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김형중 ( Hyoung Joong Kim ),김세혁 ( Se Hyuk Kim ),김순기 ( Soon Ki Kim ),윤승환 ( Seung Hwan Youn ),박현선 ( Hyeon Seon Park ),김은영 ( Eun Young Kim ),박형천 ( Hyung Chun Park ) 대한뇌종양학회 2003 대한뇌종양학회지 Vol.2 No.2
Congenital glioblastomas have been rarely reported in the literatures and known to have a higher propensity to cause intratumoral hemorrhage compared to pediatric brain tumors. We report a case of definite congenital glioblastoma, which was not detected by endovaginal fetal sonography until 35+1 weeks gestation and presented with intratumoral hemorrhage after birth. Brain CT and MRI scan showed a intracranial mass with internal hemorrhage and small portion of contrast enhancement. If the rapid growing intracranial lesion with internal hemorrhage is detected by fetal sonography or MRI late in gestation, a congenital malignant tumor as well as vascular malformations should be considered.
분산중합에 의한 폴리아미드 12 올리고머의 제조와 그를 이용한 Poly(ether-block-amide)의 특성
김두현(Doo Hyeon Kim),이지훈(Ji Hun Lee),김형중(Hyung Joong Kim) 한국고분자학회 2012 폴리머 Vol.36 No.4
열적으로 안정한 탄화수소계 액상 파라핀인 YK-D130을 분산매로 사용하여 ω-amino carboxylic acid와 adipic aicd로부터 폴리아미드 12(PA12) 올리고머(oPA1)를 제조하였으며 이들을 통상의 벌크중합으로 제조되는 비슷한 분자량의 폴리아미드 올리고머(oPA2)로 합성하여 분자량과 기타 특성을 비교하였다. 색도 분석 결과 oPA1이 더 밝은 백색을 나타냈고, GPC 결과로부터 oPA1가 더 좁은 분자량 분포를 보였다. 나아가 oPA1과 oPA2를 hard segment로 하고 poly(tetramethylene glycol)(PTMG)을 soft segment로 하는 탄성의 poly(ether-block-amide)(PEBA)를 합성하였다. 합성된 PEBA의 분자량과 기계적 성질 등을 비교 분석하였다. Polyamide 12 (PA12) oligomers (oPA1) were prepared by dispersion polymerization of ω-amino carboxylic acid and dibasic acid in a dispersion medium, thermally stable hydrocarbon liquid paraffin, YK-D130 (a step polymerization). The molecular weight and various properties of other oligomeric PAs (oPA2) obtained by bulk polymerization without the medium were compared with those of oPA1s. The oPA1s showed lighter white color and narrower molecular weight distribution than oPA2s at the same molecular weight. Moreover elastomeric poly (ether-block-amide) (PEBA)s were synthesized with oPA1 and oPA2 as hard segments and poly(tetramethylene glycol) (PTMG) as a soft segment. The molecular weight distribution, and mechanical property of the PEBA originated from the both oligomeric PAs were characterized.
확장된 파트너 교환을 이용한 복원 가능한 정보 숨김 기술
우재현(Woo Jae-Hyeon),김형중(Kim Hyoung-Joong),바실리(Sachnev Vasiliy),최수정(Choi Su-Jeong) 한국방송·미디어공학회 2007 한국방송공학회 학술발표대회 논문집 Vol.2007 No.-
기존의 Steganography는 정보를 숨김에 있어 히스토그램을 shifting 하거나 픽셀간의 상관관계를 변형하는 등 다양한 방식이 제안되었다. 그런 논문들이 가지고 있던 용량적 한계를 일부 극복하고, PSNR을 고려하여 새로운 방식을 제안한다. 소개하는 기술은 두 색깔을 파트너로 맺어, 숨김 비트에 따라 서로 파트너로 바뀌도록 설계되었다. 숨긴 용량의 크기와 PSNR의 변화를 실험 결과에서 볼 수 있으며, 이는 기존 논문과의 비교를 통해 효율성이 입증된다.
물옥잠을 이용한 수중처리방법에 의한 농공단지 폐수처리에 관한 연구
윤춘경 ( Yoon Chun Gyeong ),김형중 ( Kim Hyung Joong ),류재현 ( Ryu Jae Hyeon ),여운식 ( Yo Woon Shik ) 한국농공학회 1997 韓國農工學會誌 : 전원과 자원 Vol.39 No.3
Floating aquatic plant system using water hyacinth was applied to examine feasibility as a wastewater treatment system for the industrial complex in rural area. The wastewater from the industrial complex does not likely contain toxic pollutants because the industries which generate wastewater with toxic compounds are not allowed to move in. Pilot plant was installed at Baeksuk Nongkong Danzi in Chunahn-City, Chunchungnam-Do, and field study was performed during summer and fall of 1996. Hydraulic loading rate was 0.19m<sup>3</sup>/m<sup>2</sup> ·day. The effluent concentration of DO was higher than influent, and it implies that 0.6m depth reactor was reaerated enough to increase DO level. The influent concentration of BOD varied significantly from less than 30 to 120mg/ ℓ during the study period, however, effluent concentrations were generally lower than the water quality standard and removal efficiency was up to 85 %. The influent concentration of COD also showed wide variation from less than 40 to 160mg/ ℓ, and effluent concentration was higher than water quality standard when influent concentration was over 100mg/ ℓ. The influent concentrations of T -Nand T - P were lower than water quality standard and no further treatment was required, and these compounds were also removed in the system. Although some improvement and refinement are still required, overall, the floating aquatic plant system was proved to be feasible to apply to treat wastewater from industrial complex in rural area.
정주현(Jung Ju-Hyeon),김지은(Kim Ji-Eun),문연이(Moon Yeoun-Yi),김형중(Kim Hyoung-Joong),심제명(Shim Je-Myung) 한국체육과학회 2009 한국체육과학회지 Vol.18 No.2
Purpose : The purpose of this study was to investigate the effect of functional change of the whole body to wear hidden increaser. Subject : We examed 21 students undergraduate in M college who had healthy male. Experimental group of ten subjects weared hidden increaser. Control group of eleven subjects. Method : First of all, Balance test was operated unilateral stance test and functional reach test(FRT). Functional reach test(FRT) was divided to the whole surface and the side surface. Sensory test was operated to two point discrimination, tactile sense test and sense of position test. The last, range of motion(ROM)test of ankle was operated goniometer. Results : The results were as follows; 1) It showed significantly differences between pre and post test on experimental group in FRT heel up test and FRT heel down test(p<.05), also pre-post variation at heel up test showed significantly difference on experimental group(p<.05). 2) The LRT test showed significantly differences between pre and post test on experimental group(p<.05). 3) The range of motion(ROM) test showed significantly differences between pre and post test on experimental group, also pre-post variation at range of motion test showed significantly difference on experimental group(p<.05). 4) It showed significantly differences between pre and post on experimental group in two-point discrimination and sense of position test(p<.05), also pre-post variation at two-point discrimination and sense of position test showed significantly difference on experimental group(p<.05). Coclusion : When experimental group wore hidden increaser for 4 weeks, the balance ability of experimental group was more decreased than control group, two point discrimination and sense position test was decreased and range of motion(ROM)of ankle test was increased, but, tactile sense test was not changed at sense ability. The result suggest that long time experience in wearing hidden increaser may be caused sensory change, decreased balance ability and range of motion change.
수온이 물옥잠 및 인공저습지의 폐수처리 효율에 미치는 영향
윤춘경,김형중,류재현 建國大學校 附設 農業資源開發硏究所 1997 農資源開發論集 Vol.19 No.-
ABSTRACT Natural wastewater treatment systems were evaluated for the wastewater from the industrial complex in rural areas. For the treatment of wastewater from the industrial complex in rural areas, a pilot plant of the constructed wetland and aquatic plant system using water hyacinth were installed at Baeksuk Nongkong Danzi in Chunahn-City, Chunchungnam-Do. The field experiment with these pilot plants was performed for 1996 and 1997.In aquatic plant system hydraulic loading rate of wastewater was about 0.2㎥/㎡·day and theoretical detention time was 3.2 days. In the constructed wetland 0.19㎥/㎡·day, 1.05 days, respectively.The influent concentration varied significantly, however, effluent concentrations were generally lower then the water quality standard. The removal rate was increased by water temperature but didn't have high correlationship. Compared to existing systems. this system is quite competitive because it requires low capital cost, almost no energy and maintenance, and therefore, very cost effective.Overall, the result showed that constructed wetland system and aquatic system using water hyacinth is a feasible alternative for the treatment of wastewater from industrial complex in rural areas and rural sewage.