• 제목/요약/키워드: GLUE method

검색결과 96건 처리시간 0.028초

핑거접합방식에 의한 삼나무의 고주파가열 집성판 제조에 관한 연구 (1) - 삼나무 판재의 초산비닐수지 접착특성 - (Study on the manufacturing of high-frequency heating Japanese cedar laminated board by finger jointing method (1) - Gluing characteristics of Japnese cedar board by PVAc emulsion adhesives -)

  • 소원택;채정기
    • 한국가구학회지
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    • 제16권1호
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    • pp.1-8
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    • 2005
  • This experiment was carried out to investigate the gluing characteristics of poly vinyl acetate emulsion adhesive(PVAc) on the Cryptomeria japonica laminated boards. This sample trees are major planting species and have been planted in southern district for a long time. The optimum gluing conditions for laminated board were summarized as follows; the amount of spreading glue, assembly time, clamping pressure, and clamping time for PVAc resin were $200g/m^2$, 10min., $5kg/cm^2$, and 6hrs., respectively, and the relative formulae between extension ratio(x) and block shear strength(y) was $y=-9.6x+85.2(R^2=0.95)$.

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스케치 기반 메쉬 객체 결합 기법 (GluePaste : A Sketch-based mesh composition method)

  • 권지용;김나리;이인권;최윤철
    • 한국정보과학회:학술대회논문집
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    • 한국정보과학회 2008년도 한국컴퓨터종합학술대회논문집 Vol.35 No.1 (B)
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    • pp.265-270
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    • 2008
  • 본 연구에서는 스케치를 기반으로 한 3D 모델의 어셈블링 기법을 제안한다. 본 연구에서 제안하는 시스템은 Teddy 모델링 시스템[4]을 기본으로 하여, 다양하고 복잡한 형태의 오브젝트의 모델링을 보다 단순한 오브젝트들의 합성을 통해 해결한다. 제안하는 시스템은 두 개 이상의 3D 모델을 생성하는 멀티 페이지 기능을 제공하며, 두 개 이상의 메쉬를 조립하여 하나의 메쉬를 만드는 조립 모드를 제공한다. 여기에서 두 개의 메쉬를 보다 직관적이고 쉽게 조립하기 위해 스케치 기반의 객체 조합 기법을 제안한다. 제안하는 시스템을 사용하면 복잡한 형태의 오브젝트를 보다 쉽고 빠르게 제작할 수 있다.

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친환경 실내마감재 한지의 도배공정 연구 (A study on the wall finishing process with 「Han-ji」, an eco-friendly material)

  • 장명희;이연숙
    • KIEAE Journal
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    • 제9권3호
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    • pp.29-36
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    • 2009
  • Interior material covering as the final process of house-building, critically influences not only aesthetic character but also air quality of indoor space. Wall covering today, however, caused a serious social problem because of chemicals contained in the industrial wallpaper and artificial glue. In this context, Korean traditional wall covering of Han-ji can be an alternative model due to it's ecological character. Recently 'Hanok' attracts public attention, since society and people become to appreciate the unique beauty and value of our traditional culture. The values include natural beauty, emotional character, and environment-friendliness. Recognizing this, this paper intended to scrutinize the operating process of Han-ji as an interior finish material. Historical research method was employed, tracing the related articles in old literature and interviewing with the witness of the experienced expert. Thereby, healthier and unique aesthetic indoor environment can be expected to be sustainable along with the rich cultural life of ancestors.

Texture Mapping을 고려한 Rang Image의 3차원 형상 간략화 (3D Mesh Simplification from Range Image Considering Texture Mapping)

  • 공창환;김창헌
    • 한국컴퓨터그래픽스학회논문지
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    • 제3권1호
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    • pp.23-28
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    • 1997
  • 본 논문은 range map과 texture map이 포함된 range image를 삼각형 메쉬로 된 3차원 형상으로 복원하고, 이 삼각형 메쉬를 기하학적 축소 알고리즘을 적용하여 간략화하는 방법에 대하여 기술한다. 그리고 이 논문에는 복원된 3차원 모델에 texture mapping이 가능하고 간략한 정도를 사용자가 쉽게 결정할 수 있으며, 실시간 multiple level-of-detail에 적용 가능한 빠른 속도의 간략화 방법을 제시한다. 구현한 방법을 국보급 문화재를 스캐닝한 실험 데이터에 적용하여 그 유효성을 입증한다.

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합판용(合板用) 요소수지접착제(尿素樹脂接着劑)의 리조시놀 첨가(添加)에 따른 유리(遊離)포름알데히드 방산(放散) 제거효과(除去效果) (The Scavenging Effect of Resorcinol on the Formaldehyde Release from the Urea Formaldehyde Adhesive Bonded Plywood)

  • 이화형
    • Journal of the Korean Wood Science and Technology
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    • 제8권2호
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    • pp.1-5
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    • 1980
  • This study is carried out to determine the scavenging effect of resorcinol added into the urea formaldehyde resin on the formaldehyde release of plywood, as the preliminary study of using the phenolic substances. The method for formaldehyde determination used in this report is the improved chromotropic acid determination. The results are summarized as follows: 1. Resorcinol added into the urea formaldehyde adhesive acts as a good scavenger. 4 percent of resorcinol reduced the formaldehyde release to less than half content. 2. Adding resorcinol gave better glue shear strength than that of control, showing the peak of the shear strength, at 2 percent and decreased to the same strength as control along its content of 4 percent. 3. Moisture content of air dried plywood met the standard very well.

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합판용 페놀수지 접착제에 대한 TCA침전 혈액분말의 첨가효과 (Adding Effect of TCA-Precipitated Blood Powder to the Phenol Formaldehyde Resin for Plywood)

  • 이화형;이종신;장상식
    • Journal of the Korean Wood Science and Technology
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    • 제24권2호
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    • pp.15-19
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    • 1996
  • To utilize the waste materials and develope wood adhesive from isolated bloods of slaughtered cow and pig and also to prevent water pollution, simple and rapid method of isolation and purification of plasma proteins from pig bloods with trichloroacetic acid(TCA) treatment was developed. Adding of TCA-precipitated blood powder to the phenol formaldehyde resin(PF) improved dry and wet strength of plywood and resulted in fast hot pressing times.

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합판용(合板用) 고온경화형(高温硬化型) 수용성(水溶性) 요소(尿素)·페놀공축합수지(共縮合樹脂)의 성질(性質)과 그 접착강도(接着強度) (Properties and Glue Shear Strength of the Water Soluble Urea-Phenol Copolymer Adhesive as a High Temperature Curing Binder for Plywood)

  • 이화형
    • 한국산림과학회지
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    • 제60권1호
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    • pp.51-57
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    • 1983
  • 고온경화형(高温硬化型) 수용성(水溶性) 요소(尿素) 페놀공축합수지(共縮合樹脂)의 제조(製造)몰비(比)를 각각 달리 제조(製造)하고 페놀수지(樹脂)의 경우 촉매(觸媒)를 달리 제조(製造)하여 이들 접착제(接着劑)의 성질(性質)과 그 접착강도(接着強度)를 Kapur 합판제조(合板製造)를 통(通)하여 구명(究明)한 결과(結果) 다음과 같은 결론(結論)를 얻었다. 1) 각(各) 접착제(接着劑)로써 열압(熱壓)하여 제조(製造)된 합판(合板)의 비중(比重)은 단판(單板)의 비중(比重)에 따른 영향(影響)을 받아 0.67부터 0.82까지를 보였으며 합판(合板)의 기건함수율(氣乾含水率)은 모두 KS규격(規格)을 만족시켰다. 2) 상태접착력(常態接着力) 및 준내수접착력(準耐水接着力)의 경우, 페놀수지(樹脂)를 제외하고 60%고형분수지(固形分樹脂)가 50%고형분수지(固形分樹脂)보다 높은 값을 보였고 요소(尿素)와 페놀의 공축합비(共縮合比)에 따른 결과(結果)는 20%페놀함량(含量)의 요소(尿素) 폐놀공축합수비(共縮合樹脂)가 제일 높았고 70% 페놀함량(含量)의 수지(樹脂)가 제일 낮았다. 목분증량(木粉增量)은 50%페놀함량(含量) 이상(以上)의 공축합수비(共縮合樹脂)에서 접착력(接着力) 상승에 유효(有效)하였고 특히 50%고형분(固形分)의 경우, 알카리촉매 페놀수지(樹脂)를 포함하여 현저하였다. 페놀수지제법(樹脂製法) 중 양자겸용법이 최고(最高)의 접착력(接着力)을 과시하였고 알카리촉매법이 제일 낮았다. 준내수접착력(準耐水接着力)의 경우 요소수지(요소수지)는 제일 하위집단(下位集團)에 속하였다. 3) 내수접착력(耐水接着力)의 경우, 페놀수지제법(樹脂製法) 중 알카리 산(酸) 양자겸용법(兩者謙用法)을 택하는 것이 가장 좋고 알카리촉매법(觸媒法)은 반드시 목분증량(木粉增量)을 하는 것이 필요(必要)하다. 10%페놀함량(含量) 요소(尿素) 폐놀 공축합수비(共縮合樹脂)도 유효(有效)한 내수접착력(耐水接着力)을 과시하였다.

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Using scratch test to evaluate cohesive bond strength of Mo composite coating

  • Koiprasert, Hathaipat;Thaiwatthana, Sirinee;Sheppard, Panadda
    • International Journal of Advanced Culture Technology
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    • 제3권2호
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    • pp.34-41
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    • 2015
  • Bonding strength of a thermal sprayed coating is difficult to measure using a conventional pull-off test method. Scratch test is a potential alternative testing method. An adhesive and a cohesive bond strength of the coating can be measured by the pull-off test while the scratch test performed on the cross-section of the thermal sprayed coating can only demonstrate the cohesive bond strength of the coating. Nevertheless, it is still beneficial to perform the scratch testing on the cross-section of the coating for the sake of comparison thus providing an alternative to the pull-off test. The scratch test method can reduce testing time and cost in the long run due to a significant cost reduction in consumables and energy and time saving from the curing step of the glue used in the pull-off test. This research investigates the possibility of using the scratch test to measure the cohesive bond strength of Mo/NiCrBSi composite coating. The results from the pull-off test and the scratch test indicate that the cohesive bond strengths of the Mo composite coating show similar trend and that the cohesive bond strength are increased when increasing NiCrBSi content.

한국 청소년의 약물남용과 비행행위

  • 김성이
    • 한국인구학
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    • 제11권2호
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    • pp.54-66
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    • 1988
  • I. Introduction Since the 1970's drug abuse among young people has increasingly become a social problem in Korea. In the 1980's, drug abuse, especially glue sniffing, has become the cause of many unfortunated incidents resulting in harm to others as well as the abusers themselves. Taking into consideration of the seriousness of this problem, the Republic of Korea National Red Cross initiated a nation-wide research programme, to understand the present situation and to raise the level of public awareness. The goal of this research was to begin a nation - wide campaign against drug abuse. The research team was composed of the Advisary Committee members and the staff of the Youth Department of the Republic of Korea National Red Cross. The data were collected in February 1988 with the collaboration of the staff and volunteers in the local Chapters. The respondents were allocated nation-wide by the quota sampling method. The questionnaires were distributed to the respondents in three groups :2, 700 to junior and senior high school students, 605 to working youths, and 916 to delinquent youths. A total of 4, 221 questionnaires were collected. II. Characteristics of the Respondents The respondents in each group were selected evenly from rural and urban areas. The general characteristics of the respondents can be described as follow: in case of students, the proportions between male and female respondents, and between senior high school and junior high school students were almost evenly distributed. In case of working youths, the proportion of females (80.5%) was higher than those of the students and the delinquents groups. Delinquent youths were defined as those currently being under custody of the centers for juvenile delinquents. Of this number, 38.8% and 68.2% were junior and senior high school drop-outs respectively. The majority of them (92.6%) were male. As for the family background of the respondents, the proportion of those residing in poverty - stricken areas, and the proportion of those from broken families were higher in case of working youths and delinquent youths than those in case of students. III. Present Patterns of Drug Abuse The following summarizes the presents of drug abuse, as tabulated from the results of the survey. 1. Smoking The percentage of youths who smoke was 36% in the student group, 32% m the working youths group, and 94.4% in the delinquent youths group. 2. Alcohol 50.3% of students, 71.6% of working youths, and 93.3% of delinquent youths has experienced drinking alcohol beverages. 3. Tonic: non - alcoholic, caffeinated beverages popular in Korea and Japan The percentage of those who have used tonic at least once was over 90% in all of the three groups. 4. Sedative About 70% of each group has used sedative with the proportion of working youths use higher than those in other groups. 5. Stimulants Those who have used stimulants comprised around 15% in each group. 6. Tranquilizers Somewhat less than 5% of students and working youths, and 28% of delinquent youths, have used tranquilizers. 7. Hypnotics The users of hypnotics amounted to 0.4% of students, 2.6% of working youths and 7.1% of delinquent youths. 8. Marihuana Those who have used marihuana indicated 0.7% of students, 0.8% of working youths, and 13% of delinquent youths. 9. Glue-sniffing The percentage of glue-sniffing was 3.7%, 5% in the students group and in the youths group respectively, but the proportion was unusually high, at 40.7% in the delinquent youths group. From the results of the survey the present situation of drug abuse in Korea can be summarized as follows: 1. A high percentage of Korean youths have experienced smoking cigarettes and drinking alcoholic beverages. 2. Tonics (non - alcoholic, caffeinated beverages), antipyretic analgesics and stimulants quite regularly used. 3. Tranquilizers, hypnotics, marihuana and glue-sniffing are more widely used among delinquent youths than the other youths. From this fact, there exists a correlation between drug abuse and juvenile delinquency. IV. Time-series Analysis of the First Experience of Drug Abuse and Deviant Behaviour The respoundents were asked when they were first exposed to drugs and when they committed deviant acts. By calculating the average age of each experience, the following pattern was found (See Figure 1). Youths are first exposed to drugs by abuse of tonic(non - alcoholic, caffeinated beverages). At the age of 13, they amoke cigarettes, the use of antipyretic analgesics begins at 14 year old, while at the age of 15, they use tranquilizers, and at 16 hynotics. The period of drug abuse which starts from drinking caffeinated beverages and smoking cigarettes and ends in the use of hypnotics takes about three years. During this period, other delinquent behaviours begin to surface, that is, at the age of 13 when smoking cigarettes begins, the delinquent behaviour pattern starts with truancy. Next, they start taking money from others by using physical force. Prior to the age of 15, they are suspended from school, become hostile to adults, begin running away from home, and start using stimulants and alcohol. Soon they become involved even in glue-sniffing and in the use of marihuana. At the age of 15, they begin to see adult videos and carry weapons. Sexual promiscuity and usage of tranquilizers follows the viewing of adult videos. Consequently, by the time they reach the age of 16, they visit drinking establishments, and are picked up by police for committing delinquent acts. And finally, they come to use hypnotic - type drugs. From the above descriptions, drug abuse can be assumed to have a close correlation with delinquent behaviour. V. Social Factors Related to Drug Abuse As for the Korean youths, glue-sniffing is found to he related to aggressive delinquency, in such cases as run - aways, being picked up by the police, and taking money by force. Smoking cigarettes and drinking alcohol is found to be related to seeing adult videos and visiting drinking establishments. Hypnotics and marihuana were found to be representive of drugs which are related to degenerational delinquency, irrespective of social delinquency. The social factors connected with these drug abuse are as follows: 1. Individual factors Male students were more heavily involved in the usage of drug than females. Youths who do not attend church were more likely to be involved in drugs than those who attend. 2. Family factors The youths who were displeased with their mothers smoking and those who thought their parents did not love each other, or those whose parents had used drugs without prescription, were more likely to he drug users. 3. School factors Those youths who found school life boring, were unsuccessful in their studies, spend most of their time with friends, feel their teachers smoke too much, those who had a positive perception of their teachers smoking were likely to he drug users. To sum up, drug abusers depend on the influence of their parents, teachers and peers. IV. Reasons for Drug Abuse Korean students have mainly used drugs to release stress (42.8%), to stay awake (19.7%), and because of the easy accessibility of drugs( 16.6%). Other reasons are due to their ignorance of the side effects of the drugs (3.6%), natural curiosity (4.2%), and to increase strength(3.O%). From the above facts, the major reasons for drug abuse among Korean youths are to release stress and to stay awake in order to prepare exams. Furthermore, since drugs are readily available, we can conclude that drug abuse is caused by the school system(such as entrance exams) in Korea. VII. Conclusion Drug usage among Korean youths are relatively less common than those of western youths. In some cases, such as, glue-sniffing and use of stimulants, the pattern of drug abuse is found. Moreover, early drug abuse is evident, and it has a close connection with deviant behaviour, resulting in juvenile delinquency. Drug abuse cannot be attributed to any one social factor. Specifically, drug abuse depends on parents, peers, teachers and other members of the community, and also is influenced by social institutions such as the entrance exam system. Every person and organization concerned with youth must participate collectively in restraining drug abuse. Finally, it is suggested that social agencial working for youth welfare should make every effort to tackle this serious problem confronted by the Korean youths today.

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Water resources potential assessment of ungauged catchments in Lake Tana Basin, Ethiopia

  • Damtew, Getachew Tegegne;Kim, Young-Oh
    • 한국수자원학회:학술대회논문집
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    • 한국수자원학회 2015년도 학술발표회
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    • pp.217-217
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    • 2015
  • The objective of this study was mainly to evaluate the water resources potential of Lake Tana Basin (LTB) by using Soil and Water Assessment Tool (SWAT). From SWAT simulation of LTB, about 5236 km2 area of LTB is gauged watershed and the remaining 9878 km2 area is ungauged watershed. For calibration of model parameters, four gauged stations were considered namely: Gilgel Abay, Gummera, Rib, and Megech. The SWAT-CUP built-in techniques, particle swarm optimization (PSO) and generalized likelihood uncertainty estimation (GLUE) method was used for calibration of model parameters and PSO method were selected for the study based on its performance results in four gauging stations. However the level of sensitivity of flow parameters differ from catchment to catchment, the curve number (CN2) has been found the most sensitive parameters in all gauged catchments. To facilitate the transfer of data from gauged catchments to ungauged catchments, clustering of hydrologic response units (HRUs) were done based on physical similarity measured between gauged and ungauged catchment attributes. From SWAT land use/ soil use/slope reclassification of LTB, a total of 142 HRUs were identified and these HRUs are clustered in to 39 similar hydrologic groups. In order to transfer the optimized model parameters from gauged to ungauged catchments based on these clustered hydrologic groups, this study evaluates three parameter transfer schemes: parameters transfer based on homogeneous regions (PT-I), parameter transfer based on global averaging (PT-II), and parameter transfer by considering Gilgel Abay catchment as a representative catchment (PT-III) since its model performance values are better than the other three gauged catchments. The performance of these parameter transfer approach was evaluated based on values of Nash-Sutcliffe efficiency (NSE) and coefficient of determination (R2). The computed NSE values was found to be 0.71, 0.58, and 0.31 for PT-I, PT-II and PT-III respectively and the computed R2 values was found to be 0.93, 0.82, and 0.95 for PT-I, PT-II, and PT-III respectively. Based on the performance evaluation criteria, PT-I were selected for modelling ungauged catchments by transferring optimized model parameters from gauged catchment. From the model result, yearly average stream flow for all homogeneous regions was found 29.54 m3/s, 112.92 m3/s, and 130.10 m3/s for time period (1989 - 2005) for region-I, region-II, and region-III respectively.

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