중부지역 옥수수 파종기에 따른 생육단계 및 수량성 변화

서종호, 문중경, 정건호, 서민정, 구자환, 박장환, 배환희, 신성휴, 권영업 忠北大學校 農業科學硏究所 2014 農業科學硏究 Vol.30 No.2

Maize hybrids were planted on April 1, April 25, May 20 and June 15 in 2012, 2013 at the experimental paddy and upland fields in Suwon city , respectively to know changes of growth stage and yield according to different planting time. Maize planting on April 1 was not recommended because total growing days at planting on April 1 was not different with that at planting on April 25 due to many days from planting to emergence over 20 days at planting on April 1. Total growing days were not much different among three planting time after April 25 because days from silking to maturity was lengthened though days from planting to silking was shortened at later planting time. Stalk weight was decreased as planting time was delayed, particularly at planting times after May 20 at paddy field by excess water injury during early growth stage. But, grain yield was not low as in May and June. It is needed to introduce early maturity maize variety as Yanganok at late planting for higher grain yield and enough time for soil preparation for next winter crops

AISI D2강 위에 다층으로 증착된 WC-Ti_(1-X)Al_(X)N 코팅의 국부부식 거동에 관한 연구

안승호,이정호,김호건,김정구,한전건 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.9

Multilayered WC-Ti_(1-x)Al_(x)N coatings are characterized by periodically repeated structures of lamellae of WC-Ti/WC-Ti_(1-x)Al_(x)N. WC-Ti_(1-x)Al_(x)N coatings of changing Al concentration were deposited on AISI D2 steel by high-ionization sputtered plasma vapor deposition (PVD). The Al concentration could be controlled by using evaporation source for Al and fixing the evaporating rate of other metals. Four kinds of WC-Ti_(1-x)Al_(x)N coatings were prepared: WC-Ti_(0.6)Al_(0.4)N, WC-Ti_(0.53)Al_(0.47)N, WC-Ti_(0.5)Al_(0.5)N and WC-Ti_(0.43)Al_(0.57)N. The corrosion behavior of WC-Ti_(1-x)Al_(x)N coatings was investigated using electrochemical techniques in deaerated 3.5% NaCl electrolyte (galvanic corrosion test, potentiodynamic polarization test, electrochemical impedance spectroscopy and Mott-Schottky method) and surface analyses (GDOES, SEM and EDS). Particular attention was paid to the effect of growth defects on the coating properties related to the corrosion behavior. The results of the coating and substrate galvanic corrosion test showed low galvanic current densities. In the potentiodynamic polarization test and EIS measurement, the corrosion current density of WC-Ti_(0.5)Al_(0.5)N was lower than others and presented higher R_(ct) values than others after 240 h immersion time. This could be attributed to the formation of a Ti oxide, which promotes partial closing of the defects. Capacitance values obtained from EIS as a function of different potentials (C^(-2) vs E) showed that the oxide layer exhibited an n-type semiconductor behavior.

비행 대 비행 하중스펙트럼 하에서 균열닫힘 효과를 고려한 리벳연결 보강박판구조의 피로균열성장거동에 관한 연구

정건교,권정호 울산대학교 2001 공학연구논문집 Vol.32 No.1

항공기 구조는 기능적 특성상 주구조의 대부분이 보강박판으로 이루어져 있으며 이러한 리벳연결 보강박판구조의 손상허용성(damage tolerance) 평가는 설계해석에서 필수적인 과제라고 할 수 있다. 손상허용성에 대한 구조적 건전성을 평가하기 위하여 비행하중스펙트럼 하에서 정확한 피로균열 성장수명 분석이 우선적으로 요구된다. 본 논문에서는 비행 대비행 하중스펙트럼 하에서 중앙균열을 가진 리벳연결 보강박판구조의 균열성장 거동을 예측하기 위하여 기존의 응력강도 해석에 소성유도 균열닫힘 모델인 Strip-yield 모델을 활용하여 보다 개선된 균열성장수명 해석을 시도하였다. 또한 응력강도 해석과 균열성장 해석과정을 연계시켜 전산프로그램화 하여 불규칙 변동하중 하에서 보강박판의 균열성장 수명해석을 효과적으로 수행하도록 하였다. 또한 보강박판 시험편구조에 대하여 균열성장수명 계산을 수행하고 계산결과와 시험결과를 비교 분석함으로써 개선된 결과를 확인하였다. It is required precise fatigue crack growth prediction to evaluate structural integrity for damage tolerance under flight load spectrum. In this paper, for predicting crack growth behaviour of riveted stiffened sheet with center crack under flight-by-flight load spectrum, it was performed to evaluate crack growth life with the effect of crack closure on the basis of strip-yield model. It was also carried out the crack growth life calculation and compared with experimental test results for the stiffened sheet specimen structure that consists of 2024-T3 aluminum alloy skin and 2024-T3 aluminum alloy stiffener.

편마비 환자의 정상측과 마비측의 비복근 운동점에서의 근육 두께 차이

김동건,도현경,김현동,황지선,정규영,정호중 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.1

Objective : To investigate any difference of muscle thickness in the motor points of the gastrocnemius between the paretic and non-paretic legs in hemiplegics. Method : Ultrasonography was used to assess in vivo the gastrocnemius muscle thickness at the motor points in the paretic and non-paretic legs of twenty-four patients with stroke. Results : Muscle thickness at the motor points were reduced in the paretic legs compared to the non-paretic legs (p<0.05). There was no correlation between muscle thickness and duration of hemiplegia, site of hemiplegia. However, it did not take regular pattern of the muscular atrophy in the paretic legs. Conclusion : The gastrocnemius muscle of the paretic leg had smaller thickness compared with the non-paretic leg. The present results indicate that paresis in hemiplegics may affect the accuracy of intramuscular injection of botulinum toxin A. Therefore, we recommend ultrasonography for visually controlled, anatomically precise injection of botulinum toxins.

인공고관절용 스테인리스강 316L에 증착된 다이아몬드상 카본 필름의 전기화학적 특성에 관한 연구

김호건,안승호,김정구,박세준,이광렬 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.4

Diamond-like carbon (DLC) films have several advantages in applications such as high hardness, chemical inertness, low friction and electrical insulation. Furthermore, DLC-coated STS 316L films have been reported to have a good biocompatibility, such as the absence of inflammatory response. Thus, corrosion resistance is the first consideration for the biomaterials to be used in the body. DLC films have been deposited onto substrates of STB 316L for artificial hip joints using r.f PACVD (plasma-assisted chemical vapor deposition) with C_(6)H_(6) and mixture of C_(6)H_(6) and SiH_(4) as the process gases. Three kinds of DLC-coated films were prepared as a function of diverse bias voltage and Si incorporation. Corrosion behavior of DLC films was investigated by electrochemical techniques (potentiodynamic polarization test and electrochemical impedance spectroscopy) and surface analyses (atomic force microscopy and scanning electron microscopy). The electrolyte used in his test was a 0.89%NaCl solution of pH 7.4 at temperature 37℃. Electrochemical measurements showed that DLC films with higher bias voltage and Si incorporation could improve corrosion resistance in the simulated body fluid environment. (Received December 5, 2003)

Properties of Glucose Isomerase from Arthrobacter sp. L-3

방병호,남궁석,이정윤,윤은숙,이상건,이은숙 서울保健大學 1991 論文集 Vol.11 No.1

생체모사환경에서 DLC 필름의 부식마모 특성에 미치는 Si 함량의 영향에 관한 연구

김호건,김우중,김정구,박세준,이광렬 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.3

In a method to improve resistance to wear, corrosion and mechanical properties of protective coating, DLC coatings have been extensively studied over the past several years due to their unique combination of properties. Especially, Si-DLC coatings have been attracting increasing interest of researchers since they have a great potential for solving some of the major disadvantages of pure DLC coatings. Si-incorporated diamond-like carbon (Si-DLC) coatings ranging from 0 to 2 at.% were deposited on Ti alloy substrate by means of r.f. plasma-assisted chemical vapor deposition (r.f. PACVD) technique, using mixtures of benzene (C_(6)H_(6)) and silane (SiH_(4)) as the reaction gases. Corrosion and wear behavior of DLC coatings was investigated by electrochemical techniques (potentiodynamic polarization test and electrochemical impedance spectroscopy), tribological techchnique(wear test) and surface analyses (atomic force microscopy, scanning electron microscopy and Raman spectroscopy). It was found that DLC coatings with increasing Si content could acquire improved corrosion and wear resistance in the simulated body fluid environment (0.89 wt.% NaCl of pH 7.4 at 37℃). (Received December 6, 2004)

급성 허혈성 뇌경색 발생시간의 일내 주기 변화

임건한,김진호,정원영 조선의대 1996 The Medical Journal of Chosun University Vol.21 No.2

뽕잎분말 첨가비율에 따른 쌀다식의 관능평가 및 영양성분 함량변화에 관한 연구

김애정,이건순,여정숙,김영호 혜전대학 식품산업연구소 2002 식품산업연구지 Vol.3 No.-

This study was carried out in order to investigate the study on the change of nutrient contents and sensory evaluation in rice Dasik according to the added level of mulberry leaf powder. The results are summarised as follows; 1. According to sensory evaluation, rice Dasik added mulberry leaf powder 2% showed higher level of appearance, color, flavor than other group. 2. With increasing mulberry leaf powder, crude protein, moisture and crude ash contents were significantly increased. The contents of crude fat was decreased with increasing mulberry leaf powder. 3. Ca, P, K and Mg contents of mulberry leaf powder 1%, 2%, 3%, 4% was higher than mulberry leaf powder free group.

동종 조혈모세포이식 후 발생한 크립토콕쿠스 척추염 1예

고윤호,임동준,이성수,조유경,이동건,최정현,김유진,민창기,김동욱,박정미,김춘추,신완식 대한감염학회 2001 감염 Vol.33 No.4

Skeletal cryptococcosis is an uncommon infection. Cryptococcus is a common cause of meningitis and infects 7∼10% of patients with AIDS. As well as AIDS, the infection may be seen in association with leukemia, lymphoma, Hodgkin's disease, sarcoidosis, tuberculosis and diabetes, also in patients on steroid medication. But there is no case report of skeletal cryptococcosis following allogeneic hematopoietic stem cell transplantation. A 40-year-old woman was admitted to the hospital because of low back pain. She had chronic myelogenous leukemia for 2 years and underwent allogeneic hematopoietic stem cell transplantation 8 months ago. She have been treated with steroid and cyclosporine orally because of chronic graft versus host disease. On examination she was afebrile and had posterior lower lumbar tenderness. But, she had no reduced strength of low extremities. Open biopsy was underwent. Histology demonstrated budding, round-to-oval, refractile yeast-like organisms within debris. The results of a lumbar puncture were unremarkable and cerebrospinal fluid culture failed to grow bacteria and yeast. The patient was treated with amphotericin B (1 gram) and AmBisome□ (2.8 gram) over 6 weeks. Three months after cessation of therapy, the patient was doing well.(Korean J Infect Dis 33:298∼301, 2001)