Is it worth to perform initial non-operative treatment for patients with acute ACL injury?: a prospective cohort prognostic study

( Yong-geun Park ),( Chul-won Ha ),( Yong-beom Park ),( Sang-eun Na ),( Manyoung Kim ),( Tae Seon Kim ),( Yong Yeon Chu ) 대한슬관절학회 2021 대한슬관절학회지 Vol.33 No.-

Purpose: To evaluate the result of implementing an initial non-operative treatment program for an acute ACL injury and to find if the timing of initiating the non-operative treatment is significant. Methods: This study included a prospective cohort of 85 consecutive patients with acute ACL injury who were treated according to the above strategy for the initial 3 months with 1-year follow-up. Clinical evaluations were made by Lysholm score, Tegner activity score, Lachman test (LT), pivot-shit test (PST), and the side to side difference (SSD) by KT-2000 arthrometer. The results were analyzed according to the timing of initiating the nonoperative treatment. Results: Initially, 84% of the patients showed LT and PST ≤ grade 1, and 16% with ≥grade 2. At 1-year follow-up, 77 patients (91%) with LT and PST ≤ grade 1 did not receive reconstruction as copers and 8 patients with LT or PST ≥ grade 2 required reconstruction (six patients received the operation and two refused). The patients with LT and PST ≤ grade 1 showed average Lysholm score 91.2, average SSD 2.5 mm, and mean Tegner score decreased from 6.9 (pre-injury) to 6.2. Patients who started the non-operative treatment within 2 weeks after injury revealed superior rates of grade 0 or 1 instability than those who commenced the treatment later than 2 weeks after injury (P = 0.043). Conclusions: Implementing a non-operative treatment with brace in acute phase of ACL injury appears to be an effective and viable option to achieve a reasonable clinical outcome. We recommend earlier initiation of the nonoperative treatment to obtain a better result in patients with acute ACL injury.

Case Report : A case of primary hepatic actinomycosis: an enigmatic inflammatory lesion of the liver

( Yeon Jung Ha ),( Ji Hyun An ),( Ju Hyun Shim ),( Eun Sil Yu ),( Jong Jae Kim ),( Tae Yong Ha ),( Han Chu Lee ) 대한간학회 2015 Clinical and Molecular Hepatology(대한간학회지) Vol.21 No.1

Primary hepatic actinomycosis is one of the chronic abscess-forming infections of the liver. Accurate diagnosis is frequently delayed due to its indolent course and nonspecific clinical and radiological manifestations. We report a case of a 57-year-old man presenting with asymptomatic multiple hepatic masses on follow-up abdominal computed tomography performed 1 year after stomach cancer surgery. Although a percutaneous liver biopsy procedure was conducted twice in order to obtain confirmative pathology, only a nonspecific organizing abscess with plasma cell infiltration was revealed, without identification of any organism in the tissue cultures. Ultimately, actinomycosis was diagnosed following the detection of sulfur granules on open surgical biopsied tissue. This case suggests that primary hepatic actinomycosis should be considered as one of the possible causes for enigmatic inflammatory lesions of the liver. (Clin Mol Hepatol 2015;21:80-84)

1985년 한국에서 발생한 Scrub Typhus 환자의 혈청진단 및 임상역학적 조사

주용규,富山 哲雄,전성주,김민자,박승철,최경열,김연수,이호왕 대한감염학회 1988 감염 Vol.20 No.2

Serological studies were performed on the 2,135 sera from the suspected Hemorrhagic fever with renal syndrome patients in 1985 and 64 scrub typhus patients were diagnosed serologically. Serotypes of etiologic agents, epidemiology and clinical features of the patients with scrub typhus were analyzed. The results were summarized as follows. 1) Among the 64 patients were infected with Rickettsia tsutsugamushi Karp type, 22 patients were infected with Gilliam type and only two patients were infected with Kato type. The remaining 16 patients had antibodies against more than two serotypes of R. tsutsugamush at the same time. 2) The regional occurrence of the patients showed that 33 patients occurred in Kyunggi province and the remaining patients were occurred in all over the Korea. 3) Fifty three of the 64 patients were female and 11 were male. More than a half of the patiens were in age groups of 50-70. 4) As the clinical features, most of the patients showed fever, chill, general weakness and myalgia however, abdominal pain, sputum and dyspnea were not uncommon. Clinical signs such as tachycardia, tachypnea, pharyngeal and conjunctival injection and abdominal tenderness were common but hepatomegaly, hypotension, rales, and edema were uncommon. 5) The laboratory findings showed frequently elevation of transaminase and abnormal chest X-ray, and leukocytosis, thrombocytopenia and abnormal urinary sedimetns were not uncommon. 6) Most of the patients showed one to three weeks of fever and then gradual improvement, but two were died of pulmonary edema. 7) Because most of the patients occurred in autumn, during the epidemic season of HFRS and leptospirosis, the differential serologic diagnosis among the diseases is absolutely demanded.

Assessment of a smartphone-based monitoring system and its application

( Ho Yong Ahn ),( Chu Luong Choi ),( Yeon Yu ) 대한원격탐사학회 2014 大韓遠隔探査學會誌 Vol.30 No.3

Information technology advances are allowing conventional surveillance systems to be combined with mobile communication technologies, creating ubiquitous monitoring systems. This paper proposes monitoring system that uses smart camera technology. We discuss the dependence of interior orientation parameters on calibration target sheets and compare the accuracy of a three-dimensional monitoring system with camera location calculated by space resectioning using a Digital Surface Model (DSM) generated from stereo images. A monitoring housing is designed to protect a camera from various weather conditions and to provide the camera for power generated from solar panel. A smart camera is installed in the monitoring housing. The smart camera is operated and controlled through an Android application. At last the accuracy of a three-dimensional monitoring system is evaluated using a DSM. The proposed system was then tested against a DSM created from ground control points determined by Global Positioning Systems (GPSs) and light detection and ranging data. The standard deviation of the differences between DSMs are less than 0.12 m. Therefore the monitoring system is appropriate for extracting the information of objects` position and deformation as well as monitoring them. Through incorporation of components, such as camera housing, a solar power supply, the smart camera the system can be used as a ubiquitous monitoring system.

Interferon-gamma, Tumor Necrosis Factor-alpha및 Transforming Growth Factor-beta(1)에 의한 골수세포의 유착분자 발현 및 Stromal Cell-Derived Factor-1 생성의 조절

조덕연,황진희,정효균,박수진,박상은,곽승근,윤환중,성주명,김삼용 大韓血液學會 2003 大韓血液學會誌 Vol.38 No.2

한국 기업의 자본구조 결정에 대한 목표조정모형에 관한 연구

추연욱(Chu Yeon Uk),윤상용(Yun Sang yong),구본일(Gu Bon Il) 연세대학교 경영연구소 2012 연세경영연구 Vol.49 No.2

기업의 자본조달 수단은 부채와 자기자본이다. 기업이 필요한 자본을 조달할 때 이 둘 사이에서 어떤 선택을 하는가에 대한 가설은 크게 둘로 나뉘는데, 기업가치를 극대화하는 최적자본지율을 달성하고자 한다는 절충이론(trade-off theory)과 편의와 비용에 따라 선택한다는 순서이론(pecking order theory)이다. 이 분야의 많은 연구들이 두 가설들 간의 우열을 판별하려고 시도했으나, 결과는 두 모형 모두 일정한 설명력이 있다는 것으로 귀결되고 있다. 오늘날의 연구는 기업이 목표부채비율과 실제부채비율 간의 차이를 점차적으로 축소해 가는 동태적 과정을 조정속도의 관점에서 추정하는 것에도 관심이 맞추어져 있다. 본 논문은 목표부채비율의 선정에 대한 다양한 대안들을 제시하면서, 어떤 목표부채비율모형이 동태적 조정모형의 설명력을 높이는 바람직한 대안인지 검증하였다. 실증 결과 한국 기업들의 자본구조는 순서이론보다는 절충이론에 의해서 보다 잘 설명된다는 기존의 연구들과 일치하였다. 동태적 조정모형에 대한 검증에서는 산업평균 부채비율을 개별기업의 목표부채비율로 설정한 모형의 설명력이 가장 높아서 기업들이 산업평균 부채비율을 의식한 자본구조 조정을 수행하는 것으로 해석할 수 있다. 이러한 현상은 외환위기를 넘긴 1998년 이후 재벌진단에 속하지 않은 기업들에서 가장 확실하게 관찰된다. Debt and Equity are the two major sources of capital for corporations. Accordingly, there are two hypotheses on how firms made their decisions on the choice between these funding sources. Trade-off theory assumes that firms have value maximizing optimal capital structures, and their choice between the two sources should reflect on the effort to achieve that capital structure. In contrast, the other theory claims that there is no such an optimal capital structure, and firms merely consider the level of convenience or commissions to pay on each source. Most previous works tried to give verdict to the superiority of one over the other, but the study found that both theories have some relevance in explaining the funding behaviors of corporations. Current research has been focused on how firms adjust the gap between the target capital structure and the real capital structure. This paper suggests three different models as a target, and finds that industry average model works the best in explaining firms" capital structure adjusting behavior. This observation is most prominent post in 1997 foreign currency crisis period and among those not affiliated with conglomerates called chaebul in Korea.

조혈세포에 대한 조혈성장인자의 단기간 처리가 CXCR4 발현 및 Stromal Cell-Derived Factor-1 (SDF-1) 매개 경내피세포 이동에 미치는 영향

조덕연,황진희,곽승근,신현영,김성은,윤환중,성주명,김삼용 大韓血液學會 2001 大韓血液學會誌 Vol.36 No.4

Depositional Processes of Fine-Grained Sediments and Foraminiferal Imprint of Estuarine Circulation by Summer Floods in Yoja Bay, Southern Coast of Korea

Lee, Yeon-Gyu,Jung, Kyu-Kui,Woo, Han-Jun,Chu, Yong-Shik The Korean Society of Oceanography 2000 Journal of the Korean Society of Oceanography Vol.35 No.2

Depositional processes of fine-grained sediments were investigated on the basis of sediment transport vector analysis and identification of benthic foraminiferal assemblages in Yoja Bay, southern coast of Korea. The bay is a semi-enclosed embayment where extensive mud flats occur with a width up to about 4 km. Most surface sediments are poorly sorted (sorting values: 1.9-3.0 ${\phi}$) mud and silt (mean grain size: 6.0-8.7 ${\phi}$), except for the tidal inlets with basement rocks locally exposed. Grain-size distribution shows a fining tendency toward the basin center near the Yoja Island, implying a possible existence of turbidity maximum and relatively rapid settling of fine-grained sediments. The agglutinated foraminiferal taxa are dominant in the inner bay and decrease in abundance toward the mouth of the bay. Species diversities are higher in the outer bay, due to mixing of the offshore faunas with those of the bay. Four groups of benthic foraminiferal assemblages, identified by cluster analysis, represent the bay. Biofacies I and ll with relatively lower diversities are dominated by Ammobaculites exiguus and Ammonia beccarii, suggestive of influx of fresh water. In contrast, biofacies III and IV with relatively higher diversities include increased amounts of calcareous genus Elphidium and Quinquelocuzina, accounting for strong influence of sea water from the offshore. The fluvial discharge in summer floods appears to develop a bay-wide, clockwise lateral circulation in Yoja Bay, a typical of well-mixed estuaries. Accordingly, the foraminiferal assemblages of the surface sediments well show a sign of this circulation. The dominant inflow of the offshore water into the western part of the bay has resulted in more extensive muddy tidal flats compared to the eastern narrower counterpart.

블록체인 브릿지 기술을 활용한 가상 발전소 간 전력시스템 최적 운영 방안

추연욱(Yeon-Ouk Chu),송영국(Young-Kook Song),오재영(Jae-Young Oh),윤용태(Yong-Tae Yoon) 대한전기학회 2024 대한전기학회 학술대회 논문집 Vol.2024 No.7

요추 추간판 탈출증 환자의 한의치료 후 디스크 흡수율 비교 및 흡수에 영향을 주는 요인 분석 연구

김용현 ( Yong-hyeon Kim ),이주영 ( Ju-young Lee ),김광휘 ( Kwang-hwi Kim ),김태연 ( Tae-yeon Kim ),이태걸 ( Tae-geol Lee ),이상운 ( Sang-woon Lee ),추희영 ( Hui-yeong Chu ),정희경 ( Hui-gyeong Jeong ) 한방재활의학과학회 2018 한방재활의학과학회지 Vol.28 No.4

Objectives The purpose of this study is to analyze the effects of Korean Medicine treatment on lumbar disc herniation (LDH) and predictive factors associated with disc resorption by magnetic resonance imaging (MRI). Methods A retrospective study was carried out in 79 lumbar disc herniation patients who had visited Haeundae Jaseng Hospital of Korean Medicine. Patients' diagnosis was based on MRI. MRI was performed on two or more occasions and patients were received Korean Medicine treatment within the period. The volume of each herniated disc was measured three-dimensionally and patient characteristics, interval between MRIs, herniated disc level, disc herniation type, disc migration, intactness of posterior longitudinal ligament (PLL), initial volume of herniated disc, modic change, disc resorption rate were statistically analyzed. Results The mean volumes of herniated discs before Korean Medicine treatment and after Korean Medicine treatment were 1,547.81±598.15 mm3 and 947.06±335.28 mm3, respectively. The mean resorption rate was 35.7±16.3%. Disc extent, intactness of PLL and initial volume of herniated discs were significantly correlated with resorption rate (p=0.003, p=0.001 and p=0.024, respectively). Conclusions Korean Medicine treatment is an effective conservative treatment for lumbar disc herniation. Factors such as disc migration, intactness of PLL, initial volume of herniated disc have a significant association with disc resorption rate. (J Korean Med Rehabil 2018;28(4):33-41)