고온에서 HAN 계열 추진제 액적의 거동에 대한 연구

황창환(Chang Hwan Hwang),백승욱(Seung Wook Baek),한조영(Cho Young Han),김수겸(Su Kyum Kim),전형열(Hyung Yeol Jeon) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.45

The droplet behavior of 83.9 wt.% HAN water solution was investigated experimentally with various ambient temperature and nitrogen environment. At the initial stage of evaporation under thermal decomposition temperature of HAN, gradual decreasing of droplet diameter was observed. After that, the droplet started to expand due to the internal pressure build up by water nucleation inside the droplet. The micro explosion was observed at higher temperature than the decomposition temperature of HAN and the remaining droplet showed similar behavior of single composition droplet. The decreasing rate was augmented as the ambient temperature increasing.

야뇨증 환아들의 심리사회적 특성에 대한 다기관 연구 : 행동 및 정서 문제를 중심으로

조수철,김재원,신민섭,황준원,한상원,박관현,이상돈,김경도,김건석,서홍진,이유식,정재용,김영균,문두건,남궁미경,한창희,조원열,김영식,배기수,이종국,정우영,신의진 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.6

Objectives : The aim of this study was to examine the behavioral and emotional problems associated with nocturnal enuresis in Korean children. Methods : Three hundred eighteen children with nocturnal enuresis, together with their parents, completed the Child Behavior Checklist (CBCL), Disruptive Behavior Disorder Scale according to DSM-IV (DBDS), Children's Depression Inventory (CDI), State-Trait Anxiety Inventory for Children (STAIC), and Piers-Harris Children's Self-Concept Scale (PHCSC). Ninety-three normal students were selected as the control group. Results : Compared to the normal control group, the mean scores with regard to the withdrawn, social problems, attention problems, delinquent behavior, aggressive behavior, externalizing problems and total problems profiles were significantly higher in the nocturnal enuresis group according to the CBCL results. The nocturnal enuresis group also scored significantly higher in the ADHD and ODD profiles of the DBDS. The nocturnal enuresis group was more depressed and anxious than the control group according to the results of the CDI and STAI. The mean score of the PHCSC was significantly lower in the nocturnal enuresis group when compared to the normal control group. Conclusion : The results of this study suggest that children with nocturnal enuresis in Korea have clinically relevant behavioral and emotional problems. The findings support the link between nocturnal enuresis and psychopathology in Korean children.

노인의 팔 굽힘/폄 저항 운동 시 하중 증가에 따른 근육의 활성도 및 기여도 분석

김현동(Hyun Dong Kim),황성재(Sungjae Hwang),손종상(Jongsang Son),김한성(Han Sung Kim),김영호(Young Ho Kim) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.4

The purpose of this study was to assess activation and contribution of muscles of the elderly according to increased loading during the arm flexion extension resistance exercise. Surface electromyographic signals were acquired from biceps brachii, triceps brachii, deltoid posterior, pectoralis major and latissimmus dorsi to determine the difference of the activation of specific muscles between the elderly and young. Five elderly and five young males with no musculoskeletal disease volunteered for the study. Electromyographic activities in the muscles were measured during resistance exercise and normalized to the maximum EMG activity recorded in the maximal voluntary static contraction (MVC). Against the increased loading during arm flexion/extension resistance exercises, the young uses muscles evenly but the elderly uses one specific muscle frequently. Contribution of triceps brachii during extension and deltoid posterior during flexion was principal in the elderly.

대동맥 협착증과 동반된 출혈성 위장관 동정맥 기형에서 Estrogen-Progesterone 치료 1예

김도연,김화정,김효정,남준식,박수영,박영미,신정은,주미순,황민규,정혜경,손혜영,이선영,이한주 大韓消化器內視鏡學會 1999 Clinical Endoscopy Vol.19 No.부록2

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

적응 루프법을 이용한 진화적 구조 위상 최적설계

황승민,박재용,임민규,오영규,한석영 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

This paper presents a reliability-based topology optimization (RBTO) using bi-directional evolutionary structural optimization (BESO). Topology optimization is formulated as volume minimization problem with probabilistic displacement constraint. Young's modulus, external load and thickness are considered as uncertain variables. In order to compute reliability index, four methods, i.e., RIA, PMA, SLSV and ADL(adaptive-loop), are used. Reliability-based topology optimization design process is conducted to obtain optimal topology satisfying displacement and reliability index constraints with the above four methods, and then each result is compared with respect to numerical stability and computing time.

고흥반도 연안에 분포하는 浮遊性 卵·仔稚魚 종조성의 계절변동

한경호,신영호,황동식 한국어류학회 2002 韓國魚類學會誌 Vol.14 No.1

전라남도 고흥군 녹동연안에서 2000년에 계절별로 총 4회에 걸쳐 만조시 채집된 浮遊性 卵·仔種魚의 종조성 및 양적변동을 조사하였다. 조사기간 동안 채집된 浮遊性 卵은 총 8개 분류군이 출현하여 7개 분류군은 種 수준까지, 1개 분류군은 기타난으로 동정되었다. 그 중에선 멸치(Engraulis japonica)가 전체 출현량의 52.1%를 차지하여 가장 우점하였으며, 다음으로 기타난이 13.2%, 주둥치(Leiognat husnuchalis)가 12.3% 보리멸(Sillago sihama)이 8.6%, 앨퉁이(Maurolicus muelleri) 4.0%, 전어 (Konosirus punctatus) 1.0%, 참서대(Cynoglossus joyneri) 0.2%을 차지하였다. 仔種魚는 총 8目 26科 33屬 37개 분류군의 仔種魚가 출현하여,33개 분류군은 種 수준, 2개 분류군은 屬수준, 2개 분류군은 科 수준까지 동정되었다. 조사기간 동안 출현한 仔種魚 중에서 멸치가 31.7%를 차지하여 최우점하였으며, 망둑어科(Gobiidae)에 속하는 어류는 46.2%, 베도라치(Pholis nebulosa)와 실고기(Syngnathus schlegeli)는 각각 5.4%와 2.3%를 차지하였다. 조사기간 동안 출현한 仔種魚 중에서 이들 4개 분류군이 차지한 비율은 85.6%를 차지하였다. The ichthyoplankton were sampled during four different months (2000) to study their seasonal variations and species composition off Kohung Peninsula. During the study, the fish eggs were identified to eight taxa, seven of which were identified to species level, and one identified to order. The most dominant species. Engraulis japonicus, accounted for 52.1% of the total fish eggs, followed by Leiognathus nuchalis(4.0%), Sillago sihama(8.6%), Maurolicus muelleri(8.6%), Sardinops melanostictus(4.0%), Konosirus punctatus(1.0%), Cynoglossus joyneri(0.2%). The collected larvae and juveniles were identified to 37 taxa (33 genera, 26 families, 8 orders). Of these, 33 were identified to species level, and two were identified to genus and family level, respectively. The dominant species, Engraulis japonicus, accounted for 31.7% of the total larvae and juveniles; it was followed by Gobiidae(46.2%), Pholis nebulosa(5.4%) and Syngnathus schlegeli(2.3%). These four taxa constituted 85.6% of the total collected larvae and juveniles.

NHCF 막전극과 코발트 양이온간의 이온교환에 있어서 용액의 물성과 주사속도의 영향

한영,김은호,곽철,황영기 경남대학교 신소재연구소 1999 論文集 Vol.11 No.-

니켈 표면에 이온교환막을 생성시켜 NHCF 막전극을 제조하고, 순수한 니켈전극과 NHCF 막전극을 나트륨 용액에서 연속적으로 반복되는 순환전위곡선을 측정하였다. 이 곡선들로부터 순수한 니켈과 NHCF의 산화/환원 반응 특성을 분석하였다. 또한 NHCF 막전극을 코발트와 이온교환 반응시키면서 순환전위곡선을 측정하고, 이 곡선들로부터 산화/화원반응에 흐른 전기량을 산출하여 용액의 농도, 온도, pH, 그리고 전위 주사속도 등의 변화에 따른 영향을 조사하였다. NHCF 막전극은 화학적 방법보다 전기화학적 방법으로 제조할 경우에 안정적인 성능을 갖며, 전극전위 공급시간이 길수록 막전극의 이온교환 성능이 우수함을 알 수 있었다. NHCF 막전극은 코발트와 산화/환원할 때 중성 용액보다 산성 용액에서, 고농도보다 저농도에서 첨두전류, 흐른 전기량, 반응성이 높기 때문에 저농도의 폐수 처리에 효과적이다. 또한 20~60℃의 온도 범위에서 30℃인 경우에서 이온교환 성능이 가장 높고, 첨두전류는 주사속도의 0.7승에 비례 증가하였다. In this study NHCF film electrode was derivatized on the nickel surface by the chemical and electrochemical methods. The redox reaction of pure nickel and NHCF film electrode were investigated in 0.5 M NaNO₃solution by the cyclic voltammetry. We observed the effects of cobalt concentration. solution temperature, solution pH. and potential sweep rate on the charge passing through redox reaction. It was found that electrochemically derivatized NHCF film electrode was more effective to the ion exchange than chemically self-assembled film electrode. Peak current density, charge passing through redox reaction, and reactivity were higher when increasing the potentiated time for NHCF generation. They were also higher at acidic solution, at lower concentration of cobalt, and at 30 C among applied potential range of 20℃ to 60 C. Peak current density increased with the potential sweep rate by the magnitude of 0.7.

민어(Miichthys miiuy)의 卵發生過程 및 仔稚魚 발육단계에 따른 형태발달

한경호,오성현,황동식,조영현,서대철 한국어류학회 2002 韓國魚類學會誌 Vol.14 No.2

본 연구는 2000년 8월 19일 전라남도 신안군 임자도 연안에서 2각망으로 어획된 민어 어미를 인위적인 방법으로 수정하여 부화 사육하면서 관찰한 卵發生 過程 및 仔稚魚 형태변화는 다음과 같다. 1. 민어의 受精卵은 구형의 분리 부성난으로 알의 크기는 0.96~1.08㎜(평균 1.01㎜, n=50)였고, 크고 작은 油球가 1~5개(0.06~0.34㎜) 존재하였다. 2. 사육수온 25.2~28.4℃에서 受精 후 17시간 10분에는 배체가 卵膜을 뚫고 머리부터 孵化하기 시작하였다. 3. 孵化 직후 仔魚의 전장은 2.36~2.63㎜(평균 2.48㎜, n=10)로 전장의 45.0~47.0%에 달하는 큰 卵黃(장경 1.11~1.20㎜, 단경 0.92~0.96㎜)을 가지고 있으며 筋節은 7~8+ 17~19=24~27개였다. 4. 孵化 후 3일째 仔魚는 전장 3.98~4.32㎜(평균 4.16㎜, n=10)로 입은 열려있었고, 이 시기에 섭이활동이 활발하게 관찰되면서 卵黃이 완전히 흡수되어 後期仔魚期로 이행되었다. 5. 孵化 후 10일째 後期仔魚는 전장이 5.88~6.74㎜(평균 6.30㎜, n=10)로 꼬리의 말단이 굽어지기 시작하는 시기로 黑色素胞가 기저후두골 뒷부분의 체측에서 점모양 및 나뭇가지모양 으로 출현하였다. 6. 孵化 후 31일째 개체의 전장은 9.62~12.76㎜(평균 11.12㎜, n=10)로 모든 지느러미가 정수에 달하였고, 체형이나 반문이 成魚와 닮아 種魚期로 이행하였다. Egg development and morphological change of larvae of the brown croaker, Miichthys miiuy, were investigated after obtaining samples by artificial insemination. The spawning season extends from the middle to the end of August in the seas off Lim-ja Island, Cheollanam-do. The fertilized eggs were transparent, spherical, separate and they floated. Egg diameter ranged 0.96~1.08㎜ with several oil globules of 0.06~0.34㎜. Hatching occurred 17 hours 10 minutes after fertilization in 25.2~28.4℃ water temperature. The newly-hatched larvae were 2.36~2.63㎜(mean:2.48㎜, n=10) in total length(TL), had a large yolk, and 7~8+17~19=24~27 myotomes. Melanophores were distributed on the eye lens. Three days after hatching the larvae had attained 3.98~4.32㎜ in TL(mean:4.16㎜, n=10), the yolk sac was completely absorbed, and they had transformed into the postlarva stage. The larva reached the juvenile stage with all fins formed and with a complete set of fin rays(D.Ⅹ-28~31;A.Ⅱ-7~8;P. 21~23;C. 19~21;V. 25~26) on the 31st day after hatching. The juveniles were 9.62~12.76㎜(mean:11.12㎜, n=10) in total length. At this point the juvenile was similar to the adult in body form and pigmentation pattern.

CAS 세멘트 제조에 관한 기초연구

황용길,윤한중 東亞大學校 1998 東亞論叢 Vol.35 No.-

The experimental results of synthesized expansive sttringites with aqueous solution of aluminumsulphate and milk of lime are as follows. 1) The synthesized reactions are progressed toward exothermic reaction rapidly. 2) Compared to crystallizing H₂O content of the synthesized 3Cao·Al₂O₃·3CaSO₄·xH₂O, diluted aqueous solutions is less than conc aqueous solution. 3) The crystal forms of synthetic ettringite are observed to spherical and column forms by SEM. 4) By the results of XRD analysis, ettringites contained below 6 mols CaO appeared to CaSO₄ but in the 7 and 8 mols CaO contained ettringites obtained CaSO₄and free CaO. 5) The expansibility and water absorption rate of 6 and 7 mols CaO contained ettringites are excellent.