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.

태권도 선수들의 운동 만족이 정신건강 및 생활 만족에 미치는 영향

한권상,손창남,임상호,류경희,장지현,김태우 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.4

The purpose of this study is to determine how a Taekwondo player's athletic satisfaction affects his/her psychological health and overall personal happiness. A questionnaire survey was carried out on a sample group of 200 students attending colleges located in Seoul and Gyeonggi Province. Then, 23 questionaries deemed not trustworthy were eliminated, leaving 178 questionaries for analysis. The questionnaire, which contained total 128 questions, showed the confidence level falling between .5241 and .8945 (Cronbach's alpha). The study, which relied on frequency analysis, t-test, One-way ANOVA, and Scheffe test, produced the following results. First, athletic satisfaction showed a statistically significant difference (5% range) depending on sex, school year or athletic experience. Second, psychological health resulted in a statistically significant difference (5% range) depending on sex or athletic experience while no difference was noticed regarding school year. Third, happiness in life showed a statistically significant difference (5% range) depending on sex or school year while no difference was noticed with regard to athletic experience.

과립세포종 ( Granular cell tumor )

류지호 ( Ji Ho Ryou ),최재영 ( Jae Young Choi ),이무형 ( Mu Hyoung Lee ) 대한피부과학회 1996 대한피부과학회지 Vol.34 No.5

Granular cell tumors were originally described in 1926 by Abrikossoff as myoblastic myomas. They usually occur as solitary tumors but can be multiple in about 10% of cases. They have a predilection for the head, neck and tongue, but also occur in many other organs. Authors experienced a 37 year-old male patient with a granular cell tumor which exhibited the distinctive histopathologic appearance on light microscopy and electromicroscopy. Also, granular cells were S-100 protein, vimentin and CD68 immunoreactive, but desmin and GFAP showed negative immunostaining. This finding suggests a neural origin for grenular cell tumors. (Kor J Dermatol 1996;34~(5): 861-864)

고정약진의 임상 및 병리조직학적 고찰

류지호 ( Ji Ho Ryou ),김진환 ( Jin Hwan Kim ),이무형 ( Mu Hyoung Lee ) 대한피부과학회 1998 대한피부과학회지 Vol.36 No.1

Background: Fixed drug eruptions(FDE) are a cutaneous reaction characterized by one or more circumscribed lesions that recur at the same site in response to a given medication. Objective: The purpose of this study was to find the clinical and histopathological characteristics of FDE and to compare early FDE with late FDE histopathologically. Method: We clinically investigated 54 cases of FDE that visited the department of dermatology at the Kyunghee medical center from January 1993 to December 1996. Among them, 31 patients had skin biopsies and were evaluated histopathologically on the basis of duration. Results .' The results were summarized as follows: 1. Development of FDE did not show any difference according to sex and was evenly distributed over all the ages. 2. The latent periods of FDE were diverse in appearance from 30 minutes to 10 days, but mostly, the skin lesions erupted within 4S hours. 3. The most common skin lesions were erythematous macules. 4. Distribution of the lesions came out as solitary : 20.4%, multiple : 79.6%. S3.7% of the multiple lesions were localized to a part of body, and 16.3% were distributed over the whole body. 5. The areas in which the eruptions developed were (in descending order): upper extremity(37.0%), hand(31.5%), trunk(24.1%), face(24.1%). 6. In most cases(68.6%), the size and the number of lesions were greater in recurrente, rather than in first attacks. 7. The histopathological findings commonly showed perivascular mononuclear cell(MNC) infiltration (100%), pigmentary incontinence(77.4%), basal hydrophic degeneration(71.0%), eosinophil infiltration in dermis(61.3%), etc. 8. The epidermal histopathological findings such as spongiosis, exocytosis of MNC, basal hydrophic degeneration, keratinocyte necrosis and subepidermal vesicles could be seen more frequently in early lesions than in late ones. Conclusion : In our study, we were able to obtain meaningful results based on data from the combination of clinical and histopathological investigations. This study may give help to understand the characteristics of fixed drug eruptions and to plan future studies. (Korean J Dermatol 1998;36(1): 30-36)

피부에 전이된 소세포성 폐암 2예

류지호 ( Ji Ho Ryou ),전범진 ( Bum Jin Juhn ),이무형 ( Mu Hyoung Lee ) 대한피부과학회 1998 대한피부과학회지 Vol.36 No.2

The frequency of metastasis to the skin from lung cancer is 1-12%. The incidence of cutaneous metastasis was high in patients with large-cell lung cancer, whereas squamous cell and small-cell lung cancer showed the least tendency to extend to cutaneous sites. Adenocarcinoma was intermediate in the tendency to metastasize in the skin. Histological findings of small-cell lung cancer show solid, tumor cell nests composed of neoplastic cells with large, round nuclei. So, it is often difficult to distinguish small-cell lung cancer from other poorly differentiated small-cell tumors, such as Merkel cell carcinoma, metastatic carcinoid, lymphoma, etc. We report here two cases of skin metastasis from small-cell lung cancer. Case one was a 74-year-old man presenting with a single, round, dome-shaped nodule on the alar nasi which had been present for 1 month. The second case was a 73-year-old man who had found three, non-tender, freely movable subcutaneous nodules on the abdomen 3 days before. Both cases were diagnosed as small-cell lung cancer. On histopathological examination of the skin lesions, we could observe that small round to oval cells with dark staining nuclei and scant cytoplasms were arranged in anastomosing trabecular streams through the dermis, separated by strands of connective tissue in both cases. In the first case, the tumor cells were positive to cytokeratin and NSE, negative to neurofilament antiagen and LCA. (Korean J Dermatol 1998;36(2): 308-312)

Elasto-Plastic Analysis of the Impact Performance of Woven Fabric Composites

Ryou, Hansun,Kim, Ji Hoon,Joo, Ki Ho,Chung, Kwansoo,Youn, Jae Ryoun,Kang, Tae Jin SAGE Publications 2007 Polymers & polymer composites Vol.15 No.4

Combination Treatment Using Roller-Clamp & Edged Multihole Cannula for Osmidrosis & Hyperhidrosis

( Ho Chan Son ),( Dong Hye Suh ),( Ga Yeoun Jang ),( Ji Ho Ryou ),( Sang Jun Lee ) 대한피부과학회 2005 초록집 Vol.43 No.10

Functionalized graphene for high performance lithium ion capacitors.

Lee, Ji Hoon,Shin, Weon Ho,Ryou, Myung-Hyun,Jin, Jae Kyu,Kim, Junhyung,Choi, Jang Wook Wiley-VCH 2012 CHEM SUS CHEM Vol.5 No.12

<P>Lithium ion capacitors (LICs) have recently drawn considerable attention because they utilize the advantages of supercapacitors (high power) and lithium ion batteries (high energy). However, the energy densities of conventional LICs, which consist of a pair of graphite and activated carbon electrodes, are limited by the small capacities of the activated carbon cathodes. To overcome this limitation, we have engaged urea-reduced graphene oxide. The amide functional groups generated during the urea reduction facilitate the enolization processes for reversible Li binding, which improves the specific capacity by 37 % compared to those of conventional systems such as activated carbon and hydrazine-reduced graphene oxide. Utilizing the increased Li binding capability, when evaluated based on the mass of the active materials on both sides, the LICs based on urea-reduced graphene oxide deliver a specific energy density of approximately 106 Wh kg(total) (-1) and a specific power density of approximately 4200 W kg(total) (-1) with perfect capacity retention up to 1000 cycles. These values are far superior to those of previously reported LICs and supercapacitors, which suggests that appropriately treated graphene can be a promising electrode material for LICs.</P>

H2SO4 Chemical 공급장치 내 배관 중성화 Flushing 방안 연구

현지태(Ji-Tae Hyeon),박호연(Ho-Yeon Park),류충렬(Choong-Ryul Ryou) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.11

본 논문에서는 H2SO4 Chemical의 배관 중성화 Flushing 방안에 대해 새로운 접근으로 비눗물을 이용하여 기존보다 효율적인 중성화 Flushing 방안을 확인하였다. 기존 DIW(De-Ionized Water : 초순수물)를 이용한 Flushing 방안은 중성화 진행 속도가 현저히 늦고, 작업 간 Chemical 접액 및 Fume에 노출되기 쉬운 문제점이 있다. 기존 방안과 비눗물을 이용한 중성화 진행 차이를 비교하고 실제 배관 내의 중성화 정도를 확인하여, H2SO4 Chemical 공급장치 내 배관 중성화 Flushing의 환경안전 측면 개선과 작업 간 업무량 및 Risk를 감소시켜 효율적인 중성화 Flushing 방안 수립에 기여하고자 한다. In this paper, we try a new approach to the neutralization flushing method of H2SO4 Chemical used in the semiconductor manufacturing process. By comparing the difference with DIW by using soapy water instead of DIW (De-Ionized Water: ultrapure water) for neutralizing piping and checking the degree of neutralization in the actual piping, improvement of environmental safety aspects between piping neutralization and flushing in the H2SO4 chemical supply device and It aims to contribute to the establishment of an efficient neutralization flushing plan by reducing the workload and risk between neutralization operations..

Mechanical Analysis of Woven Composites at High Strain Rates and Its Application to Predicting Impact Behavior

( Han Sun Ryou ),( Kwan Soo Chung ),( Ji Ho Lim ) 대한금속재료학회 ( 구 대한금속학회 ) 2008 METALS AND MATERIALS International Vol.14 No.6

The deformation behavior of woven composites at high strain rates was analyzed using a constitutive equation developed to describe the nonlinear, anisotropic/asymmetric and rate-dependent mechanical behavior of woven composites. The rate-dependent nonlinear behavior of woven composites was characterized at high strain rates (1 s-1 to 100 s-1) using a tensile testing method first proposed in this research. The material properties for the developed constitutive equation were determined and subsequently used in a finite element analysis of the deformation behavior of woven composites at high strain rates. Finally, the impact behavior of woven composites was predicted using the constitutive equation and the results were compared with experiments, showing that the current constitutive equation including the characterization method is adequate to describe the deformation behavior of woven composites at high strain rates up to impact level.