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페놀계 고농도 붕산염 난연제처리 파티클보드의 물리·기계적 성능
최병훈 ( Byeong-hoon Choi ),구영모 ( Yeong-mo Koo ),강석구 ( Seog-goo Kang ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
This study was conducted to analyze the effect of phenolic high solidity borate flame retardant on the physical and mechanical properties of particle boards. The flame retardant was applied as 3, 7, 11 and 15% of the total dry weight of the particles, respectively. The resin content was 12%, and the target density was set at 0.7g/㎤. In order to verify the physical and mechanical properties of the particle board, an experiment was conducted according to KS F 3104. In addition, in order to evaluate the performance of the flame-retardant, a test using a 45° meckel burner was performed in accordance with KS F 2819. Results show that the flame- retardant performance increased as the amount of treatment increased, and all of the treated materials passed the flame-retardant performance standards of the fire department. Physical and mechanical properties increased with treatment rate up to 7%, and decreased at higher treatment rates. Therefore, the most appropriate treatment was determined to be 7%. The properties of the particle board manufacturednin the laboratory have been verified, and it is decided that it is necessary to study the product applied to the production process.
국산 침엽수 5수종의 페놀계 고농도 붕산염 난연제 주입에 따른 연소특성 평가
구영모 ( Yeong-mo Koo ),최병훈 ( Byeong-hoon Choi ),강석구 ( Seog-goo Kang ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
This study compared the combustion characteristics of phenolic high-solidity poly-borate fire-retardant for five domestic species of softwood. The five domestic softwoods are Larix kaempferi Carrie (A), Pinus densiflora (B), Chamaecyparis obtuse (C), Abies holophylla (D), and Cryptomeria japonica (E). The prepared specimens were pressure-impregnated with a fire retardant for 1hr under the conditions of 13 bar and 70℃, and then the weight reduction rate according to the injection rate (WPG) for each species and the external radiant heat source (50 kW/㎡) was evaluated. The specific gravities of the five species were highest in the order of A > B> C > D > E. The injection rate (WPG), determined according to the porosity of wood and the difference between the early and late wood, was found to be inversely proportional to the specific gravity. In the 50 kW/㎡ radiant heat source, weight reduction by treatment with phenolic high-solidity poly-borate fire-retardant was the order of E > B > C > D > A. It is expected that there would be a delay effect on the spread of fire when injected wood was applied as a building material. Through this study, it is decided that it will be possible to contribute to increasing the utilization of domestic softwood and improving the fire safety through the development and commercialization of injection wood flame retardants and chemical treatment methods.
버섯 폐배지의 연료화 및 품질개선을 위한 반탄화 최적화 연구
이창구 ( Chang-goo Lee ),최병훈 ( Byeong-hoon Choi ),구영모 ( Yeong-mo Koo ),강석구 ( Seog-goo Kang ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.2
This study was conducted as part of the purpose of realizing the fuelization and quality improvement using spent mushroom substrate through a torrefaction pretreatment. Conditions of torrefaction pretreatment were performed at temperatures of 250, 350, and 450°C and reaction times of 600, 1,200, and 1,800s, respectively. In order to confirm the fuel characteristics were conducted to proximate analysis and higher heating value. As the experimental materials, to determine the tendency of spent mushroom substrate according to the cultivation period of Letinula edodes, the products discarded after harvesting 2, 4, 6 and 8 cycles were used. As a result, higher heating value and content of fixed carbon has been increased and contents of moisture content and ash has been decreased the more torrefaction pretreatment for temperature and time increased. Furthermore, the results of calculating the energy yield through the higher heating value and the mass yield, it found that most suitable for molded charcoal of the manufacturing a conditions of 1,200-1,800s of 350°C in this study.
음성증상 정신분열병 환자에서 Haloperidol 단독치료와 Carbamazepine과 Haloperidol, Valproic acid와 Haloperidol 병합치료간의 비교
최병훈,김승현,이민수 大韓神經精神醫學會 1996 신경정신의학 Vol.35 No.3
연구목적 : 음성증상이 우세한 만성 정신분열병 환자를 대상으로 향정신병약물인 haloperidol에 항경련제인 carbamazepine과 valproic acid를 각각 병합투여하여 haloperidol 단독투여와 임상적 효과를 비교하였다. 연구방법 : Haloperidol을 고정용량으로 투여 중인 45명의 음성증상 정신분열병 환자를 무작위로 각각 15명씩, carbamazepine과 haloperidol 병합군, valproic acid와 haloperidol 병합군, 그리고 haloperidol 단독군의 세군으로 나누어 투여하였다. 이중 5명이 자의퇴원과 부작용때문에 연구로부터 탈락되어, 총 40명이 연구를 완료했다. 모든 대상환자는 연구시작시, 2주째와 4주째 각각 BPRS와 PANSS 음성척도로 증상을 평가하였다. 연구결과 : 전체 BPRS 척도 점수, 음성증상을 나타내는 BPRS 세 척도 각각의 점수와 이들 세 척도 점수의 합이 세 군에서 매 시점간의 점수의 차이는 없었으며 각 군에서 시점의 변화에 따른 점수의 유의한 차이가 없었다. PANSS 음성척도 점수도 세 군에서 매 시점간의 점수의 차이는 없었으며 각 군에서 시점의 변화에 따른 점수의 유의한 차이가 없었다. 결 론 : 음성증상 정신분열병에서 항정신병약물인 haloperidol과 항경련제인 carbamazepine 혹은 valproic acid 각각 의 병합투여는 haloperidol 단독투여에 비해 음성증상에 효과적이지 못했으며 향후, 질병기간이 상대적으로 짧은 환자들을 대상으로 좀 더 긴 병합치료 기간의 연구가 필요하다고 사료된다. The purpose of this study was to compare the clinical effects of carbamazepine and haloperidol vs valproic acid and haloperidol vs haloperidol alone in negative symptom schizophrenia. The subjects of this study consisted of 45 patients with chronic schizophrenia according to DSM-Ⅲ-R criteria and had predominant negative symptoms evaluated by PANSS. The subjects were divided into 3 groups randomly. Group A was treated with fixed dose of haloperidol combined carbamazepine up to 1000mg/day, Group B was treated with fixed dose of haloperidol combined valproic acid up to 1000mg/day and Group C was treated with haloperidol only. During the study, 4 subjects were dropped out because of severe side effects and 1 subjects was dropped out because of early discharge. The remained 40 subjects were assessed with BPRS and PANSS negative scale. There was no significant difference among the three groups in total and subscales of BPRS, and negative scale of PANSS. This result did not support that combined treatment with carbamazepine and haloperidol, and with valproic acid and haloperidol could be more effective than treatment with haloperidol alone on negative symptom schizophrenia.