최씨 훅을 이용한 복강경 버찌씨 수술

김영혜 ( Young Hye Kim ),박준선 ( Jun Seon Park ),최상준 ( Sang Joon Choi ),송창훈 ( Chang Hoon Song ),한세준 ( Sei Jun Han ),정혁 ( Hyuk Jung ) 대한산부인과학회 2006 Obstetrics & Gynecology Science Vol.49 No.6

목적: 버찌씨 수술은 복압성 요실금 수술에 효과적인 수술로 여겨져 왔다. 요실금의 원인이 내인성 요도 괄약근의 결손소견 없이 요도의 과운동성으로 인한 경우 버찌씨 수술이 일반적으로 추천되어진다. 본 연구에서는 복강경 버찌씨 수술에서 최씨 훅의 유용성에 대해 알아보고자 하였다. 연구방법: 2000년 10월부터 2005년 3월까지 본원에서 복강경 버찌씨 수술을 시행받은 47명의 환자를 대상으로 하였다. 27명은 고전적 복강경 버찌씨 수술을 시행하였고 20명은 내골반 근막을 Cooper 인대를 부착하는데 유용한 본원에서 고안한 최씨 훅을 이용하여 복강경 버찌씨 수술을 시행하였다. 결과: 고전적 복강경 버찌씨 수술을 시행한 군과 최씨 훅을 이용한 복강경 버찌씨 수술을 시행한 군의 평균 나이, 분만력, 폐경률, BMI는 두 군간에 통계학적으로 유의한 차이를 보이지 않았다 (p>0.05). 수술 시간은 고전적 복강경 버찌씨 수술은 90.52±15.32분, 최씨 훅을 이용한 복강경 버찌씨 수술은 38.50±10.14분으로 최씨 훅을 이용한 경우 수술시간이 통계적으로 유의하게 짧았다 (p<0.05). 두 군간에 재발률 및 합병증 발생은 통계적 유의성을 보이지 않았다 (p>0.05). 결론: 본 연구에서 본원에서 고안한 최씨 훅을 이용하여 복강경 버찌씨 수술을 시행한 결과 수술 시간을 단축시킬 수 있었으며 수술 효과는 기존 방법과 동일하게 관찰되었다. 이에 최씨 훅은 복강경 버찌씨 수술에서 사용할 때 집도자의 봉합 과정을 단순화시켜 수술 시간을 단축시키므로 복강경 버찌씨 수술에 용이한 기구이다. Objective: Burch operation has been effective method for the treatment of stress incontinence. Burch operation is a well-accepted procedure for treating stress urinary incontinence secondary to urethral hypermobility without intrinsic sphincter deficiency and is the reference standard with which other procedures are compared. This study is to evaluate the effectiveness of the Choi`s hook in laparoscopic Burch operation. Methods: This study included 47 patients who had undergone laparoscopic Burch operation from October 2000 through March 2005. Of these 47 patients, 27 patients underwent traditional laparoscopic Burch operation (Group 1) and 20 patients underwent laparoscopic Burch operation with Choi`s Hook on anchoring the endopelvic fascia to the Cooper`s ligament (Group 2). Results: The mean age of patients of Group 1 was 55.6±9.37 years of age and that of Group 2 was 56.0±5.93 years of age. There is no difference in the mean age of patients (P>0.05). The mean operating time was 90.5±15.32 minutes for Group 1 and 38.5±10.14 minute for Group 2. The mean operating time was shorter in Group 2 than Group 1 (P<0.05). There was no difference in recurrence rate and complication rate between Group 1 and Group 2 (P>0.05). Conclusion: We performed laparoscopic Burch operation with the Choi`s Hook on anchoring the endopelvic fascia to the Cooper`s ligament. When we compared traditional laparoscopic Burch operation with laparoscopic Burch operation with Choi`s Hook, we could shorten the operation time using the Choi`s Hook.

Design optimization for mixed-flow pump impeller by improved suction performance and efficiency with variables of specific speeds

Sung Kim,Yong-In Kim,Jin-Hyuk Kim,Young-Seok Choi 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.6

In this study, the shape of a mixed-flow pump impeller and its flow characteristics as a function of the specific speed are studied to improve its suction performance and efficiency. The shapes of mixed-flow pump impellers show a trend based on the specific speed. To construct the optimum database, a mixed-flow pump impeller with a specified specific speed is optimally designed using computational fluid dynamics (CFD) and design of experiment (DOE). The design variables of the impeller are defined in the meridional plane and vane plane development for impeller. By analyzing the trends of different mixed-flow pump impeller shapes, the optimized shape that satisfies the design specification can be designed easily. The trend exhibited by the design variables depending on the specific speed is analyzed using the shape of the optimally designed mixed-flow pump impeller. The shape of the mixed-flow pump impeller, as per the required design specification, is designed using the trends of the design variables based on the specific speed. The performance of the designed model is verified using CFD and experimental test.

A lipid mixture enriched by ceramide NP with fatty acids of diverse chain lengths contributes to restore the skin barrier function impaired by topical corticosteroid

( Sung Ha Lim ),( Eun Jung Kim ),( Chung Hyuk Lee ),( Gi Hyun Park ),( Kang Min Yoo ),( Sung Ju Nam ),( Kyong-oh Shin ),( Kyungho Park ),( Eung Ho Choi ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1

Background: The stratum corneum (SC) consists of corneocytes, intercellular lipids, and corneodesmosomes. Most of the previous studies have focused on a ceramide with a single chain fatty acid, not with diverse chain lengths. Objective: We evaluated whether a lipid mixture enriched by ceramide NP with fatty acids of diverse chain lengths can restore the skin barrier impaired by topical corticosteroid. Methods: 27 healthy adult males were recruited. Topical corticosteroid was applied on both the forearms and, either the test cream that contains a lipid mixture or a vehicle cream was applied on the left or right forearm, respectively. The functional parameters of the skin barrier, epidermal differentiation markers, hyaluronic acid synthase 3 (HAS3), cytokines, and the lipid profiles in the SC were analyzed. Results: The barrier recovery rate, SC integrity, and SC hydration were significantly improved in the test cream-applied site. Filaggrin and HAS3 levels were significantly higher, Interleukin-1α (IL-1α) levels were increased, and IL-2, IL-6, IL-10, and IL-13 levels decreased in the test cream-applied site. Lipid analysis showed that C18, C20, and total ceramide NP levels increased in the test cream-applied site. C16, C18, C20, C24, and total ceramide NP levels were elevated in the test cream-applied site after acute barrier disruption. Conclusion: A lipid mixture enriched by ceramide NP with fatty acids of diverse chain lengths could recover the barrier impaired by topical corticosteroid.

Identification of Swine Hepatitis E Virus and Prevalence of Anti - HEV Antibodies in Swine and Human Populations

(Hyuk Joon Kwon),(Na Ri Shin),(Han Sang Yoo),최인수(In Soo Choi) 대한보건협회 2002 대한보건협회 보건종합학술대회 Vol.- No.-

Prevalence and Clinical Characteristics of the Metabolic Syndrome in Middle-Aged Korean Adults

( Hyuk Sang Kwon ),( Yong Moon Park ),( Hye Jung Lee ),( Jin Hee Lee ),( Yoon Hee Choi ),( Seung Hyun Ko ),( Jung Min Lee ),( Sung Rae Kim ),( So Young Kang ),( Won Chul Lee ),( Myung Sook Ahn ),( Jae 대한내과학회 2005 The Korean Journal of Internal Medicine Vol.20 No.4

Background : The aim of this study was to analyze the prevalence and clinical characteristic of the metabolic syndrome of adults, over 40 years old, living in Korea. Methods : This study was carried out for 2 years, 2003-2004, on total 5,330 individuals (2,197 men and 3,133 women) selected by the stratified random cluster sampling among adults over 40 years old. Metabolic syndrome was defined based on both the NCEP-ATP III criteria and Modified ATP III criteria applying the WHO-APR (Asian Pacific Region)`s abdominal obesity criteria (waist circumference > 90 cm in men, 80 cm in women) instead of NCEP-ATP III criteria. Results : Using NCEP-ATP III criteria, the age-adjusted overall prevalence of metabolic syndrome was 24.8% (17.6% in men, 30.0% in women). Age-adjusted overall prevalence of metabolic syndrome as defined by modified-ATP III criteria was 34.3% (26.3% in men, 40.1% in women). The prevalence of metabolic syndrome for each age group (40-49, 50-59, 60-69, ≥ 70) in men was as follows: 18.8%, 17.4%, 18.3%, 14.5%. In women: 22.3%, 32.7%, 39.9%, 39.3%. The prevalence of hypertriglyceridemia (triglycerides ≥ 1.7 mmol/l) was well correlated with the changing pattern of the prevalence of metabolic syndrome both in men and women. Conclusions : The peak age of metabolic syndrome in men was age 40 through 49, and the prevalence decreased with aging. Therefore, early intervention for risk factors of metabolic syndrome might be required in men. On the other hand, prevention for cardiovascular disease will be needed for perimenopausal women due to considerably increased prevalence in the age 50 through 59.

Fabrication of Ordered Nanostructured Arrays Using Poly(dimethylsiloxane) Replica Molds Based on Three-Dimensional Colloidal Crystals

Choi, Hong Kyoon,Kim, Mun Ho,Im, Sang Hyuk,Park, O Ok WILEY-VCH Verlag 2009 Advanced Functional Materials Vol.19 No.10

<P>Hexagonally arrayed structures of colloidal crystals with uniform surface are a good candidate for master molds to be used in soft lithography. Here, the fabrication of periodically arrayed nanostructures using poly(dimethylsiloxane) (PDMS) molds based on three-dimensionally (3D) ordered colloidal crystals is reported. A robust, high-quality 3D colloidal-crystal master molds is prepared using the colloidal suspension containing a water-soluble polymer. The surface patterns of the 3D colloidal crystals can then be transferred onto a polymer film via soft lithography, by means of the replication of the surface pattern with PDMS. Various hexagonally arrayed nanostructure patterns can be fabricated, including close-packed and non-close-packed 2D arrays and honeycomb structures by the structural modification of the 3D colloidal-crystal templates. The replicated hexagonally arrayed structures can also be used as templates for producing colloidal crystals with 2D superlattices.</P> <B>Graphic Abstract</B> <P>Various polymeric nanopatterns are fabricated using poly(dimethylsiloxane) replica molds based on high-quality 3D colloidal crystals. Close-packed, non-close-packed, honeycomb-shaped, and superlattice colloidal-crystal patterns are obtained by replicating surface-modified 3D colloidal-crystal master molds (see figure). <img src='wiley_img/1616301X-2009-19-10-ADFM200801096-content.gif' alt='wiley_img/1616301X-2009-19-10-ADFM200801096-content'> </P>

A Study on the methane production of the High Concentration Organic Wastewater Injection into Stabilized MSW Lysimeters

( Sang-yeop Lee ),( Dong-hoon Lee ),( Dong-hyuk Choi ),( Korea Kyeong-ho Lee ) 한국폐기물자원순환학회 2011 ISWA Vol.2011 No.0

Different Oxygen Transmission Rate Packing Films During Modified Atmosphere Storage : Effects on Asparagus Spear Quality

Hyuk Sung Yoon,In-Lee Choi,Ho-Min Kang 한국원예학회 2017 원예과학기술지 Vol.35 No.3

The aim of this study was to determine suitable oxygen transmission rate (OTR) films for modified atmosphere (MA) storage of asparagus spears (Asparagus officinalis L.), and to examine the related changes in asparagus spear quality. Asparagus spears were packed with 10,000, 20,000, 40,000, 70,000, and 100,000 ㏄/㎡·day·atm OTR film treatments for MA storage, and perforated film (conventional storage) was used as the control. The fresh weight loss rate was less than 1% in all OTR film treatments but not in the control. In all OTR film treatments, ethylene content rapidly increased on the first day of storage, and gradually decreased thereafter to 2.0 μL·L<SUP>-1</SUP> by the final storage day. In the 10,000 ㏄ and 20,000 ㏄ OTR film treatments, carbon dioxide content was maintained within the permissible range for asparagus spears under recommended controlled atmosphere (CA) and MA conditions (5-12%). The oxygen content was maintained between 12% and 20% in all OTR film treatments. Hue angles and total chlorophyll content were highest in the 10,000 ㏄ OTR film treatment in both tips and stems. Visual quality was maintained at a saleable level only in the 10,000 ㏄ OTR film treatment until the final storage day (25 days). Based on sensory evaluation, the least off-odor was detected in the 10,000 ㏄ OTR film treatment, and the most in the control treatment. While the soluble solids content decreased with all film treatments, it was maintained at the highest level in the 10,000 ㏄ OTR film treatment. Vitamin C content decreased with all film treatments during storage, but was maintained at higher levels in the 10,000, 20,000, and 40,000 ㏄ OTR film treatments. The firmness of tips and stems increased with storage duration in all film treatments, stems were firmer under the perforated film, 10,000, and 20,000 ㏄ OTR film treatments. Given these results, the 10,000 ㏄ OTR film treatment is considered the most appropriate for MA asparagus spear storage since visual quality and soluble solids content were maintained, and fresh weight loss, vitamin C content, off-odor, and yellowing were suppressed during storage.

ON A CLASSIFICATION OF WARPED PRODUCT MANIFOLDS WITH GRADIENT YAMABE SOLITONS

Choi, Jin Hyuk,Kim, Byung Hak,Lee, Sang Deok Korean Mathematical Society 2020 대한수학회논문집 Vol.35 No.1

In this paper, we study gradient Yamabe solitons in the warped product manifolds and classify the warped product manifolds with gradient Yamabe solitons. Moreover we investigate the admitness of gradient Yamabe solitons and geometric structures for some model spaces.

Characteristics of contact and distance osteogenesis around modified implant surfaces in rabbit tibiae

Choi, Jung-Yoo,Sim, Jae-Hyuk,Yeo, In-Sung Luke Korean Academy of Periodontology 2017 Journal of Periodontal & Implant Science Vol.47 No.3

Purpose: Contact and distance osteogenesis occur around all endosseous dental implants. However, the mechanisms underlying these processes have not been fully elucidated. We hypothesized that these processes occur independently of each other. To test this, we used titanium (Ti) tubes to physically separate contact and distance osteogenesis, thus allowing contact osteogenesis to be measured in the absence of possible triggers from distance osteogenesis. Methods: Sandblasted and acid-etched (SLA) and modified SLA (modSLA) implants were used. Both types had been sandblasted with large grit and then etched with acid. The modSLA implants then underwent additional treatment to increase hydrophilicity. The implants were implanted into rabbit tibiae, and half were implanted within Ti tubes. The bone-to-implant contact (BIC) ratio was calculated for each implant. Immunohistochemical analyses of bone morphogenetic protein (BMP)-2 expression and new bone formation (Masson trichrome stain) were performed. Results: The implants outside of Ti tubes were associated with good bone formation along the implant surface. Implantation within a Ti tube significantly reduced the BIC ratio (P<0.001). Compared with the modSLA implants, the SLA implants were associated with significantly higher BIC ratios, regardless of the presence or absence of Ti tubes (P=0.043). In the absence of Ti tubes, the bone adjacent to the implant had areas of new bone formation that expressed BMP-2 at high levels. Conclusions: This study disproved the null hypothesis and suggested that contact osteogenesis is initiated by signals from the old bone that undergoes distance osteogenesis after drilling. This signal may be BMP-2.