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Co-Co형 기관차의 수직방향 동적성능 향상에 관한 연구
박주혁,최영휴,박삼진,Park, Ju-Hyuk,Choe, Yeong-Hyu,Park, Sam-Jin 한국기계연구원 1985 기계연구원소보 Vol.14 No.-
The Primary object of this study is to predict rigid carbody's vertical and pitch acceleration and/or displacement frequency response to vertical sinusoidal rail surface irregularities for any specified point of the carbody, and to verify the predictions by means of experiments. The developed computer program also calculates vertical and pith transmissibilities and acceleration spectra. This model can be used for first order analysis of ride behabior. it's main advantage is its simplicity and ease of use. This model can be used for first order analysis of ride quality behabior. It's main advantage is its simplicity and ease of use. The model was designed with 6 degreed of freedom. Equations of motion were derived by Lagrangian method. This calculation was applied to the vertical dynamic analysis in order to pursue a possible improvement of the dynamic performance of co-co locomotive, and results were very useful.
촉매 화학기상증착 공정에서 온도구배 설정을 통한 타이타늄 기판에서의 CNT 성장 거동
박주혁,변종민,김형수,석명진,오승탁,김영도,Park, Ju Hyuk,Byun, Jong Min,Kim, Hyung Soo,Suk, Myung-Jin,Oh, Sung-Tag,Kim, Young Do 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.5
In this study, modified catalytic chemical vapor deposition (CCVD) method was applied to control the CNTs (carbon nanotubes) growth. Since titanium (Ti) substrate and iron (Fe) catalysts react one another and form a new phase ($Fe_2TiO_5$) above $700^{\circ}C$, the decrease of CNT yield above $800^{\circ}C$ where methane gas decomposes is inevitable under common CCVD method. Therefore, we synthesized CNTs on the Ti substrate by dividing the tube furnace into two sections (left and right) and heating them to different temperatures each. The reactant gas flew through from the end of the right tube furnace while the Ti substrate was placed in the center of the left tube furnace. When the CNT growth temperature was set $700/950^{\circ}C$ (left/right), CNTs with high yield were observed. Also, by examining the micro-structure of CNTs of $700/950^{\circ}C$, it was confirmed that CNTs show the bamboo-like structure.
박주혁 ( Ju Hyuk Park ),길민성 ( Min Sung Gil ),허영 ( Young Her ),김철우 ( Chul Woo Kim ),김상석 ( Sang Seok Kim ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.12
Verrucous carcinoma is an uncommon low-grade variant of squamous cell carcinoma. It is clinically characterized by its verrucous and fungating appearance and it is histologically characterized by well-differentiated epithelial proliferations that push the underlying dermis. There are some reports of verrucous carcinoma associated with abscess or fistula, but there have been no case reports of verrucous carcinoma complicated with a subcutaneous abscess involving the adjacent tissue in Korea. We report here on a case of verrucous carcinoma that presented with focal verrucous nodule infiltrating the adjacent subcutaneous tissue with diffuse subcutaneous abscess formation. (Korean J Dermatol 2009;47(12):1363∼1367)
탄소나노튜브 합성 시 촉매 금속의 분산도 향상을 위한 Ti Substrate의 표면 개질 연구
곽성열,김호규,변종민,박주혁,석명진,오승탁,김영도,Kwak, Seoung Yeol,Kim, Ho Gyu,Byun, Jong Min,Park, Ju Hyuk,Suk, Myung-Jin,Oh, Sung-Tag,Kim, Young Do 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.1
This paper describes the surface modification effect of a Ti substrate for improved dispersibility of the catalytic metal. Etching of a pure titanium substrate was conducted in 50% $H_2SO_4$, $50^{\circ}C$ for 1 h-12 h to observe the surface roughness as a function of the etching time. At 1 h, the grain boundaries were obvious and the crystal grains were distinguishable. The grain surface showed micro-porosities owing to the formation of micro-pits less than $1{\mu}m$ in diameter. The depths of the grain boundary and micro-pits appear to increase with etching time. After synthesizing the catalytic metal and growing the carbon nano tube (CNT) on Ti substrate with varying surface roughness, the distribution trends of the catalytic metal and grown CNT on Ti substrate are discussed from a micro-structural perspective.
항문 성기부위에 국한된 정상 혈중 아연농도 일과성 장병성 선단 피부염
길민성 ( Min Seong Kil ),박주혁 ( Ju Hyuk Park ),허영 ( Young Her ),천보미 ( Bo Mi Chun ),김철우 ( Chul Woo Kim ),김상석 ( Sang Seok Kim ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.11
A male full-term infant who had been breast-fed since birth developed an erythematous eroded eruption involving the anogenital area at 1 month of age, and this lesion did not respond to treatment with topical corticosteroids and antimicrobials. He was first seen at our office at 9 months of age. At that time, he had continuous diarrhea, but he had no alopecia, nail dystrophy or acral skin lesions. His serum zinc level was normal and his mother`s breast milk zinc level was also normal, but it was not enough for his zinc metabolism. His clinical symptoms and skin lesions were dramatically improved with administering zinc. (Korean J Dermatol 2009;47(11):1314~1317)
Dermoscopy를 이용한 속눈썹 사면발이감염증의 진단과 치료
허영 ( Young Her ),박주혁 ( Ju Hyuk Park ),천보미 ( Bo Mi Chun ),김철우 ( Chul Woo Kim ),김상석 ( Sang Seok Kim ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.12
Pthiriasis palpebrarum is a rare disease in which crab lice infest the eyelashes. It can cause pruritic lid margins, and it is difficult to diagnose and treat. We diagnosed and managed a case of pthiriasis palpebrarum in the right upper eyelid of a 35 month-old male child. We removed the lice and nits by pulling with fine forceps using dermoscopy. After treatment, all lice and nits had been eradicated without recurrence. We suggest that this is an effective, safe method for diagnosis and treatment of pthiriasis palpebrarum. (Korean J Dermatol 2008;46(12):1623∼1625)
허영 ( Young Hur ),박주혁 ( Ju Hyuk Park ),천보미 ( Bo Mi Chun ),김철우 ( Chul Woo Kim ),김상석 ( Sang Seok Kim ) 대한피부과학회 2008 大韓皮膚科學會誌 Vol.46 No.12
Malignant glomus tumor, or glomangiosarcoma, is a very rare neoplasm that typically arises from a benign glomus tumor. Despite having the histological features of malignancy, these tumors usually do not metastasize. We report a case of malignant glomus tumor on the finger of an 18-year-old man. By histology, round to ovoid tumor cells showed a uniform appearance of round nuclei. Many mitotic figures and nuclear atypia were observed. Immunohistochemically, vimentin and alpha-smooth muscle actin showed intense staining. This case was considered to be a malignant glomus tumor. Thus, it was a glomangiosarcoma arising de novo. (Korean J Dermatol 2008;46(12):1661∼1663)
천보미 ( Bo Mi Chun ),박주혁 ( Ju Hyuk Park ),허영 ( Young Her ),김철우 ( Chul Woo Kim ),김상석 ( Sang Seok Kim ) 대한피부과학회 2009 大韓皮膚科學會誌 Vol.47 No.1
Transmission of animal scabies to human is probably rare because of the relative host specificity of the mites. However, recurrent exposure to animal scabies mites can produce troublesome and diagnostically puzzling lesions. We report herein on a human infestation of canine scabies and this occurred in a 26-year-old male who presented with a 4-month history of severe pruritic skin lesions. His puppy was diagnosed with scabies infestation by a veterinarian two months previously. Since that time, he no longer raised the puppy. Microscopic examination of a mineral oil preparation after scraping the papules revealed a mite. He was diagnosed with canine scabies. (Korean J Dermatol 2009;47(1):104~107)
박용욱,이창주,정영기,유정한,박주혁,Park, Yong-Wook,Lee, Chang-Ju,Chung, Yung-Khee,Yoo, Jung-Han,Park, Ju-Hyuk 대한족부족관절학회 1998 대한족부족관절학회지 Vol.2 No.1
The conventional surgical treatment for deformed foot has always consisted of massive soft tissue releases combined with varying methods of osteotomies and fusions to plantigrade functional foot. But, the resulting feet have often been foreshortened, stiff, and nothing more than a cosmetically acceptable but functionally poor foot. Now the techniques of distraction histogenesis has been given a new tool to apply to the complex foot deformity. We have recently experienced two cases of severe deformed feet and treated with Ilizarov technique. One patient had postcompartmental severe rigid equinocavovarus foot. And the other had traumatic severe rigid metatarsus abductus. The follow up periods were 14 and 28 months respectively. The feet were aesthetically pleasing. So, we believed that the Jlizarov technique is an excellent treating method for severe deformed foot.
허영 ( Young Her ),길민성 ( Min Seong Kil ),박주혁 ( Ju Hyuk Park ),김철우 ( Chul Woo Kim ),김상석 ( Sang Seok Kim ) 大韓皮膚科學會 2009 大韓皮膚科學會誌 Vol.47 No.11
Acute generalized exanthematous pustulosis (AGEP) is an uncommon aseptic pustular eruption that usually follows recent administration of oral or parenteral drugs. Characteristic AGEP features include the sudden onset of fever with widespread erythematous eruption, rapidly progressing to a fine, non-follicular, micropustular rash. The illness usually resolves spontaneously with fever and pustulation clearing within 15 days, sometimes followed by desquamation. Histopathology shows non-follicular spongiotic pustules in the epidermis filled with neutrophils, a mixed perivascular infiltrate of neutrophils and occasional eosinophils with papillary dermal edema. We describe a 10-month-old boy with AGEP secondary to exposure to amoxicillin. This is an uncommon condition in children. (Korean J Dermatol 2009;47(11):1321~1323)