영구치 치수 기질세포를 이용한 연골 분화 및 분화 시기에 따른 형태학적 변화

정주령,김하나,박열,김민정,오영주,신수정,최윤정,김경호 大韓齒科保存學會 2012 Restorative Dentistry & Endodontics Vol.37 No.1

Objectives: The aim was to confirm the stem cell-like properties of the dental pulp stromal cells and to evaluate the morphologic changes during in vitro chondrogenesis. Materials and Methods: Stromal cells were outgrown from the dental pulp tissue of the premolars. Surface markers were investigated and cell proliferation rate was compared to other mesenchymal stem cells. Multipotency of the pulp cells was confirmed by inducing osteogenesis, adipogenesis and chondrogenesis. The morphologic changes in the chondrogenic pellet during the 21 day of induction were evaluated under light microscope and transmission electron microscope. TUNEL assay was used to evaluate apoptosis within the chondrogenic pellets. Results: Pulp cells were CD90, 105 positive and CD31, 34 negative. They showed similar proliferation rate to other stem cells. Pulp cells differentiated to osteogenic, adipogenic and chondrogenic tissues. During chondrogenesis, 3-dimensional pellet was created with multi-layers, hypertrophic chondrocyte-like cells and cartilage-like extracellular matrix. However, cell morphology became irregular and apoptotic cells were increased after 7 day of chondrogenic induction. Conclusions: Pulp cells indicated mesenchymal stem cell-like characteristics. During the in vitro chondrogenesis, cellular activity was superior during the earlier phase (within 7 day) of differentiation.

How Can Healthy Meal Kits Look Attractive to Consumers?

Choo Yeon KIM,Hee Ryung RYU,Seong Soo CHA 한국유통과학회 2022 The Journal of Industrial Distribution & Business( Vol.13 No.12

Purpose: This study aims to analyze the importance of customers' selection attributes for meal kits, which is rapidly increasing in the home meal replacement food market, and empirically analyze the effect of food selection attributes on consumer satisfaction and repurchase intention toward meal kits. Research design, data, and methodology: Based on the results of previous research, factors that customers consider the most when purchasing a meal kit are nutritional components, ingredients, hygiene, taste, and price. The empirical analysis is conducted by using structural equation modeling to determine the extent that customer selection attributes for meal kits affect customer satisfaction and repurchase intention. The survey is conducted online from January 1 to March 15, 2022, and 282 valid samples are used for the analysis. Results: The result of the analysis confirms that nutritional components, hygiene, taste, and price have a statistically significant effect on customer satisfaction and repurchase intention. However, the effect of food ingredients on customer satisfaction and repurchase intention is rejected because no statistically significant results are obtained. Conclusions: As an empirical analysis of the importance of customer selection attributes of meal kits, this study has meaningful implications for related industries and business-to-business operators and provides basic data for the strategic development of related industries.

The relationship between malocclusion and menarcheal age, and its secular trend for Korean women

Choi, Yoon-Jeong,Chung, Choo-Ryung,Kim, Kyung-Ho The Korean Association Of Orthodontists 2012 대한치과교정학회지 Vol.42 No.1

Objective: This study aimed to evaluate the mean age of menarche, its secular trend in Korean women, and the relationship between malocclusion and the rate of skeletal maturation, as defined by menarcheal age. Methods: We retrospectively collected data on menarcheal age from 931 Korean women born during 1961 - 1997. Subjects were divided by the malocclusion type and birth-year decade into 3 and 4 groups, respectively. The mean menarcheal age for each group was determined, and one-way ANOVA was performed for intergroup comparison (p = 0.05). Two-way ANOVA was also performed to compare all the 12 subgroups (p = 0.05). Results: The mean age of menarche was 12.82 years for Korean women born during 1961 - 1997. A distinct downward secular trend of menarcheal age was noticed (p < 0.05). For the birth-year decade 1961 - 1970, the Class III malocclusion group showed earlier onset of menarche than the other malocclusion groups (p < 0.05), but the other birth-year groups did not show any significant difference in the type of malocclusion (p > 0.05). Conclusions: A positive secular trend towards earlier menarche exists among Korean women. Malocclusion does not show any significant relationship with the rate of skeletal maturation, as defined by menarcheal age.

Lifetime Management Method of Lithium-ion battery for Energy Storage System

Won, Il-Kuen,Choo, Kyoung-Min,Lee, Soon-Ryung,Lee, Jung-Hyo,Won, Chung-Yuen The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.3

The lifetime of a lithium-ion battery is one of the most important issues of the energy storage system (ESS) because of its stable and reliable operation. In this paper, the lifetime management method of the lithium-ion battery for energy storage system is proposed. The lifetime of the lithium-ion battery varies, depending on the power usage, operation condition, and, especially the selected depth of discharge (DOD). The proposed method estimates the total lifetime of the lithium-ion battery by calculating the total transferable energy corresponding to the selected DOD and achievable cycle (ACC) data. It is also demonstrated that the battery model can obtain state of charge (SOC) corresponding to the ESS operation simultaneously. The simulation results are presented performing the proposed lifetime management method. Also, the total revenue and entire lifetime prediction of a lithium-ion battery of ESS are presented considering the DOD, operation and various condition for the nations of USA and Korea using the proposed method.

Association between Muscle Loss and Urinary Incontinence in Elderly Korean Women

Hyun-Jung Park,Se Ryung Choo,Sang-Hyuk Kim,Hyun-Ki Lee,손기영 대한가정의학회 2015 Korean Journal of Family Medicine Vol.36 No.1

Ba ckground: Incontinence and muscle loss are important senior health issues. Nevertheless, there are no available domestic or international studies on the association between urinary incontinence and muscle loss. The aim of this study was to investigate the association between muscle loss and urinary incontinence in elderly Korean woman. Me thods: Korean women (1,313) ≥65 years of age whose complete body composition data were collected using dual X-ray absorptiometry were analyzed from the Fourth Korean National Health and Nutritional Examination Surveys. Class I and II losses of the appendicular, truncal, and total muscle mass were defined using adjustments for weight and height. Each participant’s incontinence status was collected using constructed questionnaires. Multiple logistic regression was performed to examine the association between muscle loss and incontinence. Re sults: On the basis of physician-diagnosed incontinence, weight- and height-adjusted muscle loss showed no association with urinary incontinence (weight-adjusted muscle loss: class I adjusted odds ratio [aOR], 0.77; 95% confidence interval [CI], 0.34 to 1.73; class II aOR, 1.37; 95% CI, 0.59 to 3.18; height-adjusted muscle loss: class I aOR, 0.51; 95% CI, 0.18 to 1.51; class II aOR, 1.86; 95% CI, 0.22 to 15.79). Similar results were observed for truncal muscle and total muscle mass as well as self-reported urinary incontinence. Co nclusion: Our study found no association between urinary incontinence and appendicular, truncal, and total muscle loss in elderly Korean women.

증례 : 혈액종양 ; 헬리코박터 제균 치료 후 완전 관해된 방광의 원발성 점막연관 림프조직 림프종 1예

이선표 ( Sun Pyo Lee ),주명수 ( Myung Soo Choo ),류민희 ( Min Hee Ryu ),송민정 ( Min Jeong Song ),서세영 ( Se Young Seo ),정유문 ( Yu Mun Jeong ),서명숙 ( Myeong Sook Seo ),허주영 ( Joo Ryung Huh ) 대한내과학회 2014 대한내과학회지 Vol.87 No.2

방광에서 발생한 원발성 MALT 림프종은 드문 질환으로 만성 방광염과 유사한 임상 증상을 갖고 국내에서 지금까지 보고된 사례는 1예뿐이다. 저자들은 혈뇨를 주소로 내원한 중년 여성에서 만성 방광염에서 병발한 MALT 림프종을 진단하고 방사선 치료나 항암화학요법이 아닌 항생제 투여를 통해 완치하였기에 문헌고찰과 함께 보고하는 바이다. Primary lymphoma of the urinary bladder is rare, comprising 0.2% of extranodal lymphomas. The predominant subtype of mucosa-associated lymphoid tissue (MALT) is extranodal marginal zone lymphoma. We report a case of MALT lymphoma of the urinary bladder in a 53-year-old female patient presenting with a five-year history of persistent hematuria and urinary frequency. A cystoscopy revealed multiple nodular lesions at the posterior wall and trigone of the bladder. The tissue obtained by cold-cup biopsy revealed lymphoid infiltration consistent with low-grade MALT lymphoma. Image studies revealed that the tumor originated from the urinary bladder and there was no evidence of metastases. The patient was positive for a rapid urease test. Because of the relationship between gastric MALT lymphoma and Helicobacter pylori, the patient was treated with antibiotics to eradicate Helicobacter pylori. The lymphoma subsequently disappeared and the patient has remained in persistent complete remission for eight years. (Korean J Med 2014;87:229-233)

Lifetime Management Method of Lithium-ion battery for Energy Storage System

Il-Kuen Won,Kyoung-Min Choo,Soon-Ryung Lee,Jung-Hyo Lee,Chung-Yuen Won 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.3

The lifetime of a lithium-ion battery is one of the most important issues of the energy storage system (ESS) because of its stable and reliable operation. In this paper, the lifetime management method of the lithium-ion battery for energy storage system is proposed. The lifetime of the lithium-ion battery varies, depending on the power usage, operation condition, and, especially the selected depth of discharge (DOD). The proposed method estimates the total lifetime of the lithium-ion battery by calculating the total transferable energy corresponding to the selected DOD and achievable cycle (ACC) data. It is also demonstrated that the battery model can obtain state of charge (SOC) corresponding to the ESS operation simultaneously. The simulation results are presented performing the proposed lifetime management method. Also, the total revenue and entire lifetime prediction of a lithium-ion battery of ESS are presented considering the DOD, operation and various condition for the nations of USA and Korea using the proposed method.

Propofol 을 이용한 마취유도 시 Butorphanol 병용 투여가 Propofol 의 마취용량, 혈역학적 변화와 회복 양상에 미치는 영향

김태환,김웅,추동훈,원유흥,김형태,정혜령 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.38 No.2

Background : This study was proposed to examine the effects of butorphanol on propofol dose requirements and hemodynamic responses during propofol-N_2O-O_2 anesthesia. In addition, the effects of butorphanol on the recovery time, sedation score and postoperative first analgesic request time were assessed. Methods: Forty patients were allocated to 2 groups. Twenty patients received butorphanol (20 ㎍/kg, group B) and the others received an equal volume of placebo (group P) 3 minutes before induction with propofol. After induction, anesthesia was maintained with propofol (6 - 10 ㎍/kg, iv)-N_2O (70%)-O_2 (30%). Propofol doses for induction and maintenance and hemodynamic responses (blood pressure, heart rate) were checked. After surgery, sedation score, recovery profiles, and postoperative first analgesic request time were assessed. Results : The induction doses of propofol were lower in group B than in group P. Diastolic pressure and heart rate decreased in group B compared to group P after endotracheal intubation and before skin incision. After skin incision, decreased diastolic pressure and heart rate returned to preanesthetic levels in group P, but the decreased level was sustained in group B. There were group differences in sedation score at 5 and 10 minutes after extubation. In group B, recovery was delayed and more time elapsed before the first analgesic request. Conclusions : Butorphanol co-administered with propofol reduces the induction dose of propofol and delays the first analgesic request time, but there are significant fluctuations in blood pressure and heart rate during endotracheal intubation and skin incision.(Korean J Anesthesiol 2000; 38: 258~264)

소형선박 유지.관리용 Floating Dock시스템 개념설계

박충환(Chyng-Hwan. Park),심상목(Sang-Mok. Shim),추경훈(Kyung-Hoon. Choo),이경환(Kyung-Hwan. Lee),진종룡(Jong-Ryung. Jin) 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.3 No.1

최근, 국민소득 증대와 주5일제 근무 확산으로 낚시를 포함한 레저수요가 가일층 증가하고 있고 더불어 낚시어선을 포함하는 소형선박의 척수도 매년 증가하고 있는 추세이지만, 소형 선박의 수리, 유지관리 등을 목적으로 해상에서 육상으로 선박을 끌어올리는 상가작업은 소형조선소의 작업공간, 예인비용, 작업공기, 안전측연에서 많은 단점으로 지적되고 있다. 이에, 본 연구에서는 연안 소형선박 수리, 유지관리를 위한 Floating dock 시스템 개발의 기초연구로서 Floating dock 시스템 개념정립 및 소형선박의 도크내 유입.출, 계류기능 등을 모형시험 .검증 등을 통해 개념설계 도서를 작성함으로서 향후, 소형조선소의 작업공간, 인력 및 공기단축 등에 따른 경상비용 절감과 소형선박 유지관리용 Floating dock 개발, 보급을 통한 신규물량 창출로 경영수지 개선에 기여하고자 한다. In recent years, the repairing work of the small boats in dock have pointed out a defects of the many FRP shipbuiling because of a term of works and working-space and man-power. In the paper By carried out the model tests and structure analysis of the floating dock were mainly drawing on the concept design of the floating dock systems that the above defects were solved.

상악 좌측 견치의 구개측 매복과 과개교합을 동반한 성장기 골격성 II급 부정교합의 치험례

김종희(Jong Hee Kim),황순신(Soon Shin Hwang),정주령(Choo-Ryung Chung),김경호(Kyung-Ho Kim) 연세대학교 치과대학 두개안면기형연구소 2017 연세임상교정 Vol.24 No.2

성공적인 성장 조절을 위해 치료의 시기는 매우 중요하며, 성장 단계의 정확한 판단과 적절한 치료 방법, 환자의 협조도가 치료의 성패를 좌우하게 된다. 성장기 골격성 II급 부정교합 환자의 경우 상악 성장을 억제하는 구외력과 하악 성장을 증대시키는 악기능 장치를 사용할 수 있으며 2가지 방법을 같이 사용 시 효율적인 치료 효과를 나타낼 수 있는 것으로 알려져 있다.1 또한 상악 견치는 전치부 중 가장 긴 치근을 가지고 있으며, mouth corner에 위치하고 있어 심미적으로 중요하며, 교합 시 canine guidance를 담당하는 등 기능적으로도 큰 역할을 하는 매우 중요한 치아이다. 견치는 발육 기간이 길며, 긴 맹출 경로, 인접 치아 중 가장 늦은 맹출 시기 등으로 인해 이소 맹출과 매복이 쉽게 일어난다. 견치 매복의 2/3은 구개측에 위치하고 있으며, 이러한 매복 견치의 맹출을 유도하여 주는 것은 구강 기능의 회복에 있어 매우 중요하다. 본 증례에서는 상악 견치의 구개측 매복을 동반한 성장기 골격성 II급 부정교합 환자에서 악정형 치료와 매복 견치의 견인을 통해 양호한 치료 결과를 얻었기에 이를 소개하고자 한다. Treatment timing is essential for the success of orthopedic growth modification, along with the accurate diagnosis, appropriate treatment method and the compliance of patients which determines the success of the treatment. In the case of skeletal Class II malocculusion, extraoral force that restricts maxillary growth and functional appliance to increase mandibular growth can be applied, and it is well known that if two treatments are performed in combination, the results are better and more efficient. Moreover, maxillary canine has the longest root among anterior teeth, is located at the mouth corner, and manages canine guidance which plays an essential role in function as well. The canine has a long developmental period, eruption path and also has the latest eruption time compared to other teeth thus ectopic eruption and impaction could easily occur. Around 2/3 of impacted canines are located at palatal area, thus it is essential to perform guided eruption of the impacted canine to recover oral health. The following case shows a skeletal Class II malocclusion with a palatally impacted maxillary canine treated with orthopedic appliances and traction of the impacted canine.