백서 연조직 창상 치유 기전에 관한 광학현미경 및 면역조직화학적 연구

박상춘(Sang Chun Park),김경욱(Kyung Wook Kim),이재훈(Jae Hoon Lee),김창진(Chang Jin Kim) 대한구강악안면외과학회 1999 대한구강악안면외과학회지 Vol.25 No.2

Once tissue are injured by certain causes, our body can t maintain a normal biologic rhythm, and because of this, wound healing responses start right after the injury. The healing process can be divided into four stages: ① inflammatory phase ② epithelialization phase ③ proliferation phase ④ maturation phase. Each phase is overlapped and continued without any apparently distinguishable characteristics. The factors affecting on wound healing are wound management, nutritional element, environment factor, and existence of other diseases. This research was focused on overall examination of tissue alteration on each stage of wound healing by artificially designing skin defect on rats so that the result from the examination could be easily applied to clinical activity. To do this, After the hair on the dorsal surface was shaved, 15×8㎜ oval skin defect was formed. The rats were examined intensely on the 3rd, 7th, 15th, 21st day, and were sacrificed on the 30th day. After fabricating 4㎛ paraffin specimen, H-E staining, MT staining, immunohistochemical study using PCNA and α-SMA were performed respectively. The outcomes were as follows: 1. On the 3rd day, severe edema, and acute inflammatory reaction were seen. Collagen deposition and blood vessel proliferation were started from the 7th day. On the 15th day, collagen deposition was increased and new blood vessel proliferation was intensified. 2. Acute inflammatory reaction was completely disappeared and collagen deposition was critically increased on the 21st day. Reepithelialization observed from the 21st day reached at the nearly normal status on the 30th day. 3. In the control group, PCNA positive reaction was seen on the basal layer and hair follicle of epidermis ; however, in the experimental group, PCNA positive reaction was increased on the basal cell layer and hair follicle as re-epithelialization occurred. 4. Blood vessel proliferation observed by α-SMA positive reaction was the most intense on the 15th day, and as time went by, the proliferation decreased. As re-epithelialization was continued, α-SMA positive reaction increased on the basal cell layer of epidermis and surrounding hair follicle. According to the above results, it was confirmed that the re-epithelialization of rats began on the 21st day when inflammatory reaction was disappeared and, on the 30th day, it was recovered to the stage similar to a normal status. This kind of recovery from skin defect started with re-epithelialization on the basal cell layer and surrounding hair follicle.

저시(Low Vision)아동의 운동능력에 관한 연구

박상춘 ( Sang Chun Park ),홍재영 ( Jae Young Hong ),한성희 ( Seong Hee Han ) 한국특수교육문제연구소 2008 특수교육저널 : 이론과 실천 Vol.9 No.1

이 연구는 시각장애아동의 운동능력의 실태를 알아보기 위해 단계적으로 접근하고자 하며, 우선 시각적 모방이 가능한 저시아동을 중심으로 운동능력 실태 및 연령별 발달의 경향을 알아보고자 한다. 이에 초등부 저시아동의 운동능력을 조사 분석하여 운동발달의 경향을 알아봄으로써, 시각장애아동의 신체활동과 관련된 교과교육과 개별화교육계획 및 교수-학습과 정의 계획을 수립하는데 기초자료를 제공하고자 한다. 이 연구의 결과 초등부에 재학 중인 저시아동은 저시아동의 성별에 따른 운동능력의 차이는 없었으나 생활연령에 비해 운동연령이 평균 48.31개월 정도의 지체를 보였으며, 생활연령 증가에 따른 운동능력 발달경향은 생활연령이 증가함에 따라 저시아동은 그들의 생활연령에서 기대되는 운동능력보다 현저하게 지체됨을 알 수 있었다. 이 연구의 결과를 토대로 시각 손상 아동의 학령기에서의 두드러진 지체를 보완.완화하기 위해 초등학교 저학년 시기에 적절한 운동발달 프로그램을 적용한다면 이러한 지체의 심화 과정을 좀 더 완화 시킬 수 있을 것이라 생각된다. 또한 저시아동의 지체된 운동능력을 보상하기 위한 적절한 운동발달 프로그램의 개발과 적용이 필요하다고 생각된다. 이러한 프로그램의 적용은 이후 계속되어지는 학령기 동안 저시아동이 적극적으로 신체활동이나 스포츠 또는 여가 활동에 참여할 수 있는 계기를 제공할 수 있을 것이다. The purpose of the study was to investigate low vision children``s tendency toward motor abilities and the development. The participants who have low-visual acuities consisted of 26 male students and 23 female students from 7 elementary special education school across the country. In addition, participants do not have any multiple disabilities except visual impairment. The sample was a purposive sampling method and it was examined and analyzed through Oseretsky test of motor proficiency The major findings of the study are summarized briefly below Fristly, comparing with total motor age and sub-categorical motor age, the results of the study, contact in the proper place for 0.89 months, contact in hand operation for 0.65 months, motor speed for 1.14 months, single operation accomplishment ability for 0.57 months were delayed. But there was a degree of development between contact in general operation for 1.25 months and same time voluntary operation for 1.29 months. There was statistically a significant differences for the results and there was statistically no significant differences for only single operation accomplishment ability Secondly, motor age delay was 48. 31 months average comparatively with chronological age and there was differences at the .001 significance level. Thirdly, There was no significance differences about gross motor abilities between male and female students who have visual impairment. But, there was a significant difference(p >.05) that female students than to the male students was delayed 7.92 months for motor speed among motor abilities in sub-category fourthly, as chronological age increasing, The development and process of the gross motor abilities of children with visual impairment little bit improved. But each age group showed motor delay from 28 months to 62.53 months and the more chronological age, the worse degree of delay The results of the study is able to provide basic information in terms of planning of subject education related motor activities, individualized education plan, and process of instruction and learning

해양 조난수신 대응체계 개선방안에 관한 연구

박상춘(Sang-Chun Park),김영습(Young-Sup Kim) 한국항해항만학회 2015 한국항해항만학회 학술대회논문집 Vol.2015 No.추계

해상에서 조난신호를 발사할 수 있는 장비는 전 세계해상 조난 및 안전제도(Global Maritime Distress Safety System) 해역의 구분에 따라 A1 해역은 초단파(Very High Frequency) 그리고 레이더 트랜스 폰더(SART), A2 해역은 중 단파대(MF/HF Radio Equipment)무선통신장비, A3 해역은 INMARSAT 그리고 A4 해역은 비상위치지시용 무선표지설비(Emergency Position Indicating Radio Beacon) 등으로 구분할 수 있으며, 조난을 수신할 수 있는 무선국은 해양경비안전본부 소속의 구난무선국, 경비함정, 상황센터, 해상교통관제센터 등으로 분산되어져 각각 운영하고 있다. 이로 인해 조난의 중복수신, 통계의 부정확, 다수의 컨트롤 타워 등의 문제점이 상존해 있는 실정이다. 아울러 현재 해양경비안전본부 주관으로 전국 5개 구난무선국을 하나의 국제안전통신센터로 구축하기 위해서 추진 중에 있다. 기존 5개 구난무선국을 하나의 국제안전통신센터로 구축하는 것은 향후 국가간 정보연계 측면에서는 효율적이나 실제 해양사고 발생 시 효율적으로 대응하기에는 다소 애로점을 안고 있는 실정이다. 이에 따라 본 연구에서 실제 해양사고 발생시 가장 신속하게 대응할 수 있는 체계를 제안하고자 한다. Equipments that can transmit maritime distress signals in accordance to Global Maritime Distress Safety System are the followings: A1 water(Very High Frequency, SART), A2 water(MF/HF Radio Equipment), A3 water(INMARSAT), A4 water(Emergency Position Indicating Radio Beacon). Institutions with the capacity to receive distress signals are Korea Coast Guard affiliated radio stations, patrol ships, Rescue Coordination centers, Vessel Traffic centers, Complex problems regarding repetitive distress alarms, inaccurate statistics, multiple control towers are existent. Consequently, effective measurement to resolve dispersed operating maritime distress signal system are in time of need. Moreover, current KCG Headquarter is considering to integrate five distress radio stations dispersed across nation into a single international safety communication center. The integration of radio stations are efficient in terms of information coordination between nations, however, it cannot support efficient response to real-time maritime incident. Therefore, in this study, a new system that can rapidly response to real-time maritime incident will be proposed.

필드 플레이트 구조에 대한 GaN FET 항복전압특성 영향

장우진(Woojin Chang),김정진(Jeong-Jin Kim),배성범(Sung-Beom Bae),박영락(Young-Rak Park),문재경(Jae-Kyoung Mun),고상춘(Sang-Chun Ko) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6

This paper presents various field plates (FPs) fabricated on GaN Field Effect Transistors (FETs) using AlGaN/GaN on sapphire substrates. GaN FETs with six different FPs were fabricated to compare with their FPs and lengths of FPs in terms of their breakdown voltage characteristics. The fabricated GaN FET with the gamma-shaped gate FP exhibited a breakdown voltage of 1190 V for a gate-to-drain spacing of 15㎛, while the GaN FET without any FP (a planar gate) showed a breakdown voltage of 1050 V for the same gate-to-drain spacing. For the GaN FETs with 10㎛ gate-to-drain spacing and gamma-shaped gate FPs, they were varied 0~2 ㎛ in the length of the gamma-shaped gate FPs and the GaN FET with 0.5㎛-length gamma-shaped gate FP showed more 50~140 V than the others. And in another processed wafer, the GaN FET with the source FP and the gamma-shaped FP together had a breakdown voltage of 1480 V more than 870 V with only the source FP for a gate-to-drain spacing of 16㎛.