경화시간 및 코로나 열화에 따른 에폭시 복합체의 열자격 전류특성

박건호,김영천,황석영,이준웅 한국전기전자재료학회 1995 電氣電子材料學會誌 Vol.8 No.6

This paper examines the electrical properties according to a curing time and a corona degradation in epoxy composites which are used for transformers. To consider these phenomena, the electrets were formed by appling high voltages to five kinds of specimens designed according to a constant mixing rate and then TSC(Thermally Stimulated Current) values at the temperature range of -160-200[>$^{\circ}C$] were measured from a series of experiments. The behaviour of carrier and its possible origins in epoxy composites were studied. Various effects of curing time and electric field on epoxy composites were also investigated.

호남지방에 있어서 지대별 차이가 수도의 생육 및 양분흡수에 미치는 영향 제1보 질소 및 규산시용량에 따른 수도수량과 양분흡수차이

박건호,이덕배,권태천,이상영 한국작물학회 1988 한국작물학회 학술발표대회 논문집 Vol.1988 No.-

빔포밍을 위한 저 전력 능동형 위상 천이기

박건호,박철순 한국ITS학회 2018 한국ITS학회 학술대회 Vol.2018 No.04

원유수급 안정과 낙농산업 발전

박건호 한국유가공기술과학회 2001 Journal of Dairy Science and Biotechnology (JMSB) Vol.19 No.1

This paper look into the development of Korea dairy industry. It suggest a system that for increasing international competition power of Korea dairy industry and stabilize raw milk supply. It is related to Dairy farmers, Dairy industry companies, and the Government

통계분석 기법을 적용한 고점도 아스팔트 바인더의 저온 휨 특성 연구

박건호,박성현,박태순,문기훈 한국아스팔트학회 2023 한국아스팔트학회지 Vol.13 No.2

Porus asphalt pavement, with a 20% porosity compared to conventional asphalt, allows for the generation of high-pressure water infiltration during rainfall. To prevent premature oxidation of the asphalt binder due to exposure to UV rays and wind, high-modulus asphalt binders are utilized. In addition to the standard performance grade test, a flexural beam test is conducted for freeze-thaw vulnerability assessment. Currently, flexural beam test is conducted at -20°C regardless of the performance grade. To evaluate the suitability of this test temperature, mathematical modeling and statistical analysis were performed, confirming the appropriateness of the current flexural beam test temperature of -20°C.

Comparative Evaluation of Mn(II) Framework Substitution in MnAPSO-34 and Mn-impregnated SAPO-34 Molecular Sieves Studied by Electron Spin Resonance and Electron Spin Echo Modulation Spectroscopy

박건호,김양희,조영수,이용일,이철위 한국자기공명학회 2002 Journal of the Korean Magnetic Resonance Society Vol.6 No.1

영어논문 MnAPSO-34 and Mn-impregnated SAPO-34(Mn-SAPO-34) sample were prepared with various manganese contents and studied by electron spin resonance(ESR) and electron spin echo modulation(ESEM). Electron spin echo modulation analysis of 0.07mol % Mn(relative to p) in MnAPSO-34 with adsorbed D2O shows two deuteriums at 0.26 nm and two at 0.36 nm from Mn. This suggests that two waters hydrate an MnO4 configuration with a D-O bond orientation for the waters as expect for a negatively charged site at low manganese content (0.1 mol%), the ESR spectra of MnAPSO-34 and MnH-SAPO-34 exhibit the same parameters(g  2.01 and A  89 G), but the spectra obtained from MnAPSO-34 samples are better resolved. The decomposition temperature of as-synthesized MnAPSO-34 were in the range of 200 – 600 oC of the morpholine which is 12 oC higher than that in as-synthesized MnH-SAPO-34. Infrared spectra showed that the position of a band at 3450 cm-1 shifted about 15 cm-1 toward higher energy in MnAPSO-34 versus MnH-SAPO-34. The modulation depth of the two-pulse ESE of MnAPSO-34 with adsorbed D2O is deeper than that of MnH-SAPO-34 with adsorbed D2O. Three-pulse ESEM of MnAPSO-34 and MnH-SAPO-34 with adsorbed deuterium oxide shows that the local environments of manganese in the hydrated samples are different, suggesting that Mn(II) is framework substituted in MnAPSO-34 since it obviously occupies an extraframework position in MnH-SAPO-34.

악성 전이 소견을 보인 양측 난소에 발생한 Sertoli-Leydig Cell Tumor 1예

박건호,김현희,윤혜진,최재호,윤민선,백승삼,호정규,김경태 대한부인종양 콜포스코피학회 2003 Journal of Gynecologic Oncology Vol.14 No.1

Sertoli-Leydig cell tumor는 드문 성색간질성 종양으로 양측성의 소견은 1% 미만으로 드물고 low grade malignancy에 속한다. 재발은 드물다고 알려져 있는데, 2/3가 초기 치료 후 1년 이내에 발생되고 복강내부와 후복막 림프절이 재발의 호발부위이다. 조직학적 분화도가 나쁘고 retiform pattern과 tumor rupture인 경우 악성화의빈도가 높다고 알려져 있다. 치료는 젊은 여성의 경우 병기 I일 때에는 자궁과 임신기능을 보존하는 편측 난소난관절제술을 시행한다. 1기보다 높은 병기일 경우 전자궁적출술 및 양측난소난관절제술, 골반림프절 곽청술을 시행하고 항암화학요법을 시행하기도 한다. 저자 등은 악성전이를 한 양측성 Sertoli-Leydig cell tumor를 경험하였기에 간단한 문헌 고찰과 함께 보고하는 바이다. The Sertoli-Leydig cell tumor is a rare sex cord stromal tumor that has low grade malignancy and low bilateral occurrence rate. About two third of recurrence appears within 1 year after the initial treatment and most common recurrence sites are intraperitoneal cavity and retroperitoneal lymph nodes. The frequency of malignant transformation is high in the poor differentiated cell type, retiform pattern, and tumor rupture. In young women with stage I, unilateral salpingo-oophorectomy is performed to preserve uterus and reproductive function. In more advanced stages, hysterectomy, bilateral salpingo-oophorectomy, and pelvic lymph node dissection are performed and occasionally chemotherapy can be combined. We experienced a rare case of malignant metastasis in Sertoli-Leydig cell tumor, and presented with a brief review of literature.

野山開墾地에서 大豆에 대한 窒素施肥 方法이 諸形質變化 및 收量에 미치는 影響

朴建鎬 圓光大學校大學院 1984 學位論叢 Vol.13 No.-

For the increase of soybean yield in newly reclaimed area, this experiment was carried out in Kimje (plain area) and Jinan (hilly area) to determine the effect of nitrogen topdressing on agronomic characters. grain yields, protein and oil contents of soybean in 1982~1983. The results obtained were summarized as follows; 1. During growing period, average mean temperatures were similar, but amounts of rainfall and sunshine hours were smaller in Jinan than in Kirn je. 2. Applications of sufficient amounts of phosphates and lime increased available P20S and exchangeable Ca contents on both soils to optimum levels within one year after reclamation. 3. Days required for flowering (days from sowing to flowering) were shortened as sowing dates were later. 4. Nitrogen topdressing at flowering shortened the length of branches, but increased number of branches per plant, thus preventing over-thriving and lodging as compared with basal fertilization. 5. Nitrogen topdressing at flowering increased number of pods per plant and weight of 100 seeds. 6. Significant positive correlation were observed between grain yield and stem length, number of branches per plant, number of pods per plant, and weight of dry matter. 7. A significant negative correlation was obtained between grain yield without topdressing and yield increasing index by topdressing. The result indicates that nitrigen topdressing may be very effective practice III newly reclaimed area. 8. Soybean seeds produed in Jinan had higher protein contents than there of in Kimje. Higher protein contents in grains were noted with nitr ogen topdressing than without topdressing (only basal fertilization). Tendency of oil content was just opposite to above results of protein content. The protein content was significantly negative correlates with oil contents, regardless of area and varieties. 9. Total nitrogen content by Danyeobkong(medium type) plants was increased continuously until maturing stage, but that by Kwangkyo (limited type) plants showed the peak at 30 days after flowering. Total nitrogen content by plants at 30 days after flowering was significantly correlated with grain yield of soybeans. 10. The order of distribution ratio among plant parts in nitrogen content at maturing stage was mainstem < branch < pod < seed. The distribution ratio in seed was highest in the plants that receiving nitrogen topdressed at flowering. 11. Application of 8kg/l0a nitrogen as only basal fertilization inhibited formation of nodules in soybean roots, and nitrogen topdressing tended to decrease their sizes. 12. Topdressing of 4kg/10a nitrogen at flowering stage increased grain yields by 23-36% and 18-27% in Danyeobkong, and by 15-56% and 20-28% in Kwangkyo , III Kimje and Jinan respectively.

절연 파괴 특성을 이용한 에폭시 복합체의 절연 신뢰도 예측

박건호,이준웅 광운대학교 신기술연구소 1996 신기술연구소논문집 Vol.25 No.-

본 연구에서는 송배전 계통에서 변성기의 몰드 재료로서 널리 사용되고 있는 에폭시 수지를 시료로 하여 설정해 높은 배합비에 따라 5종으로 제작한 각 시편에 대해 절연 파괴 실험을 하였다. 절연파괴 데이터를 가지고 와이블 분포식을 이용하여 임의의 허용 파괴 확률에서의 허용인가 전계의 값을 추정하였으며 절연 안전성을 판단하기 위하여 경년 열화(經年劣化) 데이터의 통계 처리를 행한 결과 허용 파괴 확률을 0.1[%]로 하였을 때, 허용 인가 전계는 21.5[kV/mm] 이하가 되어야 함을 확인할 수 있었다. In this study, the dielectric breakdown of epoxy composites used for transformers was experimented and then its data were simulated by Weibull distribution probability. The more hardener increased the stronger breakdown strength at low temperature because of cross-linked density by the virtue of ester radical, and the breakdown strength of specimens with filler was lower than it of non-filler specimens because it is believed that the adding filler forms interface and charge is accumulated in it, therefore the molecular motility is raised, the electric field is concentrated, and the acceleration of electron and the growth of electron avalanche are early accomplished. From the analysis of Weibull distribution, it was confirmed that as the allowed breakdown probability was given by 0.1[%], the applied field value needed to be under 21.5[kV/mm].

사과문

박건호 로얄에이알씨 주식회사 2009 로얄동물임상의학 Vol.7 No.3