파라핀 왁스 처리 목재의 치수안정성

이종신,김진경,이종신,박순,손기혁,윤선미 한국가구학회 2022 한국가구학회지 Vol.33 No.1

As a result of comparing the dimensional stability and water droplet contact angle of paraffin wax-treated wood with the conventional treatment technique, the heat replacement method, and the new technique, the pressure-vacuum method, the following conclusions were obtained. When treated with paraffin wax, radiata pine shows superior Reduction in water absorptivity (RWA) and Moisture excluding efficiency (MEE) compared to hard maple. The effect of paraffin wax treatment on Anti-swelling efficiency (ASE) and Anti-shrinkage efficiency (ASE), which are the criteria for dimensional stability evaluation, is higher in hard maple than in radiata pine. In the paraffin wax treatment, the pressure-vacuum method can obtain higher dimensional stability compared to the heat replacement method. A large droplet contact angle was formed on the surface of the pressure-vacuum wax treated wood. A relatively smooth wax layer was formed on the surface of the pressure-vacuum treated wood compared to the heat-replacement treated wood.

파라핀 왁스 처리 목재의 조직 내 왁스 분포 상태

이종신,이종신,김진경,박순,손기혁,윤선미 한국가구학회 2021 한국가구학회지 Vol.32 No.4

After paraffin wax treatment with different wood species and treatment methods, the differences in the weight percent gain density and wax distribution of treated wood were investigated, and the following conclusions were obtained. Paraffin wax penetrates low-density wood better than high-density wood, and thus the weight and density of treated wood are greatly increased. The lumen of the cells of the wood treated with the heat replacement method in which the water in the wood is replaced with paraffin wax is filled with wax, which greatly affects the weight and density increase of the treated wood. After pressure treatment with paraffin wax, the decompressed wood leaves no wax in the cell lumen. It shows a thin coating pattern only on the cell lumen wall. Accordingly, the increase in weight and density is small compared to heat replacement treated wood.

목재 난연제의 농도와 전기전도도의 관계

이종신,이종신,황원중,윤새민,김진경 한국가구학회 2020 한국가구학회지 Vol.31 No.4

The relationship between the concentration of wood flame retardant and electrical conductivity, and the effects of wood extract and water types on electrical conductivity were investigated. As the concentration of the flame retardant solution increased, the electrical conductivity increased, showing a positive correlation, and a high degree of significance was recognized. It was found that the cold water extract of wood did not significantly affect the electrical conductivity of the wood flame retardant solution, but an additional review is needed considering the field environment of the wood flame retardant treatment industry. When ground water is used to prepare flame retardant solution, the electrical conductivity of the solution increases more than twice as compared to tap water, but there is a positive correlation between the concentration and the electrical conductivity, showing high significance.

Salicylate가 척수 운동신경세포의 운동반사에 미치는 영향

이종신,한희철,홍승길 고려대학교 의과대학 1986 고려대 의대 잡지 Vol.23 No.1

Pain producing substances, such as bradykinin and potassium, were introduced into the skeletal muscle and the changes of impulse discharges from flexor gamma motoneurons of the spinal cord were studied whether they are influenced by ASA or not. The obtained results are summarized as follows: 1. When 5mg and 50mg of ASX were injected into the gastrocnemius-soleus muscle through the artery, resting impulse discharges from flexor gamma motoneurons diminished gradually and they were recovered after 30 minutes in case of 5mg ASA and after 1 hour in case of 30mg ASA. 2. After introducing 5mg of ASX, bradykinin was injected with intervals of 3 min. The frequency of impulse discharge from flexor gamma motoneuron was diminished. This was recovered to normal after 21 min. Also, ASA prolonged the latency of response induced by bradykinin. 3. After introducing 5mg of ASA, potassium was injected with 3 minute intervals. The frequency of impulse discharge from flexor gamma motoneuron was increased. This was recovered to normal after 30 min. Also, ASA increased the duration of increased impulse discharge induced by potassium but ASA prolonged the latency of reponse induced by potassium. 4. After introducing 5mg of ASA, potassium was injected in 3 minute intervals. The frequency of impulse discharge from extensor gamma motoneuron was inhibited. And this inhibition was greater than when ASA injected. The inhibition was recovered to normal after 30 min. Also, ASA prologed the latency of response induced by potassium. 5. After introducing 50mg of ASA intravenously, bradykinin was injected with intervals of 3 min. The frequency of impulse discharge from flexor gamma motoneuron was prolonged by this treatment. In case of potassium with same dose of ASA, it revealed that the frequency of impulse discharge, the duration and the latency of response were all increased. To summarize the above results, it seems that ASA has the prominent inhibiting effects on the pain induced by bradykinin, while it has no strong analgesic effect on the pain induced by potassium.

Monoethylene Glycol 계 수지액을 주입한 소나무재에 있어서 수지성분의 분포와 방부효과

이종신 한국목재공학회 1995 목재공학 Vol.23 No.2

With the aim to utilize pine wood(Pinus densiflora Sieb. et Zucc.) as an interior building materials, such as flooring material, monoethylene glycol(MEG) resin solution was impregnated into greenwood. Specimens of three different qualities, that is, normal wood, resinous wood and compression wood, were prepared. Distribution of resin element(phosphorus) in MEG resin solution-impregnated woods and preservative effectiveness against brown rot fungi(Tyromyces palustris and Serpuia tacrymans) of these woods were investigated. The results were as follows: 1. The concentration of phosphorus into cell walls of resinous wood and compression wood was lower compared to that of normal wood. This shows that the quality of wood has an influence on the penetration of MEG resin solution into the wood, It was shown from a leaching test that MEG resin could be leached out easily from the cell walls. 2. The resinous wood and compression wood, even without MEG resin solution impregnation had high decay resistance. For normal wood, significant improvement of preservative effectiveness was observed after impregnation of MEG resin solution. It was shown that MEG resin was leached out from the woods after leaching test, resulting in the reduction of preservative effectiveness. From this result, suitability of MEG resin solution-impregnated woods as an interior materials was recognized.

A Compensation Control Method Using Neural Network for Mechanical Deflection Error in SCARA Robot with Random Payload

이종신 한국기계기술학회 2011 한국기계기술학회지 Vol.13 No.3

This study proposes the compensation method for the mechanical deflection error of a SCARA robot. While most studies on the related subject have dealt with the development of a control algorithm for improvement of robot accuracy, this study presents the control method reflecting the mechanical deflection error which is predicted in advance. The deflection at the end of the gripper of SCARA robot is caused by the self-weights and payloads of Arm 1, Arm 2 and quill. If the deflection is constant even though robot’s posture and payload vary, there may not be a big problem on robot accuracy because repetitive accuracy, that is relative accuracy, is more important than absolute accuracy in robot. The deflection in the end of the gripper varies as robot’s posture and payload change. That’s why the moments M_x , M_y and M_z working on every joint of a robot vary with robot’s posture and payload size. This study suggests the compensation method which predicts the deflection in advance with the variations in robot’s posture and payload using neural network. To do this, I chose the posture of robot and the payloads at random, found the deflections by the FEM analysis, and then on the basis of this data, made compensation possible by predicting deflections in advance successively with the variations in robot’s posture and payload through neural network learning

6축 수직다관절 로봇의 최적화 설계 ( Optimal Design of 6 Axes Articulated Robot Manipulator )

이종신,김태기,이신호,이만동 대한기계학회 1994 대한기계학회 춘추학술대회 Vol.- No.-

표고 재배 중 톱밥 배지의 물리적 성질과 목재 화학성분 변화

이종신,강석구,양승민,김진경 한국균학회 2022 韓國菌學會誌 Vol.50 No.4

In this study, the physical properties of the medium and changes in the wood chemical composition of the sawdust were investigated during the cultivation of oak mushroom sawdust bags, and the following results were obtained. After inoculation, the weight of the medium decreased during the incubation period. It is determined that this is not due to evaporation of moisture containing the medium or decomposition of sawdust, but to decomposition of rice bran, a low molecular substance added to the medium. It was confirmed that the moisture content of the medium was steadily increased during incubation, and it was estimated that the organic substrates such as rice brane in the medium was decomposed by mycelium, and water, one of the decomposition products of organic substrates, caused an increase in the moisture content of the medium. Along with the increase in the harvest of oak mushrooms, the proportion of organic substances such as holocellulose and lignin, the main components of the wood cell wall of sawdust, steadily decreased. In particular, the degradation characteristics of the wood cell wall component of shiitake, which is a white rot fungi, were confirmed by higher lignin reduction rate than that of holocellulose. On the other hand, ash, which is an inorganic material, increased with an increase in the number of mushroom harvests. The increase in the amount of ash in the medium may have been due to the decrease in the organic matter content such as holocellulose and lignin.

2축 직교좌표 로봇에서 2축 직선 운동 가이드가 로봇의 기계적 성능에 미치는 영향

이종신 한국기계기술학회 2011 한국기계기술학회지 Vol.13 No.1

산업부산물인 규불화수소산을 재활용하여 합성한 규불화구리의 목재 방부효력

이종신,이병기,노재성 한국폐기물자원순환학회 2002 한국폐기물자원순환학회지 Vol.19 No.1