• Title/Summary/Keyword: head formation

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Long-Term Experiences of the Provox Voice Prosthesis at Snuh (서울대학교병원에서의 Provox 장기간 사용경험)

  • Jung, Young-Ho;Park, Jun-Beom;Won, Tae-Bin;Lee, Seung-Shin;Mo, Ji-Hun;Park, Seok-Won;Sung, Myung-Whun;Kim, Kwang-Hyun
    • Korean Journal of Bronchoesophagology
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    • v.5 no.2
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    • pp.130-137
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    • 1999
  • Background and Objectives : Provox, a recently developed tracheoesophageal prosthesis, had been widely used for voice rehabilitation after total laryngectomy for its low resistance and easiness of speech ability. But, long-term use of Provox resulted in many complications and resulted in cessation of Provox as a primary method of vocal rehabilitation. The aim of this study is to report Provox-related problems and the long-term results of Provox voice prosthesis. Materials and Methods : Medical records from patients who had undergone total laryngectomy with Provox insertion at seoul National University Hospital between January 1993 and December 1998 were reviewed retrospectively. Results : 36 patients had used 79 Provox voice prostheses during the observed period. The most common complication causing prosthesis change or removal was leakage and/or aspiration, followed by granulation formation, crusting and/or obstruction, and non-function. Median in situ lifetime of Provox was 274 days and 1-year-in situ rate was 31.0% Among 36 patients, 17 patients had undergone tracheoesophageal shunt closure at the last follow-up visit. 10 patients had complications but got along without further treatments, and 1 patient changed to Blom-Singer voice prosthesis. Only 8 patients experienced no complication, and 5 out of whom had several times of Provox change. Conclusion : long-term use of Provox resulted in discontinuation of its use due to complications in many cases. A better voice prosthesis with lower complication rate and longer in situ lifetime is needed.

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Treatment Results of Tonsil Cancer : Comparison of Extended Tonsillectomy with Composite Resection (편도암의 수술적용 형태에 따른 치료효과 - 광범위 편도절제술과 복합 편도절제술의 비교 -)

  • Chu Hyung-Ro;Han Seung-Hoon;Kwon Kee-Hwan;Jung Kwang-Yoon;Choi Geon;Choi Jong-Ouck
    • Korean Journal of Head & Neck Oncology
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    • v.15 no.1
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    • pp.35-39
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    • 1999
  • Objectives: The treatment for squamous cell carcinoma of the tonsil remains controversial. Surgery or radiation therapy alone is effective in treating early tonsil cancer, but results with single treatment modality in advanced disease have been disappointing. We retrospectively analyzed 37 patients with advanced squamous cell carcinoma of the tonsil for two treatment modalities in an effort to identify more efficacious therapeutic options. Materials and Methods: From 1990 through 1997, 37 patients who were treated primarily with surgery, were retrospectively sudied. The patients were grouped into two groups according to the method of treatment, extended tonsillectomy followed by irradiation and/or postradiation neck dissection(Group I) and a combination of composite resection and postoperative radiation(Group II). Results: The three year disease-tree survival in patients with stage IV lesions was 59.09% for the Group I patients, and 56.25% for the Group II patients. This difference was not statistically significant(p=0.775). The primary tumor recurrence rate in Group I was 16.7% in contrast to 23.1% for Group II. The local recurrence rate in the neck was 16.7% for the Group I patients and 23.1% for the Group II patients. There was no significant difference in the frequency of recurrences in the primary or neck in the patients treated with extended tonsillectomy or composite resection(p=0.639). Fistula formation and aspiration occurred in four patients after composite resection. Additionally, there were three trismus, one soft tissue necrosis, and one velopharyngeal insufficiency. Major complications were not observed in the patients treated with extended tonsillectomy and irradiation: velopharyngeal insufficiency was observed in eight patients and soft tissue necrosis in two patients. Conclusion: Extended tonsillectomy followed by irradiation may be an effective therapy with low morbidity in selected patients with tonsil cancer.

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Retrograde Analysis of Complications of Jejunal Free Flap after Total Pharyngo-Laryngo-Cervical Esophagectomy in Advanced Hypopharyngeal Cancer Treatment (하인두암에서 후두인두 및 경부 식도 전 적출술 후 유리 공장 이식술의 합병증에 대한 후향적 분석)

  • Min, Hyun-Jin;Hyun, Dong-Woo;Kim, Young-Ho;Choi, Eun-Chang;Kim, Kwang-Moon;Kim, Se-Heon
    • Korean Journal of Head & Neck Oncology
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    • v.24 no.1
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    • pp.43-46
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    • 2008
  • Hypophayngeal cancers are usually diagnosed in advanced stages and in many cases, they need total pharyngocervical esophagectomy and surgical reconstruction. Among many surgical reconstructive methods, jejunal free flap has anatomical and functional advantages such as tubed nature, peristaltic activity, excellent blood supply. In this study we analysed the surgical procedure and complications of jejunal free flap after total pharyngo-cervical esophagectomy. 20 cases performed jejunal free flap from 1995 to 2007 at Severance Hospital were reviewed. According to time of onset, early and late complications were reviewed. Surgical procedure was reviewed with operation record. Oral diet tolerance was reviewed on the basis of pharyngogram and subjective symptoms. The most common complication was stricture, and it occurred in 40% of cases and 63% of them were managed with conservative care. As early complication, fistula formation was all managed with conservative care. Oral feeding tolerance after jejunal free flap was 65% and 7 patients were tolerable to general diet. In our study, stricture was the most common complication and its management is important in post op oral diet tolerance.

The Study About Formation-Process Of religious Dress And It's Ornament(I)-Forcusing On Ancient Egypt- (종교복식의 형성 과정에 관한 연구(I)-고대 이집트를 중심으로-)

  • 임상임;김현경
    • Journal of the Korean Society of Costume
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    • v.39
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    • pp.21-37
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    • 1998
  • This study researchs forms of Egyptian religious dress for studying formation-process of religious dress and its ornament. The study goes abreast literature and the very spot's materials also divides god's dress, priest's. Ancient an egytian worshiped mainly animals, step by step animal's humanization. So gods were expressed animal's face and human's body. Egypt god's costume is 1st, to take off upper hament and wear loin cloth on trousers 2nd only to wear short sheath skirt. 3rd to wear shout sheath skirt and to skirt and to wear loin cloth on there 4th to cover whole body and to open hand like mummy. Egype goddess' costume is largely to wear long sheath skirt up to the ankle and we can see selkit goddess's figure that wearing kalasiris after new dynesty. Priest had been a bald head and worn loin cloth and surrounded leopard's skin on there, but after the period of empire, worn a wig and worn less stoically. Also god had hung the lion's tail at symbol of the dignity and priest had put on sandals for a ceremony.

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Osteoma of the Frontal Sinus with Secondary Subdural Empyema Formation

  • Cho, Sung-Yun;Kim, Jeong-Whun;Kim, Chae-Yong
    • Journal of Korean Neurosurgical Society
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    • v.40 no.3
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    • pp.202-205
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    • 2006
  • Osteomas of the paranasal sinuses rarely lead to intracranial manifestations. The authors report an unusual case of a frontal sinus osteoma leading to subdural emyema formation. A 19-year-old man presented with headache and fever one month after minor facial trauma. Neuroradiological studies revealed subdural empyema in left frontal lobe with moderate cerebral edema and a osteoma in the left frontal sinus with sinusitis of maxillary sinus. The patient was surgically treated in one stage operation of decompressive craniectomy, removal of subdural empyema with frontal sinus osteoma, and endoscopic sinus surgery via cranial and nasal route. The patient recovered very well after surgery and postoperative antibiotic therapy. The etiology of intracranial infection and the treatment strategy are to be discussed.

Numerical Study on the Formation of Tumble Motion in Engine Cylinder (엔진내부 텀블 유동 형성에 대한 수치해석적 연구)

  • Lee, Byoung-Seo;Lee, Joon-Sik;Yoo, Jung-Yul
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.2233-2238
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    • 2003
  • It is well known that organized vortex rotations swirl and tumble greatly affect the mixing, the combustion and heat transfer processes in engine cylinder. We have developed 3 dimensional numerical simulation codes whose predictions make good agreement with the experimental data. Large eddy simulation based on Smagorinsky subgrid scale model was adopted to describe the turbulence of in-cylinder flows. The tumble motions generated by different inclination angles between valve-port and cylinder head have been calculated. The results show that the angles between direction of induced flow and cylinder walls which the flow collides with play a great role in the formation and generation of tumble motions. Therefore, it is inferred that seat angle and inclination angle are important factors of engine design. In addition, the numerical results of different engine speed -1000 rpm and 3000 rpm are very similar in the flow structure.

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A Study on the Kernel Formation & Development for Lean Burn and EGR Engine (희박연소 및 EGR 엔진에서 초기 화염액 생성 및 성장에 관한 연구)

  • 송정훈;선우명호
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.8
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    • pp.24-33
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    • 1999
  • This paper investigate the effects of the variations of engine operation condition in the flame kernel formation and developmnet . A model for calculating the initial kernel development in spark ignition engines is formualted. It considered input of electrical energy, combustion energy release and heat transfer to the spark plyg, cylinder head, and unburned mixture. The model also takes into accounts strain rate of initial kernel and residual gas fraction. The breakdown process and the subsequent electrical power input initially control the kernel growth while intermediate growth is mainly dominated by diffusion or conduction. Then, the flame propagates by the chemical energy and turbulent flame expansion. Flame kernel development also influenced by engine operating conditions, for example, EGR rate, air-fuel ration and intake manifold pressure.

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Studies on the Formation and Stability of Colloids (I): Perturbation of Micelle Formation of Sodium Deoxycholate by Amides

  • Park, Joon-Woo;Chung He-Sson
    • Bulletin of the Korean Chemical Society
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    • v.7 no.5
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    • pp.399-402
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    • 1986
  • The critical micelle concentration (CMC) of sodium deoxycholate (NaDC) and the effects of amides on the micellization processes have been studied by fluorometric technique using pyrene as a probe. The addition of amides as cosolvent destabilized the NaDC micelle and increased the CMC. The order of effectiveness for the perturbation of NaDC micelle was N-methylacetamide ${\ge}$ DMF > acetamide > formamide, which is the order of hydrophobicity of the amines. This indicated that the effect of amides on the micellization processes of NaDC arises from diminution of the hydrophobic effect. The electrostatic repulsion between ionic head groups in the NaDC micelle appeared to be much less than that in aliphatic ionic micelle. This was also revealed in the weaker dependence of the CMC on ionic strength. The premicellar association of NaDC was not significantly involved in the micellization processes of the bile salt.

An Analysis of Threshold-sensitive Variable Area Clustering protocol in Wireless Sensor Networks (무선 센서 네트워크 환경의 Threshold-sensitive 가변 영역 클러스터링 프로토콜에 관한 분석)

  • Choi, Dang-Min;Moh, Sang-Man;Chung, Il-Yang
    • Journal of Korea Multimedia Society
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    • v.12 no.11
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    • pp.1609-1622
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    • 2009
  • In wireless sensor networks, a clustering protocol is an efficient method to prolong network lifetime. In general, it results in more energy consumption at the cluster-head node. Hence, such a protocol must changes the cluster formation and cluster-head node in each round to prolong the network lifetime. But, this method also causes large amount of energy consumption during the set-up process of cluster formation. In order to improve energy efficiency, in this paper, we propose a new clustering algorithm. In this algorithm, we exclude duplicated data of adjacent nodes and transmits the threshold value. We define a group as the sensor nodes within close proximity of each other. In a group, a node senses and transmits data at a time on the round-robin basis. In a view of whole network, group is treated as one node. During the setup phase of a round, intra clusters are formed first and then they are re-clustered(network cluster) by choosing cluster-heads(group). In the group with a cluster-head, every member node plays the role of cluster-head on the round-robin basis. Hence, we can lengthen periodic round by a factor of group size. As a result of analysis and comparison, our scheme reduces energy consumption of nodes, and improve the efficiency of communications in sensor networks compared with current clustering methods.

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Developmental Patterns of Glandular Trichomes in Leaves of Vitex negundo (좀목형 엽육 표피조직의 분비모 발달 양상)

  • Park, Jae-Yong;Kim, In-Sun
    • Applied Microscopy
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    • v.40 no.2
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    • pp.101-108
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    • 2010
  • Vitex negundo is an aromatic plant which releases a unique scent due to the presence of essential oil stored presumably within glandular trichomes. The focus of this research was to study developmental patterns of glandular trichomes in Vitex negundo leaves using electron microscopy. There are two types of glandular trichomes which develop on the leaf epidermis of Vitex negundo, peltate glandular type (PT) and capitate glandular type (CT). Structural features differ significantly depending on size and density, formation of secretory cavity, plastid, etc during developmental stages. In young leaves, undifferentiated PTs are densely distributed in the upper epidermis, but are not externally exposed in the lower epidermis because they are covered by non-glandular simple trichomes. Upon leaf development, PTs and CTs show clear structural differentiation in the upper and lower epidermis. PTs are composed of up to eight head cells (ca. 35~40 ${\mu}m$) and one stalk cell (ca. 5 ${\mu}m$), while CTs are composed of four head cells (ca. 10~15 ${\mu}m$) and 1~2 stalk cells (ca. 10 ${\mu}m$). Although secretory cavities develop on the secretory head cells, their size, structure, and formation proceed very differently depending on trichome type. In early development of PT, a large cavity with numerous secretory vesicles form rapidly from the head cells. In CT, however, only a small secretory cavity is formed, slowly relative to PT, without secretory vesicles. The PTs are considered to play an important role in releasing the aromatic components of Vitex negundo.