반성코크스를 이용한 무점결재의 탄소성형체 제조

김제영,이성영,최재훈,김철우,박양덕 ( Je Young Kim,Seong Young Lee,Jae Hoon Choi,Chol Woo Kim,Yang Duk Park ) 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.5

The properties of carbon solid prepared from semi-coke powder without using a binder were examined on both the moulding pressures and the calcining temperatures. Up to 1500 ㎏/㎠, the pressure effect on the carbon solid changed characteristically high. The highest compressive strength was obtained on carbon solid calcined at 1200 ℃, and its density was 1.6g/㎤.

만성 두통에 대한 뇌청혈해독탕의 임상적 효과

김제영 ( Jae Young Kim ),이시섭 ( Si Sup Lee ),유정석 ( Jung Suk Yu ),송범용 ( Beom Yong Song ),김락형 ( Lak Hyung Kim ),육태한 ( Tae Han Yook ) 대한한방신경정신과학회 2007 동의신경정신과학회지 Vol.18 No.1

Objective : Chronic headache is the most common headache. The objective of this study is to find the clinical manifestation of chronic headache and has been carried out to investigate the effects of Noechongyolhaedok-tang on the chronic headache.Method : This observation was carried out on 73 patients with chronic headache. They were applied to Noechongyolhaedok-tang and the degree of improvement of chronic headache was evaluated by VAS. Results : 1. Distribution of study population by sex, age : male : female = 1 : 3, 30s-50s group = 81% Duration of onset : over 10years = 48% Reported site of chronic headache : the whole = 28% Clinical pain characteristics : be torn = 25% Frequency of headache : everyday = 72% Time of attack : irregular = 52% 2. In VAS scores, there were significant differences between before and after Noechongyolhaedok-tang treatment. There were no differences between before and after treatment in each sex and the duration of onset Conclusion : The effectiveness of Noechongyolhaedok-tang on the chronic headache was shown through VAS Further study is needed about Noechongyolhaedok-tang.

다운증후군 아동의 전정 및 시각 기능이상

이계영 ( Gae Young Lee ),김제영 ( Jey Young Kim ),한재덕 ( Jae Duk Han ),한동기 ( Dong Ki Han ),김기영 ( Gi Young Kim ) 한국특수체육학회 2005 한국특수체육학회지 Vol.13 No.4

멀티 외기냉방을 이용한 데이터센터의 에너지절약 시스템 개발에 대한 연구

김제영(Kim, Je-Young),장현재(Chang, Hyun-Jae),정용호(Jung, Yong-Ho) 대한건축학회 2014 대한건축학회 학술발표대회 논문집 Vol.34 No.2

서버 컴퓨터의 발열량이 변화한 경우의 데이터센터 내의 기류 및 온도분포 특성에 대한 연구

장현재(Hyun-Jae Chang),김제영(Je-Young Kim) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.3

On a large scale of data center, heat generation rates from sever computers occupy almost the entire cooling load of the building, and it is gradually increasing. The efficiency of air distribution system in data centers can be affected by heat generation rates of server computers. In this study, the distributions of airflow and temperature in a data center have been investigated by CFD simulations under various conditions of heat generation rates for server computers. From the results, air around the cold aisle which has high temperature flows tremendously into the cold aisle according to the increase of heat generation rates for server computers and the air temperature in the cold aisle becomes higher. The SHI (supply heat index) and RHI (return temperature index) show almost similar values to the cases study because the air inflow rates to server computers increase with the heat generation rates of server computers.

코크스 시험로에서 석탄 건류시 석탄 팽창압 거동 특성

김제영,이운재 한국화학공학회 1998 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.36 No.4

콜타르로부터 Pitch Coke 제조에 대한 원료와 탄화조건의 영향

박양덕,김제영,최재훈,이규동 한국화학공학회 1990 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.28 No.5

콜타르로부터 양질의 핏치코크스 제조조건을 설정하기 위하여 원료콜타르의 특성, 용매추출에 의한 정제효과, 열처리온도 및 시간변화에 따른 생성코크스의 이방성조직과 열팽창계수 등을 비교하였다. 원료콜타르의 C/H비는 1.08-1.45로서 상당히 높은 값을 나타내고 있었으며 이러한 경향은 용매추출 및 적외선분광분석 결과와도 일치하였다. 원료콜타르로부터 제조된 코크스는 모자이크 조직을 보였으나 정제콜타르로 제조된 코크스는 "Flow-domain" 형태로 발달된 이방성조직을 보임으로써 정제에 의한 코크스조직 개선효과가 현저하였다. 또한 가압하에서 코크스화에 필요한 시간은 반응온도 550℃에서는 45분이었으나 430℃에서는 5시간 이상의 장시간이 소요되었다. 450℃에서 열처리한 경우 전체적으로 생성코크스의 수율은 높았으나 코크스의 열팽창계수가 높은 단점을 보였으며, 550℃에서는 탄화수율 감소 및 생성코크스의 조직저하가 야기되었다. 그러나 470℃에서는 이방성 조직배향이 발달되고 열팽창계수가 낮은 코크스가 비교적 높은 수율로 제조되었다. 그러므로 콜타르로부터 핏치코크스 제조시, 생성코크스의 수율, 이방성 조직과 열팽창계수의 비교결과, 열처리 온도가 중요한 제조인자로 작용하고 있음을 알 수 있었으며 본 시료에서는 콜타르의 특성에 따라 470℃와 500℃의 온도영역에서 양질의 핏치코크스를 제조할 수 있었다. Coal tars have been used as feedstocks in order to find guiding principles for the preparation of the high quality pitch cokes. It was compared that the carbonization behavior and the properties of raw coal tars; CTE(Coefficient of Thermal Expansion) values and microtexture of cokes prepared from refined coal tars were also compared. The values of C/H atomic ratio of raw coal tars showed 1.08-1.45. By the refining raw coal tars with solvent extraction method, the anisotropic texture development of pitch cokes has been considerably improved. This coke showed "Flow-domain" texture against mosaic texture from raw coal tar. Coal tar was converted into coke for 45 min at 550℃ but it took more than 5 hours at 430℃. At 450℃ coking yields and CTE value of cokes were higher than any other temperature. Coking yields were decreased and the textures of coke were mosaic at 550℃. Pitch cokes prepared at 470℃ have high coking yield; well-developed anisotropic texture, and low CTE. In conclusion, heat treatment temperature, on preparing pitch coke from coal tar, was an important factor as indicating comparison of coking yields, microtextures, and CTE values. By property of coal tars, good quality of pitch coke can be prepared at 470℃ and 500℃ with coal tar used.

석탄건류시 장입탄의 입도분포가 코크스 강도에 미치는 영향

강석호,김제영,유은재,류필조 한국화학공학회 1986 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.24 No.5

이론적으로 유도된 코크스강도와 코크스화성의 수학적 관계식: S=S+k₁ ∂²S/∂((MF)￣)²ΣF_i{((MF)￣)-(MF_i)}²P_i에서 H=ΣF_i((MF)￣-MF_i)²P_i라 두면, H의 값을 원료탄의 입도분포 조정에 의해 최소화함으로써 코크스강도를 향상시킬 수 있음을 알 수 있다. 이 이론을 기초로 장입탄의 입도조정에 의한 새로운 코크스 강도향상 방법이 제안되었다. 실제로 H값을 줄이도록 입도조정된 장입탄으로부터 제조된 코크스의 강도시험을 통하여 제안된 방법의 타당성이 입증되었다. In order to improve the coke strength resulting from the coke manufacturing process of the bituminous coals, the particle size distribution and blending ratios of the various raw coals having different coking strengths were adjusted before charging the blended sample coals into cokes oven. The average strength, S￣, of the sample cokes produced can be improved by adjusting the mixing ratio of the charging coal, Fi, and coarser fraction, Pi, retained on the 3 ㎜ sieve screen, as weil as the maximum fluidities, MFs, of the various raw coals blended in. The coke strength could be improved by maintaining the term, H=ΣF_i((MF)￣-MF_i)²·P_i to the minimum value, as far as possible in practice.

열처리에 의한 탄소질 메조페이스의 생성속도

이보성,유승곤,김제영,최재훈 한국화학공학회 1989 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.27 No.1

410℃-450℃의 온도범위에서 여러 시간 열처리하였을 때, 생성되는 퀴놀린 불용분과 메조페이스에 관하여 용매추출, 편광현미경, 주사형 전자현미경을 이용하여 조사하였다. 지금까지 알려진 것과는 달리 퀴놀린 불용분과 메조페이스는 동일 물질이 아니었으며, 열처리 초기에는 퀴놀린 불용분이 메조페이스 보다 빨리 생성되었으며, 후기에는 메조페이스의 생성이 더 빨랐다. 퀴놀린 불용분과 메조페이스 생성속도는 1차식에 잘 맞았으며, 활성화에너지는 각각 36.6Kca1/mole과 58.5Kcal/mole이었다. 휘발분 함량과 C/H비는 메조페이스의 핵생성 단계에서 큰 변화를 보였으며, 합체 과정에서는 변화가 크지 않았다. Formation of quinoline insoluble and mesophase obtained from coal tar pitch by heat treatment in the temperature range from 410℃ to 450℃ for various times have been studied, using solvent extraction, polarized microscope and SEM. Content of quinoline insoluble and mesophase were not equal to each other, contrary to the facts known by this time. At an early stage of heat treatment, the rate of formation of quinoline insoluble was greater than that of mesophase, and there were some isotropic secondary quinoline insoluble. At a later stage, the rate of formation of mesophase was greater than that of quinoline insoluble. The rates of formation of quinoline insoluble and mesophase were well fitted with 1st order reaction and activation energies of those were 36.6 Kcal/mole and 58.5 Kcal/mole, respectively. Content of volatile matter and C/H ratio were changed remarkably during nucleation of mesophase, but changed little during coalescence of mesophase.

공기분위기하에서의 석탄타르핏치의 열처리

이성영,박양덕,김제영,최재훈 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1

석탄타르핏치를 350-400℃의 온도에서 180분까지 공기분위기하에서 열처리하여 생성된 핏치의 용해도, 원소분석, 광학적 조직 등을 조사하였다. 각 열처리 온도에서 열처리 시간이 90분 이상에서는 용해도와 C/H 비는 거의 일정하였으며, 동일 처리 시간에서는 열처리 온도가 높을수록 톨루엔 불용분 및 C/H비가 높았다. 이 온도영역에서 메조페이스는 생성되지 않았으며 광학적 조직은 톨루엔 불용분이 20wt% 이상, C/H비가 1.7이상일 때 잠재적 이방성 특성을 나타내었나. 또한 위의 시료는 결합재를 사용하지 않고 탄소성형체를 제조할 수 있는 원료로 이용할 수 있었다. Coal tar pitch was heat treated in the temperature range of 350-400℃ under air blowing conditions and their properties such as solubility, C/H ratio, and optical texture were characterized. Solubility and C/H ratio were not varied by the heat treatment time over 90 min at each heat treatment temperature and higher toluene insoluble fraction and C/H ratio were obtained as heat treatment temperature increased at the given treatment time. The heat treated pitch had the dormant mesophase property when the toluene insoluble fraction was higher than 20 wt% and C/H ratio higher than 1.7. Preparation of carbon solids without a binder could be achieved using these pitches.