Highly mesoporous activated carbon fibers using high density polyethylene precursor with a multi-step stabilization technique for automobile carbon canister

Jeong-Rae Ahn,Hye-Min Lee,Byung-Joo Kim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-

In this study, activated carbon fibers (ACFs) for automobile carbon canisters were produced usinghigh-density polyethylene (HDPE) fibers treated with a multistep stabilization process as the precursor. The stabilization of the HDPE fibers involved the following sequential steps: (1) electron beamirradiation, (2) mild sulfonation, and (3) dry oxidation. The stabilized fibers were carbonized at 900℃in a nitrogen atmosphere. The carbonized fibers were activated at 900℃ in a water–vapor atmospherefrom 30-60 min. The textural properties of the activated carbon fibers were determined using N2/77 Kadsorption–desorption isotherms. The specific surface area ranged from 1090 to 1980 m2/g, and the totalpore volume ranged from 0.56 to 1.11 cm3/g. The specific surface area, micropore volume, and mesoporevolume increased with increasing activation time. The fractions of micropores and mesopores were similaracross all conditions, whereas the yield decreased gradually until 50 min, and then exhibited a sharpdecline at 60 min. The butane working capacity increased as much as 56.24% as the increase in activationtime. This can be attributed to the increase in butane activity owing to the increase in micropore volume,along with a decrease in butane resistivity caused by the increase in mesopore volume at a specificdiameter.

허혈 유사 조건이 심방근의 활동전위 특성에 미치는 영향

김재하,주정민,조용범,신동호,안병희,주신배,김상형 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.11

직접 검화법을 이용한 조제분유의 콜레스테롤 분석법 개발

김진만,박정민,윤태형,임동길,윤창용,정자영,정인식,곽병만,안장혁,Kim, Jin-Man,Park, Jung-Min,Yoon, Tae-Hyung,Leem, Dong-Gil,Yoon, Chang-Yong,Jeong, Ja-Young,Jeong, In-Seek,Kwak, Byung-Man,Ahn, Jang-Hyuk 한국축산식품학회 2011 한국축산식품학회지 Vol.31 No.6

본 연구에서는 조제분유 중의 콜레스테롤을 신속하고 정확하게 분석하기 위해 지방 추출 과정을 거치지 않는 직접 검화 방법을 선택하여 분석법 개발을 시도하였다. 조제분유 분말시료를 직접 검화 수기에 취하여 검화 온도, 검화 시간, KOH 농도의 3가지 인자에 대해 콜레스테롤 회수율이 가장 양호하게 나타나는 최적 검화조건을 확립하고, 검화 후 수세과정에서 액액 분배가 용이한 용매 조건도 확립하였다. 또한 콜레스테롤 피크의 완전한 분리를 위한 적정 기기 조건을 확립하였다. 그 결과, 시료 약 2 g에 16 M-KOH 10 mL를 넣고 $90^{\circ}C$에서 60분 가열하여 검화한 후 diethyl ether로 3회 추출하고 hexane을 최종시험용액으로 하여 기기분석을 했을 때의 회수율이 98.80%로서 가장 양호하게 나타났다. 본 연구를 통해 개발된 조제분유의 효율적인 액액분배 및 직접가열 검화법은 일원배치 분산법에 의해 유화가공식품의 콜레스테롤 분석법으로 유효성이 검증되었으며, 아울러 개발된 전처리 방법 및 기기 분석 조건을 활용해 다양한 분석 기관에서 신속 정확하고 효율적인 콜레스테롤 분석을 수행할 수 있을 것으로 기대된다. 또한 산업체의 품질관리 및 검증기관에서 필요시 모니터링에 적극 활용 가능할 것으로 사료되며, 이를 통해 유화가공식품 류의 함량표시 및 규격관리의 정확성과 효율성 증대에 기여하여 제조업체의 정확하고도 효과적인 품질 및 안전성 확보에 기여할 수 있을 것으로 판단된다. 특히 위해 물질에 대한 정확한 함량 판단이 중요한 조제분유 등의 영 유아용 식품의 안전성 확보에 지대한 공헌을 할 수 있을 것으로 기대된다. An improved cholesterol analysis method was developed for powdered infant formula by gas chromatographic separation after liquid-liquid extraction and partition. In the official Korea Food Standard method for cholesterol analysis, the water phase and solvent phase were not well separated in the case of emulsified foods such as powdered infant formulas and baby foods. For the rapid and simple sample preparation method, an optimized direct saponification condition was established for heating temperature, heating time, and KOH concentration. From the results, the optimum conditions were as follows: heating temperature $90^{\circ}C$, heating time 60 min, and 16 M KOH 10 mL for a 2 g infant formula sample; improved separation condition for gas chromatography was as follows: the initial oven condition was $250^{\circ}C$ for 25 min, the oven temperature was increased to $290^{\circ}C$ by $10^{\circ}C$/min ratio, and finally the oven temperature remained at $290^{\circ}C$for 9 min. The developed method could be implemented for the study of cholesterol, providing the advantages of reduced inspection time and cost in emulsified foods such as infant formula.

ORDBMS를 이용한 XML 문서 저장 시스템 설계 및 구현

안병태,진민 경남대학교 정보통신연구소 2000 연구논문집 Vol.2 No.-

최근 인터넷의 발전으로 인하여 정보교환을 위한 표준으로 XML에 대한 연구가 활발히 진행되고 있다. 본 논문에서는 객체관계 데이터베이스를 이용한 XML 문서 저장 시스템 설계하고 구현하였다. 관계 데이터베이스와 객체지향 데이터베이스의 장점을 수용한 객체 관계 데이터베이스(Object-Relational Database : ORDB)를 이용하여 XML 문서 저장 모델을 설계하여 XML 문서의 구조적인 정보를 효과적으로 표현할 수 있다. XML 문서의 빈번한 수정이 용이하도록 분할저장 방식을 사용하였고, DTD에 관계없이 XML 문서를 저장할 수 있도록 DTD 독립적인 모델을 제안하였다. 또한 데이터의 중복문제를 해결함으로써 검색 속도가 향상되었다. Nowadays, the study on XML as a standard method of exchange of information is active as Internet technology develops. This thesis designs and implements XML documents storage system using object-relational database. The system takes advantage of the merits of object-oriented databases, so that the structural information of XML documents can be effectively represented. The system uses split-storage method to allow frequent modifications of XML documents and suggests DTD-independent model so that it can store XML documents without DTD. And retrieval speed is improved by solving the issue of data duplication.

新聞에 揭載된 靑少年의 自殺樣相에 關한 社會精神醫學的 硏究(1946-1980)

안일남,민병근 大韓神經精神醫學會 1981 신경정신의학 Vol.20 No.4

In order to collect the basic data concerned with the characteristic patterns of suicidal attempts and to establish preventive measures of adolescent suidides, this study was intended to examine 320 suicidal attempters among Korean adolescents, aged from 12 through 21, carried in the Dong A Il-bo from 1946 to 1980, using census method. The number of cases put into the analyses were 320 including 128 boys and 192 girls. The collected data were computerized by CDC-174 at KIST, using SPSS program and statistically analysed by Chi-square method. The results were as follows. 1. The suicidal cases were more frequent in female. The male-female ratio was 1:1.5. The peak age of frequency was 19 (21.6%). 2. Adolescent suicides were related to social change and were reported more frequently in post-war period (18.83- cases/yr.) than in other periods. 3. Adolescent suicides were related to occupational status, and were more common in those who were not students. But in the cases of male, suicides were more common among students (male 44.5%, female 37.0%) and deliquents (male 4.7%, female 1.6%) than in female significantly. 4. Suicidal rates were closely related to martial status, especially more frequent in the married group than in the non-married group in female cases. 5. Suicidal articles of adolescents were located at left-bottom, consisting of one-column articles, and it has the tendency that higher the age, the more they were located there. 6. Suicides were committed frequently in May of month, on Monday of the day of week, between 7-9 p.m. in a day. And these trends were more common in female adolescents. 7. The most frequent means employed by adolescents was drugs, and adolescents attempted suicide at home commonly. 8. The primary reasons given were emotional problems such as pessimistic attitude toward their life.

LEED를 이용한 Co/Cu(001) 초박막의 구조 연구

閔恒基,安秉男 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1

We studied the growth mode and stoichiometry of ultrathin Co film on Cu(001) single crystal surface by Auger electron spectroscopy and dynamin LEED analysis. I/V characteristics of LEED spot of ultrathin Co/Cu(001) system were obtained by video LEED system and analized by tensor LEED program and applied ATA (average t-matrix approximation). The structure and compositional variation as a function of temperature were traced. We found that a significant amount of Cu atom was segregated from the substrate to the surface of the Co film at room temperature.

Argon Laser 우각조사술을 시행한 녹내장환자의 관찰

安炳憲,閔丙武 충남대학교 의과대학 지역사회의학연구소 1985 충남의대잡지 Vol.12 No.1

Eleven phakic eyes with uncontrolled open angle glaucoma under went 180 degree argon laser trabeculoplasty (ALT) to the anterior portion of the trabecular meshwork. The mean rate of pressure reduction was 17.25% and success rate was 72.72%. The ALT caused serious complications in none of the 11 eyes. Failure was seen in secondary open angle glaucoma to angle recess and uveitis. The patients over 40 years had a success rate that was better than that in patients below 40 years. Additional ALT (2 eyes) was not effective.

2 CASES OF RABBIT SYNDROME : 토끼증후군 2례

민병근,이창화,안준호,천두욱,김헌수 울산대학교 의과대학 1994 울산의대학술지 Vol.3 No.2

The application of neuroleptics to schizophrenic and other psychotic patients in the early 1950's led to the therapeutic revolution into the psychiatry, on the other hand neuroleptic-related adverse effects did frequently occur. The authors experienced 2 cases of rabbit syndrome producing by rare complication of neuroleptic medication. Two cases were examined for the rabbit syndrome by the description of Villeneuve(1972) and Sovner and DiMascio(1977). The reciprocal coordination test and the finger-tapping technique to worsen the symptoms also were applied to two patients. The authors emphasized two issues of rabbit syndrome as follows. First, though the literature search showed that the majority of patients presented with rabbit syndrome which is usually seen after a prolonged exposure to neuroleptic medication with the more potency in the middle or elderly aged are over 45 years old, we suggest that this syndrome might be linked to the younger age factor and the low potency thioridazine in our patient. Second, the rabbit syndrome is in the importance of the clinical practice because of being readily reversible with antiparkinsonian agents or anticholinergic drugs. In addition, recognizing this condition and differentiating it from tardive dyskinesia helps in the choice of the proper treatment of orofacial disorders following neuroleptic medication for the long time.

Spreader의 종류와 Accessory cone의 적합성에 따른 근단폐쇄성에 관한 실험적 연구

안영미,최기운,민병순,최호영,박상진 慶熙大學校 齒科大學 1994 慶熙齒大論文集 Vol.16 No.1

accessory cone used in lateral condensation method. 120 plastic blocks with canal preformed were instrumented with K-H-files and Gates-Glidden bur. Shaped plastic blocks were divided into six experimental groups according to spreader and accessory cone used in lateral condensation. Then they were obturated by lateral condensation method without sealer. Six experimental groups were as follows: Group 1 Filling with #30 spreader & #25 gutta-percha cone Group 2 Filling with #30 spreader & Fine accessory cone Group 3 Filling with #3 spreader & #25 gutta-percha cone Group 4 Filling with #3 spreader & Fine accessory cone Group 5 Filling with #20,#30 spreader & #25 gutta-percha cone Group 6 Filling with #2, #3 spreader & Fine accessory cone All the blocks were stored in 100% humidor at room temperature for 2 days. Each block was placed in centrifuged for 20 minutes at 3,000 rpm Apical leakage was mesured from the apical foramen to the most coronal level of dye leakage in millimeter under a stereoscope. The data were analysed by ANOVA. The obtained results were as follows; 1: In groups using two spreaders(Group 5,6), the linear leakage was less than one spreader using groups(Group 1-4). 2. In groups using two spreaders(Group 5,6), there was no significant difference in linear leakage between standardized -spreader group and nonstandardized group (P>0.01). 3. When one spreader was used(Group 1-4), standardized-spreader groups showed less linear leakage than nonstandardized spreader groups(P<0.01). 4. In case of using same spreader(Groupl,2 & Group 3,4), there was no significant difference in linear leakage according to accessory cone type. 5. It needs to use one more spreaders to increase apical sealability.

소뇌출혈후 신경인성방광으로 배뇨장애를 주소로 한 환자 치험 1例

안정조,최영,조현경,임승민,김민상,오병렬,유병찬,설인찬 대전대학교 한방병원 2002 惠和醫學 Vol.11 No.1

In patients with Cerebral vascular accident, Voiding Dysfunction is very usual, but if with no improvement for a long time, it can cause many complexed-problems as urinarytract injury, infection or inflamation and patients suffering from pain, inconvenience and anxiety. In this case 58-year-old female with Voiding Dysfunction with Neurogenic Bladder after Cerebellum Hemorrhage, for 6 monts there was no interval change on symptom, We prescribed appropeiate herbal medication, and perform acupuncture and moxa. 5 days later after admission in Taejeon Oriental Hospital, The patien was able to have self-voiding and gradually improved. So we report it for the better treatment.