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Leem, Dae-Ho,Choi, Kyeong-Hee,Han, Hye-Suk,Kim, Jun-Hee,Shin, Ji-Ae,Choi, Eun-Sun,Shim, Jung-Hyun,Kong, Gu,Min, Yong-Ki,Nam, Jeong-Seok,Oh, Seung Hyun,Kim, Kyoung-A,Kwon, Ki Han,Cho, Nam-Pyo,Cho, Sung Lippincott Williams Wilkins, Inc. 2010 EUROPEAN JOURNAL OF CANCER PREVENTION Vol.19 No.1
In a previous study, we demonstrated that cyclooxygenase-2 (COX-2) is overexpressed in Korean patients having oral cancer. The goal of this study was to study whether KO-202125 (KO), a sauristolactam derivative in KB human oral squamous carcinoma cells, inhibits the activity of COX-2 enzyme and induces apoptotic cell death. In this study, it was shown that KO inhibited COX-2 mRNA and protein and its catalytic activity (prostaglandin E2), but not COX-1. The antiproliferative effect of KO on KB cells was also examined. The results showed that KO significantly decreased the number of viable cells and showed morphological changes in a concentration-dependent manner. The decrease in cell number was associated with apoptotic cell death evidenced by cleaved poly ADP ribose polymerase (PARP), nuclear fragmentation, sub-G1 population and annexin V positivity. Interestingly, KO is more potent than celecoxib, which is a well-known selective COX-2 inhibitor, although more studies are needed to prove it. Altogether, these results show that KO can act as a potent antioral cancer drug candidate by regulating COX-2 activity.
A ramus cortical bone harvesting technique without bone marrow invasion
Jeong-Kui Ku(Jeong-Kui Ku),Min-Soo Ghim(Min-Soo Ghim),Jung Ho Park(Jung Ho Park),Dae Ho Leem(Dae Ho Leem) 대한구강악안면외과학회 2023 대한구강악안면외과학회지 Vol.49 No.2
Autogenous bone grafts from the mandibular ramus are a known source of inadequate bone volume scenarios of the residual alveolar ridge. However, the conventional block-type harvesting technique cannot prevent bone marrow invasion, which can cause postoperative complications such as pain, swelling, and inferior alveolar nerve injury. This study aims to suggest a complication-free harvesting technique and present the results of bone grafting and donor sites. One patient received two dental implants with a complication-free harvesting technique that involves creation of ditching holes with a 1 mm round bur. Sagittal, coronal, and axial osteotomies produced grid-type cortical squares using a micro-saw and a round bur to confirm the cortical thickness. The grid-type cortical bone was harvested from the occlusal aspect, and the harvesting was extended through an additional osteotomy on the exposed and remaining cortical bone to prevent bone marrow invasion. The patient did not suffer postoperative severe pain, swelling, or numbness. After 15 months, the harvested site exhibited new cortical bone lining, and the grafted area had healed to a cortico-cancellous complex with functional loading of the implants. Our technique, grid-type cortical bone harvesting without bone marrow invasion, allowed application of autogenous bone without bone marrow invasion to achieve acceptable bone healing of the dental implants and to regenerate the harvested cortical bone.
신대한(Dae Han Shin),임상혁(Sang Huyck Leem),안다운(Dawn An),최주호(Joo-Ho Choi) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this study, crack growth in a center-cracked plate is predicted under mode I variable amplitude loading, and the result is validated by experiment. In this paper to focus airplane experiment the typical loading spectrum on the plane fuselage for the effective crack growth. The Huang’s model is employed to describe crack growth with acceleration and retardation due to the variable loading effect. Experiment is conducted with Al6061-T6 plate considered plane fuselage, in which the load is applied, and crack length is measured periodically. Particle Filter algorithm, which is based on the Bayesian approach, is used to estimate model parameters from the experimental data, and predict the crack growth of the future in the probabilistic way. The prediction is validated by the run-to-failure results, from which it is observed that the method predicts well the unique behavior of crack growth and the more data are used, the closer prediction we get to the actual run-to-failure data.
사과의 결과지 길이와 꽃눈 위치에 따른 개화 및 과실 특성
김호철(Ho Cheol Kim),홍대인(Dae In Hong),배종향(Jong Hyang Bae),임규(Kyu Leem),김태춘(Tae-Choon Kim) (사)한국생물환경조절학회 2007 시설원예‧식물공장 Vol.16 No.3
국내 육성 품종인 3년생 ‘홍로’와 도입 품종인 4년생 ‘갤럭시갈라’ 사과를 대상으로 정아 고사 시 장과지 및 액아의 활용 가치를 알아보고자 결과지 길이 및 꽃눈 위치 따른 개화 및 과실 특성을 조사하였다. ‘홍로’와 ‘갤럭시갈라’ 모두 개화시, 만개기 및 낙화기는 20 ㎝ 이상 결과지에서 5 ㎝ 미난과 10~15 ㎝ 결과지보다 다소 늦었다. 화총당 꽃수도 1개 정도 적었다. 과중, 종자수, 당산비 등 대부분의 과실 특성은 5 ㎝ 미만과 10~15 ㎝ 결과지에서 20 ㎝ 이상 높았지만, 당도와 산 함량은 반대의 경향이었다. 20 ㎝ 이상 결과지의 정아와 액아 간 대부분의 과실 특성은 액아에서 좋은 경향을 나타내었지만, ‘홍로’ 사과의 종자수, ‘갤러시갈라’의 Hunter a값을 제외하고는 유의한 차이를 나타내지 않았다. 그리고 두 품종 모두 과중과 종자 간 높은 상관성을 나타내었다. 따라서 정아 고사 시 장과지로 대체 활용할 수 있고 ‘갤럭시갈라’의 경우 액화아의 이용도 가능하였다. Flower and fruit characteristics, in ‘Hongro’ and ‘Galaxy Gala’ apples, were investigated by bearing branch lengths and flower bud position such as blow 5 ㎝, 10~15 ㎝ and above 20 ㎝ length with terminal bud, and above 20 ㎝ length with axillary bud for investigation on possibility of alternative use of long bearing branch and axillary bud in case of die-back of spur flower bud. In flowering characteristics by flower bud position in the above 20 ㎝ length, the terminal bud was later and was short in flowering period, and also was little in number of flower per bud. Fruit weight, number of seeds, and sugar-acid ratio, in characteristics of ripening fruit, were more the blow 5 ㎝ and 10~15 ㎝ length, but soluble solid and malic acid contents was the opposite tendency. In fruit characteristics by flower bud position in the above 20 ㎝ length, the terminal bud had high tendency expected for number of seed in ‘Hongro’ and Hunter a value of ‘Galaxy Gala’ apple but had not significant difference. Correlation between fruit weight and number of seed was high. As the results, value of alternative use of long bearing branch in apples had a little expected for fruit weight, especially was more ‘Galaxy Gala’ and the axillary bud.
Verrucous carcinoma arising from a previous cystic lesion: a case report
Kang, Sunghyun,Leem, Dae Ho Korean Association of Maxillofacial Plastic and Re 2018 Maxillofacial Plastic Reconstructive Surgery Vol.40 No.-
Background: Verrucous carcinoma (VC) accounts for 1-10% of cases of squamous cell carcinoma (SCC) in the oral cavity, and 75% of VC occur in the oral cavity. Only 3% of primary intraosseous squamous cell carcinomas (PIOSCC), which means SCC occurring primarily in the bone, are VC. Verrucous carcinoma arising from odontogenic cysts (OC) is very rare, with only seven cases reported to date. Case presentation: This study reported a case of a patient who underwent partial maxillectomy and neck dissection for VC that occurred in the right anterior maxilla. The patient was admitted to the emergency department at our institution 8 years ago and showed cystic lesions in the anterior maxilla on facial computed tomography (CT) images. Treatment through other departments including assessment of laceration in the mental region and only suture was performed. This report highlights a very rare case of VC in the right anterior maxilla arising from a previous cystic lesion. Conclusions: Since PIOSCC can arise from OC, appropriate treatment of intraosseous cysts and regular radiologic evaluation are necesssary. Surgical exicision of the primary lesion without neck dissection can lead to good prognosis for patients with primary intraosseous verrucous carcinoma.