Effect of Total Hip Arthroplasty on Ipsilateral Lower Limb Alignment and Knee Joint Space Width: Minimum 5-Year Follow-up

Choi Yun Seong,Park Jung-Wee,Kim Tae Woo,Kang Kee Soo,Lee Young-Kyun,Koo Kyung-Hoi,Chang Chong Bum 대한의학회 2023 Journal of Korean medical science Vol.38 No.20

Background: This study aimed to 1) assess the effect of total hip arthroplasty (THA) on coronal limb alignment, namely, the hip–knee–ankle angle (HKA), 2) identify factors that determine changes in the HKA, and 3) determine whether alignment changes influence the knee joint space width. Methods: We retrospectively evaluated 266 limbs of patients who underwent THA. Three types of prostheses with neck shaft angles (NSAs) of 132°, 135°, and 138° were used. Several radiographic parameters were measured in the preoperative and final radiographs (at least 5 years after THA). A paired t-test was used to confirm the effect of THA on HKA change. Multiple regression analysis was performed to identify radiographic parameters related to HKA changes following THA and changes in knee joint space width. Subgroup analyses were performed to reveal the effect of NSA change on the HKA change, and the proportion of total knee arthroplasty usage and changes in radiographic parameters between maintained joint space and narrowed joint space groups were compared. Results: The preoperative mean HKA was 1.4° varus and increased to 2.7° varus after THA. This change was related to changes in the NSA, lateral distal femoral angle, and femoral bowing angle. In particular, in the group with a decrease in NSA of > 5°, the preoperative mean HKA was largely changed from 1.4° varus to 4.6° varus after THA. The prostheses with NSA of 132° and 135° also led to greater varus HKA changes than those with an NSA of 138°. Narrowing of the medial knee joint space was related to changes in the varus direction of the HKA, decrease in NSA, increase in femoral offset. Conclusion: A large reduction in NSA can lead to considerable varus limb alignment after THA, which can have adverse effects on the medial compartment of the ipsilateral knee.

Projections of summertime ozone concentration over East Asia under multiple IPCC SRES emission scenarios

Lee, Jae-Bum,Cha, Jun-Seok,Hong, Sung-Chul,Choi, Jin-Young,Myoung, Ji-Su,Park, Rokjin J.,Woo, Jung-Hun,Ho, Changhoi,Han, Jin-Seok,Song, Chang-Keun Elsevier 2015 Atmospheric environment Vol.106 No.-

<P><B>Abstract</B></P> <P>We have developed the Integrated Climate and Air Quality Modeling System (ICAMS) through the one-way nesting of global–regional models to examine the changes in the surface ozone concentrations over East Asia under future climate scenarios. Model simulations have been conducted for the present period of 1996–2005 to evaluate the performance of ICAMS. The simulated surface ozone concentrations reproduced the observed monthly mean concentrations at sites in East Asia with high R<SUP>2</SUP> values (0.4–0.9), indicating a successful simulation to capture both spatial and temporal variability. We then performed several model simulations with the six IPCC SRES scenarios (A2, A1B, A1FI, A1T, B1, and B2) for the next three periods, 2016–2025 (the 2020s), 2046–2055 (the 2050s), and 2091–2100 (the 2090s). The model results show that the projected changes of the annual daily mean maximum eight-hour (DM8H) surface ozone concentrations in summertime for East Asia are in the range of 2–8 ppb, −3 to 8 ppb, and −7 to 9 ppb for the 2020s, the 2050s, and the 2090s, respectively, and are primarily determined based on the emission changes of NO<SUB>x</SUB> and NMVOC. The maximum increases in the annual DM8H surface ozone and high-ozone events occur in the 2020s for all scenarios except for A2, implying that the air quality over East Asia is likely to get worse in the near future period (the 2020s) than in the far future periods (the 2050s and the 2090s). The changes in the future environment based on IPCC SRES scenarios would also influence the change in the occurrences of high-concentrations events more greatly than that of the annual DM8H surface ozone concentrations. Sensitivity simulations show that the emissions increase is the key factor in determining future regional surface ozone concentrations in the case of a developing country, China, whereas a developed country, Japan would be influenced more greatly by effects of the regional climate change than the increase in emissions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Change in ozone level is determined by the combination of NO<SUB>x</SUB> and NMVOC emissions. </LI> <LI> Ozone level over East Asia would get worse in the near future (the 2020s) than far future. </LI> <LI> A high-concentration event generally increases and more frequently occurs in the future. </LI> <LI> Change in ozone air quality in a developing country depends more on emissions change. </LI> <LI> Change in ozone air quality in a developed country depends more on climate change. </LI> </UL> </P>

Changes in the Ångstrom Exponent during Aerosol Coagulation and Condensation

Jung, Chang H.,Lee, Ji Yi,Kim, Yong P. Korean Society for Atmospheric Environment 2012 Asian Journal of Atmospheric Environment (AJAE) Vol.6 No.4

In this study, the ${\AA}$ngstrom exponent for polydispersed aerosol during dynamic processes was investigated. Log-normal aerosol size distribution was assumed, and a sensitivity analysis of the ${\AA}$ngstrom exponent with regards the coagulation and condensation process was performed. The ${\AA}$ngstrom exponent is expected to decrease because of the particle growth due to coagulation and condensation. However, it is difficult to quantify the degree of change. In order to understand quantitatively the change in the ${\AA}$ngstrom exponent during coagulation and condensation, different real and imaginary parts of the refractive index were considered. The results show that the ${\AA}$ngstrom exponent is sensitive to changes in size distribution and refractive index. The total number concentration decreases and the geometric mean diameter of aerosols increase during coagulation. On the while, the geometric standard deviation approaches monodispersed size distribution during the condensation process, and this change in size distribution affects the ${\AA}$ngstrom exponent. The degree of change in the ${\AA}$ngstrom exponent depends on the refractive index and initial size distribution, and the size parameter changes with the ${\AA}$ngstrom exponent for a given refractive index or chemical composition; this indicates that the size distribution plays an important role in determining the ${\AA}$ngstrom exponent as well as the chemical composition. Subsequently, this study shows how the ${\AA}$ngstrom exponent changes quantitatively during the aerosol dynamics processes for a log-normal aerosol size distribution for different refractive indices; the results showed good agreement with the results for simple analytic size distribution solutions.

Changes in the Angstrom Exponent during Aerosol Coagulation and Condensation

Chang H. Jung,Ji Yi Lee,Yong P. Kim,김용표 한국대기환경학회 2012 Asian Journal of Atmospheric Environment (AJAE) Vol.6 No.4

In this study, the Ångstrom exponent for polydispersed aerosol during dynamic processes was investigated. Log-normal aerosol size distribution was assumed,and a sensitivity analysis of the Ångstrom exponent with regards the coagulation and condensation process was performed. The Ångstrom exponent is expected to decrease because of the particle growth due to coagulation and condensation. However, it is difficult to quantify the degree of change. In order to understand quantitatively the change in the Ångstrom exponent during coagulation and condensation,different real and imaginary parts of the refractive index were considered. The results show that the Ångstrom exponent is sensitive to changes in size distribution and refractive index. The total number concentration decreases and the geometric mean diameter of aerosols increase during coagulation. On the while, the geometric standard deviation approaches monodispersed size distribution during the condensation process, and this change in size distribution affects the Ångstrom exponent. The degree of change in the Ångstrom exponent depends on the refractive index and initial size distribution, and the size parameter changes with the Ångstrom exponent for a given refractive index or chemical composition; this indicates that the size distribution plays an important role in determining the Ångstrom exponent as well as the chemical composition. Subsequently, this study shows how the Ångstrom exponent changes quantitatively during the aerosol dynamics processes for a log-normal aerosol size distribution for different refractive indices; the results showed good agreement with the results for simple analytic size distribution solutions.

전치개교의 교정치료후 과두위치 변화

신수정,장영일 대한 두개하악장애학회 1993 대한두개하악장애학회지 Vol.5 No.2

ABSTRACTThis study was aimed to evaluate the changes in condylar position when severe anterior open bite pa- tients were treated with MEAW.The subjects consisted of 11 patients(21 TMJs) who visited the departement of orthodontics in SNUH, having severe anterior open bite as a chief complain. They were supposed to wear the up and down elas- tics and MEAW after finishing the leveling. The condylar position was evaluated with individualized cor- rected tomography in centric occlusion taken before and after treatment.The results were as follows; 1. In the change of condylar position after treatment, there were no statistically significant differences in right and left TMJs. 2. In the change of condylar position after treatment, there were no statistically significant differences in each malocclusion groups. 3. There were no statistically significant differences in percent dispacement of condyle between before and after treatment. 4. There were no statistically significant differences in the amount of change in condylar change. This study was aimed to evaluate the changes in condylar position when severe anterior open bite patients were treated with MEAW. The subjects consisted of 11 patients(21 TMJs) who visited the departement of orthodontics in SNUH, having severe anterior open bite as a chief complain. They were supposed to wear the up and down elastics and MEAW after finishing the leveling. The condylar position was evaluated with individualized corrected tomography in centric occlusion taken before and after treatment. The results were as follows ; 1. In the change of condylar position after treatment, there were no statistically significant differences in right and left TMJs. 2. In the change of condylar position after treatment, there were no statistically significant differences in each malocclusion groups. 3. There were no statistically significant differences in percent dispacement of condyle between before and after treatment. 4. There were no statistically significant differences in the amount of change in condylar change.

일반논문 : 전국(戰國)시기를 중심으로 본 신(信)관념의 변화 -제주지역 공유재 연구를 위한 담론2-

정창원 ( Chang Won Jung ) 제주대학교 탐라문화연구소 2014 탐라문화 Vol.0 No.46

“공유재(common pool resources)의 사용과 관리”는 역사적 관점에서 접근하자면 “사회적인 약속 - 信”이라는 관념적 기초에서 파생된다고 말할 수 있다. 다자간의 의식 속에 함유된 信의 관념이 유지될 때 비로소 공유재의 사용에 대한 사회적 약속 또한 합리적인 구속력을 유지할 수 있을 것이다. 춘추시대 인식된 信의 관념은 그 시대에 흐름에 따라 변화를 가져올 수밖에 없었을 것이다. 信의 윤리도덕에 내재된 의미는 외부의 열악한 시공과 환경으로 좌절될 수 없지만, 현실정치의 이해와 충돌하였을 때에는 信의 관념이 희생되는 면도 없지 않다. 그러나 信이라고 하는 윤리도덕에 내재하고 있는 의미는 여전히 사람이 처세하고 사회적 합의를 이루는데 있어서 중요하고 영원불변한 기본덕목일 것이다. 춘추전국시대의 정치발전은 ‘信’에 대한 관념이 변하고 있음을 뚜렷이 보여주고 있다. 이러한 현상의 형성은 두 가지 신흥세력인 종횡가와 병가와 밀접한 관계가 있는데, 종횡가와 병가의 공통 목표는 모두 국가로 하여금 강성하게 하는 것이었고, 그들에게 있어 중요한 것은 바로 어떻게 하면 패하지 않는 위치에 서는 것일까라는 점이었다. 현실정치의 환경에 처해서도 그들은 ‘信’의 도덕적 관념을 지킬 수 없었고, 또한 그들의 행위는 전국시대 ‘信’을 중시하지 않는 기풍을 형성하게 하였다. 秦의 통일에 따라 ‘信’의 관념은 도구적인 용도로 변하여 통치의 방법이 되었고, 그 이전시기와는 다르게 도덕적 범주를 벗어났다. 진은 법에 의거하여 국가를 세웠기 때문에 자연히 법가적 통치방법을 계승하였다. 법가는 ‘信’을 국가 통치의 도구로 삼았고 군주가 ‘信’이 있어 여러 도덕적인 역량에 호소하지 않는 것이 신민을 다스리는데 이로웠는데 이는 당연히 통일제국의 출현과 관련이 있다. 춘추시대부터 전국시대까지 ‘信’의 관념은 확실히 변화를 보였다. 그러나 변화의 과정 중에는 또한 영원불변의 부분을 내포하고 있기도 하다. In the study of continuous management of common pool resources that Jeju National University Research Team aims, the use and management of common pool resources can say to be derived from ideological basis "Social commitment - Trust (信)". When the idea of Trust (信) in consciousness of multilateral maintains, the social commitment for common pool resources will also be able to maintain reasonable binding force. Trust (信)" exists as actual personal morality for a very long time. However, the Trust (信) becomes the notion of real morality from the Spring and Autumn period, and the Confucianists (儒家) succeed and complete the ideological system in the pre-Qin period. Many pre-Qin period schools have different point of view for the Trust, but basically, they agree that the Trust (信) is an important moral ethics. The idea of Trust (信) during the Spring and Autumn period would be forced to bring the change, depending on the age. However, during the process of change, it also involves the part of eternal unchange. The notion of morality, which the Trust (信) includes, has construction-transcendent eternity. In other words, it has a part of a constant perpetuity. Inherent meaning of ethics of Trust (信) cannot be frustrated by external construction and environment, but when it confronts the understanding of real politics, the concept of Trust (信) may sacrifice. However, the inherent meaning of the Trust (信) is still important and eternal unchangeable basic virtue in getting along with people and achieving social consensus. As reaching the Warring States Periods, the period spirit becomes more cunning and odd, and so it seems to be recognized that winning the victory by using the trick and force has direct effect. To make favorable circumference of their country, the countries repeat lying and breaking the Trust among them. Therefore, the Trust (信) cannot discuss no longer in this situation. The vow also seems to become almost collapsed. As the result of not believing in each other, the universe unification of the Qin Dynasty (秦) finally could be completed. The political development of spring-autumn period and Warring States Periods shows clearly that the idea of Trust (信) is changing. The formation of this phenomenon is closely related in political strategists (縱橫家) and military strategist in ancient China (兵家). The common goal of them is to make it rigid, and the important thing for them is how to stand at the position that does not defeat. They could not keep the moral ideas of Trust (信) in real politics, and also their actions build the spirit that does not concern the Trust (信) of the Warring States Periods important. According to he unification of Qin (秦), the concept of the Trust (信) is changed to instrumental use and becomes method of ruling. Unlike the previous period, it deviates from the moral category. Jin establishes the nation under the laws, so it succeeds in Legalists(法家) ruling methods. The Legalists (法家) make the Trust (信) as a tool for governing country. It is beneficial to govern the subjects if does not complain to the moral capability. This is, of course, related to the emergence of a unified empire. From the Spring and Autumn period to the Warring States Period, the idea of Trust (信) shows definite change. However, during the process of change, it also implies the part of the eternal unchange. As describe above, the try for exploring the understanding of ideological change of the Trust (信) is for providing historical background to search fundamental elements of common pool resources`` sustainable use and management. Thus, I expect to the historical information above is provided as a basis to the current conflict elements in Jeju community that the Jeju National University SSK Research Team tries. I also hope that it becomes historical background for original searching of current social conflicts through exploring the conscious change of Trust (信) after the Spring and Autumn period.

만성 두부외상 환자에서 99mTc - HMPAO Brain SPECT의 임상적 유용성

서정호(Jung Ho Suh),김동익(Dong Ik Kim),정태섭(Tae Sub Chung),이종두(Jong Doo Lee),박창윤(Chang Yoon Park),정진일(Jin Ill Chung),김영수(Young Soo Kim) 대한핵의학회 1992 핵의학 분자영상 Vol.26 No.1

N/A Minima1 deterioration of cerebral perfusion or microanatomical changes were undetectable on conventional Brain CT or MRI. So evaluation of focal functional changes of the brain parenchyme is essential in chronic head injury patients, who did not show focal anatomical changes on these radiological studies. However, the patients who had longstanding neurologic sequelae following head injury, there had been no available imaging modalities for evaluating these patients precisely. Therefore we tried to detect the focal functional changes on the brain parenchyme using Tc-99m-HMPAO Brain SPECT on the patients of chronic head injuries. Twenty three patients who had suffered from headache, memory dysfunction, personality change and insomnia lasting more than six months following head injury were included in our cases, which showed no anatomical abnormalities on Brain CT or MRI. At first they underwent psychological test whether the symptoms were organic or not. Also we were able to evaluate the cerebral perfusion changes with Tc-99m-HMPAO Brain SPECT in 22 patients among the 23, which five patients were focal and 17 patients were nonfocally diffuse perfusion changes. Thus we can predict the perfusion changes such as local vascular deterioration or functional defects using Tc-99m-HMPAO Brain SPECT in the patients who had suffered from post-traumatic sequelae, which changes were undetectable on Brain CT or MRI.

What are the Characteristics and Qualities of Secondary Physical Education Teachers that Contribute to the Positive Changes in Students` Character?

( Eui Chang Choi ),( Soon Jung Choi ) 한국체육학회 2015 국제스포츠과학 학술대회 Vol.2015 No.1

Purpose: The purpose of this study was to examine what characteristics and qualities of a teacher bring out positive changes in students. In order to this, researcher investigated positive changes of students and PE teacher`s characteristics and qualities that promote students` changes. Method: This study used qualitative complex case study. Participants were 5 PE teachers who participate in community focusing on students` character development, and their 10 students. Non-participant observation and in-depth interview were used. In addition, open questionnaire was administered with 200 students. Collected data were analyzed using inductive thematic analysis. Triangulation, member checks, and peer debriefing were conducted to enhance the trustworthiness of this study. Result: First, character of students have changed in various way. Students internalized 4 virtues of In, Eui, Ye, Gi categorized as most comprehensive range. They made an effort to become those who are filled with love(In), justice(Eui), courtesy(Ye), wisdom(Gi). Second, positive change effects are not based on single dimension but it depends on overall dimensions such as health, wisdom, emotion, morality, and spirituality. Health as qualities of PE teacher is concerned with achieving excellence in sport performance and keeping in good shape. Wisdom is concerned with having knowledge about the methods of PE class and preparing, being well-informed of character education and applying it to PE class, and noticing and managing students` changes in character. Emotion is associated with believing relationship with student important and being contented with students` enjoyment. Morality is concerned with trying to become a whole person a good model. Spirituality is associated with cherishing PE, students, themselves, and god, and pursuing students` development to become a whole person. These characteristics and qualities of PE teachers influenced to students on the whole process such as preparation, execution, and reflection of PE classes. It showed a stronger influence on the students` character changes when PE teachers exert to reflect and compliment themselves. Conclusion: Character development in students is not based on teacher`s content knowledge and instructional techniques. Character of students can be positive only when PE teachers` wholeness involved on the whole. It should reflect to in-service education for PE teachers about students` character. Furthermore we must research more in depth about what types of qualities of teachers give students` change in some types of pathways.

Causes and Predictive Factors Associated with “Diagnosis Changed” Outcomes in Patients Notified as Tuberculosis Cases in a Private Tertiary Hospital

( Byung Ju Kang ),( Kyung Wook Jo ),( Tai Sun Park ),( Jung Wan Yoo ),( Sei Won Lee ),( Chang Min Choi ),( Yeon Mok Oh ),( Sang Do Lee ),( Woo Sung Kim ),( Dong Soon Kim ),( Tae Sun Shim ) 대한결핵 및 호흡기학회 2013 Tuberculosis and Respiratory Diseases Vol.75 No.6

Background: The aim of our study was to evaluate the “diagnosis changed” rate in patients notified as tuberculosis (TB) on the Korean TB surveillance system (KTBS). Methods: A total of 1,273 patients notified as TB cases on the KTBS in one private tertiary hospital in 2011 were enrolled in the present study. Patients were classified into three groups: “diagnosis maintained”, “diagnosis changed” (initially notified as TB, but ultimately diagnosed as non-TB), and “administrative error” (notified as TB due to administrative errors). Results: Excluding 17 patients in the “administrative error” group, the “diagnosis maintained” and “diagnosis changed” groups included 1,097 (87.3%) and 159 patients (12.7%), respectively. Common causes of “diagnosis changed” were nontuberculous mycobacterial (NTM) disease (51.7%, 61/118), and pneumonia (17.8%) in cases notified as pulmonary TB, and meningitis (19.5%, 8/41) and Crohn`s disease (12.2%) in cases notified as extrapulmonary TB. Being older than 35 years of age (odds ratio [OR], 2.18) and a positive acid-fast bacilli stain (OR, 1.58) were positive predictors and a TB-related radiological finding (OR, 0.42) was a negative predictor for a “diagnosis changed” result via multivariate logistic regression analysis in pulmonary TB cases. Conclusion: Because of a high “diagnosis changed” rate in TB notifications to the KTBS, the TB incidence rate measured by the KTBS may be overestimated. Considering the worldwide trend toward increased NTM disease, the “diagnosis changed” rate may increase over time. Thus, when reporting the annual TB notification rate in Korea, the exclusion of “diagnosis changed” cases is desirable.

회계이익변경에 대한 단순투자자의 반응

김지홍 ( Jee Hong Kim ),장진호 ( Jin Ho Chang ),여은정 ( Eun Jung Yeo ) 한국회계학회 2004 會計學硏究 Vol.29 No.3

본 연구는 1998년 초부터 2003년 6월말까지 증권거래소의 전자공시시스템에 회계변경을 공시한 상장기업을 표본으로 하여, 단순투자자의 비율이 높은 기업에서의 회계이익변경에 대한 주가반응을 살펴보았다. 연구 결과, 단순투자자(naive investor)의 대용치로 사용된 개인소액투자자의 지분이 높은 기업에서 회계변경으로 인한 보고이익의 증가가 높을수록 양(+)의 주가반응이 존재함을 발견하였다. 이 결과는 실증회계이론에서 제시한 보고이익의 증가가 계약비용을 감소시키는 효과를 통제한 후에도 유의하였다. 반면, 전문투자자(sophisticated investor)의 대용치로 사용된 기관투자자 및 외국인투자자의 지분이 높은 기업에서는 회계변경으로 인한 이익증가에 유의적인 시장반응이 관찰되지 않았다. 본 연구의 결과는 한계투자자의 전문성에 따라 회계정보에 대한 주가반응이 상이할 수 있다는 확장된 기능적 고착가설(extended functional fixation hypothesis)을 지지하는 결과이다. This study empirically examines whether there is price reaction of the accounting changing companies which have high rate of unsophisticated investors` holdings. That is, this study will analyze whether there is different response to reported earnings changes by accounting change between unsophisticated and sophisticated investors. Most significantly, this study observes the cumulative abnormal returns on the time of disclosing to the accounting change. The final sample consists of 96 listed on the Korean Stock Exchange and disclosed by an Electronic Disclosure System over the period of 1998 to June, 2003. The results of this study are summarized as follows. First, there is positive relation between price reaction of individual investors proxied by naive investors and the reported earnings by accounting changes. This means that unsophisticated investors react naively on the increase of earnings by accounting changes. Second, there is no positive relation between the price reaction of institutional or foreign investors proxied by sophisticated investors and the increasing earnings by accounting changes. This means that sophisticated investors don`t react naively in the increase of earnings by accounting changes. These results supports the extended functional fixation hypothesis that price reactions of the accounting information can be varied according to the marginal investor`s expertise.