곁사슬을 갖는 새로운 액정중합체의 합성 및 특성

전옥철,김윤준,류범영,최재곤,조병욱,홍진후 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.1

A series of wholly aromatic polyesters with side chains were synthesized by solution polycondensation from 2,5-dialkoxyterephthaloyl chlorides with the corresponding diol. The polymers showed the schlieren textures which is indicative of a nematic phase above their melting temperature. The inherent viscosities (η_(inh)) measured at 35℃ in phenol/p-chlorophenol/1,1,2,2-tetrachloroethane were 0.56-0.98 dℓ/g. The glass transition temperature (T_(g)) and melting temperature (T_(m)) decreased with increasing the length of the alkoxy side chain. Initial decomposition temperatures in TGA occurred at 338 ~ 363℃ in N₂ gas and thermal stability of polymers decreased with increasing the length of the side chain.

유기물의 고온호기성 분해에 미치는 미생물제재의 효과

전병관,지준명,문병선 동신대학교 환경연구소 1999 환경연구 Vol.4 No.1

본 연구에서는 기존의 그리고 자체 개발한 미생물제재의 식종이 음식물찌꺼기의 고온호기성 생분해에 미치는 효과와 음식물찌꺼기의 고온호기성 분해산물이 토양의 pH에 미치는 영향에 대해 분석하였다. 고온호기성 미생물제재를 식종한 경우에, 반응개시 후 12시간동안 시료의 PH는 미생물을 식종하지 않은 경우보다 상대적으로 급속히 하락하였다. 시료의 C/N비는 반응개시 후 48시간동안 식종 및 미식종의 경우에 모두 큰 변화가 없었고, 분해산물중 미생물의 수는 24시간까지 급격히 감소하였으나 이 후로 증가하여 48시간 후에 비슷한 수준에 도달했다. 결과적으로, 음식물찌꺼기의 고온호기성 생분해과정에 미치는 미생물제재의 식종 효과는 미미했다. 위의 고온호기성 분해산물은 별도의 부숙과정을 거치지 않더라도 토양을 산성화시키지 않고 오히려 적절한 온도와 습도하에서 산성토양을 중화시켰다. The effect of addition of thermophilic oxic microorganisms(TOM) during thermophilic aerobic biodegradation(TAB) of food waste at 60°C was analyzed in terms of pH profile, C/N ratio, and microorganism count of food waste TAB products during the digestion. For the first 12 hours, pH of the products containing TOM decreased slightly faster than that of the products without TOM. Both pH profiles converged on around pH 4.3 after 12~24 hours and gradually climed up to pH 4.5~4.8 after 48 hours. C/N ratios of both TOM-treated and TOM-untreated food waste fluctuated minutely in between 15 and 17. The number of thermophilic aerobic microorganisms in the TAB products from the TOM-treated and TOM-untreated similarly increased 5~10 folds after 48 hours, which converts to merely 3~4 cell divisions during the 48 hour long process. Above results indicated only slight advantage of TOM treatment on TAB of food waste. However, due to rather costly process of TOM stock maintenance and mass culture, the need for the TOM treatment is not conclusive. Existing microorganisms within food waste from households and restaurants may be more than enough for the biodegradation process. Besides, the TAB product, whose pH is 4.39, neutralized the pH of garden soil from pH 5.42 to pH 7.0 or above after 14 days during summer months when both were mixed in equal parts.

내열성 액정 고분자의 합성 및 복합재료

조병욱,전옥철,김윤준,한철,최재곤 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.2

A new thermotropic liquid crystalline copolyester(TLCP) was synthesized by condensation polymerization of 2,6-naphthalene dicarbonyl chloride with the corresponding diol having a tetramethylene and a hexarnethylene group. The blends of the TLCP with PEN were prepared by the coprecipitation from a common solvent. The TLCP and blends (2, 5, 10 and 20wt% TLCP) were characterized in terms of their thermal, mechanical properties and morphology. The TLCP in the melt state showed nematic mesophase identified by thread-like optical texture. The glass transition temperature (T_(g)) and cold crystallization temperature (T_(c)) of PEN in the blends decreased with increasing the content of TLCP and the TLCP acted as anucleating agent for the matrix polymer. Interfacial adhesion between the TLCP and PEN seemed to be poor. The modulus of TLCP/PEN blends was enhanced as the TLCP content increased.

원형 탈모증 환자에서의 감정표현불능증

박두병,전창무,손인기,민경준,김영돈,노병인 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.5

연구목적 : 감정표현불능증이 정신신체질환의 특징적인 성격 경향 인지에 대해 논란이 많이 있어 왔다. 이에 정신신체질환이면서 피부과 외래 환자의 다수를 차지하는 원형탈모증 환자에 있어서의 감정표현불능증에 대해 알아보았다. 방 법 : 원형탈모증 환자군(31명)과 연령, 성별을 대비시킨 정상대조군(31명)에서 MMPI, SCL-90-R, TAS-20K를 시행하였다. 정신신체질환 이외의 질환에 의한 영향을 배제하기 위해 다른 정신과 질환이 있다고 판단되는 경우는 제외시켰다. 집단간의 비교를 위해 paired t-검증을 실시하였다. 결 과 : 원형탈모증 환자군에서 MMPI 결과는 F 척도, K 척도, Hs 척도, D 척도, Hy 척도, Pd 척도, Pa 척도, Pt 척도, Sc 척도의 점수가 정상대조군에 비해 의미있는 차이를 보였고(p<0.05), SCL-90-R 점수에서는 SOM 척도, O-C 척도, I-S 척도, DEP 척도, ANX 척도, HOS 척도, PHOB 척도, PAR 척도, PSY 척도, GSI, PSDI, PST 점수가 정상대조군보다 유의하게 높은 점수를 보였다(p<0.05). 또한 TAS-20K 점수에서는 환자군이 정상대조군에 비해 Factor 1과 총점에서 유의하게 높은 점수를 보였다(p<0.05). 결 론 : 결론적으로, 원형 탈모증 환자군에서 정상 대조군에 비해 감정표현불능증이 더 심하고 특히 자신의 느낌을 잘 알지 못하는 것으로 나타났다 이는 원형탈모증 환자의 심리적인 대처기전을 세워 나가는데 좀더 주의를 기울이고, 더 많은 관심을 가져야 한다는 것을 의미한다. Objectives : Alexithymia has been regarded as the general personality of psychosomatic disease, but it's controversial. The object of the study is to find out the relationship between alexithymia and alopecia areata. Methods : Thirty one alopecia areata patients were compared to 31 normal healthy persons in alexithymic tendency using TAS-20K Also MMPI and SCL-90-R were checked in both groups. Psychiatric diseases were ruled out. Results : The scores of F, K, Hs, D, Hy, Pd, Pa, Pt and Sc of MMPI in alopecia areata patients were different from those in normal healthy persons. The scores of SOM, O-C, I-S, DEP, ANX, HOT, PHOB, PAR, PSY,GSI, PSDI, and PST of SCL-90-R in alopecia areata patients were significantly higher than those in normal healthy persons. In TAS-20K, the scores of Factor I and Total in alopecia areata patients were higher than those in normal healthy persons. Conclusion : Our results suggest that alopecia areata patients are more alexithymic than normal healthy persons.

폐경기여성에서 시청각 교육이 호르몬대체요법의 시행과 골다공증관련 생활습관의 변화에 미치는 효과

정태흠,전태희,김문찬,김영일,전대준,양승오,함수연,고병균,김성률 大韓家庭醫學會 2000 Korean Journal of Family Medicine Vol.21 No.11

Tracking Robot Control of 2D Moving Target by a Robot Vision

Byung-Joon Jeon,Young-Ho Hong,Dong Hwan Kim 제어로봇시스템학회 2002 제어로봇시스템학회 국제학술대회 논문집 Vol.2002 No.10

The Anconeus Muscle Free Flap: Clinical Application to Lesions on the Hand

Jeon, Byung-Joon,Jwa, Seung Jun,Lee, Dong Chul,Roh, Si Young,Kim, Jin Soo Korean Society of Plastic and Reconstructive Surge 2017 Archives of Plastic Surgery Vol.44 No.5

Background It can be difficult to select an appropriate flap for various defects on the hand. Although defects of the hand usually must be covered with a skin flap, some defects require a flap with rich blood supply and adequate additive soft tissue volume. The authors present their experience with the anconeus muscle free flap in the reconstruction of various defects and the release of scar contractures of the hand. Methods Ten patients underwent reconstruction of the finger or release of the first web space using the anconeus muscle free flap from May 1998 to October 2013. Adequate bed preparations with thorough debridement or contracture release were performed. The entire anconeus muscle, located at the elbow superficially, was harvested, with the posterior recurrent interosseous artery as a pedicle. The defects were covered with a uniformly trimmed anconeus muscle free flap. Additional debulking of the flap and skin coverage using a split-thickness skin graft were performed 3 weeks after the first operation. Results The average flap size was $18.7cm^2$ (range, $13.5-30cm^2$). All flaps survived without significant complications. Vein grafts for overcoming a short pedicle were necessary in 4 cases. Conclusions The anconeus muscle free flap can be considered a reliable reconstructive option for small defects on the hand or contracture release of the web space, because it has relatively consistent anatomy, provides robust blood supply within the same operative field, and leads to no functional loss at the donor site.

Analysis of 344 Hand Injuries in a Pediatric Population

Jeon, Byung-Joon,Lee, Jung-Il,Roh, Si Young,Kim, Jin Soo,Lee, Dong Chul,Lee, Kyung Jin Korean Society of Plastic and Reconstructive Surge 2016 Archives of Plastic Surgery Vol.43 No.1

Background The purpose of this study was to identify comprehensive hand injury patterns in different pediatric age groups and to assess their risk factors. Methods This retrospective study was conducted among patients younger than 16-year-old who presented to the emergency room of a general hospital located in Gyeonggi-do, Republic of Korea, and were treated for an injury of the finger or hand from January 2010 to December 2014. The authors analyzed the medical records of 344 patients. Age was categorized according to five groups. Results A total of 391 injury sites of 344 patients were evaluated for this study. Overall and in each group, male patients were in the majority. With regard to dominant or non-dominant hand involvement, there were no significant differences. Door-related injuries were the most common cause in the age groups of 0 to 3, 4 to 6, and 7 to 9 years. Sport/recreational activities or physical conflict injuries were the most common cause in those aged 10 to 12 and 13 to 15. Amputation and crushing injury was the most common type in those aged 0 to 3 and 4 to 6 years. However, in those aged 10 to 12 and 13 to 15, deep laceration and closed fracture was the most common type. With increasing age, closed injuries tended to increase more sharply than open injuries, extensor tendon rupture more than flexor injuries, and the level of injury moved proximally. Conclusions This study provides a comprehensive overview of the epidemiology of hand injuries in the pediatric population.

Remote Monitoring and Control of the Real Robot associated with a Virtual Robot

Byung Joon Jeon,Dong Hwan Kim 제어로봇시스템학회 2005 제어로봇시스템학회 국제학술대회 논문집 Vol.2005 No.6

김지하 초기시에서 수동적 적극성의 의미

전병준 ( Byung Joon Jeon ) 우리어문학회 2012 우리어문연구 Vol.43 No.-

This thesis is written to clarify the meaning of the passive activity(Gelassenheit) in the Kim, Ji-ha`s early poems. It has been mostly agreed that Kim`s poems are divided to two main streams. One is the political resistance poems, and the other is the lyrical life poems. Consented to the precedented inquiries, this study focused on the speech Kim addressed, which shows the important characteristic. It can be thought as the passive activity(Gelassenheit) which Heidegger mentioned, i.e. accepting the other he comes to notice the inter-subjectivity between the subject and the object. The subject becomes the subject through the process that he comes under the territory of the passivity by letting himself to the other. In that process the Zen-Buddhism played the important role to overcome the grudge and the abhorrence to the people who performed the violence to him. By passing this course the subject can meet the other as the personal subject. This paper concluded that Kim comes to understand the meaning the generous affirmation of the whole life through this series of course.