에 의한 슬러지 저감에 관한 연구

환선진,김상철,장현섭 경희대학교 2004 環境硏究 論文集 Vol.13 No.-

The effective removal of sewage sludge is very wmportant, due to a lot of generation, environmental hai mful effects. This study was carried out to be effective pretreatment of cell rupture. The purpose of sludge pretreatment in this study was that microorganism cell walls of sewage sludge were ruptured by biochemical and mechanical treatment for sewage sludge reduction. the soluble chemical oxygen demand and solubility of sewage sludge gradually were increased with SDS, lysozyme and EDTA dose. Also treatment of combined lysozyme with SDS or EDTA more increase of SCOD concentration than singy' treatment method. The sludge cells and floc were disrupted by homogenizer and biochemical pretreatment resulting in the increase of SCOD concentration and microscopic observation. We have observed that higher solubility of sewage sludge cloud be obtained through pretreatment of combination homogenizer with enzyme.

제주도 고등학교 학생들의 비만 유병률과 심혈과 위험인자

황승욱,김현주,홍성철,이상이 제주대학교 생명과학연구소 2002 제주생명과학연구 Vol.5 No.6

연구배경 : 최근 청소년 연령층의 비만이 급격히 증가하고 있으며, 비만 청소년들에 있어서 고혈압, 당뇨, 고지혈증이 조기에 발현될 뿐 아니라 성인비만과 성인병 발생의 주 원인이 되고 있다. 본 연구는 제주도내 고등학생들의 비만 유병률과 청소년 비만과 심혈간 위험인자인 혈압, 총콜레스테롤, 공복시혈당의 관련성을 알아보고 소아비만과 청소년 비만의 관련성을 조사하였다. 방법 : 연구대상은 제주도내 22개 고등학생 1학년 6,064명을 대상으로 하였고. 체격조사는1999년도 학교 신체검사 자료와 병원 건강검진 자료를 이용하였다. 비만에 대한 평가는 대한소아과학회에서 발행한 1998년도 한국소아표준치와 체질량 지수 두가지를 이용하였다 심혈관 위험인자로는 총콜레스테롤 수축기 혈압, 이완기혈압 공복시 혈당으로 하였으며, 배상자중 646명에 대해 과거 건강기록부를 열람하여 초등학생 때의 비만실태를 조사하였다. 결과 : 제주도 고등학생의 비만 유병률은 표준체중에 의한 비만 산출법으로는 남, 여학생 각각 12.6%, 13.3%이었고 체질량 지수에 의한 비만 위험군 및 비만 학생이 남, 녀 각각 12.7%, 13.4%로 나타났다. 지역에 따른 비만 유병률은 남학생의 경우 시 지역 12.9%, 군 지역 10.3%로 시 시역에서 비만 유병률이 유의하게 높았으며, 여학생의 경우 시·군지역 각각 12.9%, 14.2%이었으나 통계적 유의성은 없었다. 고등하교 계열에 따른 비만 유병률은 남학생의 경우 인문계 13.9%, 실업계 10.1%로 인문계가 유의하게 높았으나, 여학생의 경우는 통계적 유의성은 없었다. 비만 정도에 따른 심혈관 위험인자와의 관련성에서 남학생의 경우 수축기와 이완기혈압, 공복시혈당, 총콜레스테롤 수치가 비만 정도에 따라 유의한 차이를 보였으며(P<0.05), 여학생의 경우 공복시혈당을 제외한 나머지 변수에서 유의한 차이를 보였다. 체질량지수와 심혈간 위험인자간의 상관관계에서 남학생은 혈압, 공복시혈당 총콜레스테롤이 유의한 양의 상관관계를 보였으며, 여학생의 경우 공복시혈당 외에 다른 수치에서 유의한 양의 상관관계를 보였다. 연구대상자 중 646명에 대해 초등학교 1학넌 때의 비만실태를 추적한 결과 초등학생 비만이 고등학생 비만에 미치는 비교위험도가 남녀 각각 3.77, 2.16으로 유의하게 나타났다(P<0.05). 결론 : 제주도지역 고등학생들의 비만 유병률이 상당히 높게 나타났고, 청소년 비만과 심혈관 위험인자간의 관련성을 알 수 있었다. 또한 소아비만이 청소년 비만으로 상당수 이행되었으므로 소아 및 청소년기에 적절한 비만관리 프로그램이 요구된다. Background: Recently, adolescent obesity was increased and tended to become obese adults, facing increased risk for diabetes, cardiovascular disease. Even vefore reaching adulthood, adolescent, obesity already was experiencing hypertension, dyslipidemia, and diabetes mellitus. The purpose of this study was to find prevalence of obesity of high school students in Jeju island and association between obesity and cardiovascular risk factors and association between childhood obesity and adolescent obesity. Method: The study subjects were 6,064 students of twenty-two high school in Jeju island and health survey data was gathered from high school health examination data and hospital health examination data from Aug. 1999 to Dec. 1999. Adolescent obesity was evaluated by ideal body weight method in 1998 and body mass index. Cardiovascular risk factors were checked total cholesterol, systolic and diastolic blood pressure, fasting blood sugar. In 646 students, obesity at primary school is checked by primary school health record. Results: Prevalence of obesity in Jeju island high school students was 12.6% in male students, 13.3% in female students by ideal body weight method and Prevalence of obesity risk and obesity was 12.7% in male students, 13.4% in female student by body mass index. Prevalence of obesity of male students in city area and district area of Jeju island were each 12.9%, 10.3% and that of male students in city area was significantly higher. Prevalence of obesity of female students in city area and district area of Jeju island were each 12.9%, 10.3% and that of male students in city area was significantly higher. Prevalence of obesity of female students in city area and district area of Jeju island were each 12.9%, 14.2% and not significantly different. Prevalence of obesity of male students in general and commercial school group were each 13.9%, 10.1% and that of general school group was significantly higher. In female students, Prevalence of obesity general and commercial school group was not significantly different. Total cholesterol, systolic and diastolic blood pressure were significantly associated with degree of obesity in male and female students(P<0.05) and fasting blood sugar was only significantly associated with degree of obesity in male students (P<0.05). In 646students, Relative risk of obesity at primary school and that at high school in male and female students were 3.77, 2.66 and was significantly associated. Conclusion: Prevalence of obesity of high school students in Jeju island is very high and adolescent obesity was significantly associated with cardiovascular risk factors. Mostly childhood obesity tended to become adolescent obesity and program of control of obesity at childhood and adolescence is required.

몬테 카를로 시뮬레이션에 의한 In_(0.53)(Al_(x)Ga_(l-x))_(0.47)As의 전자 및 정공의 전송에 대한 해석

황성범,김용성,함창현 慶南專門大學 1997 論文集 Vol.25 No.1